Adaptive linear predictive coding/decoding
First Claim
1. A method of coding a digital audio signal comprising use of a modified predictive filter, for coding at least one current block of a succession of consecutive blocks of data, and wherein the method comprises the steps of:
- inputting digital audio data comprising said digital audio signal;
calculating a backward filter for a past block, wherein the past block precedes the current block,determining coefficients of a modifying filter, as a function of said digital audio signal in the current block,combining said coefficients of said modifying filter with coefficients of said backward filter so as to generate information for calculating the modified predictive filter,constructing said modified predictive filter using the information;
generating an encoded current block by applying said modified predictive filter to said current block, andsending said encoded current block and the information for calculating the modified predictive filter over a telecommunication network.
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Accused Products
Abstract
A method of coding/decoding of a digital audio signal comprising a succession of consecutive blocks of data, on the basis of a predictive filter. A modified predictive filter is used for the coding of at least one current block, the modified filter being constructed by the combination of: a rear filter calculated for a past block, preceding the current block, and enrichment parameters for the rear filter, which are determined as a function of the signal in the current block and comprising the coefficients of a modifying filter.
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Citations
18 Claims
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1. A method of coding a digital audio signal comprising use of a modified predictive filter, for coding at least one current block of a succession of consecutive blocks of data, and wherein the method comprises the steps of:
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inputting digital audio data comprising said digital audio signal; calculating a backward filter for a past block, wherein the past block precedes the current block, determining coefficients of a modifying filter, as a function of said digital audio signal in the current block, combining said coefficients of said modifying filter with coefficients of said backward filter so as to generate information for calculating the modified predictive filter, constructing said modified predictive filter using the information; generating an encoded current block by applying said modified predictive filter to said current block, and sending said encoded current block and the information for calculating the modified predictive filter over a telecommunication network. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 16, 18)
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12. A method of decoding a digital audio signal received from a telecommunication network and comprising a succession of consecutive blocks of data, the method using a predictive filter for decoding a current block, the method comprising:
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receiving said succession of consecutive blocks of data; receiving information for calculating a modified predictive filter, wherein the received information provides modifying filter coefficients for forming a modifying filter; combining coefficients of a backward filter, calculated for a past block, preceding the current block, and the modifying filter coefficients, so as to generate information for calculating the modified predictive filter, constructing the modified predictive filter using the information, decoding said current block by applying said modified predictive filter to said current block, and outputting of an audio signal obtained by said decoding. - View Dependent Claims (13, 17)
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14. A signal encoding device for coding a digital audio signal comprising use of a modified predictive filter, for coding at least one current block of a succession of consecutive blocks of data, comprising at least:
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means for inputting digital audio data comprising said digital audio signal; means for calculating a backward filter for a past block, wherein the past block precedes the current block, means for determining coefficients of a modifying filter, as a function of said digital audio signal in the current block, means for generating information for calculating a modified predictive filter on the basis of a backward filter and at least as a function of the signal in the current block by combining said coefficients of said modifying filter with coefficients of said backward filter, means for constructing said modified predictive filter using the information, means for coding at least one current block using said modified predictive filter to generate an encoded current block, and means for sending said encoded current block and the information for calculating the modified predictive filter over a telecommunication network.
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15. A signal decoding device for decoding a digital audio signal received from a telecommunication network and comprising a succession of consecutive blocks of data, using a predictive filter for decoding a current block, the device, comprising at least:
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means for receiving a succession of consecutive blocks of data; means for receiving information for calculating a modified predictive filter, wherein the received information provides modifying filter coefficients for forming a modifying filter; means for combining coefficients of a backward filter, calculated for a past block, preceding the current block, and the modifying filter coefficients, so as to generate information for calculating the modified predictive filter, means for constructing the modified predictive filter using the information, means of decoding at least one current block by applying the modified predictive filter, and means for outputting an audio signal obtained by said decoding.
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Specification