公开(公告)号：US20230042393A1

公开(公告)日：2023-02-09

申请号：US17963767

申请日：2022-10-11

申请人： DOLBY INTERNATIONAL AB

发明人： Lars Villemoes ,  Heiko Purnhagen ,  Per Ekstrand

IPC分类号： G10L19/26 ,  G10L19/008 ,  G10L19/24

摘要： A method for decoding an encoded audio bitstream is disclosed. The method includes receiving the encoded audio bitstream and decoding the audio data to generate a decoded lowband audio signal. The method further includes extracting high frequency reconstruction metadata and filtering the decoded lowband audio signal with an analysis filterbank to generate a filtered lowband audio signal. The method also includes extracting a flag indicating whether either spectral translation or harmonic transposition is to be performed on the audio data and regenerating a highband portion of the audio signal using the filtered lowband audio signal and the high frequency reconstruction metadata in accordance with the flag.

公开(公告)号：US20220406328A1

公开(公告)日：2022-12-22

申请号：US17841002

申请日：2022-06-15

申请人： Oticon A/S

发明人： Michael Syskind PEDERSEN ,  Jan M. DE HAAN ,  Jesper JENSEN

IPC分类号： G10L25/30 ,  H04R25/00 ,  G10L19/26 ,  G10L21/057

摘要： A hearing device comprises a) at least one input transducer configured to pick up sound from an acoustic environment around the user when the user is wearing the hearing device, the at least one input transducer providing at least one electric input signal representative of said sound, b) at least one analysis filter bank configured to provide said at least one electric input signal as a multitude of frequency sub-band signals, the at least one analysis filter bank comprising b1) a plurality of M first filters hm(n), whose impulse responses are modulated from a first prototype filter h(n), where m=0, 1, . . . , M−1 is a frequency band index, and n is a time index, c) a processor for processing said at least one electric input signal provided by said at least one analysis filter bank, or a signal originating therefrom, and providing a processed signal, d) an output transducer configured to provide stimuli perceivable as sound to the user in dependence of said processed signal, and e) a controller for controlling said analysis filter bank by applying a different first prototype filter to said at least one filter bank in dependence of said current acoustic environment. A method of operating a hearing device is further disclosed.

公开(公告)号：US20220392463A1

公开(公告)日：2022-12-08

申请号：US17842499

申请日：2022-06-16

申请人： Telefonaktiebolaget LM Ericsson (publ)

发明人： Erik NORVELL ,  Tomas JANSSON TOFTGÅRD

IPC分类号： G10L19/008 ,  G10L19/26 ,  G10L21/0308

摘要： A method for increasing stability of an inter-channel time difference (ICTD) parameter in parametric audio coding, wherein a multi-channel audio input signal comprising at least two channels is received. The method comprises obtaining an ICTD estimate, ICTDest(m), for an audio frame m and a stability estimate of said ICTD estimate, and determining whether the obtained ICTD estimate, ICTDest(m), is valid. If the ICTDest(m) is not found valid, and a determined sufficient number of valid ICTD estimates have been found in preceding frames, a hang-over time is determined using the stability estimate and a previously obtained valid ICTD parameter, ICTD(m−1), is selected as an output parameter, ICTD(m), during the hang-over time. The output parameter, ICTD(m), is set to zero if valid ICTDest(m) is not found during the hang-over time.

公开(公告)号：US20220351736A1

公开(公告)日：2022-11-03

申请号：US17812109

申请日：2022-07-12

申请人： Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.

发明人： Jouni Paulus ,  Sascha Disch ,  Harald Fuchs ,  Bernhard Grill ,  Oliver Hellmuth ,  Adrian Murtaza ,  Falko Ridderbusch ,  Leon Terentiv

IPC分类号： G10L19/008 ,  G10L19/26 ,  H03G3/20

摘要： A decoder for generating an audio output signal having one or more audio output channels is provided, having a receiving interface for receiving an audio input signal having a plurality of audio object signals, for receiving loudness information on the audio object signals, and for receiving rendering information indicating whether one or more of the audio object signals shall be amplified or attenuated, further having a signal processor for generating the one or more audio output channels of the audio output signal, configured to determine a loudness compensation value depending on the loudness information and depending on the rendering information, and configured to generate the one or more audio output channels of the audio output signal from the audio input signal depending on the rendering information and depending on the loudness compensation value. One or more by-pass audio object signals are employed for generating the audio output signal. Moreover, an encoder is provided.

公开(公告)号：US11430457B2

公开(公告)日：2022-08-30

申请号：US16846272

申请日：2020-04-10

申请人： ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

发明人： Seung Kwon Beack ,  Tae Jin Lee ,  Min Je Kim ,  Kyeongok Kang ,  Dae Young Jang ,  Jin Woo Hong ,  Jeongil Seo ,  Chieteuk Ahn ,  Hochong Park ,  Young-Cheol Park

IPC分类号： G10L19/087 ,  G10L19/22 ,  G10L19/125 ,  G10L19/26

摘要： Disclosed is an LPC residual signal encoding/decoding apparatus of an MDCT based unified voice and audio encoding device. The LPC residual signal encoding apparatus analyzes a property of an input signal, selects an encoding method of an LPC filtered signal, and encode the LPC residual signal based on one of a real filterbank, a complex filterbank, and an algebraic code excited linear prediction (ACELP).

公开(公告)号：US11430456B2

公开(公告)日：2022-08-30

申请号：US16999448

申请日：2020-08-21

申请人： Huawei Technologies Co., Ltd.

发明人： Bin Wang ,  Zexin Liu ,  Lei Miao

IPC分类号： G10L19/03 ,  G10L19/26 ,  G10L21/038 ,  G10L19/12 ,  G10L19/02 ,  G10L19/00

摘要： An encoding method, a decoding method, an encoding apparatus, a decoding apparatus, a transmitter, a receiver, and a communications system, where the encoding method includes dividing a to-be-encoded time-domain signal into a low band signal and a high band signal, performing encoding on the low band signal to obtain a low frequency encoding parameter, performing encoding on the high band signal to obtain a high frequency encoding parameter, obtaining a synthesized high band signal; performing short-time post-filtering processing on the synthesized high band signal to obtain a short-time filtering signal, and calculating a high frequency gain based on the high band signal and the short-time filtering signal.

公开(公告)号：US11423916B2

公开(公告)日：2022-08-23

申请号：US16900950

申请日：2020-06-14

申请人： DOLBY INTERNATIONAL AB

发明人： Kristofer Kjoerling ,  Lars Villemoes

IPC分类号： G10L19/02 ,  G10L25/18 ,  G10L25/48 ,  H03H17/02 ,  G10L19/00 ,  G10L19/12 ,  G10L19/26 ,  G10L25/21 ,  G10L19/025 ,  G10L19/083 ,  G10L25/12

摘要： The present invention proposes a new method for improving the performance of a real-valued filterbank based spectral envelope adjuster. By adaptively locking the gain values for adjacent channels dependent on the sign of the channels, as defined in the application, reduced aliasing is achieved. Furthermore, the grouping of the channels during gain-calculation, gives an improved energy estimate of the real valued subband signals in the filterbank.

公开(公告)号：US11423914B2

公开(公告)日：2022-08-23

申请号：US16883852

申请日：2020-05-26

申请人： Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.

发明人： Jouni Paulus ,  Sascha Disch ,  Harald Fuchs ,  Bernhard Grill ,  Oliver Hellmuth ,  Adrian Murtaza ,  Falko Ridderbusch ,  Leon Terentiv

IPC分类号： G10L19/008 ,  G10L19/26 ,  H03G3/20

摘要： A decoder for generating an audio output signal having one or more audio output channels is provided, having a receiving interface for receiving an audio input signal having a plurality of audio object signals, for receiving loudness information on the audio object signals, and for receiving rendering information indicating whether one or more of the audio object signals shall be amplified or attenuated, further having a signal processor for generating the one or more audio output channels of the audio output signal, configured to determine a loudness compensation value depending on the loudness information and depending on the rendering information, and configured to generate the one or more audio output channels of the audio output signal from the audio input signal depending on the rendering information and depending on the loudness compensation value. One or more by-pass audio object signals are employed for generating the audio output signal. Moreover, an encoder is provided.

公开(公告)号：US11381925B2

公开(公告)日：2022-07-05

申请号：US15138168

申请日：2016-04-25

申请人： Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.

发明人： Sascha Disch ,  Harald Fuchs ,  Oliver Hellmuth ,  Juergen Herre ,  Adrian Murtaza ,  Jouni Paulus ,  Falko Ridderbusch ,  Leon Terentiv

IPC分类号： H04S3/02 ,  G10L19/008 ,  H04S3/00 ,  G10L19/032 ,  G10L19/26 ,  G10L19/20 ,  G10L19/22

摘要： A multi-channel decorrelator for providing a plurality of decorrelated signals on the basis of a plurality of decorrelator input signals is configured to premix a first set of N decorrelator input signals into a second set of K decorrelator input signals, wherein K K′. The multi-channel decorrelator can be used in a multi-channel audio decoder. A multi-channel audio encoder provides complexity control information for the multi-channel decorrelator.

公开(公告)号：US11367454B2

公开(公告)日：2022-06-21

申请号：US16867856

申请日：2020-05-06

申请人： Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.

发明人： Guillaume Fuchs ,  Jürgen Herre ,  Fabian Küch ,  Stefan Döhla ,  Markus Multrus ,  Oliver Thiergart ,  Oliver Wübbolt ,  Florin Ghido ,  Stefan Bayer ,  Wolfgang Jaegers

IPC分类号： G10L19/038 ,  G10L19/008 ,  G10L19/16 ,  G10L19/26 ,  G10L19/02 ,  G10L19/032 ,  H03M7/30

摘要： An apparatus for encoding directional audio coding parameters having diffuseness parameters and direction parameters, has: a parameter quantizer for quantizing the diffuseness parameters and the direction parameters; a parameter encoder for encoding quantized diffuseness parameters and quantized direction parameters; and an output interface for generating an encoded parameter representation having information on encoded diffuseness parameters and encoded direction parameters.