Ideally, microphones should respond equally well to all frequencies across the normal range of human hearing, 20–20,000 Hz. When expressed in a graph that plots output in decibels against frequency, this response appears flat. Although manufacturers find a flat frequency response difficult to attain in large spaces they can come quite close to it in free-field applications, where direct sound predominates, as shown in Figure 4.1.
However, in the diffuse field, where reverberant sound dominates, rooms tend to absorb treble frequencies, and manufacturers ...
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