Memory scanning radio receiver with separate channel data selection

Abstract

A radio receiver having RF, frequency converter, demodulator and audio stages, in which the frequency converter stage is connected to a local oscillator composed of a phase locked loop. The radio receiver includes a variable frequency divider inserted into the phase locked loop, a memory circuit for variably controlling the frequency dividing ratio of the frequency divider in accordance with a signal to be received, a scanning counter for supplying a read-out control signal to the memory circuit, a clock signal source for generating a clock signal, a counter control circuit for controlling supply and supply-terminating of the clock signal fed to the scanning counter, a level detecting circuit for detecting if a signal supplied to the RF stage has a level higher than a predetermined level, a switching circuit for switching a received channel, and a circuit for cutting off the clock signal fed to the scanning counter when outputs of the switching circuit and level detecting circuit are fed thereto.