Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1976-09-01
1978-07-04
Miller, Charles D.
Communications: electrical
Audible indication
Percussion-type sound producer
H03K 1302
Patent
active
040991741
ABSTRACT:
A converter has a ladder network of resistor means for converting binary words to amplitude values according to an expansion curve. One of the transverse resistor means of the ladder network comprises a resistor chain, each terminal of which is connected through one of a set of first switches to the output of the converter. Each of the nodes of the ladder network is connected through one of a set of second switches to one reference voltage. The first and second switches are activated in response to interval- and segment-identity signals, respectively. Each conversion is carried out by generating an actual combination comprising one interval- and one segment-identity signal, and, consequently, by switching one of the first and one of the second switches.
REFERENCES:
patent: 3303489 (1967-02-01), Krucoff
patent: 3573795 (1971-04-01), Bowers
patent: 3705359 (1972-12-01), Kappes
patent: 3906489 (1975-08-01), Schlichte
Miller Charles D.
Telefonaktiebolaget L M Ericsson
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