Re: [Discuss-gnuradio] Rational Resampler no output.

[Marcus Müller]

Hi Cor,

 * When using 1 as "taps" there is output.

Aha!!
So, here's the thing: something might be going wrong in the python code that sets up the taps automatically if you don't set them explicitly.
Maybe you can figure out where things go wrong; the interesting part (maybe add some `print`s here?) from [1]:

        # If we don't have user-provided taps, reduce the interp and
        # decim values by the GCD (if there is one) and then define
        # the taps from these new values.
        if taps is None:
            interpolation = interpolation // d
            decimation = decimation // d
            taps = design_filter(interpolation, decimation, fractional_bw)

and


def design_filter(interpolation, decimation, fractional_bw):
    """
    Given the interpolation rate, decimation rate and a fractional bandwidth,
    design a set of taps.

    Args:
        interpolation: interpolation factor (integer > 0)
        decimation: decimation factor (integer > 0)
        fractional_bw: fractional bandwidth in (0, 0.5)  0.4 works well. (float)
    Returns:
        : sequence of numbers
    """

    if fractional_bw >= 0.5 or fractional_bw <= 0:
        raise ValueError, "Invalid fractional_bandwidth, must be in (0, 0.5)"

    beta = 7.0
    halfband = 0.5
    rate = float(interpolation)/float(decimation)
    if(rate >= 1.0):
        trans_width = halfband - fractional_bw
        mid_transition_band = halfband - trans_width/2.0
    else:
        trans_width = rate*(halfband - fractional_bw)
        mid_transition_band = rate*halfband - trans_width/2.0

    taps = filter.firdes.low_pass(interpolation,                     # gain
                                  interpolation,                     # Fs
                                  mid_transition_band,               # trans mid point
                                  trans_width,                       # transition width
                                  filter.firdes.WIN_KAISER,
                                  beta)                              # beta

    return taps



Best regards,
Marcus

[1] https://github.com/gnuradio/gnuradio/blob/master/gr-filter/python/filter/rational_resampler.py

On 29.05.2017 19:01, Cor Legemaat wrote:

Hi:

 * The only warning is about the thread priority but that's on both.
 * Type "Complex->Complex (Complex Taps)"
 * When using 1 as "taps" there is output.

I can open it in Nemiver if I know where to put the break point...

Regards:
Cor

On Mon, 2017-05-29 at 11:36 +0200, Marcus Müller wrote:

Hi Cor,
that's kind of surprising¹. My first bet is that your AMD system is
missing some dependency that the intel system has, so that something
goes wrong during build. But then again, you shouldn't be seeing the
rational resampler block at all in that case. Let's head straight to
debugging:
* Do you get any warning/console output during the execution of that
flow graph?
* Which is the input/output type (float or complex, orange or blue
connector in GRC, if using that)
* If in GRC: when explicitly using [1,] as "taps", do you get output?
Best regards,
Marcus

¹ "wat?!"

On 29.05.2017 06:35, Cor Legemaat wrote:

Hi:

I have 2 different hardware setup's with funtoo/gentoo and gnuradio
installed. On the Intel system the "Rational Resampler" is working
correctly but on the AMD system there is no output. This is on a
flow
graph for an basic wide band fm receiver based on the USPR 10min fm
receiver tutorial.

AMD system:
 * AMD FX(tm)-8150 Eight-Core Processor
 * CPU_FLAGS_X86="aes avx fma4 mmx mmxext popcnt sse sse2 sse3
sse4_1 sse4_2 sse4a ssse3 xop"

Intel system:
 * Intel(R) Core(TM) i5-2430M CPU @ 2.40GHz
 * CPU_FLAGS_X86="aes avx mmx mmxext popcnt sse sse2 sse3 sse4_1
sse4_2
   ssse3"

Tried with different versions of GNURadio and gcc but the same
symptoms, both systems is compiled with CFLAGS="-march=native -O2
-pipe". At the moment it is gcc:6.3.0  and net-wireless/gnuradio-
3.7.11:0/3.7.11  USE="alsa analog atsc audio channels digital doc
dtv
examples fec filter grc noaa pager performance-counters portaudio
qt4
uhd utils vocoder wavelet wxwidgets zeromq -fcd -jack -log -oss
-sdl {-
test} -trellis" PYTHON_TARGETS="python2_7"

Where do I start to search?

Regards:
Cor


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