|
A microphone is a transducer that changes sound into electrical signals (varying current in a wire).
This electrical signal can either be sent directly to an amplifier and played back through a loudspeaker or it can be encoded into digital form and sent as a phone message.
A moving coil microphone works like a loudspeaker working backwards. The sound waves make the diaphragm move. Because the wire is moving near to a magnet, this induces a current in the wire. This effect is called electromagnetic induction.
|
