How this code using the wavread function works in matlab? -


i have problems understanding code question (i can't comment on answer because i'm new , don't have enough reputation).

the code this:

[song, fs] = wavread('c:\path of file\song.wav'); song = song(1:fs*10); spectrogram(song, windowsize, windowoverlap, freqrange, fs, 'yaxis');

i don't know second line of code does. can explain it? affect output of spectrogram?

my code is:

[song, fs] = wavread('c:\users\iván\downloads\kawai-k3-strings-c5.wav'); song = song(1:fs*5); //(first line ...(1:fs*10) didnt work. why? know. spectrogram(song, 256, [], [], fs, 'xaxis');

the second line of code extracting sample of song's time series of length 10 times sampling frequency in hertz.

you should first check there enough samples in song checking length of song using

songlength = numel(song)/fs

if there not enough samples cover 10 times sample frequency, use shorter multiplier.

the spectrogram being computed on sample, rather whole song.

you'll need consult matlab documentation on spectrogram select call options accomplish useful signal processing goals, depending on want do.


Comments

Post a Comment

Popular posts from this blog

c# - Validate object ID from GET to POST -

i have method allows user access comment have made on site. have post method lets them update comment. my normal solution send entire comment model through, let them update it, update on database when post back. involve sending commentid through in hiddenfor , can manipulated. how can verify commentid sent in get method same i'm getting in post , not able alter comment wish? how can verify commentid sent in method same i'm getting in post? basically have validate following things in post - user logged-in user. authenticated users post comments. commentid in post , should valid commentid , should present in database. userid associated logged-in user should same userid associated comment . comment should contain userid column, can check @ time of update. to make sure update happens comment has been sent in get - hold commentid in session , in post action compare commentid value in session .
Read more

node.js - Custom Model Validator SailsJS -

when using custom model validator checks record within model. return within spread doesn't seem end control flow. //post.js model /** * custom validator **/ types: { isuservalid: function(user_id) { var promise = require('bluebird'); promise.all([ user.findone({id: user_id}) ]) .spread(function(user) { console.log(user); if (user === null || user === undefined) { console.log('failed'); return false; }else{ console.log('passed'); return true; } }); } }, my response standard validation failed response. { "error": "e_validation", "status": 400, "summary": "1 attribute invalid", "model": "post", "invalidattributes": { "owner": [ { "rule": "isuservalid", ...
Read more

php - Find a regex to take part of Email -

i have following emails need extract part from: bestellnummer xxx: 1 von xxx, 1er pack ------------- anfang der nachricht ------------- foo bar baz foo bar baz // <<<<< need text here ------------- ende der nachricht ------------- ------------- anfang der nachricht ------------- foo bar baz foo bar baz ------------- ende der nachricht ------------- there 0 unlimited occurences of ------------- anfang der nachricht ------------- ------------- ende der nachricht ------------- and i'm able extract first part regex: $re = "/------------- .*? -------------.?(.*?).?------------- .*? -------------/s"; but, i'm quite new on learning regex, i'm pretty sure there must better regex extract part (foo bar baz foo bar baz) of text between ------------- anfang der nachricht ------------- ------------- ende der nachricht ------------- as can in different languages, i'm using .? to match between hyphens. i...
Read more