Tunable perceptual weighting filter for tandem coders
First Claim
1. A method of processing one sequence of a plurality of sequences of input samples to generate a processed signal, the method comprising weighting the one sequence in a perceptual weighting filter, the perceptual weighting filter having a set of tunable parameters, the set of tunable parameters having preselected values that are based upon an output signal that has been encoded more than once and decoded more than once.
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Abstract
A tunable perceptual weighting filter is used in tandem codecs (coder/decoders). Specific filter parameters are advantageously tuned to provide improved performance in tandeming contexts. The parameters used are 10th order LPC (Linear Predictive Coding) predictor coefficients. The system employed uses Low-Delay Code Excited Linear Predictive codecs (LD-CELP).
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Citations
19 Claims
- 1. A method of processing one sequence of a plurality of sequences of input samples to generate a processed signal, the method comprising weighting the one sequence in a perceptual weighting filter, the perceptual weighting filter having a set of tunable parameters, the set of tunable parameters having preselected values that are based upon an output signal that has been encoded more than once and decoded more than once.
- 6. An apparatus for processing one sequence of a plurality of sequences of input samples to generate a processed signal, the device comprising a perceptual weighting filter for weighting the one sequence, the perceptual weighting filter having a set of tunable parameters, the set of tunable parameters having preselected values that are based upon an output signal that has been encoded more than once and decoded more than once.
- 11. A method of processing at least one sequence of input samples to generate a processed signal, the method comprising weighting the one sequence of input samples in a perceptual weighting filter, the perceptual weighting filter having a set of parameters having values that are based upon an output signal that has been encoded more than once and decoded more than once.
- 14. An apparatus for processing at least one sequence of input samples to generate a processed signal, the apparatus comprising a perceptual weighting filter for weighting the one sequence of input samples, the perceptual weighting filter having a set of parameters having values that are based upon an output signal that has been encoded more than once and decoded more than once.
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17. A method of processing sequences of input samples to generate a processed signal, the method comprising weighting at least one sequence of input samples in a perceptual weighting filter, wherein the perceptual weighting filter is given by:
- ##EQU8## where qi represents a predictor coefficient derived by a linear predictive coding analysis performed on one or more sequences of input samples previous to said one sequence, each z-i represents a delay of i samples, and α and
β
are parameters of the perceptual weighting filter, wherein α
is about 0.9 and β
is about 0.6.
- ##EQU8## where qi represents a predictor coefficient derived by a linear predictive coding analysis performed on one or more sequences of input samples previous to said one sequence, each z-i represents a delay of i samples, and α and
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18. An apparatus for processing sequences of input samples to generate a processed signal, the apparatus comprising a perceptual weighting filter applied to at least one sequence of input samples, wherein the perceptual weighting filter is given by:
- ##EQU9## where qi represents a predictor coefficient derived by a linear predictive coding analysis performed on one or more sequences of input samples previous to said one sequence, each z-i represents a delay of i samples, and α and
β
are parameters of the perceptual weighting filter, wherein α
is about 0.9 and β
is about 0.6.
- ##EQU9## where qi represents a predictor coefficient derived by a linear predictive coding analysis performed on one or more sequences of input samples previous to said one sequence, each z-i represents a delay of i samples, and α and
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19. A perceptual weighting filter for application to at least one sequence of input samples, wherein the perceptual weighting filter is given by:
- ##EQU10## where qi represents a predictor coefficient derived by a linear predictive coding analysis performed on one or more sequences of input samples previous to said one sequence, each z-i represents a delay of i samples, and α and
β
are parameters of the perceptual weighting filter, wherein α
is about 0.9 and β
is about 0.6.
- ##EQU10## where qi represents a predictor coefficient derived by a linear predictive coding analysis performed on one or more sequences of input samples previous to said one sequence, each z-i represents a delay of i samples, and α and
Specification