Method of modifying low frequency components of a digital...

Details Method of modifying low frequency components of a digital... Method of modifying low frequency components of a digital...

2007-06-19

2007-06-19

Tran, Sinh (Department: 2615)

Data processing: generic control systems or specific application

Specific application, apparatus or process

Digital audio data processing system

C381S106000, C381S107000

Reexamination Certificate

active

10659049

ABSTRACT:
A method of modifying low frequency components of a digital audio signal having left and right channel signals, including the steps of: a) filtering the left and right channels signals using respective left and right high-pass filters to form left and right high-pass filtered signals; b) filtering the left and right channel signals using respective left and right band-pass filters to form left and right low frequency signals; c) modifying the amplitude of the left and right low frequency signals to give modified left and right low frequency signals whereby signals with amplitude a where 0<a<a1are amplified by a first constant value C1, signals with amplitude a1≦a<a2are amplified proportional to 1/a, signals with amplitude a=2a are unchanged, signals with amplitude a2<a<a3are attenuated proportional to 1/a, and signals with amplitude a=a3are attenuated by a second constant value C2; and d) combining the modified band-pass filtered left and right signals with the respective left and right high-pass filtered signals to form respective modified left and right channel audio signals.

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Syntrillium Software Corp., Cool Edit User's Manual, copyright 1992-1996, version 1.53 and 95.
Syntrillium Software Corp., Cool Edit 2000 main webpage [http://web.archive.org/web/20000229111435/63.90.82.57/cooledit/main.html], Feb. 29, 2000.

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