Measuring and testing – Vibration – By mechanical waves
Patent
1976-11-08
1977-12-06
Queisser, Richard C.
Measuring and testing
Vibration
By mechanical waves
330 52, G01H 312
Patent
active
040610411
ABSTRACT:
This invention is a device for measuring small differences between relatively high sound pressure levels at two different microphone sites. It provides electrical insertion voltages, "pilot" voltages, as a means for continuously monitoring the gains of two acoustical channels. The difference between two pilot voltages is utilized to force the gain of one channel to track the other channel.
REFERENCES:
patent: 2836656 (1958-05-01), Schultz
patent: 2997668 (1961-08-01), Nolle
patent: 3154170 (1964-10-01), Noiseux
patent: 3964319 (1976-06-01), Fletcher
Fletcher James C. Administrator of the National Aeronautics and Space
Zuckerwar Allan J.
King William H.
Kreitman Stephen A.
Manning John R.
Osborn Howard J.
Queisser Richard C.
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