e_zoom.m

这是一个用于语音信号处理的工具箱

%Callback function for the zoom button by Karthik May 25 1997
%To zoom a segment of speech, click the left mouse button on the  beginning and end points
%To zoom out, click the left and right mouse buttons in any order(but not together)
%To exit the zooming function, click the right mouse button twice
%
%Modified by D. G. Childers
%
if exist('left_line_h') == 1
   clear left_line_h  right_line_h
end
figure(ana_wav_win_h);

  
AXIS = axis;
button = [1 1];
while button(1)~=3 | button(2)~=3
   [xx,yy,button] = ginput(2);
   xx=round(xx);
   if button(1)== 1 & button(2) ==1
      LEFT1(zoom_level) = LEFT;
      RIGHT1(zoom_level) = RIGHT;
      zoom_level = zoom_level + 1;
      if (xx(2)>xx(1))
         LEFT = round(xx(1));
         RIGHT = round(xx(2));
      else
         LEFT = round(xx(2));
         RIGHT = round(xx(1));
      end
      axis1 = LEFT:RIGHT;
      subplot(2,1,1);
      plot(axis1,SPEECH_OLD(LEFT:RIGHT));
      axis([LEFT RIGHT AXIS(3) AXIS(4)]);
      axis2=axis;
      subplot(2,1,2);      
      plot(SPEECH_OLD);
      hold on;
      plot([xx(1) xx(1)]);
      hold on;
      plot([xx(2) xx(2)]);
      hold on;
      axis([1 LEN AXIS(3) AXIS(4)]);
      


      
      elseif (button(1)==1 & button(2) ==3)|(button(1) == 3 & button(2) ==1)
      zoom_level = zoom_level -1;
      if zoom_level <=0
         zoom_level = 1;
      end;
      LEFT = LEFT1(zoom_level);
      RIGHT = RIGHT1(zoom_level);
      axis1 = LEFT:RIGHT;
      subplot(2,1,1);
      plot(axis1,SPEECH_OLD(LEFT:RIGHT));
      axis([LEFT RIGHT AXIS(3) AXIS(4)]);
      axis2=axis;
      subplot(2,1,2);
      plot(SPEECH_OLD);
      axis([1 LEN AXIS(3) AXIS(4)]);
      
   elseif button(1) ==3 & button(2) ==3
      if zoom_level==1
         figure(ana_wav_win_h);
         subplot(1,1,1);
         plot(SPEECH_OLD);
         LEFT=1;
         LEN=length(SPEECH_OLD);
         RIGHT=LEN;
      end;
      break;
   end
end;
clc;
SPEECH = SPEECH_OLD(LEFT:RIGHT);
disp('Exiting the zooming function');
clear xx 
return;