Voice activity detection

A voice activity detector, comprising:

• a first sensor in an environment to provide a primary signal;
• a second sensor in the environment to provide a reference signal;
• a detector configured to detect a condition of the environment;
• and
• a processor configured to:
• select a threshold value based upon the detected condition,
• compare the primary signal to the reference signal with respect to the selected threshold value, and
• selectively indicate that a user is speaking based at least in part upon the comparison.

A non-transitory computer readable medium having instructions encoded therein that, when processed by a suitable processor, cause the processor to perform a method comprising:

• receiving a primary signal from a first sensor in an environment;
• receiving a reference signal from a second sensor in the environment;
• detecting a condition in the environment;
• selecting a threshold based at least in part upon the detected condition;
• comparing the primary signal to the reference signal;
• and
• selectively indicating that a user is speaking based at least in part upon the comparison.