Invention Application
- Patent Title: METHOD OF GAIN CONTROL AND CONTROLLER THEREOF
- Patent Title (中): 增益控制方法及其控制方法
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Application No.: US11755186Application Date: 2007-05-30
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Publication No.: US20070280069A1Publication Date: 2007-12-06
- Inventor: Yuh Cheng , Chih-Ching Chen , Chia-Wei Liao , Ming-Jiou Yu , Kuo-Jung Lan , Shu-Hung Chou , Bing-Yu Hsieh
- Applicant: Yuh Cheng , Chih-Ching Chen , Chia-Wei Liao , Ming-Jiou Yu , Kuo-Jung Lan , Shu-Hung Chou , Bing-Yu Hsieh
- Applicant Address: TW Hsin-Chu
- Assignee: MEDIATEK INC.
- Current Assignee: MEDIATEK INC.
- Current Assignee Address: TW Hsin-Chu
- Main IPC: G11B20/10
- IPC: G11B20/10

Abstract:
The invention provides an automatic gain controller processing an input signal for wobble detection circuit. An exemplary embodiment of the automatic gain controller comprises an envelope detection module, an analog to digital converter, a digital control module, a digital to analog converter, and a variable gain amplifier. The envelope detection module detects an envelope magnitude of an amplified signal. The analog to digital converter converts the envelope magnitude from analog to digital to obtain a digital envelope signal. The digital control module determines a digital gain signal for amplification of the input signal according to the digital envelope signal. The digital to analog converter converts the digital gain signal to an analog gain signal. The variable gain amplifier then amplifies the input signal according to the analog gain signal to obtain the amplified wobble signal.
Information query