A microphone is a device which converts sound waves to electrical impulses. High quality microphones usually generate a very low signal level. Low noise, high fidelity pre-amplification is required to boost the output of a microphone before the signal reaches the main audio amplifier where it is processed as a regular audio signal. Pre-amplifying low level microphone signals may be achieved by precise matching of microphone impedance and use of low noise electronic amplifying devices. Some microphones (mainly condenser type) need DC power in order to operate (phantom voltage) even before connecting to the amplification circuitry.
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