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:

# Also Reset AM, FM, or PM Sine

Controls: Gen Dlg >> Stream >> Tone Freq >> AM/FM/PM Sine
Macros: ToneRstAM, ToneRstFM, ToneRstPM

When the main Phase is reset on a Burst, Train, or Sweep, these buttons allow you to specify that any or all of the AM, FM, or PM (Phase/Width/Ramp) Sine modulators will also be reset.

These options are useful in creating waves that have modulation synchronized with the reset event. For example, if you are generating bursts of amplitude-modulated sine waves, and you want each burst to be identical, it is not enough to only reset the phase on the Burst start; if the AM modulator frequency is not an integer sub-multiple of the main wave, the modulation may start at arbitrary amplitudes on each burst, depending on where the burst falls within the modulation cycle. Setting Also Reset AM Sine will insure that each burst starts with the same modulation phase.

When the modulator is reset, it is forced to the Modulator Phase value of the relevant modulator. Note that in the above example an AM Phase setting of zero will cause the burst to start with the modulation at zero, which is not the same as an overall amplitude of zero. To start at zero amplitude, set AM Phase to -90 degrees (270 degrees). Set it to 90 degrees to start at peak amplitude. (These notes assume you have set AM Depth to 100% or less, for normal AM.)

Macro Notes:

L.1.ToneRstAM=1 will cause the Left Stream 1 AM modulator to be reset to its AM Phase value whenever the Burst, Train, or Sweep reset is performed. L.1.ToneRstAM=0 cancels that, and L.1.ToneRstAM=x toggles it on and off.

ToneRstFM and ToneRstPM work similarly for the FM and PM modulators.

GO:

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