Radio broadcasters in so-called “PPM Markets” are faced with managing two signals for each station. One is the audio program that listeners hear; the other is the watermark signal heard by Personal People Meters (PPM)™. Broadcasters concerned with counting their listeners (all of them in a PPM market) must treat their watermark signal with similar care to their on-air audio. In this episode, Dr. Barry Blesser explains the science of audio watermarking. Then Paul Kriegler describes the Best Practices for making sure your watermark signal is consistently detected in the field.