Communications – electrical: acoustic wave systems and devices – Selective
Patent
1980-05-19
1982-03-30
Pitts, Harold I.
Communications, electrical: acoustic wave systems and devices
Selective
34082577, G08B 310
Patent
active
043227180
ABSTRACT:
There is disclosed herein a sound-activated device which is adapted to operate rotary loads, such as a turntable, a circular display, a suspended mobile and/or a fan. The device includes a power supply, an electric motor connected to the power supply and to the rotary load. A sound-activated circuit is coupled to the power supply and electric motor for causing the rotary load to operate when sound having a value in excess of a predetermined level is detected.
The circuit includes a sound transducer coupled to a signal processing and conditioning unit. A threshold audio sensitivity control is associated with the processing unit for establishing the predetermined level. A timer triggering circuit is coupled to the processing unit and is activated when the threshold is exceeded and then generates a timer trigger signal. The timer trigger circuit receives the trigger signal and is activated in response thereto for a preset time. An electronic switch is coupled to the timer circuit for operating the motor when the switch receives the timer circuit signal.
REFERENCES:
patent: 3757303 (1973-09-01), Blass
patent: 3801959 (1974-04-01), O'Brien
patent: 3855574 (1974-12-01), Welty
patent: 4084138 (1978-04-01), Wycoff
patent: 4103294 (1978-07-01), Stettner
patent: 4176286 (1979-11-01), Shuffield
patent: 4211998 (1980-07-01), Junginger
Goldberg Jerome
Pitts Harold I.
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