Digital-to-analog converter useful in a television receiver

Details Digital-to-analog converter useful in a television receiver Digital-to-analog converter useful in a television receiver

1979-11-30

1982-12-14

Sloyan, Thomas J.

Communications: electrical

Audible indication

Percussion-type sound producer

235 92TF, 328111, 340347M, 455179, H03K 1302

Patent

active

043640265

ABSTRACT:
A digital-to-analog converter for use in a television tuning system to convert bits stored in a register to a corresponding tuning voltage includes a counter for generating binary pulse signals having pulses with durations proportional to powers of 2 and a plurality of selection gates for selecting ones of the binary pulse signals in accordance with the states of respective bits stored in the register to generate a plurality of output pulse signals each having G pulses with durations proportional to ##EQU1## where n is the number of the respective bit. The output pulse signals are justified with respect to each other by position-determining gates and combined to form G clusters of contiguous but non-overlapping pulses. The resulting pulse signal is filtered by a low/pass filter to derive the tuning voltage. G is selected as a compromise value consistent with both reasonable temperature stability and a reasonably fast filter response.

REFERENCES:
patent: 3603977 (1971-09-01), Szabo
patent: 3754233 (1973-08-01), Sutherland
patent: 4058772 (1977-11-01), Mogi et al.
patent: 4087813 (1978-05-01), Minner et al.
patent: 4095218 (1978-06-01), Crouse
"Digital Automatic Searcher" by Max Hegendorfer, Funktechnik, 1977, No. 11, appearing in pp. 183-185.
Matsu-ura et al., Low-Cost Digital Tuning System with Full-Function . . . , IEEE Transactions on Consumer Electronics, vol. CE-24, No. 4, 11/78, pp. 545-551.
Dreiske et al., Using a One-Chip Microprocessor for TV Tuning and . . . , IEEE Transactions on Consumer Electronics, vol. CE-24, No. 1, 2/78, pp. 47-55.

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