Digital Signal Processing Reference
In-Depth Information
0.8
0.6
0.4
0.2
0.0
−
4.0
−
2.0
0.0
Normalized variance
(a)
2.0
4.0
1.2
1.0
0.8
0.6
0.4
0.2
0.0
4.0
2.0
0.0
Normalized variance
(b)
2.0
4.0
−
−
Figure 7.9
Distribution plot of MPLPC pulse amplitudes (a) The distribution of MPLPC
pulses with no LTP, and (b) The distribution of MPLPC pulses with LTP
lowers the coding efficiency. The disadvantage with large subframe sizes is
that the complexity is increased.
RPELPC
As described earlier, RPELPC is similar to MPLPC except that the pulse
locations are pre-structured. The amount of structuring obviously determines
the amount of freedom that the pulses have in estimating the reference signal.
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