ON-VEHICLE RECEIVER

摘要

PROBLEM TO BE SOLVED: To receive a keyless signal of a remote operation even when radio is received by constructing an antenna and a part of a receiving circuit on the same body to a keyless signal of a remote operation and a radio signal and constructing frequency converting means on different bodies for the keyless signal and the radio signal. SOLUTION: This receiver is provided with a high frequency amplifier circuit 2, a mixing circuit 3a and a local oscillation circuit 4A which constitute a frequency converting means to a keyless signal in which a cryptographic code instructing the lock/unlock of a door, a trunk, etc., of a vehicle is superimposed on carrier additionally to a frequency converting means of a radio receiving side. The circuit 4A is composed of a SAW resonator, etc., and generates a fixed local oscillation frequency. A filter 32 on a radio receiving side eliminates the cryptographic code for keyless and extracts a voice signal, and a filter 33 on a keyless side eliminates a voice signal and extracts the cryptographic code to share an intermediate frequency amplifier circuit 19A with the same body.