There is high amplitude of background noise and audio is not all smooth. First we checked with coping some data to .dev/dsp directory, even with this also there is lot of disturbance, same thing we compared playing on PC which was smooth, so we can conclude that decoder (aplay or mplayer) is not adding extra noise and the problem may be in driver or hardware. On running aplay we are getting lot of underrun errors. Even we tried playing low frequency sound of 250 Hz sine wave even that is not smooth. we also noticed that this is a known issue for Zoom and omap 3430 SDP from the link

http://omapzoom.org/gf/pr...agename=Known+Issues

So can we get the workaround solution for this problem We don’t have registers details of audio codec also in order to look into the detailed programming of codec of the driver.So can we get it