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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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Waveform (Stream) Controls Dialog

Controls: Generator Dialog >> Waveform Controls
Macros: GenWavL, GenWavR

The Left and Right 'Waveform Controls' buttons near the center of the main Generator dialog are used to invoke additional dialogs to control the details of signal generation for each channel.

The dialog that is invoked is called a 'Stream', and it specifies a complete independent signal generator. Up to four of these separate components (Stream 0 through Stream 3) may be combined to create the overall output for each Left or Right channel, giving a total of 8 different simultaneous signals.

A Stream may be rather complex in itself, with any combination of modulators. For example, one Stream may be a train of sinusoidal tone bursts having an overall rising frequency sweep. Another Stream may be an amplitude modulated band of noise. Yet another may be a playback of a previously-recorded sound, but played in reverse with an added frequency modulation warble.

Normally, all active streams are summed together to create the respective channel output. Each stream is scaled according to its separate Level control before summing, so you can adjust the relative balance.

Alternatively, if a stream has been designated as a Modulator Source by one of the modulation dialogs, that stream will not be summed directly into the output. Its influence will only be via the modulation it provides to one or more other streams.

A stream can only modulate a higher-numbered stream of the same channel, so L.0 Stream can modulate L.1, L.2, or L.3 but can never be modulated itself. Conversely, L.3 Stream can be modulated by L.0, L.1, or L.2 but can never be a modulator. A stream can't modulate streams of the other output channel.


Macro Notes:

GenWavL=1 opens the Left Stream dialog, GenWavR=1 opens the Right. If the opposite channel Stream dialog is already open it will be closed first, including any dialogs that may be open within the Stream.

GenWavL=0 or GenWavR=0 will close the Stream dialog if open for that channel, including any dialogs that may be open within the Stream.

These commands do not support ' x' to toggle, but they do allow IF tests.


See also Signal Generator Control Dialog.

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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