A-MAC

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

Technical details

MAC transmits luminance and chrominance data separately in time rather than separately in frequency.
Audio and Scrambling

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.
TV transmission systems
Analog high-definition television systems
PAL, what MAC technology tried to replace
SECAM, what MAC technology 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 technology was replaced by this standard
DVB-T, MAC technology was replaced by this standard

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