Sound multiplex in broadcasting

In broadcasting, 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 (like stereo or 5.1 surround sound), or alternative audio programming where an audio track in different language, alternative sports commentary, or audio description for people with visual impairment can be heard.

## Standards

This section is missing information about standard(s) for digital terrestrial TV, and another for satellite television. Please expand the section to include this information. Further details may exist on the talk page. (September 2018)

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Analogue television

* EIAJ MTS, a standard developed by Electronic Industries Association of Japan (EIAJ) in Japan
* Multichannel television sound (MTS), a standard developed in the United States, and adopted in Argentina, Brazil, Canada, Chile, Mexico, Philippines, Taiwan and United States
* Second audio program (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 (a.k.a. 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, a digital application of SCA
* HD Radio, a proprietary digital standard also established and used in the U.S. and Canada

## External links

* Pollack, Andrew (16 June 1984). "Japan's stereo TV system". The New York Times. https://www.nytimes.com/1984/06/16/business/japan-s-stereo-tv-system.html. Retrieved 19 September 2018.

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Broadcast video formats

Television

| Analog|

| 525 lines|

* System M
* NTSC
* NTSC-J
* PAL-M

|

625 lines|

* PAL
* System B
* System D
* System G
* System H
* System I
* System K
* PAL-N
* PALplus
* SECAM
* System B
* System D
* System G
* System K
* System L (SECAM-L)

Audio|

* BTSC (MTS)
* EIAJ
* NICAM
* SAP
* Sound-in-Syncs
* Zweikanalton (A2/IGR)

Hidden signals|

* Captioning
* CGMS-A
* EPG
* GCR
* PDC
* Teletext
* VBI
* VEIL
* VIT
* VITC
* WSS
* XDS

Historical|

* Pre-1940
* Mechanical television
* 180-line
* 405-line
* System A
* 441-line
* 819-line
* MAC
* MUSE

Digital|

| Interlaced|

* SDTV
* 480i
* 576i
* HDTV
* 1080i

|

Progressive|

* LDTV
* 1seg
* 240p
* 288p
* EDTV
* 480p
* 576p
* HDTV
* 720p
* 1080p
* UHDTV
* 2160p
* 4320p

MPEG-2 standards|

* ATSC
* DVB
* DVB 3D-TV
* ISDB
* DTMB

MPEG-4 AVC standards|

* ATSC A/72
* DMB
* DTMB
* DVB
* SBTVD
* 1seg

HEVC standards|

* ATSC 3.0
* HD DMB

Audio|

* AC-3 (5.1)
* AC-4
* DTS
* MPEG-1 Audio Layer II
* MPEG Multichannel
* PCM
* LPCM
* AAC
* HE-AAC
* MPEG-H 3D Audio

Hidden signals|

* AFD
* Broadcast flag
* Captioning
* CPCM
* EPG
* Teletext

Technical issues

* 9 compromise
* Broadcast-safe
* Digital cinema (DCI)
* Display motion blur
* Moving image formats
* MPEG transport stream
* Reverse Standards Conversion
* Standards conversion
* Television transmitter
* Test card
* Video on demand
* Video processing
* Widescreen signaling
* Templates (Analogue TV Topics)

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Analog television broadcasting topics

Systems|

* 180-line
* 405-line ( System A )
* 441-line
* 525-line ( System J , System M )
* 625-line ( System B , System C , System D , System G , System H , System I , System K , System L , System N )
* 819-line ( System E , System F )

Color systems|

* NTSC
* PAL
* PAL-M
* PAL-S
* PALplus
* SECAM

Video|

* Back porch and front porch
* Black level
* Blanking level
* Chrominance
* Chrominance subcarrier
* Colorburst
* Color killer
* Color TV
* Composite video
* Frame (video)
* Horizontal scan rate
* Horizontal blanking interval
* Luma
* Nominal analogue blanking
* Overscan
* Raster scan
* Safe area
* Television lines
* Vertical blanking interval
* White clipper

Sound|

* Multichannel television sound
* NICAM
* Sound-in-Syncs
* Zweikanalton

Modulation|

* Frequency modulation
* Quadrature amplitude modulation
* Vestigial sideband modulation (VSB)

Transmission|

* Amplifiers
* Antenna (radio)
* Broadcast transmitter/Transmitter station
* Cavity amplifier
* Differential gain
* Differential phase
* Diplexer
* Dipole antenna
* Dummy load
* Frequency mixer
* Intercarrier method
* Intermediate frequency
* Output power of an analog TV transmitter
* Pre-emphasis
* Residual carrier
* Split sound system
* Superheterodyne transmitter
* Television receive-only
* Direct-broadcast satellite television
* Television transmitter
* Terrestrial television
* Transposer
* Digital television transition

Frequencies & Bands|

* Frequency offset
* Microwave transmission
* Television channel frequencies
* UHF
* VHF

Propagation|

* Beam tilt
* Distortion
* Earth bulge
* Field strength in free space
* Knife-edge effect
* Noise (electronics)
* Null fill
* Path loss
* Radiation pattern
* Skew
* Television interference

Testing|

* Distortionmeter
* Field strength meter
* Vectorscope
* VIT signals
* Zero reference pulse

Artifacts|

* Dot crawl
* Ghosting
* Hanover bars
* Sparklies

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Analog and digital audio broadcasting

Terrestrial|

| Radio modulation|

* AM
* FM
* COFDM

|

Frequency allocations|

* LW (LF)
* MW (MF)
* SW (HF)
* VHF (low / mid / high)
* L band (Ultra high frequency

Digital systems|

* CAM-D
* DAB/DAB+
* DRM/DRM+
* FMeXtra
* HD Radio
* CDR
* DVB-T2 Lite

Satellite|

| Frequency allocations|

* C band
* Ku band
* L band
* S band

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Digital systems|

* ADR
* DAB-S
* DVB-SH
* S-DMB
* SDR

Commercial radio providers|

* Sirius XM Holdings
* SiriusXM Canada

Codecs|

* AAC
* AMR-WB+
* HDC
* HE-AAC
* MPEG-1 Audio Layer II

Subcarrier signals|

* AMSS
* DirectBand
* PAD
* RDS/RBDS
* SCA/SCMO
* DARC

Related topics

Technical (audio)|

* Audio data compression
* Audio signal processing

Technical (AM stereo formats)|

* Belar
* C-QUAM
* Harris
* Kahn-Hazeltine
* Magnavox

Technical (emission)|

* AM broadcasting
* AM expanded band
* Cable radio
* Digital radio
* Error detection and correction
* FM broadcast band
* FM broadcasting
* Multipath propagation
* Shortwave relay station

Cultural|

* History of radio
* International broadcasting

* Comparison of radio systems

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