> > (b) When I do a presentation in a hall (both recording and playing back, and > maybe multiple speakers), can PA module-echo-cancel reduce the > echo/feedback? > > Do you currently have issues with the echo when recording such live > events? Really, these recordings should be free of echo if you set > thing up properly. Again, having the right equipment and installing it > correctly is key here. I don't have recording issues but just want to understand module-echo-cancel's capability. Thank you so much for teaching me a lesson of room acoustics and the solutions :-) So my last question is whether module-echo-cancel can reduce the background noise during recording? If yes, what colors of noise can it reduce? There are many colors of noise as wiki says http://en.wikipedia.org/wiki/Colors_of_noise Thanks Mengdong
