Astro Vellithirai
''Astro Vellithirai HD'' is a 24-hour Tanglish movie channel and also known as the Tamil version of the Asian HBO, showing the local and Kollywood movies. The channel began its broadcast on 16 April 2007 on channel 74, and moved to channel 202 on 1 October of the same year due to channel renumbering. Most of the movies are available in English subtitles. The channel is available for all Astro and NJOI customers. Logos File:Astro Vellithirai 2007.png, Previous logo. References Astro Malaysia Holdings television channels Television channels and stations established in 2007 Tamil-language television channels Vellithirai ''Velli Thirai'' () is a 2008 Indian Tamil language, Tamil-language satirical drama film directed by debutant Viji, the dialogue writer for Radha Mohan's films, and produced by Prakash Raj. It is a remake of the 2005 Malayalam film ''Udayananu ...

SDTV
Standard-definition television (SDTV, SD, often shortened to standard definition) is a television system which uses a resolution that is not considered to be either high or enhanced definition. "Standard" refers to it being the prevailing specification for broadcast (and later, cable) television in the mid- to late-20th century, and compatible with legacy analog broadcast systems. The two common SDTV signal types are 576i, with 576 interlaced lines of resolution, derived from the European-developed PAL and SECAM systems, and 480i based on the American NTSC system. Common SDTV refresh rates are 25, 29.97 and 30 frames per second. Both systems use a 4:3 aspect ratio. Standards that support digital SDTV broadcast include DVB, ATSC, and ISDB. The last two were originally developed for HDTV, but are also used for their ability to deliver multiple SD video and audio streams via multiplexing. In North America, digital SDTV is broadcast in the same 4:3 aspect ratio as ...
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