Mikrofon-forforstærker med polariseringsspændingsforsyning

A system (1) of at least one microphone (2) and a remote signal analyzer (3) connected to the microphone (2) with two wires (5, 6) to transmit an audio signal (U aud ) back to the analyzer (3) and to receive a constant input current (I in ) on one of the wires (5) from the analyzer (3), which microphone (2) comprises an acoustic sensor (7) and a pre-amplifier (9) powered with the constant input current (I in ) to amplify the audio signal (U aud ) from the acoustic sensor (7), wherein the microphone (2) comprises a polarization voltage supply (8) connected to the two wires (5, 6) to polarize the microphone (10), which polarization voltage supply (8) comprises: a transformation stage (11) to transform a partial part of the constant input current (I in ) on the one wire (5) from the remote signal analyzer (3) into an output voltage (U stab ) with a first voltage level and a voltage increaser stage (12) to increase the voltage level of the output voltage (U stab ) into an increased output voltage (U high ) with a second voltage level and a noise reduction stage (13) to provide a polarization voltage (U pol ) to the acoustic sensor (7).