Communications: electrical – Audible indication – Ultrasonic pest control
Patent
1975-06-06
1976-12-28
Caldwell, John W.
Communications: electrical
Audible indication
Ultrasonic pest control
340323R, 331 78, 307261, 84 101, G08B 300
Patent
active
040004899
ABSTRACT:
The disclosed circuit provides a signal generator which is particularly adapted for use as an audible "kilo-sonic" game device in which a plurality of switches are provided so that the different combinations of switch positions produce a corresponding number of different sounds. The circuit includes a voltage-controlled-oscillator (VCO) having an output coupled to a transducer such as a speaker. The VCO is modulated in accordance with a control signal, provided by an up-down staircase generator which is responsive to a pulse generator, to vary the frequency of its output signal. The output of the pulse generator is also selectively coupled with the output of the staircase generator. Time-constant circuits in each of the generators are respectively under the control of selected ones of the switches; and two basic modes of operation are provided by the selected switches so that the control signal at the VCO input is either a pseudo random signal, or a synchronized sub-multiple signal wherein the frequency of the staircase generator output signal is a sub-multiple of the pulse generator output signal. Accordingly, the number of different output sounds provided by the disclosed circuit is geometrically proportional to the number of switches provided.
REFERENCES:
patent: 2683219 (1954-07-01), Mohr
patent: 2871378 (1959-01-01), Lohman
patent: 2918574 (1959-12-01), Gimpel et al.
patent: 3838418 (1974-09-01), Brown
B-Cubed Engineering, Inc.
Caldwell John W.
Wannisky William M.
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