Wearable device with blocked sensor detection

A method for audio signal processing in a wearable device, the method comprising:

• receiving, at a first sensor included in the wearable device, a first audio signal;
• receiving, at a second sensor included in the wearable device, a second audio signal;
• determining a gain difference between an energy of the first audio signal and an energy of the second audio signal in a frequency range;
• applying a gain to the first audio signal to effectively compensate for the gain difference and form a scaled first audio signal;
• determining an energy of the scaled first audio signal in the frequency range;
• determining a scaled sum that comprises the energy of the scaled first audio signal and the energy of the second audio signal;
• and
• determining a scaled difference between the scaled first audio signal and the second audio signal;
• and
• determining a condition of the wearable device, comprising:
• determining a sum of the energy of the first audio signal and the energy of the second audio signal in the frequency range;
• determining a difference between the energy of the first audio signal and the energy of the second audio signal in the frequency range;
• determining a first ratio using the sum of the energy of the first audio signal and the second audio signal and the difference between the energy of the first audio signal and the energy of the second audio signal;
• determining a second ratio using the scaled sum and the scaled difference;
• determining a third ratio using the first ratio and the second ratio;
• and
• determining that the condition of the wearable device is blocked when at least one of:
• the gain is above a gain threshold,
• the scaled difference is less than the difference between the energy of the first audio signal and the energy of the second audio signal by an energy threshold, or
• the third ratio is greater than a ratio threshold.

A non-transitory computer-readable medium comprising computer-executable instructions that, when executed by one or more processors of a wearable device, cause the wearable device to perform a method for audio signal processing, the method comprising:

• receiving, at a first sensor included in the wearable device, a first audio signal;
• receiving, at a second sensor included in the wearable device, a second audio signal;
• determining a gain difference between an energy of the first audio signal and an energy of the second audio signal in a frequency range;
• and
• applying a gain to the first audio signal to effectively compensate for the gain difference and form a scaled first audio signal;
• determining an energy of the scaled first audio signal in the frequency range;
• determining a scaled sum that comprises the energy of the scaled first audio signal and the energy of the second audio signal;
• and
• determining a scaled difference between the scaled first audio signal and the second audio signal;
• and
• determining a condition of the wearable device, comprising:
• determining a sum of the energy of the first audio signal and the energy of the second audio signal in the frequency range;
• determining a difference between the energy of the first audio signal and the energy of the second audio signal in the frequency range;
• determining a first ratio using the sum of the energy of the first audio signal and the second audio signal and the difference between the energy of the first audio signal and the second audio signal;
• determining a second ratio using the scaled sum and the scaled difference;
• determining a third ratio using the first ratio and the second ratio;
• and
• determining that the condition of the wearable device is blocked when at least one of:
• the gain is above a gain threshold,
• the scaled difference is less than the difference between the energy of the first audio signal and the second audio signal by an energy threshold, or
• the third ratio is greater than a ratio threshold.