TRANSVERSE CHARGE-TRANSFER FILTER

摘要

Radio receiving apparatus for receiving signals in plural frequency bands. Plural signal processing channels are provided, each channel being associated with a respective frequency band and each being tunable to different frequencies within its associated band to derive information signals when tuned to broadcast frequencies. Depending upon which of the signal processing channels is tuned to a broadcast frequency, a controllable switch connects that channel to an output circuit so as to supply the derived information signals thereto. A pulse generator generates intermittent pulse signals when the tuning condition of at least one of the signal processing channels is changed. These pulse signals are used to sample the tuning condition of that signal processing channel to determine if that channel is tuned to a broadcast frequency. A switch control circuit controls the switch to connect to the output circuit the particular signal processing channel which is tuned to a broadcast frequency.