Linear filtering for noise-suppressed speech detection

Tangible, non-transitory, computer-readable media storing instructions executable by one or more processors to cause a network device to perform operations comprising:

• capturing, via a plurality of microphones of a network device, (i) a first audio signal via a first microphone of the plurality of microphones and (ii) a second audio signal via a second microphone of the plurality of microphones, wherein the first audio signal comprises first noise content from a noise source and the second audio signal comprises second noise content from the noise source;
• identifying the first noise content in the first audio signal;
• using the identified first noise content to determine an estimated noise content captured by the plurality of microphones;
• using the estimated noise content to suppress the first noise content in the first audio signal and the second noise content in the second audio signal;
• combining the suppressed first audio signal and the suppressed second audio signal into a third audio signal;
• and
• determining a probability that the first audio signal comprises speech content,
• wherein the steps of (i) identifying the first noise content in the first audio signal and (ii) using the identified first noise content to determine the estimated noise content captured by the plurality of microphones are carried out based on the determined probability being below a speech threshold probability, and
• wherein the first and second microphones are disposed along a housing of the network device and separated from one another by a distance that is greater than about five centimeters.

A method comprising:

• capturing, via a plurality of microphones of a network device, (i) a first audio signal via a first microphone of the plurality of microphones and (ii) a second audio signal via a second microphone of the plurality of microphones, wherein the first audio signal comprises first noise content from a noise source and the second audio signal comprises second noise content from the noise source;
• identifying the first noise content in the first audio signal;
• using the identified first noise content to determine an estimated noise content captured by the plurality of microphones;
• using the estimated noise content to suppress the first noise content in the first audio signal and the second noise content in the second audio signal;
• combining the suppressed first audio signal and the suppressed second audio signal into a third audio signal;
• and
• determining a probability that the first audio signal comprises speech content,
• wherein the steps of (i) identifying the first noise content in the first audio signal and (ii) using the identified first noise content to determine the estimated noise content captured by the plurality of microphones are carried out based on the determined probability being below a speech threshold probability, and
• wherein the first and second microphones are disposed along a housing of the network device and separated from one another by a distance that is greater than about five centimeters.