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!

Sound Card Frequency Modulation (FM)


Macro: FMdlg

This button brings up the Frequency Modulation dialog, and is shown depressed when FM is activated for this stream. The actual FM toggle button is at the top of the opened dialog.


FM Overview

Frequency modulation is when the frequency of one signal (the 'carrier') is controlled (modulated) by the instantaneous value of another (the 'modulator'). Moving the slider on a child's slide whistle modulates the pitch (frequency); here we are effectively moving the slider automatically.

'Vibrato' in music is a form of frequency modulation, although in real-world instruments and voices there is often a certain amount of amplitude modulation ('tremolo') added by the vibrato mechanism. Vibrato typically involves a modulation rate of several hertz.


Macro Notes:

If the Stream dialog is open, FMdlg=1 opens the FM dialog, FMdlg=0 closes it, and FMdlg=x toggles between open and closed.

Note that you do not need to open the FM dialog to change any of its controls directly via macro command.


See also Frequency Modulation Dialog, Waveform Stream Controls

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