Solved

filter a sound file

Posted on 2009-04-08
5
1,299 Views
Last Modified: 2013-11-25
hi,
can anyone help me with the sound file i have to filter it so that i can clear it and hear that word on it. this is has to be done on MATLAB programming software, and i have the file attached bellow for you....
 please not that i have gave the file an extention (.doc), but you have to change it back to (.wav) when you receive it, and when you send it back you have to send it be different extention againg, otherwize it would not be allowed to upload on you website...
anyway, can you please send me the explenation how it flitered please, (if sorted)

thank you
0
Comment
Question by:ferman-k
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
5 Comments
 
LVL 15

Expert Comment

by:yuk99
ID: 24099112
No file attached, please upload.
0
 

Author Comment

by:ferman-k
ID: 24102951
i thought i have attached the file, anyway, i am sorry here is the file, but again, please note that i have changed the extention of the file  to .doc   in order to be send, so when you receive it please change the extention back to .wav
deng.doc
0
 
LVL 5

Expert Comment

by:LukeyJay
ID: 24106958
Hello, there.  This sounds like a homework assignment, am I right?  If that is the case, we can't do the work for you.  But here's some code to get you started.  You can experiment with various filter types and sizes.  If you don't understand some of the functions, just look them up in the help files.

Luke
alo = [1 1 0 0];
ahi = [0 0 1 1];
f = [0 0.05 0.1 1];
n = 50;
h = firpm(n,f,alo);
[x,Fs,Nbits,Opts] = wavread('deng.wav');
y = filter(h,1,x);
soundsc(y,Fs)

Open in new window

0
 
LVL 9

Accepted Solution

by:
masheik earned 500 total points
ID: 24109094
--can anyone help me with the sound file i have to filter it so that i can clear it and hear that word--
read the file using wavread and plot fft of the file  see frequency content and  what should be removed?

you can find examples here
http://www.electronics.dit.ie/staff/ptobin/lab015.pdf


About filtering and reading wav files this link can help you

read and try your own,
http://www.aquaphoenix.com/lecture/matlab10/page4.html
an example filter implementation
http://ccrma-www.stanford.edu/~jos/fp/Matlab_Filter_Implementation.html
0
 
LVL 5

Expert Comment

by:LukeyJay
ID: 24110081
For the frequency content, try using the pwelch command.  It gives you the power spectral density.  The basic command is

pwelch(x)

you can also add other inputs to the function for things like sampling frequency and such.

Luke
0

Featured Post

The Ultimate Checklist to Optimize Your Website

Websites are getting bigger and complicated by the day. Video, images, custom fonts are all great for showcasing your product/service. But the price to pay in terms of reduced page load times and ultimately, decreased sales, can lead to some difficult decisions about what to cut.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

If you haven’t already, I encourage you to read the first article (http://www.experts-exchange.com/articles/18680/An-Introduction-to-R-Programming-and-R-Studio.html) in my series to gain a basic foundation of R and R Studio.  You will also find the …
This article will show, step by step, how to integrate R code into a R Sweave document
The goal of the video will be to teach the user the difference and consequence of passing data by value vs passing data by reference in C++. An example of passing data by value as well as an example of passing data by reference will be be given. Bot…
The viewer will learn how to use the return statement in functions in C++. The video will also teach the user how to pass data to a function and have the function return data back for further processing.

729 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question