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The amplitude of the 500Hz signal is 0.3 dB, the frequency spectrum graph shows a peak of roughly the same magnitude (probably off by a factor 2 because OP's normalization is off). The 0 Hz peak should be around 63.8 dB, it's again pretty close to twice that value.

Cris Luengo
– Cris Luengo

2019-12-16 16:17:53 +00:00
Commented Dec 16, 2019 at 16:17
I think that may come from the fact that OP is taking the Fourier of 20*log10(signal). To be sure, I would try to perform the fft on signal, then compare the result with 20*log10(signal).

CsuGouv
– CsuGouv

2019-12-16 16:44:31 +00:00
Commented Dec 16, 2019 at 16:44

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