Home > voicebox > readcnx.m

readcnx

PURPOSE ^

READCNX Read a .CNX format sound file [Y,FS,H]=(FILENAME)

SYNOPSIS ^

function [y,fs,h]=readcnx(filename,mode)

DESCRIPTION ^

READCNX  Read a .CNX format sound file [Y,FS,H]=(FILENAME)

 Inputs:
           filename : character string containing filename (default extension .cnx)
           mode:    't' = trim leading and trailing silences
                    'h' = read header only
             'd'    Look in data directory: voicebox('dir_data')

 Outputs:
           y  : column vector containing waveform
           fs : sample frequency
           h  : parameter array:
                h(1) = number of samples in file
                h(2) = status: 0=good, 1=bad
                h(3) = start sample number
                h(4) = ending sample number
                h(5) = speaker identification number
                h(6) = speaker age group
                h(7) = speaker sex: 0=male, 1=female
                h(8) = ascii character
                h(9) = repetition number

 This is the format of the BT Connex-S1 alphabet database
 Note: the decoding is not particularly robust and assumes
       that all headers contain the same sequence of fields

CROSS-REFERENCE INFORMATION ^

This function calls: This function is called by:

SOURCE CODE ^

0001 function [y,fs,h]=readcnx(filename,mode)
0002 %READCNX  Read a .CNX format sound file [Y,FS,H]=(FILENAME)
0003 %
0004 % Inputs:
0005 %           filename : character string containing filename (default extension .cnx)
0006 %           mode:    't' = trim leading and trailing silences
0007 %                    'h' = read header only
0008 %             'd'    Look in data directory: voicebox('dir_data')
0009 %
0010 % Outputs:
0011 %           y  : column vector containing waveform
0012 %           fs : sample frequency
0013 %           h  : parameter array:
0014 %                h(1) = number of samples in file
0015 %                h(2) = status: 0=good, 1=bad
0016 %                h(3) = start sample number
0017 %                h(4) = ending sample number
0018 %                h(5) = speaker identification number
0019 %                h(6) = speaker age group
0020 %                h(7) = speaker sex: 0=male, 1=female
0021 %                h(8) = ascii character
0022 %                h(9) = repetition number
0023 %
0024 % This is the format of the BT Connex-S1 alphabet database
0025 % Note: the decoding is not particularly robust and assumes
0026 %       that all headers contain the same sequence of fields
0027 
0028 %       Copyright (C) Mike Brookes 1998
0029 %      Version: $Id: readcnx.m 713 2011-10-16 14:45:43Z dmb $
0030 %
0031 %   VOICEBOX is a MATLAB toolbox for speech processing.
0032 %   Home page: http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/voicebox.html
0033 %
0034 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
0035 %   This program is free software; you can redistribute it and/or modify
0036 %   it under the terms of the GNU General Public License as published by
0037 %   the Free Software Foundation; either version 2 of the License, or
0038 %   (at your option) any later version.
0039 %
0040 %   This program is distributed in the hope that it will be useful,
0041 %   but WITHOUT ANY WARRANTY; without even the implied warranty of
0042 %   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
0043 %   GNU General Public License for more details.
0044 %
0045 %   You can obtain a copy of the GNU General Public License from
0046 %   http://www.gnu.org/copyleft/gpl.html or by writing to
0047 %   Free Software Foundation, Inc.,675 Mass Ave, Cambridge, MA 02139, USA.
0048 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
0049 
0050 ix=[17 71; 18 0; 19 0; 10 0; 12 0; 13 77; 15 -1; 16 0; ];
0051 
0052 if nargin<2  mode='0'; end 
0053 if any(mode=='d')
0054     filename=fullfile(voicebox('dir_data'),filename);
0055 end
0056 fid=fopen(filename,'rb','l');
0057 if fid == -1
0058     fn=[filename,'.cnx'];
0059     fid=fopen(fn,'rb','l');
0060     if fid ~= -1 filename=fn; end
0061 end
0062 if fid == -1 error(sprintf('Can''t open %s for input',filename)); end
0063 [hdr,n]=fread(fid,512,'uchar');
0064 if n ~= 512 error(sprintf('Can''t read header from connex file %s',filename)); end
0065 del=find(hdr(5:end)=='|')';
0066 fs=sscanf(char(hdr(17:del(1)+3)),'%f');
0067 h=zeros(size(ix,1),1);
0068 for i=1:length(h)
0069     e=find(hdr(del(ix(i)-1)+5:del(ix(i))+3)=='=');
0070     if ix(i,2)
0071         h(i)=hdr(del(ix(i)-1)+e+5);
0072         if ix(i,2)>0
0073             h(i)=1-(h(i)==ix(i,2));
0074         end
0075     else
0076         h(i)=sscanf(char(hdr(del(ix(i)-1)+e+5:del(ix(i))+3)),'%d');
0077     end
0078 end
0079 if any(mode =='h')
0080     y=[];
0081 elseif any(mode =='t')
0082     fseek(fid,2*h(2),0);
0083     [y,n]=fread(fid,h(3)-h(2)+1,'short');
0084     if n ~= h(3)-h(2)+1 error(sprintf('Error reading data from connex file %s',filename)); end
0085 else
0086     y=fread(fid,inf,'short');
0087 end
0088 fseek(fid,0,1);
0089 h=[ftell(fid)/2-256; h];
0090 fclose(fid);

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