RADIO BROADCASTING SYSTEM WITH CODE SIGNALING

摘要

FM radio broadcasting system with transmitter identification by means of a transmitted subcarrier whose frequency is a harmonic of subharmonic of the stereo pilot and which is binary phase modulated with transmitter identification signals. In the transmitter the subcarrier is locked to the stereo pilot and the unmodulated wave, which is required for detection of the transmitter identification signal, is derived in the receiver from the received stereo pilot.