Digital-to-analog converter with noise-free sigma-delta modulati

Details Digital-to-analog converter with noise-free sigma-delta modulati Digital-to-analog converter with noise-free sigma-delta modulati

1991-11-21

1993-04-06

Williams, Howard L.

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

341 77, 341131, H03M 302, H03M 120

Patent

active

052007502

ABSTRACT:
The digital-to-analog converter utilizes a modulator for effecting sigma-delta modulation of multi-bit input data to form a pattern of quantized output data so as to produce a pulse signal corresponding to the input data. The converter is provided with a zero detecting circuit for detecting a silent condition when the input data is continuously held at a zero level. An injecting circuit operates when the silent condition is detected for effecting continuous injection of a fractional reset signal into the modulator to gradually change an internal state of the modulator. A control circuit is provided to detect when the modulator reaches an optimum internal state effective to stabilize a varying idling pattern of the quantized output data for stopping the injection of the fractional reset signal so as to effect convergence of the varying idling pattern into a fixed idling pattern which is substantially free of an audible frequency component under the silent condition.

REFERENCES:
patent: 3855555 (1974-12-01), Burkhard et al.
patent: 4025852 (1977-05-01), Ching
patent: 4142066 (1979-02-01), Ahamed
patent: 4371972 (1983-02-01), Schwarz et al.
patent: 4937576 (1990-06-01), Yoshio et al.

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