Akustica, based in Pittsburgh, Pennsylvania, puts a MEMSmicrophone complete with the circuitry needed for digital output into a package less than 5mm square.
Mr Bouchaud is finding more than one MEMSmicrophone inside ever more of the products he disassembles, and these extra mikes are often being used to add noise-cancelling features.
The Digital Silence DS-421D headset is also fitted with a Wolfson WM7130 MEMSmicrophone in each ear bud to pick up the ambient noise around the user prior to cancellation.