Data modulation method, and recording and reproducing apparatuses and methods adopting the data modulation method

An apparatus for demodulating data from a recording medium, wherein a run length of the data is extended by a predetermined length by modulation before writing the data to the recording medium, the apparatus comprising:

• a detection unit which detects the extended run length data;
• an error correction unit which corrects errors from the detected data;
• and
• a decoder which detects the error-corrected data by reducing the run length of the data extended through the modulation by the predetermined length to recover data bits corresponding to data bits before the run length was extended.

An apparatus for recording data including header data and user data in a recording medium, the apparatus comprising:

• a first encoder which encodes the header data by extending a run length of the header data through a first code transformation;
• a second encoder which encodes the user data through a second code transformation;
• a multiplexer which multiplexes the transformed data output from the first and second encoders;
• a format converter which converts the multiplexed data output from the multiplexer into a format suitable for writing to the recording medium;
• and
• a pulse shaping unit which shapes pulses of the data output from the format converter to write the resultant data to the recording medium.

An apparatus for demodulating data read from a recording medium, wherein the data including header and user data is transformed by first and second code transformations, respectively, prior to being written to the recording medium, the data demodulating apparatus comprising:

• a detection unit which detects the data from the recording medium and digitizes the detected data;
• a synchronization detector which detects a sync signal from the header data;
• a first error correction unit which corrects errors from the header data of the digitized data in synchronization with the sync signal detected by the sync detector;
• a first decoder which decodes the error-corrected header data by a first decoding scheme;
• a second decoder which decodes the user data of the digitized data by a second decoding scheme;
• an address decoder which decodes address data of the header data decoded by the first decoder;
• and
• a second error correction unit which corrects errors from the user data decoded by the second decoder.

A method of recording data in a recording medium, the method comprising;

• distinguishing header data from user data;
• coding the header data with run length limited (RLL) codes;
• performing a first code transformation to the header data by extending the run length of the header data coded with run length limited (RLL) codes;
• performing a second code transformation to the user data;
• multiplexing the header data transformed by the first code transformation and the user data transformed by the second code transformation;
• converting the multiplexed data into a predetermined format suitable for writing to the recording medium;
• and
• writing the converted data to the recording medium.

A method of reproducing data written to a recording medium, the method comprising:

• detecting and digitizing the data written to the recording medium;
• converting the digitized data to a predetermined demodulation format;
• classifying the format-converted data into header data and user data;
• correcting errors from the header data;
• decoding the error-corrected header data by a first decoding scheme;
• restoring address data from the decoded header data;
• decoding the user data by a second decoding scheme;
• and
• correcting errors from the decoded user data.

A method of recording header data and user data on a recording medium, the method comprising:

• expanding binary “1”s of the header data to “010” and binary “0”s of the header data to “000”;
• multiplexing the expanded header data and the user data;
• and
• writing the multiplexed data to the recording medium.

An apparatus for recording original digitized data onto a recording medium and for reproducing data corresponding to the original digitized data from the recording medium, the apparatus comprising;

• a space extending encoder which performs a first code transformation to space-extend a run length of the original digitized data to a predetermined length;
• a multiplexer which multiplexes the space-extended data and additional data transformed by a predetermined second code transformation;
• a format converter which converts the multiplexed data into a predetermined format which is suitable for writing to the recording medium;
• a detection unit which detects the extended run length data from the recording medium;
• an error correction unit which corrects errors from the detected data;
• and
• a decoder which detects the error-corrected data by reducing the run length of the data to recover data bits corresponding to the original digitized data.

A recording disc, comprising:

• a recording area comprising:
• recorded header data, wherein each binary “1” of the header data are written as “010” and each binary “0” of the header data are written as “000”;
• and
• additional data, wherein each binary “1” of the additional data is written as “1” and each binary “0” of the additional data is written as “0.”