Telecommunications – Carrier wave repeater or relay system – With frequency conversion
Patent
1990-07-12
1994-04-05
Eisenzopf, Reinhard J.
Telecommunications
Carrier wave repeater or relay system
With frequency conversion
455114, 455306, 359146, H04B 715
Patent
active
053013557
ABSTRACT:
An infrared remote control signal is entered into a receiving circuit where it is converted into an electrical, modulated signal made up of a carrier and a command signal. The modulated input signal is sent to a control signal output circuit where it is filtered to send only the carrier of the remote input signal to a frequency-voltage conversion circuit. The frequency-voltage conversion circuit generates a control DC voltage according to the carrier frequency. The control DC voltage changes the pass band characteristic of a voltage-controlled filter in such a manner that the voltage-controlled filter selectively passes the desired fundamental frequency component and harmonic components of the carrier signal. The voltage-controlled filter also passes the command signal component. Thus, at the output of the voltage-controlled filter is obtained a modulated output signal whose carrier frequency is varied from that of the modulated input signal. With the carrier frequency changed, the resulting infrared remote control signal sent out from a transmitting circuit can be prevented from being affected or interfered with by external noise from fluorescent lamps.
REFERENCES:
patent: 2406923 (1942-06-01), Tunick
patent: 2614211 (1952-10-01), Goodall
patent: 4074198 (1978-02-01), Furuya
patent: 4221932 (1980-09-01), Anglikowski et al.
patent: 4339828 (1982-07-01), Chasek
patent: 4424593 (1984-01-01), Kamn
patent: 4563651 (1986-01-01), Omta et al.
Koinuma Hiroshi
Terashima Hiroshi
Eisenzopf Reinhard J.
Pham Chi
Pioneer Electronic Corporation
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