SWITCH FOR QUIET TUNING OF A RADIO RECEIVER.

摘要

An AM/FM receiver provided with a frequency divider for frequency dividing the output frequency of a local oscillator to provide a count output which starts with "1" at the lower limit of a receiving frequency band and thereafter increases its count value for each constant frequency band (as the receiving frequency band is searched), a digital setter for setting a desired receiving frequency, and a comparator supplied with the outputs from the frequency divider and the digital setter to produce an output for gradually increasing or decreasing the output frequency of the local oscillator until the outputs from the frequency divider and the comparator come to coincide with each other. A desired broadcasting wave is automatically tuned with such a simple construction.