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视频信号触发NI的高速数字化仪(示波器)



主要软件:
主要软件版本: 1.1
主要软件修正版本: N/A
次要软件: LabVIEW Development Systems>>LabVIEW Professional Development System
硬件: Modular Instruments>>High-Speed Digitizers (Scopes)>>PCI-5122, Modular Instruments>>High-Speed Digitizers (Scopes)>>PCI-5114, Modular Instruments>>High-Speed Digitizers (Scopes)>>PCI-5122, Modular Instruments>>High-Speed Digitizers (Scopes)>>PXI-5142, Modular Instruments>>High-Speed Digitizers (Scopes)>>PCI-5142, Modular Instruments>>High-Speed Digitizers (Scopes)>>PXI-5114, Modular Instruments>>High-Speed Digitizers (Scopes)>>PXI-5124, Modular Instruments>>High-Speed Digitizers (Scopes)>>PCI-5124, Modular Instruments>>High-Speed Digitizers (Scopes)>>PXI-5122

问题: 我正在开发一个视频信号采集应用,通过视频信号的高低来触发采集功能。哪一款NI的高速数字化仪(示波器)支持视频触发,并且支持哪些视频格式呢?

解答:

有四款NI的高速数字化仪支持视频信号触发,它们分别是NI-5114/5122/5124/5142.这四款设备都支持标准定义视频信号(SDTV),但是只有NI-5114支持EDTV和HDTV。关于支持的信号格式与NI高速数字化仪的对应关系,请参照下表:

如果要在LabVIEW中使用高速数字化仪的视频触发功能,需要使用NIScope Configure Trigger (polymorphic) VI,并且为一下几个输入参数创建输入控件或者常量:

·    Trigger Source

·    Enable DC Restore

·    Signal Format

·    Polarity

·    Trigger Coupling

·    TV Event

 




相关链接: NI Developer Zone: NI-5122/5124 Video Triggering
NI Developer Zone: Anatomy of a Video Signal
Set-Top Box and Blu-ray Player Testing

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报告日期: 10/24/2008
最近更新: 07/28/2015
文档编号: 4QNDNHVP