Distorted waveform from PC microphone - Page 2 - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Solid State Talk all about solid state amplification.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 27th October 2012, 12:14 PM   #11
diyAudio Member
Join Date: Mar 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%!


-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....
  Reply With Quote


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
XLR Microphone into PC hewo PC Based 21 28th April 2016 04:03 PM
Mods for cheap PC microphone? TheLaw117 PC Based 8 12th October 2012 07:31 PM
What waveform to use for testing? __BriKs__ Class D 0 10th December 2006 06:00 PM
help with zen waveform jcayer Pass Labs 17 23rd February 2005 03:10 AM

New To Site? Need Help?

All times are GMT. The time now is 07:09 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2