Device for measuring and registering of sound

Details Device for measuring and registering of sound Device for measuring and registering of sound

1975-10-21

1977-01-18

Queisser, Richard C.

Measuring and testing

Speed, velocity, or acceleration

Centrifugal weight type

G01H 312

Patent

active

040032647

ABSTRACT:
A device is shown for detecting and recording the presence of sound above specified predetermined levels during given time intervals. The circuit includes a microphone, a filter, an amplifier, level detectors, light emitting diodes and a photosensitive material.

REFERENCES:
patent: 3545564 (1970-12-01), Barber
patent: 3780572 (1973-12-01), Rocha

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