Patent ID: 7631189
Filing Date: 2009-12-08
Classification: G11B

Abstract:
1. An information recorder/processor comprising: a modulated data producing section for setting a DC control bit to data to be recorded and executing data modulation to produce a modulated recording frame as a record unit of data; and a DC control bit specifying section for specifying a bit value set at an additional data-associated DC control bit setting position selected from a plurality of DC control bit setting positions contained in a additional data-associated recording frame based on additional data constituent bit information, wherein said modulated data producing section executes processing for setting a bit value at the additional data-associated DC control bit position in said additional data-associated recording frame according to an instruction by said DC control bit instruction section, wherein said DC control bit specifying section decides one bit information selected from a plurality of different DC control bit information corresponding to constituent bit information of one additional data as bit information to be set at an additional data-associated DC control bit position, and also decides that when bit information based on DSV measurement at the additional data-associated DC control bit position is identical to DC control bit information corresponding to additional data constituent bit information to be set, then bit information different from the bit information based on DSV measurement is set at the additional data-associated DC control bit position.