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1. 发明授权

US5884268A Method and apparatus for reducing artifacts that result from time compressing and decompressing speech 失效
标题翻译：用于减少由时间压缩和解压缩语音产生的伪像的方法和装置
公开(公告)号：US5884268A
公开(公告)日：1999-03-16
申请号：US883977
申请日：1997-06-27
申请人： William Michael Campbell , Clifford Allan Wood , James Earl Womack , Wade Alan Bastien , Deborah Ann Calie , Robert Andrew Rapp , Terence Edward Sumner
发明人： William Michael Campbell , Clifford Allan Wood , James Earl Womack , Wade Alan Bastien , Deborah Ann Calie , Robert Andrew Rapp , Terence Edward Sumner
IPC分类号： G10L19/00 , G10L19/02 , G10L3/02
CPC分类号： G10L19/012 , G10L19/0204
摘要： A processing system time compresses a voice message before transmission, and processing system time expands the message after reception. To process the message the processing systems perform at least one of: (a) randomizing the order of a sequence of samples form a silent portion of the message after reception thereof before blending the sequence with a last portion of the expanded message; (b) selecting the sequence of samples from the silent portion of the message after reception thereof, the sequence selected being poorly correlated with the last portion of the expanded message, before blending the sequence with the last portion of the message; and (c) compressing the dynamic range of the message before transmission, by an amount dependent upon the signal-to-noise ratio of the message, and aggressively expanding the dynamic range of the message after reception, by a fixed amount.
摘要翻译：处理系统在传输之前对语音消息进行时间压缩，处理系统时间在接收后扩展消息。为了处理消息，处理系统执行以下中的至少一个：（a）在将序列与扩展消息的最后部分混合之前，使其在接收之后随机化该消息序列的无声部分; （b）在接收到消息的静默部分之后从所述消息的无声部分中选择样本序列，在将所述序列与所述消息的最后部分混合之前，所选择的序列与所述扩展消息的最后部分不太相关; 以及（c）在发送之前将消息的动态范围压缩到取决于消息的信噪比的量，并且在接收之后大幅度地扩展消息的动态范围一定的量。

2. 发明授权

US5940439A Method and apparatus for adaptive rate communication system 失效
标题翻译：自适应速率通信系统的方法和装置
公开(公告)号：US5940439A
公开(公告)日：1999-08-17
申请号：US806783
申请日：1997-02-26
申请人： John Eric Kleider , Clifford Allan Wood , William Michael Campbell
发明人： John Eric Kleider , Clifford Allan Wood , William Michael Campbell
IPC分类号： H04L1/00 , H04B17/00 , H04B3/46 , H04Q1/20
CPC分类号： H04L1/0071 , H04L1/0003 , H04L1/0009 , H04L1/0014 , H04L1/0026 , H04L1/0038
摘要： A system is disclosed for an adaptive rate voice system to provide improvements in coded operation over changing communication channel (50) conditions. This adaptive rate system efficiently determines optimal voice/channel coding rates , coding strategies and modulation/demodulation for optimum voice quality and intelligibility. A system state estimator (100), channel status estimator (110) and channel status monitor (120) provides feedback in the system to optimize the communication channel. The system maintains a continuous link despite changing channel conditions and minimizes delays through the system. Even though simple in design, it provides relatively low complexity and powerful channel coding operation. Operating conditions are thus extended for CDMA and portable communication systems. Voice intelligibility is preserved in extremely noisy or even hostile channel conditions.
摘要翻译：公开了一种用于自适应速率语音系统的系统，以在改变通信信道（50）条件下提供编码操作的改进。该自适应速率系统有效地确定了最佳语音/信道编码率，编码策略和调制/解调，以获得最佳语音质量和可理解性。系统状态估计器（100），信道状态估计器（110）和信道状态监视器（120）在系统中提供反馈以优化通信信道。尽管改变了通道条件，系统仍保持连续的链接，并通过系统减少了延迟。即使设计简单，它提供相对较低的复杂性和强大的信道编码操作。因此，CDMA和便携式通信系统的工作条件得到扩展。语音清晰度保持在极其嘈杂或甚至敌对的频道条件下。

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