Re: [Discuss-gnuradio] Audio Sample rate problem
for future searches and in case it's linux, i did this when i bumped
into the same problem a while ago:
$ cat ~/.asoundrc
pcm.rate_convert {
type plug
slave {
pcm hw:0,0
rate 32000
}
}
bst, opt
Bob McGwier rwmcgw...@gmail.com writes:
In gnuradio-examples/python/audio there is a completely worked out
example block to do EXACTLY what was requested, go to and from 32000
and 48000. It is good practice to look in the examples directory
because with very high probability, the developers who check stuff in
have faced the kinds of problems you want to tackle. Ask after you
have looked there.
In this case it is test_resampler.py
It does a PERFECT 3/2 polyphase resampling ( and back 2/3) since that
is a rational fraction, not an approximation. If you use the
low_pass_2 filters, you gain better control over the number of taps
required. It uses the brilliant study by fred harris of finding the
minimum number of taps that will just exceed the number required to
get in band ripple, transition bandwidth, and stop band rejection you
are targeting.
Bob
davek wrote:
On Tue, Jul 7, 2009 at 11:20 PM, Abdalla Sokarabdallaso...@yahoo.com wrote:
thanx very much this way really worx and wonderfully too
--- On Wed, 7/8/09, davek davidki...@gmail.com wrote:
From: davek davidki...@gmail.com
Subject: Re: [Discuss-gnuradio] Audio Sample rate problem
To: Abdalla Sokar abdallaso...@yahoo.com
Date: Wednesday, July 8, 2009, 5:14 AM
i dont know much about this so it might be wrong but
if you cant figure it out you could put a fractional interpolation
filter before your audio block set to 2/3
On Tue, Jul 7, 2009 at 8:58 PM, Abdalla Sokarabdallaso...@yahoo.com wrote:
my audio sampling rate is 48000 not 32000 so all the the gnu examples that
output an audio dont work and due to this 48000 i cant configure the
decimation and interpolation to be even integers as required
so is there away to change sampling rate of my audio card to 32000
i am using Dell Inspiron 1525 with ubuntu 9.04 with the latest version of
GNU
and my USRP is rev 4.2
Please i need help ASAP
Thanx
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Re: [Discuss-gnuradio] Audio Sample rate problem
In gnuradio-examples/python/audio there is a completely worked out example block to do EXACTLY what was requested, go to and from 32000 and 48000. It is good practice to look in the examples directory because with very high probability, the developers who check stuff in have faced the kinds of problems you want to tackle. Ask after you have looked there. In this case it is test_resampler.py It does a PERFECT 3/2 polyphase resampling ( and back 2/3) since that is a rational fraction, not an approximation. If you use the low_pass_2 filters, you gain better control over the number of taps required. It uses the brilliant study by fred harris of finding the minimum number of taps that will just exceed the number required to get in band ripple, transition bandwidth, and stop band rejection you are targeting. Bob davek wrote: On Tue, Jul 7, 2009 at 11:20 PM, Abdalla Sokarabdallaso...@yahoo.com wrote: thanx very much this way really worx and wonderfully too --- On Wed, 7/8/09, davek davidki...@gmail.com wrote: From: davek davidki...@gmail.com Subject: Re: [Discuss-gnuradio] Audio Sample rate problem To: Abdalla Sokar abdallaso...@yahoo.com Date: Wednesday, July 8, 2009, 5:14 AM i dont know much about this so it might be wrong but if you cant figure it out you could put a fractional interpolation filter before your audio block set to 2/3 On Tue, Jul 7, 2009 at 8:58 PM, Abdalla Sokarabdallaso...@yahoo.com wrote: my audio sampling rate is 48000 not 32000 so all the the gnu examples that output an audio dont work and due to this 48000 i cant configure the decimation and interpolation to be even integers as required so is there away to change sampling rate of my audio card to 32000 i am using Dell Inspiron 1525 with ubuntu 9.04 with the latest version of GNU and my USRP is rev 4.2 Please i need help ASAP Thanx ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] Audio Sample rate problem
my audio sampling rate is 48000 not 32000 so all the the gnu examples that output an audio dont work and due to this 48000 i cant configure the decimation and interpolation to be even integers as required so is there away to change sampling rate of my audio card to 32000 i am using Dell Inspiron 1525 with ubuntu 9.04 with the latest version of GNU and my USRP is rev 4.2 Please i need help ASAP Thanx ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Audio Sample rate problem
On Tue, Jul 7, 2009 at 11:20 PM, Abdalla Sokarabdallaso...@yahoo.com wrote: thanx very much this way really worx and wonderfully too --- On Wed, 7/8/09, davek davidki...@gmail.com wrote: From: davek davidki...@gmail.com Subject: Re: [Discuss-gnuradio] Audio Sample rate problem To: Abdalla Sokar abdallaso...@yahoo.com Date: Wednesday, July 8, 2009, 5:14 AM i dont know much about this so it might be wrong but if you cant figure it out you could put a fractional interpolation filter before your audio block set to 2/3 On Tue, Jul 7, 2009 at 8:58 PM, Abdalla Sokarabdallaso...@yahoo.com wrote: my audio sampling rate is 48000 not 32000 so all the the gnu examples that output an audio dont work and due to this 48000 i cant configure the decimation and interpolation to be even integers as required so is there away to change sampling rate of my audio card to 32000 i am using Dell Inspiron 1525 with ubuntu 9.04 with the latest version of GNU and my USRP is rev 4.2 Please i need help ASAP Thanx ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
