Methods and apparatus for determining whether a media presentation device is in an on state or an off state using fuzzy scores and signature matches

A tangible machine readable storage medium comprising instructions that, when executed, cause a machine to at least:

• sum a plurality of contribution values corresponding to a first cycle to generate a first intermediate fuzzy score for the first cycle, wherein the contribution values are indicative of a state of a presentation device;
• store the first intermediate fuzzy score in a circular buffer having a plurality of intermediate fuzzy scores corresponding to respective cycles;
• combine the intermediate fuzzy scores of the circular buffer for a first time period to form a final fuzzy score;
• and
• determine whether a signature match occurred during the first time period.

An apparatus to determine a state of a presentation device, comprising:

• an analyzer to sum a plurality of contribution values corresponding to a first cycle to generate a first intermediate fuzzy score for the first cycle, the fuzzy contribution values being indicative of a state of a presentation device
• a circular buffer to store the first intermediate fuzzy score, the circular buffer having a plurality of intermediate fuzzy scores corresponding to respective cycles, the analyzer to combine the intermediate fuzzy scores of the circular buffer for a first time period to form a final fuzzy score;
• and
• the analyzer to determine whether a signature match occurred during the first time period.