Multi channel voice activity detection

A system comprising:

• data processing hardware of a user device;
• and
• memory hardware in communication with the data processing hardware, the memory hardware storing instructions that when executed on the data processing hardware cause the data processing hardware to perform operations comprising:
• receiving, a sequence of input frames characterizing streaming multi-channel audio captured by an array of microphones in communication with the data processing hardware, each channel of the streaming multi-channel audio comprising respective audio features captured by a separate dedicated microphone in the array of microphones;
• determining, using a location fingerprint model, a location fingerprint indicating a location of a source of the multi-channel audio relative to the user device based on the respective audio features of each channel of the multi-channel audio;
• generating, as output from an application-specific classifier configured to receive the location fingerprint as input, a first score indicating a likelihood that the multi-channel audio corresponds to a particular audio type that a particular application is configured to process;
• and
• determining whether to accept or reject the multi-channel audio for processing by the particular application based on the first score generated as output from the application-specific classifier.