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From: | Jeff Long |
Subject: | Re: Strange FFT AUDIO |
Date: | Mon, 19 Apr 2021 14:32:33 -0400 |
Right, actual signals are not perfect. If they were, you would have no harmonics at all (assuming you are using a sin or cos source). You do not show the dB scale, but it looks like the 1kHz spike is quite a bit larger than anything else.On Mon, Apr 19, 2021 at 2:13 PM Alberto <alberto_gnuradio@libero.it> wrote:
Hi to all!I have created a simple test in GNURadio.Audio Source (audio pc interface) ——> QT GUI FREQUENCY SINK.Audio is 1 KHz sine wave generate from Hp-8604B from FM bnc output.In QT FREQUENCY SINK i see this:
Center frequency is 1 KHz.This are a blocks:In this image, same signal, but with other audio analysis.why these huge differences?Why a second peak at 2 KHz with same amplitude of 1KHz ?ok it could be a harmonic ... but not of the same amplitudeByeAlbertoInviato da iPhone
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