| 摘要 |
A wobble signal detection circuit for detecting a wobble signal based on signals provided from first and second light receiving elements that are divided from each other in a direction tangential to a spiral or concentric recording region of an optical recording medium in which the first and second light receiving elements receive light that is reflected from a surface of the optical recording medium. The wobble signal detection circuit comprises a first sample circuit for, in sync with a specific control signal, sampling a first voltage signal corresponding to an electric signal converted from a light signal being based on the reflected light received by the first light receiving element, wherein the specific control signal is specific to a period for forming a space region when recording information on the optical recording medium; a first amplifying circuit for amplifying an amplitude of the sampled first voltage signal output from the first sample circuit, and outputting the amplified first voltage signal; a second sample circuit for, in sync with the specific control signal, sampling a second voltage signal corresponding to an electric signal converted from a light signal being based on the reflected light received by the second light receiving element; a second amplifying circuit for amplifying the sampled second voltage signal output from the second sample circuit, and outputting the amplified second voltage signal; and an arithmetic processing circuit for receiving the amplified first voltage signal output by the first amplifying circuit, the amplified second voltage signal output by the second amplifying circuit, the first voltage signal output by the first light receiving element, and the second voltage signal output by the second light receiving circuit, and for performing an arithmetic process on the received signals so as to output the wobble signal. <IMAGE> |
