# [Scilab-users] How to convert .wav to formula?

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## [Scilab-users] How to convert .wav to formula?

 How to convert .wav to formula? In scilab I can write like:     t=soundsec(0.5);     s=[sin(2*%pi*440*t)];     savewave('foo.wav', s); and by this convert formula to .wav. But how can I convert .wav to formula? If I use     analyze(loadwave('foo.wav')); I only got graphic? What to do? _______________________________________________ users mailing list [hidden email] http://lists.scilab.org/mailman/listinfo/users
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## Re: How to convert .wav to formula?

 Hi, Q: "I only got graphic? What to do?" A: look at Fourier synthesis of periodic waveforms. For the toy example provided of a monochromatic wave, the simple code here below finds the approximate solution. More general waveform case, needs much more programming effort. // START OF CODE clear; clf; fs = 22050; // default sampling rate (Hz) t=soundsec(0.5,fs); s=[sin(2*%pi*440*t)]; savewave('foo.wav', s); y = loadwave('foo.wav'); y = [y zeros(y)];  // make #samples even & increase spectral resolution Yf = abs(fftshift(fft(y))); N = length(Yf); Yf = Yf(N/2+1:\$); f = linspace(0,fs/2-fs/N,N/2); [y0 k] = max(Yf); plot(f,Yf,'blue',f(k),Yf(k),'*red') xlabel("Frequency [Hz]") printf("sinusoid frequency = %.1f Hz",f(k)) // END OF CODE Regards, Rafael _______________________________________________ users mailing list [hidden email] http://lists.scilab.org/mailman/listinfo/users
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## Re: How to convert .wav to formula?

 Пожалуйста -- Sent from: http://mailinglists.scilab.org/Scilab-users-Mailing-Lists-Archives-f2602246.html_______________________________________________ users mailing list [hidden email] http://lists.scilab.org/mailman/listinfo/users