Speech processing apparatus
First Claim
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1. An audio encoding system comprising:
- a memory for storing a predetermined function which gives, for a given set of audio signal values, a probability density for parameters of a predetermined audio model which is assumed to have generated the set of audio signal values, the probability density defining, for a given set of model parameter values, the probability that the predetermined audio model has those parameter values, given that the model is assumed to have generated the set of audio signal values;
means for receiving a set of audio signal values representative of an input audio signal;
means for applying the set of received audio signal values to said stored function to give the probability density for said model parameters for the set of received audio signal values;
means for processing said function with said set of received audio signal values applied, to derive samples of parameter values from said probability density;
means for analysing at least some of said derived samples of parameter values to determine parameter values that are representative of the set of received audio signal values; and
means for encoding said determined parameter values to generate encoded data representative of the received audio signal values.
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Abstract
An audio transmission system is provided which is operable to receive sets of signals representative of a speech signal generated by a speech source. The system is operable to determine parameters representative of each of the sets of signal values, to encode these parameter values and then to transmit these parameter values to a receiver circuit. At the receiver, the encoded parameters are decoded to recover the parameter values. The recovered parameter values may then be used to resynthesise the speech using a speech synthesiser or they may be used by a speech recognition system to generate a recognition result.
43 Citations
68 Claims
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1. An audio encoding system comprising:
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a memory for storing a predetermined function which gives, for a given set of audio signal values, a probability density for parameters of a predetermined audio model which is assumed to have generated the set of audio signal values, the probability density defining, for a given set of model parameter values, the probability that the predetermined audio model has those parameter values, given that the model is assumed to have generated the set of audio signal values;
means for receiving a set of audio signal values representative of an input audio signal;
means for applying the set of received audio signal values to said stored function to give the probability density for said model parameters for the set of received audio signal values;
means for processing said function with said set of received audio signal values applied, to derive samples of parameter values from said probability density;
means for analysing at least some of said derived samples of parameter values to determine parameter values that are representative of the set of received audio signal values; and
means for encoding said determined parameter values to generate encoded data representative of the received audio signal values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 27, 28, 29)
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26. An audio transmission system comprising a transmitter and receiver, wherein
the transmitter comprises: -
means for receiving an input audio signal;
means for determining a measure of the quality of the input audio signal;
means for encoding data representative of the audio signal in dependence upon the determined quality measure; and
means for transmitting the encoded audio data; and
whereinsaid receiver comprises;
means for receiving the encoded audio data;
means for decoding the transmitted audio data; and
means for outputting the decoded audio data.
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30. An audio transmission system comprising a transmission unit and a receiving unit, wherein
the transmission unit comprises: -
a memory for storing a predetermined function which gives, for a given set of audio signal values, a probability density for parameters of a predetermined audio model which is assumed to have generated the set of audio signal values, the probability density defining, for a given set of model parameter values, the probability that the predetermined audio model has those parameter values, given that the model is assumed to have generated the set of audio signal values;
means for receiving a set of audio signal values representative of an input audio signal;
means for applying the set of received audio signal values to said stored function to give the probability density for said model parameters for the set of received audio signal values;
means for processing said function with said set of received audio signal values applied, to derive samples of parameter values from said probability density;
means for analysing at least some of said derived samples of parameter values to determine parameter values that are representative of the set of received audio signal values; and
means for transmitting said determined parameter values; and
whereinthe receiver unit comprises;
means for receiving said transmitted parameter values; and
means for processing the received parameter values to generate an output signal in dependence thereon. - View Dependent Claims (31)
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32. A transmitter apparatus comprising:
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a memory for storing a predetermined function which gives, for a given set of audio signal values, a probability density for parameters of a predetermined audio model which is assumed to have generated the set of audio signal values, the probability density defining, for a given set of model parameter values, the probability that the predetermined audio model has those parameter values, given that the model is assumed to have generated the set of audio signal values;
means for receiving a set of audio signal values representative of an input audio signal;
means for applying the set of received audio signal values to said stored function to give the probability density for said model parameters for the set of received audio signal values;
means for processing said function with said set of received audio signal values applied, to derive samples of parameter values from said probability density;
means for analysing at least some of said derived samples of parameter values to determine parameter values that are representative of the set of received audio signal values; and
means for transmitting said determined parameter values.
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33. A transmitter apparatus comprising:
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means for receiving an input audio signal;
means for determining a measure of the quality of the input audio signal;
means for encoding data representative of the audio signal in dependence upon the determined quality measure; and
means for transmitting the encoded data. - View Dependent Claims (34, 35, 36, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 64, 67)
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37. An audio encoding method comprising the steps of:
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storing a predetermined function which gives, for a given set of audio signal values, a probability density for parameters of a predetermined audio model which is assumed to have generated the set of audio signal values, the probability density defining, for a given set of model parameter values, the probability that the predetermined audio model has those parameter values, given that the model is assumed to have generated the set of audio signal values;
receiving a set of audio signal values representative of an input audio signal at a receiver;
applying the set of received audio signal values to said stored function to give the probability density for said model parameters for the set of received audio signal values;
processing said function with said set of received audio signal values applied, to derive samples of parameter values from said probability density;
analysing at least some of said derived samples of parameter values to determine parameter values that are representative of the set of received audio signal values; and
encoding said determined parameter values to generate encoded data representative of the received audio signal values. - View Dependent Claims (68)
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62. An audio transmission method using a transmitter and receiver, the method comprising the steps of:
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at the transmitter;
receiving an audio signal;
determining a measure of the quality of the received audio signal;
encoding data representative of the audio signal in dependence upon the determined quality measure; and
transmitting the encoded data; and
at said receiver;
receiving the encoded audio data;
decoding the transmitted audio data; and
outputting the decoded audio data. - View Dependent Claims (63, 65)
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66. An audio transmission method using a transmission unit and a receiving unit, wherein the method comprises the steps of:
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at the transmission unit;
storing a predetermined function which gives, for a given set of audio signal values, a probability density for parameters of a predetermined audio model which is assumed to have generated the set of audio signal values, the probability density defining, for a given set of model parameter values, the probability that the predetermined audio model has those parameter values, given that the model is assumed to have generated the set of audio signal values;
receiving a set of audio signal values representative of an input audio signal;
applying the set of received audio signal values to said stored function to give the probability density for said model parameters for the set of received audio signal values;
processing said function with said set of received audio signal values applied, to derive samples of parameter values from said probability density;
analysing at least some of said derived samples of parameter values to determine parameter values that are representative of the set of received audio signal values; and
transmitting said determined parameter values; and
at the receiver unit;
receiving said transmitted parameter values; and
processing the received parameter values to generate an output signal in dependence thereon.
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Specification