Adaptive writing method for high-density optical recording apparatus and circuit thereof

An adaptive writing method comprising:

• selecting one of grouping tables grouped by the magnitudes of marks and spaces of input data, using grouping pointers;
• calculating a width of a write pulse using data stored in the selected grouping table;
• and
• writing the input data using an adaptive write pulse generated in response to the calculated width on an optical recording medium.

An adaptive writing method of writing input data on an optical recording medium using a write pulse waveform including a first pulse, a last pulse and a multi-pulse train, to optimize a light power of a light source, the adaptive writing method comprising:

• discriminating between magnitudes of a present mark of the input data and leading and/or trailing spaces of the present mark;
• generating pulse width data for varying widths of the first and/or last pulses of the write pulse waveform in accordance with the magnitude of the present mark and the magnitudes of the leading and/or trailing spaces, based on a grouping table storing width data of the first and/or last pulses of the write pulse waveform providing in a grouping table stored in a memory;
• and
• generating an adaptive write pulse in accordance with the pulse width data, and converting the adaptive write pulse into a current signal in accordance with driving power levels for respective channels for the adaptive write pulse to drive the light source.

An adaptive write pulse generating method, the adaptive write pulse being used to write input data to an optical recording medium, comprising:

• inputting a write pulse including a first pulse, a last pulse and a multi-pulse train;
• generating the adaptive write pulse by varying a falling edge of the first pulse in accordance with a magnitude of a leading space and a magnitude of a present mark, and varying a falling edge of the second pulse in accordance with a magnitude of a trailing space and the magnitude of the present mark, based on width data of the first and last pulses of the input write pulse provided in a grouping table stored in a memory;
• and
• outputting the generated adaptive write pulse.