Re: [Discuss-gnuradio] Arbitrary resampler question on gnuradio 3.7.2.1

[Marcus Müller]

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Hi George,

I can't really see what should have changed in the c2f / f2c behaviour.
My wild guess is: old (like, quite old) versions of GNU Radio UHD used
to have a 2^16 range, while modern USRP interfaces want samples with
im and re parts in [-1;1].

By the way: why the c2f -> f2c thing?

Greetings and happy hacking,
Marcus

On 18.12.2013 03:06, George wrote:
> Hello all,
> 
> Considering a simple gnuradio flowgraph as the following
> 
> Random source -> chunks2symbols -> complex2float -> float2complex
> -> pfb_arb_resampler-> USRP sink
> 
> which used to work without any problem in the older gnuradio
> distributions, in the newer 3.7.2.1 seems that the conversion above
> (from complex to float and float to complex) introduces a problem,
> that has to do with USRP transmissions.
> 
> However, when I increased the number of taps used for the root
> raised cosine filter in pfb_arb_resampler by a factor of 100,
> everything seems to work properly.
> 
> Note that if the conversions float2complex and complex2float miss
> everything works.
> 
> Any ideas why?
> 
> Thanks, -George _______________________________________________ 
> Discuss-gnuradio mailing list address@hidden 
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
> 
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