Facsimile and static presentation processing – Facsimile – Auxiliary signal
Patent
1993-06-07
1995-01-03
Groody, James J.
Facsimile and static presentation processing
Facsimile
Auxiliary signal
3582611, 341 67, H04N 1419
Patent
active
053791169
ABSTRACT:
A coded video signal encoded into a variable length code is packed into a frame called a cell having a predetermined number of fixed bits for transmission through ATM (Asynchronous Transfer Mode) which is subject to cell loss due to the congestion of network nodes or bit errors in cell headers, causing burst errors or synchronization slips in a received video signal. In order to avoid such errors, one idea for a variable length transmission unit is introduced. A transmission unit has a plurality of cells and any coded video signal terminates in the transmission unit; in other words, a coded video signal is not shared by two transmission units. A transmission unit is closed or terminated during packing operation when the number of available bits in a cell under packing operation becomes less than a predetermined first threshold value and when a cell number in the transmission unit reaches a predetermined second threshold value, so that transmission efficiency is improved. The remainder of bit positions not occupied by a coded video signal in the last cell in a transmission unit are filled with idle fill bits. The first threshold value depends upon a cell number in a transmission unit so that the smaller the cell number is, the smaller the first threshold value.
REFERENCES:
patent: 4376933 (1983-03-01), Saran et al.
patent: 4963867 (1990-10-01), Bertrand
"Structured Packing of Coded Video Signals for ATM Networks", Wada et al, VISICOM '91, 4th International Workshop on Packet Video, Aug. 29-30, 1991, pp. A2-1-A2-6.
Takishima Yasuhiro
Wada Masahiro
Cohen Cheryl
Groody James J.
Kokusai Denshin Denwa Co. Ltd.
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