A/D converter

Details A/D converter A/D converter

1989-03-31

1991-01-08

Shoop, Jr., William M.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341155, 370 321, 379410, H03M 150

Patent

active

049839756

ABSTRACT:
An A/D converter included in an echo canceller or the like is furnished with a plurality of rate changing filters that receive the output signals of an oversampling A/D conversion circuit in common, the integration phases of the filters are different from each other as they are selectively advanced or retarded for each one of a plurality of predetermined intervals, and further furnished with an output selection circuit by which internal digital signals delivered as outputs from one of the rate changing filters are selectively transmitted according to the desired phase change.

REFERENCES:
patent: 4746902 (1988-05-01), Tol et al.
patent: 4852081 (1989-07-01), Bonnet et al.
patent: 4945359 (1990-07-01), Yamakido
Voice Band Telecommunications ICs, pp. 180-181.
"A Voice Band Codec with Digital Filtering", J. C. Candy et al, IEEE Transactions on Communications, vol. COM-29, No. 6, Jun. 1981, pp. 815-830.
"A Line Terminating Circuit Using the DSP Technique", N. Takami et al, Globecom '87, pp. 1731-1735.

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