![]() I am not aware of any captures of the beacons on live content, however. This makes a lot of sense I was having some doubts about the reliability of detection of the short and complex frequency excursions described above. Update (19 November 2015): Analysis by several researchers is providing increasing evidence that the nature of the beacons is considerably different from the above, taking the form of much slower (1-2 second) tones in the 18-20 kHz range. This is close to the right frequency range (except that 17.5 kHz would collide with a lot of the program information), but doesn’t appear to be the encoding used in this sample. It refers to the insertion of frequency-shift keying modulated data at 17.5 and 18.5 kHz. Update (11:40 AM): Katie McInnis of the Center for Democracy and Technology pointed out the patent application for this technology which was listed under another company. ![]() This is pretty stealthy for a company that claims to “Increase TV advertising transparency with real-time TV analytics”.Īnd no, the beacons wouldn’t bother your dog. I haven’t managed to analyze the high frequency content, but this looks like it might be the way the beacons work. plugins that extract descriptive information from audio data, were used in Sonic Visualizer. As the spectrogram (see second picture) indicates, the first instance of “party” includes some content above 18 kHz that isn’t there for the other two, although they sound remarkably similar. frequencies in the infrasonic and ultrasonic spectrums. In one particular example, a promo for CN’s Regular Show included a clip where some characters are chanting “party, party, party”. The bigger surprise was the presence of some high frequency content above the usual cutoff frequency. Note high frequency excursions on the first instance.
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