发明授权
- 专利标题： Clamp level setting method for television signals
- 专利标题（中）： 电视信号钳位电平设定方法
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申请号： US494170申请日： 1990-07-25
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公开(公告)号： US5191422A公开(公告)日： 1993-03-02
- 发明人: Fujio Cho , Toshiyuki Shimizu , Yasuharu Ashida
- 申请人： Fujio Cho , Toshiyuki Shimizu , Yasuharu Ashida
- 申请人地址： JPX
- 专利权人： NEC Corporation
- 当前专利权人： NEC Corporation
- 当前专利权人地址： JPX
- 优先权： JPX1-62167 19890316
- 主分类号： H04N5/18
- IPC分类号： H04N5/18 ; H04N19/00 ; H04N19/126 ; H04N19/15 ; H04N19/423 ; H04N19/85 ; H04N19/91
摘要：
A method for setting the clamp level of a television signal in which the signal is converted by an A/D converter and quantized with a plurality of quantizers, comprises taking into account the quantization characteristics of the various quantizers in addition to the dynamic range of the A/D converter. The television signal is level shifted so that it is within the dynamic range of the A/D converter and is clamped to a level which minimizes the quantization error of that quantizer which has the largest quantization step size of all the quantizers.
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