Patent ID: 6731762
Filing Date: 2004-05-04
Classification: H04R

Abstract:
A wireless microphone comprising:a housing; a circuit board mounted in said housing; a common conductor pair mounted on said circuit board, said common conductor pair including first and second conductors, each of which has a charging end and a connecting end; a charger circuit having a grounded first power terminal and a second power terminal; a transmitter circuit having a grounded first signal terminal and a second signal terminal; a first impedance coil having a grounded first coil terminal and a second coil terminal connected to said connecting end of said first conductor; a second impedance coil having a first coil terminal connected to said second power terminal, and a second coil terminal connected to said connecting end of said second conductor; a first isolation capacitor having a first capacitor terminal connected to said second signal terminal, and a second capacitor terminal connected to said connecting end of said second conductor; and at least a second isolation capacitor connected across said first and second conductors; wherein, when a direct current power signal is supplied to said charging ends of said first and second conductors, the power signal will be prevented from reaching said transmitter circuit by said first isolation capacitor and will be directed to said charger circuit by said second impedance coil; and wherein, when said transmitter circuit outputs a microphone pick-up signal for transmission, the microphone pick-up signal will be prevented from reaching said charger circuit by said first and second impedance coils and will be directed to said first and second conductors through said first and second isolation capacitors for wireless transmission by said first and second conductors.