12-05-2011 09:59 AM
Since I got the machine I have updated it with all of the MS and Lenovo updates. I am running Windows 7 Professional 64 bit. The audio sound quality is lacking high frequency content. I finally did a series of tests where I played back a file of pink noise at a medium recorded level and connected the phone jack output to an external FFT analyzer.
The output spectrum starts dropping at about 500 Hz and goes to a null at 1000 Hz and then repeats the null at 2 KHz and then the next null is at 4 KHz and then at 8 KHz just like a comb filter except this has octave nulls.
I get the same result with smart audio installed and with it uninstalled.
Any help would be greatly appreciated.
12-12-2011 09:32 PM
12-13-2011 05:31 AM
I found the audio quality of the sound to be unacceptable due to lack of higher frequencies. In testing I found out why the sound quality is deficient. It really does lack high frequency content starting at 1 kHz and repeating at octave intervals. There is a significant lack of overtones in string music. The frequency response looks like a comb filter except instead of having output nulls at linear frequency intervals the outpput nulls are at octave intervals.
I have never seen this in any PC or sound interface and it appears to be a defect, either in the conexant device or the drivers.
12-21-2011 09:14 AM
12-21-2011 11:33 AM
Thanks for the reply. I disabled all audio enhancements. When that did not fix the problem I removed the Conexant Smart Audio package. That also failed to fix the problem. I reinstalled the Smart Audio and again disabled all audio enhancements and that is where it stands now.
12-22-2011 08:32 PM
12-23-2011 05:28 AM
I don't have an image on the web, just a bit map file. I was unable to insert it as an image or paste the image from Word. Is there any way I can email the bit map file?
01-06-2012 09:08 AM
I was able to get a friend to post the image on:
I hope this helps.