| 摘要(英) |
Nowadays the popular technology of optical recording system is “DVD”, which is light and slim in shape as its advantage and is convenient for carrying. As and the demands for high-quality audio and video, the conventional soft disk and tape had been replaced and raised the storage capacity of recording system. The optical recording system such as CD、DVD, which consist in Focus and Track signal located in the part of low frequency, while in order to read this signal and that wasn’t interfered from the low frequency part of information, so you must lower the content of information in low frequency and achieve the demand for DC-free. The paper is discussed in this way.
The paper is organized as two sections. In Section 1, the combination of partial response signal and Maximum Likelihood Detection (PRML) is introduced first and develop the TMTR code. After solving the problem of codeword combination, the method of replaced codeword partially is used and the running digital sum within the limited range to achieve the demand for DC-free. When in variety of k value the number of the replaced codewords are also different. We analyzed and compared the difference conditions in PSD.
In Section 2, the method proposed by B. Vasic and K. Pedagani is introduced first. The idea is to completely eliminate a constrained code and, instead, impose the constraint by the deliberate introduction of bit errors before transmission. Finally the decoder proposed by S. Babvey and S. W. McLaughlin is used and improved further and applied in optical recording system, so the demand for DC-free is achieved. |
| 參考文獻 |
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