National Instruments Printer PCI-1405 User Manual download pdf (Page 13)

Chapter 2 Hardware Overview

NI PCI-1405 User Manual 2-2 ni.com

Video Acquisition

The NI 1405 can acquire analog color video in a variety of modes and then

store the images in the onboard SDRAM memory or transfer the images

directly to PCI system memory.

Video Decoder

The NI 1405 supports NTSC and PAL video standards in composite

format. The onboard video decoder converts the incoming video signal to

red, green, and blue (RGB) data.

The video decoder allows you to control numerous parameters to optimize

an acquisition. You can independently adjust parameters, such as analog

input range, brightness, contrast, saturation, or frequency range, which is

controlled by different filters. Refer to the Measurement & Automation

Explorer Help for NI-IMAQ, which is installed with NI-IMAQ, for a

complete description of the NI 1405 video parameters.

The video decoder also strips out all necessary clock and synchronization

signals included in the video signal and controls the acquisition conditions

automatically. High-quality circuitry can generate the synchronization

signals from poor timing signals. This allows you to acquire from, for

example, a video cassette recorder (VCR).

SDRAM

The NI 1405 has 16 MB of onboard high-speed synchronous dynamic

RAM (SDRAM). The NI 1405 can use the onboard RAM as a first-in

first-out (FIFO) buffer, transferring the image data as it is acquired or

acquiring the image data into SDRAM and holding it for later transfer

to main memory.

Trigger Control and Mapping Circuitry

The trigger control monitors and drives the external trigger line. You can

configure this line to start an acquisition on a rising or falling edge and

drive the line asserted or unasserted, similar to a digital I/O line. You can

also map many of the NI 1405 status signals to this trigger line and program

the trigger line in polarity and direction.

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National Instruments Printer PCI-1405 User Manual Page 13