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!

Burst Rise/Fall vs. Spectral Width

Objective: To see the effects of the Rise (and Fall) time on the width of the Tone Burst spectrum.

Set Burst Lag to zero and High to about 128 samples. Set Tone Freq to 2000 Hz. Set Rise and Fall to 128 samples each, and Burst Cycle to 512 samples.

You should see a single tone burst which takes up the first 384 samples of the waveform trace. Flip to the power spectrum display via the Spectrum button (ALT+S) followed by the Y-log button (ALT+Y). Note the width of the spectrum spread on either side of 2000 Hz as you cut Rise and Fall in half to 64 samples each. Keep cutting these in half and watch the spectrum widen further. Check out the effects of different Shapes.

See Fundamental Time - Frequency Domain Concepts for further discussion of this phenomenon.


See also Burst Overview, Basic Burst Operation, Burst Dialog, Waveform Stream Controls.

GO:

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