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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.
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Frequency Entry Step Mode

Controls: Gen Dlg >> Stream >> Tone Freq >> Step
Macro: FstepDlg

The Step mode button makes it convenient to step by constant or exponential amounts between frequencies, or to set frequencies which will fall exactly on FFT spectral lines or musical notes.

This button appears below each main Freq control in the Generator, and pops up a Frequency Entry Mode dialog when hit.

The Frequency Entry Mode dialog has controls for selecting Direct, Hertz, Lines, Octave, and Cents steps, and for setting their sizes. When a step mode is selected, it applies to all frequency entry controls, including modulator frequencies and Noise Band edges.

The step mode only affects a frequency being entered or adjusted; afterward, the set frequency remains even if the mode or step value is subsequently changed.

The step mode is a global variable throughout the Generator; it will appear in, and can be changed from, any Generator dialog with a frequency control that has this button. That includes main Tone Frequency, AM, FM, PM, Sweep and Noise Band dialogs, as well as the modulator dialogs for Timing Quantization, Bias, and Shift.

Note that due to the quantization action of step modes other than Direct, attempting to set frequency values lower than half the step size will result in an entered frequency of zero. This can be very disconcerting, for example, if you use a quantizing step mode when setting a carrier frequency, then forget that mode is still in effect when you later go to set a low modulator frequency.

Macro Notes:

FstepDlg=1 opens the Step Mode dialog if a parent dialog showing its button is open, such as the Tone Frequency dialog or one of the modulator dialogs ( Timing Mod, Burst Mod, AM, FM, PM, or Sweep). FstepDlg=0 closes it, and FstepDlg=x toggles between open and closed.

Note that you do not need to open this dialog to change controls directly via macro command.


See also Tone Frequency Dialog, Random / Step Timing, Waveform Stream Controls.

Applications:

Frequency response

Distortion measurement

Speech and music

Microphone calibration

Loudspeaker test

Musical instrument tuning

Animal sound

Evoked potentials

Rotating machinery

Vehicle pass-by noise

Product test

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