Range length limited encodig input method for photocoloring multiple gradient optical memory |
Title： |
| Range length limited encodig input method for photocoloring multiple gradient optical memory |
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Application Number： |
200310121702 |
Application Date： |
2003/12/19 |
Announcement Date： |
2004/12/08 |
Pub. Date： |
2007/03/14 |
Publication Number： |
1553450 |
Announcement Number： |
1305064 |
Grant Date： |
2007-3-14 |
Granted Pub. Date： |
2007-3-14 |
ApplicationType： |
Invention |
State/Country： |
11[China|beijing] |
IPC： |
G11B 20/10G11B 7/00H03M 7/46 |
Applicant(s)： |
Tsinghua Univ. |
Inventor(s)： |
Xu Duanyi, Hu Hua, Qi Guosheng |
Key Words： |
Range length, input method, photocoloring, multiple gradient, optical memory |
Abstract： |
Encoder built from field programmable gate array (FPGA) is adopted in the invention. Based on method of dividing and uniting states of finite state diagram, users' data in 3 bits are mapped into 8 orders channel data in 2 bits. The mapping relation is solidified in ROM of encoder. Once users' data are inputted into encoder, the said data enter into data buffer first. Then, each group in 3 bits entering into ROM is mapped to channel sequence. Code rate of encoder is R=3/2. Encoded character sequence includes characters '0', '1', '2', '3', '4', '5', '6', and '7'. There are at least one piece of zero and most two zeros. Advantages of the invention are: easy implementing encoder/decoder, high coding efficiency, and high density of code. The phototropy multiorder optical storage by using invented method obtains capacity and transmission rate in 2-3 times of capacity and rate in existed method. |
Claim： |
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Priority： |
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PCT： |
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LegalStatus： |
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