# v_lpcaa2dl

## PURPOSE

V_LPCAA2DL LPC: Convert area coefficients to dct of log area DL=(AA)

## SYNOPSIS

function dl=v_lpcaa2dl(aa)

## DESCRIPTION

    V_LPCAA2DL LPC: Convert area coefficients to dct of log area DL=(AA)

## CROSS-REFERENCE INFORMATION

This function calls:

- v_rdct V_RDCT Discrete cosine transform of real data Y=(X,N,A,B)

This function is called by:

## SOURCE CODE

    0001 function dl=v_lpcaa2dl(aa)
    0002 %V_LPCAA2DL LPC: Convert area coefficients to dct of log area DL=(AA)
    0003
    0004 % note: we do not correct for sinc distortion; perhaps we should multiply by
    0005 % k=1:p-1;s=[sqrt(0.5)/p 2*sin(pi*k/(2*p))./(pi*k)];
    0006
    0007
    0008
    0009 %      Copyright (C) Mike Brookes 1998
    0010 %      Version: $Id: v_lpcaa2dl.m 10865 2018-09-21 17:22:45Z dmb $
    0011 %
    0012 %   VOICEBOX is a MATLAB toolbox for speech processing.
    0013 %   Home page: http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/voicebox.html
    0014 %
    0015 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
    0016 %   This program is free software; you can redistribute it and/or modify
    0017 %   it under the terms of the GNU Lesser General Public License as published by
    0018 %   the Free Software Foundation; either version 3 of the License, or
    0019 %   (at your option) any later version.
    0020 %
    0021 %   This program is distributed in the hope that it will be useful,
    0022 %   but WITHOUT ANY WARRANTY; without even the implied warranty of
    0023 %   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    0024 %   GNU Lesser General Public License for more details.
    0025 %
    0026 %   You can obtain a copy of the GNU Lesser General Public License from
    0027 %   https://www.gnu.org/licenses/ .
    0028 %
    0029 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
    0030
    0031 [nf,p2]=size(aa);
    0032 dl=v_rdct(log(aa(:,2:p2-1)./aa(:,p2*ones(1,p2-2))).').';
    0033
    0034