公开(公告)号：US06691092B1

公开(公告)日：2004-02-10

申请号：US09542390

申请日：2000-04-04

Applicant: Bangalore R. Udaya Bhaskar ,  Srinivas Nandkumar ,  Kumar Swaminathan ,  Gaguk Zakaria

Inventor： Bangalore R. Udaya Bhaskar ,  Srinivas Nandkumar ,  Kumar Swaminathan ,  Gaguk Zakaria

IPC: G10L1304

CPC classification number: G10L19/097 ,  G10L2025/783

Abstract: A system determines a voicing measure as a measure of the degree of signal periodicity and uses the determined voicing measure to quantize the spectral magnitude of the slowly evolving waveform (SEW) and the modeling of the SEW and rapidly evolving waveform (REW) phase spectra.

Abstract translation: 系统将发声测量值确定为信号周期程度的度量，并使用确定的发声测量来量化慢速演化波形（SEW）的频谱幅度以及SEW和快速演变波形（REW）相位谱的建模。

公开(公告)号：US5734789A

公开(公告)日：1998-03-31

申请号：US229271

申请日：1994-04-18

Applicant: Kumar Swaminathan ,  Kalyan Ganesan ,  Prabhat K. Gupta

Inventor： Kumar Swaminathan ,  Kalyan Ganesan ,  Prabhat K. Gupta

IPC: G10L11/04 ,  G10L11/06 ,  G10L19/00 ,  G10L19/12 ,  G10L19/14 ,  G10L9/00

CPC classification number: G10L19/012 ,  G10L19/12 ,  G10L19/26 ,  G10L25/90 ,  G10L25/09 ,  G10L25/18 ,  G10L25/24 ,  G10L25/93

Abstract: A bit rate Codebook Excited Linear Predictor (CELP) communication system which includes a transmitter that organizes a signal containing speech into frames of 40 millisecond duration, and classifies each frame as one of three modes: voiced and stationary, unvoiced or transient, and background noise.

Abstract translation: 一种比特率码本激励线性预测器（CELP）通信系统，其包括将包含语音的信号组织成40毫秒持续时间的帧的发射机，并将每个帧分类为三种模式之一：有声和静态，无声或瞬态，以及背景噪声 。

公开(公告)号：US5704000A

公开(公告)日：1997-12-30

申请号：US337595

申请日：1994-11-10

Applicant: Kumar Swaminathan ,  Murthy Vemuganti

Inventor： Kumar Swaminathan ,  Murthy Vemuganti

IPC: G10L25/90 ,  G10L5/00

CPC classification number: G10L25/90

Abstract: A pitch estimating method includes the steps of (1) determining a set of pitch candidates to estimate a pitch of a digitized speech signal at each of a plurality of time instants, wherein series of these time instants define segments of the digitized speech signal; (2) constructing a pitch contour using a pitch candidate selected from each of the sets of pitch candidates determined in the first step; and (3) selecting a representative pitch estimate for the digitized speech signal segment from the set of pitch candidates comprising the pitch contour.

Abstract translation: 音调估计方法包括以下步骤：（1）确定一组音调候选以估计多个时刻中的每个时刻的数字化语音信号的音高，其中这些时刻的系列定义数字化语音信号的片段; （2）使用从第一步骤中确定的每个音调候选集中选择的音调候选来构造音调轮廓; 以及（3）从包括音调轮廓的音调候选集合中选择用于数字化语音信号段的代表音调估计。

公开(公告)号：US5630016A

公开(公告)日：1997-05-13

申请号：US614777

申请日：1996-03-07

Applicant: Kumar Swaminathan ,  Brian M. McCarthy

Inventor： Kumar Swaminathan ,  Brian M. McCarthy

IPC: G10L19/00 ,  G10L9/00

CPC classification number: G10L19/012

Abstract: A digital discontinuous cellular communication system has a transmitter that transmits two frames of data following detection of voice inactivity. A receiver includes a comfort noise generator that uses the two frames of data to output noise to the speaker during period of voice inactivity. The comfort noise generator includes synthesis codebook with samples scaled by actual background noise and excitation codebook with samples filtered and scaled by the background noise that are combined to produce comfort noise having attributes and loudness level of the received background noise prior to interruption of transmission. The scaled signals are weighted to vary the loudness level and spectral attributes.

Abstract translation: 数字不连续的蜂窝通信系统具有在检测到语音不活动之后发送两帧数据的发射机。 接收机包括舒适噪声发生器，其在语音不活动期间使用两帧数据来向扬声器输出噪声。 舒适噪声发生器包括具有通过实际背景噪声缩放的样本的合成码本和激励码本，其中滤波和被背景噪声缩放的样本被组合以产生在传输中断之前具有接收到的背景噪声的属性和响度水平的舒适噪声。 加权比例的信号以改变响度级别和频谱属性。

公开(公告)号：US5537509A

公开(公告)日：1996-07-16

申请号：US890747

申请日：1992-05-28

Applicant: Kumar Swaminathan ,  Brian M. McCarthy

Inventor： Kumar Swaminathan ,  Brian M. McCarthy

IPC: G10L19/00 ,  H04B7/26 ,  H04J3/17 ,  H04L12/28 ,  H04L12/56 ,  H04W28/06 ,  H04W72/04 ,  G10L9/00

CPC classification number: H04W72/044 ,  G10L19/012 ,  H04B7/26 ,  H04B7/2643 ,  H04J3/172 ,  H04W28/06 ,  H04W72/0406

Abstract: A digital discontinuous cellular communication system has a transmitter that transmits two frames of data following detection of voice inactivity. A receiver includes a comfort noise generator that uses the two frames of data to output noise to the speaker during period of voice inactivity. The comfort noise generator includes synthesis codebook with samples scaled by actual background noise and excitation codebook with samples filtered and scaled by the background noise that are combined to produce comfort noise having attributes and loudness level of the received background noise prior to interruption of transmission. The scaled signals are weighted to vary the loudness level and spectral attributes.

Abstract translation: 数字不连续的蜂窝通信系统具有在检测到语音不活动之后发送两帧数据的发射机。 接收机包括舒适噪声发生器，其在语音不活动期间使用两帧数据来向扬声器输出噪声。 舒适噪声发生器包括具有通过实际背景噪声缩放的样本的合成码本和激励码本，其中滤波和被背景噪声缩放的样本被组合以产生在传输中断之前具有接收到的背景噪声的属性和响度水平的舒适噪声。 加权比例的信号以改变响度级别和频谱属性。