Efficient coding of high frequency signal information in a signal using a linear/non-linear prediction model based on a low pass baseband
First Claim
1. A system for efficiently coding signal information via predictors, said system comprising:
- a) a high-pass filter extracting high-frequency components of said signal;
b) a low-pass filter extracting low-frequency components of said signal;
c) linear and non-linear predictors used in modeling a parametric representation of said high frequency components of said signal, said high frequency component modeled as;
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Accused Products
Abstract
An efficient coding scheme with higher audio bandwidth and/or better audio quality at lower bitrates, wherein the scheme eliminates long-term and short-term frequency domain correlation in a signal via frequency domain predictors. The coding scheme compresses information consisting of coded low frequency components as well as a parametric representation for the high frequency components based on a non-linear model. Additionally, by working on the frequency domain representations of the signal (such as the MDCT representation which is naturally available to a PAC encoder and decoder), low pass and high pass signal components are easily obtained by windowing the appropriate ranges of frequencies in the signal. Furthermore, the power functions of the signal are replaced by corresponding convolution functions of the same order.
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Citations
32 Claims
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1. A system for efficiently coding signal information via predictors, said system comprising:
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a) a high-pass filter extracting high-frequency components of said signal; b) a low-pass filter extracting low-frequency components of said signal; c) linear and non-linear predictors used in modeling a parametric representation of said high frequency components of said signal, said high frequency component modeled as; - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for efficiently coding signal information, said system comprising:
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a) a high-pass filter extracting high-frequency components of said signal; b) a low-pass filter extracting low-frequency components of said signal; c) predictors for eliminating interharmonic frequency correlation in said signal by modeling said high frequency components of said signal via linear predictors; d) non-linear predictors for modeling said high frequency components of said signal via a parametric representation using a non-linear predictor model; and e) an encoder encoding said extracted low-frequency components and parameters associated with said linear predictors. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method for efficiently coding signal information, said method comprising the steps of:
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a) extracting high-frequency components of said signal; b) extracting low-frequency components of said signal; c) modeling a parametric representation of said high frequency components of said signal with linear and non-linear predictors, said high frequency component modeled as; - View Dependent Claims (22, 23, 24, 25, 26)
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27. An article of manufacture comprising a computer usable medium having computer readable program code embodied therein for efficiently coding signal information, said medium comprising:
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a) computer readable program code extracting high-frequency components of said signal; b) computer readable program code extracting low-frequency components of said signal; c) computer readable program code modeling a parametric representation of said high frequency components of said signal with linear and non-linear predictors, said high frequency component modeled as; - View Dependent Claims (28, 29, 30, 31, 32)
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Specification