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How should I generate a rectone from the following Matlab code

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function S=recttone(F,FS,LEN,PHASE)
FS=8000;
S=recttone(440,FS,0.5,pi/4);
sound(0.9*S,FS);
frequency F, sampling frequency FS, Duration LEN in [sec]. PHASE is optional(phase shift). we can also use the following data.
  3 Comments
Jan
Jan on 25 Jan 2017
@Syed Izzatullah: There are no "following data" in your question.

Answers (2)

Soumya Saxena
Soumya Saxena on 27 Jan 2017
Edited: Soumya Saxena on 27 Jan 2017
To generate rectangular pulse, you may use the "rectangularPulse" function in symbolic Math Toolbox.
The following documentation has more details:
Rectangular waveforms can also be created using the " phased.RectangularWaveform" function in Phased Array System Toolbox.
In general, to create periodic pulse you can see the examples given here using the Signal Processing Toolbox:

Image Analyst
Image Analyst on 27 Jan 2017
Edited: Image Analyst on 27 Jan 2017
I don't know what rectone is. Looks like you're trying to call it recursively. If you just need to make a tone in a rectangular pulse and save it to a wav file, and play it, try this:
% Program to create a wave file with constant amplitude and pitch.
% Initialization / clean-up code.
clc; % Clear the command window.
close all; % Close all figures (except those of imtool.)
clear; % Erase all existing variables. Or clearvars if you want.
workspace; % Make sure the workspace panel is showing.
format long g;
format compact;
fontSize = 20;
% Create the filename where we will save the waveform.
folder = pwd;
baseFileName = 'Test_Wave.wav';
fullFileName = fullfile(folder, baseFileName);
fprintf('Full File Name = %s\n', fullFileName);
% Set up the time axis:
Fs = 12000;
duration = 1; % seconds.
t = 1 : duration * Fs; % 2 seconds
% Set up the period (pitch, frequency):
T = 13; % Constant pitch if you use this.
% T = linspace(25, 8, length(t)); % Pitch changes if you use this.
% Create the maximum amplitude:
Amplitude = 32767 * ones(1, length(t));
% Zero out the first and last third to make a rectangular pulse
third = round(length(t) / 3);
Amplitude(1:third) = 0;
Amplitude(end-third:end) = 0;
% Construct the waveform:
y = int16(Amplitude .* sin(2.*pi.*t./T));
% y = abs(int16(Amplitude .* sin(2.*pi.*x./T)));
% Plot the waveform:
plot(t, y, 'b-');
title('Waveform', 'FontSize', fontSize);
xlabel('Time', 'FontSize', fontSize);
ylabel('Y', 'FontSize', fontSize);
grid on;
% Enlarge figure to full screen.
set(gcf, 'units','normalized','outerposition',[0 0 1 1]);
fprintf('Writing file %s...\n', fullFileName);
% Write the waveform to a file:
audiowrite(fullFileName, y, Fs);
% Play the sound as many times as the user wants.
playAgain = true;
counter = 1;
while playAgain
% Play the sound that we just created.
fprintf('Playing file %s %d times...\n', fullFileName, counter);
player = audioplayer(y, Fs);
play(player);
% Ask user if they want to play the sound again.
promptMessage = sprintf('You have played the sound %d times.\nDo you want to play the sound again?', counter);
titleBarCaption = 'Continue?';
button = questdlg(promptMessage, titleBarCaption, 'Yes', 'No', 'Yes');
if strcmpi(button, 'No')
playAgain = false;
break;
end
counter = counter + 1;
end
% Alert user that we are done.
message = sprintf('Done playing %s.\n', fullFileName);
fprintf('%s\n', message);
promptMessage = sprintf('Done playing %s.\nClick OK to close the window\nor Cancel to leave it up.', fullFileName);
titleBarCaption = 'Continue?';
button = questdlg(promptMessage, titleBarCaption, 'OK', 'Cancel', 'OK');
if strcmpi(button, 'OK')
close all; % Close down the figure.
end

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