[op25-dev] Re: No audio

Tom Hayward tom@tomh.us [op25-dev] op25-dev at yahoogroups.com
Wed Oct 18 16:49:45 UTC 2017


On Tue, Oct 17, 2017 at 7:45 PM, gnorbury at bondcar.com [op25-dev] <
op25-dev at yahoogroups.com> wrote:

>
>
> Addendum: the filter error is something I saw once before.  For some
> unknown reason your version of gnuradio does not have the fft_filter_ccf()
> routine, so you are forced to use fir_filter_ccf() instead.  Max's code
> uses the FIR version by default, but I'd changed mine to use FFT because it
> was much more cpu-efficient for the lightweight hardware such as Rasp PI 3.
>
> You can edit the p25_demodulator.py file, line 173 and change 'fft' to
> 'fir' and it should work on your system.
>
Lower CPU usage sounds nice. I'd like to take advantage of it. My
installation has the Ubuntu 14.04 gnuradio package (having followed these
instructions:
http://op25.osmocom.org/trac/wiki.=/wiki/InstallInstructionsPage#InstallInstructions).
Is there a different distribution or gnuradio package you recommend to get
fft_filter_ccf()?

Tom
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