发明名称 |
Signal-dependent chrominance subcarrier filtering circuit |
摘要 |
A method and circuit for detecting and removing chrominance signal components from the luminance channel of a television receiver is shown. The luminance channel is separated into distinct subchannels, one of which has a filter providing attenuation at the chrominance subcarrier frequency. A detection circuit operates to select the output of the filtered subchannel whenever a chrominance subcarrier signal appears in the luminance channel. The detection circuit is sensitive to the phase relationship between the chrominance signal and a portion of the luminance signal and is therefore substantially immune to signals other than chrominance subcarriers, including high frequency components of the luminance signal.
|
申请公布号 |
US4149181(A) |
申请公布日期 |
1979.04.10 |
申请号 |
US19770830219 |
申请日期 |
1977.09.02 |
申请人 |
GTE SYLVANIA INCORPORATED |
发明人 |
BURDICK, KENNETH J.;HAND, WILFRED L.;KLEIN, ARTHUR H.;NEAL, CHARLES B. |
分类号 |
H04N9/78;(IPC1-7):H04N9/53 |
主分类号 |
H04N9/78 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|