公开(公告)号：WO02060075A2

公开(公告)日：2002-08-01

申请号：PCT/US0201901

申请日：2002-01-23

Applicant: QUALCOMM INC

Inventor： EL-MALEH KHALED H ,  ANANTHAPADMANABHAN ARASANIPALA ,  DEJACO ANDREW P

IPC: G10L21/04 ,  G10L13/00 ,  G10L19/14 ,  H04B1/00

CPC classification number: G10L21/038 ,  G10L19/26

Abstract: Wideband speech signal must be converted to narrowband speech signals if the transmission medium or the destination termianl is constructed with narrowband constraints. A typical wideband-to-narrowband conversion method is the elimination of frequencies above 3400 Hz using a low pass filter and a down sampler. Howerver, this method producesa muffled speech sound since the resulting narrowband signal has a flat frequency response. Methods and apparatus are presented herein to enhance the acoustinc quality of a wideband-to-narrowband converted signal. A bandwidth switching filter (68) is used to emphasize a mid-range frequency portion of the wideband signal to that the resulting narrowband signal has a non-falt frequency spectrum.

Abstract translation: 如果传输介质或目标termian1是用窄带约束构成的，则必须将宽带语音信号转换成窄带语音信号。 典型的宽带到窄带转换方法是使用低通滤波器和下采样器消除3400Hz以上的频率。 由于所产生的窄带信号具有平坦的频率响应，所以该方法产生了低沉的语音。 本文介绍了用于增强宽带到窄带转换信号的声音质量的方法和设备。 带宽切换滤波器（68）用于强调宽带信号的中频部分，使得所得的窄带信号具有非衰落频谱。

公开(公告)号：WO02065459A3

公开(公告)日：2002-11-07

申请号：PCT/US0203728

申请日：2002-02-06

Applicant: QUALCOMM INC

Inventor： CHOY EDDIE-LUN TIK ,  ANANTHAPADMANABHAN ARASANIPALA ,  DEJACO ANDREW P

IPC: G01L19/14 ,  G10L19/02 ,  G10L19/14

CPC classification number: G10L19/167

Abstract: A method and apparatus for enhancing coding efficiency by reducing illegal or other undesirable packet generation while encoding a signal. The probiability of generating illegal or other undesirable packets while encoding a signal is reduced by first analyzing a history of the frequency of codebook values selected while quantizing speech parameters. Codebook entries are then reordered so that the index/indices that create illegal or ther undesirable packets contain the least frequently used entry/entries. Reordering multiple codebooks for various parameters further reduces the probability, that an illegal or ther undesirable packet will be created during signal encoding. The method and apparatus may be applied to reduce the probability of generating illegal null traffic channel data packets while encoding eight rate speech.

Abstract translation: 一种用于通过在编码信号时减少非法或其他不期望的分组生成来增强编码效率的方法和装置。 通过首先分析在量化语音参数时选择的码本值的频率的历史来减少在编码信号时产生非法或其他不期望的分组的可能性。 然后对代码簿条目重新排序，以便创建非法或不合需要的数据包的索引/索引包含最少频繁使用的条目/条目。 对各种参数重新排序多个码本进一步降低了在信号编码期间将产生非法或不希望的数据包的概率。 可以应用该方法和装置来减少在编码八个速率语音时产生非法空闲业务信道数据分组的概率。

公开(公告)号：WO02065458A3

公开(公告)日：2002-11-14

申请号：PCT/US0203013

申请日：2002-01-30

Applicant: QUALCOMM INC

Inventor： EL-MALEH KHALED H ,  ANANTHAPADMANABHAN ARASANIPALA ,  DEJACO ANDREW P

IPC: G10L19/012 ,  G10L13/00 ,  H04B14/04 ,  H04J3/00 ,  H04J13/00 ,  G10L19/14 ,  G10L19/00 ,  H04Q7/30

CPC classification number: G10L19/173

Abstract: The disclosed embodiments provide a method and apparatus for interoperability between CTX and DTX communications systems during transmissions of silence or background noise. Continuous eight rate encoded noise frames are translated to discontinuous SID frames for transmission to DTX systems (402-410). Discontinuous SID frames are translated to continuous eight rate encoded noise frames for decoding by a CTX system (602-606). Applications of CTX to DTX interoperability comprise CDMA and GSM interoperability (narrowband voice transmission systems), CDMA next generation vocoder (The Selectable Mode Vocoder) interoperability with the new ITU-T 4 kbps vocoder operating in DTX-mode for Voice Over IP applications, future voice transmission systems that have a common speech encoder/decoder but operate in differing CTX or DTX modes during speech non-activity, and CDMA wideband voice transmission system interoperability with other wideband voice transmission systems with common wideband vocoders but with different modes of operation (DTX or CTX) during voice non-activity).

Abstract translation: 所公开的实施例提供了在静默或背景噪声传输期间用于CTX和DTX通信系统之间的互操作性的方法和设备。 连续八个速率编码的噪声帧被转换为不连续的SID帧，以传输到DTX系统（402-410）。 不连续的SID帧被转换为连续的八个速率编码的噪声帧，供CTX系统解码（602-606）。 CTX对DTX互操作性的应用包括CDMA和GSM互操作性（窄带语音传输系统），CDMA下一代声码器（可选模式声码器）与在DTX模式下运行的新型ITU-T 4 kbps声码器互操作， 具有通用语音编码器/解码器但在不活动时在不同CTX或DTX模式下操作的语音传输系统，以及与其他具有普通宽带声码器但具有不同操作模式的宽带语音传输系统（DTX 或CTX）在语音非活动期间）。

公开(公告)号：WO0247316A2

公开(公告)日：2002-06-13

申请号：PCT/US0144574

申请日：2001-11-29

Applicant: QUALCOMM INC

Inventor： EL-MALEH KHALED H ,  CHOY EDDIE-LUN TIK ,  ANANTHAPADMANABHAN ARASANIPALA ,  DEJACO ANDREW P ,  HUANG PENGJUN

IPC: H04B7/26 ,  H04L1/00 ,  H04L1/08 ,  H04L29/08

CPC classification number: H04L1/08 ,  H04L1/0046 ,  H04L1/201

Abstract: A system and method for detection of rate determination algorithm errors in variable rate communications system receivers. The disclosed embodiments prevent rate determination algorithm errors from causing audible artifacts such as screeches or beeps. The disclosed system and method detects frames with incorrectly determined data rates and performs frame erasure processing and/or memory state clean up to prevent propagation of distortion across multiple frames. Frames with incorrectly determined data rates are detected by checking illegal rate transitions, reserved bits, validating unused filter type bit combinations and analyzing relationships between fixed code-book gains and linear prediction coefficient gains.

Abstract translation: 一种用于在可变速率通信系统接收机中检测速率确定算法错误的系统和方法。 所公开的实施例防止速率确定算法错误引起可听见的伪影，例如吱吱声或哔哔声。 所公开的系统和方法检测具有错误确定的数据速率的帧，并执行帧擦除处理和/或存储器状态清理，以防止跨多个帧的失真传播。 通过检查非法速率转换，保留位，验证未使用的滤波器类型位组合以及分析固定码本增益和线性预测系数增益之间的关系来检测具有不正确确定的数据速率的帧。