Gaming the PPM system

This is an interesting study, based on solid science. And considering we've just begun the STL adventure in the new rating system, it's important to read. Dr. Blesser makes some important points and he's looked deeply into the process.

When there is more data, the implications will become clearer. At this point, my examination of the PPM system is purely speculative, based on patent disclosures and anecdotal reports distributed in radio industry trade publications. That the various sources of information are consistent does not prove that the picture is accurate or complete. My best guesses at the scenarios most likely to fail are:

• Audio program material with low‐level high‐frequency content, implying low‐level watermarking tones.

• Listening in a noisy environment or with the monitor positioned to receive only a muffled signal, increasing the likelihood that the PPM monitor will not correctly detect the stations’ ID.

When combined, these individual weaknesses might create a “perfect storm.”

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