With Encoder Patents (Class 381/23)
  • Patent number: 10244339
    Abstract: The encoding and decoding of HOA signals using Singular Value Decomposition includes forming based on sound source direction values and an Ambisonics order corresponding ket vectors (|Y(?s)) of spherical harmonics and an encoder mode matrix (?O×S). From the audio input signal (|x(?s)) a singular threshold value (?S) determined. On the encoder mode matrix a Singular Value Decomposition is carried out in order to get related singular values which are compared with the threshold value, leading to a final encoder mode matrix rank (rfins). Based on direction values (?l) of loudspeakers and a decoder Ambisonics order (Nl), corresponding ket vectors (|Y(?l)) and a decoder mode matrix (?O×L) are formed. On the decoder mode matrix a Singular Value Decomposition is carried out, providing a final decoder mode matrix rank (rfind).
    Type: Grant
    Filed: August 14, 2017
    Date of Patent: March 26, 2019
    Assignee: Dolby International AB
    Inventors: Holger Kropp, Stefan Abeling
  • Patent number: 10147437
    Abstract: Higher Order Ambisonics represents three-dimensional sound independent of a specific loudspeaker set-up. However, transmission of an HOA representation results in a very high bit rate. Therefore compression with a fixed number of channels is used, in which directional and ambient signal components are processed differently. For coding, portions of the original HOA representation are predicted from the directional signal components. This prediction provides side information which is required for a corresponding decoding. By using some additional specific purpose bits, a known side information coding processing is improved in that the required number of bits for coding that side information is reduced on average.
    Type: Grant
    Filed: April 18, 2018
    Date of Patent: December 4, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Alexander Krueger, Sven Kordon, Oliver Wuebbolt
  • Patent number: 10121487
    Abstract: A signaling processor is provided. The signaling processor includes a frequency domain processing module configured to generate a cut-off frequency of an input signal and to generate level information for adjusting a level of a high frequency recovery signal and a time domain processing module configured to receive the cut-off frequency and the level information from the frequency domain processing module, to generate a signal having a frequency greater than or equal to the cut-off frequency using part of a signal of a frequency lower than the cut-off frequency in the input signal, to generate the high frequency recovery signal by adjusting a level of the generated signal using the level information, and to synthesize the high frequency recovery signal with the input signal.
    Type: Grant
    Filed: November 15, 2017
    Date of Patent: November 6, 2018
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Anant Baijal, Hyeon Sik Jeong, Byeong Seob Ko, Hyunjoo Chung, Sang Mo Son
  • Patent number: 10070243
    Abstract: Audio content coded for a reference speaker configuration is downmixed to downmix audio content coded for a specific speaker configuration. One or more gain adjustments are performed on individual portions of the downmix audio content coded for the specific speaker configuration. Loudness measurements are then performed on the individual portions of the downmix audio content. An audio signal that comprises the audio content coded for the reference speaker configuration and downmix loudness metadata is generated. The downmix loudness metadata is created based at least in part on the loudness measurements on the individual portions of the downmix audio content.
    Type: Grant
    Filed: June 16, 2017
    Date of Patent: September 4, 2018
    Assignees: Dolby Laboratories Licensing Corporation, Dolby International AB
    Inventors: Michael Ward, Jeffrey Riedmiller, Scott Gregory Norcross, Alexander Groeschel
  • Patent number: 10032459
    Abstract: Provided is a method and apparatus for encoding/decoding an audio signal. Sections which are not used to output noise components near important spectral components and sub-bands which are not used to output noise components, are determined to be encoded or decoded, so that the efficiency of encoding and decoding an audio signal increases, and sound quality can be improved using less bits.
    Type: Grant
    Filed: February 6, 2017
    Date of Patent: July 24, 2018
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Eun-mi Oh, Anton Porov, Jung-hoe Kim
  • Patent number: 10003907
    Abstract: Diffuse or spatially large audio objects may be identified for special processing. A decorrelation process may be performed on audio signals corresponding to the large audio objects to produce decorrelated large audio object audio signals. These decorrelated large audio object audio signals may be associated with object locations, which may be stationary or time-varying locations. For example, the decorrelated large audio object audio signals may be rendered to virtual or actual speaker locations. The output of such a rendering process may be input to a scene simplification process. The decorrelation, associating and/or scene simplification processes may be performed prior to a process of encoding the audio data.
    Type: Grant
    Filed: April 18, 2017
    Date of Patent: June 19, 2018
    Assignees: Dolby Laboratories Licensing Corporation, Dolby International AB
    Inventors: Dirk Jeroen Breebaart, Lie Lu, Nicolas R. Tsingos, Antonio Mateos Sole
  • Patent number: 9955278
    Abstract: The present document relates to the field of encoding and decoding of audio. In particular, the present document relates to encoding and decoding of an audio scene comprising audio objects. A method (400) for encoding metadata relating to a plurality of audio objects (106a) of an audio scene (102) is described. The metadata comprises a first set (114, 314) of metadata and a second set (104) of metadata. The first and second sets (104, 114, 314) of metadata comprise one or more data elements which are indicative of a property of an audio object (106a) from the plurality of audio objects (106a) and/or of a downmix signal (112) derived from the plurality of audio objects (106a). The method (400) comprises identifying (401) a redundant data element which is common to the first and second sets (104, 114, 314) of metadata.
    Type: Grant
    Filed: April 1, 2015
    Date of Patent: April 24, 2018
    Assignee: Dolby International AB
    Inventors: Christof Fersch, Heiko Purnhagen, Jens Popp, Martin Wolters
  • Patent number: 9883308
    Abstract: Disclosed are a multi-channel audio signal processing method and a multi-channel audio signal processing apparatus. The multi-channel audio signal processing method may generate N channel output signals from N/2 channel downmix signals based on an N-N/2-N structure.
    Type: Grant
    Filed: July 1, 2015
    Date of Patent: January 30, 2018
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Seung Kwon Beack, Jeong Il Seo, Jong Mo Sung, Tae Jin Lee, Dae Young Jang, Jin Woong Kim
  • Patent number: 9847088
    Abstract: In general, techniques are directed to intermediate compression of higher order ambisonic audio data. For example, a device comprising a processor and a memory may be configured to perform the techniques. The memory may be configured to store an intermediately formatted audio data generated as a result of an intermediate compression of higher order ambisonic audio data. The one or more processors may be configured to process the intermediately formatted audio data.
    Type: Grant
    Filed: August 27, 2015
    Date of Patent: December 19, 2017
    Assignee: QUALCOMM Incorporated
    Inventors: Nils Günther Peters, Dipanjan Sen
  • Patent number: 9818415
    Abstract: A method for selecting a subset of channels of (e.g., determined from) at least a segment of a multichannel audio program for watermarking and watermarking the selected subset of channels, and a system or device configured to implement any embodiment of the method, or including a buffer which stores at least one frame or other segment of a multichannel audio program generated by any embodiment of the method or steps thereof. Some embodiments generate watermarking metadata during program creation including by analyzing audio content to be included in segments of a multichannel program, determining at least one watermark suitability value for each channel of each of the segments, and including the watermark suitability values (or watermarking data determined therefrom) as metadata in the program. Some embodiments are implemented by a playback system which determines the selected subset of channels to be watermarked.
    Type: Grant
    Filed: September 9, 2014
    Date of Patent: November 14, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Dossym Nurmukhanov, Sripal S. Mehta, Dirk Jeroen Breebaart
  • Patent number: 9685163
    Abstract: In general, techniques are described for transforming spherical harmonic coefficients. A device comprising one or more processors may perform the techniques. The processors may be configured to parse the bitstream to determine transformation information describing how the sound field was transformed to reduce a number of the plurality of hierarchical elements that provide information relevant in describing the sound field. The processors may further be configured to, when reproducing the sound field based on those of the plurality of hierarchical elements that provide information relevant in describing the sound field, transform the sound field based on the transformation information to reverse the transformation performed to reduce the number of the plurality of hierarchical elements.
    Type: Grant
    Filed: February 27, 2014
    Date of Patent: June 20, 2017
    Assignee: QUALCOMM Incorporated
    Inventors: Dipanjan Sen, Martin James Morrell, Nils Günther Peters
  • Patent number: 9686624
    Abstract: Audio content coded for a reference speaker configuration is downmixed to downmix audio content coded for a specific speaker configuration. One or more gain adjustments are performed on individual portions of the downmix audio content coded for the specific speaker configuration. Loudness measurements are then performed on the individual portions of the downmix audio content. An audio signal that comprises the audio content coded for the reference speaker configuration and downmix loudness metadata is generated. The downmix loudness metadata is created based at least in part on the loudness measurements on the individual portions of the downmix audio content.
    Type: Grant
    Filed: April 5, 2016
    Date of Patent: June 20, 2017
    Assignees: Dolby Laboratories Licensing Corporation, Dolby International AB
    Inventors: Michael Ward, Jeffrey Riedmiller, Scott Gregory Norcross, Alexander Groeschel
  • Patent number: 9681247
    Abstract: Disclosed is a non-transitory computer readable storage medium which receives, by an audio decoder (operating in a specific playback environment different from a reference channel configuration), an audio signal for the reference channel configuration. The audio signal includes audio sample data and encoder-generated loudness metadata which includes a plurality of portions of loudness metadata for a plurality of playback environments. The plurality of portions of loudness metadata includes one or more respective portions of loudness metadata for each playback environment in the plurality of playback environments. The medium also selects one or more portions of specific loudness metadata (based on the specific playback environment), from among the plurality of portions of loudness metadata for the plurality of playback environments.
    Type: Grant
    Filed: April 5, 2016
    Date of Patent: June 13, 2017
    Assignees: Dolby Laboratories Licensing Corporation, Dolby International AB
    Inventors: Michael Ward, Jeffrey Riedmiller, Scott Gregory Norcross, Alexander Groeschel
  • Patent number: 9654895
    Abstract: Diffuse or spatially large audio objects may be identified for special processing. A decorrelation process may be performed on audio signals corresponding to the large audio objects to produce decorrelated large audio object audio signals. These decorrelated large audio object audio signals may be associated with object locations, which may be stationary or time-varying locations. For example, the decorrelated large audio object audio signals may be rendered to virtual or actual speaker locations. The output of such a rendering process may be input to a scene simplification process. The decorrelation, associating and/or scene simplification processes may be performed prior to a process of encoding the audio data.
    Type: Grant
    Filed: July 24, 2014
    Date of Patent: May 16, 2017
    Assignees: Dolby Laboratories Licensing Corporation, Dolby International AB
    Inventors: Dirk Jeroen Breebaart, Lie Lu, Nicolas R. Tsingos, Antonio Mateos Sole
  • Patent number: 9596544
    Abstract: A device having first means for directing a sound wave to a first side of a target head location; a first means for encircling the first directing means, being configured to phase focus the sound wave to a proximate center point of a left ear of the listener; a second means for directing the sound wave to a second side of the target head location of the listener; a second means for encircling the second directing means, being configured to phase focus the sound wave to a proximate center point of a right ear of the listener; and means for encapsulating the first and second encircling means, said encapsulating means being configured to proximately surround the target head location of the listener.
    Type: Grant
    Filed: December 30, 2015
    Date of Patent: March 14, 2017
    Inventor: Gregory Douglas Brotherton
  • Patent number: 9584912
    Abstract: An encoder (501) generates data representing an audio scene by a first downmix and data characterizing audio objects. In addition, a direction dependent diffuseness parameter indicative of a degree of diffuseness of a residual downmix is provided where the residual downmix corresponds to a downmix of audio components of the audio scene with the audio objects being extracted. A rendering apparatus (503) comprises a receiver (701) receiving the data from the encoder (501). A circuit (703) generates signals for a spatial speaker configuration from the audio objects. A transformer (709) generates non-diffuse sound signals for the spatial speaker configuration by applying a first transformation to the residual downmix and another transformer (707) generates signals for the spatial speaker configuration by applying a second transformation to the residual downmix by applying a decorrelation to the residual downmix. The transformations are dependent on the direction dependent diffuseness parameter.
    Type: Grant
    Filed: January 17, 2013
    Date of Patent: February 28, 2017
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventors: Jeroen Gerardus Henricus Koppens, Erik Gosuinus Petrus Schuijers, Arnoldus Werner Johannes Oomen, Leon Maria Van De Kerkhof
  • Patent number: 9564142
    Abstract: Provided is a method and apparatus for encoding/decoding an audio signal. Sections which are not used to output noise components near important spectral components and sub-bands which are not used to output noise components, are determined to be encoded or decoded, so that the efficiency of encoding and decoding an audio signal increases, and sound quality can be improved using less bits.
    Type: Grant
    Filed: October 12, 2015
    Date of Patent: February 7, 2017
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Eun-mi Oh, Anton Porov, Jung-hoe Kim
  • Patent number: 9521501
    Abstract: Audio content coded for a reference speaker configuration is downmixed to downmix audio content coded for a specific speaker configuration. One or more gain adjustments are performed on individual portions of the downmix audio content coded for the specific speaker configuration. Loudness measurements are then performed on the individual portions of the downmix audio content. An audio signal that comprises the audio content coded for the reference speaker configuration and downmix loudness metadata is generated. The downmix loudness metadata is created based at least in part on the loudness measurements on the individual portions of the downmix audio content.
    Type: Grant
    Filed: September 9, 2014
    Date of Patent: December 13, 2016
    Assignees: Dolby Laboratories Licensing Corporation, Dolby International AB
    Inventors: Michael Ward, Jeffrey Riedmiller, Scott Gregory Norcross, Alexander Groeschel
  • Patent number: 9489956
    Abstract: Received audio data may include a first set of frequency coefficients and a second set of frequency coefficients. Spatial parameters for at least part of the second set of frequency coefficients may be estimated, based at least in part on the first set of frequency coefficients. The estimated spatial parameters may be applied to the second set of frequency coefficients to generate a modified second set of frequency coefficients. The first set of frequency coefficients may correspond to a first frequency range (for example, an individual channel frequency range) and the second set of frequency coefficients may correspond to a second frequency range (for example, a coupled channel frequency range). Combined frequency coefficients of a composite coupling channel may be based on frequency coefficients of two or more channels. Cross-correlation coefficients, between frequency coefficients of a first channel and the combined frequency coefficients, may be computed.
    Type: Grant
    Filed: January 22, 2014
    Date of Patent: November 8, 2016
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Matthew Fellers, Vinay Melkote, Kuan-Chieh Yen, Grant A. Davidson, Mark F. Davis
  • Patent number: 9478223
    Abstract: Provided are a multi-channel audio down-mixing method and apparatus for selecting down-mix target channels based on a calculation of correlations between channels and then down-mixing the down-mix target channels. The method includes: calculating correlations between channels of multi-channel audio; selecting a first channel and a second channel, among the channels of the multi-channel audio, that are to be down-mixed, based on the calculated correlations; and down-mixing the selected first channel and the selected second channel.
    Type: Grant
    Filed: April 23, 2010
    Date of Patent: October 25, 2016
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Han-Gil Moon, Chul-Woo Lee
  • Patent number: 9460723
    Abstract: A decoding system reconstructs an audio signal based on an input signal representing the audio signal by parametric coding or by n discretely coded channels. Parametric decoding proceeds on the basis of a core signal and mixing parameters controlling a spatial synthesis stage, which is supplied with a downmix signal. A controller is responsible for controlling the components of the decoding system, whether in steady-state parametric mode, steady-state discrete decoding mode and transitions between these. In defective frames of the input signal, which do not allow the mixing parameters to be decoded, the controller is configured to perform various error handling procedures including: parametric decoding using previous values of the mixing parameters; continuing parametric decoding for a limited duration, and/or outputting the core signal without spatial synthesis.
    Type: Grant
    Filed: June 14, 2013
    Date of Patent: October 4, 2016
    Assignee: Dolby International AB
    Inventors: Tobias Friedrich, Tobias Ro Wagenblass, Karsten Linzmeier, Daniel Homm, Claus-Christian Spenger, Heiko Purnhagen
  • Patent number: 9456286
    Abstract: The present invention proposes a method for operating a binaural hearing system with two hearing devices (1, 1?) operationally interconnected by means of a bidirectional link (8) which improves hearing perception in windy listening situations. The method comprises determining the level of wind noise present at each of the two hearing devices (1, 1?) and sending the audio signal picked-up at the first hearing device (1) to the second hearing device (1?) via the link (8) and then providing an output signal derived from the received signal to the electrical-to-mechanical output converter (3?) of the second hearing device (1?) if the level of wind noise at the second hearing device (1?) exceeds the level of wind noise at the first hearing device (1) by a pre-set threshold value. Furthermore, a binaural hearing system capable of performing such a method is given.
    Type: Grant
    Filed: September 28, 2012
    Date of Patent: September 27, 2016
    Assignee: SONOVA AG
    Inventors: Volker Kuhnel, Ralph Peter Derleth, Raphael Lamon, Alexander Reich
  • Patent number: 9449603
    Abstract: The invention relates to a method for determining an encoding parameter for an audio channel signal of a multi-channel audio signal, the method comprising: determining a frequency transform of the audio channel signal; determining a frequency transform of a reference audio signal; determining inter channel differences for at least each frequency sub-band of a subset of frequency sub-bands, each inter channel difference indicating a phase difference or time difference between a band-limited signal portion of the audio channel signal and a band-limited signal portion of the reference audio signal in the respective frequency sub-band the inter-channel difference is associated to; determining a first average based on positive values of the inter-channel differences and determining a second average based on negative values of the inter-channel differences; and determining the encoding parameter based on the first average and on the second average.
    Type: Grant
    Filed: September 26, 2014
    Date of Patent: September 20, 2016
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: David Virette, Yue Lang, Jianfeng Xu
  • Patent number: 9449604
    Abstract: The invention relates to a method for determining an encoding parameter for an audio channel signal of a multi-channel audio signal, the method comprising: determining for the audio channel signal a set of functions from the audio channel signal and a reference audio signal; determining a first set of encoding parameters based on a smoothing of the set of functions with respect to a frame sequence of the multi-channel audio signal, the smoothing being based on a first smoothing coefficient; determining a second set of encoding parameters based on a smoothing of the set of functions with respect to the frame sequence of the multi-channel audio signal, the smoothing being based on a second smoothing coefficient; and determining the encoding parameter based on a quality criterion with respect to the first set of encoding parameters and/or the second set of encoding parameters.
    Type: Grant
    Filed: September 26, 2014
    Date of Patent: September 20, 2016
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: David Virette, Yue Lang, Jianfeng Xu
  • Patent number: 9368122
    Abstract: An apparatus for generating a decorrelated signal having a receiving unit for receiving phase information, a transient separator, a transient decorrelator, a second decorrelator and a combining unit, wherein the transient separator is adapted to separate an input signal into a first signal component and into a second signal component such that the first signal component has transient signal portions of the input signal and such that the second signal component has non-transient signal portions of the input signal. The transient decorrelator is adapted to apply the phase information received by the receiving unit to a transient signal component.
    Type: Grant
    Filed: April 9, 2014
    Date of Patent: June 14, 2016
    Assignee: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
    Inventors: Achim Kuntz, Sascha Disch, Juergen Herre, Fabian Kuech, Johannes Hilpert
  • Patent number: 9330671
    Abstract: The invention relates to the technical field of audio encoding and/or decoding technologies, and thus concerns an overall encoding procedure and associated decoding procedure. The encoding procedure involves at least two signal encoding processes (S1-S3) operating on signal representations of a set of audio input channels, as well as residual encoding (S7-S8). It also involves a dedicated process (S4-S6) to estimate and encode energies of the audio input channels. Each encoding process is associated with a corresponding decoding process. In the overall decoding procedure the decoded signals from each encoding process are preferably combined such that the output channels are close to the input channels in terms of energy and/or quality. Normally, the combination step also adapts to the possible loss of one or more signal representation in part or in whole, such that the energy and quality is optimized with the signals at hand in the decoder. In this way, the overall quality of the output channels is improved.
    Type: Grant
    Filed: September 25, 2009
    Date of Patent: May 3, 2016
    Assignee: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)
    Inventors: Erik Norvell, Martin Sehlstedt, Anisse Taleb
  • Patent number: 9253572
    Abstract: Methods and systems for providing synthetic audio placement are described herein. In different aspects, the methods and systems may include a connection port to receive a plurality of remote audio signals included in a conference call, at least one of the plurality of remote audio connections being a single channel audio signal, a processor configured with the connection port to provide a sound field for placing the plurality of audio signals, the sound field providing synthetic audio placement of each of the plurality of remote audio signals, and a rendering output configured with the processor to project the plurality of remote audio within the sound field to a listener.
    Type: Grant
    Filed: February 26, 2013
    Date of Patent: February 2, 2016
    Assignee: AT&T Intellectual Property I, L.P.
    Inventors: James Carlton Bedingfield, Sr., Larry D. Woodring
  • Patent number: 9197964
    Abstract: An amplifier unit suitable for a wide variety of uses, which can flexibly support diverse sound recording scenarios, and a mobile electronic device provided with the amplifier unit. An amplifier unit has microphone/line input terminals respectively provided on the topside surface and the left side surface. When a connector is connected to a mobile electronic device, stereophonic sound is recorded using one of the terminals when the mobile electronic device is held in portrait orientation, and using the other terminal when the mobile electronic device is held in landscape orientation. It is possible to switch each of audio signals coming through the two terminals between monophonic and stereophonic.
    Type: Grant
    Filed: January 25, 2013
    Date of Patent: November 24, 2015
    Assignee: TEAC Corporation
    Inventors: Hideaki Gotoh, Kazuki Ida
  • Patent number: 9117459
    Abstract: The application relates to HFR (High Frequency Reconstruction/Regeneration) of audio signals. In particular, the application relates to a method and system for performing HFR of audio signals having large variations in energy level across the low frequency range which is used to reconstruct the high frequencies of the audio signal. A system configured to generate a plurality of high frequency subband signals covering a high frequency interval from a plurality of low frequency subband signals is described.
    Type: Grant
    Filed: July 14, 2011
    Date of Patent: August 25, 2015
    Assignee: Dolby International AB
    Inventor: Kristofer Kjoerling
  • Patent number: 9105264
    Abstract: A coding apparatus which suppresses an extreme increase in a bit rate, includes: a downmixing and coding unit (301) that downmixes audio signals that have been provided, to reduce the number of channels to be fewer than the number of the provided audio signals, and to code the downmix signals; an object parameter extracting unit (304) that extracts parameters indicating correlation between the audio signals; and a multiplexing circuit (309) that multiplexes the extracted parameters with the generated downmix coded signals. The object parameter extracting unit (304) includes: an object classifying unit (305) that classifies each of the provided audio signals into a predetermined one of types based on audio characteristics; and an object parameter extracting circuit (308) that extracts parameters using a temporal granularity and a frequency granularity each of which is determined for a corresponding one of the types.
    Type: Grant
    Filed: July 30, 2010
    Date of Patent: August 11, 2015
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Tomokazu Ishikawa, Takeshi Norimatsu, Kok Seng Chong, Huan Zhou
  • Patent number: 9082396
    Abstract: The invention relates to an audio signal synthesizer, the audio signal synthesizer comprises a transformer for transforming the down-mix audio signal into frequency domain to obtain a transformed audio signal; a signal generator for generating a first auxiliary signal, for generating a second auxiliary signal, and for generating a third auxiliary signal upon the basis of the transformed audio signal; a de-correlator for generating a first de-correlated signal, and for generating a second de-correlated signal from the third auxiliary signal, the first de-correlated signal and the second de-correlated signal being at least partly de-correlated; and a combiner for combining the first auxiliary signal with the first de-correlated signal to obtain a first audio signal, and for combining the second auxiliary signal with the second de-correlated signal to obtain the second audio signal, the first audio signal and the second audio signal forming the multi-channel audio signal.
    Type: Grant
    Filed: January 18, 2013
    Date of Patent: July 14, 2015
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Christof Faller, David Virette, Yue Lang, Jianfeng Xu
  • Patent number: 9071919
    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: Grant
    Filed: October 12, 2011
    Date of Patent: June 30, 2015
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Hwan Shim, Eun-Mi Oh, Mi-Young Kim, Anton V. Porov
  • Patent number: 9070358
    Abstract: An encoder for a multi-channel audio signal which comprises a down-mixer (201, 203, 205) for generating a down-mix as a combination of at least a first and second channel signal weighted by respectively a first and second weight with different amplitudes for at least some time-frequency intervals. Furthermore, a circuit (201, 203, 209) generates up-mix parametric data characterizing a relationship between the channel signals as well as characterizing the weights. A circuit generates weight estimates for the encoder weights from the up-mix parametric data; and comprises an up-mixer (407) which recreates the multi channel audio signal by up-mixing the down-mix in response to the up-mix parametric data, the first weight estimate and the second weight estimate. The up-mixing is dependent on the amplitude of at least one of the weight estimate(s).
    Type: Grant
    Filed: November 5, 2010
    Date of Patent: June 30, 2015
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventors: Albertus Cornelis Den Brinker, Erik Gosuinus Petrus Schuijers, Arnoldus Werner Johanees Oomen
  • Patent number: 9047862
    Abstract: An audio apparatus including a decorrelator for generating decorrelated signals by applying a phase shifting value adjusted based on a correlation difference between audio signals included in a multi-channel signal to the audio signals; and a speaker set including at least two speakers for outputting acoustic signals corresponding to the decorrelated signals.
    Type: Grant
    Filed: May 30, 2012
    Date of Patent: June 2, 2015
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Jae-hoon Jeong, So-young Jeong, Jeong-su Kim, Jung-eun Park, Woo-jung Lee
  • 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: 9042560
    Abstract: A method comprising: sampling received audio at a first rate to produce a first audio signal; transforming the first audio signal into a sparse domain to produce a sparse audio signal; re-sampling of the sparse audio signal to produce a re-sampled sparse audio signal; and providing the re-sampled sparse audio signal, wherein bandwidth required for accurate audio reproduction is removed but bandwidth required for spatial audio encoding is retained AND/OR a method comprising: receiving a first sparse audio signal for a first channel; receiving a second sparse audio signal for a second channel; and processing the first sparse audio signal and the second sparse audio signal to produce one or more inter-channel spatial audio parameters.
    Type: Grant
    Filed: December 23, 2009
    Date of Patent: May 26, 2015
    Assignee: Nokia Corporation
    Inventor: Pasi Ojala
  • Patent number: 9042559
    Abstract: An apparatus for processing an audio signal and method thereof are disclosed. The present invention includes receiving a downmix signal and side information; extracting control restriction information from the side information; receiving control information for controlling gain or panning at least one object signal; generating at least one of first multi-channel information and first downmix processing information based on the control information and object information, without using the control restriction information; and, generating an output signal by applying the at least one of the first multichannel information and the first downmix processing information to the downmix signal, wherein the control restriction information relates to a parameter indicating limiting degree of the control information.
    Type: Grant
    Filed: January 6, 2011
    Date of Patent: May 26, 2015
    Assignee: LG Electronics Inc.
    Inventor: Hyen-O Oh
  • Publication number: 20150131801
    Abstract: An apparatus for upmixing a downmix audio signal describing one or more downmix audio channels into an upmixed audio signal describing a plurality of upmixed audio channels includes an upmixer and a parameter determinator. The upmixer is configured to apply temporally variable upmix parameters to upmix the downmix audio signal in order to obtain the upmixed audio signal, wherein the temporally variable upmix parameters include temporally variable smoothened phase values. The parameter determinator is configured to obtain one or more temporally smoothened upmix parameters for usage by the upmixer on the basis of a quantized upmix parameter input information. The parameter determinator is configured to combine a scaled version of a previous smoothened phase value with a scaled version of an input phase information using a phase change limitation algorithm, to determine a current smoothened phase value on the basis of the previous smoothened phase value and the phase input information.
    Type: Application
    Filed: January 20, 2015
    Publication date: May 14, 2015
    Inventors: Matthias NEUSINGER, Julien ROBILLIARD, Johannes HILPERT
  • Publication number: 20150131800
    Abstract: The present document relates to audio encoding/decoding. In particular, the present document relates to a method and system for improving the quality of encoded multi-channel audio signals. An audio encoder configured to encode a multi-channel audio signal according to a total available data-rate is described. The multi-channel audio signal is representable as a basic group (121) of channels for rendering the multi-channel audio signal in accordance to a basic channel configuration, and as an extension group (122) of channels, which—in combination with the basic group (122)—is for rendering the multi-channel audio signal in accordance to an extended channel configuration. The basic channel configuration and the extended channel configuration are different from one another.
    Type: Application
    Filed: May 14, 2013
    Publication date: May 14, 2015
    Applicants: Dolby Laboratories Licensing Corporation, DOLBY INTERNATIONAL AB
    Inventors: Harald Mundt, Jeffrey Riedmiller, Karl J. Roeden, Michael Ward, Phillip Williams
  • Publication number: 20150124973
    Abstract: A method for encoding audio signals, for later reproduction in arbitrary three-dimensional loudspeaker layouts, based on the generation of an intermediate channel-independent representation, which enables the creation, manipulation and reproduction of sounds with complex apparent size and shape, including multiple disconnected shapes.
    Type: Application
    Filed: May 7, 2012
    Publication date: May 7, 2015
    Applicant: DOLBY INTERNATIONAL AB
    Inventors: Daniel Arteaga, Pau Arumi Albo, Antonio Mateos Sole
  • Patent number: 9025778
    Abstract: Provided is a method and apparatus for encoding/decoding an audio signal. Sections which are not used to output noise components near important spectral components and sub-bands which are not used to output noise components, are determined to be encoded or decoded, so that the efficiency of encoding and decoding an audio signal increases, and sound quality can be improved using less bits.
    Type: Grant
    Filed: September 10, 2012
    Date of Patent: May 5, 2015
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Eun-mi Oh, Anton Porov, Jung-hoe Kim
  • 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
  • Patent number: 9025777
    Abstract: An audio signal decoder for providing a decoded multi-channel audio signal representation on the basis of an encoded multi-channel audio signal representation has a time warp decoder configured to selectively use individual audio channel specific time warp contours or a joint multi-channel time warp contour for a reconstruction of a plurality of audio channels represented by the encoded multi-channel audio signal representation.
    Type: Grant
    Filed: July 1, 2009
    Date of Patent: May 5, 2015
    Assignee: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
    Inventors: Stefan Bayer, Sascha Disch, Ralf Geiger, Guillaume Fuchs, Max Neuendorf, Gerald Schuller, Bernd Edler
  • Publication number: 20150104021
    Abstract: On the basis of a bitstream (P), an n-channel audio signal (X) is reconstructed by deriving an m-channel core signal (Y) and multichannel coding parameters (?) from the bitstream, where 1?m<n. Also derived from the bitstream are pre-processing dynamic range control, DRC, parameters (DRC2) quantifying an encoder-side dynamic range limiting of the core signal. The n-channel audio signal is obtained by parametric synthesis in accordance with the multichannel coding parameters and while cancelling any encoder-side dynamic range limiting based on the pre-processing DRC parameters. In particular embodiments, the reconstruction further includes use of compensated post-processing DRC parameters quantifying a potential decoder-side dynamic range compression. Cancellation of an encoder-side range limitation and range compression are preferably performed by different decoder-side components. Cancellation and compression may be coordinated by a DRC pre-processor.
    Type: Application
    Filed: May 2, 2013
    Publication date: April 16, 2015
    Applicants: DOLBY INTERNATIONAL AB, DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: Jeffrey Riedmiller, Karl J. Roeden, Kristofer Kjoerling, Heiko Purnhagen, Vinay Melkote, Leif Sehlstrom
  • Patent number: 8989881
    Abstract: Parametric multichannel information is written onto a normal standard audio compact disc, e.g. in the user subchannels, so that the CD enables normal stereo reproduction with a normal reproduction device, or multichannel reproduction with a supplementary device which is easy to connect and which reads out both the stereo information and the parametric multichannel information from the audio CD actually conforming with the standard, and reconstructs more than two audio channels therefrom.
    Type: Grant
    Filed: August 18, 2006
    Date of Patent: March 24, 2015
    Assignee: Fraunhofer Gesellschaft zur Foerderung der angewandten Forschung e.V.
    Inventors: Harald Popp, Stefan Geyersberger, Wolfgang Fiesel
  • Publication number: 20150071447
    Abstract: In general, techniques are described for coding of spherical harmonic coefficients representative of a three dimensional soundfield. A device comprising a memory and one or more processors may be configured to perform the techniques. The memory may be configured to store a plurality of spherical harmonic coefficients. The one or more processors may be configured to perform an energy analysis with respect to the plurality of spherical harmonic coefficients to determine a reduced version of the plurality of spherical harmonic coefficients.
    Type: Application
    Filed: September 8, 2014
    Publication date: March 12, 2015
    Inventors: Dipanjan Sen, Nils Günther Peters, Martin James Morrell
  • Patent number: 8976970
    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: Grant
    Filed: September 14, 2011
    Date of Patent: March 10, 2015
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Mi Young Kim, Ki Hyun Choo, Eun Mi Oh, Boris Kudryashov, Kirill Yurkov
  • Patent number: 8976972
    Abstract: Processing of sound data encoded in a sub-band domain, for dual-channel playback of binaural or Transaural® type is provided, in which a matrix filtering is applied so as to pass from a sound representation with N channels with N>0, to a dual-channel representation. This sound representation with N channels comprises considering N virtual loudspeakers surrounding the head of a listener, and, for each virtual loudspeaker of at least some of the loudspeakers: a first transfer function specific to an ipsilateral path from the loudspeaker to a first ear of the listener, facing the loudspeaker, and a second transfer function specific to a contralateral path from said loudspeaker to the second ear of the listener, masked from the loudspeaker by the listener's head. The matrix filtering comprises a multiplicative coefficient defined by the spectrum, in the sub-band domain, of the second transfer function deconvolved with the first transfer function.
    Type: Grant
    Filed: October 8, 2010
    Date of Patent: March 10, 2015
    Assignee: Orange
    Inventors: Marc Emerit, Rozenn Nicol, Grégory Pallone
  • Patent number: 8976971
    Abstract: A method and an apparatus for adjusting a channel delay parameter of a multi-channel signal are provided in the embodiments of the present invention. The method includes: performing down-mixing processing on a multi-channel signal to obtain a processed signal (101); calculating energy distribution of the processed signal (102); and judging whether a comb filtering effect occurs in the processed signal according to the energy distribution of the processed signal, and adjusting a channel delay parameter of the multi-channel signal if the comb filtering effect occurs in the processed signal (103).
    Type: Grant
    Filed: October 20, 2011
    Date of Patent: March 10, 2015
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Libin Zhang, Qi Zhang
  • Patent number: 8964994
    Abstract: A method for coding a multi-channel audio signal representing a sound scene comprising a plurality of sound sources is provided. This method comprises decomposing the multi-channel signal into frequency bands and, per frequency band, obtaining directivity information per sound source of the sound scene, the information being representative of the spatial distribution of the sound source in the sound scene, of selecting a set of sound sources of the sound scene constituting principal sources, of matrixing the selected principal sources to obtain a sum signal with a reduced number of channels and, of coding the directivity information and of forming a binary stream comprising the coded directivity information, the binary stream being transmittable in parallel with the sum signal. A decoding method is also provided that is able to decode the sum signal and the directivity information to obtain a multi-channel signal, to an adapted coder and an adapted decoder.
    Type: Grant
    Filed: December 11, 2009
    Date of Patent: February 24, 2015
    Assignee: Orange
    Inventors: Florent Jaillet, David Virette