Matlab spectrogram Hann window -


my task
have signal in .wav format sampling frequency 44100hz. want power spectrum. stft hann window size 200ms , window period 50hz. frequency range forcing 0 ~ 22000hz.

my question
can want following code?

[y, fs, nbits, opts] = wavread('a.wav'); [s,f,t,p]=spectrogram(y,hanning(8820),7938,[0:100:22000],fs);

the matrix p returned above code want, right?

further question

  1. what relationship between window size , fft size? through independent in past not sure. can provide simple answer or reference reading?
  2. i have command specgram(x, 512, 8000, hamming(80)); --- guess original purpose that:
    signal sampling frequency : 8000
    window nfft : 1024
    window period : 10ms
    actually, not sure original purpose of code, can read it?

i not think formatting spectrogram code properly.

the commands follows

 [s,f,t,p] = spectrogram(x,window,noverlap,nfft,fs)

where x data, window hanning window, noverlap window jump, nfft fft size , fs data's sampling rate. want 

 nfft = 2^nextpow2(fs*200/1000);  spectrogram(y,hanning(nfft),fs/50,nfft,fs);

so hanning window many samples in 200ms, dependent on sampling rate.

this should window things how want, , give desired spectrogram, can use want.

as question if p want. yes return power spectrum. if that's want, sure.


Comments

Post a Comment

Popular posts from this blog

curl - PHP fsockopen help required -

i trying work on cloudflare api , have found in documentation. unfortunately have no idea how can use in fsockopen or through curl. here example of post request. need know how can make request below data post using curl or fsockopen curl https://www.cloudflare.com/api_json.html -d 'a=cache_lvl' \ -d 'tkn=8afbe6dea02407989af4dd4c97bb6e25' \ -d 'email=sample@example.com' \ -d 'z=example.com' \ -d 'v=agg' here link cloudflare https://www.cloudflare.com/docs/client-api.html#s4.2 try one: $ch = curl_init("https://www.cloudflare.com/api_json.html"); curl_setopt($ch, curlopt_returntransfer,1); curl_setopt($ch, curlopt_followlocation, 1); curl_setopt($ch, curlopt_ssl_verifypeer,false); // handling of -d curl parameter here. $param = array( 'a' => 'cache_lvl', 'tkn' => '8afbe6dea02407989af4dd4c97bb6e25', 'email' => 'sample@example.com', 'z' =...
Read more

HTTP/1.0 407 Proxy Authentication Required PHP -

i working in restricted network/limited access internet. since have use proxy make web service call. here php code calling web service , response . $client = new soapclient("http: //www.xyz.com/abc/wsdls/login.wsdl", array("trace" => 1, "exceptions" => 1, 'proxy_host' => $proxy_host, 'proxy_port' => $proxy_port, 'proxy_login' => $proxy_login, 'proxy_password' => $proxy_password)); response is fatal error: uncaught soapfault exception: [wsdl] soap-error: parsing wsdl: couldn't load ' http://www.xyz.com/abc/wsdls/login.wsdl ' : failed load external entity if copy url error message , paste in browser(with same proxy settings) works. 2nd scenario is, if pass values instead of variables giving me diffarant response $client = new soapclient("http: //www.xyz.com/abc/wsdls/login.wsdl", array("trace" => 1, "exceptions" => 1, 'proxy_host' ...
Read more

c# - Resource not found error -

i have problem accessing method on homecontroller. show code of method : [httpget] public actionresult decriptidentifiantetredirige(string login_crypter, string mdp_crypter) { string loginacrypter = _globalmanager.protegemotdepasse(login_crypter); string mdpacrypter = _globalmanager.protegemotdepasse(mdp_crypter); user userapp = new models.user(login_crypter, mdp_crypter); if (userapp.authentificationvalidee(userapp.userlogin, userapp.password)) { session["name"] = userapp.userlogin; return redirecttoaction("accueil", "home"); } else { return redirecttoaction("validerauthentification", "home"); } } then in routeconfig.cs wrote route : routes.maproute( name: "authentificationapresdecryptage", url: "{controller}/{action}/{login_crypter}/{mdp_crypter}", defaults: new...
Read more