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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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Synth MIDI Note

Controls: Edit Menu >> Synth Controls >> Note
Macro: MIDInote

This selects the MIDI note number, which you can use here as a frequency control with the sound card's built-in synthesizer. Notes are numbered 0-127, where 69 is 440.000 Hz ("Concert A"). The Standard Musical Note Frequencies section has a list of key names, MIDI note numbers, and frequencies that covers the standard piano keyboard range.

You can compute the frequency of any MIDI note N from

Freq = 440 * 2^((N - 69) / 12).


See also Synthesizer 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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