Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1986-03-25
1987-10-13
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
250551, 307117, G02B 2700, H01H 3500
Patent
active
047000600
ABSTRACT:
The device includes an audio signal circuit having two separate terminals that are connected through the photoresistor elements of two, separate, optical isolators with an audio signal input/output terminal, so that signals can be routed selectively and bidirectionally along separate signal paths to or from the input/output terminal to one or both of the two separate terminals. A separate control circuit supplies DC power selectively to the LED's which control the selective energization of the photoresistor elements of the optical isolators, the advantage being that the photoresistive devices permit selective blocking of the audio signal paths without physically opening or interrupting the paths and thus avoiding objectionable signal spikes and consequent loud popping sounds in associated loud speaker systems. The DC control circuit includes two, manually operable double pole, double throw switches for controlling the selective routing of signals between the audio signal terminals.
REFERENCES:
patent: 4176401 (1979-11-01), Lonberger
patent: 4320388 (1982-03-01), McCarthy et al.
Cornell Carl L.
Laiacona Michael N.
Thompson William
Allen S.
Nelms David C.
Whirlwind Music Distributors, Inc.
LandOfFree
Device for selectively routing audio signals bidirectionally alo does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Device for selectively routing audio signals bidirectionally alo, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Device for selectively routing audio signals bidirectionally alo will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-412769