I recently purchased some wireless cameras that connect to a receiver. The receiver then connects to my pc through a vcr to dvd recorder using composite connections. The wireless mic on the cameras generate constant buzzing and makes it very hard to hear. I've heard that line noise can cause this buzzing I am not sure what line would cause the buzzing. The power adapter to the camera? Or the composite connections to the adapter connecting to the computer? I am not sure. Is there any way to get rid of this constant buzzing?