Write a short note on synchronization in MAC

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written 6.7 years ago by

teamques10 ★ 68k

For digital sound transmission the phase modulation of binary and quadrature PSK of C-MAC was initially considered but rejected because it would have required a clock rate of about 12 MHz.
Duo-binary coding of sound signal developed in France to reduce the bandwidth requirement for the data burst.
Every two adjacent bits of Level 0 and 1 are combined into a new information unit, giving rise to a possible pairing as 00, 11 as well as 10 and 01, because 10 and 01 are treated as same, 3 possible patterns left.
Synchronization in MAC signal can be of two types namely horizontal and vertical.
Horizontal synchronization can be achieved with the help of first 6 bit of the database whereas vertical synchronization can be achieved with the help of first 64 bits vertical sync and the word send in the 625th line.
The horizontal sync word is defined as “001011”. It is transmitted either and its true form or anyone inverted form depending on the horizontal line number.
The sound and data information is transmitted in the form of packets. The first bit starts with the first bit of following horizontal sync word of the first line.

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