![]() Typically specified in logarithmic units of dBV (decibels with respect to 1 V), it tells how many volts the output signal will be for a given SPL. The sensitivity of an analog microphone is straightforward and easy to understand. This reference point is but one characteristic of the microphone, by no means the whole story of its performance. The magnitude of the analog or digital output signal from the microphone with that input stimulus is a measure of its sensitivity. Microphone sensitivity is typically measured with a 1 kHz sine wave at a 94 dB sound pressure level (SPL), or 1 pascal (Pa) pressure. ![]() This article will discuss the distinction in sensitivity specifications between analog and digital microphones, how to choose a microphone with the best sensitivity for the application, and why adding a bit (or more) of digital gain can enhance the microphone signal. Mapping units in the acoustic domain to units in the electrical domain determines the magnitude of the microphone output signal, given a known input. ![]() Sensitivity, the ratio of the analog output voltage or digital output value to the input pressure, is a key specification of any microphone.
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