ELECTROMAGNETIC SHIELDING AND AN ACOUSTIC CHAMBER FOR A MICROPHONE IN A MOBILE ELECTRONIC DEVICE

摘要

A circuit board in a mobile electronic device has a microphone and related amplifier and signal conditioning circuitry mounted thereon. A radio frequency (RF) shield surrounds and isolates the microphone from electromagnetic interference (EMI). The RF shield together with the circuit board forms an acoustic chamber surrounding the microphone. A hole in the RF shield permits acoustic energy to enter the acoustic chamber and reach the microphone.