System for detecting one of a group of spectrally adjacent...

Details System for detecting one of a group of spectrally adjacent... System for detecting one of a group of spectrally adjacent...

H - Electricity

04

B

325/31

H04B 7/26 (2006.01)

Patent

CA 1127244

- 1- Abstract: The invention relates to a circuit for detecting the presence of a predetermined tone in received signals for a predetermined signal channel in a system for communication of radio signals which includes a predetermined tone in a plurality of tones. The circuit is comprised of a unit, responsive to the received signals for producing a further tone corresponding to the presence in the received signals of only a predetermined one of the plurality of tones. The further tone is much closer in frequency to a spectral spacing frequency between adjacent ones of the plurality of tones than it is to the frequency of any of the plurality of tones. A unit is provided which has a responsive bandwidth less than the spectral spacing frequency for detecting the further tone.

385761

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