Signal converter, noise shaper, AD converter and DA converter

Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion

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Details

341144, H03M 100

Patent

active

055505449

ABSTRACT:
The present invention provides a first-order delta-sigma AD converter adapted to conduct noise shaping and having a quantizer arranged such that, when the amplitude of an input signal entered into the quantizer is small, the amplitude of a difference signal between the input signal entered into the quantizer and an output signal therefrom, is small. It is therefore possible to achieve an efficient AD- or DA-converter reduced in power consumption, which satisfies the transmission characteristics of the specifications of CCITT G.714 based on a method of PCM-encoding an audio frequency band signal stipulated in the specifications of CCITT G.711.

REFERENCES:
patent: 4772871 (1988-09-01), Suzuki et al.
patent: 4876543 (1989-10-01), van Bavel
patent: 5068661 (1991-11-01), Kaneaki et al.

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