Chapter 11

Filters and equalization





The word ‘equalization’ reflects its historical origin, from when its main function was to restore inadvertent changes to frequency response. These were among the biggest obstacles to be overcome as audio engineering has developed. Microphones still often introduce marked changes, differentially responding to the frequencies present. Acoustics, too, may require correction.

For television drama, a range of different microphones may have to be used to pick up a single voice as an actor moves around a set, and the varied responses must be matched to some standard, perhaps of a main boom microphone, or the transitions will be obtrusive. This demands a capacity for changing each microphone’s frequency response ...

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