Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1979-03-29
1981-04-28
Griffin, Robert L.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
3581941, H04N 500, H04B 900
Patent
active
042649820
ABSTRACT:
An infrared remote control transmitter includes at least one infrared light-emitting diode poled with respect to a point of reference potential so as to be conductive in response to voltages having the opposite polarity of a DC supply voltage and to be nonconductive in response to voltages having the same polarity as the DC supply voltage. A push-pull amplifier is responsive to a pulse signal encoded to represent a remote control message to selectively couple the DC supply voltage or the reference potential to a capacitor coupled in series between the push-pull amplifier and the light-emitting diode. The capacitor is charged and discharged and an alternating drive voltage for the light-emitting diode having portions with polarities both the same as and opposite to the polarity of the DC supply voltage is generated. The push-pull amplifier is arranged so that when a component failure occurs, the portions of the alternating drive voltage having the polarity opposite to the polarity of the DC supply voltage are at least inhibited to prevent the continuous (i.e., DC) emission of infrared radiation.
REFERENCES:
patent: 3577017 (1971-05-01), Duke et al.
patent: 3648073 (1972-03-01), Sams et al.
patent: 3794841 (1974-02-01), Cosentino et al.
patent: 3984705 (1976-10-01), George
patent: 4027280 (1977-05-01), Beyers, Jr.
patent: 4044297 (1977-08-01), Nobue et al.
patent: 4158151 (1979-06-01), Grundler
Brown et al., Avalanche Transistors Drive Laser Diodes Hard and Fast-Electronics, Nov. 14, 1966, pp. 137-139.
Vanderwall et al., Subnanosecond Rise Time Pulses From Injection Lasers-IEEE Jour. Quantum Elect. Jul. 1974, pp. 570, 571.
AGG-Telefunken Product Description-Integrated Circuits for Perpheric TV Functions-IR-Remote Control U321M Dec. 1977.
AMI-Advanced Product Description 52600/52601 Encoder-Decoder Remote Control 2-Chip Set, Jan. 1978.
Emanuel Peter M.
Griffin Robert L.
Orsino Jr. Joseph A.
Rasmussen Paul J.
RCA Corporation
LandOfFree
Drive circuit for an infrared remote control transmitter does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Drive circuit for an infrared remote control transmitter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Drive circuit for an infrared remote control transmitter will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-867508