fft - Trouble doing fourier transform of ASK using MATLAB -


we have ask modulated signal. need fourier transform, therefore used fft, need abs() 1 side? , code complete? i'm not sure how transfer time domain (t) frequency domain (f) in order matlab.

clear all; clc; close all;  f1=input('enter frequency of carrier='); f2=input('enter frequency of pulse='); a=3; t=0:0.001:1; x=a.*sin(2*pi*f1*t); u=a/2.*square(2*pi*f2*t)+(a/2); v=x.*u;  figure subplot(4,1,1); plot(t,x); xlabel('time'); ylabel('amplitude'); title('carrier'); grid on; subplot(4,1,2); plot(t,u); xlabel('time'); ylabel('amplitude'); title('square pulses'); grid on; subplot(4,1,3); plot(t,v); xlabel('time'); ylabel('amplitude'); title('ask signal'); grid on; fs=100; q=fft(v); subplot(4,1,4); plot(fs,q); grid on;

if not sure if should use abs() or not, use it. more info.

fs=100; q=abs(fft(v)); subplot(4,1,4); plot(q);

Comments

Post a Comment

Popular posts from this blog

android - Get AccessToken using signpost OAuth without opening a browser (Two legged Oauth) -

i using signpost oauth access data magento server. have read various tutorials on same , reach point open browser user can enter credentials. however, per requirement have automate part. hence, user should not browser page. have set-up done on server side ( magento ), hit url , returned call page. same through program in android. i have tried below, consumer = new commonshttpoauthconsumer(key, secret); provider = new commonshttpoauthprovider(oauth_init_url,access_token_url, authorize_url); try { provider.retrieverequesttoken(consumer, oauth.out_of_band); log.d("tokens" , consumer.gettoken() + " -- " + consumer.gettokensecret()); } and request tokens. dont know how bypass next step. tried directly accessing accesstoken (stupid of me) provider.retrieveaccesstoken(consumer, "mycallback://callback"); no luck, ends in oauth.signpost.exception.oauthnotauthorizedexception: authorization failed (server replied 401). ...
Read more

org.mockito.exceptions.misusing.InvalidUseOfMatchersException: mockito -

getting error org.mockito.exceptions.misusing.invaliduseofmatchersexception: invalid use of argument matchers! 1 matchers expected, 2 recorded. exception may occur if matchers combined raw values: //incorrect: somemethod(anyobject(), "raw string"); when using matchers, arguments have provided matchers. example: //correct: somemethod(anyobject(), eq("string matcher")); at when( getprogramservice .callservice(any(getprogramtype.class))) .thenreturn(jaxbresponse); please explain error , possible resolution the code posted looks fine; don't see problem it. code before or above causing exception. key here: invalid use of argument matchers! 1 matchers expected, 2 recorded. any , used above, doesn't return "special kind of null" or "special kind of getprogramtype"; don't exist. instead, returns null , side effect puts matcher on stack. whe...
Read more

google shop client API returns 400 bad request error while adding an item -

i'm working on solution add items in google shopping market java application. following tutorial real mess because of missing classes of laste release, after setting 1.5-beta maven managed make base example typecheck correctly classes. still can make simple task of adding 1 item. instead of posting whole code i'm posting part creates product feed. private product createproduct(string id) { product product = new product(); product.title = "red wool sweater"; product.content = new content( "text", "comfortable , soft, sweater keep warm on " + "cold winter nights. red , blue stripes."); product.appcontrol = new appcontrol(); product.appcontrol.addrequireddestination("productads"); product.externalid = id; product.lang = "it"; product.country = "it"; product.condition = "nuovo"; product.price = new price("eu...
Read more