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。

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：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：US08438020B2

公开(公告)日：2013-05-07

申请号：US12682086

申请日：2008-10-10

申请人： Kaoru Satoh ,  Toshiyuki Morii ,  Hiroyuki Ehara

发明人： Kaoru Satoh ,  Toshiyuki Morii ,  Hiroyuki Ehara

IPC分类号： G10L21/00

CPC分类号： G10L19/032 ,  G10L19/07 ,  G10L19/18 ,  G10L2019/0005

摘要： A vector quantizer which improves the accuracy of vector quantization in switching over a vector quantization codebook on a first stage depending on the type of feature having the correlation with a quantization target vector. In the vector quantizer, a classifier generates classification information representing a type of narrowband LSP vector having the correlation with wideband LSP (Line Spectral Pairs) of the plural types. A first codebook selects one sub-codebook corresponding to the classification information as a codebook used for the quantization of the first stage from plural sub-codebooks corresponding to each of the types of narrowband LSP vectors. A multiplier multiplies the quantization residual vector of the first stage inputted from an adder by a scaling factor corresponding to the classification information of plural scaling factors stored in a scaling factor determiner and outputs it to an adder as the quantization target of a second stage.

摘要翻译： 矢量量化器，其根据与量化目标矢量具有相关性的特征的类型，提高在第一级切换矢量量化码本时的矢量量化的精度。 在矢量量化器中，分类器生成表示与多种类型的宽带LSP（线谱对）具有相关性的窄带LSP矢量的类型的分类信息。 第一码本从对应于每种类型的窄带LSP矢量的多个子码本中选择与分类信息相对应的一个子码本作为用于第一级的量化的码本。 乘法器将从加法器输入的第一级的量化残差矢量乘以与存储在缩放因子确定器中的多个缩放因子的分类信息相对应的缩放因子，并将其作为第二级的量化对象输出到加法器。

公开(公告)号：US08271272B2

公开(公告)日：2012-09-18

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： G10L19/00

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：US20120215527A1

公开(公告)日：2012-08-23

申请号：US13505093

申请日：2010-11-11

申请人： Tomofumi Yamanashi ,  Toshiyuki Morii ,  Hiroyuki Ehara

发明人： Tomofumi Yamanashi ,  Toshiyuki Morii ,  Hiroyuki Ehara

IPC分类号： G10L19/02

CPC分类号： G10L21/038 ,  G10L19/24

摘要： There is disclosed an encoder apparatus whereby, when a band expanding technique for encoding, based on the spectral data of a lower frequency portion, the spectral data of a higher frequency portion is applied to a lower layer in a hierarchical encoding/decoding system, an efficient encoding can be performed in an upper layer as well, thereby improving the decoded-signal quality. In an encoder apparatus (101), a second layer decoder unit (207) calculates a spectrum (differential spectrum), which is to be encoded in a third layer encoder unit (210) that is an upper layer of the second layer decoder unit (207), by applying such an ideal gain (first gain parameter a1) that minimizes the energy of the differential spectrum.

摘要翻译： 公开了一种编码器装置，其中当基于较低频率部分的频谱数据进行编码的频带扩展技术时，较高频率部分的频谱数据被应用于分级编码/解码系统中的较低层， 也可以在上层执行高效编码，从而提高解码信号质量。 在编码器装置（101）中，第二层解码单元（207）计算要在第二层解码器单元的上层的第三层编码器单元（210）中编码的频谱（差分频谱） 207），通过应用使差分频谱的能量最小化的理想增益（第一增益参数a1）。

公开(公告)号：US08204745B2

公开(公告)日：2012-06-19

申请号：US13158944

申请日：2011-06-13

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 encoding apparatus and method for generating low-frequency-band encoding information and high-frequency-band encoding information from an original signal. The encoding apparatus includes a first spectrum calculator that calculates a first spectrum of a low frequency band from a decoded signal of the low-frequency-band encoding information, a second spectrum calculator that calculates a second spectrum from the original signal, an estimator that divides a high frequency band of the second spectrum into a plurality of bands and estimates the second spectrum included in each band, using the first spectrum, and a first error component encoder that encodes a first error component between the high frequency band of the second spectrum and an estimated spectrum. A corresponding decoding apparatus and method provides decoding.

摘要翻译： 一种用于从原始信号产生低频带编码信息和高频带编码信息的编码装置和方法。 编码装置包括：第一频谱计算器，根据低频带编码信息的解码信号计算低频带的第一频谱;第二频谱计算器，从原始信号计算第二频谱;估计器，其将 将第二频谱的高频带转换成多个频带，并使用第一频谱估计包括在每个频带中的第二频谱，以及第一误差分量编码器，其对第二频谱的高频带和 估计频谱。 相应的解码装置和方法提供解码。