Word length convertor

Details Word length convertor Word length convertor

1997-03-06

1999-03-02

Hoff, Marc S.

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

341118, H03M 302

Patent

active

058777164

ABSTRACT:
In a digital-data processing unit provided by the present invention, the level of 1-bit digital audio data resulting from DELTA-SIGMA modulation is adjusted by means of a multiplier. A digital audio data signal with the level thereof adjusted then undergoes DELTA-SIGMA modulation carried out by a low-pass DELTA-SIGMA modulator. As a result, digital audio signal with the word length thereof restored to its original value is obtained. In this case, high-frequency noise included in the digital audio data is removed.

REFERENCES:
patent: 3706944 (1972-12-01), Tewksbury
patent: 4371850 (1983-02-01), Klement
patent: 4746899 (1988-05-01), Swanson et al.
patent: 5068659 (1991-11-01), Sakaguchi
patent: 5191331 (1993-03-01), Karema et al.
patent: 5243345 (1993-09-01), Naus et al.
patent: 5625358 (1997-04-01), Wilson et al.
patent: 5682161 (1997-10-01), Ribner et al.
patent: 5701124 (1997-12-01), Ichimura et al.

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