摘要:
An adaptive writing method for a high-density optical recording apparatus and a circuit thereof are provided. The circuit includes a discriminator (102) for discriminating the magnitude of the present mark of the input data and the magnitudes of the leading and/or trailing spaces, a generator (104,108) for controlling the waveform of the write pulse in accordance with the magnitude of the present mark of the input data and the magnitudes of the leading and/or trailing spaces to generate an adaptive write pulse, and a driver (110) for driving the light source by converting the adaptive write pulse into a current signal in accordance with driving power levels for the respective channels. The widths of the first and/or last pulses of a write pulse waveform are varied in accordance with the magnitude of the present mark of input NRZI data and the magnitude of the leading and/or trailing spaces, thereby minimizing jitter to enhance system reliability and performance.
摘要:
An apparatus for recording data on an optical recording medium (200), the apparatus comprising: a recording waveform generator (2) for generating a recording waveform having an erase pattern (F) including a multi-pulse; and a pickup unit (1) for radiating light onto the optical recording medium (200) according to the generated recording waveform to form a mark or a space.
摘要:
A method and apparatus for recording data on an optical recording medium (200) are provided. In the method of recording data on the optical recording medium, a mark or a space is formed using a recording waveform having an erase pattern including a predetermined pulse whose high level is higher than an erase power level and whose low level is lower than the erase power level. Thus, the shape of the mark can be prevented from being distorted and be improved, which results in an improvement in the recording/reproducing characteristics.
摘要:
An adaptive writing method for a high-density optical recording apparatus and a circuit thereof are provided. The circuit includes a discriminator (102) for discriminating the magnitude of the present mark of the input data and the magnitudes of the leading and/or trailing spaces, a generator (104,108) for controlling the waveform of the write pulse in accordance with the magnitude of the present mark of the input data and the magnitudes of the leading and/or trailing spaces to generate an adaptive write pulse, and a driver (110) for driving the light source by converting the adaptive write pulse into a current signal in accordance with driving power levels for the respective channels. The widths of the first and/or last pulses of a write pulse waveform are varied in accordance with the magnitude of the present mark of input NRZI data and the magnitude of the leading and/or trailing spaces, thereby minimizing jitter to enhance system reliability and performance.
摘要:
An apparatus for recording data on an optical recording medium (200), the apparatus comprising: a recording waveform generator (2) for generating a recording waveform having an erase pattern (F) including a multi-pulse; and a pickup unit (1) for radiating light onto the optical recording medium (200) according to the generated recording waveform to form a mark or a space.
摘要:
A disc having grooves (10) and pits (15,16) with different depths, and a easy method for manufacturing the same are provided. The disc satisfies the conditions: λ/ 8n ≤ d 3 ≤ λ / 5n where d 3 is a difference in depths between the grooves (10) and the pits (5,16), λ is the wavelength of a light source, and n is the refractive index of the disc. The disc manufacturing method involves depositing photoresist over a glass master. A master is manufactured by forming a first land region and a second land region having different depths by laser cutting with laser beams having different power levels, and by developing the glass master from the cutting of laser. Following this, a father stamper having a groove region and a pit region is stamped from the master, the groove region and the pit region of the father stamper being inverse to those of the master, and then a mother stamper is stamped from the father stamper, the shape of the mother stamper being inverse to the shape of the father stamper. The mother stamper is used to manufacture a disc by injection molding. Reproduction-only pits for DVD-RW can be simply formed without need for etching processes.
摘要:
An adaptive writing method for a high-density optical recording apparatus and a circuit thereof are provided. The circuit includes a discriminator (102) for discriminating the magnitude of the present mark of the input data and the magnitudes of the leading and/or trailing spaces, a generator (104,108) for controlling the waveform of the write pulse in accordance with the magnitude of the present mark of the input data and the magnitudes of the leading and/or trailing spaces to generate an adaptive write pulse, and a driver (110) for driving the light source by converting the adaptive write pulse into a current signal in accordance with driving power levels for the respective channels. The widths of the first and/or last pulses of a write pulse waveform are varied in accordance with the magnitude of the present mark of input NRZI data and the magnitude of the leading and/or trailing spaces, thereby minimizing jitter to enhance system reliability and performance.
摘要:
An optical storage medium comprising: a lead-in area, which comprises a read only area and a readable/recordable area; a user data area in which user data is recorded; a first wobble formed in the read only area of the lead-in area; and a second wobble formed in the readable/recordable area of the lead-in area; wherein the user data is transferred with respect to the user data, the first wobble is modulated by a first modulation method and the second wobble is modulated by a second modulation method different to the first modulation method and the second modulation method comprises a minimum shift keying (MSK) modulation method and a saw tooth wobble (STW) modulation method, and further an apparatus for transferring data with respect to an optical storage medium comprising a lead-in area, which comprises a read only area and a readable/recordable area, and a user data area in which user data is recorded, the apparatus comprising: an optical pickup to emit light to transfer data on the storage medium; and a controller arranged to control the optical pickup to record data on the user data area, wherein user data is transferred with respect to the user data area, first data with respect to a first wobble formed in the read only area of the lead-in area is transferred, second data with respect to the readable/recordable area, in which a second wobble is formed of the lead-in area is transferred, the first wobble is modulated by a first modulation method and the second wobble is modulated by a second modulation method different to the first modulation method and the second modulation method comprises a minimum shift keying (MSK) modulation method and a saw tooth wobble (STW) modulation method.