Variable Decoder Patents (Class 381/22)
  • Publication number: 20120207311
    Abstract: A parametric coding method and apparatus are provided for coding a multichannel digital audio signal. The method includes a coding step for coding a signal from a channel reduction matrixing of the multichannel signal. The coding method also includes: obtaining, for each frame of predetermined length, spatial information parameters of the multichannel signal; dividing the spatial information parameters into a plurality of blocks of parameters; selecting a block of parameters as a function of the index of the current frame; and coding the block of parameters selected for the current frame.
    Type: Application
    Filed: October 15, 2010
    Publication date: August 16, 2012
    Applicant: FRANCE TELECOM
    Inventors: Thi Minh Nguyet Hoang, Stephane Ragot, Balazs Kovesi
  • Patent number: 8243936
    Abstract: The present invention provides improvements to prior art audio codecs that generate a stereo-illusion through post-processing of a received mono signal. These improvements are accomplished by extraction of stereo-image describing parameters at the encoder side, which are transmitted and subsequently used for control of a stereo generator at the decoder side. Furthermore, the invention bridges the gap between simple pseudo-stereo methods, and current methods of true stereo-coding, by using a new form of parametric stereo coding. A stereo-balance parameter is introduced, which enables more advanced stereo modes, and in addition forms the basis of a new method of stereo-coding of spectral envelopes, of particular use in systems where guided HFR (High Frequency Reconstruction) is employed. As a special case, the application of this stereo-coding scheme in scalable HFR-based codecs is described.
    Type: Grant
    Filed: October 30, 2009
    Date of Patent: August 14, 2012
    Assignee: Dolby International AB
    Inventors: Fredrik Henn, Kristofer Kjorling, Lars Liljeryd, Jonas Roden, Jonas Engdegard
  • Publication number: 20120201388
    Abstract: Provided is a method for controlling synchronizing downmix signals and MPEG surround side information signals by controlling a delay according to the kind of downmix audio signals in an MPEG surround decoder. When multi-channel audio signals are restored using an HE-AAC decoder and a low-power MPEG surround decoder and complex QMF signals outputted from the HE-AAC decoder are used as downmix signals, a delay unit compensates for a delay caused in a real-to-complex converter. Anther delay unit delays spatial parameters to compensate for a delay caused in QMF and Nyquist banks when time-domain downmix signals are used. Also, when multi-channel audio signals are restored using an HE-AAC decoder and a high-quality MPEG surround decoder and complex QMF signals outputted from the HE-AAC decoder are used as downmix signals, a delay unit compensates for a delay caused in a real-to-complex converter.
    Type: Application
    Filed: April 18, 2012
    Publication date: August 9, 2012
    Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Jeong-Il SEO, Seung-Kwon BEACK, In-Seon JANG, Dae-Young JANG, Jin-Woo HONG, Jin-Woong KIM
  • Patent number: 8238561
    Abstract: Methods and apparatuses for encoding and decoding a multi-channel audio signal are provided. In the encoding method, spatial information that is calculated based on a multi-channel audio signal and a downmix signal is encoded, and additional configuration information is generated based on information that is selected from the encoded spatial information. The downmix signal is encoded, and then, a bitstream is generated by combining the encoded downmix signal with the encoded spatial information. Thereafter, the additional configuration information is inserted into the bitstream. Therefore, it is possible to configure an optimum bitstream according to the circumstances by retransmitting all or part of information included in a header.
    Type: Grant
    Filed: October 20, 2006
    Date of Patent: August 7, 2012
    Assignee: LG Electronics Inc.
    Inventors: Yang-Won Jung, Hee Suk Pang, Hyen-O Oh, Dong Soo Kim, Jae Hyun Lim
  • Publication number: 20120189127
    Abstract: A stereo decoding method and apparatus are disclosed. The method includes: restoring a monophonic signal from a received code stream through decoding; restoring an interchannel level difference, a group delay, and a group phase from the received code stream through decoding; and processing the monophonic signal according to the interchannel level difference, group delay, and group phase to obtain a first channel signal and a second channel signal. According to the stereo decoding method and apparatus provided in embodiments of the present invention, the first and second channel signals are obtained according to the monophonic signal, ILD, group delay, and group phase by referring to not only the ILD but also the group delay and group phase, thereby yielding favorable stereo sound field effect for the obtained first and second channel signals.
    Type: Application
    Filed: April 2, 2012
    Publication date: July 26, 2012
    Applicant: Huawei Technologies Co., Ltd.
    Inventors: Wenhai WU, Lei MIAO, Yue LANG, Qi ZHANG
  • Publication number: 20120183148
    Abstract: A multichannel multitrack audio system and an audio processing method are provided. The audio processing method down-mixes and encodes a first audio object constituting the audio from multiple channels to a lower number of channels. Thus, the method for down-mixing audio objects of the audio from the multichannel to the lower number of channels generates the multichannel multi-object audio and reproduces the generated multichannel multi-object audio. Abrupt data increase can be addressed in processing the multichannel multi-object audio.
    Type: Application
    Filed: December 29, 2011
    Publication date: July 19, 2012
    Applicant: KOREA ELECTRONICS TECHNOLOGY INSTITUTE
    Inventors: Choong Sang CHO, Je Woo KIM, Byeong Ho CHOI, Hwa Seon SHIN
  • Publication number: 20120177204
    Abstract: An audio signal decoder for providing an upmix signal representation in dependence on a downmix signal representation and an object-related parametric information includes an object separator configured to decompose the downmix signal representation, to provide a first audio information describing a first set of one or more audio objects of a first audio object type and a second audio information describing a second set of one or more audio objects of a second audio object type, in dependence on the downmix signal representation and using at least a part of the object-related parametric information.
    Type: Application
    Filed: December 22, 2011
    Publication date: July 12, 2012
    Inventors: Oliver Hellmuth, Cornelia Falch, Juergen Herre, Johannes Hilpert, Leon Terentiv, Falko Ridderbusch
  • Patent number: 8213641
    Abstract: One or more attributes (e.g., pan, gain, etc.) associated with one or more objects (e.g., an instrument) of a stereo or multi-channel audio signal can be modified to provide remix capability. In some implementations, a method can include obtaining a first plural-channel audio signal having one or more objects; obtaining side information, at least some of which represents a relation between the first plural-channel audio signal and the one or more objects; obtaining a set of mix parameters; and generating a second plural-channel audio signal using the side information and the set of mix parameters.
    Type: Grant
    Filed: May 3, 2007
    Date of Patent: July 3, 2012
    Assignee: LG Electronics Inc.
    Inventors: Christof Faller, Hyen O. Oh, Yang Won Jung
  • Publication number: 20120163607
    Abstract: A decoder and decoding method for use in surround sound system wherein at least four audio input signals representing an original sound field are encoded into two channel signals and said encoded signals are decoded into at least four audio output signals corresponding to the four audio input signals and have an amplitude ratio and a phase relationship. The decoder and method including means for: compensating the said encoded signals for variations in perceived loudness relative to frequency associated with the encoded two channel signals due to non linearity in human hearing response at least at some frequencies; producing steering signals in responsive to the phase relationship of the said compensated signals; decoding said encoded signals to produce audio output signals corresponding to audio input signals by varying at least the amplitude ratio of said encoded signals contained in each of the output signals in response to said steering signals.
    Type: Application
    Filed: December 9, 2010
    Publication date: June 28, 2012
    Applicant: Reality IP PTY LTD
    Inventor: Charlie Corneles Van Dongen
  • Publication number: 20120163606
    Abstract: An apparatus (300) comprises—one or more inputs (IN1, IN2) to receive two or more different audio signals (S1, S2),—an input (IN—VDI1) to receive a direction signal (SVDI1) and—a signal processing unit (100) arranged to generate a processed audio signal (SAUDIOI) from said two or more different audio signals (S1, S2), said processed audio signal (SAUDIO1) comprising an enhanced audio signal (SENC1) corresponding to a sound (SND2) originating from a location (x2y2) indicated by said direction signal (SVDI1).
    Type: Application
    Filed: June 23, 2009
    Publication date: June 28, 2012
    Applicant: NOKIA CORPORATION
    Inventors: Antti Eronen, Pasi Ojala
  • Patent number: 8208640
    Abstract: An audio multi-standard detection apparatus is provided to pre-record a plurality of audio broadcasting format carrier bands. The detection apparatus includes: a carrier calculation unit and a switch controller. The carrier calculation unit is used for receiving an intermediate frequency signal and calculates the first carrier energy of the intermediate frequency signal in each of the frequency bands. From this first carrier energy, the switch controller determines which frequency bands are existed in the intermediate frequency signal, then analyzes the signal via at least one threshold value to determine the frequency band's primary carrier. The switch controller obtains an effective carrier. Further, the switch controller compares the effective carrier with the pre-recorded carrier bands for selectively outputting the appropriate audio broadcasting format.
    Type: Grant
    Filed: July 29, 2008
    Date of Patent: June 26, 2012
    Assignee: Realtek Semiconductor Corp.
    Inventors: Shan-Ting Hong, Yi-Chang Tu, Ching-Hsien Liao, Show-Hong Chen, Ying-Chuan Peng
  • Patent number: 8208641
    Abstract: An apparatus for processing a media signal and method thereof are disclosed, by which the media signal can be converted to a surround signal by using spatial information of the media signal. The present invention provides a method of processing a signal, the method comprising of extracting spatial information and a downmix signal from a bitstream; and generating rendering information by using the spatial information and filter information having a surround effect, wherein the rendering information comprises first rendering information applied to one channel of the downmix signal extracted from the bitstream and then transmitted on the same channel and second rendering information applied to the channel and then transmitted on another channel.
    Type: Grant
    Filed: January 19, 2007
    Date of Patent: June 26, 2012
    Assignee: LG Electronics Inc.
    Inventors: Hyen-O Oh, Hee Suk Pang, Dong Soo Kim, Jae Hyun Lim, Yang-Won Jung
  • Publication number: 20120155653
    Abstract: Representations of spatial audio scenes using higher-order Ambisonics HOA technology typically require a large number of coefficients per time instant. This data rate is too high for most practical applications that require real-time transmission of audio signals. According to the invention, the compression is carried out in spatial domain instead of HOA domain. The (N+1)2 input HOA coefficients are transformed into (N+1)2 equivalent signals in spatial domain, and the resulting (N+1)2 time-domain signals are input to a bank of parallel perceptual codecs. At decoder side, the individual spatial-domain signals are decoded, and the spatial-domain coefficients are transformed back into HOA domain in order to recover the original HOA representation.
    Type: Application
    Filed: December 21, 2011
    Publication date: June 21, 2012
    Inventors: Peter Jax, Johann-Markus Batke, Johannes Boehm, Sven Kordon
  • Patent number: 8194861
    Abstract: For generating a parametric representation of a multi-channel signal especially suitable for low-bit rate applications, only the location of the maximum of the sound energy within a replay setup is encoded and transmitted using direction parameter information. For multi-channel reconstruction, the energy distribution of the output channels identified by the direction parameter information is controlled by the direction parameter information, while the energy distribution in the remaining ambience channels is not controlled by the direction parameter information.
    Type: Grant
    Filed: October 16, 2006
    Date of Patent: June 5, 2012
    Assignee: Dolby International AB
    Inventors: Fredrik Henn, Jonas Roeden
  • Patent number: 8194878
    Abstract: A system and method is described herein in which an audio source wirelessly transmits audio content to a first audio sink over one wireless link and to a second audio sink over another wireless link. The two audio sinks also exchange forward error correction (FEC) streams over a link between the two audio sinks, wherein the FEC streams are generated by FEC encoding the audio content received from the audio source. The audio sinks advantageously use the exchanged FEC information to synchronize the playback of the audio content as well as to improve the robustness of the wireless links with the audio source in a manner that does not consume additional bandwidth on those links.
    Type: Grant
    Filed: September 8, 2011
    Date of Patent: June 5, 2012
    Assignee: Broadcom Corporation
    Inventors: Laurent Pilati, Mickael Jougit
  • Publication number: 20120128162
    Abstract: A mixed lossless audio compression has application to a unified lossy and lossless audio compression scheme that combines lossy and lossless audio compression within a same audio signal. The mixed lossless compression codes a transition frame between lossy and lossless coding frames to produce seamless transitions. The mixed lossless coding performs a lapped transform and inverse lapped transform to produce an appropriately windowed and folded pseudo-time domain frame, which can then be losslessly coded. The mixed lossless coding also can be applied for frames that exhibit poor lossy compression performance.
    Type: Application
    Filed: January 30, 2012
    Publication date: May 24, 2012
    Applicant: Microsoft Corporation
    Inventors: Wei-Ge Chen, Chao He
  • Patent number: 8184817
    Abstract: Provided is a multi-channel acoustic signal processing device by which loads of arithmetic operations are reduced. The multi-channel acoustic signal processing device includes: a decorrelated signal generation unit, and a matrix operation unit and a third arithmetic unit. The decorrelated signal generation unit generates a decorrelated signal w? indicating a sound which includes a sound indicated by an input signal x and reverberation, by performing reverberation processing on the input signal x. The matrix operation unit and the third arithmetic unit generate audio signals of m channels, by performing arithmetic operation on the input signal x and the decorrelated signal w? generated by the decorrelated signal generation unit, using a matrix R3 which indicates distribution of a signal intensity level and distribution of reverberation.
    Type: Grant
    Filed: July 7, 2006
    Date of Patent: May 22, 2012
    Assignee: Panasonic Corporation
    Inventors: Yoshiaki Takagi, Kok Seng Chong, Takeshi Norimatsu, Shuji Miyasaka, Akihisa Kawamura, Kojiro Ono
  • Patent number: 8180061
    Abstract: The purpose of the invention is to bridge the gap between parametric multi-channel audio coding and matrixed-surround multi-channel coding by gradually improving the sound of an up-mix signal while raising the bit-rate consumed by the side-information starting from 0 up to the bit-rates of the parametric methods. More specifically, it provides a method of flexibly choosing an “operating point” somewhere between matrixed-surround (no side-information, limited audio quality) and fully parametric reconstruction (full side-information rate required, good quality). This operating point can be chosen dynamically (i.e. varying over time) and in response to the permissible side-information rate, as it is dictated by the individual application.
    Type: Grant
    Filed: July 19, 2006
    Date of Patent: May 15, 2012
    Assignees: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V., Agere System, Inc.
    Inventors: Johannes Hilpert, Christof Faller, Karsten Linzmeier, Ralph Sperschneider
  • Patent number: 8175280
    Abstract: A headphone down mix signal can be efficiently derived from a parametric down mix of a multi-channel signal, when modified HRTFs (head related transfer functions) are derived from HRTFs of a multi-channel signal using a level parameter having information on a level relation between two channels of the multi-channel signals such that a modified HRTF is stronger influenced by the HRTF of a channel having a higher level than by the HRTF of a channel having a lower level. Modified HRTFs are derived within the decoding process taking into account the relative strength of the channels associated to the HRTFs. The HRTFs are thus modified such that a down mix signal of a parametric representation of a multi-channel signal can directly be used to synthesize the headphone down mix signal without the need of an intermediate full parametric multi-channel reconstruction of the parametric down mix.
    Type: Grant
    Filed: September 1, 2006
    Date of Patent: May 8, 2012
    Assignee: Dolby International AB
    Inventors: Lars Villemoes, Kristofer Kjoerling, Jeroen Breebaart
  • Patent number: 8170885
    Abstract: Disclosed is a wideband audio signal coding/decoding device and method that may code a wideband audio signal while maintaining a low bit rate. The wideband audio signal coding device includes an enhancement layer that extracts a first spectrum parameter from an inputted wideband signal having a first bandwidth, quantizes the extracted first spectrum parameter, and converts the extracted first spectrum parameter into a second spectrum parameter; and a coding unit that extracts a narrowband signal from the inputted wideband signal and codes the narrowband signal based on the second spectrum parameter provided from the enhancement layer, wherein the narrowband signal has a second bandwidth smaller than the first bandwidth. The wideband audio signal coding/decoding device and method may code a wideband audio signal while maintaining a low bit rate.
    Type: Grant
    Filed: October 15, 2008
    Date of Patent: May 1, 2012
    Assignee: Gwangju Institute of Science and Technology
    Inventors: Hong Kook Kim, Young Han Lee
  • Patent number: 8170218
    Abstract: A multi-channel audio treatment method ensuring compatibility of a multi-channel signal and a stereo signal which includes: producing a left-hand downmix channel dwnMxL(t) and a right-hand downmix channel dwnMxR(t); producing a left-hand difference channel deltaL(t), said left-hand difference channel being the difference between the left-hand channel of the stereo signal eStL(t) and the left-hand downmix channel dwnMxL(t); producing a right-hand difference channel deltaR(t), said right-hand difference channel being the difference between the right-hand channel of the stereo signal eStR(t) and the right-hand downmix channel dwnMxR(t); and adding the right hand difference channel deltaR(t) and the left hand difference channel deltaL(t) into the multi-channel signal.
    Type: Grant
    Filed: October 4, 2007
    Date of Patent: May 1, 2012
    Inventor: Antoine-Victor Hurtado-Huyssen
  • Patent number: 8170871
    Abstract: An encoding device (1) and method convert a set of signals (l, r) into a dominant signal (m) containing most signal energy, a residual signal (s) containing a remainder of the signal energy, and signal parameters (IID, ICC) associated with the conversion. The dominant signal (m) and selected parts of the residual signal (s) are encoded. Selecting parts of the residual signal involves a residual signal (s?) passing perceptually relevant parts of the residual signal (s), attenuating perceptually less relevant parts of the residual signal and suppressing least relevant parts of the residual signal. An associated decoding device (2) and method decode the encoded dominant signal and the encoded residual signal so as to produce a decoded dominant signal (m?u) and a decoded residual signal (s?mod) respectively. A synthetic residual signal (s?syn) is derived from the decoded dominant signal (m?u) and is attenuated so as to produce an attenuated synthetic residual signal (s?syn,mod).
    Type: Grant
    Filed: October 8, 2010
    Date of Patent: May 1, 2012
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Francois Philippus Myburg, Dirk Jeroen Breebaart, Erik Gosuinus Petrus Schuijers
  • Publication number: 20120093321
    Abstract: An apparatus and method for encoding and decoding a spatial parameter are provided. A spatial parameter encoding apparatus may encode a spatial parameter using a correlation between spatial parameters indicating a characteristic relationship between channels of a multi-channel audio signal, so that the multi-channel audio signal may be efficiently encoded.
    Type: Application
    Filed: October 12, 2011
    Publication date: April 19, 2012
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Hwan SHIM, Eun-Mi Oh, Mi-Young Kim, Anton V. Porov
  • Publication number: 20120093322
    Abstract: Downmixing multi-channel audio signals to target channels by pre-downmixing frequency coefficients that are encoded using a most frequently used block type in stereo channels in the frequency domain, thereby reducing an amount of calculations and an amount of power required to downmix the multi-channel audio signals.
    Type: Application
    Filed: October 13, 2011
    Publication date: April 19, 2012
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventor: Chang-joon LEE
  • Patent number: 8160258
    Abstract: An encoding method and apparatus and a decoding method and apparatus are provided. The decoding method includes extracting a down-mix signal and down-mix identification information from an input bitstream, determining, based on the down-mix identification information, whether the down-mix signal is a 3D down-mix signal obtained by performing a three-dimensional (3D) rendering operation, and if the down-mix signal is not 3D down-mix signal, generating a 3D down-mix signal by performing a 3D rendering operation. Accordingly, it is possible to efficiently encode multi-channel signals with 3D effects and to adaptively restore and reproduce audio signals with optimum sound quality according to the characteristics of an audio reproduction environment.
    Type: Grant
    Filed: February 7, 2007
    Date of Patent: April 17, 2012
    Assignee: LG Electronics Inc.
    Inventors: Yang Won Jung, Hee Suk Pang, Hyen O Oh, Dong Soo Kim, Jae Hyun Lim
  • Patent number: 8160259
    Abstract: An audio signal processing apparatus includes a localization direction detector that detects localization directions of two-channel input audio signals, a localization direction distribution calculator that calculates a distribution of the localization directions detected by the localization direction detector, a gain table information recording unit that records gain table information defining weights corresponding to respective localization angles, a gain generator that generates a gain corresponding to an output audio signal on the basis of the distribution calculated by the localization direction distribution calculator and the gain table information recorded in the gain table information recording unit, and a synthesizing unit that synthesizes the two-channel input audio signals using the gain generated by the gain generator.
    Type: Grant
    Filed: July 12, 2007
    Date of Patent: April 17, 2012
    Assignee: Sony Corporation
    Inventors: Masayoshi Noguchi, Gen Ichimura
  • Patent number: 8160260
    Abstract: A circuit for processing multichannel audio signals, comprises a frequency characteristics correction device and an output device. The frequency characteristics correction device corrects frequency characteristics of an audio signal of a channel including an audio signal component having a predetermined frequency band, of audio signals of a multichannel comprising at least a right channel and a left channel, in accordance with correction characteristics determined based on a head related transfer function. The output device mixes the audio signal component having the frequency characteristics corrected with an audio signal of the right channel and an audio signal of the left channel to generate mixed output audio signals, and outputting the mixed output audio signals as a right channel output audio signal and a left channel output audio signal.
    Type: Grant
    Filed: October 22, 2008
    Date of Patent: April 17, 2012
    Assignee: Pioneer Corporation
    Inventors: Kei Sakagami, Shintaro Hosoi, Ikuko Kawamura
  • Publication number: 20120082316
    Abstract: An audio encoder and decoder use architectures and techniques that improve the efficiency of multi-channel audio coding and decoding. The described strategies include various techniques and tools, which can be used in combination or independently. For example, an audio encoder performs a pre-processing multi-channel transform on multi-channel audio data, varying the transform so as to control quality. The encoder groups multiple windows from different channels into one or more tiles and outputs tile configuration information, which allows the encoder to isolate transients that appear in a particular channel with small windows, but use large windows in other channels. Using a variety of techniques, the encoder performs flexible multi-channel transforms that effectively take advantage of inter-channel correlation. An audio decoder performs corresponding processing and decoding. In addition, the decoder performs a post-processing multi-channel transform for any of multiple different purposes.
    Type: Application
    Filed: December 14, 2011
    Publication date: April 5, 2012
    Applicant: Microsoft Corporation
    Inventors: Naveen Thumpudi, Wei-Ge Chen
  • Patent number: 8150042
    Abstract: Techniques are described for combining parametric multi-channel audio coding with matrixing, reconstructing a full-quality multi-channel, independent of the decoder. A stereo signal is obtained from encoding an N-channel audio signal into spatial parameters and a stereo down-mix signal having first and second stereo signals, including adding a first signal and a third signal to obtain a first output signal, the first signal having the first stereo signal modified by a first complex function, the third signal having the second stereo signal modified by a third complex function. A second signal and fourth signal are similarly added to obtain a second output signal. Complex functions are chosen such that an energy value of the difference between first signal and the second signals (fourth signal and third signals) is larger than or equal to the energy value of the sum of the first and the second signal (fourth signal and third signal).
    Type: Grant
    Filed: July 7, 2005
    Date of Patent: April 3, 2012
    Assignees: Koninklijke Philips Electronics N.V., Coding Technologies AB
    Inventors: Machiel Willem Van Loon, Dirk Jeroen Breebaart, Gerard Herman Hotho, Erik Gosuinus Petrus Schuijers, Heiko Purnhagen, Karl Jonas Roden
  • Publication number: 20120076308
    Abstract: An acoustic echo suppression unit according to an embodiment of the present invention includes and input interface for extracting a downmix signal from an input signal, the input signal including the downmix signal and parametric side information, wherein the downmix and the parametric side information together represent a multichannel signal, a calculator for calculating filter coefficients for an adaptive filter, wherein the calculator is adapted to determine the filter coefficients based on the downmix signal and a microphone signal or a signal derived from the microphone signal, and an adaptive filter adapted to filter the microphone signal or the signal derived from the microphone signal based on the filter coefficients to suppress an echo caused by the multichannel signal in the microphone signal.
    Type: Application
    Filed: October 13, 2011
    Publication date: March 29, 2012
    Applicant: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
    Inventors: Fabian KUECH, Markus KALLINGER, Markus SCHMIDT, Meray ZOURUB, Marco DIATSCHUK, Oliver MOSER
  • Publication number: 20120076309
    Abstract: A multi-channel decoding method includes: receiving an input signal to generate a channel output signal; providing a first test signal serving as the input signal in a first calibration mode; and adjusting a DC voltage level of the channel output signal with a first calibration signal by reducing a difference between a first predetermined reference signal level and a DC voltage level of the channel output signal generated from the first test signal.
    Type: Application
    Filed: December 1, 2011
    Publication date: March 29, 2012
    Inventors: Chieh-Hung Chen, Tsung-Ling Li, Chia-Huang Fu
  • Patent number: 8144879
    Abstract: A method and a device are described for processing a stereo signal obtained from an encoder, which encodes an N-channel audio signal into spatial parameters (P) and a stereo down-mix comprising first and second stereo signals (LO, RO). A first signal and a third signal are added in order to obtain a first output signal (L0w), wherein the first signal (L0wL) comprises the first stereo signal (LO) modified by a first complex function (g1), and the third signal (L0wR) comprises the second stereo signal (RO) modified by a third complex function (g3). A second signal and a fourth signal are added to obtain a second output signal (R0w). The fourth signal (R0wR) comprises the second stereo signal (RO) modified by a fourth complex function (g4), and the second signal (R0wL) comprises the first stereo signal (LO) modified by a second complex function (g2).
    Type: Grant
    Filed: September 15, 2010
    Date of Patent: March 27, 2012
    Assignees: Koninklijke Philips Electronics N.V., Coding Technologies AB
    Inventors: Machiel Willem Van Loon, Dirk Jeroen Breebaart, Gerard Herman Hotho, Erik Gosuinus Petrus Schuijers, Heiko Purnhagen, Karl Jonas Roeden
  • Publication number: 20120070007
    Abstract: A method and apparatus of effectively encoding and decoding a high-frequency signal of a multi-channel audio are provided. A multi-channel audio decoding apparatus may down-mix a multi-channel audio input signal, expand a number of channels of the down-mixed signal, select at least one of the expanded channel signal, extract a parameter indicating a characteristic relation between the selected signal and the multi-channel audio input signal, and encode the down-mixed signal and the extracted parameter.
    Type: Application
    Filed: September 14, 2011
    Publication date: March 22, 2012
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Mi Young KIM, Ki Hyun CHOO, Eun Mi OH, Boris KUDRYASHOV, Kirill YURKOV
  • Patent number: 8139775
    Abstract: According to the present invention, multiple parametrically encoded audio signals can be efficiently combined using an audio signal generator, which generates an audio output signal by combining the down-mix channels and the associated parameters of the audio signals directly within the parameter domain, i.e. without reconstructing or decoding the individual input audio signals prior to the generation of the audio output signal. This is achieved by direct mixing of the associated down-mix channels of the individual input signals. It is one key feature of the present invention that the combination of the down-mix channels is achieved by simple, computationally inexpensive arithmetic operations.
    Type: Grant
    Filed: April 24, 2007
    Date of Patent: March 20, 2012
    Assignee: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
    Inventors: Johannes Hilpert, Juergen Herre, Karsten Linzmeier, Oliver Hellmuth, Thorsten Kastner
  • Publication number: 20120063604
    Abstract: An audio encoder adapted to encode a multi-channel audio signal. The encoder comprises an encoder combination module (ECM) for generating a dominant signal part and a residual signal part being a combined representation of first and second audio signals, the dominant and residual signal parts being obtained by applying a mathematical procedure to the first and second audio signals. The mathematical procedure involves a spatial parameter comprising a description of spatial properties of the first and second audio signals. Embodiments include a plurality of interconnected encoder combination module, so that e.g. six independent 5.1 format audio signals can be encoded to a single or two dominant signal parts and a number of parameter sets and residual signal parts.
    Type: Application
    Filed: September 7, 2011
    Publication date: March 15, 2012
    Applicant: KONINKLIJKE PHILIPS ELECTRONICS N.V.
    Inventors: Francois Philippus MYBURG, Erik Gosuinus Petrus SCHUIJERS
  • Publication number: 20120057710
    Abstract: An apparatus for determining a spatial output multi-channel audio signal based on an input audio signal and an input parameter. The apparatus includes a decomposer for decomposing the input audio signal based on the input parameter to obtain a first decomposed signal and a second decomposed signal different from each other. Furthermore, the apparatus includes a renderer for rendering the first decomposed signal to obtain a first rendered signal having a first semantic property and for rendering the second decomposed signal to obtain a second rendered signal having a second semantic property being different from the first semantic property. The apparatus comprises a processor for processing the first rendered signal and the second rendered signal to obtain the spatial output multi-channel audio signal.
    Type: Application
    Filed: November 8, 2011
    Publication date: March 8, 2012
    Inventors: Sascha DISCH, Ville PULKKI, Mikko-Ville LAITINEN, Cumhur ERKUT
  • Patent number: 8131386
    Abstract: A method and apparatus for distributing stereo signal of an audio system integrated with an home automation system. The audio system is further integrated with intercom and video intercom including the controlling of the intercom communications and the home automation appliances via a network and the Internet. The stereo signals are encoded and distributed from a selector/encoder, via distributors or directly to speakers via at least one single twisted pair carrying the encoded signals multiplexed with serial signals and with microphone signals for communicating with the intercom or with e-station via the network or the Internet. The multiplexed signals are propagated via the same twisted pair that also feeds a constant current to the system devices or providing power via separated twisted pair. The speakers include wired or wireless remote control receivers and transmitters for propagating remote control signals.
    Type: Grant
    Filed: June 15, 2009
    Date of Patent: March 6, 2012
    Assignee: Elbex Video Ltd.
    Inventor: David Elberbaum
  • Publication number: 20120051547
    Abstract: An apparatus for determining a spatial output multi-channel audio signal based on an input audio signal and an input parameter. The apparatus includes a decomposer for decomposing the input audio signal based on the input parameter to obtain a first decomposed signal and a second decomposed signal different from each other. Furthermore, the apparatus includes a renderer for rendering the first decomposed signal to obtain a first rendered signal having a first semantic property and for rendering the second decomposed signal to obtain a second rendered signal having a second semantic property being different from the first semantic property. The apparatus comprises a processor for processing the first rendered signal and the second rendered signal to obtain the spatial output multi-channel audio signal.
    Type: Application
    Filed: November 8, 2011
    Publication date: March 1, 2012
    Inventors: Sascha DISCH, Ville Pulkki, Mikko-Ville Laitinen, Cumhur Erkut
  • Patent number: 8126173
    Abstract: A method includes splitting and filtering a left input signal and a right input signal to produce a plurality of frequency sub-bands. Each of the frequency sub-bands includes a left sub-band signal and a right sub-band signal. The method also includes processing the left and right sub-band signals associated with each of the frequency sub-bands into a plurality of sub-band channel signals. The plurality of sub-band channel signals includes at least three sub-band channel signals. In addition, the method includes summing corresponding ones of the sub-band channel signals for reproduction in a corresponding channel of a plurality of channels. The plurality of sub-band channel signals may include a left sub-band channel signal, a right sub-band channel signal, a center sub-band channel signal, a left surround sub-band channel signal, and a right surround sub-band channel signal.
    Type: Grant
    Filed: January 17, 2006
    Date of Patent: February 28, 2012
    Assignee: STMicroelectronics Asia Pacific Pte., Ltd.
    Inventors: Yuan Wu, Sapna George
  • Publication number: 20120045067
    Abstract: Disclosed are a encoding device, a decoding device, and encoding and decoding methods, wherein when a multi-channel signal is encoded with high efficiency, using an adaptive filter, the number of arithmetic operations to update a filter coefficient of the adaptive filter can be reduced. An update range determination unit (170) determines the range of a filter coefficient order (update order range) of a filter coefficient to be updated, among filter coefficients gk(n) of the adaptive filter, on the basis of a mutual correlation function between an input (L) signal and an input (R) signal. The adaptive filter (130) updates the filter coefficient gk(n) of the filter coefficient order (n) to be updated, using a decoding (L) signal and a decoding error (R) signal.
    Type: Application
    Filed: May 19, 2010
    Publication date: February 23, 2012
    Applicant: PANASONIC CORPORATION
    Inventor: Masahiro Oshikiri
  • Patent number: 8121830
    Abstract: Methods and apparatus to extract data encoded in media content are disclosed. An example method includes receiving a media content signal, sampling the media content signal to generate digital samples, determining a frequency domain representation of the digital samples, determining a first rank of a first frequency in the frequency domain representation, determining a second rank of a second frequency in the frequency domain representation, combining the first rank and the second rank with a set of ranks to create a combined set of ranks, comparing the combined set of ranks to a set of reference sequences, determining a data represented by the combined set of ranks based on the comparison, and storing the data in a tangible memory.
    Type: Grant
    Filed: October 22, 2009
    Date of Patent: February 21, 2012
    Assignee: The Nielsen Company (US), LLC
    Inventors: Venugopal Srinivasan, Alexander Pavlovich Topchy
  • Publication number: 20120039477
    Abstract: An audio synthesizing apparatus receives an encoded signal comprising a downmix signal and parametric extension data for expanding the downmix signal to a multi-sound source signal. A decomposition processor (205) performs a signal decomposition of the downmix signal to generate at least a first signal component and a second signal component, where the second signal component is at least partially decorrelated with the first signal component. A position processor (207) determines a first spatial position indication for the first signal component in response to the parametric extension data and a binaural processor (211) synthesizes the first signal component based on the first spatial position indication and the second signal component to originate from a different direction. The invention may provide improved spatial experience from e.g. headphones by using a direct synthesis of a main directional signal from the appropriate position rather than as a combination of signals from virtual loudspeaker positions.
    Type: Application
    Filed: April 14, 2010
    Publication date: February 16, 2012
    Applicant: KONINKLIJKE PHILIPS ELECTRONICS N.V.
    Inventors: Erik Gosuinus Petrus Schijers, Arnoldus Werner Johannes Oomen, Fransiscus Marinus Jozephus De Bont, Mykola Ostrovskyy, Adriaan Johannes Rijnberg, Jeroen Gerardus Henricus Koppens
  • Patent number: 8116460
    Abstract: The present invention provides improvements to prior art audio codecs that generate a stereo-illusion through post-processing of a received mono signal. These improvements are accomplished by extraction of stereo-image describing parameters at the encoder side, which are transmitted and subsequently used for control of a stereo generator at the decoder side. Furthermore, the invention bridges the gap between simple pseudo-stereo methods, and current methods of true stereo-coding, by using a new form of parametric stereo coding. A stereo-balance parameter is introduced, which enables more advanced stereo modes, and in addition forms the basis of a new method of stereo-coding of spectral envelopes, of particular use in systems where guided HFR (High Frequency Reconstruction) is employed. As a special case, the application of this stereo-coding scheme in scalable HFR-based codecs is described.
    Type: Grant
    Filed: September 28, 2005
    Date of Patent: February 14, 2012
    Assignee: Coding Technologies AB
    Inventors: Fredrik Henn, Kristofer Kjorling, Lars Liljeryd, Jonas Roden, Jonas Engdegard
  • Patent number: 8116459
    Abstract: The present invention is based on the finding that a reconstructed output channel, reconstructed with a multi-channel reconstructor using at least one downmix channel derived by downmixing a plurality of original channels and using a parameter representation including additional information on a temporal fine structure of an original channel can be reconstructed efficiently with high quality, when a generator for generating a direct signal component and a diffuse signal component based on the downmix channel is used. The quality can be essentially enhanced, if only the direct signal component is modified such that the temporal fine structure of the reconstructed output channel is fitting a desired temporal fine structure, indicated by the additional information on the temporal fine structure transmitted.
    Type: Grant
    Filed: May 18, 2006
    Date of Patent: February 14, 2012
    Assignee: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
    Inventors: Sascha Disch, Karsten Linzmeier, Juergen Herre, Harald Popp
  • Publication number: 20120033819
    Abstract: Provided are a signal processing method capable of inserting additional information into a bitstream without departing from the AC-3 standard or the Enhanced AC-3 standard. The signal processing method includes: extracting additional information which is for performing at least one of a channel number expansion of an audio signal in an encoding apparatus and a three-dimensional (3D) reproduction of the audio signal in the encoding apparatus; encoding the audio signal according to a predetermined standard; formatting the encoded audio signal into a bitstream including bitstream information, at least one audio block and an auxiliary data field; and inserting the additional information into at least one of additional bitstream information included in the bitstream information, a skip field included in the audio block and auxiliary data bits included in the auxiliary data field.
    Type: Application
    Filed: August 5, 2011
    Publication date: February 9, 2012
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Nam-suk LEE, Jong-Hoon JEONG
  • Patent number: 8111829
    Abstract: Provided are a method and apparatus for encoding and decoding a stereo signal or a multi-channel signal. According to the method and apparatus, a stereo signal or a multi-channel signal can be encoded and/or decoded by generating parameters based on a mono signal.
    Type: Grant
    Filed: October 23, 2007
    Date of Patent: February 7, 2012
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Ki-hyun Choo, Eun-mi Oh, Jung-hoe Kim, Boris Kudryashov, Sergey Petrov
  • Patent number: 8111830
    Abstract: An active audio matrix decoding method and apparatus to generate multi-channel audio signals from a stereo channel audio signal.
    Type: Grant
    Filed: December 19, 2006
    Date of Patent: February 7, 2012
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Han-gil Moon, Manish Arora
  • Patent number: 8098840
    Abstract: A multi-channel output device for a multimedia device includes a plurality of reception ends, an amplifier having an input end and an output end, a plurality of sound output devices for outputting sound, a first switching unit coupled between the plurality of reception ends and the input end of the amplifier for coupling a reception end of the plurality of reception ends to the input end of the amplifier according to a control signal, a second switching unit coupled between the output end of the amplifier and the plurality of sound output devices for coupling the output end of the amplifier to a sound output device of the plurality of sound output devices according to the control signal, and a control unit coupled to the first switching unit and the second switching unit for outputting the control signal.
    Type: Grant
    Filed: December 23, 2008
    Date of Patent: January 17, 2012
    Assignee: Anpec Electronics Corporation
    Inventor: Chiung-Ching Ku
  • Publication number: 20120002818
    Abstract: The application relates to audio encoder and decoder systems. An embodiment of the encoder system comprises a downmix stage for generating a downmix signal and a residual signal based on a stereo signal. In addition, the encoder system comprises a parameter determining stage for determining parametric stereo parameters such as an inter-channel intensity difference and an inter-channel cross-correlation. Preferably, the parametric stereo parameters are time- and frequency-variant. Moreover, the encoder system comprises a transform stage. The transform stage generates a pseudo left/right stereo signal by performing a transform based on the downmix signal and the residual signal. The pseudo stereo signal is processed by a perceptual stereo encoder. For stereo encoding, left/right encoding or mid/side encoding is selectable. Preferably, the selection between left/right stereo encoding and mid/side stereo encoding is time- and frequency-variant.
    Type: Application
    Filed: March 5, 2010
    Publication date: January 5, 2012
    Applicant: DOLBY INTERNATIONAL AB
    Inventors: Purnhagen Heiko, Pontus Carlsson, Kristofer Kjoerling
  • Patent number: RE43132
    Abstract: A motion picture soundtrack reproduction system has a center front soundtrack channel and a plurality of other soundtrack channels. A volume control adjusts the gain of all the channels. The volume control has a range of settings from a minimum to a maximum, the gain of the center front channel having substantially a first relationship to the volume control settings and the gain of the other channels having substantially a second relationship to the volume control settings, the relationships being such that for a range of volume control settings less than a first setting the gain of the center front channel remains substantially constant while the gain of the other channels decreases as the setting decreases or decreases more gradually than the gain of the other channels as the setting decreases.
    Type: Grant
    Filed: June 26, 2009
    Date of Patent: January 24, 2012
    Assignee: Dolby Laboratories Licensing Corporation
    Inventor: Stephen M. Jacobs