CBET
From Signal Identification Wiki
 | |
|---|---|
| Frequencies | 88 MHz,108 MHz,520 Hz,1.7 MHz |
| Frequency Range | 520 Hz - 108 MHz |
| Mode | — |
| Modulation | FM,AM |
| ACF | — |
| Emission Designator | — |
| 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]
Recording from WQXR:
Frequencies[edit]
Broadcast FMFrequency Modulation/AMAmplitude Modulation
Decoding Software[edit]
Proprietary modulation scheme.
