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 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 Sokar wrote:
>>>
>>>
>>> thanx very much this way really worx and wonderfully too
>>>
>>> --- On Wed, 7/8/09, davek wrote:
>>>
>>> From: davek
>>> Subject: Re: [Discuss-gnuradio] Audio Sample rate problem
>>> To: "Abdalla Sokar"
>>> 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 Sokar 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 Sokar wrote: thanx very much this way really worx and wonderfully too --- On Wed, 7/8/09, davek wrote: From: davek Subject: Re: [Discuss-gnuradio] Audio Sample rate problem To: "Abdalla Sokar" 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 Sokar 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
Re: [Discuss-gnuradio] Audio Sample rate problem
On Tue, Jul 7, 2009 at 11:20 PM, Abdalla Sokar wrote: > > > > thanx very much this way really worx and wonderfully too > > --- On Wed, 7/8/09, davek wrote: > > From: davek > Subject: Re: [Discuss-gnuradio] Audio Sample rate problem > To: "Abdalla Sokar" > 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 Sokar 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
[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
