PLL Control circuit for recovery of data from audio disk

Details PLL Control circuit for recovery of data from audio disk PLL Control circuit for recovery of data from audio disk

1982-09-29

1985-01-22

LaRoche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

331 17, 369 59, H03L 710

Patent

active

044954743

ABSTRACT:
A phase locked loop control circuit for a digital audio disk system is disclosed which has a voltage-controlled oscillator (VCO), a reference signal generator for generating a reference signal corresponding to the phase state of a digital audio signal when the digital audio signal is reproduced or read out and which is recorded on a digital audio disk (DAD) to have a maximum or minimum inverting period value predetermined by the eight to fourteen modulation method, a phase comparator connected to the output terminal of the reference signal generator and the VCO, a detector for detecting the maximum inverting period value included in the digital audio signal; and an adder for adding outputs from the phase comparator and the detector and for supplying a sum result as an oscillation control signal to the VCO.

REFERENCES:
patent: 4338683 (1982-07-01), Furukawa et al.
patent: 4397011 (1983-08-01), Ogawa
patent: 4439849 (1984-03-01), Nabeshima

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