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You can request repair, schedule calibration, or get technical support. A valid service agreement may be required.
Provides support for NI data acquisition and signal conditioning devices.
Provides support for Ethernet, GPIB, serial, USB, and other types of instruments.
Provides support for NI GPIB controllers and NI embedded controllers with GPIB ports.
当摄像头输出隔行扫描视频信号时,如何区分奇数场和偶数场,让抓帧器或者监视器识别出当前接收到的是哪一场?
在RS-170标准中,活动视频信号的最后一行根据奇偶场的不同或者是全行信号,或者是半行信号。在奇数场的最后,会发送一个额外的半行信号,表示下面发送的将是偶数场。同样,在奇数场的最后发送的是一个全行的活动视频信号,表示下面发送的将是奇数场(参考下面的图示)。
NI的抓帧器能够识别出这个特征进而标识出奇偶场。
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A valid service agreement may be required, and support options vary by country.
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