US Patent No: 4,691,193

Number of patents in Portfolio can not be more than 2000

Methods and apparatus for encoding and decoding data to and from a (2,7) format

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ATTORNEY / AGENT: (SPONSORED)
 

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Abstract

Methods are set forth for constructing encoding and decoding state machines for preselected variable length fixed rate (2,7) codes. These state machines convert a variable length code to a state dependent fixed length fixed rate (2,7) code. Methods and apparatus are also disclosed for implementing a state dependent fixed length fixed rate (2,7) coding scheme in a manner that is simpler and inherently more reliable than the implementation of the corresponding variable length fixed rate (2,7) code. In addition, the disclosed methods and apparatus for implementing the state dependent code preserve the error recovery features of a variable length fixed rate (2,7) coding scheme.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
ADVANCED MICRO DEVICES, INC.SUNNYVALE, CA5244

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Khu, Arthur H San Mateo, CA 15 199

Cited Art

Patent Info (Count) # Cites Year
 
INTERNATIONAL BUSINESS MACHINES CORPORATION (2)
4,463,344 Method and apparatus for generating a noiseless sliding block code for a (2,7) channel with rate 1/2 37 1981
4,567,464 Fixed rate constrained channel code generating and recovery method and means having spectral nulls for pilot signal insertion 33 1983

Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
OPTEX CORPORATION (16)
5,537,382 Partial response coding for a multi-level optical recording channel 21 1994
5,781,130 M-ary (d,k) runlength limited coding for multi-level data 8 1995
5,757,293 M=8 (1,2) runlength limited code for multi-level data 4 1995
5,748,117 M=8 (1,3) runlength limited code for multi-level data 2 1995
5,748,118 M=7 (3,8) runlength limited code for multi-level data 2 1995
5,682,154 M=4 (1,2) runlength limited code for multi-level data 0 1995
5,682,155 M=6(4,11) runlength limited code for multi-level data 2 1995
5,680,128 M=6(3,8) runlength limited code for multi-level data 0 1995
5,675,330 M=5(4,11)runlength limited code for multi-level data 0 1995
5,670,956 M=5 (3,7) runlength limited code for multi-level data 0 1995
5,668,546 M=6 (3,6) runlength limited code for multi-level data 1 1995
5,663,722 M=10 (3,6) runlength limited code for multi-level data 0 1995
5,663,723 M=7 (1,3) runlength limited code for multi-level data 0 1995
5,659,310 M=5 (0,2) runlength limited code for multi-level data 2 1995
5,659,311 M=6 (2,4) runlength limited code for multi-level data 0 1995
5,657,014 M=7 (3,7) runlength limited code for multi-level data 2 1995
 
CANON KABUSHIKI KAISHA (1)
4,860,324 Information data recovering apparatus 8 1987
 
GPT LIMITED (1)
5,822,385 Fast serial pattern recognition 2 1995
 
LSI LOGIC CORPORATION (1)
6,150,964 M=10 (2,10), D=3.75 runlength limited code for multi-level data 36 1997
 
MAXTOR CORPORATION (1)
5,184,125 Data encoding and demodulation system 1 1991
 
SONY CORPORATION (1)
6,369,724 Modulating apparatus and method, demodulating apparatus and method, and transmission medium 11 1998