audio samples of voltage <>-?

Hi all

Maybe a stupid question, but: if I put a signal audio line out on the inputs to a USB OR card and then use C++ and NIDAQmx to read entries (using a DAQmxCreateAIVoltageChan()) pressures, these tensions are present equivalents of the actual sound amplitudes? I am interested in the idea of theoretical basis, as one who has not studied the signal processing.

Thank you very much!

-Cristina.

Hello Cristina,

Not a stupid question at all--tensions are indeed equivalent to the real sound amplitude (see the wikipedia article line level).  A DAQ card with a range of ±2V should be able to accommodate a typical output audio signal.

If high performance is a requirement, your best best would be to use a card acquiring dynamic signals .  However, these can be very expensive.  If you are looking for just that for a school project or hobby then a common DAQ card would probably be appropriate.

Best regards

Tags: NI Hardware

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