Phase-synchronous controller for production of reference clock s

Details Phase-synchronous controller for production of reference clock s Phase-synchronous controller for production of reference clock s

1990-09-28

1992-12-15

Weinhardt, Robert

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369124, 360 361, 358337, 331 25, G11B 700

Patent

active

051723573

ABSTRACT:
A phase-lock control circuit suitable for an optical disk apparatus of a sample-servo format scheme includes an injection-synchronized control loop in addition to a normal phase-lock loop control loop. The phase-lock loop control loop includes a phase-comparator, a low-pass filter, a voltage-controlled oscillator, i.e., a VCO, a frequency-dividing counter, and a decoder. The phase-comparator detects a phase difference between a clock pit pulse signal and a feedback pulse signal supplied through the frequency-dividing counter and the decoder. The VCO is oscillated to compensate for the phase difference and generates a reference clock signal. A time-base filter and an injection pulse generator are provided for the VCO to constitute the injection-synchronized control loop, wherein at least one injection pulse having a pulse width substantially equal to the non-response period of the comparator is intermittently generated in response to the reference clock signal upon completion of a comparison operation by the comparator, and the injection pulse is supplied to the VCO. The VCO is of an injection-synchronized voltage-controlled type.

REFERENCES:
patent: 4347484 (1982-08-01), Vandegraaf
patent: 4651231 (1987-03-01), Douglas, Jr.
patent: 4688003 (1987-08-01), Stromsworld
patent: 4768103 (1988-08-01), Nakamura et al.
A High Definition Muse VCR With Analog Segment Recording Method Takashi Furuhata et al., Jan. 31, 1986 pp. 107-115.
Clock Jitter in Sampled Servo Format Takashi Takeuchi et al. pp. 137-140.

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