How many audio channels are specified in the multichannel television sound (MTS) standard developed by the Broadcast Television Systems Committee?

The multichannel television sound (MTS) standard, developed by the Broadcast Television Systems Committee (BTSC), specifies four audio channels. This system was designed to enhance the listening experience for television viewers by allowing for a richer audio representation. MTS includes a primary program sound (the mono sound for the main audio), along with three additional channels that can be used for various purposes, such as secondary audio programming or multilingual soundtracks. This combination allows broadcasters to create a more dynamic and engaging audio experience, supporting features like stereo sound and additional language tracks in a television broadcast, which have become common in modern broadcasting.