EIAJ MTS
- View a machine-translated version of the Japanese article.
- Machine translation, like DeepL or Google Translate, is a useful starting point for translations, but translators must follow the LLM translation guideline, revise errors as necessary and confirm that the translation is accurate, rather than simply copy-pasting machine-translated text into the English Wikipedia.
- Consider adding a topic to this template: there are already 1,446 articles in the main category, and specifying
|topic=will aid in categorization. - Do not translate text that appears unreliable or low-quality. If possible, verify the text with references provided in the foreign-language article.
- You must provide copyright attribution in the edit summary accompanying your translation by providing an interlanguage link to the source of your translation. A model attribution edit summary is
Content in this edit is translated from the existing Japanese Wikipedia article at [[:ja:二重音声放送]]; see its history for attribution. - You may also add the template
{{Translated|ja|二重音声放送}}to the talk page. - For more guidance, see Wikipedia:Translation.
EIAJ MTS is a multichannel television sound standard created by the EIAJ.
Bilingual and stereo sound television programs started being broadcast in Japan in October 1978 using an "FM-FM" system originally developed by the NHK Technical Research Labs during 1962–1969. This system was modified and standardised by the EIAJ in January 1979. Television stations in Japan with capability for bilingual and stereo sound transmissions used the callsign JO**-TAM, where "TAM" denotes their audio FM multiplex sub-carrier designation, until digital switchover to ISDB-T in 2010–2012 which eventually rendered EIAJ MTS obsolete.
The original System M TV standard has a monaural FM transmission at 4.5 MHz. For Japanese multichannel television sound a second channel, or sub-channel, is added to the original signal by using an FM sub-carrier at twice the line frequency (Fh, or 15374 Hz). In order to identify the different modes (mono, stereo, or dual sound) a pilot tone is also added on an AM carrier at 3.5 times the line frequency. The pilot tone frequencies are 982.5 Hz for stereo and 922.5 Hz for dual sound. Contrary to Zweikanalton these pilot tones are not coupled to the line frequency but were instead chosen to allow use of filters already employed in the Pocket Bell pager system.[1]
See also
[edit ]- Multichannel Television Sound (3 additional audio channels on 4.5 MHz audio carriers)
- NICAM
- Zweikanalton A2
References
[edit ]- ^ Numaguchi, Yasutaka (December 1979). "Present Status of Multichannel-Sound Television Broadcasting in Japan". IEEE Transactions on Broadcasting. BC-25 (4): 128–136. Bibcode:1979ITB....25..128N. doi:10.1109/TBC.1979.266340. S2CID 19830970.
