lpc vocoder.clarification needed.pls

Hi

i'm using lpc vocoder for my speech recognition. If i'm doing only
alphabet A-Z, I only need the encoder part. Is that correct?

As i know, lpc vocoder determine the lpc analysis and pitch detector.
If i wan to get the coefficients only for my neural network
recognition, I dun need the pitch detector rite? The pitch detector
which is to detect voice, unvoiced is for the synthesis part.

So, if i cancel away the pitch detector part, it's equal to using lpc
method to determine coefficients rite?

Someone pls clarify me....i'm blur.
Thanks Alot!!.