Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1980-06-18
1982-03-30
Ng, Jin F.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
3581941, H04B 106, H04N 546
Patent
active
043228550
ABSTRACT:
A remote control apparatus having a commander and a receiver. In a wireless remote control system for a television receiver having a channel command device and a responding device, the channel command device includes a channel selecting circuit for selecting one channel command from among a plurality of predetermined channel commands, a command signal generating circuit for generating a channel command signal corresponding to a selected channel command, and a channel command transmitting circuit having a speaker for transmitting the channel command signal; and the responding device includes a channel command receiving circuit having a microphone for receiving the transmitted channel command signal and a channel command discriminating circuit for discriminating the channel command signal and supplying a channel selecting signal corresponding to the discriminated channel command signal to control a tuning circuit of the television receiver. Further, there is provided in the responding device, a return signal generating circuit for producing a return signal corresponding to the channel command indicated by the channel selecting signal and a return signal transmitting circuit having a speaker for transmitting the return signal, while the channel command device further has a return signal receiving circuit having a microphone for receiving the transmitted return signal, a return signal discriminating circuit for discriminating the return signal and producing a discriminated return signal indicating the channel command to which the return signal corresponds, a comparing circuit for comparing the originally selected channel command and the discriminated return signal, and an indicating circuit connected to the comparing circuit for indicating a coincidence of the originally selected channel command and the discriminated return signal.
REFERENCES:
patent: 3668307 (1972-06-01), Face et al.
patent: 3794922 (1974-02-01), Osborne et al.
patent: 3987397 (1976-10-01), Belcher et al.
patent: 4081747 (1978-03-01), Meyerle
patent: 4156847 (1979-05-01), Tazawa et al.
patent: 4197498 (1980-04-01), Fukui et al.
Ishigaki Yoshio
Mogi Takao
Murakami Shigetoshi
Okada Hisao
Eslinger Lewis H.
Ng Jin F.
Sinderbrand Alvin
Sony Corporation
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