4-2-4 Patents (Class 381/21)
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Patent number: 11877140Abstract: An audio processing system and method which calculates, based on spatial metadata of the audio object, a panning coefficient for each of the audio objects in relation to each of a plurality of predefined channel coverage zones. Converts the audio signal into submixes in relation to the predefined channel coverage zones based on the calculated panning coefficients and the audio objects. Each of the submixes indicating a sum of components of the plurality of the audio objects in relation to one of the predefined channel coverage zones. Generating a submix gain by applying an audio processing to each of the submix and controls an object gain applied to each of the audio objects. The object gain being as a function of the panning coefficients for each of the audio objects and the submix gains in relation to each of the predefined channel coverage zones.Type: GrantFiled: October 10, 2022Date of Patent: January 16, 2024Assignee: DOLBY LABORATORIES LICENSING CORPORATIONInventors: Alan J. Seefeldt, Lie Lu, Chen Zhang
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Patent number: 10237652Abstract: 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: GrantFiled: October 24, 2014Date of Patent: March 19, 2019Assignee: PIONEER CORPORATIONInventor: Akihiro Iseki
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Patent number: 9197978Abstract: 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: GrantFiled: March 25, 2010Date of Patent: November 24, 2015Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.Inventors: Hikaru Usami, Naoya Tanaka, Toshihiko Date
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Patent number: 9042558Abstract: 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: GrantFiled: October 1, 2008Date of Patent: May 26, 2015Assignee: GVBB Holdings S.A.R.L.Inventor: Yousuke Takada
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Patent number: 9025775Abstract: 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: GrantFiled: July 1, 2008Date of Patent: May 5, 2015Assignee: Nokia CorporationInventor: Pasi Ojala
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Publication number: 20140362997Abstract: 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: ApplicationFiled: August 25, 2014Publication date: December 11, 2014Inventors: Andrea BASSO, Zhu LIU, Bernard S. Renger, Behzad SHAHRARAY
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Patent number: 8824689Abstract: 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: GrantFiled: February 11, 2011Date of Patent: September 2, 2014Assignee: Fraunhofer-Gesellschaft zur Foerderung der Angewandten Forschung E.V.Inventors: Sascha Disch, Ville Pulkki, Mikko-Ville Laitinen, Cumhur Erkut
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Patent number: 8804971Abstract: 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: GrantFiled: August 27, 2013Date of Patent: August 12, 2014Assignees: Dolby International AB, Dolby Laboratories Licensing CorporationInventors: Phillip A. Williams, Michael Schug, Robin Thesing
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Patent number: 8804970Abstract: 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: GrantFiled: January 11, 2011Date of Patent: August 12, 2014Assignee: 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
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Patent number: 8768691Abstract: 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: GrantFiled: March 23, 2006Date of Patent: July 1, 2014Assignee: Panasonic CorporationInventor: Koji Yoshida
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Patent number: 8705779Abstract: 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: GrantFiled: June 29, 2009Date of Patent: April 22, 2014Assignee: Samsung Electronics Co., Ltd.Inventors: Kang Eun Lee, Do-Hyung Kim, Chang Yong Son
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Patent number: 8693697Abstract: 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: GrantFiled: December 16, 2011Date of Patent: April 8, 2014Assignee: Reality IP Pty LtdInventor: Charlie Corneles Van Dongen
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Patent number: 8625810Abstract: 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: GrantFiled: February 7, 2007Date of Patent: January 7, 2014Assignee: LG Electronics, Inc.Inventors: Yang Won Jung, Hee Suk Pang, Hyen O Oh, Dong Soo Kim, Jae Hyun Lim
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Patent number: 8625811Abstract: 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: GrantFiled: February 6, 2012Date of Patent: January 7, 2014Assignee: SAMSUNG Electronics Co., Ltd.Inventors: Ki-hyun Choo, Eun-mi Oh, Jung-hoe Kim, Boris Kudryashov, Sergey Petrov
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Patent number: 8611545Abstract: 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: GrantFiled: March 26, 2009Date of Patent: December 17, 2013Assignee: Alpine Electronics, Inc.Inventor: Noriyuki Takashima
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Patent number: 8605912Abstract: 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: GrantFiled: April 22, 2011Date of Patent: December 10, 2013Assignee: Conexant Systems, Inc.Inventors: Mouna Elkhatib, Jimmy Pu
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Patent number: 8600532Abstract: 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: GrantFiled: December 9, 2008Date of Patent: December 3, 2013Assignee: LG Electronics Inc.Inventors: Hyen-O Oh, Yang Won Jung
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Patent number: 8595017Abstract: 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: GrantFiled: December 27, 2007Date of Patent: November 26, 2013Assignee: MobiclipInventor: Alexandre Delattre
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Patent number: 8588947Abstract: An apparatus for processing an audio signal and method thereof are disclosed.Type: GrantFiled: October 13, 2009Date of Patent: November 19, 2013Assignee: LG Electronics Inc.Inventors: Hyen-O Oh, Yang Won Jung
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Publication number: 20130223633Abstract: 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: ApplicationFiled: October 17, 2011Publication date: August 29, 2013Applicant: PANASONIC CORPORATIONInventors: Masahiro Oshikiri, Hiroyuki Ehara
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Patent number: 8503683Abstract: 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: GrantFiled: February 7, 2007Date of Patent: August 6, 2013Assignee: LG Electronics, Inc.Inventors: Yang Won Jung, Hee Suk Pang, Hyen O Oh, Dong Soo Kim, Jae Hyun Lim
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Patent number: 8467549Abstract: 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: GrantFiled: August 14, 2007Date of Patent: June 18, 2013Assignee: Canon Kabushiki KaishaInventor: Taizo Hori
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Patent number: 8428267Abstract: 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: GrantFiled: December 7, 2007Date of Patent: April 23, 2013Assignee: LG Electronics Inc.Inventors: Hyen-O Oh, Yang-Won Jung
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Patent number: 8422688Abstract: 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: GrantFiled: September 8, 2008Date of Patent: April 16, 2013Assignee: LG Electronics Inc.Inventors: Hyen-O Oh, Myung Hoon Lee, Yang Won Jung, Chirstof Faller
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Patent number: 8385556Abstract: 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: GrantFiled: August 15, 2008Date of Patent: February 26, 2013Assignee: DTS, Inc.Inventors: Aaron Warner, Jeffrey Thompson, Robert Reams
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Patent number: 8340315Abstract: 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: GrantFiled: May 26, 2006Date of Patent: December 25, 2012Assignee: Oy Martin Kantola Consulting LtdInventor: Martin Kantola
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Patent number: 8340305Abstract: 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: GrantFiled: December 28, 2007Date of Patent: December 25, 2012Assignee: MobiclipInventor: Alexandre Delattre
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Patent number: 8195316Abstract: 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: GrantFiled: January 25, 2008Date of Patent: June 5, 2012Assignee: Alpine Electronics, Inc.Inventor: Noriyuki Takashima
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Patent number: 8111829Abstract: 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: GrantFiled: October 23, 2007Date of Patent: February 7, 2012Assignee: Samsung Electronics Co., Ltd.Inventors: Ki-hyun Choo, Eun-mi Oh, Jung-hoe Kim, Boris Kudryashov, Sergey Petrov
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Patent number: 8086448Abstract: 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: GrantFiled: March 29, 2004Date of Patent: December 27, 2011Assignee: Creative Technology LtdInventors: Michael Goodwin, Carlos Avendano, Ramkumar Sridharan, Martin Wolters
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Publication number: 20110249820Abstract: 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: ApplicationFiled: April 8, 2010Publication date: October 13, 2011Applicant: CITY UNIVERSITY OF HONG KONGInventor: Peter Wai Ming Tsang
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Patent number: 8027480Abstract: 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: GrantFiled: May 8, 2007Date of Patent: September 27, 2011Inventor: Terry D. Beard
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Patent number: 7965849Abstract: 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: GrantFiled: May 8, 2007Date of Patent: June 21, 2011Inventor: Terry D. Beard
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Patent number: 7876905Abstract: 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: GrantFiled: May 8, 2007Date of Patent: January 25, 2011Inventor: Terry D. Beard
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Patent number: 7876904Abstract: 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: GrantFiled: July 8, 2006Date of Patent: January 25, 2011Assignee: Nokia CorporationInventors: Pasi Ojala, Julia Turku
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Patent number: 7873171Abstract: 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: GrantFiled: May 8, 2007Date of Patent: January 18, 2011Inventor: Terry D. Beard
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Patent number: 7864966Abstract: 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: GrantFiled: May 8, 2007Date of Patent: January 4, 2011Inventor: Terry D. Beard
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Patent number: 7864964Abstract: 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: GrantFiled: May 8, 2007Date of Patent: January 4, 2011Inventor: Terry D. Beard
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Patent number: 7864965Abstract: 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: GrantFiled: May 8, 2007Date of Patent: January 4, 2011Inventor: Terry D. Beard
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Patent number: 7831434Abstract: 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: GrantFiled: January 20, 2006Date of Patent: November 9, 2010Assignee: Microsoft CorporationInventors: Sanjeev Mehrotra, Wei-Ge Chen
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Patent number: 7801314Abstract: 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: GrantFiled: September 29, 2006Date of Patent: September 21, 2010Assignee: Victor Company of Japan, Ltd.Inventors: Norihiko Fuchigami, Shoji Ueno, Yoshiaki Tanaka
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Patent number: 7796765Abstract: 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: GrantFiled: May 8, 2007Date of Patent: September 14, 2010Inventor: Terry D. Beard
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Patent number: 7792305Abstract: 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: GrantFiled: May 8, 2007Date of Patent: September 7, 2010Inventor: Terry D. Beard
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Patent number: 7792306Abstract: 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: GrantFiled: May 8, 2007Date of Patent: September 7, 2010Inventor: Terry D. Beard
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Patent number: 7792308Abstract: 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: GrantFiled: May 8, 2007Date of Patent: September 7, 2010Inventor: Terry D. Beard
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Patent number: 7792307Abstract: 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: GrantFiled: May 8, 2007Date of Patent: September 7, 2010Inventor: Terry D. Beard
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Patent number: 7792304Abstract: 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: GrantFiled: May 8, 2007Date of Patent: September 7, 2010Inventor: Terry D. Beard
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Patent number: 7787632Abstract: 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: GrantFiled: March 21, 2003Date of Patent: August 31, 2010Assignee: Nokia CorporationInventor: Juha Ojanpera
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Patent number: 7783052Abstract: 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: GrantFiled: May 8, 2007Date of Patent: August 24, 2010Inventor: Terry D. Beard
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Patent number: 7773756Abstract: 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: GrantFiled: October 25, 2005Date of Patent: August 10, 2010Inventor: Terry D. Beard