Thanks for the reply .
I have tried the same on many vendor's DVr card and on many pCs but we are getting the same or some what diffrent problem , at last the result is sond is not good with DVR card.
I donot know where is shorting ???
Can you suggest me some ideas?
i tried the same audio device with HIKVISION's card it is working ok but other company's card it is giving the common problem .
waiting for the reply