how to find the number of points in audio?
2 次查看(过去 30 天)
显示 更早的评论
point=200;
%Calculate the number of frames
n=floor(length(x)/point); %n takes the closest largest integer
enframe=zeros(point,n);%Initialize, one frame per column
how to find number of points in audio?
0 个评论
采纳的回答
Walter Roberson
2019-4-14
Audio files do not inherently have "points".
The code you are using appears to be part of dividing a single channel of audio into a number of fixed-sized windows, and you are asking how to determine the window size. The appropriate size for a window depends upon the sampling frequency and upon what kind of operations you are doing with the windows.
Also, for audio, it is common to use overlapping windows in order to better match phases.
I recommend that you look at https://www.mathworks.com/help/signal/ref/buffer.html buffer() to do the work of creating windows from your signal, once you have figured out how big the window should be.
2 个评论
Walter Roberson
2019-4-15
The 200 (400 in the comments) and 0.2 cutoff are arbitrary, especially since you commented out the normalization. To get something that was not arbitrary you would need to have a calibrated system that you could calculate SPL (sound pressure level) from and you would combine that with information on studies on audibility in humans.
更多回答(0 个)
另请参阅
类别
在 Help Center 和 File Exchange 中查找有关 Audio I/O and Waveform Generation 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!