--- Quote Start ---
On my DE2-70 I don't hear any noise either. If you can reproduce with with multiple good sound samples, I would contact Terasic. It is possible that your board is marginal.
Once I have had to send a Xilinx board back which worked, but the voltage regulator was near melting. The replacement was fine. Marginal boards do happen.
--- Quote End ---
My board is basic DE2 rather than DE2-70. I tried several other such boards in the lab, and found the same problem. I think the problem is due to the low transmit speed of SD card because I tried to put the music from SD card to 4M flash and then played the music from the flash, there was no noise. But the flash is only 4M,it can't hold WAV file more than that size.
Honored Contributor
