Methods and apparatus for increasing the robustness of media signatures

A non-transitory computer readable storage medium comprising instructions which, when executed, cause a machine to at least:

• determine a first difference between (A) a first characteristic of an audio signal at a first time and (B) a second characteristic of the audio signal at a second time;
• compare the first difference to a first threshold;
• at least one of (A) boost the first characteristic of the audio signal at the first time or (B) attenuate the second characteristic of the audio signal at the second time when the first difference does not satisfy the threshold to create an enhanced audio signal;
• and
• determine whether a second difference between a third characteristic of the enhanced audio signal at the first time and a fourth characteristic of the enhanced audio signal at the second time satisfies the threshold, the third characteristic corresponding to the first characteristic, the fourth characteristic corresponding to the second characteristic.

An method to enhance characteristics of an audio signal, the method comprising:

• determining a first difference between (A) a first characteristic of an audio signal at a first time and (B) a second characteristic of the audio signal at a second time;
• comparing, by executing an instruction with a processor the first difference to a first threshold;
• at least one of (A) boosting, by executing an instruction with the processor, the first characteristic of the audio signal at the first time or (B) attenuating, by executing an instruction withe the processor the second characteristic of the audio signal at the second time when the first difference does not satisfy the threshold to create an enhanced audio signal;
• and
• determining, by executing an instruction with the processor, whether a second difference between a third characteristic of the enhanced audio signal at the first time and a fourth characteristic of the enhanced audio signal at the second time satisfies the threshold, the third characteristic corresponding to the first characteristic, the fourth characteristic corresponding to the second characteristic.