| 摘要 |
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<a 1 are amplified by a first constant value C 1 , signals with amplitude a 1<= a<a 2 are amplified proportional to 1/a, signals with amplitude a=2a are unchanged, signals with amplitude a 2< a<a 3 are attenuated proportional to 1/a, and signals with amplitude a=a 3 are attenuated by a second constant value C 2 ; 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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