Adaptive digital audio encoding system

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395 237, G10L 302, G10L 900

Patent

active

056490526

ABSTRACT:
An encoding system employing a novel perceptual spectrum difference estimation device improves the coding efficiency and audio quality of a digitized audio signal. The system comprises M number of encoding means arranged in parallel for encoding the input digital audio signal of a current frame, respectively; M number of decoding means arranged in parallel for decoding each of the encoded digital audio signals; a first estimator for estimating a power density spectrum for a difference signal between the input digital audio signal and each of the decoded digital audio signals; a second estimator for estimating a power density spectrum for the input digital audio signal of the current frame and for determining a masking threshold therefor based on the power density spectrum for the input digital audio signal; a third estimator for estimating a set of perceptual spectrum distances based on the power density spectrum for each of the difference signals and the masking threshold; and a circuit for selecting an encoded digital audio signal having a smallest perceptual spectrum distance.

REFERENCES:
patent: 4706290 (1987-11-01), Lim
patent: 5115469 (1992-05-01), Taniguchi et al.
patent: 5402495 (1995-03-01), Kim
Johnston, "Sum-Difference Stereo Transform Coding", ICASSP '92: Acoustics, Speech & Signal Processing Conference, pp.II-569-II-572 ,92.
Johnston, Transform Coding of Audio Signals Using Perceptual Noise Criteria, IEEE Journal on Selected Areas in Communications, vol. 6, No. 2 Feb. 1988.

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