|
Jos > I am working with a DSK6711 and a PCM3003 to develop an acoustic echo > canceler. I have develop a loopback program and it seems to work fine, > but if I amplify the output of my PCM3003 a good cross-talk appears. Well it's a cheap daughtercard, so hopefully you are not expecting too much. Try this: ground the input externally, then use DSP to output a full scale sine wave. In the DSP code record the level of input you are seeing and compare the ratio of the 2 sine waves. How many dB? It might be that you have a good 40 or 50 dB or so separation, even though you can still see the nasty thing on the scope. Jeff Brower system engineer Signalogic |