Digital Signal Processing Reference
In-Depth Information
3.0
2.5
2.0
1.5
1.0
0.5
0.0
20.0
40.0
Pulse Locations
60.0
80.0
(a)
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
20.0
40.0
Pulse Locations
(b)
60.0
80.0
Figure 7.10
Distribution plots of MPLPC pulse locations with subframe size of 80
samples (a) The distribution of MPLPC pulse locations with no LTP, and (b) The
distribution of MPLPC pulse locations with LTP
The effect of the decimation ratio on the performance of RPELPC is shown in
Figure 7.11 for analysis frames of 40 and 80 samples with and without LTP.
The relative SNR differences are partly dependent on the speech material but,
generally, the inclusion of the LTP improves the performance of the RPELPC
especially at higher decimation ratios. As can be observed from the plot, the
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