How to measure distance between speaker and microphone?

I am trying to compare two sounds: one obtained right next to the source of sound and the other at some distance. They are both saved as .fig files but I can't get correct distance and depending on the .fig file ssometimes I get errors in cell2mat function. I found solutions to the similar problem on the internet but I am not sure how to implement them into my code.

Here is my code for recording the sounds:

clc
clear all

load gong.mat;
gong = audioplayer(y, Fs);
t2=0:1/Fs:3-1/Fs;

recObj = audiorecorder(48000,24,1);
disp('Start speaking.');

play(gong);

recordblocking(recObj, 1);
disp('End of Recording.');

myRecording = getaudiodata(recObj);
s_length = length(myRecording);

fs=48000;
sampleTime = ( 1:s_length )/fs;

figure(1)
plot(sampleTime,myRecording);

and code for comparing results:

open sound1.fig 
D=get(gca,'Children'); 
XData=get(D,'XData'); 
YData=get(D,'YData'); 
Data=[XData' YData'];

open sound2.fig 
D2=get(gca,'Children'); 
XData2=get(D2,'XData'); 
YData2=get(D2,'YData'); 
Data2=[XData2' YData2']; 

%%
trshld  = 0.3;                  
pulse1 = find(hf3yd(1,:) < trshld);
pulse2 = find(hf3yd(2,:) < trshld);

Fs = 48000;                      
pl1 = length(pulse1);
pl2 = length(pulse2);
vlen = min(pl1, pl2);
pulsx = pulse1(1:vlen);         
pulsy = pulse2(1:vlen);
pulsxt = pulsx/Fs;              
pulsyt = pulsy/Fs;

PulsDt = pulsxt - pulsyt;       

PulsDtM = mean(abs(PulsDt));

distance=PulsDtM*340
fprintf(1,'\n\n\tDistance %.3f m\n\n', distance)

Answer 1

[Hamza HEBHOUB]

can you give the link of the solution that you found in the internet ?