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!

Triggered_Burst: Event-Triggered Burst

When an event-triggered macro detects a key press, sound card input signal, external digital state change, or external DC level change, it invokes the Trig_Target macro, which by default invokes this Triggered_Burst macro.

This indirect operation means you only need to replace one line in Trig_Target to enable any of the trigger macros to use it. Triggered_Burst was chosen as the default because it demonstrates event triggering, but it's also a useful macro on its own.

Triggered_Burst automatically loads the Burst_5ms_X2.GEN Generator setup each time it is run. This is a good demo, but you can create your own burst setup to meet your particular needs, which Triggered_Burst can use instead. Triggered_Burst assumes the burst will be generated on Left Stream 0, so you should be sure to use that for your own burst setup.

You can change the A.LoadGEN="Burst_5ms_X2" line to auto-load your own setup, or put a semicolon at the start of the line to disable the auto-load and load manually before use.

As written, Burst_5ms_X2.GEN creates two 5 ms bursts separated by a 3 ms gap, and repeats this every second.

Triggered_Burst modifies the burst parameters of the loaded setup (but not the .GEN file itself) to eliminate automatic repetition by setting a very long Train Cycle in the Burst Dialog. With the default Burst_5ms_X2.GEN this will result in a single instance of the two bursts for each triggering event.

A non-burst setup, such as a continuous tone, will not be converted to a burst by Triggered_Burst.

Your own burst may be arbitrarily long, and may use Arb or Play files with your own recorded sounds; see the suggestions under Trigger on Sound Card Input.

The macro uses normal level-based triggering with the Left Stream 0 generator output as the trigger source. The trigger level is set to 20% of full scale; this is a compromise, intended to catch the waveform peak of a recorded sound, while ignoring any leading noise. Negative trigger delay is then used to show the build-up before the trigger point.

Likewise, with a regular generated waveform that has a slow rise time, the 20% trigger level may come well after the nominal starting point. You can set a larger negative delay to see more of the start, or set a lower trigger level.

;<Help=H492B

A.LoadGEN="Burst_5ms_X2"   ;Change or delete as needed

Ch=0                ;L.0. Stream
TrigSrc=LO          ;Left Out trigger source
TrigSngl=0          ;Disable Single-frame operation
TrigMode=Norm       ;Normal level-based trigger
TrigLevel=20        ;Trigger at 20% of full scale
Trig=1              ;Trigger on
SmplSec=1           ;Force seconds units
TrigDelay=-5m       ;Display starts 5 ms before trigger
Ch.TrainLag=150m    ;Wait for sync restart if Input active
Ch.TrainCycle=5G    ;Set maximum delay before next burst
TrigHold=Ch.TrainCount * Ch.BurstCycle  ;No re-trig during burst
Gen=1               ;Start the Generator

See also Macro Examples and Mini-Apps

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