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[[File:Celp decoder.svg|300px|thumb|Figure 1: CELP decoder]]
Before exploring the complex encoding process of CELP we introduce the decoder here. Figure 1 describes a generic CELP decoder. The excitation is produced by summing the contributions from an adaptive (aka pitch) codebook and a stochastic (aka innovation or fixed) codebook:
:<math>e[n]=e_a[n]+e_f[n]\,</math>
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