公开(公告)号：US20120185242A1

公开(公告)日：2012-07-19

申请号：US13302677

申请日：2011-11-22

申请人： Toshiyuki MORII

发明人： Toshiyuki MORII

IPC分类号： G10L21/02

CPC分类号： G10L19/135 ,  G10L19/12 ,  G10L2019/0007 ,  G10L2019/0013

摘要： A noise estimating apparatus estimates two types of noise spectra for removing a noise component using the two types of noise spectra. The noise estimating apparatus includes an A/D converter that converts an input speech signal to a digital signal, and a Fourier transformer that performs a discrete Fourier transform on the digital signal having a predetermined time length to obtain an input spectrum and a complex spectrum. The noise estimating apparatus also includes a noise spectrum storage device that stores the two types of noise spectra, including a mean noise spectrum and a compensation noise spectrum, and a noise estimator that estimates a new compensation noise spectrum and a new mean noise spectrum as new two types of noise spectra.

摘要翻译： 噪声估计装置使用两种类型的噪声谱估计用于去除噪声分量的两种类型的噪声谱。 噪声估计装置包括将输入语音信号转换为数字信号的A / D转换器和对具有预定时间长度的数字信号执行离散付里叶变换以获得输入频谱和复谱的傅里叶变换器。 噪声估计装置还包括存储包括平均噪声频谱和补偿噪声频谱的两种噪声谱的噪声谱存储装置，以及将新的补偿噪声谱和新的平均噪声谱估计为新的噪声估计器 两种噪声谱。

公开(公告)号：US08185385B2

公开(公告)日：2012-05-22

申请号：US12767271

申请日：2010-04-26

申请人： Eung-Don Lee ,  Do-Young Kim

发明人： Eung-Don Lee ,  Do-Young Kim

IPC分类号： G01L19/00 ,  G01L19/12 ,  H04L12/66

CPC分类号： G10L19/032 ,  G10L2019/0013

摘要： The present research can decrease the amount of computation and enhance speech quality by using a global pulse replacement method in a fixed codebook search. The fixed codebook search method in a speech encoder based upon global pulse replacement, includes the steps of: (a) computing absolute values of the pulse-position likelihood-estimator vectors; (b) temporarily obtaining a codebook vector; (c) computing a mathematical equation by replacing a pulse; (d) determining whether a value computed based upon the mathematical equation is increased after pulse replacement; (e) obtaining a new codebook vector by replacing the pulse; and (f) maintaining a previous codebook vector.

摘要翻译： 本研究可以通过在固定码本搜索中使用全局脉冲替换方法来减少计算量并提高语音质量。 基于全局脉冲替换的语音编码器中的固定码本搜索方法包括以下步骤：（a）计算脉冲位置似然估计器矢量的绝对值; （b）暂时获得码本矢量; （c）通过替换脉冲来计算数学方程; （d）确定在脉冲置换之后基于数学方程计算的值是否增加; （e）通过替换脉冲获得新的码本矢量; 和（f）保持先前的码本向量。

公开(公告)号：US20100324892A1

公开(公告)日：2010-12-23

申请号：US12870122

申请日：2010-08-27

申请人： Kazutoshi YASUNAGA ,  Toshiyuki MORII ,  Taisuke WATANABE

发明人： Kazutoshi YASUNAGA ,  Toshiyuki MORII ,  Taisuke WATANABE

IPC分类号： G10L19/04

CPC分类号： G10L19/135 ,  G10L19/12 ,  G10L2019/0007 ,  G10L2019/0013

摘要： A code excited linear prediction type speech coder, which includes a seed storage that stores seeds used as an initial state of oscillation, and an oscillator that generates different vector sequences in accordance with values of the seeds stored in the seed storage and outputs the vector sequences as excitation vectors. The speech coder also includes a linear predictive coding synthesis filter that receives, as input, the excitation vectors, which are the vector sequences generated in accordance with the values of the seeds, that synthesizes the excitation vectors, and that outputs a synthesized speech.

公开(公告)号：US07809557B2

公开(公告)日：2010-10-05

申请号：US12134256

申请日：2008-06-06

申请人： Toshiyuki Morii

发明人： Toshiyuki Morii

IPC分类号： G10L19/00

CPC分类号： G10L19/135 ,  G10L19/12 ,  G10L2019/0007 ,  G10L2019/0013

摘要： A speech encoder includes an adaptive codebook that generates an adaptive codevector representing a pitch component, a random codebook that generates a random codevector representing a random component, and a synthesis filter that generates a synthetic speech signal by being excited by the adaptive codevector and the random codevector. The random codebook includes an input vector provider configured to provide an input vector, and an excitation vector generator configured to generate an excitation vector as the random codevector by dispersing the input vector by using a fixed pattern. A length of the fixed pattern is shorter than a length of a sub-frame.

摘要翻译： 语音编码器包括：生成表示音调分量的自适应码矢量的自适应码本，生成表示随机分量的随机码矢的随机码本，以及通过自适应码矢和随机的自适应码矢量产生合成语音信号的合成滤波器 码矢量。 所述随机码本包括被配置为提供输入向量的输入向量提供器，以及被配置为通过使用固定模式分散所述输入向量来生成作为所述随机码矢量的激励矢量的激励矢量生成器。 固定图案的长度比子框架的长度短。

公开(公告)号：US20100191526A1

公开(公告)日：2010-07-29

申请号：US12670777

申请日：2008-07-25

申请人： Toshiyuki Morii

发明人： Toshiyuki Morii

IPC分类号： G10L19/00 ,  G10L21/02

CPC分类号： G10L19/107 ,  G10L2019/0013

摘要： An audio encoding device which can improve encoding performance while performing division search on an algebraic codebook in an audio encoding. In a distortion minimizing unit (112) of a CELP encoding device: a maximum correlation value calculation unit (221) calculates a correlation value by using each pulse and a target signal in each candidate position for four pulses constituting the fixed codebook so as to acquire a maximum value of the correlation value for each pulse and calculates a maximum correlation value by using the maximum value of the correlation value; a sorting unit (222) divides the four pulses into two subsets each having two pulses; and a search unit (224) performs a division search on the fixed codebook and acquires a code indicating the positions and polarities of the four pulses where the encoding distortion is minimum.

摘要翻译： 一种音频编码装置，其可以在对音频编码中的代数码本执行划分搜索时提高编码性能。 在CELP编码装置的失真最小化单元（112）中：最大相关值计算单元（221）通过使用构成固定码本的四个脉冲的每个候选位置中的每个脉冲和目标信号来计算相关值，以便获得 每个脉冲的相关值的最大值，并通过使用相关值的最大值来计算最大相关值; 分类单元（222）将四个脉冲分成具有两个脉冲的两个子集; 搜索单元（224）对固定码本执行划分搜索并且获取指示编码失真最小的四个脉冲的位置和极性的代码。

公开(公告)号：US20100153100A1

公开(公告)日：2010-06-17

申请号：US12553736

申请日：2009-09-03

申请人： Byun Kyung Jin ,  Koo Bon Tae ,  Eum Nak Woong

发明人： Byun Kyung Jin ,  Koo Bon Tae ,  Eum Nak Woong

IPC分类号： G10L19/00

CPC分类号： G10L19/107 ,  G10L2019/0008 ,  G10L2019/0013

摘要： An address generator for searching an algebraic codebook is disclosed. The address generator includes: a multiplier multiplying the dimension and a width value of a correlation matrix; a first adder adding a length value and an offset address of the correlation matrix; and a second adder adding the results of the multiplier and the first adder to generate an address for algebraic codebook searching. The amount of calculation required for an address calculation to search an algebraic codebook can be reduced.

摘要翻译： 公开了一种用于搜索代数码本的地址发生器。 地址生成器包括：乘法器，乘以相关矩阵的维度和宽度值; 第一加法器，相加矩阵的长度值和偏移地址; 以及将乘法器和第一加法器的结果相加以生成代数码本搜索的地址的第二加法器。 可以减少地址计算所需的搜索代数码本所需的计算量。

公开(公告)号：US07496504B2

公开(公告)日：2009-02-24

申请号：US10671266

申请日：2003-09-24

申请人： Eung Don Lee ,  Do Young Kim ,  Bong Tae Kim

发明人： Eung Don Lee ,  Do Young Kim ,  Bong Tae Kim

IPC分类号： G01L19/00 ,  G01L19/12

CPC分类号： G10L19/12 ,  G10L2019/0013

摘要： Provided are a combined, fixed codebook searching method and apparatus used in a code excited linear prediction (CELP) speech codec. The method is used in a code excited linear prediction (CELP) speech codec, and includes searching for a fixed codebook using a full search method that searches for the fixed codebook at all pulse positions; selecting a fixed codebook searching method by counting the number of users who are accessing a gateway, comparing the number of users with a predetermined threshold, and selecting a proper fixed codebook searching method based on the result of comparison; searching for the fixed codebook using the selected fixed codebook searching method; and checking whether the search for the fixed codebook is complete for all tracks of the CELP speech codec, terminating a routine of searching for the fixed codebook when it is determined the search is complete for all the tracks, and selecting a fixed codebook searching method again in consideration of the number of gateway users when there remains a track to be searched for. Accordingly, a fixed codebook searching method is selected in consideration of the number of users who are accessing a gateway, thereby enabling an effective adjustment of either the quality of sound or the channel capacity of the gateway.

摘要翻译： 提供了一种在代码激励线性预测（CELP）语音编解码器中使用的组合固定码本搜索方法和装置。 该方法用于代码激励线性预测（CELP）语音编解码器，并且包括使用在所有脉冲位置搜索固定码本的全搜索方法来搜索固定码本; 通过对正在接入网关的用户数进行计数，将用户数与预定阈值进行比较，并且基于比较结果选择适当的固定码本搜索方法来选择固定码本搜索方法; 使用所选择的固定码本搜索方法搜索固定码本; 并检查固定码本的搜索对于CELP语音编解码器的所有轨道是否完整，当确定所有轨道的搜索完成时终止搜索固定码本的例程，并再次选择固定码本搜索方法 考虑到当存在要搜索的轨道时的网关用户的数量。 因此，考虑到正在访问网关的用户的数量来选择固定的码本搜索方法，从而能够有效地调整网关的声音质量或信道容量。

公开(公告)号：US20080015852A1

公开(公告)日：2008-01-17

申请号：US11827778

申请日：2007-07-13

申请人： Hauke Kruger ,  Peter Vary

发明人： Hauke Kruger ,  Peter Vary

IPC分类号： G10L19/14

CPC分类号： G10L19/12 ,  G10L2019/0004 ,  G10L2019/0007 ,  G10L2019/0013 ,  H04R25/554

摘要： A wideband audio coding concept is presented that provides good audio quality at bit rates below 3 bits per sample with an algorithmic delay of less than 10 ms. The concept is based on the principle of Linear Predictive Coding (LPC) in an analysis-by-synthesis framework. A spherical codebook is used for quantisation at bit rates which are higher in comparison to low bit rate speech coding for improved performance for audio signals. For superior audio quality, noise shaping is employed to mask the coding noise. In order to reduce the computational complexity of the encoder, the analysis-by synthesis framework has been adapted for the spherical codebook to enable a very efficient excitation vector search procedure. Furthermore, auxiliary information gathered in advance is employed to reduce a computational encoding and decoding complexity at run time significantly. This auxiliary information can be considered as the SCELP codebook. Due to the consideration of the characteristics of the apple-peeling-code construction principle, this codebook can be stored very efficiently in a read-only-memory.

摘要翻译： 提出了一种宽带音频编码概念，在每个样本低于3位的比特率下提供良好的音频质量，算法延迟小于10 ms。 该概念基于分析综合框架中线性预测编码（LPC）的原理。 与用于改善音频信号性能的低比特率语音编码相比，球面码本被用于量化比特率。 为了优越的音频质量，采用噪声整形来掩蔽编码噪声。 为了降低编码器的计算复杂度，分析合成框架已经适用于球形码本，以实现非常有效的激励矢量搜索过程。 此外，采用预先收集的辅助信息显着减少运行时的计算编码和解码复杂度。 该辅助信息可以被认为是SCELP码本。 由于考虑到苹果剥皮码构造原理的特点，该码本可以非常有效地存储在只读存储器中。

公开(公告)号：US07206739B2

公开(公告)日：2007-04-17

申请号：US10155272

申请日：2002-05-23

申请人： Dae-Ryong Lee

发明人： Dae-Ryong Lee

IPC分类号： G10L21/00 ,  G10L19/14 ,  G10L15/00

CPC分类号： G10L19/12 ,  G10L2019/0013

摘要： A method for searching an excitation (or fixed) codebook in a speech coding system. In a speech coding system including a synthesis filter for synthesizing a speech signal, a fixed codebook searcher according to the present invention segments a speech signal frame into a plurality of subframes to generate an excitation signal to be used in a synthesis filter, segments again each of the subframes into a plurality of subgroups, and searches the respective subframes each comprised of a plurality of pulse position/amplitude combinations for pulses. The fixed codebook searcher searches the respective subgroups for a predetermine number of pulses having non-zero amplitude, and generates the searched pulses as an initial vector. Next, the fixed codebook searcher selects a pulse combination including at least one pulse among the pulses of the initial vector, and then substitutes pulses of the selected pulse combination for pulses in other positions in the subgroups. The selection and the substitution are repeatedly performed on all the pulses of the initial vector.

摘要翻译： 一种在语音编码系统中搜索激励（或固定）码本的方法。 在包括用于合成语音信号的合成滤波器的语音编码系统中，根据本发明的固定码本搜索器将语音信号帧划分成多个子帧，以产生要在合成滤波器中使用的激励信号， 的子帧转换成多个子组，并且搜索各个子帧，每个子帧由多个脉冲位置/振幅组合构成，用于脉冲。 固定码本搜索器在各个子组中搜索具有非零幅度的预定数量的脉冲，并且生成搜索到的脉冲作为初始向量。 接下来，固定码本搜索器选择包括初始矢量的脉冲中的至少一个脉冲的脉冲组合，然后将所选择的脉冲组合的脉冲替换为子组中其他位置的脉冲。 在初始向量的所有脉冲上重复执行选择和替换。

公开(公告)号：US07096181B2

公开(公告)日：2006-08-22

申请号：US10277874

申请日：2002-10-23

申请人： Sung Kyo Jung ,  Yong Soo Choi ,  Sung Wan Yoon ,  Kyung Tae Kim ,  Dae Hee Youn

发明人： Sung Kyo Jung ,  Yong Soo Choi ,  Sung Wan Yoon ,  Kyung Tae Kim ,  Dae Hee Youn

IPC分类号： G10L19/14

CPC分类号： G10L19/00 ,  G10L2019/0013

摘要： A method for searching a codebook which predicts a residual element of an input voice signal includes combining each track of the input signal, forming track units including at least two tracks, and determining a pulse code for each track. The method further includes calculating energy for each track using an energy formula including a vector dot product, arranging or selecting codewords in a small track energy order, and searching or selecting an optimal pulse for a single- or double-pulse track of the selected codeword.