Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1981-06-08
1987-10-27
Sloyan, T. J.
Communications: electrical
Audible indication
Percussion-type sound producer
323317, 340347CC, 340347M, 340347SH, H03M 166
Patent
active
047033100
ABSTRACT:
A digital-to-analog converter in accordance with the dynamic permutation principle in which a weighted series of accurate reference currents are generated by a cyclic permutation of currents which are equal to each other with a smaller degree of accuracy. The a.c. error component can then be eliminated by averaging the output signal of the converter over one full permutation cycle or an integral multiple thereof so that a signal without the error component is obtained by sampling at the end of every period. The setting of the digital-to-analog converter should not be changed during an averaging period.
REFERENCES:
patent: 3051938 (1962-08-01), Levy
patent: 3541446 (1970-11-01), Prozeller
patent: 3982172 (1976-09-01), van de Plassche
patent: 4125803 (1978-11-01), van de Plassche
Millman et al, Pulse and Digital Circuits, McGraw-Hill Book Co., Inc., 1956, pp. 22-37; 40-47.
Schmid, Electronic Analog/Digital Conversions, Van Nostrand Reinhold Co., 1970, pp. 168-179; 240-247.
The Engineering Staff of Analog Devices, Inc., Analog-Digital Conversion Handbook, 6/1972, pp. I-8; I-9; II-32 to II-35; II-44; II-45; II-46 to II-49; III-73 to III-83.
Franzblau Bernard
Mayer Robert T.
Sloyan T. J.
U.S. Philips Corporation
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