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    Cross-term compensation power adjustment of embedded auxiliary data in a primary data signal
    2.
    发明授权
    Cross-term compensation power adjustment of embedded auxiliary data in a primary data signal 失效
    主要数据信号中嵌入式辅助数据的跨期补偿功率调整

    公开(公告)号：US5940429A

    公开(公告)日：1999-08-17

    申请号：US805732

    申请日：1997-02-25

    申请人： S. Katherine Lam ,  Chong U. Lee

    发明人： S. Katherine Lam ,  Chong U. Lee

    IPC分类号： G10L19/00 ,  H04B1/66 ,  H04B1/707 ,  H04K1/10

    CPC分类号： G10L19/018 ,  H04B1/665 ,  H04B1/707

    摘要： An auxiliary data signal is transported with a primary data signal by hiding the auxiliary data signal in the form of colored noise. The colored noise has a spectrum that simulates the spectrum of the primary data signal. By adjusting the gain of individual spread spectrum signal carrier(s) and the power of the colored noise, the auxiliary information stream(s) can be rendered at any desired level below or above an interference threshold in the primary data signal. The power of the colored noise is further compensated to account for a cross-correlation between the primary data signal and the auxiliary data signal to enhance the recovery of the auxiliary data at a decoder.

    摘要翻译： 通过以彩色噪声的形式隐藏辅助数据信号，用主数据信号传送辅助数据信号。 彩色噪声具有模拟主数据信号频谱的频谱。 通过调整各个扩展频谱信号载波的增益和有色噪声的功率，辅助信息流可以在低于或高于主数据信号中的干扰阈值的任何期望的水平处呈现。 彩色噪声的功率被进一步补偿以解决主数据信号和辅助数据信号之间的互相关，以增强解码器处的辅助数据的恢复。

    Variable rate vocoder
    3.
    发明授权
    Variable rate vocoder 失效
    可变速率声码器

    公开(公告)号：US5778338A

    公开(公告)日：1998-07-07

    申请号：US788728

    申请日：1997-01-23

    申请人： Paul E. Jacobs ,  William R. Gardner ,  Chong U. Lee ,  Klein S. Gilhousen ,  S. Katherine Lam ,  Ming-Chang Tsai

    发明人： Paul E. Jacobs ,  William R. Gardner ,  Chong U. Lee ,  Klein S. Gilhousen ,  S. Katherine Lam ,  Ming-Chang Tsai

    IPC分类号： G10L19/00 ,  G10L20060101 ,  G10L11/02 ,  G10L19/02 ,  G10L19/04 ,  G10L19/06 ,  G10L19/12 ,  G10L19/14 ,  G10L21/02 ,  G10L21/04 ,  H03M7/30 ,  H03M7/36 ,  H04B1/66 ,  H04J3/16 ,  H04L1/00 ,  G01L5/00

    CPC分类号： H04L1/0057 ,  G10L19/005 ,  G10L19/012 ,  G10L19/12 ,  G10L19/22 ,  G10L19/24 ,  G10L25/78 ,  H04B1/66 ,  H04J3/1688 ,  H04L1/0014 ,  H04L1/0017 ,  H04L1/0041 ,  H04L1/0046 ,  G10L2025/786

    摘要： An apparatus and method for performing speech signal compression, by variable rate coding of frames of digitized speech samples. The level of speech activity for each frame of digitized speech samples is determined and an output data packet rate is selected from a set of rates based upon the determined level of frame speech activity. A lowest rate of the set of rates corresponds to a detected minimum level of speech activity, such as background noise or pauses in speech, while a highest rate corresponds to a detected maximum level of speech activity, such as active vocalization. Each frame is then coded according to a predetermined coding format for the selected rate wherein each rate has a corresponding number of bits representative of the coded frame. A data packet is provided for each coded frame with each output data packet of a bit rate corresponding to the selected rate. At the decoder, if a frame is lost due to a channel error, the error is masked by maintaining a fraction of the previous frame's energy and smoothly transitioning to background noise.

    摘要翻译： 一种用于通过数字化语音样本的帧的可变速率编码来执行语音信号压缩的装置和方法。 确定每个数字化语音样本帧的语音活动水平，并且基于所确定的帧语音活动水平从一组速率中选择输出数据分组速率。 一组速率的最低速率对应于检测到的语音活动的最低水平，例如背景噪声或语音中的停顿，而最高速率对应于检测到的语音活动的最大水平，例如主动发声。 然后根据所选择的速率的预定编码格式对每个帧进行编码，其中每个速率具有表示编码帧的相应位数。 为每个编码帧提供数据分组，每个输出数据分组的比特率对应于所选择的速率。 在解码器中，如果帧由于信道错误而丢失，则通过保持前一帧的能量的一小部分并平滑地转换到背景噪声来掩蔽该错误。

    Detection and bypass of tandem vocoding using detection codes
    5.
    发明授权
    Detection and bypass of tandem vocoding using detection codes 失效
    使用检测码对串联声码的检测和旁路

    公开(公告)号：US5956673A

    公开(公告)日：1999-09-21

    申请号：US378300

    申请日：1995-01-25

    申请人： Lindsay A. Weaver, Jr. ,  S. Katherine Lam ,  William Gardner ,  Paul Jacobs

    发明人： Lindsay A. Weaver, Jr. ,  S. Katherine Lam ,  William Gardner ,  Paul Jacobs

    IPC分类号： G10L19/14 ,  H04W88/18 ,  G10L9/18 ,  H04Q7/24

    CPC分类号： H04W88/181 ,  G10L19/16

    摘要： A first remote vocoder receives analog voice and produces packetized vocoder data which is transmitted over a wireless link. A first local vocoder receives the packetized vocoder data from the wireless link. The first local vocoder converts the packetized data to a multibit PCM output. The first local vocoder also adds a detection code to one of the least significant bits (LSB) of the PCM output. The first local vocoder passes the PCM signal to the PSTN from the second end user. The first local vocoder also receives PCM input over the PSTN. The first local vocoder constantly monitors the least significant bit of the PCM input for a detection code indicating that a second local vocoder is connected at the receiving end. If the first local vocoder detects the detection code from the second local vocoder, it begins to substitute packetized data and a redundancy check for a second one of the LSB's of the outgoing PCM. The first local vocoder also begins to monitor the second one of the LSB's of the incoming PCM. If the redundancy check indicates that valid packetized data has been received, the first local vocoder stops converting the PCM output into packetized data and simply passes the packetized data on the second one of the LSB's to the first remote vocoder. If at any time the redundancy check fails and the detection code is not detected, the first local vocoder returns to converting the incoming PCM to packetized data. In this way, the tandem vocoding arrangement is avoided.

    摘要翻译： 第一远程声码器接收模拟语音并产生通过无线链路发送的分组声码器数据。 第一本地声码器从无线链路接收分组声码器数据。 第一个本地声码器将打包数据转换成多位PCM输出。 第一本地声码器还将检测码添加到PCM输出的最低有效位（LSB）之一。 第一本地声码器从第二终端用户传递PCM信号到PSTN。 第一本地声码器也通过PSTN接收PCM输入。 第一本地声码器持续监视PCM输入的最低有效位，用于检测码，指示在接收端连接第二本地声码器。 如果第一本地声码器检测到来自第二本地声码器的检测码，则它开始替代分组数据和对出局PCM的LSB中的第二个的冗余校验。 第一个本地声码器也开始监视传入的PCM的第二个LSB。 如果冗余检查指示已经接收到有效的分组化数据，则第一本地语音编码器停止将PCM输出转换成分组化数据，并且将LSB的第二个上的分组数据简单地传递到第一远程声码器。 如果在任何时候冗余检查失败并且未检测到检测码，则第一本地声码器返回将输入的PCM转换成分组数据。 以这种方式，避免了串联声音编码布置。

    Method and apparatus for detection of tandem vocoding to modify vocoder filtering
    6.
    发明授权
    Method and apparatus for detection of tandem vocoding to modify vocoder filtering 失效
    用于检测串联声码的方法和装置，用于修改声码器滤波

    公开(公告)号：US5903862A

    公开(公告)日：1999-05-11

    申请号：US575287

    申请日：1996-01-11

    申请人： Lindsay A. Weaver, Jr. ,  S. Katherine Lam ,  William R. Gardner ,  Paul E. Jacobs ,  Andrew P. DeJaco ,  Gilbert C. Sih

    发明人： Lindsay A. Weaver, Jr. ,  S. Katherine Lam ,  William R. Gardner ,  Paul E. Jacobs ,  Andrew P. DeJaco ,  Gilbert C. Sih

    IPC分类号： G10L11/02 ,  G10L19/00 ,  G10L19/14 ,  H04B7/26 ,  H04B14/04 ,  H04Q11/04 ,  H04W88/18 ,  G10L9/18 ,  H04Q7/24

    CPC分类号： H04W88/181 ,  G10L19/16

    摘要： When one vocoding system is coupled to another vocoding system, a tandem arrangement results. The tandem configuration results in voice quality degradation as speech is encoded and decoded, then encoded and decoded again. One reason for the degradation is that postfiltering performed at the output of the speech decoding process introduces distortions in the spectral content of the reconstructed speech as compared to the original speech. The present invention prevents the degradation due to the use of postfilters by modifying the postfiltering within the vocoders where a tandem configuration exists. A detection code is embedded within the data signal to indicate the existence of a tandem configuration. If the detection code is received at a vocoder, modified vocoding is established within the vocoders to prevent the degradation due to the postfiltering.

    摘要翻译： 当一个声码系统耦合到另一个声码系统时，会产生串联排列。 串音配置导致语音质量下降，因为语音被编码和解码，然后被再次编码和解码。 降级的一个原因是在语音解码过程的输出处执行的后置滤波与原始语音相比引入了重构语音的频谱内容中的失真。 本发明通过修改存在串列配置的声码器中的后置滤波来防止由于使用后置滤波器导致的劣化。 检测码嵌入在数据信号中以指示串联配置的存在。 如果在声码器处接收到检测码，则在声码器内建立修改后的声码，以防止由于后置滤波引起的劣化。