At the company's five recycling centers across Japan, Fujitsu collects, disassembles, sorts, and recycles personal computers and other products.

ENGADGET: Fujitsu making laptops from unwanted CDs and DVDs

Mr Bouchaud is finding more than one MEMS microphone inside ever more of the products he disassembles, and these extra mikes are often being used to add noise-cancelling features.

ECONOMIST: Noise-cancelling technology