Analog to digital converter

Details Analog to digital converter Analog to digital converter

1993-09-07

1994-11-08

Young, Brian K.

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

H03M 300

Patent

active

053631013

ABSTRACT:
Analog audio signals supplied via an analog signal input terminal 1 are translated in parallel via a first .DELTA..SIGMA. modulator 2 and a second .DELTA..SIGMA. modulator 3 into digital audio data which are summed together by an additive node 4. The resulting sum data is attenuated in level by an attenuator 5 and translated by a decimation filter 6 into audio data having a predetermined number of bits and resulting audio data is outputted via an audio data output terminal 7. There is no necessity of providing a decimation filter for each .DELTA..SIGMA. modulator, so that the number of components may be reduced and the circuit may be simplified in construction to lower production costs. Besides, there is no necessity of re-quantizing the audio data at an output stage so that no quantization noise is produced to enable the S/N ratio to be improved by a theoretical value of 3 dB.

REFERENCES:
patent: 5073777 (1991-12-01), Fukuhara et al.
patent: 5196852 (1993-03-01), Galton

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