Noise is expressed by the equivalent noise level. Sometimes it sounds darker, other times it sounds lighter – all depending on the type of microphone and its design. When we amplify it, we can hear that it sometimes sounds "smooth”, other times it sounds more "crackling”. However, the character of the noise may differ, depending on the distribution of the noise. We call it "noise" because there are no tones in the signal. Just as white light contains the whole spectrum of visible light, white noise contains an equal amount of energy at all audio frequencies. The name "white noise" comes from comparing audio to light. The basic nature of the noise is what we call white noise. The movement of air molecules causes a bombardment on the diaphragm, which eventually ends up as noise.
Also, thermal noise (or "Johnson noise") is an issue the higher temperature, the higher the noise.įurther, noise is generated due to the presence of air around the microphone.
Primarily this noise originates from a current running in the circuitry (so-called "shot noise" or "Poisson noise"). However, there is always some portion of noise generated by the microphone itself – self-noise. Noise is not something we want to hear from a microphone. You will find data quantifying the "equivalent noise level”, which describes what goes on at the bottom of the microphone’s dynamic range – basically in the range of low SPLs. Unfortunately, completely free is impossible! To prepare for a good audio result, you should check the microphone's noise specifications. When we use a microphone, we expect the cleanest possible signal, ideally completely free of annoying noise.
0 kommentar(er)
