ATEIS IDA8 User Manual

Page 458

ATEIS - IDA8

458

Description

GEQ is the abbreviation of Graphic Equalizer. In the Graphic Equalizer the input signal is sent to a
bank of filters. Each filter passes the portion of the signal present in its own frequency range or
band. The amplitude passed by each filter is adjusted using a slider in the control window of Ateis
Studio control to boost or cut frequency components passed by that filter. The vertical position of
each slider thus indicates the gain applied at that frequency band.

The number of frequency channels (and therefore each one's bandwidth) affects the consuming DSP
power of audio processor and may be matched to the requirements of the intended application. An
equalizer for professional live sound reinforcement typically has some 25 to 31 bands for more
precise control of feedback problems and equalization of room modes. There are three types of
GEQ, 1 Octave, 2/3 Octave and 1/3 Octave. 1/3 Octave GEQ is spoken informally as "third-octave
EQ" because the center frequency of its filters are spaced one third of an octave apart with three
filters to an octave. Equalizers with half as many filters per octave are common where there is less
precise control and is called a 2/3-octave equalizer, and the 1 Octave GEQ is one filter to an octave.

Control Window:

Element Properties:

Name

Initial

Minimum Maximum Precision

Unit

Bypass all

Off

Bypass

Off

Gain

-30.0

15.0

0.1

Element Description:

Bypass all:

Bypasses the EQ (all the frequency bands).

Bypass:

Bypasses only the selected frequency band.

Gain:

Sets the gain of the selected frequency band.

Graphical Control Window