broadcasting Broadcasting is the distribution of audio or video content to a dispersed audience via any electronic mass communications medium, but typically one using the electromagnetic spectrum (radio waves), in a one-to-many model. Broadcasting began wi ...

, sound multiplex is a method to deliver alternative audio feeds on television and radio channels.

Usage

This way, a television or radio channel can carry

surround sound Surround sound is a technique for enriching the fidelity and depth of sound reproduction by using multiple audio channels from speakers that surround the listener (surround channels). Its first application was in movie theaters. Prior to s ...

(like

stereo Stereophonic sound, or more commonly stereo, is a method of sound reproduction that recreates a multi-directional, 3-dimensional audible perspective. This is usually achieved by using two independent audio channels through a configuration ...

5.1 surround sound 5.1 surround sound ("five-point one") is the common name for surround sound audio systems. 5.1 is the most commonly used layout in home theatres. It uses five full bandwidth channels and one low-frequency effects channel (the "point one"). Dolb ...

), or alternative audio programming where an audio track in different language, alternative sports commentary, or

audio description Audio description, also referred to as a video description, described video, or more precisely called a visual description, is a form of narration used to provide information surrounding key visual elements in a media work (such as a film or te ...

for people with

visual impairment Visual impairment, also known as vision impairment, is a medical definition primarily measured based on an individual's better eye visual acuity; in the absence of treatment such as correctable eyewear, assistive devices, and medical treatment� ...

can be heard.

Standards

;Analogue television * EIAJ MTS, a standard developed by

Electronic Industries Association of Japan Founded in 1948, the Electronic Industries Association of Japan (EIAJ) was one of two Japanese electronics trade organizations that were merged into the Japan Electronics and Information Technology Industries Association (JEITA). Prior to the me ...

(EIAJ) in Japan *

Multichannel television sound Multichannel Television Sound, better known as MTS, is the method of encoding three additional audio channels into an analog NTSC-format audio carrier. It was developed by the Broadcast Television Systems Committee, an industry group, and somet ...

(MTS), a standard developed in the United States, and adopted in Argentina, Brazil, Canada, Chile, Mexico, Philippines, Taiwan and United States **

Second audio program Second audio program (SAP), also known as secondary audio programming, is an auxiliary audio channel for analog television that can be broadcast or transmitted both over-the-air and by cable television. Used mostly for audio description or oth ...

(SAP), part of MTS * Near Instantaneous Companded Audio Multiplex (NICAM), a standard developed in the United Kingdom, and adopted in major European and Asia-Pacific countries *

Zweikanalton Zweikanalton ("two-channel sound") or A2 Stereo, is an analog television sound transmission system used in Germany, Austria, Australia, Switzerland, Netherlands and some other countries that use or used PAL-B or PAL-G. TV3 Malaysia formerly used ...

( A2 Stereo), a standard developed in Germany, and mainly adopted in Australia, Austria, Germany, Netherlands, South Korea and Switzerland ;Analogue radio * Subsidiary communications authority (SCA), a standard developed in the United States, and also adopted in Canada **

FMeXtra FMeXtra is a deprecated in-band on-channel digital radio broadcasting technology created by Digital Radio Express. It is intended to allow a second all-digital signal to be broadcast in simulcast fashion with an existing analog FM radio station, of ...

, a digital application of SCA *

HD Radio HD Radio (HDR) is a trademark for an in-band on-channel (IBOC) digital radio broadcast technology. It generally simulcasts an existing analog radio station in digital format with less noise and with additional text information. HD Radio is used ...

, a proprietary digital standard also established and used in the U.S. and Canada

External links

* Broadcasting Sound {{Bcast-stub