MDCP: Patent Abstact US04907216: Optical record carrier having position indentifying track modulation

US04907216 Optical record carrier having position indentifying track modulation

Assignee U.S. Philips Corporation

Assign./Filed March 6, 1990/ Dec. 9, 1987

Inventors Rijnsburger; Johan M.

Summary Method for storing address information in a recordable disc's pregroove. Different from MDs modulated ADIP wobble however.

Abstract A system for recording and/or reading an information signal (Vi) on an elongated track (4) of an optically readable record carrier (1). A position-identifying signal (Vp) which is synchronous with a clock signal is recorded on the track 4 by modulating the transverse excursion of the track, the signal Vp indicating the instantaneous position along the track at which the information signal Vi is located. The frequency band of the position-identifying signal Vp is situated substantially outside the frequency band of the information signal Vi. In manufacturing such a record carrier, the deflection of a recording beam of radiation in a direction substantially transverse to the track is modulated by the position-information signal Vp.

US04907216	Optical record carrier having position indentifying track modulation
Assignee	U.S. Philips Corporation
Assign./Filed	March 6, 1990/ Dec. 9, 1987
Inventors	Rijnsburger; Johan M.
Summary	Method for storing address information in a recordable disc's pregroove. Different from MDs modulated ADIP wobble however.
Abstract	A system for recording and/or reading an information signal (V<SUB>i</SUB>) on an elongated track (4) of an optically readable record carrier (1). A position-identifying signal (V<SUB>p</SUB>) which is synchronous with a clock signal is recorded on the track 4 by modulating the transverse excursion of the track, the signal V<SUB>p</SUB> indicating the instantaneous position along the track at which the information signal V<SUB>i</SUB> is located. The frequency band of the position-identifying signal V<SUB>p</SUB> is situated substantially outside the frequency band of the information signal V<SUB>i</SUB>. In manufacturing such a record carrier, the deflection of a recording beam of radiation in a direction substantially transverse to the track is modulated by the position-information signal V<SUB>p</SUB>.