Filter circuit for digital-to-analog converter

Details Filter circuit for digital-to-analog converter Filter circuit for digital-to-analog converter

1983-07-18

1986-02-25

Shaw, Clifford C.

Communications: electrical

Audible indication

Percussion-type sound producer

328127, 328142, 328151, 340347SH, 364853, H03K 1302

Patent

active

045730334

ABSTRACT:
A filter circuit smooths the output signal of a digital-to-analog converter by providing linear ramps between adjacent steps of the signal. The circuit measures the voltage difference between two adjacent step levels, amplifies the difference voltage by a predetermined gain, 10 in the present example, then applies the amplified signal to an integrating network having a time constant which is determined by the amplifier gain and the sampling time of the D/A converter. The integrator output signal is summed over the sample period with the converter output signal level of the next preceding sample time period, thereby providing a waveform which has substantially linear transitions between adjacent D/A output levels.

REFERENCES:
patent: 3639848 (1972-02-01), Elliott
patent: 3649825 (1972-03-01), Burrage
patent: 3707713 (1972-12-01), Diaz et al.
patent: 3754233 (1973-08-01), Sutherland
patent: 3824382 (1974-07-01), Eshelman
patent: 4390844 (1983-06-01), Ting
patent: 4404546 (1983-09-01), Hata et al.
"Analog-Digital Conversion Handbook", D. H. Sheingold, ed., Analog Devices Inc., Norwood, Mass., 1972, pp. I-50, 1-99 through 1-100.

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