ggits.m clc;clear;close all all; ; chos=0; possibility=6; while chos~=possibility, chos=menu('GYAN chos=menu( 'GYAN GANGA SRS', SRS' ,'-- Add sound from file --' ,'-- Add sound form microphone --', --' ,'-- Recognise Speech --' ,'-- Database Information --' ,'-Delete database --', --' ,'-- Exit --'); --' ); %---------------------------------------------------------------------% Add a new sound from files if chos==1, clc; [namefile,pathname]=uigetfile( '*.wav;*.au' '*.wav;*.au', ,'Select a new sound'); sound' ); if namefile~=0 pos = strfind(namefile, '.' '.'); ); ext = namefile(pos+1:end); if strcmp(ext,'au' strcmp(ext, 'au') ) [y,Fs,bits] = auread(strcat(pathname,namefile)); end if strcmp(ext,'wav' strcmp(ext, 'wav') ) [y,Fs,bits] = wavread(strcat(pathname,namefile)); end % if the input sound is not mono if size(y,2)==2 y=y(:,1); end classe = input('Insert input( 'Insert a class number (sound ID) that will be used for recognition:' ); if (exist('sound_database.dat' (exist( 'sound_database.dat' )==2) load('sound_database.dat' load( 'sound_database.dat' ,'-mat' '-mat'); ); if (Fs ~= samplingfrequency) || (bits ~= samplingbits) warndlg('Sampling warndlg( 'Sampling parameters do not match with parameters already present in database' ,' Warning ') ') else sound_number = sound_number+1; data{sound_number,1} = y; data{sound_number,2} = classe; data{sound_number,3} = pathname; data{sound_number,4} = namefile; save('sound_database.dat' save('sound_database.dat' ,'data' 'data', ,'sound_number' 'sound_number', ,'append'); append' ); msgbox('Sound msgbox( 'Sound added to database' ,'Database result', result' ,'help' 'help'); ); disp('Sound disp('Sound added to database' ); end else samplingfrequency = Fs; samplingbits = bits; sound_number = 1; data{sound_number,1} = y; data{sound_number,2} = classe; data{sound_number,3} = pathname; data{sound_number,4} = namefile;
save('sound_database.dat' ,'data','sound_number','samplingfrequency' ,'sampling bits'); msgbox('Sound added to database' ,'Database result','help'); disp('Sound added to database' ); end else warndlg('Input sound must be selected.' ,' Warning ') end end %---------------------------------------------------------------------% Add a new sound from microphone if chos==2 if (exist('sound_database.dat' )==2) load('sound_database.dat' ,'-mat'); message=('The following parameters will be used during recording:'); disp(message); message=strcat('Sampling frequency',num2str(samplingfrequency)); disp(message); message=strcat('Bits per sample',num2str(samplingbits)); disp(message); durata=input('Insert the duration of the recording (in seconds):'); micrecorder = audiorecorder(samplingfrequency,samplingbits,1); disp('Now, speak into microphone...' ); record(micrecorder,durata); while (isrecording(micrecorder)==1) disp('Recording...'); pause(0.5); end disp('Recording stopped.'); dtime=datestr(now); message=strcat('Your Attendence has been registered at:' ,dtime); disp(message); y = getaudiodata(micrecorder, 'uint8'); plot(y); classe = num2str(input( 'Insert your roll number:' )); sound_number = sound_number+1; data{sound_number,1} = y; data{sound_number,2} = classe; data{sound_number,3} = 'Microphone'; data{sound_number,4} = dtime; save('sound_database.dat' ,'data','sound_number','-append'); msgbox('Sound added to database' ,'Database result','help'); disp('Sound added to database' ); else durata = input('Insert the duration of the recording (in seconds):'); samplingfrequency = input( 'Insert the sampling frequency (22050 recommended):'); samplingbits = input('Insert the number of bits per sample (8 recommended):'); micrecorder = audiorecorder(samplingfrequency,samplingbits,1); disp('Now, speak into microphone...' ); record(micrecorder,durata); while (isrecording(micrecorder)==1)
disp('Recording...'); pause(0.5); end disp('Recording stopped.'); dtime=datestr(now); message=strcat('Your Attendence has been registered at:' ,dtime); disp(message); y = getaudiodata(micrecorder, 'uint8');plot(y); classe = input('Insert your roll number:' ); sound_number = 1; data{sound_number,1} = y; data{sound_number,2} = classe; data{sound_number,3} = 'Microphone'; data{sound_number,4} = dtime; save('sound_database.dat' ,'data','sound_number','samplingfrequency' ,'sampling bits'); msgbox('Sound added to database' ,'Database result','help'); disp('Sound added to database' ); end end %---------------------------------------------------------------------% % Speech Recognition from microphone if chos==3 if (exist('sound_database.dat' )==2) load('sound_database.dat' ,'-mat'); Fs = samplingfrequency; durata = input('Insert the duration of the recording (in seconds):'); micrecorder = audiorecorder(samplingfrequency,samplingbits,1); disp('Now, speak into microphone...' ); record(micrecorder,durata); while (isrecording(micrecorder)==1) disp('Recording...'); pause(0.5); end disp('Recording stopped.'); y = getaudiodata(micrecorder, 'uint8'); %----- code for speech recognition ------vettore_pesi = zeros(sound_number,1); D1 = specgram(y,512,Fs,512,384); disp('Database scanning...' ); for ii=1:sound_number D2 = specgram(data{ii,1},512,Fs,512,384); SM = simmx(abs(D1),abs(D2)); [p,q,C] = dp(1-SM); peso = C(size(C,1),size(C,2)); vettore_pesi(ii) = peso; message=strcat( 'Sound #',num2str(ii)); disp(message); end [min_value,min_index] = min(vettore_pesi); speech_id = data{min_index,2}; %----------------------------------------disp('Matching sound:'); message=strcat('File:',data{min_index,4}); disp(message);
message=strcat('Location:',data{min_index,3}); disp(message); message = strcat('Recognized speech ID: ' ,num2str(speech_id)); disp(message); msgbox(message,'Matching result','help'); else warndlg('Database is empty. No matching is possible.' ,' Warning ') end end %---------------------------------------------------------------------% Database Info if chos==4 clc; if (exist('sound_database.dat' )==2) load('sound_database.dat' ,'-mat'); message=strcat('Database has total- ',num2str(sound_number), ' entries.'); disp(message); disp(' '); for ii=1:sound_number message=strcat( 'Roll Number:',num2str(data{ii,2})); disp(message); message=strcat( 'Attendence Recorded at:' ,data{ii,4}); disp(message); disp('-'); end else warndlg('Database is empty.',' Warning ') end end %---------------------------------------------------------------------% Delete database if chos==5 clc; close all; if (exist('sound_database.dat' )==2) button = questdlg('Do you really want to remove the Database?' ); if strcmp(button,'Yes') delete('sound_database.dat' ); msgbox('Database was succesfully removed from the current directory.','Database removed','help'); end else warndlg('Database is empty.',' Warning ') end end %---------------------------------------------------------------------end
simmx.m function M = simmx(A,B) EA = sqrt(sum(A.^2)); EB = sqrt(sum(B.^2)); M = (A'*B)./(EA'*EB);
dp.m function [p,q,D] = dp(M) [r,c] = size(M); D = zeros(r+1, c+1); D(1,:) = NaN; D(:,1) = NaN; D(1,1) = 0; D(2:(r+1), 2:(c+1)) = M; % traceback phi = zeros(r,c); for i = 1:r; for j = 1:c; [dmax, tb] = min([D(i, j), D(i, j+1), D(i+1, j)]); D(i+1,j+1) = D(i+1,j+1)+dmax; phi(i,j) = tb; end end % Traceback from top left i = r; j = c; p = i; q = j; while i > 1 & j > 1 tb = phi(i,j); if (tb == 1) i = i-1; j = j-1; elseif (tb == 2) i = i-1; elseif (tb == 3) j = j-1; else error; end p = [i,p]; q = [j,q]; end % Strip off the edges of the D matrix before returning D = D(2:(r+1),2:(c+1));
