Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1982-06-04
1984-07-10
Miller, C. D.
Communications: electrical
Audible indication
Percussion-type sound producer
H03K 1302
Patent
active
044595808
ABSTRACT:
A plurality of resistance elements are connected via cutoff switches to form a ring. One of the connection points of each cutoff switch with the respective resistance element is connected via a feed switch to a common power source and via an output switch to a common output terminal. The other connection point of each cutoff switch with a resistance elements is connected via a grounding switch to a common potential point. An operation of turning OFF one of the cutoff switches, simultaneously turning ON the feed switch and the grounding switch on both sides of the turned-OFF cutoff switch, and turning ON the output switch selected in accordance with an input digital value, is repeated with a fixed period for all of the cutoff switches in a sequential order, while retaining the relative positions of the switches on the ring. By smoothing the output at the output terminal, scattered resistance values of the resistance elements are averaged. The invention is also applicable to a ladder network, and includes other modifications.
REFERENCES:
patent: 2782408 (1957-02-01), Fisher et al.
Miller C. D.
Takeda Riken Kogyo Kabushikikaisha
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