Digital-to-analog converter circuit

Details Digital-to-analog converter circuit Digital-to-analog converter circuit

1985-03-06

1986-07-15

Miller, Charles D.

Communications: electrical

Audible indication

Percussion-type sound producer

340347SH, H03M 166

Patent

active

046009159

ABSTRACT:
A digital-to-analog converter circuit for converting digitized audio signals to analog form having improved phase characteristics and a reduced noise level while employing a less costly low-pass filter than conventional circuits. A digital-to-analog converter converts an analog signal, which has frequency components within a range lower than a first frequency, to analog form. A sample-and-hold circuit samples and holds the output of the digital-to-analog converter at a second frequency more than twice as high as the first frequency. Frequency components in the output of the sample-and-hold circuit above a third frequency between the first and second frequencies are phase inverted. The output of the sample-and-hold circuit and the output of the inverting circuit are summed and applied to a low-pass filter, the output of which provides the analog output from the circuit.

REFERENCES:
patent: 4306222 (1981-12-01), Peek

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