In
audio processing, equalization (or equalisation, EQ) is the process of changing the frequency envelope of a
sound. In passing through any
channel, temporal/frequency spreading of a signal occurs.
Etymologically, it means to correct, or make equal, the
frequency response of a signal. The term "equalizer" is often incorrectly applied as a general term for
audio filters.
DJ mixing equipment and
hi-fi audio components often include so called graphic equalizers/equalizers or simply equalizer/equalizer. These are in fact general all-purpose filters, which can be arranged to produce the effect of
low pass,
high pass,
band pass and
band stop filters. Only when these filters are arranged so as to reverse the effects of the internal circuitry on sound output, are they operating as equalizers.
Parametric EQ was introduced by
George Massenburg in 1972 in his
AES paper.
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