Frequency modulation to biphase data conversion for writable CD

Details Frequency modulation to biphase data conversion for writable CD Frequency modulation to biphase data conversion for writable CD

1994-12-20

1996-04-09

Epps, Georgia Y.

Dynamic information storage or retrieval

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

Mechanism control by the control signal

369 50, 369 54, 369 59, 369124, G11B 700

Patent

active

055068243

ABSTRACT:
A method for detecting and processing ATIP information extracted from a prerecorded wobbled groove formed in a compact disk is disclosed. The prerecorded wobbled groove has a plurality of blocks of information. The method includes extracting an FM signal from the wobbled groove and providing a high frequency phase-lock loop which responds to the extracted FM signal to produce a high frequency clock. The method further includes converting such FM signal into biphase data by sampling and latching the FM ATIP signal from the wobbled groove; and digitally comparing a predetermined count value to a count value derived from the high frequency clock and the FM signal. It further includes extracting a clock signal from a digital phase-lock loop responsive to the biphase data; and providing an ATIP decoder which in response to the biphase data, biphase clock, and high frequency clock signal provides sync detection and address information.

REFERENCES:
patent: 5341356 (1994-08-01), Dieleman et al.
patent: 5363360 (1994-11-01), Fairchild

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