| 摘要 |
A circuit arrangement for tuning into one of a number of radioelectric signals receivable on a signal receiver, comprising a controllable oscillator the frequency of which is determined by a control loop depending on a digital number N from a processing unit, in turn, dependent on coded input data. The loop comprises a frequency divider for obtaining a first signal from the controllable oscillator depending at least on the number N and a comparitor for comparing the first signal with a second frequency reference signal so as to obtain a third signal for required tuning. The circuit arrangement further prevents signals from being sent to the receiver loudspeaker for a preset length of time if the variation in the number N is over a preset threshold within a preset time interval.
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