Fast settling tone/data processing circuit

Details Fast settling tone/data processing circuit Fast settling tone/data processing circuit

H - Electricity

04

B

325/87

H04B 1/16 (2006.01)

Patent

CA 1312920

45-MR-00567 FAST SETTLING TONE/DATA PROCESSING CIRCUIT ABSTRACT In a radio employing continuous tone or digital coded squelch system, fast settling tone processing circuitry is disclosed for a tone processing path which includes an FM detector, low pass filters and a tone limiter. In an exemplary embodiment, a capacitor at the output of the FM detector in the tone/data processing path is charged as rapidly as possible to a new DC level, for example, by an off frequency transmitter. A pulse is generated by, for example, the transceiver microprocessor which initiates the rapid charging of the capacitor as soon as it is detected that data needs to be read from the tone/digital data processing circuitry for decoding. Such a pulse is generated by the microprocessor whenever channel frequencies are changed and/or the carrier activity sensor becomes active.

601484

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