Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1981-10-06
1983-08-02
Sloyan, T. J.
Communications: electrical
Audible indication
Percussion-type sound producer
340347AD, 340347DA, 340347M, 370 7, H03K 1302
Patent
active
043969070
ABSTRACT:
A digital-analog converter functioning according to the .mu.-law wherein a sequence control receives an input digital signal and controls the position of a plurality of switches so as to selectively apply positive or negative voltages to a main resistor network and an auxiliary resistor network and further controls the plurality of switches in such networks for either grounding or connecting to an operational amplifier the outputs of said main and auxiliary resistor networks so as to produce an analog output signal. The invention is useful in time division multiplex telephone systems with digital subscriber stations, for example.
REFERENCES:
patent: 3582941 (1971-06-01), LeMaout et al.
patent: 4021800 (1977-05-01), Katagiri et al.
patent: 4138667 (1967-02-01), Vogel
The Engineering Staff of Analog Devices, "Analog-Digital Conversion Handbook" 6/1972 pp. 11-36-II-39.
Landee et al., Electronic Designers' Handbook, McGraw Hill Book Co., Inc., 1957, pp. 23-31 and 23-32.
Cecil et al., CMOS-Engineering For 10-Bit-D/A Converter Electronik Praxis, 2/1975, p. 32, No. 1/2.
Picard Peter
Wintzer Klaus
Siemens Aktiengesellschaft
Sloyan T. J.
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