MTS and The DTV Transition in The United States
As a component of the NTSC standard, MTS is no longer being used in U.S. full-power television broadcasting after the June 12, 2009 DTV transition in the United States. It remains in use in LPTV and in analogue cable television. All coupon-eligible converter boxes (CECBs) are required to output stereo sound via RCA connectors, but MTS is merely an optional requirement for the RF modulator that every CECB contains. NTIA has stated that MTS was made optional for cost reasons; this may have been due to a belief that MTS still required royalty payments to THAT Corporation, which is no longer true except for some digital implementations.
THAT has created consumer pages on the DTV transition and how it affects MTS. The site describes the situation by stating that most consumers with CECBs will end up with monaural TV sound, since RF-only connections are common and MTS is optional (and rare) for CECBs.
Read more about this topic: Multichannel Television Sound
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