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From: | Alberto |
Subject: | Strange FFT AUDIO |
Date: | Mon, 19 Apr 2021 20:09:01 +0200 |
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 amplitude Bye Alberto Inviato da iPhone |
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