Re: [Discuss-gnuradio] terminate called after throwing an instance of 'std::invalid_argument'

[Marcus Müller]

Dear Shaunwag,

that depens on the bandwidth you want to let through your filter, but
typically, use something like

firdes.low_pass(1.0, samp_rate, 25e3, 25e3)

which will build a tap vector for you; the arguments (in this order) are:
1. gain in passband
2. sampling rate
3. cutoff frequency of pass band in Hz
4. transition with between pass- and stop band

Generally, you should have a bit of fun with the tool that you as
"gr_filter_design"; it gives you a good feeling for what kind of filters
make sense (e.g. when you try to filter out 25kHz out of a 10MHz input
stream with a single FIR filter using the method described above, you'd
get a ~1000 taps filter. And no noone should expect their CPU to compute
that in real time.), and where you can allow your filter to have a bit
more of "slack".

Best regards,
Marcus

On 06/12/2015 03:42 PM, shaunwang wrote:
> Thank you so much. Tom
>
> Could you please tell me what a typical value in tabs is?
>
>
>
> --
> View this message in context: 
> http://gnuradio.4.n7.nabble.com/terminate-called-after-throwing-an-instance-of-std-invalid-argument-tp54156p54164.html
> Sent from the GnuRadio mailing list archive at Nabble.com.
>
> _______________________________________________
> Discuss-gnuradio mailing list
> address@hidden
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio