公开(公告)号：US08315853B2

公开(公告)日：2012-11-20

申请号：US12155542

申请日：2008-06-05

Applicant: Hyun-woo Kim ,  Jong-mo Sung ,  Mi-suk Lee ,  Do-young Kim ,  Byung-sun Lee

Inventor： Hyun-woo Kim ,  Jong-mo Sung ,  Mi-suk Lee ,  Do-young Kim ,  Byung-sun Lee

IPC: G06F15/00 ,  G10L11/00 ,  G10L19/00 ,  G10L21/00 ,  G10L19/14 ,  G10L19/12 ,  G10L21/02

CPC classification number: G10L19/26 ,  G10L19/0212

Abstract: A post-filtering apparatus and method for speech enhancement in a modified discrete cosine transform (MDCT) domain are disclosed. In the apparatus and method, previous and current MDCT coefficients are used for obtaining a speech spectrum coefficient similar to a real speech spectrum, and a convex function is used for transforming the speech spectrum coefficient and obtaining a post-filter coefficient so that difference can increase in the case where the speech spectrum coefficient is small but decrease in the case where the coefficient is large. Then, the post-filter coefficient is applied to the MDCT coefficient. With this configuration, both the current and previous MDCT values are used, so that it is possible to obtain a spectrum coefficient similar to the real speech spectrum and to obtain a more accurate filter coefficient. Further, the coefficient is adaptively transformed through the convex function, thereby enhancing speech quality.

Abstract translation: 公开了一种用于修正的离散余弦变换（MDCT）域中的语音增强的后置滤波装置和方法。 在该装置和方法中，先前和当前的MDCT系数被用于获得类似于真实语音频谱的语音频谱系数，并且使用凸函数来变换语音频谱系数并获得后置滤波器系数，使得差值可以增加 在语音频谱系数小的情况下，在系数大的情况下减少。 然后，将后滤波器系数应用于MDCT系数。 利用该配置，使用当前和先前的MDCT值，使得可以获得与真实语音频谱相似的频谱系数并获得更准确的滤波器系数。 此外，系数通过凸函数自适应地变换，从而提高语音质量。

公开(公告)号：US08265929B2

公开(公告)日：2012-09-11

申请号：US11297686

申请日：2005-12-07

Applicant: Mi-Suk Lee ,  Do-Young Kim ,  JongMo Sung ,  Hyun-Woo Kim

Inventor： Mi-Suk Lee ,  Do-Young Kim ,  JongMo Sung ,  Hyun-Woo Kim

IPC: G10L19/02

CPC classification number: G10L19/24 ,  G10L19/083 ,  G10L19/10

Abstract: Provides is an embedded code-excited linear prediction speech coding/decoding apparatus and method that can deal with the capacity change of speech transmission channel by modeling an error signal not coded at a core speech coder based on a transmission rate in a multiple pulse search mode or gain compensation mode and then transmitting it in an optimum mode. The apparatus includes a core speech coding unit for coding an input speech signal with spectral envelop and an excitation signal, a transmission rate determination unit for allocating the number of bits additionally allowed depending on a capacity of a transmission channel, and an embedded excitation signal coding unit for coding a residual excitation signal that is not coded in the core speech coding unit based on the number of additionally allowed bits using one of a multiple pulse excitation coding mode and a gain compensation mode.

Abstract translation: 提供一种嵌入式码激励线性预测语音编码/解码装置和方法，可以通过对基于多脉冲搜索模式中的传输速率的核心语音编码器对未编码的误差信号进行建模来处理语音传输信道的容量变化 或增益补偿模式，然后以最佳模式发送。 该装置包括：核心语音编码单元，用于对具有频谱包络和激励信号的输入语音信号进行编码;传输速率确定单元，用于根据传输信道的容量分配额外容许的比特数;以及嵌入式激励信号编码 用于使用多脉冲激励编码模​​式和增益补偿模式中的一种，基于使用附加允许位的数量来编码不在核心语音编码单元中编码的残余激励信号的单元。

公开(公告)号：US07599833B2

公开(公告)日：2009-10-06

申请号：US11441955

申请日：2006-05-26

Applicant: Jong-Mo Sung ,  Hyun-Woo Kim ,  Mi-Suk Lee ,  Do-Young Kim

Inventor： Jong-Mo Sung ,  Hyun-Woo Kim ,  Mi-Suk Lee ,  Do-Young Kim

IPC: G10L19/00 ,  G10L19/12

CPC classification number: G10L21/038 ,  G10L19/0212 ,  G10L19/035 ,  G10L19/06 ,  G10L19/24

Abstract: Provided is a residual signal coding/decoding apparatus and method. The residual signal coding apparatus includes a transformer, an LPC coefficient extractor, an LPC coefficient quantizer, an LP analysis filter, a band splitter, a pulse searcher, and a pulse quantizer. The transformer transforms time-domain residual signals into a frequency domain to output transform coefficients. The LPC coefficient extractor extracts LPC coefficients from the transform coefficients. The LPC coefficient quantizer quantizes the LPC coefficients to output quantized LPC coefficients and corresponding indices. The LP analysis filter performs an LP analysis on the transform coefficients to output LP residual transform coefficients. The band splitter splits the LP residual transform coefficients into bands to output the LP residual transform coefficients. The pulse searcher searches the LP residual transform coefficients for the respective bands to select optimal pulses and output parameters of the optimal pulses. The pulse quantizer quantizes the parameters of the optimal pulses.

Abstract translation: 提供了一种残留信号编码/解码装置和方法。 残余信号编码装置包括变压器，LPC系数提取器，LPC系数量化器，LP分析滤波器，带分离器，脉冲搜索器和脉冲量化器。 变压器将时域残差信号变换为频域，输出变换系数。 LPC系数提取器从变换系数中提取LPC系数。 LPC系数量化器量化LPC系数以输出量化的LPC系数和相应的索引。 LP分析滤波器对变换系数执行LP分析以输出LP残差变换系数。 频带分离器将LP残差变换系数分解成频带以输出LP残差变换系数。 脉冲搜索器搜索各个频带的LP残差变换系数，以选择最佳脉冲和最佳脉冲的输出参数。 脉冲量化器对最佳脉冲的参数进行量化。