Twice the power corresponds to a 3 decibel increase, so white noise is said to increase 3 dB per octave in power. Since each successive octave of frequency will have twice as many Hz in its range, the power in white noise will increase by a factor of two for each octave band. The ear is aware of a lot of high frequency sound in white noise since the ear is more sensitive to high frequencies. The sound of white noise is similar to the sound of steam escaping from an overheated steam boiler. The illustration above includes the entire standard audio frequency range.
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It is fairly easy to produce white noise - it is often produced by a random noise generator in which all frequencies are equally probable. It is described as "white" by analogy to white light, which is a mixture of all visible wavelengths of light. White noise is noise whose amplitude is constant throughout the audible frequency range.
Typically, white noise or pink noise is used. The sound system is then equalized to the room.įor processes of testing and equalizing rooms and auditoriums, it is convenient to have broad-band noise signals. With pink noise input, the equalizer is then adjusted to get a straight line output. A real-time analyzer can be set so that a pink noise input produces a straight horizontal line on its display. So if you put pink noise in and get pink noise out, you are close to that goal. The basic idea of room equalization is for the sound system to produce in the room exactly the same signal which is put into the system. The process of leveling out the frequency response of the sound system removes the peaks which will ring the system before sufficient gain is achieved. The process of equalizingan auditorium also improves the fidelity ofthe sound.
One of the most powerful tools for increasing the potential acoustic gain of a sound amplification system is the production of a "mirror image" filter to level the frequency response of the system. Equalization of Sound Systems Equalization