Vehicle pass-by and community noise monitor

Details Vehicle pass-by and community noise monitor Vehicle pass-by and community noise monitor

1979-10-29

1981-09-08

Kreitman, Stephen A.

Measuring and testing

Vibration

By mechanical waves

G01H 312

Patent

active

042877717

ABSTRACT:
The disclosure is related to a sound level meter including unique features for measuring, storing and displaying a maximum sound level generated by a passing motor vehicle or the like. The meter operates as an ordinary sound level meter until a predetermined threshold noise level is reached, at which time a novel circuit continuously detects the incoming sound level and electrically stores the maximum value detected. A comparison means compares the incoming sound level with the maximum stored level. When the incoming sound level decreases by a predetermined amount below the maximum stored value, a circuit is energized to lock the maximum value detected in a memory device. Additional means are provided to visually display the stored value.

REFERENCES:
patent: 3661224 (1972-05-01), Allen et al.
patent: 3696206 (1972-10-01), Ida et al.
patent: 3778552 (1973-12-01), Edinborgh
patent: 3802535 (1974-04-01), Peake et al.

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