High level
BQ
Sense
BQ
Low level
BQ
DPEQ
Control
+
+
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Software Overview
21
SLAU694 – December 2016
Copyright © 2016, Texas Instruments Incorporated
TAS5780M Evaluation Module
shows the Equalizer audio processing window. Both left and right channels have 12 filters
individually, which appear under the frequency graph. Each filter has quite a few different filter types and
can be turned on or off independently. All the changes to these filters are reflected in
. The
composite plot (red) shows the overall frequency response alteration applied to the incoming digital audio
data. The equalizers for left and right channels are configured independently by default, but they can be
ganged by selecting
Ganged
option.
Phase, Group Delay, Impulse Response
and Pole zero charts are
also available on the right side.
3.8.4
DEQ
The dynamic equalizer mixes the audio signals routed through two paths containing one BQ each based
upon the signal level detected by the sense path, as shown in
.
Figure 22. DEQ
Figure 23. DEQ Tuning Window
3.8.4.1
DEQ
The Energy simply tells the algorithm for how long to average the samples of audio before it determines
how it compares to the mixing thresholds. The shorter the time, the faster the mixer reacts to changes in
the input signal level. The longer the time, the slower the mixer reacts to changes in level.
The mixing of the two paths (low level and high level) is controlled by setting the Threshold Low and
Threshold High. When the averaged signal (as set by the Energy) is below the Threshold Low, the
dynamic mixer sends all of the audio through the low-level path. When the signal is above the Threshold
High, it is sent through the upper-level path. When the signal is between the two, it is mixed together by
the dynamic mixer.