CBET

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CBET
CBETDemod.png
Frequencies "-108MHz" is not declared as a valid unit of measurement for this property."-1700kHz" is not declared as a valid unit of measurement for this property.
Frequency Range 0 Hz - 0 Hz
Mode
Modulation FM,AM
ACF
Bandwidth 2 kHz
Location
Short Description CBET "Critical Band Encoded Tones" are tones added into radio broadcast's audio output for identification purposes.
I/Q Raw Recording
Audio Sample

CBET/eCBET tones are a set of 10 frequency modulated tones between 1-3kHz. These signals are inserted into broadcast audio in over 50 major markets for identification by "Portable People Meters" used in Nielsen's rating scheme. Nielsen controversially purports that these signals are encoded in such a way that they are 'masked' by the program audio.


Samples[edit]

Frequencies[edit]

Broadcast FMFrequency Modulation/AMAmplitude Modulation

Decoding Software[edit]

Proprietary modulation scheme.

Additional Links[edit]