how do i generate sound using MATLAB?
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I want to generate and play *sound for frequencies 100Hz and 200Hz tones for 10 sec and 5 sec respectively using MATLAB With sampling frequency as 20500 Hz .Also i want to plot their frequecy spectrum* .Is it possible to do this using MATLAB?
采纳的回答
Azzi Abdelmalek
2014-6-14
4 个投票
7 个评论
ramdas patil
2014-6-14
Azzi Abdelmalek
2014-6-14
编辑：Azzi Abdelmalek
2014-6-14
amp=10
fs=20500 % sampling frequency
duration=10
freq=100
values=0:1/fs:duration;
a=amp*sin(2*pi* freq*values)
sound(a)
Image Analyst
2014-6-14
ramdas, it was tagged as homework. If it's homework you can't just ask someone to do it all for you. If it's not homework, say so.
ramdas patil
2014-6-14
Yonas Gedamu
2021-2-8
how to get amplitude. amplitude is not given? could you help me?
Image Analyst
2021-2-8
@Yonas Gedamu, Start a new question after you read this:
Then we'll know how to answer you precisely. Right now you have not given enough information. Not given from where? Who told you to do this? Amplitude in the spectral domain or the time domain, etc. I should know how to help you after you provide us the context - background information and any data you already have.
Adam Danz
2021-2-17
sound(a)
should be
sound(a,fs)
I don't have access to the 2014 documentation so I don't know what the inputs were for this function back then.
更多回答（2 个）
Image Analyst
2014-6-14
4 个投票
See my attached demo that creates a sound and plays it.
5 个评论
Image Analyst
2014-6-14
Have you tried to use the fft() function on the signal?
ramdas patil
2014-6-14
Image Analyst
2014-6-14
Just getting back, and I noticed you accepted Azzi's answer so I assume that this question is not applicable anymore. Glad everything is working.
Bow
2018-3-31
Adding a small correction to the answer above. You should include fs as an argument into the sound function if you want it to play correctly. If you don't MATLAB will use the default sampling freqeuncy, which is not 20500Hz. So the last line should be
sound(a,fs)
Image Analyst
2021-2-17
@Bow, I don't think you were talking about my code. My code did/does use Fs and doesn't call the signal "a". (I downloaded it to check.) Regardless, I'm attaching the latest version which uses the new sound function "audioplayer()":
player = audioplayer(y, Fs);
play(player);
I'd advise anyone to use this version (attached to this comment) instead of the original version of the m-file attached to my original 6 year old answer.
zina shadidi
2019-5-22
0 个投票
can I use your demo??
If you agree , I want to ask you to explain it to me please
best regards
Zina Al Shadidi
3 个评论
Image Analyst
2019-5-22
Yes, you can use it. The explanations are in the comments. The code is well and heavily commented.
zina shadidi
2019-5-22
sorry Image Analyst
I can not find it or any comments
Image Analyst
2019-5-23
It's attached to my answer. I'm attaching it again here.
Open the code in MATLAB and you'll see many, many lines with a % on them (indicating comments). The comments will also be color coded in green. If you have any questions not explained well by the existing comments, write back to tell me what chunk of code is not well explained/commented.
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