Digital-analog converter for converting digital audio signals

Details Digital-analog converter for converting digital audio signals Digital-analog converter for converting digital audio signals

1989-05-22

1991-02-12

Shoop, Jr., William M.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341144, 341152, H03M 182

Patent

active

049927922

ABSTRACT:
A data generator generates digital data at a sampling time interval .sub..DELTA. T (sampling frequency f.sub.s =1/.DELTA.T), and the three latest items of digital data V.sub.-1, V.sub.0, V.sub.+1 are repeatedly latched successively in three latch circuits every 3.multidot..sub..DELTA. T. A pulse response signal generator outputs unit pulse response signals of period 3.multidot..sub..DELTA. T at the time interval .multidot..sub..DELTA. T, and three multiplying-type DA converters multiply these three unit pulse response signals .phi..sub.0 (t+.sub..DELTA. T), .phi..sub.0 (t), .phi..sub.0 (t-.sub..DELTA. T) by the digital data V.sub.-1, V.sub.0, V.sub.+1, respectively, at a speed of a.multidot.f.sub.s (a times in time .sub..DELTA. T). The outputs of these multiplying-type DA converters are combined into an analog signal S.sub.A, which is delivered as an output.

REFERENCES:
patent: 4238831 (1980-12-01), Pulyer
patent: 4614934 (1986-09-01), Kobayashi et al.
patent: 4746903 (1988-05-01), Czarniak et al.
patent: 4862170 (1989-08-01), Hashimoto et al.

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