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公开(公告)号：US06208274B1
公开(公告)日：2001-03-27
申请号：US09113964
申请日：1998-07-10
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
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公开(公告)号：US6078879A
公开(公告)日：2000-06-20
申请号：US114749
申请日：1998-07-13
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。
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3.发明授权
公开(公告)号：US6128591A
公开(公告)日：2000-10-03
申请号：US114746
申请日：1998-07-13
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。
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公开(公告)号：US06363341B1
公开(公告)日：2002-03-26
申请号：US09310087
申请日：1999-05-11
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。
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公开(公告)号：US5878081A
公开(公告)日：1999-03-02
申请号：US949648
申请日：1997-10-14
申请人： Robert J. Sluijter , Eric Kathmann , Rakesh Taori
发明人： Robert J. Sluijter , Eric Kathmann , Rakesh Taori
IPC分类号： G10L19/097 , G11B20/10 , H03M7/30 , H04B1/00 , H04B14/04
CPC分类号： G10L19/097 , G11B20/10527
摘要： In a transmission system for a quasi-periodic signal, an encoder (12) transmits to a decoder (28) no more than a single period from a total number of periods of the quasi-periodic signal in encoded form. In this decoder (28) the lacking periods of the quasi-periodic signal are reconstructed by means of interpolation. For obtaining an enhanced quality of the reconstructed signal, a signal segment is transmitted that is representative of two successive periods of the quasi-periodic signal. This signal segment may contain two successive periods, but may also be a signal segment having the length of a single period and being determined by a weighted sum of two successive periods.
摘要翻译： 在用于准周期性信号的传输系统中，编码器（12）从编码形式的准周期信号的周期的总数不超过一个周期向解码器（28）发送。 在该解码器（28）中，通过插值重构准周期信号的缺少周期。 为了获得重构信号的增强质量，传输代表准周期信号的两个连续周期的信号段。 该信号段可以包含两个连续的周期，但也可以是具有单个周期的长度并由两个连续周期的加权和确定的信号段。
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公开(公告)号：US06985855B2
公开(公告)日：2006-01-10
申请号：US10084714
申请日：2002-02-25
申请人： Robert J. Sluijter , Rakesh Taori
发明人： Robert J. Sluijter , Rakesh Taori
IPC分类号： G10L19/00
摘要： A transmission system includes a speech decoder, the speech decoder having a detector which determines a level of background noise in a speech signal and a post filter in electrical communication with an output of the decoder when the level of the background noise is equal to or less than a threshold value. A synthesis filter is connected to the output when the level of the background noise is greater than the threshold value.
摘要翻译： 传输系统包括语音解码器，语音解码器具有检测器，该检测器确定语音信号中的背景噪声的电平，以及当背景噪声的电平等于或等于 超过阈值。 当背景噪声的电平大于阈值时，合成滤波器连接到输出。
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公开(公告)号：US06363340B1
公开(公告)日：2002-03-26
申请号：US09316984
申请日：1999-05-24
申请人： Robert J. Sluijter , Rakesh Taori
发明人： Robert J. Sluijter , Rakesh Taori
IPC分类号： G10L1904
摘要： A speech transmission system with an input speech signal applied to a speech encoder for encoding the speech signal which is transmitted via a communication channel to a speech decoder. Background noise dependent processing elements in the speech encoder and/ or speech decoder are introduced to improve the performance of the transmission system. The parameters of the perceptual weighting filter in the speech encoder are derived by calculating linear prediction coefficients from a speech signal which is processed by means of a high pass filter. An adaptive post filter in a speech decoder is bypassed when the noise level exceeds a threshold value.
摘要翻译： 一种具有输入语音信号的语音传输系统，该语音信号被应用于语音编码器，用于对经由通信信道发送到语音解码器的语音信号进行编码。 引入了语音编码器和/或语音解码器中背景噪声相关的处理元件以改善传输系统的性能。 通过从通过高通滤波器处理的语音信号中计算线性预测系数，导出语音编码器中的感知加权滤波器的参数。 当噪声电平超过阈值时，语音解码器中的自适应后置滤波器被旁路。
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8.发明授权
公开(公告)号：US5963895A
公开(公告)日：1999-10-05
申请号：US645544
申请日：1996-05-10
申请人： Rakesh Taori , Robert J. Sluijter , Eric Kathmann
发明人： Rakesh Taori , Robert J. Sluijter , Eric Kathmann
摘要： A transmission system contains a speech coder which utilizes a pitch detector that is arranged to select a characteristic auxiliary signal portion from the signal to be coded in order to improve the quality of the pitch detection. The pitch is found by searching in the speech signal for signal portions that correspond to the characteristics auxiliary signal portion and by calculating the time difference between the respective signal portions.
摘要翻译： 一种传输系统包含语音编码器，该语音编码器利用音调检测器，该音调检测器被布置为从要编码的信号中选择特征辅助信号部分，以便提高音调检测的质量。 通过在语音信号中搜索对应于特征辅助信号部分的信号部分并通过计算各个信号部分之间的时间差来发现音调。
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9.发明授权Data processing system buffering sequential data for cyclically recurrent delay times, memory address generator for use in such system 失效数据处理系统缓冲周期性延迟时间的顺序数据，用于这种系统的存储器地址发生器
公开(公告)号：US5109488A
公开(公告)日：1992-04-28
申请号：US316720
申请日：1989-02-28
CPC分类号： G06F7/785
摘要： A data processing system buffers sequential data for the duration of cyclically recurrent delay times. Memory location allocation is performed in such a way, that the memory is used efficiently without data-shifting after a read-out, and that the address generator is fairly simple.
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公开(公告)号：US5103311A
公开(公告)日：1992-04-07
申请号：US593366
申请日：1990-10-01
CPC分类号： G06T1/20 , G06F9/3885
摘要： The invention describes a processor system suitable for processing video signal samples on a real-time basis. Signals are derived from the samples for driving an imaging unit. For this purpose, one or more processor modules are provided with processor elements, operating in parallel in time, which are connected to a crossbar switch. A module contains at least one arithmetic/logic processor element and at least one memory processor element. Moreover, there is a clock device, the frequency of which bears a fixed relationship to the frequency with which the video signal samples are obtained.
摘要翻译： 本发明描述了适用于实时地处理视频信号样本的处理器系统。 来自用于驱动成像单元的样本的信号。 为此，一个或多个处理器模块设置有与时间并行操作的处理器元件，其连接到交叉开关。 模块包含至少一个算术/逻辑处理器元件和至少一个存储器处理器元件。 此外，还有一个时钟装置，其频率与获得视频信号样本的频率具有固定的关系。
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