US 7,489,258 B2
Device and method for embedding a secondary signal in a primary data bit stream on an optical disc
Peter Bentvelsen, Eindhoven (Netherlands); Willem Marie Julia Marcel Coene, Eindhoven (Netherlands); and Bart Van Rompaey, Eindhoven (Netherlands)
Assigned to Koninklijke Philips Electronics N.V., Eindhoven (Netherlands)
Appl. No. 11/577,365
PCT Filed Oct. 17, 2005, PCT No. PCT/IB2005/053396
§ 371(c)(1), (2), (4) Date Apr. 17, 2007,
PCT Pub. No. WO2006/043228, PCT Pub. Date Apr. 27, 2006.
Claims priority of application No. 04105194 (EP), filed on Oct. 20, 2004.
Prior Publication US 2008/0122667 A1, May 29, 2008
Int. Cl. H03M 5/00 (2006.01)
U.S. Cl. 341—58  [341/68] 17 Claims
OG exemplary drawing
 
1. Device for embedding a secondary signal of a secondary channel in the primary data bit stream of a primary channel, wherein said primary data bit stream comprises a number of recording frames (12) each starting with a frame sync followed by a number of DC-control blocks each including a number of primary data bits and a DC-control bit and wherein said primary data bit stream with embedded secondary signal shall be modulation encoded, in particular by a 17PP modulation encoder (4), using a first or a second modulation table, wherein the second modulation table is used only for modulation encoding of predetermined combinations of the last bits of a recording frame, and wherein the first bit of a frame sync indicates which modulation table has been used for modulation encoding of the last bits of the previous recording frame, said device comprising:
a check unit (31) for checking if a setting of the last DC-control bit of a first recording frame to two different bit values results in an identical polarity of the frame sync of a second recording frame directly following said first recording frame,
a setting unit (32) for setting,
a) in a first case, where said check results in different polarities, the last DC-control bit of the first recording frame to a bit value controlled by the bit value of a secondary bit of said secondary signal to be embedded resulting in a polarity of the frame sync of the second recording frame representing the bit value of said secondary bit, orb) in a second case, where said check results in identical polarities, the second last DC-control bit of the first recording frame or the first bit of the frame sync of the second recording frame to a bit value controlled by the bit value of said secondary bit.