Method of compressing an audio signal using adaptive bit allocat

Details Method of compressing an audio signal using adaptive bit allocat Method of compressing an audio signal using adaptive bit allocat

1993-03-04

1995-12-12

MacDonald, Allen R.

Electrical audio signal processing systems and devices

Hearing aids, electrical

Specified casing or housing

395 238, 395 239, 381 30, G10L 500

Patent

active

054757894

ABSTRACT:
An audio signal is coded by converting the audio signal into a signal in a frequency domain and effecting a big 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), Brondenburg et al.
patent: 5185800 (1993-02-01), Mahieux
patent: 5241603 (1993-08-01), Akagiri et al.
patent: 5285498 (1994-02-01), Johnston
patent: 5317672 (1994-05-01), Crossman et al.

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