Methods and apparatus for analyzing microphone placement for watermark and signature recovery

A system to analyze microphone placement for at least one of watermark detection and signature generation, the system comprising:

• an audio sensor;
• a meter in communication with the audio sensor, the audio sensor to convert a noise burst sensed by the audio sensor to a digital signal;
• and
• a processor to:
• determine a frequency spectrum of the digital signal;
• determine a variance of a magnitude spectrum of a frequency band corresponding to the frequency spectrum;
• and
• determine, based on the variance, a recovery rate associated with at least one of watermark detection or signature generation to be performed on an audio signal.

An apparatus to analyze microphone placement for watermark extraction and signature generation, the apparatus comprising:

• means for determining a frequency spectrum of a noise burst detected by audio sensing means, the noise burst represented as a digital signal;
• means for determining a variance of a magnitude spectrum of at least one of a first frequency band associated with first media or a second frequency band associated with second media, the first and second frequency bands corresponding to the frequency spectrum of the noise burst;
• and
• means for determining a recovery rate, the recovery rate to be determined based on the variance and at least one of a first map for the first frequency band or a second map for the second frequency band, the recovery rate associated with at least one of watermark detection or signature generation to be performed on an audio signal of at least one of the first or second frequency band corresponding to the first and second media, respectively, detected by the audio sensing means, the recovery rate corresponding to a placement of the audio sensing means.