| 摘要 |
A circuit arrangement for tuning into one of a number of radioelectric signals receivable on a signal receiver set is provided in accordance with the teachings of the present invention. The circuit arrangement consists of a controllable oscillator, whose frequency is determined by a control loop, in accordance with a binary number N. The binary number N is supplied by a processing unit on the basis of coded input data. Within the control loop, frequency division occurs so that a first signal is obtained from the controllable oscillator which is dependent at least on the number N. This first signal is then compared with a second reference frequency signal, to obtain a third signal for required tuning. A memory with a number of storage locations for storing data relative to signals tuned in digital form is also provided. The storage locations of the memory are scanned sequentially, either automatically or manually, step-by-step, and the number N is supplied both in direct response to coded input data and by calling up data from the memory whereupon the processing unit, in response to a first coded input signal, is set to generate a first sequence of N numbers, corresponding to the total number of receivable radioelectric signals, according to a pre-established transmission standard and, in response to a second coded input signal, advances through one step of this sequence.
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