Claims
- 1. An apparatus for reading a rotating constant linear velocity (CLV) disk, the CLV disk having primary information prerecorded together with clock data all along a multiturn spiral track thereon, the apparatus comprising:
- (a) drive means for driving the CLV disk at a constant angular velocity (CAV) so as to read at CAV throughout the length of the multiturn spiral track;
- (b) a transducer movable along the track on the rotating CLV disk for reading the prerecorded primary information and clock data;
- (c) a first clock connected to the transducer for producing a first clock signal derived from the clock data read on the CLV disk, the first clock signal varying in frequency in step with a varying rate of the clock data being read on the CLV disk being driven at CAV;
- (d) a second clock for producing a second clock signal having a constant frequency; and
- (e) a memory connected to the transducer and to the first and the second clocks for storing the recovered primary information while being clocked by the first clock signal and for putting out the recovered primary information while being clocked by the second clock signal.
- 2. The apparatus of claim 1 further comprising a demodulator circuit connected to the transducer and to the first clock for demodulating the recovered primary information while being clocked by the first clock signal.
- 3. The apparatus of claim 1 wherein the first clock comprises:
- (a) a voltage controlled oscillator for producing the first clock signal; and
- (b) phase comparator means having inputs connected to the voltage controlled oscillator and to the transducer and an output connected to the voltage controlled oscillator for producing a signal representative of a phase difference between the first clock signal and an output from the transducer.
- 4. The apparatus of claim 3 further comprising:
- (a) control means connected to the transducer for generating transducer position signals indicative of approximate transducer positions in a radial direction of the CLV disk; and
- (b) means included in the voltage controlled oscillator of the first clock and connected to the control means for varying a central frequency of oscillations of the voltage controlled oscillator according to the radial position of the transducer on the CLV disk.
Priority Claims (1)
Number |
Date |
Country |
Kind |
3-208675 |
Jul 1991 |
JPX |
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Parent Case Info
This is a continuation of application Ser. No. 07/919,716, filed Jul. 24, 1992, now abandoned.
US Referenced Citations (5)
Continuations (1)
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Number |
Date |
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Parent |
919716 |
Jul 1992 |
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