if i phase shift a sine wave does it cause spectral leakage?
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From: bharat pathak on 28 Jul 2010 09:58 Hello All, Lets say, N = 32; n = 0 : N-1; fin = 1500 hz; Fs = 48000 hz; % Fs/fin = 32/1 xn = sin(2*pi*fin*n/Fs + theta) xk = fft(xn) If Fs and fin are exact mutiple, if i have theta non-zero, will it cause spectral leakage in FFT mag response, or it will show up as an added offset in the phase plot? Regards Bharat
From: Rune Allnor on 28 Jul 2010 10:04 On 28 Jul, 15:58, "bharat pathak" <bharat(a)n_o_s_p_a_m.arithos.com> wrote: > Hello All, > > Lets say, > > N = 32; > n = 0 : N-1; > fin = 1500 hz; > Fs = 48000 hz; % Fs/fin = 32/1 > > xn = sin(2*pi*fin*n/Fs + theta) > xk = fft(xn) > > If Fs and fin are exact mutiple, if i have theta non-zero, > will it cause spectral leakage in FFT mag response, or it will > show up as an added offset in the phase plot? > > Regards > Bharat Why don't you try it and see? Rune
From: Vladimir Vassilevsky on 28 Jul 2010 10:07 Rune Allnor wrote: > On 28 Jul, 15:58, "bharat pathak" <bharat(a)n_o_s_p_a_m.arithos.com> > wrote: > >>Hello All, >> >> Lets say, >> >> N = 32; >> n = 0 : N-1; >> fin = 1500 hz; >> Fs = 48000 hz; % Fs/fin = 32/1 >> >> xn = sin(2*pi*fin*n/Fs + theta) >> xk = fft(xn) >> >> If Fs and fin are exact mutiple, if i have theta non-zero, >> will it cause spectral leakage in FFT mag response, or it will >> show up as an added offset in the phase plot? >> >>Regards >>Bharat > > > Why don't you try it and see? Because he is imbecile and hopeless idiot. Don't you know this already?
From: Rune Allnor on 28 Jul 2010 11:03 On 28 Jul, 16:07, Vladimir Vassilevsky <nos...(a)nowhere.com> wrote: > Rune Allnor wrote: > > On 28 Jul, 15:58, "bharat pathak" <bharat(a)n_o_s_p_a_m.arithos.com> > > wrote: > > >>Hello All, > > >> Lets say, > > >> N = 32; > >> n = 0 : N-1; > >> fin = 1500 hz; > >> Fs = 48000 hz; % Fs/fin = 32/1 > > >> xn = sin(2*pi*fin*n/Fs + theta) > >> xk = fft(xn) > > >> If Fs and fin are exact mutiple, if i have theta non-zero, > >> will it cause spectral leakage in FFT mag response, or it will > >> show up as an added offset in the phase plot? > > >>Regards > >>Bharat > > > Why don't you try it and see? > > Because he is imbecile and hopeless idiot. Don't you know this already? Seems I had too much time on my hands... thanks for pointing it out. Rune
From: Dirk Bell on 28 Jul 2010 13:31
On Jul 28, 9:58 am, "bharat pathak" <bharat(a)n_o_s_p_a_m.arithos.com> wrote: > Hello All, > > Lets say, > > N = 32; > n = 0 : N-1; > fin = 1500 hz; > Fs = 48000 hz; % Fs/fin = 32/1 > > xn = sin(2*pi*fin*n/Fs + theta) > xk = fft(xn) > > If Fs and fin are exact mutiple, if i have theta non-zero, > will it cause spectral leakage in FFT mag response, or it will > show up as an added offset in the phase plot? > > Regards > Bharat Bharat, Aren't you teaching seminars on DSP? Dirk |