RH2RG Calculates all the filters from the synthesis lowpass
in the orthogonal case.
[RH,RG,H,G]=RH2RG(RH) begins with the synthesis lowpass
filter (RH) and returns the synthesis highpass filter (RG),
the analysis lowpass filter (H) and the analysis highpass
filter (G).
It is an auxiliary function for orthogonal filters design.
$Id: rh2rg.m,v 1.1 2004/09/26 04:00:24 matthewbrett Exp $0001 function [rh,rg,h,g]=rh2rg(rh) 0002 0003 %RH2RG Calculates all the filters from the synthesis lowpass 0004 % in the orthogonal case. 0005 % 0006 % [RH,RG,H,G]=RH2RG(RH) begins with the synthesis lowpass 0007 % filter (RH) and returns the synthesis highpass filter (RG), 0008 % the analysis lowpass filter (H) and the analysis highpass 0009 % filter (G). 0010 % 0011 % It is an auxiliary function for orthogonal filters design. 0012 % 0013 % $Id: rh2rg.m,v 1.1 2004/09/26 04:00:24 matthewbrett Exp $ 0014 0015 %-------------------------------------------------------- 0016 % Copyright (C) 1994, 1995, 1996, by Universidad de Vigo 0017 % 0018 % 0019 % Uvi_Wave is free software; you can redistribute it and/or modify it 0020 % under the terms of the GNU General Public License as published by the 0021 % Free Software Foundation; either version 2, or (at your option) any 0022 % later version. 0023 % 0024 % Uvi_Wave is distributed in the hope that it will be useful, but WITHOUT 0025 % ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 0026 % FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 0027 % for more details. 0028 % 0029 % You should have received a copy of the GNU General Public License 0030 % along with Uvi_Wave; see the file COPYING. If not, write to the Free 0031 % Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. 0032 % 0033 % Author: Nuria Gonzalez Prelcic 0034 % e-mail: Uvi_Wave@tsc.uvigo.es 0035 %-------------------------------------------------------- 0036 0037 % Calculate rg from rh. 0038 0039 for i=1:length(rh) 0040 rg(i) = -(-1)^i*rh(length(rh)-i+1); 0041 end 0042 0043 % Calculate h and g 0044 0045 h=rh(length(rh):-1:1); 0046 g=rg(length(rg):-1:1);