4-2-4 Patents (Class 381/21)
  • Patent number: 10237652
    Abstract: A volume control device controls reproduced sound levels at the listening position set to the seat in the vehicle compartment, and gives the phase difference to an externally inputted sound signal, and supplies the sound signals to two speakers. Here, the phase difference is calculated, at a frequency lower than a predetermined frequency, for sound signals reproduced by the speakers in front of and behind the listening position. Also, the phase difference is calculated to make a reproduced sound level at the listening position smaller than the reproduced sound level when the sound signal is reproduced by either one of the pair of speakers. Preferably, the listening position includes two evaluation points, and the reproduced sound level at the listening position is a sum of the reproduced sound levels at the two evaluation points. Thus, the reproduced sound may become small at an arbitrary listening position in the acoustic space.
    Type: Grant
    Filed: October 24, 2014
    Date of Patent: March 19, 2019
    Assignee: PIONEER CORPORATION
    Inventor: Akihiro Iseki
  • Patent number: 9197978
    Abstract: A sound reproduction apparatus includes a sound source localization estimating unit that performs estimates using input audio signals in an acoustic space when the input audio signals are reproduced by speakers placed in standard positions; and a sound source signal separating unit that calculates a sound source localization signal and separates, from the input audio signals, sound source non-localization signals. Additionally, a sound source position parameter calculating unit calculates parameters indicating a position of the sound source localization signal in the acoustic space; and a reproduction signal generating unit uses the sound source position parameters to distribute the sound source localization signal to front speakers placed in the standard positions in front and headphones placed near the ears of a listener and in positions different from the standard positions, by combining the sound source localization signal and the sound source non-localization signals.
    Type: Grant
    Filed: March 25, 2010
    Date of Patent: November 24, 2015
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Hikaru Usami, Naoya Tanaka, Toshihiko Date
  • Patent number: 9042558
    Abstract: A decoding apparatus (10) is disclosed which includes: a storing means (11) for storing encoded audio signals including multi-channel audio signals; a transforming means (40) for transforming the encoded audio signals to generate transform block-based audio signals in a time domain; a window processing means (41) for multiplying the transform block-based audio signals by a product of a mixture ratio of the audio signals and a first window function, the product being a second window function; a synthesizing means (43) for overlapping the multiplied transform block-based audio signals to synthesize audio signals of respective channels; and a mixing means (14) for mixing audio signals of the respective channels between the channels to generate a downmixed audio signal. Furthermore, an encoding apparatus is also disclosed which downmixes the multi-channel audio signals, encodes the downmixed audio signals, and generates the encoded, downmixed audio signals.
    Type: Grant
    Filed: October 1, 2008
    Date of Patent: May 26, 2015
    Assignee: GVBB Holdings S.A.R.L.
    Inventor: Yousuke Takada
  • Patent number: 9025775
    Abstract: An apparatus for enhancing a multichannel audio signal comprising at least two channels configured to: estimate a value representing a direction of arrival associated with a first audio signal from at least a first channel and a second audio signal from at least a second channel of at least two channels of a multichannel audio signal; determine a scaling factor dependent on the direction of arrival associated with the first audio signal and the second audio signal; and apply the scaling factor to a parameter associated with a difference in audio signal levels between the first audio signal and the second audio sign.
    Type: Grant
    Filed: July 1, 2008
    Date of Patent: May 5, 2015
    Assignee: Nokia Corporation
    Inventor: Pasi Ojala
  • Publication number: 20140362997
    Abstract: A system, computer-implemented method, and tangible computer-readable media for media playback. The method includes receiving a request from a user to play a media asset, detecting capabilities of the playback device, detecting playback environment acoustic characteristics, optimizing media playback settings for the playback device and the playback environment characteristics, preparing the media asset for playback on the playback device, and transferring the prepared media asset to the playback device for playback. The method can further transfer optimized playback settings to the playback device. Media asset preparation can be based at least in part on the optimized playback settings. A playback profile can store environment characteristics and playback device capabilities. The method continuously detects changes in the playback environment characteristics, and optimizes media playback settings when detected changes exceed a threshold.
    Type: Application
    Filed: August 25, 2014
    Publication date: December 11, 2014
    Inventors: Andrea BASSO, Zhu LIU, Bernard S. Renger, Behzad SHAHRARAY
  • Patent number: 8824689
    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: Grant
    Filed: February 11, 2011
    Date of Patent: September 2, 2014
    Assignee: Fraunhofer-Gesellschaft zur Foerderung der Angewandten Forschung E.V.
    Inventors: Sascha Disch, Ville Pulkki, Mikko-Ville Laitinen, Cumhur Erkut
  • Patent number: 8804970
    Abstract: An audio encoder has a common preprocessing stage, an information sink based encoding branch such as spectral domain encoding branch, a information source based encoding branch such as an LPC-domain encoding branch and a switch for switching between these branches at inputs into these branches or outputs of these branches controlled by a decision stage. An audio decoder has a spectral domain decoding branch, an LPC-domain decoding branch, one or more switches for switching between the branches and a common post-processing stage for post-processing a time-domain audio signal for obtaining a post-processed audio signal.
    Type: Grant
    Filed: January 11, 2011
    Date of Patent: August 12, 2014
    Assignee: Fraunhofer-Gesellschaft zur Foerderung der Angewandten Forschung E.V.
    Inventors: Bernhard Grill, Stefan Bayer, Guillaume Fuchs, Stefan Geyersberger, Ralf Geiger, Johannes Hilpert, Ulrich Kraemer, Jeremie Lecomte, Markus Multrus, Max Neuendorf, Harald Popp, Nikolaus Rettelbach, Frederik Nagel, Sascha Disch, Juergen Herre, Yoshikazu Yokotani, Stefan Wabnik, Gerald Schuller, Jens Hirschfeld
  • Patent number: 8804971
    Abstract: A method for encoding a multichannel audio input signal, including steps of generating a downmix of low frequency components of a subset of channels of the input signal, waveform coding each channel of the downmix, thereby generating waveform coded, downmixed data, performing parametric encoding on at least some higher frequency components of each channel of the input signal, thereby generating parametrically coded data, and generating an encoded audio signal (e.g., an E-AC-3 encoded signal) indicative of the waveform coded, downmixed data and the parametrically coded data. Other aspects are methods for decoding such an encoded signal, and systems configured to perform any embodiment of the inventive method.
    Type: Grant
    Filed: August 27, 2013
    Date of Patent: August 12, 2014
    Assignees: Dolby International AB, Dolby Laboratories Licensing Corporation
    Inventors: Phillip A. Williams, Michael Schug, Robin Thesing
  • Patent number: 8768691
    Abstract: A sound encoder for efficiently encoding stereophonic sound. A prediction parameter analyzer determines a delay difference D and an amplitude ratio g of a first-channel sound signal with respect to a second-channel sound signal as channel-to-channel prediction parameters from a first-channel decoded signal and a second-channel sound signal. A prediction parameter quantizer quantizes the prediction parameters, and a signal predictor predicts a second-channel signal using the first decoded signal and the quantization prediction parameters. The prediction parameter quantizer encodes and quantizes the prediction parameters (the delay difference D and the amplitude ratio g) using a relationship (correlation) between the delay difference D and the amplitude ratio g attributed to a spatial characteristic (e.g., distance) from a sound source of the signal to a receiving point.
    Type: Grant
    Filed: March 23, 2006
    Date of Patent: July 1, 2014
    Assignee: Panasonic Corporation
    Inventor: Koji Yoshida
  • Patent number: 8705779
    Abstract: A surround sound virtualization apparatus and method. The surround sound virtualization apparatus may include an audio decoder to perform head-related transfer function (HRTF) filtering, and a time delay unit to provide a time delay to a plurality of output signals of the audio decoder.
    Type: Grant
    Filed: June 29, 2009
    Date of Patent: April 22, 2014
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Kang Eun Lee, Do-Hyung Kim, Chang Yong Son
  • Patent number: 8693697
    Abstract: An encoder and encoding method for use in a surround sound system wherein at least four audio input signals representing an original sound field are encoded into two channel signals and the encoded two channel signals are decoded into at least four audio output signals corresponding to the four audio input signals. The encoder includes matrix structure connected to receive the four audio input signals for encoding the four input signals into two channel output signals. The matrix structure is responsive to the four input signals for producing L and R output signals as follows: L=FL+kFR+jRL+jkRR R=FR+kFL?jRR?jkRL wherein k denotes a transformation or matrix constant having a value approximately 0.207 and j denotes a 90 degree phase shift.
    Type: Grant
    Filed: December 16, 2011
    Date of Patent: April 8, 2014
    Assignee: Reality IP Pty Ltd
    Inventor: Charlie Corneles Van Dongen
  • Patent number: 8625810
    Abstract: An encoding method and apparatus and a decoding method and apparatus are provided. The decoding method includes extracting a down-mix signal and spatial information regarding a plurality of channels from an input bitstream, and generating a three-dimensional (3D) down-mix signal by performing a 3D rendering operation on the down-mix signal using the spatial information and a filter, wherein the sum of the number of valid signals of the down-mix signal, the number of valid signals of the spatial information, and the number of valid signals of co-efficients of the filter is less than the number of valid signals of the 3D down-mix signal. 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: January 7, 2014
    Assignee: LG Electronics, Inc.
    Inventors: Yang Won Jung, Hee Suk Pang, Hyen O Oh, Dong Soo Kim, Jae Hyun Lim
  • Patent number: 8625811
    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: February 6, 2012
    Date of Patent: January 7, 2014
    Assignee: SAMSUNG Electronics Co., Ltd.
    Inventors: Ki-hyun Choo, Eun-mi Oh, Jung-hoe Kim, Boris Kudryashov, Sergey Petrov
  • Patent number: 8611545
    Abstract: A surround system includes a decoder that decodes an encoded audio data stream, a decorrelation unit that receives and decorrelates stereo signals decoded by the decoder so as to generate surround signals having a low-correlation component, an addition unit that adds high-correlation-component signals extracted from the stereo signals to the surround signals generated by the decorrelation unit, and a controller that controls addition of the high-correlation-component signals performed by the addition unit on the basis of the bit rate of the audio data stream.
    Type: Grant
    Filed: March 26, 2009
    Date of Patent: December 17, 2013
    Assignee: Alpine Electronics, Inc.
    Inventor: Noriyuki Takashima
  • Patent number: 8605912
    Abstract: Biphase mark codes (BMC) are used in digital communications. Most BMC formats use preambles for rate determination and synchronization. A decoder compares the intervals of continuous high or continuous low voltages in a BMC stream to predetermined minimum and maximum values of half cell, full cell and one-and-a-half cell intervals for all supported sampling rates. If a pattern matching a preamble is found, the sampling rate is locked in and the decoder is synchronized to the BMC stream. Once locked, the decoder uses the predetermined minimum and maximum values at the locked rate to generate half cell, full cell and one-and-a-half cell indicators for a decoding state machine which decodes data in the BMC stream or decodes expected preambles.
    Type: Grant
    Filed: April 22, 2011
    Date of Patent: December 10, 2013
    Assignee: Conexant Systems, Inc.
    Inventors: Mouna Elkhatib, Jimmy Pu
  • Patent number: 8600532
    Abstract: A method of processing a signal is disclosed, which includes receiving a downmix signal, object information and rendering information; and generating downmix processing information using the object information and the rendering information, the object information including modified object level information, wherein the modified object level information is determined using a level of a modified object generated by applying a downmix gain to an object. Accordingly, in an apparatus for processing a signal and method thereof according to the present invention, the signal is decoded using object information including modified object level information. Therefore, since a downmix gain is not transmitted, the present invention is able to reduce a used bit for object information and decode a signal using less information.
    Type: Grant
    Filed: December 9, 2008
    Date of Patent: December 3, 2013
    Assignee: LG Electronics Inc.
    Inventors: Hyen-O Oh, Yang Won Jung
  • Patent number: 8595017
    Abstract: Audio encoding method and device comprising the transmission, in addition to the data representing a frequency-limited signal, of information relating to a temporal filter that can be applied to the entire broadened signal, both in its transmitted low-frequency part and in its reconstituted high-frequency part. The application of this filter allowing the reshaping the reconstituted high-frequency part and the correction of compression artifacts present in the transmitted low-frequency part. In this way, the application of the temporal filter, simple and inexpensive, to all or part of the reconstituted signal, makes it possible to obtain a signal of good perceived quality.
    Type: Grant
    Filed: December 27, 2007
    Date of Patent: November 26, 2013
    Assignee: Mobiclip
    Inventor: Alexandre Delattre
  • Patent number: 8588947
    Abstract: An apparatus for processing an audio signal and method thereof are disclosed.
    Type: Grant
    Filed: October 13, 2009
    Date of Patent: November 19, 2013
    Assignee: LG Electronics Inc.
    Inventors: Hyen-O Oh, Yang Won Jung
  • Publication number: 20130223633
    Abstract: Provided is a stereo signal encoding device that enables a lower bitrate without decreasing quality when applying an intermittent transmission technique to a stereo signal. A stereo encoding unit (103) generates first stereo encoded data by encoding the stereo signal when the stereo signal of the current frame is an audio section A stereo DTX encoding unit (104) is a means for encoding the stereo signal when the stereo signal of the current frame is a non-audio section, and generates second stereo encoded data by encoding each of: a monaural signal spectral parameter that is a spectral parameter of a monaural signal generated using the first channel signal and the second channel signal; first channel signal information relating to the first channel signal; and second channel signal information relating to the second channel signal.
    Type: Application
    Filed: October 17, 2011
    Publication date: August 29, 2013
    Applicant: PANASONIC CORPORATION
    Inventors: Masahiro Oshikiri, Hiroyuki Ehara
  • Patent number: 8503683
    Abstract: An encoding method and apparatus and a decoding method and apparatus are provided. The decoding method includes extracting a down-mix signal and spatial information regarding a plurality of channels from an input bitstream, and generating a three-dimensional (3D) down-mix signal by performing a 3D rendering operation on the down-mix signal using the spatial information and a filter, wherein the sum of the number of valid signals of the down-mix signal, the number of valid signals of the spatial information, and the number of valid signals of co-efficients of the filter is less than the number of valid signals of the 3D down-mix signal. 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: August 6, 2013
    Assignee: LG Electronics, Inc.
    Inventors: Yang Won Jung, Hee Suk Pang, Hyen O Oh, Dong Soo Kim, Jae Hyun Lim
  • Patent number: 8467549
    Abstract: An audio information processing apparatus for processing input audio information is adapted to input an audio signal composed of front area audio information that should be input to a front speaker and rear area audio information that should be input to a plurality of speakers. A mixer is adapted to mix the rear area audio information in accordance with an instruction from an instruction circuit.
    Type: Grant
    Filed: August 14, 2007
    Date of Patent: June 18, 2013
    Assignee: Canon Kabushiki Kaisha
    Inventor: Taizo Hori
  • Patent number: 8428267
    Abstract: A method for processing an audio signal, comprising: receiving a downmix signal, a first multi-channel information, and an object information; processing the downmix signal using the object information and a mix information; and, transmitting one of the first multi-channel information and a second multi-channel information according to the mix information, wherein the second channel information is generated using the object information and the mix information is disclosed.
    Type: Grant
    Filed: December 7, 2007
    Date of Patent: April 23, 2013
    Assignee: LG Electronics Inc.
    Inventors: Hyen-O Oh, Yang-Won Jung
  • Patent number: 8422688
    Abstract: The present invention includes an audio signal receiving unit receiving the audio signal having a plurality of channel signals including an ambient component signal and a source component signal; an ambient component signal extracting unit extracting the ambient component signal of each of the channels based on correlation between the channel signals; an ambient component signal modifying unit modifying the ambient component signal using surround effect information; a source component signal extracting unit extracting the source component signal of each of the channels based on the correlation between the channel signals; a first signal output unit outputting the modified ambient component signal and the source component signal; and a second signal output unit outputting the audio signal or the source component signal.
    Type: Grant
    Filed: September 8, 2008
    Date of Patent: April 16, 2013
    Assignee: LG Electronics Inc.
    Inventors: Hyen-O Oh, Myung Hoon Lee, Yang Won Jung, Chirstof Faller
  • Patent number: 8385556
    Abstract: A system for generating parametric stereo data from phase modulated stereo data is provided. A phase difference system receives left channel data and right channel data and determines a phase difference between the left channel data and the right channel data. A phase difference weighting system receives the phase difference data and generates weighting data to adjust left channel amplitude data and right channel amplitude data based on the phase difference data. A magnitude modification system adjusts the left channel amplitude data and the right channel amplitude data using the weighting data to eliminate phase data in the left channel data and the right channel data.
    Type: Grant
    Filed: August 15, 2008
    Date of Patent: February 26, 2013
    Assignee: DTS, Inc.
    Inventors: Aaron Warner, Jeffrey Thompson, Robert Reams
  • Patent number: 8340315
    Abstract: The invention relates to an assembly of acoustic transducers, a system and a method for receiving and reproducing sound. The assembly comprises a first acoustic transducer having a directional pattern of the shape of a figure of eight in the direction of an X axis of a XYZ coordinate system, and a second acoustic transducer placed perpendicularly relative to a first capsule and providing a directional pattern of the shape of a figure of eight in the direction of a Y axis of a XYZ coordinate system. The assembly is characterized in that it further comprises a third acoustic transducer placed perpendicularly relative to the first and second acoustic transducers, enabling the implementation of spatial sound both in a XY plane and in a XYZ plane by using these acoustic transducers placed in accordance with an axis of the axes of the XYZ coordinate system. The invention further provides a system and a method for processing signals received with the assembly.
    Type: Grant
    Filed: May 26, 2006
    Date of Patent: December 25, 2012
    Assignee: Oy Martin Kantola Consulting Ltd
    Inventor: Martin Kantola
  • Patent number: 8340305
    Abstract: Audio encoding method and device comprising the transmission, in addition to the data representing a frequency-limited signal, of information relating to a temporal filter that is to be applied to the entire enhanced signal, both in its transmitted low-frequency part and in its reconstituted high-frequency part. The application of this filter for reshaping the reconstituted high-frequency part and the correction of compression artefacts present in the transmitted low-frequency part. In this way, the application of the temporal filter, simple and inexpensive, to all or part of the reconstituted signal, makes it possible to obtain a signal of good perceived quality.
    Type: Grant
    Filed: December 28, 2007
    Date of Patent: December 25, 2012
    Assignee: Mobiclip
    Inventor: Alexandre Delattre
  • Patent number: 8195316
    Abstract: An audio apparatus includes an input unit for inputting stereo signals in which multi-channel surround-sound signals are mixed in accordance with a predetermined algorithm and a parameter indicating encoded contents of the algorithm, a surround-sound signal generator for generating left-side surround-sound signals and right-side surround-sound signals by decorrelating left-side signals and right-side signals contained in the stereo signals, and a controller for controlling the decorrelation performed by the surround-sound signal generator based on the parameter.
    Type: Grant
    Filed: January 25, 2008
    Date of Patent: June 5, 2012
    Assignee: Alpine Electronics, Inc.
    Inventor: Noriyuki Takashima
  • 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: 8086448
    Abstract: Processing an audio signal associated with a sound recording made available to be rendered to an end user is disclosed. The audio signal is received. A high-order perceptual attribute of the audio signal as rendered is changed by modifying the audio signal. The modification may be based on real-time analysis of the audio signal.
    Type: Grant
    Filed: March 29, 2004
    Date of Patent: December 27, 2011
    Assignee: Creative Technology Ltd
    Inventors: Michael Goodwin, Carlos Avendano, Ramkumar Sridharan, Martin Wolters
  • Publication number: 20110249820
    Abstract: The disclosed subject matter relates to an architecture that can facilitate generation of enhanced spatial effects for stereo audio systems. Such can be accomplished by integrating on top ambience signal boosting employed in conventional systems. In particular, the ambience signal can be transformed according to a time-dependent function, which can simulate the auditory impressions of a real-world listening environment that may contain static, regularly moving, and/or irregular moving elements.
    Type: Application
    Filed: April 8, 2010
    Publication date: October 13, 2011
    Applicant: CITY UNIVERSITY OF HONG KONG
    Inventor: Peter Wai Ming Tsang
  • Patent number: 8027480
    Abstract: A method and circuit for deriving a set of multichannel audio signals from a conventional monaural or stereo audio signal uses an auxiliary multichannel spectral mapping data stream. Audio can be played back in stereo and multichannel formats from a conventional stereo signal on compact discs, FM radio, or other stereo or monaural delivery systems. The invention reduces the data rate needed for the transmission of multichannel digital audio.
    Type: Grant
    Filed: May 8, 2007
    Date of Patent: September 27, 2011
    Inventor: Terry D. Beard
  • Patent number: 7965849
    Abstract: A method and circuit for deriving a set of multichannel audio signals from a conventional monaural or stereo audio signal uses an auxiliary multichannel spectral mapping data stream. Audio can be played back in stereo and multichannel formats from a conventional stereo signal on compact discs, FM radio, or other stereo or monaural delivery systems. The invention reduces the data rate needed for the transmission of multichannel digital audio.
    Type: Grant
    Filed: May 8, 2007
    Date of Patent: June 21, 2011
    Inventor: Terry D. Beard
  • Patent number: 7876905
    Abstract: A method and circuit for deriving a set of multichannel audio signals from a conventional monaural or stereo audio signal uses an auxiliary multichannel spectral mapping data stream. Audio can be played back in stereo and multichannel formats from a conventional stereo signal on compact discs, FM radio, or other stereo or monaural delivery systems. The invention reduces the data rate needed for the transmission of multichannel digital audio.
    Type: Grant
    Filed: May 8, 2007
    Date of Patent: January 25, 2011
    Inventor: Terry D. Beard
  • Patent number: 7876904
    Abstract: Inputting of a parametrically encoded audio signal comprising at least one combined signal of a plurality of audio channels and one or more corresponding sets of side information describing a multi-channel sound image and including channel configuration information is shown along with deriving, from the channel configuration information, audio source location data describing at least one of horizontal and vertical positions of audio sources in the binaural audio signal; selecting, from a predetermined set of head-related transfer function filters, a left-right pair of head-related transfer function filters matching closest to the audio source location data, wherein the left-right pair of head-related transfer function filters is searched in a stepwise motion in a horizontal plane; and synthesizing a binaural audio signal from the at least one processed signal according to side information and the channel configuration information.
    Type: Grant
    Filed: July 8, 2006
    Date of Patent: January 25, 2011
    Assignee: Nokia Corporation
    Inventors: Pasi Ojala, Julia Turku
  • Patent number: 7873171
    Abstract: A method and circuit for deriving a set of multichannel audio signals from a conventional monaural or stereo audio signal uses an auxiliary multichannel spectral mapping data stream. Audio can be played back in stereo and multichannel formats from a conventional stereo signal on compact discs, FM radio, or other stereo or monaural delivery systems. The invention reduces the data rate needed for the transmission of multichannel digital audio.
    Type: Grant
    Filed: May 8, 2007
    Date of Patent: January 18, 2011
    Inventor: Terry D. Beard
  • Patent number: 7864964
    Abstract: A method and circuit for deriving a set of multichannel audio signals from a conventional monaural or stereo audio signal uses an auxiliary multichannel spectral mapping data stream. Audio can be played back in stereo and multichannel formats from a conventional stereo signal on compact discs, FM radio, or other stereo or monaural delivery systems. The invention reduces the data rate needed for the transmission of multichannel digital audio.
    Type: Grant
    Filed: May 8, 2007
    Date of Patent: January 4, 2011
    Inventor: Terry D. Beard
  • Patent number: 7864966
    Abstract: A method and circuit for deriving a set of multichannel audio signals from a conventional monaural or stereo audio signal uses an auxiliary multichannel spectral mapping data stream. Audio can be played back in stereo and multichannel formats from a conventional stereo signal on compact discs, FM radio, or other stereo or monaural delivery systems. The invention reduces the data rate needed for the transmission of multichannel digital audio.
    Type: Grant
    Filed: May 8, 2007
    Date of Patent: January 4, 2011
    Inventor: Terry D. Beard
  • Patent number: 7864965
    Abstract: A method and circuit for deriving a set of multichannel audio signals from a conventional monaural or stereo audio signal uses an auxiliary multichannel spectral mapping data stream. Audio can be played back in stereo and multichannel formats from a conventional stereo signal on compact discs, FM radio, or other stereo or monaural delivery systems. The invention reduces the data rate needed for the transmission of multichannel digital audio.
    Type: Grant
    Filed: May 8, 2007
    Date of Patent: January 4, 2011
    Inventor: Terry D. Beard
  • Patent number: 7831434
    Abstract: An audio encoder receives multi-channel audio data comprising a group of plural source channels and performs channel extension coding, which comprises encoding a combined channel for the group and determining plural parameters for representing individual source channels of the group as modified versions of the encoded combined channel. The encoder also performs frequency extension coding. The frequency extension coding can comprise, for example, partitioning frequency bands in the multi-channel audio data into a baseband group and an extended band group, and coding audio coefficients in the extended band group based on audio coefficients in the baseband group. The encoder also can perform other kinds of transforms. An audio decoder performs corresponding decoding and/or additional processing tasks, such as a forward complex transform.
    Type: Grant
    Filed: January 20, 2006
    Date of Patent: November 9, 2010
    Assignee: Microsoft Corporation
    Inventors: Sanjeev Mehrotra, Wei-Ge Chen
  • Patent number: 7801314
    Abstract: In an audio signal encoding apparatus, a first audio signal and a second audio signal are added into an addition-result signal. The first audio signal is subtracted from the second audio signal to generate a subtraction-result signal. A first difference signal is generated which represents a difference in the addition-result signal. A second difference signal is generated which represents a difference in the subtraction-result signal. A plurality of first predictors have different prediction characteristics respectively, and are responsive to the first difference signal for generating first different prediction signals for the first difference signal, respectively. A plurality of first subtracters operate for generating first prediction-error signals representing differences between the first difference signal and the first different prediction signals, respectively. A first minimum prediction-error signal representative of a smallest difference is selected from among the first prediction-error signals.
    Type: Grant
    Filed: September 29, 2006
    Date of Patent: September 21, 2010
    Assignee: Victor Company of Japan, Ltd.
    Inventors: Norihiko Fuchigami, Shoji Ueno, Yoshiaki Tanaka
  • Patent number: 7796765
    Abstract: A method and circuit for deriving a set of multichannel audio signals from a conventional monaural or stereo audio signal uses an auxiliary multichannel spectral mapping data stream. Audio can be played back in stereo and multichannel formats from a conventional stereo signal on compact discs, FM radio, or other stereo or monaural delivery systems. The invention reduces the data rate needed for the transmission of multichannel digital audio.
    Type: Grant
    Filed: May 8, 2007
    Date of Patent: September 14, 2010
    Inventor: Terry D. Beard
  • Patent number: 7792304
    Abstract: A method and circuit for deriving a set of multichannel audio signals from a conventional monaural or stereo audio signal uses an auxiliary multichannel spectral mapping data stream. Audio can be played back in stereo and multichannel formats from a conventional stereo signal on compact discs, FM radio, or other stereo or monaural delivery systems. The invention reduces the data rate needed for the transmission of multichannel digital audio.
    Type: Grant
    Filed: May 8, 2007
    Date of Patent: September 7, 2010
    Inventor: Terry D. Beard
  • Patent number: 7792308
    Abstract: A method and circuit for deriving a set of multichannel audio signals from a conventional monaural or stereo audio signal uses an auxiliary multichannel spectral mapping data stream. Audio can be played back in stereo and multichannel formats from a conventional stereo signal on compact discs, FM radio, or other stereo or monaural delivery systems. The invention reduces the data rate needed for the transmission of multichannel digital audio.
    Type: Grant
    Filed: May 8, 2007
    Date of Patent: September 7, 2010
    Inventor: Terry D. Beard
  • Patent number: 7792305
    Abstract: A method and circuit for deriving a set of multichannel audio signals from a conventional monaural or stereo audio signal uses an auxiliary multichannel spectral mapping data stream. Audio can be played back in stereo and multichannel formats from a conventional stereo signal on compact discs, FM radio, or other stereo or monaural delivery systems. The invention reduces the data rate needed for the transmission of multichannel digital audio.
    Type: Grant
    Filed: May 8, 2007
    Date of Patent: September 7, 2010
    Inventor: Terry D. Beard
  • Patent number: 7792306
    Abstract: A method and circuit for deriving a set of multichannel audio signals from a conventional monaural or stereo audio signal uses an auxiliary multichannel spectral mapping data stream. Audio can be played back in stereo and multichannel formats from a conventional stereo signal on compact discs, FM radio, or other stereo or monaural delivery systems. The invention reduces the data rate needed for the transmission of multichannel digital audio.
    Type: Grant
    Filed: May 8, 2007
    Date of Patent: September 7, 2010
    Inventor: Terry D. Beard
  • Patent number: 7792307
    Abstract: A method and circuit for deriving a set of multichannel audio signals from a conventional monaural or stereo audio signal uses an auxiliary multichannel spectral mapping data stream. Audio can be played back in stereo and multichannel formats from a conventional stereo signal on compact discs, FM radio, or other stereo or monaural delivery systems. The invention reduces the data rate needed for the transmission of multichannel digital audio.
    Type: Grant
    Filed: May 8, 2007
    Date of Patent: September 7, 2010
    Inventor: Terry D. Beard
  • Patent number: 7787632
    Abstract: The invention relates to methods and units supporting a multichannel audio extension. In order to allow an efficient extension requiring a low computational complexity, it is proposed that at an encoding end, at least state information is provided as side information for a provided mono audio signal (M) generated out of a multichannel audio signal. The state information indicates for each of a plurality of frequency bands how a predetermined or equally provided gain value is to be applied in the frequency domain to the mono audio signal (M) for obtaining first and a second channel signals (L,R) of a reconstructed multichannel audio signal.
    Type: Grant
    Filed: March 21, 2003
    Date of Patent: August 31, 2010
    Assignee: Nokia Corporation
    Inventor: Juha Ojanpera
  • Patent number: 7783052
    Abstract: A method and circuit for deriving a set of multichannel audio signals from a conventional monaural or stereo audio signal uses an auxiliary multichannel spectral mapping data stream. Audio can be played back in stereo and multichannel formats from a conventional stereo signal on compact discs, FM radio, or other stereo or monaural delivery systems. The invention reduces the data rate needed for the transmission of multichannel digital audio.
    Type: Grant
    Filed: May 8, 2007
    Date of Patent: August 24, 2010
    Inventor: Terry D. Beard
  • Patent number: 7773757
    Abstract: A method and circuit for deriving a set of multichannel audio signals from a conventional monaural or stereo audio signal uses an auxiliary multichannel spectral mapping data stream. Audio can be played back in stereo and multichannel formats from a conventional stereo signal on compact discs, FM radio, or other stereo or monaural delivery systems. The invention reduces the data rate needed for the transmission of multichannel digital audio.
    Type: Grant
    Filed: May 8, 2007
    Date of Patent: August 10, 2010
    Inventor: Terry D. Beard
  • Patent number: 7773758
    Abstract: A method and circuit for deriving a set of multichannel audio signals from a conventional monaural or stereo audio signal uses an auxiliary multichannel spectral mapping data stream. Audio can be played back in stereo and multichannel formats from a conventional stereo signal on compact discs, FM radio, or other stereo or monaural delivery systems. The invention reduces the data rate needed for the transmission of multichannel digital audio.
    Type: Grant
    Filed: May 8, 2007
    Date of Patent: August 10, 2010
    Inventor: Terry D. Beard