Radio communication apparatus

Details Radio communication apparatus Radio communication apparatus

1989-02-27

1991-06-25

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency or phase modulation

455 33, 455161, 455166, H04B 700

Patent

active

050274317

ABSTRACT:
A radio communication apparatus includes a device for sequentially discriminating whether or not different frequency channels are open or occupied and generating channel-condition signals representative thereof during each of cycles of a channel scan. The channel-condition signals correspond to the channels respectively. A device holds the channel-condition signals and thereafter outputs the channel-condition signals. A device detects a variation between a current channel-condition signal and a preceding channel-condition signal in respect of each of the channels. The current channel-condition signal is currently generated by the discriminating device. The preceding channel-condition signal is outputted from the holding device. A device detects whether or not a given identification signal is present in the channel where the detected variation occurs.

REFERENCES:
patent: 4009442 (1977-02-01), von Bromssen
patent: 4380826 (1983-04-01), Usugi
patent: 4597104 (1986-06-01), Ohki
patent: 4679225 (1987-07-01), Higashiyama

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