Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1976-07-19
1978-05-02
Sloyan, Thomas J.
Communications: electrical
Audible indication
Percussion-type sound producer
235 92TF, 325420, H03K 1302
Patent
active
040878139
ABSTRACT:
A circuit, for producing direct voltages, for example the tuning voltages for a television or radio receiver, lying within a direct voltage range from pulses fed to an integrating circuit at whose output the direct voltages appear. A plurality of pulses (I) are fed to the integrating circuit, at whose output the direct voltage (U.sub.I) appears, within a period duration (T) assigned to the desired direct voltage range, with the period duration (T) being at least of the magnitude T = (U.sub.max - U.sub.min) .multidot..DELTA..tau./.DELTA.U.sub.I, where (U.sub.max - U.sub.min) is the desired direct voltage range, .DELTA..tau. is the shortest time duration of a pulse (I) and .DELTA.U.sub.I is the smallest voltage step width associated with the shortest pulse duration .DELTA..tau. by which two different direct voltages (U.sub.I) at least differ from one another.
REFERENCES:
patent: 3603977 (1971-09-01), Szabo et al.
patent: 3629710 (1971-12-01), Durland
patent: 3681707 (1972-08-01), Bean
patent: 3836908 (1974-09-01), Hegendorfer
patent: 3942171 (1976-03-01), Haraszti et al.
Reiner, MOS Integrated Digital-Analog Converter, Funk-Technik, No. 7, 1975, pp. 180-184.
Texas Instruments Deutschland GmbH Application Laboratory, The TTL-Cookbook, pp. 154-157 (date established) 5/10/1976.
Minner Willy
Rall Bernhard
LICENTIA Patent-Verwaltungs-G.m.b.H.
Sloyan Thomas J.
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