Method of consecutive writing on recordable disc

An apparatus capable of writing new information subsequently to an end of previous information written in a track of a record medium embedded with a pre-recorded signal along the track, the apparatus comprising:

• a phase-locked poop circuit that generates a read clock for reading of the previous information and a write clock for writing of the new information;
• and
• a control circuit that controls the phase-locked poop circuit to effect smooth continuation from the previous information to the new information, wherein
• the phase-locked poop circuit comprises a VCO that oscillates to generate an oscillating clock, a first phase comparator for comparing a phase of a read signal derived from the previous information with a phase of a clock signal derived from the oscillating clock so as to control the VCO based on phase-comparison between the read signal and the clock signal to thereby constitute a first loop of generating the read clock phase-locked to the read signal, a second phase comparator for comparing a phase of a synchronization signal derived from the pre-recorded signal with a phase of a clock signal derived from the oscillating clock so as to control the VCO based on phase-comparison between the synchronization signal and the clock signal to thereby constitute a second loop of generating the write clock phase-locked to the synchronization signal, the first loop and the second loop being switchable with respect to the VCO while the VCO maintaining the same frequency of the oscillating clock, and wherein
• the control circuit operates before starting the writing of the new information subsequent to the end of the previous information, for controlling the phase-locked poop circuit to activate the first loop to conduct the reading of a part of the previous information including the end thereof in synchronization to the read clock generated by the first loop, and then switching the phase-locked poop circuit to activate the second loop when the reading of the previous information reaches the end so as to conduct the writing of the new information in synchronization to the write clock generated by the second loop.

An apparatus capable of writing new information subsequently to an end of previous information written in a track of a record medium embedded with a pre-recorded signal along the track, the apparatus comprising:

• a phase-locked poop circuit that generates a read clock for reading of the previous information and a write clock for writing of the new information, the phase-locked poop circuit comprising a VCO that oscillates to generate an oscillating clock, a first phase comparator for comparing a phase of a read signal derived from the previous information with a phase of a clock signal derived from the oscillating clock so as to control the VCO based on phase-comparison between the read signal and the clock signal to thereby constitute a first loop of generating the read clock phase-locked to the read signal, a second phase comparator for comparing a phase of a synchronization signal derived from the pre-recorded signal with a phase of a clock signal derived from the oscillating clock so as to control the VCO based on phase-comparison between the synchronization signal and the clock signal to thereby constitute a second loop of generating the write clock phase-locked to the synchronization signal, the first loop and the second loop being switchable with respect to the VCO while the VCO maintaining the same frequency of the oscillating clock;
• a detecting circuit that detects the phase of each frame of the read signal derived from the previous information;
• a generating circuit that generates a write signal representative of the new information in synchronization to the oscillating clock generated from the VCO;
• and
• a control circuit that operates before starting the writing of the new information subsequent to the end of the previous information for controlling the phase-locked poop circuit to activate the first loop to conduct the reading of a part of the previous information including the end thereof in synchronization to the read clock generated by the first loop, and then operates when the reading of the previous information reaches the end for controlling the generating circuit to generate the write signal in matching with the phase of the last frame of the read signal detected at the end of the previous information to thereby start the writing of the new information in continuation from the end of the previous information and for switching the phase-locked poop circuit to activate the second loop.

An apparatus capable of writing new information subsequently to an end of previous information written in a track of a record medium embedded with a pre-recorded signal along the track, the apparatus comprising:

• a read phase-locked poop circuit that generates a read clock for reading of the previous information, the read phase-locked poop circuit comprising a first VCO that oscillates to generate an oscillating clock, a first phase comparator for comparing a phase of a read signal derived from the previous information with a phase of a clock signal derived from the oscillating clock so as to control the first VCO based on phase-comparison between the read signal and the clock signal to thereby generate the read clock phase-locked to the read signal;
• a write phase-locked poop circuit that generates a write clock for writing of the new information, the write phase-locked poop circuit comprising a second VCO that oscillates to generate an oscillating clock, a second phase comparator for comparing a phase of the read clock generated by the read phase-locked poop circuit with a phase of a clock signal derived from the oscillating clock of the second VCO so as to control the second VCO based on phase-comparison between the read clock and the clock signal to thereby constitute a first loop of synchronizing the oscillating clock of the second VCO with the read clock, and a third phase comparator for comparing a phase of a synchronization signal derived from the pre-recorded signal with a phase of a clock signal derived from the oscillating clock of the second VCO so as to control the second VCO based on phase-comparison between the synchronization signal and the clock signal to thereby constitute a second loop of generating the write clock phase-locked to the synchronization signal, the first loop and the second loop of the write phase-locked poop circuit being switchable with respect to the second VCO while the second VCO maintaining the same frequency of the oscillating clock;
• and
• a control circuit that operates before starting the writing of the new information subsequent to the end of the previous information, for controlling the read phase-locked poop circuit to conduct the reading of a part of the previous information including the end thereof in synchronization to the read clock generated by the read phase-locked poop circuit while controlling the write phase-locked poop circuit to activate the first loop for synchronizing the oscillating clock of the second VCO with the read clock, and then switching the write phase-locked poop circuit to activate the second loop when the reading of the previous information reaches the end so as to conduct the writing of the new information in synchronization to the write clock generated by the second loop of the write phase-locked poop circuit.

An apparatus capable of writing new information subsequently to an end of previous information written in a track of a record medium embedded with a pre-recorded signal along the track, the apparatus comprising:

• a read phase-locked poop circuit that generates a read clock for reading of the previous information, the read phase-locked poop circuit comprising a first VCO that oscillates to generate an oscillating clock, a first phase comparator for comparing a phase of a read signal derived from the previous information with a phase of a clock signal derived from the oscillating clock so as to control the first VCO based on phase-comparison between the read signal and the clock signal to thereby generate the read clock phase-locked to the read signal;
• a write phase-locked poop circuit that generates a write clock for writing of the new information, the write phase-locked poop circuit comprising a second VCO that oscillates to generate an oscillating clock, a second phase comparator for comparing a phase of the read clock generated by the read phase-locked poop circuit with a phase of a clock signal derived from the oscillating clock of the second VCO so as to control the second VCO based on phase-comparison between the read clock and the clock signal to thereby constitute a first loop of synchronizing the oscillating clock of the second VCO with the read clock, and a third phase comparator for comparing a phase of a synchronization signal derived from the pre-recorded signal with a phase of a clock signal derived from the oscillating clock of the second VCO so as to control the second VCO based on phase-comparison between the synchronization signal and the clock signal to thereby constitute a second loop of generating the write clock phase-locked to the synchronization signal, the first loop and the second loop of the write phase-locked poop circuit being switchable with respect to the second VCO while the second VCO maintaining the same frequency of the oscillating clock;
• a detecting circuit that detects the phase of each frame of the read signal derived from the previous information;
• a generating circuit that generates a write signal representative of the new information in synchronization to the oscillating clock generated from the second VCO;
• and
• a control circuit that operates before starting the writing of the new information subsequent to the end of the previous information for controlling the read phase-locked poop circuit to conduct the reading of a part of the previous information including the end thereof in synchronization to the read clock generated by the read phase-locked poop circuit while controlling the write phase-locked poop circuit to activate the first loop for synchronizing the oscillating clock of the second VCO to the read clock, and then operates when the reading of the previous information reaches the end for controlling the generating circuit to generate the write signal in matching with the phase of the last frame of the read signal detected at the end of the previous information to thereby start the writing of the new information in continuation from the end of the previous information and for switching the write phase-locked poop circuit to activate the second loop of generating the write clock.

An apparatus capable of writing new information subsequently to an end of previous information written in a track of a record medium embedded with a pre-recorded signal along the track, the apparatus comprising:

• a read phase-locked poop circuit that generates a read clock for reading of the previous information, the read phase-locked poop circuit comprising a first VCO that oscillates to generate an oscillating clock, a first phase comparator for comparing a phase of a read signal derived from the previous information with a phase of a clock signal derived from the oscillating clock so as to control the first VCO based on phase-comparison between the read signal and the clock signal to thereby generate the read clock phase-locked to the read signal;
• a write phase-locked poop circuit that generates a write clock for writing of the new information, the write phase-locked poop circuit comprising a second VCO that oscillates to generate an oscillating clock, a selector for selecting one of a synchronization signal derived from the pre-recorded signal and a divisional signal frequency-divided from the read clock at the same frequency as the synchronization signal, and a second phase comparator for comparing a phase of the selected one of the synchronization signal and the divisional signal with a phase of a clock signal derived from the oscillating clock of the second VCO so as to control the second VCO based on phase-comparison between the selected signal and the clock signal to thereby generate the write clock phase-locked to the selected signal;
• and
• a control circuit that operates before starting the writing of the new information subsequent to the end of the previous information, for controlling the read phase-locked poop circuit to conduct the reading of a part of the previous information including the end thereof in synchronization to the read clock generated by the read phase-locked poop circuit while controlling the selector of the write phase-locked poop circuit to select the divisional signal of the read clock for synchronizing the oscillating clock of the second VCO with the read clock, and then controlling the selector of the write phase-locked poop circuit to select the synchronization signal when the reading of the previous information reaches the end so as to conduct the writing of the new information in synchronization to the write clock generated by the write phase-locked poop circuit.

An apparatus capable of writing new information subsequently to an end of previous information written in a track of a record medium embedded with a pre-recorded signal along the track, the apparatus comprising:

• a read phase-locked poop circuit that generates a read clock for reading of the previous information, the read phase-locked poop circuit comprising a first VCO that oscillates to generate an oscillating clock, a first phase comparator for comparing a phase of a read signal derived from the previous information with a phase of a clock signal derived from the oscillating clock so as to control the first VCO based on phase-comparison between the read signal and the clock signal to thereby generate the read clock phase-locked to the read signal;
• a write phase-locked poop circuit that generates a write clock for writing of the new information, the write phase-locked poop circuit comprising a second VCO that oscillates to generate an oscillating clock, a selector for selecting one of a synchronization signal derived from the pre-recorded signal and a divisional signal frequency-divided from the read clock at the same frequency as the synchronization signal, and a second phase comparator for comparing a phase of the selected one of the synchronization signal and the divisional signal with a phase of a clock signal derived from the oscillating clock of the second VCO so as to control the second VCO based on phase-comparison between the selected signal and the clock signal to thereby generate the write clock phase-locked to the selected signal;
• a detecting circuit that detects the phase of each frame of the read signal derived from the previous information;
• a generating circuit that generates a write signal representative of the new information in synchronization to the oscillating clock generated from the second VCO;
• and
• a control circuit that operates before starting the writing of the new information subsequent to the end of the previous information for controlling the read phase-locked poop circuit to conduct the reading of a part of the previous information including the end thereof in synchronization to the read clock generated by the read phase-locked poop circuit while controlling the selector of the write phase-locked poop circuit to select the divisional signal of the read clock for synchronizing the oscillating clock of the second VCO with the read clock, and then operates when the reading of the previous information reaches the end for controlling the generating circuit to generate the write signal in matching with the phase of the last frame of the read signal detected at the end of the previous information to thereby start the writing of the new information in continuation from the end of the previous information and then controlling the selector of the write phase-locked poop circuit to select the synchronization signal for synchronization of the write clock.