Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1983-06-16
1986-01-14
Sloyan, T. J.
Communications: electrical
Audible indication
Percussion-type sound producer
340347M, 340347CC, 340347SH, 328158, 364574, 364575, 364178, H03K 1317
Patent
active
045648310
ABSTRACT:
An analog to digital converter apparatus arranged to convert a plurality C (=4) of different input signals to digital representations thereof. The apparatus comprises a multiplexer arranged sequentially to couple each of the 4 input signals to a fast a-to-d converter (such as a successive approximations converter) at a rate such that each input signal is coupled N (=8) times in a period M (=20 m secs) of an a.c. series mode interfering signal (at 50 Hz) and at equal time intervals M/N (20/8=2.5 m secs). The N (=8) digital values of each input signal are averaged to provide at the end of a conversion period a digital value for each of the 4 input signals (C) which is the mean magnitude of the signal during the 20 m sec period (M).
REFERENCES:
patent: 3879724 (1975-04-01), McDonald
patent: 4073009 (1978-02-01), Andow et al.
patent: 4308098 (1981-12-01), Neuner et al.
patent: 4345311 (1982-08-01), Fielden
The Engineering Staff of Analog Devices, Inc., Analog-Digital Conversion Handbook, 6/1972, pp. I-30 & I-31; II-46 to II-51.
Attwood Michael J.
Wheable Desmond
Sloyan T. J.
Transamerica DeLaval Inc.
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