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1.发明授权Method and device for eradicating instability due to periodic signals in analysis-by-synthesis speech codecs 失效用于根据综合语音编解码器中的周期信号消除不稳定的方法和装置
公开(公告)号：US5893060A
公开(公告)日：1999-04-06
申请号：US834899
申请日：1997-04-07
IPC分类号： G10L19/005 , G10L19/12 , H04W4/18 , G10L7/02
CPC分类号： G10L19/09 , G10L19/005 , G10L19/06
摘要： A method and device eradicate the occasional instability inherent in analysis-by-synthesis speech/audio codecs and caused in particular by channel errors during transmission of highly periodic signals such as high-frequency sine waves. Analysis-by-synthesis techniques involve production, in response to the speech/audio signal and at regular time intervals called frames, of (a) a set of spectral parameters for use in driving a synthesis filter in view of synthesizing the speech/audio signal, and (b) a pitch gain for constructing a past-excitation-signal component supplied to the synthesis filter. In accordance with the instability eradication method, the first step consists of detecting a set of conditions including (i) a resonance condition assessed from the spectral parameters, (ii) a duration condition detected when the resonance condition has prevailed for at least the M most recent frames, M being an integer greater than 1, and (iii) a gain condition which evidences consistently-high values of the pitch gain in the N most recent frames, N being an integer greater than 1. To eradicate the occasional instability, the pitch gain is reduced to a value lower than a given threshold whenever these three conditions are detected.
摘要翻译： 一种方法和装置，可以消除综合语音/音频编解码器中固有的偶尔的不稳定性，特别是在传输高周期信号（如高频正弦波）期间的信道误差引起的。 分析合成技术涉及响应于语音/音频信号和在称为帧的规则时间间隔的生产（a）鉴于合成语音/音频信号而用于驱动合成滤波器的一组频谱参数 ，和（b）用于构成提供给合成滤波器的过去激励信号分量的音调增益。 根据不稳定性根除方法，第一步包括检测一组条件，包括（i）从光谱参数评估的共振条件，（ii）当共振条件至少满足最多M个时检测到的持续时间条件 最近的帧，M是大于1的整数，以及（iii）增益条件，其表示N个最近帧中的音调增益的一致高值，N是大于1的整数。为了消除偶尔的不稳定性， 每当检测到这三个条件时，音调增益减小到低于给定阈值的值。
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公开(公告)号：US5987406A
公开(公告)日：1999-11-16
申请号：US232274
申请日：1999-01-15
CPC分类号： G10L19/005 , G10L19/06
摘要： Instability inherent in analysis-by-synthesis speech/audio codecs and caused in particular by channel errors during transmission of highly periodic signals such as high-frequency sine waves is removed. Analysis-by-synthesis techniques involve production, in response to the speech/audio signal and at regular time intervals called frames, of (a) a set of spectral parameters for use in driving a synthesis filter in view of synthesizing the speech/audio signal, and (b) a pitch gain for constructing a past-excitation-signal component supplied to the synthesis filter. In accordance with the instability eradication method, the first step consists of detecting a set of conditions including (i) a resonance condition assessed from the spectral parameters, (ii) a duration condition detected when the resonance condition has prevailed for at least the M most recent frames, M being an integer greater than 1, and (iii) a gain condition which evidences consistently-high values of the pitch gain in the N most recent frames, N being an integer greater than 1. To eradicate the occasional instability, the pitch gain is reduced to a value lower than a given threshold whenever these three conditions are detected.
摘要翻译： 消除了在综合语音/音频编解码器分析中固有的不稳定性，特别是在高周期性信号（如高频正弦波）传输期间由信道错误引起的不稳定性。 分析合成技术涉及响应于语音/音频信号和在称为帧的规则时间间隔的生产（a）鉴于合成语音/音频信号而用于驱动合成滤波器的一组频谱参数 ，和（b）用于构成提供给合成滤波器的过去激励信号分量的音调增益。 根据不稳定性根除方法，第一步包括检测一组条件，包括（i）从光谱参数评估的共振条件，（ii）当共振条件至少满足最多M个时检测到的持续时间条件 最近的帧，M是大于1的整数，以及（iii）增益条件，其表示N个最近帧中的音调增益的一致高值，N是大于1的整数。为了消除偶尔的不稳定性， 每当检测到这三个条件时，音调增益减小到低于给定阈值的值。
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公开(公告)号：US6029128A
公开(公告)日：2000-02-22
申请号：US662991
申请日：1996-06-13
申请人： Kari Jarvinen , Tero Honkanen
发明人： Kari Jarvinen , Tero Honkanen
摘要： A post-processor 317 and method substantially for enhancing synthesised speech is disclosed. The post-processor 317 operates on a signal ex(n) derived from an excitation generator 211 typically comprising a fixed code book 203 and an adaptive code book 204, the signal ex(n) being formed from the addition of scaled outputs from the fixed code book 203 and adaptive code book 204. The post-processor operates on ex(n) by adding to it a scaled signal pv(n) derived from the adaptive code book 204. A gain or scale factor p is determined by the speech coefficients input to the excitation generator 211. The combined signal ex(n)+pv(n) is normalised by unit 316 and input to an LPC or speech synthesis filter 208, prior to being input to an audio processing unit 209.
摘要翻译： 公开了一种基本上用于增强合成语音的后处理器317和方法。 后处理器317对从通常包括固定码本203和自适应码本204的激励发生器211导出的信号ex（n）进行操作，信号ex（n）是从固定的 码本203和自适应码本204.后处理器通过向自适应码本204导出的缩放信号pv（n）加上ex（n）来操作。增益或比例因子p由语音系数 输入到激励发生器211.组合信号ex（n）+ pv（n）在输入到音频处理单元209之前由单元316归一化并输入到LPC或语音合成滤波器208。
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4.发明授权Speech synthesizer employing post-processing for enhancing the quality of the synthesized speech 有权语音合成器采用后处理来提高合成语音的质量
公开(公告)号：US5946651A
公开(公告)日：1999-08-31
申请号：US135936
申请日：1998-08-18
申请人： Kari Jarvinen , Tero Honkanen
发明人： Kari Jarvinen , Tero Honkanen
摘要： A post-processor 317 and method substantially for enhancing synthesised speech is disclosed. The post-processor 317 operates on a signal ex(n) derived from an excitation generator 211 typically comprising a fixed code book 203 and an adaptive code book 204, the signal ex(n) being formed from the addition of scaled outputs from the fixed code book 203 and adaptive code book 204. The post-processor operates on ex(n) by adding to it a scaled signal pv(n) derived from the adaptive code book 204. A gain or scale factor p is determined by the speech coefficients input to the excitation generator 211. The combined signal ex(n)+pv(n) is normalised by unit 316 and input to an LPC or speech synthesis filter 208, prior to being input to an audio processing unit 209.
摘要翻译： 公开了一种基本上用于增强合成语音的后处理器317和方法。 后处理器317对从通常包括固定码本203和自适应码本204的激励发生器211导出的信号ex（n）进行操作，信号ex（n）是从固定的 码本203和自适应码本204.后处理器通过向自适应码本204导出的缩放信号pv（n）加上ex（n）来操作。增益或比例因子p由语音系数 输入到激励发生器211.组合信号ex（n）+ pv（n）在输入到音频处理单元209之前由单元316归一化并输入到LPC或语音合成滤波器208。
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公开(公告)号：US06170073A
公开(公告)日：2001-01-02
申请号：US08821537
申请日：1997-03-21
申请人： Kari Jarvinen , Janne Vainio , Petri Haavisto , Tero Honkanen
发明人： Kari Jarvinen , Janne Vainio , Petri Haavisto , Tero Honkanen
IPC分类号： H03M1300
CPC分类号： H04L1/0061 , H03M13/47 , H04L1/0045 , H04L1/007
摘要： An encoder encodes digital signals representative of data by classifying the digital signals into first and second classes indicative of their influence on data quality and subjects them to error detection encoding capable of generating at least two error detection codes which respectively correspond to the first and second classes. A decoder receives the encoded digital signals classified into first and second digital signal classes, decodes the error detection codes, and generates error signals, corresponding to the respective digital signal classes, from which the quality of the received digital signals is estimated and the utility of the received digital signals is determined.
摘要翻译： 编码器通过将数字信号分类为表示其对数据质量的影响的第一和第二类别来对代表数据的数字信号进行编码，并使它们能够产生能够产生分别对应于第一和第二类的至少两个错误检测码的错误检测编码 。 解码器接收分类为第一和第二数字信号类别的编码数字信号，对错误检测码进行解码，并产生对应于相应数字信号类别的误差信号，接收数字信号的质量由此从其估计， 确定接收到的数字信号。
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