Invention Grant
- Patent Title: Optical black level control circuit
- Patent Title (中): 光电黑电平控制电路
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Application No.: US11111014Application Date: 2005-04-21
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Publication No.: US07714913B2Publication Date: 2010-05-11
- Inventor: Masatoshi Sase , Koichi Higashi
- Applicant: Masatoshi Sase , Koichi Higashi
- Applicant Address: JP Tokyo
- Assignee: Sony Corporation
- Current Assignee: Sony Corporation
- Current Assignee Address: JP Tokyo
- Agency: Frommer Lawrence & Haug LLP
- Agent William S. Frommer
- Priority: JP2004-129071 20040423
- Main IPC: H04N9/64
- IPC: H04N9/64 ; H04N5/217
Abstract:
An optical black level control circuit comprises a digital black level adjusting circuit for generating a black level correction signal by digital processing using a given time constant when an output error between an optical black level and a reference optical black level signal is within a predetermined range so that an error becomes less than a predetermined value and an analog black level adjusting circuit for compensating for said error when said error exceeds the predetermined range.
Public/Granted literature
- US20050237402A1 Optical black level control circuit Public/Granted day:2005-10-27
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