Conversion between analogue and digital signals

Details Conversion between analogue and digital signals Conversion between analogue and digital signals

1995-09-14

1997-08-26

Gaffin, Jeffrey A.

Coded data generation or conversion

Digital code to digital code converters

Data rate conversion

341144, 341155, 3647241, G11B 2730, G11B 500

Patent

active

056614780

ABSTRACT:
Analogue to digital (A/D) and digital to analogue (D/A) converters perform the required conversion at a higher sampling rate (e.g. 64Fs) and a lower resolution (e.g. 1 to 4 bits) than the actual sampling rate (Fs) and resolution (e.g. 16 bits) of the required digital signal. The oversampled low resolution signal is generated by oversampling the input digital signal (for D/A conversion) or is decimated to generate the required output digital signal (for A/D conversion). The oversampling or decimation filters are switchable between two modes of operation, in which different signal delays are imposed by the filter. Thus a lower quality, but shorter delay, filter can be used in converters in the signal path for an artist's foldback signal. This can reduce the subjectively disturbing effects of long conversion delays in the foldback signal path.

REFERENCES:
patent: 4853797 (1989-08-01), Yamada et al.
patent: 5197101 (1993-03-01), Mok
patent: 5276557 (1994-01-01), Nagashima et al.
patent: 5559513 (1996-09-01), Rothermel et al.
patent: 5561424 (1996-10-01), Norsworthy et al.

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