公开(公告)号：US20190251979A1

公开(公告)日：2019-08-15

申请号：US16295387

申请日：2019-03-07

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

Inventor： Srikanth Nagisetty ,  Zong Xian Liu ,  Hiroyuki Ehara

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

CPC classification number: G10L19/0208 ,  G10L19/028 ,  G10L19/035 ,  G10L21/038

Abstract: An encoding device according to the disclosure includes a first encoding unit that generates a first encoded signal in which a low-band signal having a frequency lower than or equal to a predetermined frequency from a voice or audio input signal is encoded, and a low-band decoded signal; a second encoding unit that encodes, on the basis of the low-band decoded signal, a high-band signal having a band higher than that of the low-band signal to generate a high-band encoded signal; and a first multiplexing unit that multiplexes the first encoded signal and the high-band encoded signal to generate and output an encoded signal. The second encoding unit calculates an energy ratio between a high-band noise component, which is a noise component of the high-band signal, and a high-band non-tonal component of a high-band decoded signal generated from the low-band decoded signal and outputs the ratio as the high-band encoded signal.

公开(公告)号：US10375394B2

公开(公告)日：2019-08-06

申请号：US15417232

申请日：2017-01-27

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

Inventor： Guillaume Fuchs ,  Benjamin Schubert ,  Grzegorz Pietrzyk ,  Markus Multrus ,  Bernhard Grill

IPC: H04N19/91 ,  H04N19/126 ,  G10L19/035 ,  H04N19/13 ,  H04N19/184 ,  H04N19/44 ,  H04N19/70

Abstract: Embodiments of the present invention provide an encoder comprising a quantization stage, an entropy encoder, a residual quantization stage and a coded signal former. The quantization stage is configured to quantize an input signal using a dead zone in order to obtain a plurality of quantized values. The entropy encoder is configured to encode the plurality of quantized values using an entropy encoding scheme in order to obtain a plurality of entropy encoded values. The residual quantization stage is configured to quantize a residual signal caused by the quantization stage, wherein the residual quantization stage is configured to determine at least one quantized residual value in dependence on the dead zone of the quantization stage. The coded signal former is configured to form a coded signal from the plurality of entropy encoded values and the at least one quantized residual value.

公开(公告)号：US10283132B2

公开(公告)日：2019-05-07

申请号：US15868143

申请日：2018-01-11

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Takehiro Moriya ,  Yutaka Kamamoto ,  Noboru Harada

IPC: G10L19/02 ,  G10L19/002 ,  G10L19/032 ,  G10L19/20 ,  G10L19/035

Abstract: In an encoding method that is expected to produce a smaller code amount out of a periodicity-based encoding method and a non-periodicity-based encoding method, the amount of code or an estimated value of the amount of code of an integer value sequence which is derived from an audio signal is obtained while adjusting gain. In the other encoding method, an integer value sequence obtained in this process is substituted to obtain the amount of code or an estimated value of the amount of code of the integer value sequence. The obtained code amounts or estimated values are compared to choose one of the encoding methods and the integer value sequence is encoded using the chosen encoding method to obtain and output an integer signal code.

公开(公告)号：US10255924B2

公开(公告)日：2019-04-09

申请号：US15002375

申请日：2016-01-20

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

Inventor： Maria Luis Valero ,  Christian Helmrich ,  Johannes Hilpert

IPC: G10L19/028 ,  G10L19/008 ,  G10L19/035 ,  H04S3/00

Abstract: In multichannel audio coding, an improved coding efficiency is achieved by the following measure: the noise filling of zero-quantized scale factor bands is performed using noise filling sources other than artificially generated noise or spectral replica. In particular, the coding efficiency in multichannel audio coding may be rendered more efficient by performing the noise filling based on noise generated using spectral lines from a previous frame of, or a different channel of the current frame of, the multichannel audio signal.

公开(公告)号：US20190027155A1

公开(公告)日：2019-01-24

申请号：US16141934

申请日：2018-09-25

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

Inventor： Zongxian Liu ,  Srikanth Nagisetty ,  Masahiro Oshikiri

IPC: G10L19/02 ,  G10L19/035

Abstract: Provided are a voice audio encoding device, voice audio decoding device, voice audio encoding method, and voice audio decoding method that efficiently perform bit distribution and improve sound quality. Dominant frequency band identification unit identifies a dominant frequency band having a norm factor value that is the maximum value within the spectrum of an input voice audio signal. Dominant group determination units and non-dominant group determination unit group all sub-bands into a dominant group that contains the dominant frequency band and a non-dominant group that contains no dominant frequency band. Group bit distribution unit distributes bits to each group on the basis of the energy and norm variance of each group. Sub-band bit distribution unit redistributes the bits that have been distributed to each group to each sub-band in accordance with the ratio of the norm to the energy of the groups.

公开(公告)号：US20180211677A1

公开(公告)日：2018-07-26

申请号：US15933108

申请日：2018-03-22

Applicant: DOLBY INTERNATIONAL AB

Inventor： Janusz KLEJSA ,  Lars VILLEMOES ,  Per HEDELIN

IPC: G10L19/035 ,  G10L19/028 ,  G10L19/005 ,  G10L19/20

CPC classification number: G10L19/035 ,  G10L19/005 ,  G10L19/028 ,  G10L19/20

Abstract: The present document relates an audio encoding and decoding system (referred to as an audio codec system). In particular, the present document relates to a transform-based audio codec system which is particularly well suited for voice encoding/decoding. A quantization unit configured to quantize a first coefficient of a block of coefficients is described. The block of coefficients comprises a plurality of coefficients for a plurality of corresponding frequency bins. The quantization unit is configured to provide a set of quantizers. The set of quantizers comprises a plurality of different quantizers associated with a plurality of different signal-to-noise ratios, referred to as SNR, respectively. The plurality of different quantizers includes a noise-filling quantizer; one or more dithered quantizers; and one or more un-dithered quantizers. The quantization unit is further configured to determine an SNR indication indicative of a SNR attributed to the first coefficient, and to select a first quantizer from the set of quantizers, based on the SNR indication. In addition, the quantization unit is configured to quantize the first coefficient using the first quantizer.

公开(公告)号：US20170345434A1

公开(公告)日：2017-11-30

申请号：US15680332

申请日：2017-08-18

Applicant: SONY CORPORATION

Inventor： Shiro SUZUKI ,  Yuuki MATSUMURA ,  Yasuhiro TOGURI ,  Yuuji MAEDA ,  Jun MATSUMOTO

IPC: G10L19/035 ,  G10L19/038 ,  H04N19/124 ,  H04N19/48 ,  H04N19/15 ,  H03M7/40 ,  H04N19/91 ,  G10L19/00

CPC classification number: G10L19/035 ,  G10L19/0017 ,  G10L19/038 ,  H03M7/4037 ,  H04N19/124 ,  H04N19/15 ,  H04N19/48 ,  H04N19/91

Abstract: The present technology relates to an encoder and an encoding method, a decoder and a decoding method, and a program by which encoding efficiency is able to be improved by constraining an appearance probability of a predetermined quantization value of an encoding target to 0 when encoding with a combination of Huffman encoding and multidimensional encoding is performed.

公开(公告)号：US20170316784A1

公开(公告)日：2017-11-02

申请号：US15650714

申请日：2017-07-14

Applicant: HUAWEI TECHNOLOGIES CO.,LTD.

Inventor： Zexin Liu ,  Bin Wang ,  Lei Miao

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

CPC classification number: G10L19/002 ,  G10L19/0204 ,  G10L19/035

Abstract: Present disclosure provide an audio signal encoding method and encoder, which relate to the communications field and can perform proper bit allocation for spectral coefficients of an audio signal. The method includes: splitting spectral coefficients of a current frame into subbands, acquiring quantized energy envelopes of the subbands;adjusting quantized energy envelopes values of some subbands; perform bit allocation according to adjusted quantized energy envelopes of the some subbands; quantizing a spectral coefficient of a subband to which at least one bit is allocated after the bit allocation.

公开(公告)号：US09754594B2

公开(公告)日：2017-09-05

申请号：US15170524

申请日：2016-06-01

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Zexin Liu ,  Bin Wang ,  Lei Miao

IPC: G10L19/00 ,  G10L19/002 ,  G10L19/02 ,  G10L19/035

CPC classification number: G10L19/002 ,  G10L19/0204 ,  G10L19/035

Abstract: Present disclosure provide an encoding method and apparatus, which relate to the communications field and can perform proper quantization bit allocation for spectral coefficients of an audio signal, thereby improving quality of a signal obtained by a decoder by means of decoding. The method includes: after splitting spectral coefficients of a current data frame into subbands, acquiring quantized frequency envelope values of the subbands; modifying quantized frequency envelope values of subbands of a first quantity in the subbands; allocating quantization bits to the subbands according to modified quantized frequency envelope values of the subbands of the first quantity; quantizing a spectral coefficient of a subband to which a quantization bit is allocated in the subbands; and writing the quantized spectral coefficient of the subband to which a quantization bit is allocated into a bitstream.

公开(公告)号：US20170103768A1

公开(公告)日：2017-04-13

申请号：US15386246

申请日：2016-12-21

Applicant: HUAWEI TECHNOLOGIES CO.,LTD.

Inventor： Zhe Wang

IPC: G10L19/22 ,  G10L19/035 ,  G10L19/02 ,  G10L19/06

CPC classification number: G10L19/22 ,  G10L19/02 ,  G10L19/0204 ,  G10L19/035 ,  G10L19/04 ,  G10L19/06 ,  G10L19/20 ,  G10L25/03

Abstract: An audio encoding method and an apparatus are provided. The method includes: determining sparseness of distribution, on spectrums, of energy of N input audio frames (101), where the N audio frames include a current audio frame, and N is a positive integer; and determining, according to the sparseness of distribution, on the spectrums, of the energy of the N audio frames, whether to use a first encoding method or a second encoding method to encode the current audio frame (102), where the first encoding method is an encoding method that is based on time-frequency transform and transform coefficient quantization and that is not based on linear prediction, and the second encoding method is a linear-predication-based encoding method. The method can reduce encoding complexity and ensure that encoding is of relatively high accuracy.