Patent ID: 8340735
Filing Date: 2012-12-25
Classification: H04M,H05K

Abstract:
1. A mobile electronic device, comprising: a housing having an opening for entry of acoustic energy into said housing; radio frequency ‘RF’ circuitry secured inside said housing and capable of producing electromagnetic emission; a circuit board secured inside said housing; an audio system comprising a microphone mounted on said circuit board; a radio frequency ‘RF ’ shield that is mechanically and electrically coupled to said circuit board and surrounds said microphone, said RF shield to provide some electromagnetic interference ‘EMI’ isolation for said microphone from at least said electromagnetic emission; an acoustic chamber surrounding said microphone, said acoustic chamber enclosed within said RF shield and bounded by said circuit board, wherein said RF shield has an opening to permit said acoustic energy to enter said acoustic chamber and wherein said acoustic energy, after entering said acoustic chamber through said opening in said RF shield, is able to propagate throughout said acoustic chamber; and an acoustic coupler to conduct said acoustic energy from said opening in said housing to said opening in said RF shield, wherein said acoustic coupler is an acoustic tube extending from said opening in said housing to said opening in said RF shield, and said acoustic tube is fastened to said RF shield or to said housing using a fastening ring.