Method for compressing audio signal using wavelet packet...

Details Method for compressing audio signal using wavelet packet... Method for compressing audio signal using wavelet packet...

2007-05-29

2007-05-29

Azad, Abul K. (Department: 2626)

Data processing: speech signal processing, linguistics, language

Speech signal processing

Psychoacoustic

Reexamination Certificate

active

10367997

ABSTRACT:
An audio compression method using wavelet packet transform (WPT) in MPEG1 layer 3 (hereinafter referred to as “MP3”) and a system thereof are provided. The method comprises calculating perceptual energy by analyzing audio samples which are input based on a psychoacoustic model; according to comparison of the level of the calculated perceptual energy with a threshold, selectively determining a modified DCT (MDCT) processing window and a wavelet packet transform (WPT) processing window; by processing audio samples corresponding to the scopes of the determined windows in the MDCT and WPT, converting the audio samples into data on frequency domains; and quantizing the processed data on the frequency domains according to the number of assigned bits.

REFERENCES:
Rulon et al.; A Comparison of Audio cpmpression transforms; Proceedings IEEE Mar. 25-28, 1999, pp. 253-257.

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