Daqarta
Data AcQuisition And Real-Time Analysis
Scope - Spectrum - Spectrogram - Signal Generator
Software for Windows
Science with your Sound Card!
The following is from the Daqarta Help system:

Features:

Oscilloscope

Spectrum Analyzer

8-Channel
Signal Generator

(Absolutely FREE!)

Spectrogram

Pitch Tracker

Pitch-to-MIDI

DaqMusiq Generator
(Free Music... Forever!)

Engine Simulator

LCR Meter

Remote Operation

DC Measurements

True RMS Voltmeter

Sound Level Meter

Frequency Counter
    Period
    Event
    Spectral Event

    Temperature
    Pressure
    MHz Frequencies

Data Logger

Waveform Averager

Histogram

Post-Stimulus Time
Histogram (PSTH)

THD Meter

IMD Meter

Precision Phase Meter

Pulse Meter

Macro System

Multi-Trace Arrays

Trigger Controls

Auto-Calibration

Spectral Peak Track

Spectrum Limit Testing

Direct-to-Disk Recording

Accessibility

Applications:

Frequency response

Distortion measurement

Speech and music

Microphone calibration

Loudspeaker test

Auditory phenomena

Musical instrument tuning

Animal sound

Evoked potentials

Rotating machinery

Automotive

Product test

Contact us about
your application!

Sound Card Device Selects

Controls: Edit Menu >> Start Preferences >> Device
Macros: DevOut, DevIn

This pair of controls at the top of the Start Preferences dialog allows you to select which sound card to use when you have more than one installed. If you wish to use different cards or USB devices for different Daqarta sessions, see Managing Multiple Devices. (If you only have a single card, these controls are disabled.)

There are separate controls for Output and Input devices, with the corresponding device descriptions above each control. As you scroll the device number, its description will change to match.

If you have only one Output or Input device in your system, the relevant control is disabled.

Note that changes here don't take effect until the next time Daqarta starts.

Although the Output and Input device controls are separate, you should always set them to refer to devices on the same card. Otherwise, the input and output waveforms can not be properly synchronized.

(This cumbersome dual-control method is necessitated by the fact that many sound cards now structure their inputs and outputs as separate devices, indistinguishable from physically distinct cards.)

However, it is possible to use devices on different sound cards as long as you recognize the limits. First of all, if you wish to have the composite system calibrated, you will need to run Auto-Calibrate with that system... even if you have already calibrated each card independently using its own Output and Input devices. When you calibrate, you can skip the Duplex Delay operation; the results will be meaningless here.

You can still use the Output device to create test signals with the Generator, and monitor the responses with the Input device. But since the output and input waveforms won't be time-aligned, you need to rely on the input waveforms alone for waveform averaging, or timing measurements like response latency. (That's actually the best procedure anyway, even with Output and Input on the same card.) See Full-Duplex Techniques for a discussion.


Macro Notes:

Attempting to change a disabled control via macro will result in an error message, and the macro will be aborted.


See also Start Preferences Dialog, Run Preferences Dialog

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