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1. 发明授权

EP1615430B1 AUTOMATIC GAIN CONTROL CIRCUIT 有权
标题翻译：自动增益控制电路
公开(公告)号：EP1615430B1
公开(公告)日：2011-08-10
申请号：EP04726023.7
申请日：2004-04-06
申请人： Asahi Kasei EMD Corporation
发明人： SASAHARA, Hideaki , UKAJI, Nobuyoshi , ISHIHARA, Ken
IPC分类号： H04N5/52
CPC分类号： H04N5/52 , H03M1/183
摘要： An AGC control section (110) has a first operation mode for controlling the gain of a variable gain amplifier (103) so that the amplitude of a synchronization signal measured by a synchronization signal amplitude measurement circuit (108) is maintained constant and a second operation mode not increasing the gain even if the amplitude of the synchronization signal measured by a video signal processing circuit (109) is smaller than a predetermined first reference value and reducing the gain of the variable gain amplifier (103) only when the video signal amplitude has become greater than a predetermined second reference value. Here, when the synchronization signal amplitude is smaller than the predetermined first reference value and the video signal amplitude is greater than the predetermined second reference value while the AGC control section (110) is operating in the first operation mode, the mode is switched to the second operation mode. On the other hand, when the synchronization signal amplitude has become smaller than the predetermined first value while the AGC control section (110) is operating in the second operation mode, the mode is switched from the second operation mode to the first operation mode.

2. 发明公开

EP1615430A1 AUTOMATIC GAIN CONTROL CIRCUIT 有权
标题翻译： AUTOMATISCHEVERSTÄRKUNGSREGELUNGSSCHALTUNG
公开(公告)号：EP1615430A1
公开(公告)日：2006-01-11
申请号：EP04726023.7
申请日：2004-04-06
申请人： Asahi Kasei EMD Corporation
发明人： SASAHARA, Hideaki , UKAJI, Nobuyoshi , ISHIHARA, Ken
IPC分类号： H04N5/52
CPC分类号： H04N5/52 , H03M1/183
摘要： An AGC control section (110) has a first operation mode for controlling the gain of a variable gain amplifier (103) to maintain the amplitude of the sync signal measured by a sync signal amplitude measuring circuit (108) at a constant value, and a second operation mode for preventing the gain from being increased even when the amplitude of the sync signal measured by the video signal processing circuit (109) is smaller than the predetermined first reference value and reducing the gain of the variable gain amplifier (103) only when the amplitude of the video signal exceeds a predetermined second reference value. During operation in the first operation mode, when the amplitude of the sync signal is smaller than the predetermined first reference value and the amplitude of the video signal is greater than the predetermined second reference value, the mode is switched to the second operation mode. During operation in the second operation mode, when the amplitude of the sync signal becomes not less than the predetermined first reference value, the mode is switched from the second operation mode to the first operation mode.
摘要翻译： AGC控制部分（110）具有用于控制可变增益放大器（103）的增益以将由同步信号幅度测量电路（108）测量的同步信号的幅度维持在恒定值的第一操作模式，以及即使当由视频信号处理电路（109）测量的同步信号的幅度小于预定的第一参考值并且仅当可变增益放大器（103）的增益减小时，防止增益的第二操作模式，视频信号的幅度超过预定的第二参考值。在第一操作模式的操作期间，当同步信号的幅度小于预定的第一参考值并且视频信号的幅度大于预定的第二参考值时，该模式被切换到第二操作模式。在第二操作模式的操作期间，当同步信号的幅度变得不小于预定的第一参考值时，该模式从第二操作模式切换到第一操作模式。

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