Microphone interface, vehicle, connection method, and production method

A microphone interface, comprising:

• a connection terminal usable as an audio input terminal into which an audio signal is input or as a power supply terminal connected to a power supply;
• a ground side terminal provided on a ground side with respect to the connection terminal,
• wherein
• when a two-wire microphone is connected to the microphone interface, the connection terminal is used as the audio input terminal, and when a three-wire microphone is connected to the microphone interface, the connection terminal is used as the power supply terminal for supplying electric power to the three-wire microphone,
• the two-wire microphone comprises a plurality of single-ended input two-wire microphones,
• a first single-ended input two-wire microphone of the plurality of single-ended input two-wire microphones is connected to the connection terminal and the ground side terminal;
• the connection terminal is connected to the power supply via a first resistor,
• the ground side terminal is grounded,
• the microphone interface further includes:
• capacitors corresponding to the plurality of single-ended input two-wire microphones, the number of the plurality of single-ended input two-wire microphones is six;
• and
• analog digital converters connected to first ends of the capacitors,
• the connection terminal is connected to a second end of the capacitor corresponding to the first single-ended input two-wire microphone, and
• one end of the first resistor is connected to a node between the connection terminal and the second end of the capacitor corresponding to the first single-ended input two-wire microphone.

A microphone interface, comprising:

• a plurality of connection terminals including connection terminals usable as audio input terminals into which audio signals are input and connection terminals usable as power supply terminals connected to a power supply;
• a plurality of ground side terminals provided on a ground side with respect to the plurality of connection terminals;
• two spare power supply terminals connected to the power supply;
• and
• an analog digital converter,
• wherein
• four three-wire microphones are connected to the microphone interface,
• two of the four three-wire microphones are each connected to a corresponding one of the two spare power supply terminals, a connection terminal of the plurality of connection terminals used as an audio input terminal, and a ground side terminal of the plurality of ground side terminals, and
• another two of the four three-wire microphones are each connected to a connection terminal of the plurality of connection terminals used as a power supply terminal, a connection terminal of the plurality of connection terminals used as an audio input terminal, and a ground side terminal of the plurality of ground side terminals.