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公开(公告)号：EP2384507A1
公开(公告)日：2011-11-09
申请号：EP10700157.0
申请日：2010-01-05
申请人： Skype Limited
发明人： VOS, Koen, Bernard
CPC分类号： G10L19/032 , G10L19/04 , G10L25/93
摘要： A method, system and program for decoding a speech signal. The method comprises: receiving an encoded speech signal having quantization values; transforming the quantization values by adding simulated random-noise samples; from the encoded speech signal, determining a parameter of the transformation; wherein the method further comprises controlling said transformation in dependence on said parameter.
摘要翻译： 用于编码和/或解码语音信号的方法，系统和程序。 该方法包括：生成表示输入语音信号的属性的第一信号; 使用模拟随机噪声信号来变换第一信号，从而产生第二信号; 基于多个离散表示水平量化第二信号，由此产生用于在编码语音信号中传输的量化值，并且还产生作为第二信号的量化版本的第三信号; 以及对第三信号执行变换的逆处理，从而生成量化输出信号，其中第一信号的生成基于量化输出信号的反馈。 该方法还包括根据第一信号的属性来控制变换，以便改变由变换产生的噪声效应相对于表示水平的幅度。
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公开(公告)号：EP2384502A1
公开(公告)日：2011-11-09
申请号：EP10700159.6
申请日：2010-01-05
申请人： Skype Limited
发明人： VOS, Koen, Bernard
IPC分类号： G10L19/02
CPC分类号： G10L19/03 , G10L19/02 , G10L19/12 , G10L21/0208 , G10L25/90
摘要： A method, system and program for encoding and decoding speech according to a source-filter model whereby speech is modelled to comprise a source signal filtered by a time-varying filter. The method comprises: receiving a speech signal comprising successive frames. For each of a plurality of frames of the speech signal: adding a predetermined noise signal generated by a quantization gain multiplied by 0.5 times an inverse of a pitch correlation to the speech signal to generate a simulated signal, determining linear predictive coding coefficients based on the simulated signal frame, and determining a linear predictive coding residual signal based on the linear predictive coding coefficients and one of the speech signal and the simulated signal. Then forming an encoded signal representing said speech signal, based on the linear predictive coding coefficients and the linear predictive coding residual signal.
摘要翻译： 一种用于根据源滤波器模型对语音进行编码和解码的方法，系统和程序，由此语音被建模为包括由时变滤波器滤波的源信号。 该方法包括：接收包括连续帧的语音信号。 对于语音信号的多个帧中的每一帧：将预定的噪声信号加到语音信号以产生模拟信号，根据仿真的信号帧确定线性预测编码系数，以及基于该模拟信号帧确定线性预测编码残差信号 线性预测编码系数以及语音信号和模拟信号中的一个。 然后，基于线性预测编码系数和线性预测编码残差信号，形成表示所述语音信号的编码信号。
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公开(公告)号：EP2384505A1
公开(公告)日：2011-11-09
申请号：EP10700156.2
申请日：2010-01-05
申请人： Skype Limited
IPC分类号： G10L19/06
摘要： A method, system and program for encoding and decoding speech according to a source-filter model whereby speech is modelled to comprise a source signal filtered by a time-varying filter. The method comprises: receiving a speech signal comprising successive frames, for each of a plurality of frames of the speech signal, deriving a first line spectral frequency vector for a first portion of the frame, and a second line spectral frequency vector for a second portion of the frame, and determining a transmit line spectral frequency vector and an interpolation factor based on the first and second line spectral frequency vectors, and on the transmit line spectral frequency vector for a preceding one of the frames.
摘要翻译： 一种用于根据源滤波器模型对语音进行编码和解码的方法，系统和程序，由此语音被建模以包括由时变滤波器滤波的源信号。 该方法包括：对于语音信号的多个帧中的每一个，接收包括连续帧的语音信号，导出该帧的第一部分的第一线谱频率向量，以及用于第二部分的第二线谱频率向量 并且基于第一和第二线谱频率矢量以及对于前一帧的发射线谱频率矢量确定发射线谱频率矢量和内插因子。
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公开(公告)号：EP2384503A1
公开(公告)日：2011-11-09
申请号：EP10700158.8
申请日：2010-01-05
申请人： Skype Limited
发明人： VOS, Koen, Bernard
IPC分类号： G10L19/04
CPC分类号： G10L19/087 , G10L19/00 , G10L19/04 , G10L19/26
摘要： A method, system and program for encoding speech. The method comprises: receiving an input signal representing a property of speech; quantizing the input signal, thus generating a quantized output signal; prior to the quantization, supplying a version of the input signal to a first noise shaping filter having a first set of filter coefficients, thus generating a first filtered signal based on that version of the input signal and the first set of filter coefficients; following the quantization, supplying a version of the quantized output signal to a second noise shaping filter having a second set of filter coefficients different than said first set, thus generating a second filter signal based on that version of the quantized output signal and the second set of filter coefficients; performing a noise shaping operation to control a frequency spectrum of a noise effect in the quantized output signal caused by the quantization, wherein the noise shaping operation is performed based on both the first and second filtered signals; and transmitting the quantized output signal in an encoded signal.
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公开(公告)号：EP2374247A1
公开(公告)日：2011-10-12
申请号：EP09793510.0
申请日：2009-12-10
申请人： Skype Limited
CPC分类号： H04L47/10 , H04L43/0852 , H04L43/0876 , H04L43/106
摘要： The invention provides a method of controlling transmission of packets from a transmitter to a receiver via a channel, and a corresponding transmitter and receiver. The method comprises: transmitting packets from a queue, each packet having a packet size (9) based on data in the packet; determining a transmission time for each packet (Tx), based on a transmission clock; determining a reception time of each packet (Rx), based on a reception clock; supplying to an estimation function (14) successive sets of observations including in each set transmission time (Tx), reception time (Rx) and packet size (S), the estimate function being arranged to provide an estimate of bandwidth (BW
UP ) for the channel using the relationship between the bandwidth (BW
UP ), the amount of data in the queue (N), packet size (S) and the delay between transmitting successive packets from the queue; and using the estimated bandwidth to control transmission of packets.
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