A-MAC
From Wikipedia, the free encyclopedia
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.
[edit] 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.
[edit] 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
- A-MAC
- B-MAC
- C-MAC
- D-MAC
- E-MAC
- S-MAC
- D2-MAC
- HD-MAC, an early high-definition television standard allowing for 2048x1152 resolution.
- DVB-S, MAC technolgy was replaced by this standard
- DVB-T, MAC technolgy was replaced by this standard
