A Television Stereophonic System

The method of compatible stereophony described is especially designed for use with the aural channel of a television broadcast system. The make-up of the multiplex signal fed to the aural transmitter includes the use of a high fidelity 50-15,OOO c.p.s. L f R signal for the principal modulation. The L - R information is transmitted by double sideband suppressed subcarrier together with a novel pilot frequency arrangement for use at the receiver for regenerating the subcarrier required for L - R detection. Only one triode is required in the receiver demultiplexer. The stereo audio system is completed by the customary dual audio amplifiers and loudspeakers.