time recording problem with matlab

hello,

I am trying to record my voice using the codes below:

% Before starting, we will use the following commands 
clear all       % clear all workspace variables
close all       % close all open figures
clc             % clear command window

% Speech synthesis (recording and saving audio signal) and loading into
% matlab

% Input paramters (default values)
fs= 16000;             % sample frequency
nobits = 8;           % number of bits per sample 
nochannels = 1;       % number of channels (mono)
x = audiorecorder(fs, nobits, nochannels); 
get(x);

x = audiorecorder;
disp('Start speaking.')
recordblocking(x, 3);
disp('End of Recording.');

% Play audio signal 
play(x);

% Save data (double precision array) 
x = getaudiodata(x);

% Save recorded signal as an audio file with "wav" extention (type of file)
audiowrite ('x.wav', x,fs)

% Codes to asnwer questions (1-4) of (5.Problem Statement)

% 1. Code to find sample rate of the audio signal
% Read (download) audio file into matlab  
[x,fs] = audioread('x.wav');

for some reasons, the recorded audio file is less than 3 seconds and when I play it using real player it only last for 1.5 seconds,

The strange thing is that the codes and recorded signal are working properly with Fs= 8000 Hz. Could anyone help me with this issue?

Thank a lot and I really appreciate quick response as I have to submit my project tomorrow.

[Jan]

Your question is funny. You try to push the voluntary helpers, because you started to solve the problems very late. ;-) Of course, I have been almost too late many times also, but I did not publish this in the forum.

Answer 1

[Jan]

What is the meaning of these lines:

x = audiorecorder(fs, nobits, nochannels); 
get(x);
x = audiorecorder;

You create an audiorecorder object, get its properties but do neither display or use them. Then get(x) is only a waste of time? And inthe next line you overwrite the obejct by a new audiorecorder object, which uses the default values?

The default frequency of the audiorecorder obejct is 8000Hz. Do you recognize this value? It could be a solution, simply to remove the strange lines:

get(x);
x = audiorecorder;

;-) Note: Strange commands have strange effects. If the program produces stranger results than it should, avoid strange commands.

[Dana Alsalman]

Jan Simon. Thanks a lot sir, I was able to solve the problem. I really appreciate it if you can also help me write the matlab codes to find the bandwidth and the Nyquist rate of my signal