Twelve Sound Channels During the Vertical Sync Interval of the Television Signal
G. G. Gassmann · IEEE Transactions on Broadcast and Television Receivers · 1970
The paper reports on a method for transmitting several audio signals within the video-signal spectrum so that, e.g. during satellite transmissions, audio signals associated with the picture can be transmitted and received-in several languages. The audio signals, each in one idle line, are transmitted in a time-compressed form during the vertical flyback. At the receiver the audio signal of the desired language is selected by a line selector, then stored e.g. in a MOS-storage and, in the original mode. retransmitted with a bandwidth of about 13 kHz to the sound amplifier during the consecutive frame.