I’m using gnuradio-3.3.0 with GRC.
I’ve builded a graph with a Complex cosine (8Ms/s of sample rate and 1 MHz of
frequency), the fractional interpolator with 12/8 value for interpolation and a
FFT sink with 12MS/s of sample rate. (throttle block included).
I’m expecting to see a 1MHz cosine with the FFT, but i see a 2.25MHz cosine. If
i put 8/12 (the inverse) i see the (correct) 1MHz cosine.
Why?
If i use the Rational resampler, with interpolation 12 and decimation 8, i see
the correct 1MHz cosine. What’s wrong with fractional interpolator block?
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