Pulse or digital communications – Pulse code modulation – Length coding
Patent
1997-11-13
2000-09-05
Pham, Chi H.
Pulse or digital communications
Pulse code modulation
Length coding
375242, H04B 1404
Patent
active
061154253
ABSTRACT:
In order to transmit variable length coded data blocks while reducing data loses caused by code errors, the control circuit 7 makes a group of a plurality of variable length coded data, a fixing length circuit 9 fixes the code length of each of the variable length coded data thus grouped so that the data blocks each have an average code length and then makes a group of the data blocks in that condition, a header outputting circuit 8 prepares a header including information on the grouped data blocks and a synchronization word, and a control circuit 7 controls a switch SWC so that the prepared header and the group of data blocks are output through an output terminal 2. On the decoding side, the data blocks are synchronized/decoded by obtaining the code length of the group of data blocks and the number of the data blocks with reference to the location of the synchronization word in the header and information on the data blocks.
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Adachi Satoru
Ohya Tomoyuki
NTT Mobile Communications Networks Inc.
Pham Chi H.
Tran Khai
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