Method of dc-free 8/9 nrz coding using a unique sync word patter

Details Method of dc-free 8/9 nrz coding using a unique sync word patter Method of dc-free 8/9 nrz coding using a unique sync word patter

1987-04-06

1988-10-04

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

360 40, 375106, 341 95, H04B 1404

Patent

active

047759852

ABSTRACT:
An 8/9 encoding scheme wherein the improvement comprises selectively outputting, in response to a sync control signal, a first and a second 9 bit code word that uniquely identify a synchronization point in the 9 bit data word stream. The first code word is 1 1111 1111.sub.2 (1FF.sub.16) if the digital sum variation (DVS) is less than zero and 0 0000 0000.sub.2 (000.sub.16) if the digital sum variation is greater than or equal to zero. The second code word is any .+-.1 CDS entry of the same CDS polarity as the first word. In a preferred embodiment of the invention, the second code word is 1 0101 0101.sub.2 or 155.sub.16 (CDS=+1) or 0 1010 1010.sub.2 or 0AA.sub.16 (CDS=-1).

REFERENCES:
patent: 4027335 (1977-05-01), Miller
patent: 4364081 (1982-12-01), Hashimoto et al.
patent: 4499454 (1985-02-01), Shimada
patent: 4501000 (1985-02-01), Immink et al.
patent: 4517552 (1985-05-01), Shirota et al.
patent: 4520346 (1985-05-01), Shimada
patent: 4531153 (1985-07-01), Watanabe
patent: 4547890 (1985-10-01), Gindi
patent: 4577180 (1986-03-01), Fukuda
patent: 4620311 (1986-10-01), Schouhamer Immink
patent: 4626826 (1986-12-01), Fukuda et al.
patent: 4698809 (1987-10-01), Munter
Article Entitled 8-9 Block Code a DC-Free Channel Code for Digital Magnetic Recording, by Hirofumi Yoshida, Toshiyuki Shimada, and Yoshitaka Hshimoto, in SMPTE Journal, Sep. 1983.
Duc, "Line Coding Techniques for Baseband Digital Transmission", ATR, vol. 9, No. 1, 1975.

Affiliated with

Also associated with

Rating

Method of dc-free 8/9 nrz coding using a unique sync word patter does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of dc-free 8/9 nrz coding using a unique sync word patter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of dc-free 8/9 nrz coding using a unique sync word patter will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2159691