Measuring and testing – Vibration – By mechanical waves
Patent
1980-10-30
1984-01-03
Crosland, Donnie L.
Measuring and testing
Vibration
By mechanical waves
34081511, 340500, 367198, 434185, 381 56, 381 57, G08B 2300, H04Q 100
Patent
active
044245114
ABSTRACT:
A noise level monitoring and indicating system includes plural microphones distributed about a classroom, bus, etc. and adapted to drive individual counters to indicate the number of times a minimum sound level has been exceeded by the signal from the associated microphone. Visual indicators are also provided to indicate the instantaneous noise status at selected microphones.
REFERENCES:
patent: 3144519 (1964-08-01), Herbig et al.
patent: 3304368 (1967-02-01), Ford et al.
patent: 3440349 (1969-04-01), Gibbs
patent: 3480912 (1969-11-01), Speeth et al.
patent: 3582671 (1971-06-01), Ott
patent: 3615162 (1971-10-01), Barber
patent: 3769844 (1973-11-01), Skoures
patent: 3797012 (1974-03-01), Gibbs et al.
"Lunchroom Traffic Lights", The Tampa Tribune, Section B, p. 1B, 12-27-80.
Crosland Donnie L.
Lavine Irvin A.
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