Patent ID: 8676570

Claim:
A method comprising: receiving an audio signal including an audience measurement code embedded therein using a first plurality of frequency components; sampling the audio signal; transforming the sampled audio signal into a first frequency domain representation; determining whether the code is detected in the first plurality of frequency components of the first frequency domain representation; when the code is not detected in the first plurality of frequency components, examining a second plurality of frequency components of a second frequency domain representation of the sampled audio signal to determine whether the code is detected, the second plurality of frequency components being offset from the first plurality of frequency components by a first offset, the first offset corresponding to a first sampling frequency mismatch; and when the code is not detected in the second plurality of frequency components, examining a third plurality of frequency components of a third frequency domain representation of the sampled audio signal to determine whether the code is detected, the third plurality of frequency components being offset from the first plurality of frequency components by a second offset different than the first offset, the second offset corresponding to a second sampling frequency mismatch.