Record carrier and apparatus for scanning the record carrier

摘要

A record carrier has a servo track indicating an information track intended for recording information blocks. The servo track has a variation of a physical parameter, referred to as wobble. The wobble is modulated for encoding record carrier information, such as addresses. The servo track is subdivided in modulated parts in which the frequency and/or phase of the variation deviates from the wobble frequency, and non-modulated parts. The slope of the wobble is substantially continuous at transitions between the modulated and non-modulated parts by using wobbles starting at the maxima or minima of the wobble in a first part of the modulated parts.

主权项

1. A device for manufacturing a record carrier, the device configured to:
provide a record carrier with a servo track indicating an information track intended for recording information blocks; provide a servo track with a variation of a physical parameter at a predetermined frequency; modulate the variation for encoding record carrier information; and provide the servo track with:
non-modulated parts having only the variation at a predetermined frequency, andmodulated parts in which the frequency and/or phase of the variation deviates from the frequency and/or phase of the non-modulated parts for representing data bits of the record carrier information; and wherein the modulated parts comprise at least one variation of a phase that is inverse to the phase of the non-modulated periodic variations, and the data bits always start at a maximum or minimum amplitude of the variation of the physical parameter.