The purpose of this step is to shape the frequency response of the speaker output by
lowering the low frequency (<1 kHz) and enhancing the high frequency parts (1-3
kHz).
Note: This is an optional step.
This helps in reducing the echo reverberation within the speaker phone/car kit housing,
so that the linearity of the echo coupled to the MIC input can be better, which is
highly associated with the AEC performance. The following figure illustrates an example
of these settings, which are obtained empirically. However, the required frequency
changes depending on the selected speaker and housing.Figure 5-3. Example of the Frequency
Shaping for Signal at Speaker Path
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