# v_lpccw2zz

## PURPOSE

V_LPCPZ2ZZ LPC: Power spectrum roots to LPC poles ZZ=(CW)

## SYNOPSIS

function zz=v_lpccw2zz(cw)

## DESCRIPTION

    V_LPCPZ2ZZ LPC: Power spectrum roots to LPC poles ZZ=(CW)
     pz are the roots of the power spectrum polynomial pp(cos(w))

## CROSS-REFERENCE INFORMATION

This function calls:

This function is called by:

## SOURCE CODE

    0001 function zz=v_lpccw2zz(cw)
    0002 %V_LPCPZ2ZZ LPC: Power spectrum roots to LPC poles ZZ=(CW)
    0003 % pz are the roots of the power spectrum polynomial pp(cos(w))
    0004
    0005 %      Copyright (C) Mike Brookes 1998
    0006 %      Version: $Id: v_lpccw2zz.m 10865 2018-09-21 17:22:45Z dmb $
    0007 %
    0008 %   VOICEBOX is a MATLAB toolbox for speech processing.
    0009 %   Home page: http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/voicebox.html
    0010 %
    0011 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
    0012 %   This program is free software; you can redistribute it and/or modify
    0013 %   it under the terms of the GNU Lesser General Public License as published by
    0014 %   the Free Software Foundation; either version 3 of the License, or
    0015 %   (at your option) any later version.
    0016 %
    0017 %   This program is distributed in the hope that it will be useful,
    0018 %   but WITHOUT ANY WARRANTY; without even the implied warranty of
    0019 %   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    0020 %   GNU Lesser General Public License for more details.
    0021 %
    0022 %   You can obtain a copy of the GNU Lesser General Public License from
    0023 %   https://www.gnu.org/licenses/ .
    0024 %
    0025 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
    0026
    0027 zs=sqrt(cw.^2-1);
    0028 zz=cw-sign(real(conj(cw).*zs)).*zs;