发明名称 |
Multi-standard video option for oscilloscopes. |
摘要 |
<p>A multi-standard video option for an oscilloscope detects whether an input video signal has a bi-level or a tri-level horizontal sync pulse from a composite sync signal derived from the input video signal. A ramp signal is generated from the horizontal sync pulse having a slope of one polarity that changes to a slope of the opposite polarity when the horizontal sync pulse is tri-level. For a bi-level horizontal sync pulse the ramp is limited in magnitude and rapidly discharged at the end of the horizontal sync pulse. A digital output signal is generated from the ramp signal and has a width equal to the width of the horizontal sync pulse regardless whether it is bi-level or tri-level. From the type of horizontal sync pulse and the width or the number of lines per frame, a video standard is determined and is subsequently used to determine field identification and to automatically set up the horizontal sweep of the oscilloscope according to a selected video setup. <IMAGE></p> |
申请公布号 |
EP0444804(A1) |
申请公布日期 |
1991.09.04 |
申请号 |
EP19910301260 |
申请日期 |
1991.02.18 |
申请人 |
TEKTRONIX, INC. |
发明人 |
KLECK, JEFFREY A.;BURKHARDT, ANDREW J.;BINGOLD, STEVEN R. |
分类号 |
G01R13/32;H03K3/00;H04N5/06;H04N17/00 |
主分类号 |
G01R13/32 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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