Abstract: A wireless joint includes a converter, a radio frequency (RF) device, and a connector. The converter realizes a conversion between an audio signal and a wireless signal. The RF device receives and transmits the wireless signal. The connector connects with a microphone body.

Abstract: A wireless joint includes a converter, a radio frequency (RF) device, and a connector. The converter realizes a conversion between an audio signal and a wireless signal. The RF device receives and transmits the wireless signal. The connector connects with a microphone body.

Abstract: An interface apparatus is capable of connecting with a plurality of external devices and an electronic device. The electronic device generates control signals and a selecting signal. The interface apparatus comprises a plurality of interface ports, an interface, a selection unit, and a switch. The interface ports connect with the external devices respectively. The interface controls the switch to establish a connection between the selection unit and the interface in response to the first control signal for transmitting the selecting signal to the selection unit. The selection unit selects the interface port corresponding to the selecting signal to connect with the switch. The interface further transmits information from the external device corresponding to the selected interface port to the electronic device through the switch and the interface in that order in response to the second control signal.

Abstract: An electronic device with two driving structures is capable of switching between a standby state and a working state. The electronic device includes a power supply, a processor and a driving circuit. The power supply is capable of outputting a first driving voltage or a second driving voltage. The processor detects whether the power supply outputs a first driving voltage and whether the electronic device receives a power-on instruction for powering on the electronic device. The processor outputs different controlling signals to control the driving circuit to output different voltages. The processor works in different states of different driving structures based on the received voltage outputted by the driving circuit.

Abstract: An electronic device includes a first circuit board, a second circuit board, and a third circuit board. A plurality of loads are mounted on the first circuit board, a plurality of direct current (DC) to DC converters are mounted on the second circuit board, and an alternating current (AC) to DC converter is mounted on the third circuit board. The first circuit board is electrically connected to the second circuit board, the DC to DC converters are configured to convert an input DC voltage from the third circuit board to a plurality of output DC voltages correspondingly, and the output DC voltages power the loads correspondingly. The electronic device separates the voltage-conversion processes from other working components, thus the electronic device is protected from electromagnetic interference.