| 摘要 |
A circuit board (80, 100, 120, 142) in a mobile electronic device (10) has a microphone (96, 110, 126) and related amplifier and signal conditioning circuitry mounted thereon. A radio frequency (RF) shield (94, 108, 122) surrounds and isolates the microphone from electromagnetic interference (EMI). The RF shield together with the circuit board forms an acoustic chamber (81, 101) surrounding the microphone. An opening (99) in the RF shield permits acoustic energy to enter the acoustic chamber and reach the microphone. |
