virtins.com

I discovered the ASIO4all drivers the other day.
I downloaded and installed them on the laptop.
However, I couldn't get them to work with the x-fi USB :-

I followed the instructions in the PDF that came with the drivers.
After selecting ASIO under the Vitirns ADC and DAC settings and clicking 'Run ...

This appears a similar issue to the problem I recently reported under 'Soundcard Spurious Signals'.
In my case, the spurious frequency peaks for a 1kHz input signal are not the same.

My results were similar on two different PCs with two different sound cards (one PCI, the other USB).
I also found ...

To recheck my findings, I have carried out the test in the opposite direction...

This time using the Virtins sig gen in the PC with the audigy 2 card feeding into the x-fi USB connected to the laptop.
The spurious signals are there as before. Inserting the 1kHz low pass filter has no effect on the ...

I'm not sure if ASIO drivers are available for the sound blaster x-fi USB.

I did some more tests today. The results are even more puzzling:-

First I installed the Virtins sofware on another PC: A desktop machine running 32bit Windows XP.
This has a sound blaster audigy 2 PCI card.

I looped back ...

Some additional info...

1) The amplitude of the signal generator was set well below the clipping threshold during my tests.
2) The amlplitude of the spurious signals relative to the fundamental remained unchanged even if I changed the level of the signal generator. i.e. they are always between 60 ...

I have been evaluating the Virtins spectrum analyser using a laptop PC connected to a 'Creative Soundblaster x-fi USB'.

Initially I was using it to look at the frequency spectrum from a home constructed Wien Bridge Oscillator. As well as the expected oscillator harmonics, I was puzzled to see some ...