Blocking out steganosonic data from phone calls

psyced writes: "Steganography is a technique to encode secret messages in the background noise of an audio recording or photography. There have been attempts at steganalysis in the past, but scientists at FH St. Pölten are developing strategies tp block out secret data in VoIP and even GSM phone calls by preemptively modifying background noise (english translation) on a level that stays inaudible and invisible to human eye, yet destroys any message encoded within. I wonder if using executables is vulnerable, too."