Sound level meter

Details Sound level meter Sound level meter

1977-04-06

1978-07-25

Queisser, Richard C.

Measuring and testing

Vibration

By mechanical waves

G01H 312

Patent

active

041022084

ABSTRACT:
In a sound level meter the output voltage of the microphone is fed to a voltage-frequency converter by way of an exponentially operating circuit, such as a squarer, and the output of the converter operates a binary counter having an indicator unit associated therewith. A gate circuit is controlled by a timing generator and is interposed between the voltage-frequency converter and the binary counter. The indicator unit includes a plurality of indicating elements which are connected at the outputs of the successive counter stages and each of the indicator elements is associated with a particular indicia carried on a dB scale. With a squarer as the exponential circuit the dB scale has a 3 dB incrementation for the respective indicator elements.

REFERENCES:
patent: 2590460 (1952-03-01), Rackey et al.
patent: 3802535 (1974-04-01), Peake et al.
patent: 3977257 (1976-08-01), Steger

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