Dual bandwidth autozero loop for a voice frequency CODEC

Details Dual bandwidth autozero loop for a voice frequency CODEC Dual bandwidth autozero loop for a voice frequency CODEC

1980-07-18

1982-09-21

Sloyan, Thomas J.

Communications: electrical

Audible indication

Percussion-type sound producer

340347AD, 340347M, H03K 1308

Patent

active

043509754

ABSTRACT:
An autozero loop for eliminating offsets in the analog to digital converter section of a voice frequency coder-decoder (CODEC) utilizing an array of capacitors and a linear resistor string. The autozero loop functions with a relatively small time constant to null offsets quickly during the power-up phase of CODEC operation and with a higher time constant after the power-up phase. A dual bandwidth sub-circuit in the loop is connected to a voltage generator and controlled by signals from a logic circuit to operate at different bandwidths and thus provide different offset cancelling feedback signals during the power-up and normal operating phases.

REFERENCES:
patent: 4143361 (1979-03-01), Tammes et al.
patent: 4195282 (1980-03-01), Cameron
patent: 4200863 (1980-04-01), Hodges et al.

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