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1.发明授权Method and apparatus for decoding variable rate data using hypothesis testing to determine data rate 有权用于使用假设检验来解码可变速率数据以确定数据速率的方法和装置公开(公告)号：US06418163B2
公开(公告)日：2002-07-09
申请号：US09514111
申请日：2000-02-28
IPC分类号： H04B346
CPC分类号： H04L1/208 , H04L1/0046 , H04L25/0262
摘要： A system and method for determining the data rate of a frame of data at a receiver of a variable rate communications system. A vocoder at a transmitter encodes a frame of data at one of the rates of a predetermined set of rates. The data rate is dependent on the speech activity during the time frame of the data. The data frame is also formatted with overhead bits, including bits for error detection and detection. At the receiver, the data rate for the frame is determined based on hypothesis testing. Because the data rate is based on speech activity, a hypothesis test may be designed based on the statistics of speech activity. The received data frame is first decoded into information bits at the most probable rate as provided by the hypothesis test. Error metrics are generated for the decoded information bits. If the error metrics indicate that the information bits are of good quality, then the information bits are presented to a vocoder at the receiver to be processed for interface with the user. If the error metrics indicate that the information bits have not been properly decoded, then the received data frame is decoded at the other rates of the set of rates until the actual data rate is determined.
摘要翻译： 一种用于在可变速率通信系统的接收机处确定数据帧的数据速率的系统和方法。 发射机的声码器以预定速率集合的速率之一编码数据帧。 数据速率取决于数据时间段内的语音活动。 数据帧也被格式化为开销位，包括用于错误检测和检测的位。 在接收端，帧的数据速率是基于假设检验确定的。 由于数据速率是基于语音活动的，所以可以基于语音活动的统计来设计假设检验。 接收到的数据帧首先按照假设检验提供的最可能速率解码成信息位。 为解码的信息位生成错误度量。 如果错误度量指示信息比特质量好，则信息比特被提供给接收者处的声码器以与用户进行接口。 如果错误度量指示信息比特未被正确地解码，则接收到的数据帧以该比特率的其他速率被解码，直到确定实际数据速率。
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2.发明授权
公开(公告)号：US6108372A
公开(公告)日：2000-08-22
申请号：US741273
申请日：1996-10-30
CPC分类号： H04L1/208 , H04L1/0046 , H04L25/0262
摘要： A system and method for determining the data rate of a frame of data at a receiver of a variable rate communications system. A vocoder at a transmitter encodes a frame of data at one of the rates of a predetermined set of rates. The data rate is dependent on the speech activity during the time frame of the data. The data frame is also formatted with overhead bits, including bits for error detection and detection. At the receiver, the data rate for the frame is determined based on hypothesis testing. Because the data rate is based on speech activity, a hypothesis test may be designed based on the statistics of speech activity. The received data frame is first decoded into information bits at the most probable rate as provided by the hypothesis test. Error metrics are generated for the decoded information bits. If the error metrics indicate that the information bits are of good quality, then the information bits are presented to a vocoder at the receiver to be processed for interface with the user. If the error metrics indicate that the information bits have not been properly decoded, then the received data frame is decoded at the other rates of the set of rates until the actual data rate is determined.
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