ELECTRONIC TUNER FOR BROADCAST RECEIVER

摘要

A broadcast receiver having a tuner with a variable local oscillator for generating a local frequency signal, a divider for dividing the local frequency signal by a variable dividing ratio, a comparator for comparing the divided local frequency signal with a reference signal and producing a corresponding output by which the local oscillator frequency is controlled, a counter having a variable content by which the dividing ratio of the divider is determined for establishing the radio broadcast frequency to which the receiver is tuned, and a pulse generator operative to vary the counter content; is further provided with means for detecting the reception of radio waves by the receiver, a memory having memory elements each corresponding to a respective counter content and in which a signal is stored when the reception of radio waves is detected for that content of the counter, whereby to memorize those broadcasting stations from which the transmissions can be received, and a display device having indicator elements respectively corresponding to the memory elements and by which the storage of signals in the respective memory elements is visually indicated. Various control circuits are provided, for example, to operate the pulse generator until the receiver is tuned to a selected receivable station determined by actuation of the respective indicator element, or until the receiver is tuned to the receivable station broadcasting with the next lower frequency, or to operate the pulse generator for scanning the broadcasting band with pauses at each of the receivable stations identified by the storage of signals in the respective memory elements.