ABSTRACT
Multichannel television sound (MTS) is a generic term for the process of adding subcarriers to the aural carrier of a National Television System Committee (NTSC) television station. The development of a two-channel stereo MTS system was accomplished through the Broadcast Television Systems Committee (BTSC) of the Consumer Electronics Association (CEA), formerly known as the Electronic Industries Association (EIA). The resulting system is known as the BTSC system for television stereo sound. Subcarriers in the BTSC system are designed to be received by the public and are used for stereophonic sound and, simultaneously, a second audio program (SAP) channel for a second language or other program services intended for reception by the public. A third subcarrier in the BTSC system may be used by the broadcaster for professional applications such as news crew cues (IFB), transmitter telemetry, or other digital/analog or aural/data services. The BTSC stereo system is completely compatible with monophonic receivers.
