System for transmitting digital information and maintaining a minimum paulse density
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United States of America Patent
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-
Dec 8, 1987
Grant Date -
N/A
app pub date -
Dec 20, 1985
filing date -
Dec 20, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A system having an encoder and a decoder for transmitting ordered data blocks therebetween and for maintaining a minimum pulse density without increasing the bit error rate (BER). The encoder detects critical word having zeros in all bit positions except the least significant bit (LSB) position, constrains the LSB in a critical word having a zero in the LSB position from zero to one to maintain the minimum pulse density, generates an LSB word with each bit in LSB word representing non-constrained LSBs of the critical words in the data block and with the positions of bits in the LSB word corresponding to the order of transmission of the critical words in the data block. The decoder receives the LBS word and data block and converts the constrained LSB according to the indication of the respective bit in LSB word to reduce the BER.
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