Multi-mode dynamic code assignment for data compression

Details Multi-mode dynamic code assignment for data compression Multi-mode dynamic code assignment for data compression

1987-08-24

1989-01-17

Safourek, Benedict V.

Pulse or digital communications

Spread spectrum

Direct sequence

360 40, 375 27, 381 31, H04B 1406

Patent

active

047992425

ABSTRACT:
Bit-serial compression process improved by inclusion of character-repeat (character) mode. During the compression process in a bit serial (bit) mode, using a predictive scheme with code words for each predicted bit, the characters, typically bytes (eight bits), are assembled bit by bit. Each assembled character is compared to the preceding character. When two successive identical characters occur, the process changes to the repeat-character mode wherein successive identical characters are signaled in the same manner as correctly predicted bits. When a different character occurs, the process signals in a manner corresponding to an incorrectly predicted bit. Provisions are made for limitations imposed by finite code spaces, for supplying a data bit when recording a code word associated with an exhausted code space or different characted, and for indicating an identical character has occurred when recording a code word associated with an exhausted code space.

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patent: 4591829 (1986-05-01), Takeda
patent: 4608652 (1986-08-01), Yokokawa et al.
patent: 4633490 (1986-12-01), Goertzel et al.
patent: 4646148 (1987-02-01), Lienard et al.
patent: 4648119 (1987-03-01), Wingfield et al.

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