Patent ID: 7729500

Claim:
A microphone array, comprising: a circuit board comprising a first layer, a third layer, and a second layer sandwiched between the first layer and the third layer, wherein the first layer comprises a first shielding part with a fixed electric potential, the third layer comprises a second shielding part with the fixed electric potential, and the second layer comprises an electrically conductive part running between the first and second shielding parts; a first microphone attached to the first layer of the circuit board; and a second microphone attached to the first layer of the circuit board and electrically connected to the first microphone through the electrically conductive part of the second layer of the circuit board, wherein the first microphone comprises a first shielding housing electrically connected to the first shielding part, and the second microphone comprises a second shielding housing also electrically connected to the first shielding part.