Methods and apparatus for automatic TV on/off detection

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

• determine respective counts for a plurality of measurements during a calibration period, the measurements indicative of an amount of power drawn by a device, the counts indicating respective numbers of times the respective measurements were detected;
• determine a first threshold and a second threshold based on at least one of the counts, the first threshold determined using most frequently logged measurement values, the most frequently logged measurement values based on counts performed after expiration of the calibration period;
• compare a measurement to the first threshold and to the second threshold;
• and
• store an indication that the device is in an indeterminate state if the measurement is greater than the first threshold and less than the second threshold.

A method to detect a power state of a device, the method comprising:

• determining, by executing an instruction with a processor, respective counts for a plurality of measurements during a calibration period, the measurements indicative of an amount of power drawn by the device, the counts indicating respective numbers of times the respective measurements were detected;
• determining a first threshold and a second threshold based on at least one of the counts, the first threshold determined using most frequently logged measurement values, the most frequently logged measurement values based on counts performed after expiration of the calibration period;
• comparing a measurement to the first threshold and to the second threshold;
• and
• storing an indication that the device is in an indeterminate state if the measurement is greater than the first threshold and less than the second threshold.