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公开(公告)号：EP0925651B1
公开(公告)日：2004-10-13
申请号：EP98923028.9
申请日：1998-06-18
IPC分类号： H03M7/40
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.
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公开(公告)号：EP0906664B1
公开(公告)日：2006-06-21
申请号：EP98903258.6
申请日：1998-03-05
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.
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公开(公告)号：EP0922278B1
公开(公告)日：2006-04-05
申请号：EP98904327.8
申请日：1998-03-05
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.
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公开(公告)号：EP1002312B1
公开(公告)日：2006-10-04
申请号：EP98921678.3
申请日：1998-06-05
IPC分类号： G10L11/04
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. This determining of a refined pitch value is done 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 synthetic speech signal and a representation of the original speech signal.
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公开(公告)号：EP1002312A1
公开(公告)日：2000-05-24
申请号：EP98921678.3
申请日：1998-06-05
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. This determining of a refined pitch value is done 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 synthetic speech signal and a representation of the original speech signal.
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公开(公告)号：EP0925651A2
公开(公告)日：1999-06-30
申请号：EP98923028.0
申请日：1998-06-18
IPC分类号： H03M7
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.
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公开(公告)号：EP0922278A1
公开(公告)日：1999-06-16
申请号：EP98904327.0
申请日：1998-03-05
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.
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公开(公告)号：EP0906664A1
公开(公告)日：1999-04-07
申请号：EP98903258.0
申请日：1998-03-05
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.
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公开(公告)号：EP0895672A2
公开(公告)日：1999-02-10
申请号：EP98900324.0
申请日：1998-01-22
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) comprises bitrate reduction means 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 not the computational power available for decoding the encoded speech signal. In said 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).
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