Communications: electrical – Audible indication – Ultrasonic pest control
Patent
1976-01-19
1977-01-04
Pitts, Harold I.
Communications: electrical
Audible indication
Ultrasonic pest control
340384R, G08B 100
Patent
active
040018164
ABSTRACT:
An electronic chime wherein at least two different audible frequency signals forming chime sound are generated by a frequency divider oscillated by an oscillating circuit capable of adjusting its output standard frequency clock pulse. These audible frequency signals are respectively amplitude modulated so as to be attenuated stepwise, and the chime sound is generated by such modulated signals and caused to disappear at attenuated state.
REFERENCES:
patent: 3872471 (1975-03-01), Bird
Imamura Yoshio
Morisue Kazushige
Shimomura Hiroshi
Yamada Kiyoshi
Matsushita Electric & Works Ltd.
Matsushita Electric - Industrial Co., Ltd.
Pitts Harold I.
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