CIRCUIT AND METHOD FOR CONTROLLING A CHANNEL DISPLAY IN A SUPERHETERODYNE RECEIVER

摘要

A superheterodyne receiver employs as a local oscillator a VCO (125) included in a PLL (115). Upon depression of a station selecting switch (200), pulses are generated and counted by a frequency division ratio setting counter. The count value thereof is loaded in the PLL to be displayed as the receiving frequency data and is also subjected to an arithmetic operation to evaluate a difference between the receiving frequency and the frequency of the lowest channel. The difference is divided by "3" and the quotient is displayed as the channel number data. The quotient is applied to a circuit, in which the quotient is determined to detect the channel index.