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Distorted waveform from PC microphone
Distorted waveform from PC microphone
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Old 27th October 2012, 01:14 PM   #11
ITPhoenix is offline ITPhoenix  United States
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Join Date: Apr 2012
Location: New York
Default Update

I am now running on a different machine. A Core i7 920. VA works much better and even works perfect on Debian Linux 64 bit (box stock). The sound card is the same. The old machine had an Athlon 1.8 single core.

The following has been observed:

-Noise is greatly reduced.

-DC offset is reduced, except it is below the X axis instead of above.

-The bothersome spikes lower than the fundamental are greatly reduced in number and magnitude, with either the mic or the VA wave generator as input.

-When the generator is running, one core is completely pinned at 100%!

Conclusion:

-Single core processor is no good for VA.

-The system board and power supply combination may influence performance.

-Sample rate adjustments should be made to reduce distorted waveforms at higher frequencies. FFT and Sample Rate must be adjusted in tandem. Changing one without the other renders the program unusable with some combinations. 8192 and 81920 worked good for me.

-An inexpensive sound card is probably sufficient for most needs. According to an evaluation I read, the high end sound cards are better all around and will offer a second channel. Mic inputs are mono. High may actually be an economical alternative to purchasing a real scope, for audio anyway....
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