Industrial Technology Research Institute

Che-Kuo Hsu

Yung-Chi Yang

Chang-Po Ma

Tzuan-Ren Jeng

Kuo-Hsin Lai

Feng-Hsiang Lo

Kuo-Chi Chiu

Sheng-Li Chang

Jung-Po Chen

Ji-Wen Kuo

Ming-Chang Tsai

Sun-How Jiang

An optical recoding carrier and an information recording method applying an amplitude shift keying (ASK) method or further a DC-biased ASK method are provided, wherein at least one periodically undulated section and at least one non-periodically undulated section are formed on the optical recording carrier to indicate specific information. The information recording method can be embodied as an addressing method of an optical disk for recording address information of tracks of the optical disk. A continuous track structure is provided on the optical recording carrier to save the available recording space and improve the information reading precision of the optical recording carrier. Furthermore, a signal generating apparatus and an information reading apparatus applied in the information recording method are provided.

Optical recording carrier, signal generating apparatus, information recording method, and information reading apparatus

A type dependency modulation method with type control is integrated with type control code words in traditional type dependency modulation. It increases the effect of DC component control in the overall encoding procedure. In this method, a specific type-control code word is inserted at certain intervals in the encoding procedure, increasing the selectable code words in subsequent encoding procedures, thereby improving the DC component control ability.

Type dependency modulation method with type control

A data encoding method for error correction is provided. Before recording data into a recording media, the data are added with an Error Correction Code (ECC) comprising Check Sum on Row (CSR) and Check Sum on Column (CSC), thereby forming an ECC block. More than one ECC block are integrated into a data matrix, to resist longer burst errors of data. Finally, the data matrix is divided into several sectors and individual sector address information is added for each sector, thereby finishing the encoding process.

Data encoding method for error correction

Disclosed are a method and device of converting data words into code words. This method inserts 2p guided bits before inputting each set of data words, performs a pre-defined operation, and generates 2data sequences with different guided bits. It chooses q data sequences from the 2data sequences for coding, performs a run length limited (RLL) coding with a coding rate m/n, and generates q (d, k) constrained code word sequences. Finally, an optimal (d, k) constrained code word sequence is selected from the q (d, k) constrained code word sequences. The device reduces the circuitry of the RLL coding applied guided scrambling without losing the control of direct current and low frequency components.

Method and device of converting data words into code words

A state modulation method and an apparatus for inserting state control codes are provided. To overcome the problems of inefficient control on direct current and low frequency component in conventional state modulation techniques, the disclosed method inserts state control codes in a state modulation method to increase the probability for selection. With multi-level characteristics, the inserted state control codes can provide a plurality of sets of different signals for selection during coding. Thereby, the direct current and low frequency components can be well controlled.

State modulation method and apparatus for inserting state control codes

A fast look-ahead path modulation apparatus, used in a recording medium modulation apparatus, reduces computation time during its look-ahead path modulation procedure. It is based on different selection criteria of predetermined states, paths and characteristics of modulation. Accordingly, the apparatus drastically reduces the amount of computation in a regular look-ahead path modulation apparatus. It also reduces hardware costs of the recording medium modulation apparatus and increases efficiency.

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Hsinchu, Taiwan

Che-Kuo Hsu