Method and apparatus for improved detection of rate errors in variable rate receivers
    2.
    发明申请
    Method and apparatus for improved detection of rate errors in variable rate receivers 有权
    用于改进可变速率接收机中速率误差检测的方法和装置

    公开(公告)号:US20050050407A1

    公开(公告)日:2005-03-03

    申请号:US10938445

    申请日:2004-09-09

    CPC分类号: H04L1/08 H04L1/0046 H04L1/201

    摘要: 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.

    摘要翻译: 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,例如吱吱声或嘟嘟声。 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,验证未使用的过滤器类型位组合以及分析固定代码簿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。

    Voice recognition system method and apparatus
    3.
    发明授权
    Voice recognition system method and apparatus 有权
    语音识别系统的方法和装置

    公开(公告)号:US06941265B2

    公开(公告)日:2005-09-06

    申请号:US10017270

    申请日:2001-12-14

    IPC分类号: G10L15/28 G10L15/00

    CPC分类号: G10L15/28

    摘要: Generally stated a method and an accompanying apparatus provides for a voice recognition system (300) with programmable front end processing unit (400). The front end processing unit (400) requests and receives different configuration files at different times for processing voice data in the voice recognition system (300). The configuration files are communicated to the front end unit via a communication link (310) for configuring the front end processing unit (400). A microprocessor may provide the front end configuration files on the communication link at different times.

    摘要翻译: 通常所述方法和伴随装置提供具有可编程前端处理单元(400)的语音识别系统(300)。 前端处理单元400在不同时间请求并接收不同的配置文件,以处理语音识别系统(300)中的语音数据。 配置文件经由用于配置前端处理单元(400)的通信链路(310)传送到前端单元。 微处理器可以在不同时间在通信链路上提供前端配置文件。

    Enhanced Conversion of Wideband Signals to Narrowband Signals
    4.
    发明申请
    Enhanced Conversion of Wideband Signals to Narrowband Signals 有权
    宽带信号增强到窄带信号的转换

    公开(公告)号:US20070162279A1

    公开(公告)日:2007-07-12

    申请号:US11534327

    申请日:2006-09-22

    IPC分类号: G10L21/00

    CPC分类号: G10L21/038 G10L19/26

    摘要: Wideband speech signals must be converted to narrowband speech signals if the transmission medium or the destination terminal 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. However, this method produces a muffled speech sound since the resulting narrowband signal has a flat frequency response. Methods and apparatus are presented herein to enhance the acoustic quality of a wideband-to-narrowband converted signal. A bandwidth switching filter is used to emphasize a mid-range frequency portion of the wideband signal so that the resulting narrowband signal has a non-flat frequency spectrum.

    摘要翻译: 如果传输介质或目标终端用窄带约束构成,则宽带语音信号必须转换为窄带语音信号。 典型的宽带至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。 然而,该方法产生消声语音,因为所得到的窄带信号具有平坦的频率响应。 这里呈现了增强宽带到窄带转换信号的声学质量的方法和装置。 带宽切换滤波器用于强调宽带信号的中等频率部分,使得所得到的窄带信号具有非平坦频谱。

    Method and apparatus for establishing TDD/TTY service over vocoded channels
    5.
    发明授权
    Method and apparatus for establishing TDD/TTY service over vocoded channels 失效
    通过声码通道建立TDD / TTY服务的方法和装置

    公开(公告)号:US06205339B1

    公开(公告)日:2001-03-20

    申请号:US09114344

    申请日:1998-07-13

    IPC分类号: H04B138

    摘要: A method and apparatus to facilitate service negotiation by a digital telecommunications system that allows a low activity communication to be transmitted by the system over vocoded channels. In one embodiment, once the telecommunication system is noticed that a low activity signal needs to be transmitted, each telecommunication system vocoder involved in the transmission automatically locks into full rate, and where applicable, adjusts the transmission power to reduce frame error rate. Further, the telecommunications system may include any number of wireless links. The invention includes a noticing apparatus coupled to a sensor that receives a low activity communication device attachment and notices the digital telecommunications system that a low activity communication is being initiated or discontinued.

    摘要翻译: 一种促进由数字电信系统进行服务协商的方法和装置,其允许系统通过声码通道传输低活动性通信。 在一个实施例中,一旦电信系统被注意到需要发送低活动信号,则传输中涉及的每个电信系统声码器自动锁定为全速率,并且在适用的情况下调整发送功率以减少帧错误率。 此外,电信系统可以包括任何数量的无线链路。 本发明包括耦合到传感器的注意装置,其接收低活动性通信装置附件并通知数字电信系统正在启动或停止低活动通信。