Creating Infinite Continuous Smooth Sound
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Hi,
I wish to create an infinite continuous sound, with no breaks or any other sound other than the audio itself.
Stopping the sound is not an issue for now.
The sound will be produced for example - from a sinusoidal signal, which is built from a certain frequency and length.
I've seen a few other questions on this topic(e.g. "How to produce a continuous sound?") , but none worked smooth for me, so I hope I'll find a solution here.
The first approach I tried is using the "sound" function, like so:
Fs = 44100; % Sample rate (samples per second)
duration = 3; % Duration of each tone in seconds
frequency = 440; % Frequency of the tone in Hz
t = 0:1/Fs:duration;
tone = sin(2*pi*frequency*t);
while true
sound(tone, Fs);
pause(3)
end
The second approach I tried is using the DSP System Toolbox package, like so:
Fs = 44100; % Sample rate (samples per second)
duration = 3; % Duration of each tone in seconds
frequency = 440; % Frequency of the tone in Hz
t = 0:1/Fs:duration;
y = sin(2*pi*frequency*t);
audio_file_name = 'audio_file.wav';
audiowrite(audio_file_name,y,Fs);
hafr = dsp.AudioFileReader(audio_file_name);
hap = audioDeviceWriter('SampleRate',48000);
while true
while ~isDone(hafr)
audio = step(hafr);
step(hap,audio);
end
reset(hafr)
end
Both of those approaches do produce a continuous sound, but not a smooth one, as in between iterations there is a small intermisson.
I hope there is a simple solution to this.
Thank you!
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Answers (1)
Voss
on 20 Feb 2024
Edited: Voss
on 20 Feb 2024
In order to avoid that "small intermission" or slight interruption between iterations, the signal must have a smoothly varying phase across the iteration transition. In this case, that can be done by constructing your signal with one fewer sample at the end so that you're not repeating that sample when the next sound starts:
Fs = 44100; % Sample rate (samples per second)
duration = 3; % Duration of each tone in seconds
frequency = 440; % Frequency of the tone in Hz
% t = 0:1/Fs:duration;
t = (0:duration*Fs-1)/Fs; % one fewer sample at the end
tone = sin(2*pi*frequency*t);
while true
sound(tone, Fs);
pause(duration) % (use the duration variable instead of hard-coding 3)
end
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