A-MAC: Difference between revisions

File:PAL and D2-MAC transmissions.png

The simultaneous PAL transmission of all TV-picture elements and the multiplexed transmission of the TV picture elements with D2-MAC.

Simulated MAC signal. From left to right: digital data, chrominance and luminance

History of A-MAC

A-MAC carries the digital information: sound, data-teletext on an FM subcarrier at 7MHz. Since the vision bandwidth of a standard MAC signal is 8.4MHz, the horizontal resolution on A-MAC has to be reduced to make room for the 7MHz carrier. A-MAC has not been used in service.

MAC FAQ

MAC transmits luminance and chrominance data separately in time rather than separately in frequency (as other analog television formats do, such as composite video).

Audio and Scrambling (selective access)

• Audio, in a format similar to NICAM was transmitted digitally rather than as an FM subcarrier.
• The MAC standard included a standard scrambling system, EuroCrypt, a precursor to the standard DVB-CSA encryption system.

See Also

Weblinks

• Multiplexed Analogue Components in "Analog TV Broadcast Systems" by Paul Schlyter

TV transmission systems

• Analog_high-definition_television_systems
• PAL, what MAC technolgy tried to replace
• SECAM, what MAC technolgy tried to replace
• DVB-S, MAC technolgy was replaced by this standard
• DVB-T, MAC technolgy was replaced by this standard

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