Abstract: An apparatus for generating push-pull signals is disclosed. The apparatus, used in an optical-disk apparatus, includes a first signal-adjusting circuit, a second signal-adjusting circuit, gain-determining means, and a difference-signal generating circuit.

Abstract: A writing method for an optical disc to optimize a writing speed, wherein a spiral track on the optical disc is divided into a plurality of zones, and different CLV writing speeds are used for performing a ZCLV writing to the zones respectively. The writing method comprises steps of: setting a plurality of writing modes; storing a plurality of zone parameter sets for the writing modes respectively in a memory, wherein each of the zone parameter sets comprises dividing times for dividing the zones, and the different CLV writing speeds for the zone respectively; determining a disc type of the optical disc by a disc type determining device before the ZCLV writing is performed; selecting one of the zone parameter sets that is suitable to the disc type of the optical disc; and performing the ZCLV writing with the writing mode corresponding to the selected zone parameter set.

Abstract: A writing method for an optical disc to optimize a writing speed, wherein a spiral track on the optical disc is divided into a plurality of zones, and different CLV writing speeds are used for performing a ZCLV writing to the zones respectively. The writing method comprises steps of: setting a plurality of writing modes; storing a plurality of zone parameter sets for the writing modes respectively in a memory, wherein each of the zone parameter sets comprises dividing times for dividing the zones, and the different CLV writing speeds for the zone respectively; determining a disc type of the optical disc by a disc type determining device before the ZCLV writing is performed; selecting one of the zone parameter sets that is suitable to the disc type of the optical disc; and performing the ZCLV writing with the writing mode corresponding to the selected zone parameter set.

Abstract: In order to demodulate a wobble signal, obtained from reflected light reflected from a recording surface of an optical disk having a wobbling track produced thereon, including a carrier wave part having a predetermined basic frequency and a phase modulation wave part having predetermined information added thereto, the wobble signal including a frequency component at least exceeding ? of the basic frequency is extracted; and phase demodulation of the phase modulation wave part is carried out based on a thus-extracted frequency component and a clock signal generated from the carrier wave part.

Abstract: An apparatus for generating push-pull signals is disclosed. The apparatus, used in an optical-disk apparatus, includes a first signal-adjusting circuit, a second signal-adjusting circuit, gain-determining means, and a difference-signal generating circuit.

Abstract: A writing method for an optical disc to optimize a writing speed, wherein a spiral track on the optical disc is divided into a plurality of zones, and different CLV writing speeds are used for performing a ZCLV writing to the zones respectively. The writing method comprises steps of: setting a plurality of writing modes; storing a plurality of zone parameter sets for the writing modes respectively in a memory, wherein each of the zone parameter sets comprises dividing times for dividing the zones, and the different CLV writing speeds for the zone respectively; determining a disc type of the optical disc by a disc type determining device before the ZCLV writing is performed; selecting one of the zone parameter sets that is suitable to the disc type of the optical disc; and performing the ZCLV writing with the writing mode corresponding to the selected zone parameter set.