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 Train Cycle


Macros: TrainCycle, TrainCycleMod

A Burst Train is a series of Bursts, followed by a silent interval. Each individual burst consists of Lag, Rise, High, Fall, and Cycle components. This control sets the duration of the overall train, including all the bursts plus the silent time.

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. You can easily set a maximal value by entering '5G' (5 Giga-samples or -seconds) and letting Daqarta limit the value to the maximum.

More importantly, setting the limit value has a special effect: Daqarta assumes you mean "infinite" and never repeats the train after the first complete train cycle. This is handy for creating long-duration tests and sound exposures, where you want the sound to shut off hours later when nobody is around to do it manually.


Train Cycle Modulation

Normally, you can ignore the small Cycle pushbutton and just use the edit portion of the control. The button opens a Burst Time Modulator dialog that allows the Train Cycle time 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 Train Cycle value from that dialog (it's just a duplicate of the main Train Cycle control), as well as the modulation depth.

When modulation is applied, the effective Train Cycle time is equal to the sum of the base Train Cycle value plus the modulator scaled by the modulator depth. For example, if the depth is 10% then the effective Train Cycle ranges from 90% to 110% of its base value. If the base Train Cycle is 10000 samples, the effective Train Cycle will then range from 9000 to 11000 samples.

Note that when Train Cycle modulation is used, 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.TrainCycle=10000 sets Left Stream 1 Train Cycle to 10000 samples, assuming Smpl mode. It will set 10000 seconds in sec mode. To be safe, use a SmplSec command to set the desired mode before using this command.

L.1.TrainCycle=>1 increments and L.1.TrainCycle=>-1 decrements by one sample, even in sec mode. Only +/-1 sample steps are allowed.

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


See also Burst Overview, Burst Dialog Controls

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