公开(公告)号：US08731909B2

公开(公告)日：2014-05-20

申请号：US13057454

申请日：2009-08-07

申请人： Tomofumi Yamanashi ,  Masahiro Oshikiri ,  Toshiyuki Morii ,  Hiroyuki Ehara

发明人： Tomofumi Yamanashi ,  Masahiro Oshikiri ,  Toshiyuki Morii ,  Hiroyuki Ehara

IPC分类号： G10L19/02 ,  G10L19/14 ,  G10L19/00

CPC分类号： G10L19/0204 ,  G10L19/0212 ,  G10L19/032 ,  G10L19/24 ,  G10L21/02

摘要： Disclosed is a spectral smoothing device with a structure whereby smoothing is performed after a nonlinear conversion has been performed for a spectrum calculated from an audio signal, and with which the amount of processing calculation is significantly reduced while maintaining excellent audio quality. With this spectral smoothing device, a sub band division unit (102) divides an input spectrum into multiple sub bands; a representative value calculation unit (103) calculates a representative value for each sub band using an arithmetic mean and a geometric mean; with respect to each representative value, a nonlinear conversion unit (104) performs a nonlinear conversion the characteristic of which is further emphasized as the value increases; and a smoothing unit (105) that smoothes the representative value which has undergone the nonlinear conversion for each sub band, at the frequency domain.

摘要翻译： 公开了一种光谱平滑装置，其具有在对从音频信号计算出的频谱进行非线性转换之后进行平滑处理，并且在保持优良音频质量的同时显着减少处理计算量的结构。 利用该频谱平滑装置，子带分割单元（102）将输入频谱划分成多个子频带; 代表值计算单元（103）使用算术平均值和几何平均值计算每个子带的代表值; 对于每个代表值，非线性转换单元（104）执行非线性转换，其特性随着值的增加被进一步强调; 以及平滑化单元（105），其以频域对每个子带进行了非线性转换的代表值进行平滑化。

公开(公告)号：US08660851B2

公开(公告)日：2014-02-25

申请号：US13322202

申请日：2010-05-25

申请人： Tomofumi Yamanashi ,  Masahiro Oshikiri ,  Hiroyuki Ehara

发明人： Tomofumi Yamanashi ,  Masahiro Oshikiri ,  Hiroyuki Ehara

IPC分类号： G10L19/008

CPC分类号： G10L19/005 ,  G10L19/008

摘要： A decoding device reduces abrupt changes in the number of channels in a decoded signal when transmission errors occur as a result of lost frames in an encoding/decoding system for multichannel signals. In the device, a demultiplexer receives an encoded monaural signal and an encoded differential signal and detects change over time in the received encoded differential signal. An M signal decoder decodes the encoded monaural signal and obtains a decoded monaural signal. An S signal decoder decodes the encoded differential signal and obtains a decoded differential signal. A smoothing unit performs smoothing on the decoded differential signal by means of a computation involving the decoded differential signal and coefficients corresponding to the change over time detected by the demultiplexer. An L/R signal computation unit computes a decoded stereo signal from the decoded monaural signal and the smoothed decoded differential signal.

摘要翻译： 由于多通道信号的编码/解码系统中的丢失帧的结果，当传输错误发生时，解码装置减少解码信号中的信道数量的突然变化。 在该装置中，解复用器接收经编码的单声道信号和经编码的差分信号，并检测接收到的编码差分信号中随时间的变化。 M信号解码器解码编码的单声道信号并获得解码的单声道信号。 S信号解码器对编码的差分信号进行解码并获得解码的差分信号。 平滑单元通过涉及解码的差分信号的计算和对应于由解复用器检测到的随时间变化的系数对解码的差分信号进行平滑处理。 L / R信号计算单元从解码的单声道信号和平滑的解码的差分信号计算解码的立体声信号。

公开(公告)号：US08554549B2

公开(公告)日：2013-10-08

申请号：US12528659

申请日：2008-02-29

申请人： Masahiro Oshikiri ,  Toshiyuki Morii ,  Tomofumi Yamanashi

发明人： Masahiro Oshikiri ,  Toshiyuki Morii ,  Tomofumi Yamanashi

IPC分类号： G10L19/12

CPC分类号： G10L19/00 ,  G10L19/005 ,  G10L19/02 ,  G10L19/0208 ,  G10L19/038 ,  G10L19/083 ,  G10L19/24 ,  G10L25/18

摘要： A voice encoding device accurately encodes a spectrum shape of a signal having a strong tonality such as a vowel. The device includes: a sub-band divider which divides a first layer error conversion coefficient to be encoded into M sub-bands so as to generate M sub-band conversion coefficients; a shape vector encoder which performs encoding on each of the M sub-band conversion coefficients so as to obtain M shape encoded information and calculates a target gain of each of the M sub-band conversion coefficients; a gain vector former which forms one gain vector by using M target gains; a gain vector encoder which encodes the gain vector so as to obtain gain encoded information; and a multiplexer which multiplexes the shape encoded information with the gain encoded information.

摘要翻译： 语音编码装置对具有强音调的信号（例如元音）的频谱形状进行精确编码。 该装置包括：子带分割器，将要编码的第一层错误转换系数分成M个子带，以产生M个子带转换系数; 形状矢量编码器，对M个子带变换系数中的每一个进行编码，以获得M个形状的编码信息，并计算M个子带转换系数中的每一个的目标增益; 通过使用M个目标增益形成一个增益矢量的增益矢量前者; 增益矢量编码器，其对所述增益矢量进行编码，以获得增益编码信息; 以及多路复用器，其将形状编码信息与增益编码信息进行复用。

公开(公告)号：US20130223633A1

公开(公告)日：2013-08-29

申请号：US13882750

申请日：2011-10-17

申请人： Masahiro Oshikiri ,  Hiroyuki Ehara

发明人： Masahiro Oshikiri ,  Hiroyuki Ehara

IPC分类号： G10L19/008

CPC分类号： G10L19/008 ,  G10L19/22

摘要： 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.

摘要翻译： 提供了一种立体声信号编码装置，当将间歇传输技术应用于立体声信号时，能够实现较低的比特率而不降低质量。 立体声编码单元（103）当当前帧的立体声信号是音频部分A时通过对立体声信号进行编码来产生第一立体声编码数据。立体声DTX编码单元（104）是当立体声信号的立体声信号 当前帧是非音频部分，并且通过编码以下各项来生成第二立体声编码数据：单声道信号频谱参数，其是使用第一信道信号和第二信道信号产生的单声道信号的频谱参数; 与第一信道信号相关的第一信道信号信息; 以及与第二信道信号相关的第二信道信号信息。

公开(公告)号：US20130173275A1

公开(公告)日：2013-07-04

申请号：US13822810

申请日：2011-09-14

申请人： Zongxian Liu ,  Kok Seng Chong ,  Masahiro Oshikiri

发明人： Zongxian Liu ,  Kok Seng Chong ,  Masahiro Oshikiri

IPC分类号： G10L19/06

CPC分类号： G10L19/06 ,  G10L19/0212 ,  G10L19/24

摘要： Provided is an audio encoding device that can suppress degradation of audio quality. Spectral coefficients of synthesized signal from CELP core layer are utilized to fulfill spectral gaps in error signal spectrum coefficients from a transform coding layer. By both spectral coefficients, decoded signal spectral coefficients are generated. The decoded signal spectral coefficients and the input signal spectral coefficients are divided into a plurality of sub bands. In each sub band, the energy of the input signal spectral coefficient corresponding to a zero decoded error signal spectral coefficient is calculated, and the energy of the decoded signal spectral coefficient corresponding to the zero decoding error signal spectral coefficient is calculated, and their energy ratio is calculated and is quantized and transmitted.

摘要翻译： 提供了可以抑制音频质量劣化的音频编码装置。 利用来自CELP核心层的合成信号的频谱系数来实现来自变换编码层的误差信号频谱系数中的频谱间隙。 通过两个频谱系数，生成解码信号频谱系数。 解码信号频谱系数和输入信号频谱系数被分成多个子频带。 在每个子带中，计算与零解码误差信号频谱系数相对应的输入信号频谱系数的能量，并且计算与零解码误差信号频谱系数对应的解码信号频谱系数的能量，并且其能量比 被计算并被量化和传输。

公开(公告)号：US20130132099A1

公开(公告)日：2013-05-23

申请号：US13814597

申请日：2011-11-08

申请人： Masahiro Oshikiri ,  Takako Hori ,  Hiroyuki Ehara

发明人： Masahiro Oshikiri ,  Takako Hori ,  Hiroyuki Ehara

IPC分类号： G10L19/008

CPC分类号： G10L19/008 ,  G10L19/22 ,  G10L19/24 ,  G10L21/038

摘要： Provided are a coding device, a decoding device, and methods thereof, with which it is possible to implement high sound quality coding and decoding in layered coding (scalable coding or embedded coding) wherein each layer comprises a plurality of bit rates (multi-rate). In the coding device (100), a feature analysis unit (101) extracts feature values of an input signal. Then a bit rate determination unit (102) determines, on the basis of the feature values of the input signal, a combination of a coding rate (low region coding rate) of a low region signal coding unit (104) which carries out coding of a low region part of the input signal and a coding rate (high region coding rate) of a high region signal coding unit (105) which carries out coding of a high region part of the input signal.

摘要翻译： 提供了一种编码装置，解码装置及其方法，其可以在分层编码（可伸缩编码或嵌入编码）中实现高音质编码和解码，其中每层包括多个比特率（多速率 ）。 在编码装置（100）中，特征分析部（101）提取输入信号的特征值。 然后，比特率确定单元（102）基于输入信号的特征值，确定执行编码的低区域信号编码单元（104）的编码率（低区域编码率） 输入信号的低区域部分和执行输入信号的高区域部分的编码的高区域信号编码单元（105）的编码率（高区域编码率）。

公开(公告)号：US20130124201A1

公开(公告)日：2013-05-16

申请号：US13703491

申请日：2011-06-07

申请人： Tomofumi Yamanashi ,  Masahiro Oshikiri

发明人： Tomofumi Yamanashi ,  Masahiro Oshikiri

IPC分类号： G10L19/008 ,  H03G3/20

CPC分类号： G10L19/008 ,  G10L19/0212 ,  G10L19/18 ,  G10L19/24 ,  G10L21/038 ,  H03G3/20

摘要： Disclosed is a decoding device which can efficiently encode/decode spectral data in a high pass section of a broadband signal. In the disclosed device: a sample group extraction unit (372) partially selects spectral components by means of an ease of selection importance which is the extent that the spectral components come close to the spectral component having the maximum amplitude value, in the spectrum of a high pass estimated by means of first parameters contained in second encoded information and bands most approximated to each of the spectrums of a plurality of sub-bands calculated from the spectrum of a second decode signal; a logarithmic gain application unit (373) applies second parameters to the partially selected spectral components; and an interpolation processing unit (374) applies third parameters which are adaptively set according to the value of the second parameters, to the spectral components which were not partially selected.

摘要翻译： 公开了一种可以在宽带信号的高通部分中有效地编码/解码频谱数据的解码装置。 在所公开的装置中：采样组提取单元（372）通过在频谱分量接近具有最大振幅值的频谱分量的范围内的选择重要性的方面来部分地选择频谱分量 通过第二编码信息中包含的第一参数和最接近于从第二解码信号的频谱计算出的多个子带的每个频谱的频带估计的高通; 对数增益应用单元（373）将第二参数应用于部分选择的频谱分量; 并且插值处理单元（374）将根据第二参数的值自适应地设定的第三参数应用于未被部分选择的频谱分量。

公开(公告)号：US20130103394A1

公开(公告)日：2013-04-25

申请号：US13807129

申请日：2011-07-06

申请人： Zongxian Liu ,  Masahiro Oshikiri

发明人： Zongxian Liu ,  Masahiro Oshikiri

IPC分类号： G10L19/12

CPC分类号： G10L19/12 ,  G10L19/0208 ,  G10L19/038

摘要： This invention introduces apparatus and methods to efficiently encode the quantization parameters of split multi-rate lattice vector quantization. In this invention, by doing spectral analysis on the split multi-rate vector quantized spectrum, the spectrum is split to null vectors region and non-null vectors region. For the null vectors region, instead of transmitting series of indication for null vectors, an indication of null vectors region and the quantized value of index of the ending vector in the null vectors region (or the number of the null vectors in the null vectors region) are transmitted. The indication of null vectors region can be designed in many ways, the only requirement is the indication should be distinguishable in the decoder side. The ending index or the number of null vectors can be quantized by an adaptively designed codebook. By applying of the invented method, some bits can be saved from the codebook indications.

摘要翻译： 本发明引入了对分割多速率格子矢量量化的量化参数进行有效编码的装置和方法。 在本发明中，通过对分割的多速率矢量量化频谱进行频谱分析，将频谱分解为零矢量区域和非空矢量区域。 对于空矢量区域，不是发送空矢量的一系列指示，空向量区域的指示和空向量区域中的结束向量的索引的量化值（或空向量区域中的零向量的数量） ）被传送。 空向量区域的指示可以以多种方式设计，唯一的要求是在解码器侧应该区分指示。 结束索引或空向量的数量可以通过自适应设计的码本进行量化。 通过应用本发明的方法，可以从码本指示中保存一些比特。

公开(公告)号：US20130035943A1

公开(公告)日：2013-02-07

申请号：US13641493

申请日：2011-04-01

申请人： Tomofumi Yamanashi ,  Masahiro Oshikiri

发明人： Tomofumi Yamanashi ,  Masahiro Oshikiri

IPC分类号： G10L21/00

CPC分类号： G10L19/24 ,  G10L19/038 ,  G10L2019/0006

摘要： Disclosed is an encoding device capable of improving decoded signal quality. A local search unit (302) conducts a local search on a plurality of sub-bands generated by dividing spectrum data, and calculates lattice vectors for the spectra in the plurality of sub-bands. A multi-rate indexing unit (303) uses the lattice vectors to perform multi-rate indexing on each of the sub-bands, and generates indexing information showing the results thereof. A band selection unit (304) determines certain sub-bands from amongst the plurality of sub-bands in a plurality of encoding layers as perceptually important sub-band groups, where these are: within a selection range of sub-bands wherein the total number of encoding bits allocated to each of the plurality of sub-bands in the indexing information is equal to or less than an already set value, and within a sub-band selection range with the highest total energy of each of the plurality of sub-bands.

摘要翻译： 公开了能够提高解码信号质量的编码装置。 本地搜索单元（302）对通过分割频谱数据产生的多个子带进行局部搜索，并且计算多个子带中的频谱的格子向量。 多速率索引单元（303）使用格子向量对每个子带执行多速率索引，并生成表示其结果的索引信息。 频带选择单元（304）从多个编码层中的多个子频带中确定某些子频带，作为感知上重要的子频带组，其中它们是：在子频段的选择范围内，其中总数 分配给索引信息中的多个子带中的每一个的编码比特等于或小于已经设定的值，并且在多个子带中的每个子带的总能量最高的子带选择范围内 。

公开(公告)号：US20120296640A1

公开(公告)日：2012-11-22

申请号：US13521112

申请日：2011-01-12

申请人： Tomofumi Yamanashi ,  Masahiro Oshikiri

发明人： Tomofumi Yamanashi ,  Masahiro Oshikiri

IPC分类号： G10L19/02

CPC分类号： G10L19/0208 ,  G10L19/032

摘要： Disclosed are an encoding device and encoding method capable of improving the quality of a decoded signal under very low bit rate conditions using a small amount of computation. A spectrum correction unit (302) performs correction processing on the subspectrum in each subband in such a manner that samples equal to or greater than a subspectrum average value are left unchanged while samples smaller than the subspectrum average value are replaced by zero. As a result of this, it is possible to significantly reduce the number of bits required to quantize the subspectrums without substantial reduction in quality in a local search unit (303) and in a multi-rate indexing unit (304).

摘要翻译： 公开了一种编码装置和编码方法，其能够使用少量的计算来在非常低的比特率条件下提高解码信号的质量。 频谱校正单元（302）以等于或大于子频谱平均值的样本在小于子频谱平均值的样本被零替换的方式对每个子带中的子频谱进行校正处理。 作为其结果，可以在本地搜索单元（303）和多速率分度单元（304）中显着地减少量化子频段所需的比特数量而不显着降低质量。