Wobble detection circuit and method for processing wobble signals

The invention provides a wobble detection circuit. An exemplary embodiment of the wobble detection circuit comprises an automatic gain control module, an analog to digital converter, a digital band pass filter, and a digital band pass filter. The automatic gain control module amplifies a first input...

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Main Authors Cheng, Yuh, Chen, Chih-Ching, Liao, Chia-Wei, Yu, Ming-Jiou, Lan, Kuo-Jung, Chou, Shu-Hung, Hsieh, Bing-Yu, Chou, Chia-Hua
Format Patent
LanguageEnglish
Published 06.04.2010
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Summary:The invention provides a wobble detection circuit. An exemplary embodiment of the wobble detection circuit comprises an automatic gain control module, an analog to digital converter, a digital band pass filter, and a digital band pass filter. The automatic gain control module amplifies a first input signal and a second input signal detected by a pickup head to the same magnitude to obtain a first amplified signal and a second amplified signal. The adder then subtracts the second amplified signal from the first amplified signal to obtain an analog wobble signal. The analog to digital converter then converts the analog wobble signal to a first digital wobble signal. Finally, the digital band pass filter accepts frequency components of the first digital wobble signal within a pass band and rejects frequency components of the first digital wobble signal outside the pass band to obtain a second digital wobble signal.