Patent
1975-11-06
1977-03-22
Griffin, Robert L.
325419, 325453, 325455, 325464, H04B 144
Patent
active
040139573
ABSTRACT:
A channel-selecting apparatus for a multichannel transceiver designed to select, upon channel selection, a transmission-reception signal frequency specified for a given channel from among those of all the channels utilizing a phase locked loop system. The apparatus is provided with a channel changeover switch operated to give forth an electric pulse signal, each time one channel is shifted. Electric pulse signals generated upon operation of the switch as many times as the specified channel number being selected are counted by a counter, and then designate that of the matrix-arranged memory addresses of a read-only memory which represents the specified channel number in accordance with the counted number of electric pulse signals. A specified output code signal delivered from the read-only memory according to the address thus designated decides the ratio in which a signal frequency is to be divided by a programmable counter included in the phase locked loop, thereby completing the operation of selecting a desired channel. In case a relatively large number of channels are to be selected in succession, then there are provided an up/down counter and two channel changeover switches for up and down counting respectively or there is installed an additional channel changeover switch assembly designed to produce a certain number of (for example, ten) electric pulse signals, each time the assembly is operated, or, if necessary, both arrangements are used, thereby enabling channels to be changed by a very simple mechanism, even when the signal frequencies specified for the respective channels are not arranged at an equal frequency interval.
REFERENCES:
patent: 3602822 (1971-08-01), Evans et al.
patent: 3641434 (1972-02-01), Yates et al.
patent: 3753119 (1973-08-01), Close
patent: 3753142 (1973-08-01), Nardin et al.
patent: 3803494 (1974-04-01), Howell et al.
patent: 3845394 (1974-10-01), Hamada
patent: 3864637 (1975-02-01), Kanow
Griffin Robert L.
Kanda Tsushin Kogyo Co., Ltd.
Ng Jin F.
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