Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1977-10-04
1978-11-07
Richardson, Robert L.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
325 65, 324 57N, H04B 1700, G01R 2700
Patent
active
041248180
ABSTRACT:
A multiplex radio transmission system is provided with facilities for initiating protective switching from a working channel to an idle channel of the system when the signal to interference ratio on the working channel falls below a predetermined threshold value. A precise square-law detector derives, from the separate information and interference components of a signal on the working channel, a DC component and a difference-beat AC component which are processed to yield a quantity indicative of the desired signal to interference ratio. When such ratio falls below the predetermined threshold value, switching to an idle channel occurs in a manner similar to conventional signal-to-noise dependent protective switching arrangements.
REFERENCES:
patent: 3737781 (1973-06-01), Deerkoski
patent: 3835378 (1974-09-01), Edden et al.
patent: 3947770 (1976-03-01), Cavanagh et al.
Lin Sing H.
Yeh Yu S.
Bell Telephone Laboratories Incorporated
Chin Tommy P.
Levine Burton I.
Richardson Robert L.
Sherman Sylvan
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