公开(公告)号：US11990147B2

公开(公告)日：2024-05-21

申请号：US17128665

申请日：2020-12-21

Applicant: Telefonaktiebolaget LM Ericsson (publ)

Inventor： Gustaf Ullberg ,  Manuel Briand ,  Anisse Taleb

IPC: G10L19/02 ,  G10L19/028 ,  G10L19/032 ,  G10L21/038 ,  G10L19/035

CPC classification number: G10L19/028 ,  G10L19/0204 ,  G10L19/032 ,  G10L21/038 ,  G10L19/035

Abstract: A method for spectrum recovery in spectral decoding of an audio signal, comprises obtaining of an initial set of spectral coefficients representing the audio signal, and determining a transition frequency. The transition frequency is adapted to a spectral content of the audio signal. Spectral holes in the initial set of spectral coefficients below the transition frequency are noise filled and the initial set of spectral coefficients are bandwidth extended above the transition frequency. Decoders and encoders being arranged for performing part of or the entire method are also illustrated.

公开(公告)号：US20230377586A1

公开(公告)日：2023-11-23

申请号：US18220693

申请日：2023-07-11

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

Inventor： Sascha DICK ,  Christian HELMRICH ,  Nikolaus RETTELBACH ,  Florian SCHUH ,  Richard FUEG ,  Frederik NAGEL

IPC: G10L19/008 ,  G10L19/035 ,  G10L19/028

CPC classification number: G10L19/008 ,  G10L19/035 ,  G10L19/028

Abstract: An apparatus for decoding an encoded multichannel signal of a current frame to obtain three or more current audio output channels is provided. A multichannel processor is adapted to select two decoded channels from three or more decoded channels depending on first multichannel parameters. Moreover, the multichannel processor is adapted to generate a first group of two or more processed channels based on the selected channels. A noise filling module is adapted to identify for at least one of the selected channels, one or more frequency bands, within which all spectral lines are quantized to zero, and to generate a mixing channel using, depending on side information, a proper subset of three or more previous audio output channels that have been decoded, and to fill the spectral lines of frequency bands, within which all spectral lines are quantized to zero, with noise generated using spectral lines of the mixing channel.

公开(公告)号：US11705142B2

公开(公告)日：2023-07-18

申请号：US17060888

申请日：2020-10-01

Applicant: SAMSUNG ELECTRONICS CO., LTD.

Inventor： Ho-sang Sung

IPC: G10L19/032 ,  G10L19/035 ,  G10L19/02

CPC classification number: G10L19/0204 ,  G10L19/032 ,  G10L19/035

Abstract: A spectrum encoding method includes selecting an important spectral component in band units for a normalized spectrum and encoding information of the selected important spectral component for a band, based on a number, a position, a magnitude and a sign thereof. A spectrum decoding method includes obtaining from a bitstream, information about an important spectral component for a band of an encoded spectrum and decoding the obtained information of the important spectral component, based on a number, a position, a magnitude and a sign of the important spectral component.

公开(公告)号：US11621010B2

公开(公告)日：2023-04-04

申请号：US16971977

申请日：2019-02-19

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Ryosuke Sugiura ,  Yutaka Kamamoto ,  Takehiro Moriya

IPC: G10L19/035

Abstract: Efficient assignment of bit numbers is performed even under a low bit rate condition. A quantizer 12 obtains a quantized spectral sequence from a frequency spectral sequence. An integer transformer 13 obtains a unified quantized spectral sequence by obtaining, by a bijective transformation, a transformed integer for each of the sets, each being made up of integer values, obtained from the quantized spectral sequence. An integer encoder 15 obtains an integer code by encoding the unified quantized spectral sequence using a bit assignment sequence. An object-to-be-encoded estimator 18 obtains an estimated unified spectral sequence from the frequency spectral sequence by a transformation which is performed by the integer transformer 13 or a transformation that approximates the magnitude relationship between values before and after the above transformation. A bit assigner 14 obtains a bit assignment sequence and a bit assignment code from the estimated unified spectral sequence. A quantization step size obtainer 11 obtains a quantization step size from the estimated unified spectral sequence and the bit assignment sequence.

公开(公告)号：US11468905B2

公开(公告)日：2022-10-11

申请号：US16332583

申请日：2017-09-13

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Ryosuke Sugiura ,  Takehiro Moriya ,  Noboru Harada ,  Takahito Kawanishi ,  Yutaka Kamamoto ,  Kouichi Furukado ,  Junichi Nakajima ,  Jouji Nakayama ,  Kenichi Noguchi ,  Keisuke Hasegawa

IPC: G10L19/035 ,  G10L19/00

Abstract: Performance of an encoding process and a decoding process for a sound signal is enhanced. A representative value calculating part 110 calculates, for each frequency section by a plurality of samples fewer than the number of frequency samples of a sample sequence of a frequency domain signal corresponding to an input acoustic signal, from the sample sequence of the frequency domain signal, a representative value of the frequency section from sample values of samples included in the frequency section, for each of predetermined time sections. A signal companding part 120 obtains, for each of the predetermined time sections, a frequency domain sample sequence obtained by multiplying a weight according to a function value of the representative value by a companding function for which an inverse function can be defined and each of the samples corresponding to the representative value in the sample sequence of the frequency domain signal, as a sample sequence of a weighted frequency domain signal.

公开(公告)号：US11367455B2

公开(公告)日：2022-06-21

申请号：US16932479

申请日：2020-07-17

Applicant: DOLBY INTERNATIONAL AB

Inventor： Lars Villemoes ,  Heiko Purnhagen ,  Per Ekstrand

IPC: G10L19/16 ,  G10L19/035 ,  G10L19/24 ,  G10L21/038

Abstract: Embodiments relate to an audio processing unit that includes a buffer, bitstream payload deformatter, and a decoding subsystem. The buffer stores at least one block of an encoded audio bitstream. The block includes a fill element that begins with an identifier followed by fill data. The fill data includes at least one flag identifying whether enhanced spectral band replication (eSBR) processing is to be performed on audio content of the block. A corresponding method for decoding an encoded audio bitstream is also provided.

公开(公告)号：US11289102B2

公开(公告)日：2022-03-29

申请号：US16506295

申请日：2019-07-09

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Zexin Liu ,  Bin Wang ,  Lei Miao

IPC: G10L19/002 ,  G10L19/02 ,  G10L19/035

Abstract: Present disclosure provide an audio signal encoding method and communication terminal, which relate to the communications field. The method and communication terminal are used to obtain an analog audio signal and encoding the analog audio signal to obtain a bitstream representing the analog audio signal, in which a proper bit allocation for spectral coefficients can be performed.

公开(公告)号：US20210366499A1

公开(公告)日：2021-11-25

申请号：US17396526

申请日：2021-08-06

Applicant: Fraunhofer-Geselischaft zur Foerderung der angewandten Forschung e.V.

Inventor： Martin DIETZ ,  Guillaume FUCHS ,  Christian HELMRICH ,  Goran MARKOVIC

IPC: G10L19/035 ,  G10L19/02 ,  G10H1/06 ,  G10L25/18 ,  G10L25/21 ,  G10L25/45

Abstract: The invention provides an audio encoder for encoding an audio signal so as to produce therefrom an encoded signal, the audio encoder including: a framing device configured to extract frames from the audio signal; a quantizer configured to map spectral lines of a spectrum signal derived from the frame of the audio signal to quantization indices, wherein the quantizer has a dead-zone, in which the input spectral lines are mapped to quantization index zero; and a control device configured to modify the dead-zone; wherein the control device includes a tonality calculating device configured to calculate at least one tonality indicating value for at least one spectrum line or for at least one group of spectral lines, wherein the control device is configured to modify the dead-zone for the at least one spectrum line or the at least one group of spectrum lines depending on the respective tonality indicating value.

公开(公告)号：US20210335372A1

公开(公告)日：2021-10-28

申请号：US16332583

申请日：2017-09-13

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Ryosuke SUGIURA ,  Takehiro MORIYA ,  Noboru HARADA ,  Takahito KAWANISHI ,  Yutaka KAMAMOTO ,  Kouichi FURUKADO ,  Junichi NAKAJIMA ,  Jouji NAKAYAMA ,  Kenichi NOGUCHI ,  Keisuke HASEGAWA

IPC: G10L19/035 ,  G10L19/00

Abstract: Performance of an encoding process and a decoding process for a sound signal is enhanced. A representative value calculating part 110 calculates, for each frequency section by a plurality of samples fewer than the number of frequency samples of a sample sequence of a frequency domain signal corresponding to an input acoustic signal, from the sample sequence of the frequency domain signal, a representative value of the frequency section from sample values of samples included in the frequency section, for each of predetermined time sections. A signal companding part 120 obtains, for each of the predetermined time sections, a frequency domain sample sequence obtained by multiplying a weight according to a function value of the representative value by a companding function for which an inverse function can be defined and each of the samples corresponding to the representative value in the sample sequence of the frequency domain signal, as a sample sequence of a weighted frequency domain signal.

公开(公告)号：US20210272577A1

公开(公告)日：2021-09-02

申请号：US17322656

申请日：2021-05-17

Applicant: Fraunhofer-Gesellschaft zur Foerderung der Angewandten Forschung e.V.

Inventor： Nikolaus RETTELBACH ,  Bernhard GRILL ,  Guillaume FUCHS ,  Stefan GEYERSBERGER ,  Markus MULTRUS ,  Harald POPP ,  Juergen HERRE ,  Stefan WABNIK ,  Gerald SCHULLER ,  Jens HIRSCHFELD

IPC: G10L19/035 ,  G10L19/02 ,  G10L19/028 ,  G10L19/032 ,  G10L19/008

Abstract: An encoder for providing an audio stream on the basis of a transform-domain representation of an input audio signal includes a quantization error calculator configured to determine a multi-band quantization error over a plurality of frequency bands of the input audio signal for which separate band gain information is available. The encoder also includes an audio stream provider for providing the audio stream such that the audio stream includes information describing an audio content of the frequency bands and information describing the multi-band quantization error.
A decoder for providing a decoded representation of an audio signal on the basis of an encoded audio stream representing spectral components of frequency bands of the audio signal includes a noise filler for introducing noise into spectral components of a plurality of frequency bands to which separate frequency band gain information is associated on the basis of a common multi-band noise intensity value.