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!

DAT Sample Rate

Controls: DD/Open >> DAT Format >> Sample Rate
Macro: DATrate

Since a .DAT-type file doesn't have a header that Daqarta can use to determine the sample rate that was used to acquire the data, you can use this control to force an arbitrary rate. The default value is 44100 samples per second.

The .DAT Sample Rate setting doesn't affect the appearance of the waveform or its spectrum, but it does affect the X-axis calibration.

The minimum rate you can set here is 120 Hz. However, note that the overall effective rate includes the Decimate X control just below this, which acts like a divisor. So if your raw data was sampled at (say) 64 Hz you could set .DAT Sample Rate to 640 and Decimate X to 10. That will result in the correct 64 Hz X-axis calibration for both time and frequency.


See also File Menu, Open Existing Data File, .DAT File Format Dialog

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