Emergency sound detector device

Details Emergency sound detector device Emergency sound detector device

1981-03-19

1983-04-12

Robinson, Thomas A.

Communications: electrical

Selective

Having indication or alarm

340 32, G08G 100, G01S 740

Patent

active

043800041

ABSTRACT:
A low-pass filter passes a spectrum of electrical signals which are utilized to establish a threshold level with which electrical signals having frequencies in a relatively higher range are compared to determine if a warning sound is present in the sounds in the vicinity of a receiver unit for receiving the ambient sound. If the rectified magnitude of the signals having the higher frequencies exceeds the rectified and variably adjusted magnitudes of the signals having lower frequencies, a visual indication is given to communicate the existence of a warning sound in the ambient sounds.

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