realtime spectrogram

2011 7 16
1 个回答
3 次查看（30 天）

0 个投票

Hello, I am trying to read in using analoginput, then what i want to do is display the spectrogram in real-time. i managed to do this using audiorecorder, but it wasn`t every smooth, it wouldn`t continuously display the spectrogram.
i did this; in= analoginput('winsound'); chan = addchannel(in,[1 2]);
% Now i have the input.
a=0
while a<100
start(in);
data=getdata(in);
specgram(data(:),512);
a=a+1;
end
but the spectrogram is so bad, (quality wise), and it doesn`t continuously change, can anyone show me how to do this (please)
I want the spectrogram to scroll from right to left, in real time. Please help.

1 个评论
显示 -1更早的评论 隐藏 -1更早的评论

Walter Roberson
Walter Roberson 2011-7-16
Please do not post duplicate questions (referring to the duplicate I already deleted.) You can edit your existing question if you want to add more information.

请先登录，再进行评论。

请先登录，再回答此问题。

回答（1 个）

Walter Roberson
Walter Roberson 2011-7-16

0 个投票

Only do the start(in) once, before the loop.

4 个评论
显示 2更早的评论 隐藏 2更早的评论

rave
rave 2011-7-16
i tried that now, but samething, its not scrolling from right to left and the spectrum quality is so bad:
i came across this: http://www.mathworks.com/matlabcentral/fx_files/2549/1/SoundRecorderDemo.zip
it displays the wave form, from right to left, its exactly i want expect it should display the spectrogram.
i tried to modify it, i saw only thing that has to be modified was the plot_handle fucntion, i changed that to spectrogram(getdata(daw_object))
rave
rave 2011-7-16
..but when i changed to spectrogram(getdata(daw_object)); it gave me tons of erros.
Walter Roberson
Walter Roberson 2011-7-16
See http://www.mathworks.com/matlabcentral/fileexchange/18596-real-time-microphone-and-camera-data-acquisition-and-audio-video-processing/content/Documentation.html
rave
rave 2011-7-16
i don`t know if it`s me or not. but when i try to run it, the spectrogram doesn`t update the spectrum at realtime

请先登录，再进行评论。

类别

在 帮助中心 和 File Exchange 中查找有关 Matrix Indexing 的更多信息

产品

标签

提问:

rave
rave
2011-7-16

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by