Radio receiver capable of suppressing a frequency drift in an intermediate frequency

Abstract From the Canadian patent

A radio receiver for receiving a radio signal includes a counter which determines an eventual intermediate frequency of an amplified signal based on a reference signal as a count datum. A frequency controller controls a reference frequency of the reference signal according to the count datum. A reference oscillator is controlled by the frequency controller to produce the reference signal. When receiving a radio signal by a double superheterodyne method, the radio receiver gives the eventual intermediate frequency to the amplified signal. In the amplified signal the frequency controller, suppresses an eventual frequency drift which results from frequency drifts of a first local oscillation …