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

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your application!

Burst Train Count


Macros: TrainCount, TrainCountMod

Sets the number of burst cycles (Lag, Rise, High, Fall, and Cycle) in the overall Train.

Note that Train Cycle will automatically track Burst Cycle if Train Count is set to 1. If a higher count is used, Train Cycle will automatically increase as needed to meet the product of Train Count times Burst Cycle, but it will not automatically decrease if either of these is reduced.

The total size of the Train Cycle, not counting Train Lag, must be 4294967295 samples or less... about 24.8 hours at a 48000 Hz sample rate. That total includes the product of Train Count times Burst Cycle. If you try to enter any value that would bring the total over the limit, that entry will be constrained such that the limit is met.


Train Count Modulation

Normally, you can ignore the small Count pushbutton and just use the edit portion of the control. The button opens a Burst Time Modulator dialog that allows the Count to be modulated, either by a sine wave source with adjustable frequency and phase, or by some other stream source. You can also set the base Count value from that dialog (it's just a duplicate of the main Count control), as well as the modulation depth.

When modulation is applied, the effective Count is equal to the sum of the base Count value plus the modulator scaled by the modulator depth. For example, if the depth is 40% then the effective Count ranges from 60% to 140% of its base value. If the base Count is 10 samples, the effective Count will then range from 6 to 14 bursts per Train. The effective Count only changes in integer steps; there are no partial bursts when the modulator is at a fractional value.

Note that when Burst Cycle modulation is used with Train Count set to 1, burst Sync will be disabled. You can usually get equivalent results with Trigger Mode set to Normal; see Train / Burst Sync for a discussion of the technique.


Macro Notes:

L.1.TrainCount=10 sets Left Stream 1 Train Count to 10 bursts per train.

L.1.TrainCount=>1 increments and L.1.TrainCount=>-1 decrements by one. Only +/-1 steps are allowed.

If the Burst Dialog is open, TrainCountMod=1 opens the associated Burst Time Modulation dialog, TrainCountMod=0 closes it, and TrainCountMod=x toggles between open and closed. See additional information under Burst Time Modulation.


See also Burst Overview, Burst Dialog Controls

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