Frame format for video codec

Details Frame format for video codec Frame format for video codec

1987-07-06

1989-12-19

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370112, H04J 322

Patent

active

048887684

ABSTRACT:
A frame format for a video codec combines video data at a video subcarrier frequency with up to five data channels at a DS1 digital telecommunications data rate and an optional audio/telephone channel. Video data is sampled and input to a stuff FIFO at the subcarrier frequency rate and output to a multiplexer at a DS3 digital telecommunications data rate. A stuff word is generated for each DS3 data subframe and contains either a valid data bit or a garbage data bit, as indicated by a stuff flag contained in the stuff word, to compensate for the difference in input and output data rates from the stuff FIFO. The DS3 master frame generated by a multiplexer from the video data and the other data channels is transmitted and decoded at the receiving end in a reverse manner.

REFERENCES:
patent: 4538286 (1985-08-01), McNesby et al.
patent: 4553129 (1985-11-01), McNesby et al.
patent: 4558445 (1985-12-01), Novick
patent: 4649536 (1987-03-01), Krinock
patent: 4661966 (1987-04-01), Schreiner

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