We can now assemble a set of band pass filters to analyse speech. These need to be covering - that is every frequency is covered by one filter so no information is lost.
An example of one filter is figure 10:
Figure 10: A band pass filter
The output is a waveform, but as the phase is not so important we need the magnitude or the energy - how?
If the filter bank is implemented as an FIR filter, a simple transform of the coefficients yields the phase shifted signal (use sine coefficients on instead of cosine coefficients).