User`s manual

128
4.6.2: Spectral Graphic Equalizer
Application:
For many output equalization requirements, the 20-Band Graphic Equalizer described in
Section 4.6.1: should be adequate. Its resolution is limited, having only 20 coarsely-spaced
slider controls; some applications require finer control of the output spectrum shape. For this
reason, the 115-band Spectral Graphic Equalizer is provided (a 460-band version is also
available as the Hi-Res Graphic Filter described in Section 4.4.13: ).
The Spectral Graphic Equalizer is essentially a 115-band graphic equalizer, but does not
have 115 separate slider controls. Rather, it allows the user to precisely draw the desired
equalizer shape on the computer screen, using the mouse, with as much or as little detail as
desired. Once the equalizer shape has been drawn, a linear-phase digital filter is created and
loaded into the digital equalizer stage for implementation.
The Edit feature allows the user to make adjustments to the equalizer shape, while the
Normalize button allows the user to shift the entire equalizer curve up until the highest point
is at 0dB.
A Store and Recall capability is also provided to allow the user to store commonly-used
equalizer shapes to disk memories so that they can be recalled later.
Description of operation:
The Spectral Graphic Equalizer operation is identical to the Hi-Res Graphic Filter of Section 4.4.13: ,
with the singular exception that its resolution is one-fourth as great. Please refer to this section for
operating instructions and illustrations.