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1. 发明授权

US06208274B1 Transmission system using a variable length encoder 失效
标题翻译：传输系统采用可变长度编码器
公开(公告)号：US06208274B1
公开(公告)日：2001-03-27
申请号：US09113964
申请日：1998-07-10
申请人： Rakesh Taori , Robert J. Sluijter , Andreas J. Gerrits
发明人： Rakesh Taori , Robert J. Sluijter , Andreas J. Gerrits
IPC分类号： H03M740
CPC分类号： H03M7/42
摘要： In a transmission system a variable length encoder is used to reduce the average bitrate of a sequence of symbols. In order to limit the maximum length of the code it is proposed to transmit the sequence of symbols only in coded form if the length of the coded sequence is lower than a predetermined value
摘要翻译：在传输系统中，可变长度编码器用于减小符号序列的平均比特率。为了限制代码的最大长度，如果编码序列的长度低于预定值，则建议仅以编码形式发送符号序列

2. 发明授权

US6078879A Transmitter with an improved harmonic speech encoder 失效
标题翻译：具有改进的谐波语音编码器的发射机
公开(公告)号：US6078879A
公开(公告)日：2000-06-20
申请号：US114749
申请日：1998-07-13
申请人： Rakesh Taori , Robert J. Sluijter , Andreas J. Gerrits
发明人： Rakesh Taori , Robert J. Sluijter , Andreas J. Gerrits
IPC分类号： G10L25/12 , G10L19/04 , G10L19/10 , G10L21/02 , G10L25/90 , G10L19/00 , G10L19/08
CPC分类号： G10L25/90 , G10L19/10
摘要： In a harmonic speech encoder (16) a speech signal to be encoded is represented by a plurality of LPC parameters which are determined by a LPC parameter computer (30), a pitch value and a gain value. The speech encoder comprises a (coarse) pitch estimator (38) for determining a coarse pitch, and a refined pitch computer (32) to determine a refined pitch from the coarse pitch value. The refined pitch value is determined in an analysis by synthesis way, in which a refined pitch value is selected which results in a minimum error measure between a representation of a synthesized speech signal and a representation of the original speech signal.
摘要翻译：在谐音语音编码器（16）中，要由LPC参数计算机（30）确定的多个LPC参数，音调值和增益值来表示要编码的语音信号。语音编码器包括用于确定粗音调的（粗）音调估计器（38）和精调音调计算机（32），用于根据粗音调值确定精细音调。在通过合成方式的分析中确定精细音调值，其中选择精细音调值，其导致合成语音信号的表示和原始语音信号的表示之间的最小误差测量。

3. 发明授权

US6157907A Interpolation in a speech decoder of a transmission system on the basis of transformed received prediction parameters 失效
标题翻译：基于变换的接收预测参数在传输系统的语音解码器中插值
公开(公告)号：US6157907A
公开(公告)日：2000-12-05
申请号：US18980
申请日：1998-02-05
申请人： Rakesh Taori , Andreas J. Gerrits
发明人： Rakesh Taori , Andreas J. Gerrits
IPC分类号： G10L13/00 , G10L19/07 , G10L19/12 , H04B14/04 , G10L19/06
CPC分类号： G10L19/12 , G10L19/07
摘要： A transmission system wherein a speech signal is represented by a plurality of prediction parameters updated once per frame. Each frame comprises a plurality of sub-frames in which an excitation signal generated by a fixed codebook and an adaptive codebook is updated. In order to enhance the reconstructed speech quality the prediction coefficients are interpolated at the decoder by an LPC coefficient interpolator to obtain interpolated prediction coefficients for each sub-frame. According to the present invention the interpolation of the prediction coefficients is not based on the prediction coefficients used for transmission, such as reflection coefficients or Log Area Ratios, but on Line Spectral Frequencies. This reduces degradation of speech quality due to interpolation.
摘要翻译：一种传输系统，其中语音信号由每帧更新一次的多个预测参数表示。每个帧包括由固定码本和自适应码本生成的激励信号被更新的多个子帧。为了增强重构的语音质量，LPC系数内插器在解码器中内插预测系数，以获得每个子帧的内插预测系数。根据本发明，预测系数的内插不是基于用于传输的预测系数，例如反射系数或对数面积比，而是基于线谱频率。这样可以减少内插引起的语音质量下降。

4. 发明授权

US6128591A Speech encoding system with increased frequency of determination of analysis coefficients in vicinity of transitions between voiced and unvoiced speech segments 失效
标题翻译：语音编码系统具有增加的有声和语音段之间的转换附近分析系数的确定频率
公开(公告)号：US6128591A
公开(公告)日：2000-10-03
申请号：US114746
申请日：1998-07-13
申请人： Rakesh Taori , Robert J. Sluijter , Andreas J. Gerrits
发明人： Rakesh Taori , Robert J. Sluijter , Andreas J. Gerrits
IPC分类号： G10L19/18 , G10L11/06
CPC分类号： G10L19/18
摘要： In a speech encoder (4), a speech signal is encoded using a voiced speech encoder (16) and an unvoiced speech encoder (14). Both speech encoders (14,16) use analysis coefficients to represent the speech signal. The analysis coefficients are determined more frequently when a transition from voiced to unvoiced speech or vice versa is detected. This has been found to achieve significantly improved quality of speech reproduced from the encoded speech signal.
摘要翻译：在语音编码器（4）中，使用有声语音编码器（16）和无声语音编码器（14）对语音信号进行编码。两个语音编码器（14,16）使用分析系数来表示语音信号。当检测到从有声到无声语音或反之亦然的转变时，更频繁地确定分析系数。已经发现已经从编码的语音信号中获得显着提高的语音质量。

5. 发明授权

US06363341B1 Encoder for minimizing resulting effect of transmission errors 失效
标题翻译：用于最小化传输错误的影响的编码器
公开(公告)号：US06363341B1
公开(公告)日：2002-03-26
申请号：US09310087
申请日：1999-05-11
申请人： Ludovicus M. G. M. Tolhuizen , Robert J. Sluijter , Andreas J. Gerrits
发明人： Ludovicus M. G. M. Tolhuizen , Robert J. Sluijter , Andreas J. Gerrits
IPC分类号： G10L1900
CPC分类号： G10L19/005 , G10L2019/0001 , G10L2019/0013
摘要： A transmission system comprising a transmitter with a signal encoder, the signal encoder having an input for a signal to be encoded and a codebook entry selector for selecting a codebook entry for obtaining a synthetic signal giving a best approximation of a signal representative of the input signal, wherein the codebook entry includes a plurality of samples that can assume more than two values and is identified with a sequence of symbols, a receiver having a decoder with a codebook for deriving the codebook entry from the sequence of symbols received from the transmitter, wherein the codebook entries corresponding to sequences of symbols that differ in one particular symbol value also differ in one single sample value.
摘要翻译：一种传输系统，包括具有信号编码器的发射机，所述信号编码器具有用于要被编码的信号的输入，以及码本条目选择器，用于选择用于获得代表输入信号的信号的最佳近似的合成信号的码本条目其中所述码本条目包括可以采用多于两个值并且用符号序列标识的多个样本，具有解码器的接收机，具有用于从从所述发射机接收的符号序列中导出码本条目的码本，其中对应于一个特定符号值不同的符号序列的码本条目也在一个单个样本值中不同。

6. 发明授权

US6012026A Variable bitrate speech transmission system 失效
标题翻译：可变比特率语音传输系统
公开(公告)号：US6012026A
公开(公告)日：2000-01-04
申请号：US52293
申请日：1998-03-31
申请人： Rakesh Taori , Andreas J. Gerrits
发明人： Rakesh Taori , Andreas J. Gerrits
IPC分类号： G10L19/02 , G10L11/00 , G10L19/04 , G10L19/12 , G10L19/14 , G10L19/18 , H03M7/30 , H04B14/04 , G10L9/14
CPC分类号： G10L19/18 , G10L19/04
摘要： A transmission system with a transmitter and a receiver. The transmitter has a speech encoder with analysis means, has calculation means, and has control means. The receiver has a speech decoder. Through a transmission medium, the transmitter transmits frames of data to the receiver. The analysis means determine analysis coefficients from a speech signal. From a bitrate setting, the calculation means calculate a fraction of the frames of data to carry more information about the analysis coefficients than a remaining number of the frames of data. The control means control the transmitter to transmit the fraction of the frames of data and to transmit the remaining number of the frames of data. The receiver receives the frames of data. The receiver derives a reconstructed speech signal from the received frames of data.
摘要翻译：具有发射机和接收机的传输系统。发射机具有分析装置的语音编码器，具有计算装置，并具有控制装置。接收机具有语音解码器。通过传输介质，发射机向接收机发送数据帧。分析意味着从语音信号确定分析系数。从比特率设置，计算装置计算数据帧的一部分以携带关于分析系数的更多信息，而不是数据帧的剩余数量。控制装置控制发射机发送数据帧的分数，并发送数据帧的剩余数量。接收器接收数据帧。接收器从接收的数据帧导出重构的语音信号。

7. 发明授权

US06292774B1 Introduction into incomplete data frames of additional coefficients representing later in time frames of speech signal samples 失效
标题翻译：引入表示语音信号样本的时间帧之后的附加系数的不完整数据帧
公开(公告)号：US06292774B1
公开(公告)日：2001-09-18
申请号：US09052292
申请日：1998-03-31
申请人： Rakesh Taori , Andreas J. Gerrits
发明人： Rakesh Taori , Andreas J. Gerrits
IPC分类号： G10L900
CPC分类号： G10L19/06 , G10L19/002 , G10L2019/0012
摘要： A transmission system has a speech encoder and a speech decoder. From frames of speech signal samples, the speech encoder derives data frames with coefficients representing the frames of speech signal samples. The data frames, that include complete and incomplete data frames, are transmitted to a speech decoder. As compared to a complete data frame, an incomplete data frame carries an incomplete set of coefficients. The speech decoder introduces additional coefficients into incomplete data frames. The additional coefficients represent frames of speech signal samples that are later in time than the frames of speech signal samples corresponding to the incomplete data frames. The speech decoder uses the additional coefficients to complete incomplete sets of coefficients.
摘要翻译：传输系统具有语音编码器和语音解码器。从语音信号样本帧中，语音编码器用表示语音信号样本帧的系数来导出数据帧。包括完整和不完整的数据帧的数据帧被传送到语音解码器。与完整的数据帧相比，不完整的数据帧带有不完整的系数集合。语音解码器将附加系数引入不完整的数据帧。附加系数表示在时间上比对应于不完整数据帧的语音信号样本的帧的语音信号样本的帧。语音解码器使用附加系数来完成不完整的系数集合。

8. 发明授权

US6038530A Communication network for transmitting speech signals 失效
标题翻译：用于传输语音信号的通信网络
公开(公告)号：US6038530A
公开(公告)日：2000-03-14
申请号：US20606
申请日：1998-02-09
申请人： Rakesh Taori , Andreas J. Gerrits
发明人： Rakesh Taori , Andreas J. Gerrits
IPC分类号： G10L19/07 , G10L25/12 , H03M7/30 , H04B14/04 , G10L9/14
CPC分类号： G10L19/07 , G10L25/12
摘要： In a speech communication network in which a transmitter (1) transmits speech signals via a network (4) to a receiver (8), it can happen that more traffic is offered to the network (4) than it can handle. In order to reduce the network load, at least one node (24) is arranged to perform bitrate reduction to delete some of the prediction parameters representing the speech signal. It can also be the case that a receiver comprises a speech decoder having insufficient computational power available for decoding the encoded speech signal. In such case, the speech decoder is arranged for using only a part of the prediction parameters available. This results in a lower complexity of the synthesis filter (60).
摘要翻译：在其中发射机（1）经由网络（4）向接收机（8）发送语音信号的语音通信网络中，可能发生的是，向网络（4）提供比它能够处理的更多的业务量。为了减少网络负载，布置至少一个节点（24）以执行比特率降低以删除表示语音信号的一些预测参数。也可以是接收机包括语音解码器，其具有可用于解码编码语音信号的计算能力不足。在这种情况下，语音解码器被布置为仅使用可用的一部分预测参数。这导致合成滤波器（60）的较低复杂度。

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