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!

AM Modulation Frequency


Macro: AMmodFreq

This sets the AM modulator frequency when Source is set to Sine. The main Frequency Entry Mode affects this control as well.

One unusual use of AM is to produce controllable 2nd-harmonic distortion for testing purposes. If you set the AM Sine modulator frequency to match the main (carrier) Frequency, you can adjust the amount of the 2nd harmonic using the AM Depth control. There will also be a DC term (the difference term, where both frequencies are equal) which you can control by adjusting the relative phases.

The frequency resolution of this and all Generator frequency displays may be set between 0 and 9 decimal places via the Frequency Places option in the Frequency Step Mode dialog, invoked by clicking the button below the Main Freq control higher up in this AM dialog. (The button shows the current Step Mode, which defaults to Step Direct.)


Macro Notes:

L.1.AMmodFreq=100.5 sets the Left Stream 1 AM Modulation Frequency to 100.5 Hz.

AMmodFreq=>1 will increment or AMmodFreq=>-1 will decrement the current AM Modulator Frequency by 1 Frequency Step. Only +/-1 step is allowed per command, but the step size and type can be controlled via the Frequency Step dialog. Note: The Frequency Step setting affects the behavior of almost all Generator frequency controls.


See also Amplitude Modulation, Amplitude Modulation Dialog, Waveform Stream Controls.

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