公开(公告)号：US20080126082A1

公开(公告)日：2008-05-29

申请号：US11718437

申请日：2005-11-02

申请人： Hiroyuki Ehara ,  Masahiro Oshikiri ,  Koji Yoshida

发明人： Hiroyuki Ehara ,  Masahiro Oshikiri ,  Koji Yoshida

IPC分类号： G10L19/00

CPC分类号： G10L21/038 ,  G10L19/24

摘要： A scalable decoding apparatus capable of providing decoded audio signals of high quality having less degradation of a high frequency spectrum even when decoding audio signals by generating the high frequency spectrum by use of a low frequency spectrum. In the apparatus, an amplitude adjusting part (1211) uses different adjustment coefficients in accordance with the characteristic of first layer spectrum information to adjust the amplitude of a first layer decoded signal spectrum, and then outputs the amplitude-adjusted first layer decoded signal spectrum to a pseudo-spectrum generating part (1012). Using amplitude-adjusted first layer decoded signal spectrum received from the amplitude adjusting part (1211), the pseudo-spectrum generating part (1012) generates and outputs a pseudo-spectrum of high frequencies to a scaling part (1013). The scaling part (1013) scales the spectrum received from the pseudo-spectrum generating part (1012) and then outputs it to an adder (B).

摘要翻译： 即使在通过使用低频谱生成高频谱来解码音频信号的同时，也能够提供具有较低的高频谱劣化的高质量解码音频信号的可扩展解码装置。 在该装置中，振幅调整部（1211）根据第一层频谱信息的特性使用不同的调整系数来调整第一层解码信号频谱的振幅，然后将经调幅的第一层解码信号频谱输出到 伪频谱生成部（1012）。 使用从振幅调整部（1211）接收到的经调幅的第一层解码信号频谱，伪频谱生成部（1012）生成并将高频的伪频谱输出到缩放部（1013）。 缩放部分（1013）缩放从伪频谱生成部分（1012）接收的频谱，然后将其输出到加法器（B）。

公开(公告)号：US08135583B2

公开(公告)日：2012-03-13

申请号：US12819690

申请日：2010-06-21

申请人： Masahiro Oshikiri ,  Hiroyuki Ehara ,  Koji Yoshida

发明人： Masahiro Oshikiri ,  Hiroyuki Ehara ,  Koji Yoshida

IPC分类号： G10L19/02

CPC分类号： G10L21/038

摘要： An encoder, decoder, encoding method, and decoding method enabling acquisition of high-quality decoded signal in scalable encoding of an original signal in first and second layers even if the second or upper layer section performs low bit-rate encoding. In the encoder, a spectrum residue shape codebook stores candidates of spectrum residue shape vectors, a spectrum residue gain codebook stores candidates of spectrum residue gains, and a spectrum residue shape vector and a spectrum residue gain are sequentially outputted from the candidates according to the instruction from a search section. A multiplier multiplies a candidate of the spectrum residue shape vector by a candidate of the spectrum residue gain and outputs the result to a filtering section. The filtering section performs filtering by using a pitch filter internal state set by a filter state setting section, a lag T outputted by a lag setting section, and a spectrum residue shape vector which has undergone gain adjustment.

摘要翻译： 即使第二或上层部分执行低比特率编码，编码器，解码器，编码方法和解码方法能够在第一和第二层中的原始信号的可分级编码中获取高质量解码信号。 在编码器中，频谱残差形状码本存储频谱残差形状向量的候选，频谱残差增益码本存储频谱残差增益的候选，频谱残差形状矢量和频谱残差增益从根据指令的候选顺序输出 从搜索部分。 乘法器将频谱残差形状矢量的候选乘以频谱残差增益的候选，并将结果输出到滤波部分。 滤波部分通过使用由滤波器状态设置部分设置的音调滤波器内部状态，由滞后设置部分输出的延迟T和经过增益调整的频谱残差形状矢量进行滤波。

公开(公告)号：US20110125495A1

公开(公告)日：2011-05-26

申请号：US12990697

申请日：2009-06-18

申请人： Toshiyuki Morii ,  Hiroyuki Ehara ,  Koji Yoshida

发明人： Toshiyuki Morii ,  Hiroyuki Ehara ,  Koji Yoshida

IPC分类号： G10L19/00

CPC分类号： G10L19/008 ,  G10L25/27

摘要： Disclosed are a quantizer, encoder, and the methods thereof, wherein the computational load is reduced when the values related to the transform coefficients of the principal component analysis transform are quantized when a principal component analysis transform is applied to code stereo. A quantizer (110) is comprised of a power correlation calculation unit (111) which calculates the power (C11) of the left channel signal, the power (C22) of the right channel signal, and the correlation (C12) between the left channel signal and the right channel signal; an intermediate value calculation unit (112) which calculates the intermediate value (C1122) which is the difference between the power (C11) and the power (C22); a codebook (113) which holds a plurality of sets of the coefficients ?1,n,?2,n related to the transform coefficients of the principal component analysis transform and the code; and a quantizer (114) which calculates the sum of the first multiplication result obtained by multiplying the coefficient ?1,n by the correlation value C12 and the second multiplication result obtained by multiplying the coefficient ?1,n by the intermediate value C1122 as the cost function E, selects the coefficients ?1,n,?2,n where the cost function E becomes the maximum, and fetches the code related to the selected coefficients ?1,n,?2,n as the quantized code.

摘要翻译： 公开了一种量化器，编码器及其方法，其中当将主分量分析变换应用于代码立体声时，当与主成分分析变换的变换系数相关的值被量化时，计算负荷减小。 量化器（110）包括功率相关计算单元（111），其计算左声道信号的功率（C11），右声道信号的功率（C22）和左声道信号之间的相关性（C12） 信号和右声道信号; 计算作为功率（C11）和功率（C22）之间的差的中间值（C1122）的中间值计算单元（112）。 保存与主成分分析变换和代码的变换系数有关的多组系数α1，n，α2，n的码本（113）; 以及量化器（114），其计算通过将系数α1，n乘以相关值C12获得的第一相乘结果与通过将系数α1，n乘以中间值C1122而获得的第二乘法结果的和作为 成本函数E选择成本函数E变为最大的系数α1，n，β2，n，并且取出与所选择的系数α1，n，φ2，n相关的代码作为量化代码。

公开(公告)号：US07769584B2

公开(公告)日：2010-08-03

申请号：US11718452

申请日：2005-11-02

申请人： Masahiro Oshikiri ,  Hiroyuki Ehara ,  Koji Yoshida

发明人： Masahiro Oshikiri ,  Hiroyuki Ehara ,  Koji Yoshida

IPC分类号： G10L19/02

CPC分类号： G10L21/038

摘要： An encoder, decoder, encoding method, and decoding method enabling acquisition of high-quality decoded signal in scalable encoding of an original signal in first and second layers even if the second or upper layer section performs low bit-rate encoding. In the encoder, a spectrum residue shape codebook (305) stores candidates of spectrum residue shape vectors, a spectrum residue gain codebook (307) stores candidates of spectrum residue gains, and a spectrum residue shape vector and a spectrum residue gain are sequentially outputted from the candidates according to the instruction from a search section (306). A multiplier (308) multiplies a candidate of the spectrum residue shape vector by a candidate of the spectrum residue gain and outputs the result to a filtering section (303). The filtering section (303) performs filtering by using a pitch filter internal state set by a filter state setting section (302), a lag T outputted by a lag setting section (304), and a spectrum residue shape vector which has undergone gain adjustment.

摘要翻译： 即使第二或上层部分执行低比特率编码，编码器，解码器，编码方法和解码方法能够在第一和第二层中的原始信号的可分级编码中获取高质量解码信号。 在编码器中，频谱残差形状码本（305）存储频谱残差形状矢量的候补，频谱残差增益码本（307）存储频谱残差增益的候选，频谱残差形状矢量和频谱残差增益从 候选人根据来自搜索部分的指示（306）。 乘法器（308）将频谱残差形状矢量的候选乘以频谱残差增益的候选，并将结果输出到滤波部（303）。 滤波部（303）通过使用由滤波器状态设定部（302）设定的音调滤波器内部状态，由滞后设定部（304）输出的滞后T和进行了增益调整的频谱残差图形矢量进行滤波 。

公开(公告)号：US20080052066A1

公开(公告)日：2008-02-28

申请号：US11718452

申请日：2005-11-02

申请人： Masahiro Oshikiri ,  Hiroyuki Ehara ,  Koji Yoshida

发明人： Masahiro Oshikiri ,  Hiroyuki Ehara ,  Koji Yoshida

IPC分类号： G10L19/12

CPC分类号： G10L21/038

摘要： An encoder, decoder, encoding method, and decoding method enabling acquisition of high-quality decoded signal in scalable encoding of an original signal in first and second layers even if the second or upper layer section performs low bit-rate encoding. In the encoder, a spectrum residue shape codebook (305) stores candidates of spectrum residue shape vectors, a spectrum residue gain codebook (307) stores candidates of spectrum residue gains, and a spectrum residue shape vector and a spectrum residue gain are sequentially outputted from the candidates according to the instruction from a search section (306). A multiplier (308) multiplies a candidate of the spectrum residue shape vector by a candidate of the spectrum residue gain and outputs the result to a filtering section (303). The filtering section (303) performs filtering by using a pitch filter internal state set by a filter state setting section (302), a lag T outputted by a lag setting section (304), and a spectrum residue shape vector which has undergone gain adjustment.

摘要翻译： 即使第二或上层部分执行低比特率编码，编码器，解码器，编码方法和解码方法能够在第一和第二层中的原始信号的可分级编码中获取高质量解码信号。 在编码器中，频谱残差形状码本（305）存储频谱残差形状矢量的候补，频谱残差增益码本（307）存储频谱残差增益的候选，频谱残差形状矢量和频谱残差增益从 候选人根据来自搜索部分的指示（306）。 乘法器（308）将频谱残差形状矢量的候选乘以频谱残差增益的候选，并将结果输出到滤波部（303）。 滤波部（303）通过使用由滤波器状态设定部（302）设定的音调滤波器内部状态，由滞后设定部（304）输出的滞后T和进行了增益调整的频谱残差图形矢量进行滤波 。

公开(公告)号：US20070223577A1

公开(公告)日：2007-09-27

申请号：US11587379

申请日：2005-04-19

申请人： Hiroyuki Ehara ,  Koji Yoshida

发明人： Hiroyuki Ehara ,  Koji Yoshida

IPC分类号： H04N7/12

CPC分类号： G10L19/07 ,  G10L19/24

摘要： There is disclosed a scalable encoding device capable of increasing the conversion performance from a narrow-band LSP to a wide-band LSP (prediction accuracy when predicting the wide-band LSP from the narrow-band LSP) and realizing a high-performance band scalable LSP encoding. The device includes a conversion coefficient calculation unit (109) for calculating a conversion coefficient by using a narrow-band quantization LSP which has been outputted from a narrow-band LSP encoding unit (103) and a wide-band quantization LSP which has been outputted from a wide-band LSP encoding unit (107). The wide-band LSP encoding unit (107) multiplies the narrow-band quantization LSP with the conversion coefficient inputted from the conversion coefficient calculation unit (109) so as to convert it into a wide-band LSP. The wide-band LSP is multiplied by a weight coefficient to calculate a prediction wide-band LSP. The wide-band LSP encoding unit (107) encodes an error signal between the obtained prediction wide-band LSP and the wide-band LSP so as to obtain a wide-band quantization LSP.

摘要翻译： 公开了一种能够提高从窄带LSP到宽带LSP的转换性能的可伸缩编码装置（预测来自窄带LSP的宽带LSP的预测精度），实现高性能频带可伸缩性 LSP编码。 该装置包括转换系数计算单元（109），用于通过使用从窄带LSP编码单元（103）输出的窄带量化LSP和已经输出的宽带量化LSP来计算转换系数 来自宽带LSP编码单元（107）。 宽带LSP编码单元（107）将窄带量化LSP与从转换系数计算单元（109）输入的转换系数相乘，以将其转换为宽带LSP。 宽带LSP乘以权重系数以计算预测宽带LSP。 宽带LSP编码单元（107）对获得的预测宽带LSP与宽带LSP之间的误差信号进行编码，以获得宽带量化LSP。

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：US08725501B2

公开(公告)日：2014-05-13

申请号：US11632770

申请日：2005-07-14

申请人： Hiroyuki Ehara

发明人： Hiroyuki Ehara

IPC分类号： G10L21/02 ,  G10L21/00

CPC分类号： G10L19/083 ,  G10L19/005 ,  G10L2019/0011

摘要： There is disclosed an audio decoding device capable of improving audio quality of a decoded signal by considering the energy change of a past signal in eracure concealment processing. In this device, an energy change calculation unit (143) calculates an average energy of an audio source signal of one-pitch cycle from the end of the ACB vector outputted from an adaptive codebook (106). Moreover, the energy change calculation unit (143) calculates a ratio of the average energy of the current sub-frame and the sub-frame immediately before and outputs the ratio to an ACB gain generation unit (135). The ACB gain generation unit (135) outputs a conceal processing ACB gain defined by the ACB gain decoded in the past or information on the energy change ratio outputted from the energy change calculation unit (143) to a multiplier (132).

摘要翻译： 公开了一种音频解码装置，其能够通过考虑在擦除隐藏处理中的过去信号的能量变化来改善解码信号的音频质量。 在该装置中，能量变化计算部（143）从自适应码本（106）输出的ACB矢量的结尾计算出一音节周期的音频源信号的平均能量。 此外，能量变化计算单元（143）计算当前子帧和紧接着的子帧的平均能量的比率，并将该比率输出到ACB增益生成单元（135）。 ACB增益生成单元（135）输出由过去解码的ACB增益定义的隐藏处理ACB增益或从能量变化计算单元（143）输出的能量变化率的信息到乘法器（132）。

公开(公告)号：US20140099966A1

公开(公告)日：2014-04-10

申请号：US14123333

申请日：2012-05-25

申请人： Takako Hori ,  Hiroyuki Ehara

发明人： Takako Hori ,  Hiroyuki Ehara

IPC分类号： H04W72/04

CPC分类号： H04W36/0022 ,  H04W72/04 ,  H04W76/22 ,  H04W88/181

摘要： The objective of the present invention is to suppress deterioration of call quality caused by transcoding without interrupting a call even if a codec used by one of the terminals during communication is changed. A modification determination unit, in the case of detecting a modification of a codec used by one terminal of two terminals, determines whether or not to constrain the bandwidth of the first codec using a first codec of the other terminal and a second codec after modification by the first-mentioned one of the terminals. A signaling generation unit transmits, to the other terminal, signaling for limiting the bandwidth if the bandwidth is to be limited.

摘要翻译： 本发明的目的在于，即使通信中的终端之一使用的编解码器被改变，也可以抑制代码转换引起的呼叫质量的恶化，而不会中断呼叫。 在检测到由两个终端的一个终端使用的编解码器的修改的情况下，修改确定单元确定是否使用另一终端的第一编解码器限制第一编解码器的带宽，并且修改后由第二编解码器 首先提到的一个终端。 如果要限制带宽，则信令生成单元向另一终端发送用于限制带宽的信令。

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。