Method of processing audio signal

Details Method of processing audio signal Method of processing audio signal

1995-05-30

1997-07-22

MacDonald, Allen R.

395 209, 395 21, 395 235, 395 236, 395 239, G10L 500

Patent

active

056510934

ABSTRACT:
An audio signal is coded by converting the audio signal into a signal in a frequency domain and effecting a bit allocation on the converted audio signal. A masking threshold level for reducing aurally recognized noise due to a masking effect is determined using a signal spectral distribution in a present frame and a signal spectral distribution in a past frame. If the difference between the determined masking threshold level and a masking threshold level in the past frame is equal to or greater than a predetermined level, then a level limited to the difference corresponding to the predetermined level is regarded as a masking threshold level in the present frame.

REFERENCES:
patent: 5040217 (1991-08-01), Brandenburg et al.
patent: 5185800 (1993-02-01), Mahieux
patent: 5241603 (1993-08-01), Akagiri et al.
patent: 5285498 (1994-02-01), Johnston et al.
patent: 5317672 (1994-05-01), Crossman et al.
patent: 5471558 (1995-11-01), Tsutsui

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