Resampling libs

Can anyone recommend a good resampling lib? I need to handle rather
small buffers (100s of Ks of signed 16 bits) but also really long
streams, often covering 24+ hours @250sps, so speed is important.

BTW, tipically I'll be downsampling from 250sps to 200sps, but there
will be other scenarios within the range 100sps <= In/Out sampling freq
<= 5000sps.


TIA,
Ronaldo


  

Ronaldo Souza wrote:

> Can anyone recommend a good resampling lib?

Do it yourself. No big deal. A project for one day.

> I need to handle rather
> small buffers (100s of Ks of signed 16 bits) but also really long
> streams, often covering 24+ hours @250sps, so speed is important.

24 hours @ 250 sps ~ 2M samples. That's nothing; no need to worry about 
speed.

> BTW, tipically I'll be downsampling from 250sps to 200sps, but there
> will be other scenarios within the range 100sps <= In/Out sampling freq
> <= 5000sps.

What is this for, if not a secret?


Vladimir Vassilevsky
DSP and Mixed Signal Design Consultant
http://www.abvolt.com

On 08/16/2010 10:58 AM, Ronaldo Souza wrote:
> Can anyone recommend a good resampling lib? I need to handle rather
> small buffers (100s of Ks of signed 16 bits) but also really long
> streams, often covering 24+ hours @250sps, so speed is important.
>
> BTW, tipically I'll be downsampling from 250sps to 200sps, but there
> will be other scenarios within the range 100sps<= In/Out sampling freq
> <= 5000sps.

Search on "Secret Rabbit Code".

-- 

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

Do you need to implement control loops in software?
"Applied Control Theory for Embedded Systems" was written for you.
See details at http://www.wescottdesign.com/actfes/actfes.html

> Vladimir Vassilevsky wrote:
> > Ronaldo Souza wrote:
> > Can anyone recommend a good resampling lib?
> 
> Do it yourself. No big deal. A project for one day.


If I knew how to do it, I wouldn't waste the group's time, would I?

Regards,
Ronaldo

> Tim Wescott wrote:
> 
> Search on "Secret Rabbit Code".


Thanks, Tim. <googling..>    :)

Regards,
Ronaldo

On 8/16/2010 11:51 AM, Ronaldo Souza wrote:
>> Vladimir Vassilevsky wrote:
>>> Ronaldo Souza wrote:
>>> Can anyone recommend a good resampling lib?
>>
>> Do it yourself. No big deal. A project for one day.
>
>
> If I knew how to do it, I wouldn't waste the group's time, would I?
>
> Regards,
> Ronaldo

And unfortunately, if you don't you'll wind up misapplying any library 
you can find.  Theory/foundations first, code second.

-- 
Rob Gaddi, Highland Technology
Email address is currently out of order

Ronaldo Souza wrote:

>>Vladimir Vassilevsky wrote:
>>
>>>Ronaldo Souza wrote:
>>>Can anyone recommend a good resampling lib?
>>
>>Do it yourself. No big deal. A project for one day.
> 
> 
> 
> If I knew how to do it, I wouldn't waste the group's time, would I?

Don't waste your time; this is not a place where they serve free lunch.

> Rob Gaddi wrote:
> And unfortunately, if you don't you'll wind up misapplying any
> library you can find.  Theory/foundations first, code second.


I'm the first to say I'd have to have some time to really understand
this stuff, but the powers that be think otherwise.   :(


Regards,
Ronaldo

> Vladimir Vassilevsky wrote:
> Don't waste your time; this is not a place where they serve free
> lunch.


ok.
Rgds,
Ronaldo

On 08/16/2010 12:23 PM, Ronaldo Souza wrote:
>> Rob Gaddi wrote:
>> And unfortunately, if you don't you'll wind up misapplying any
>> library you can find.  Theory/foundations first, code second.
>
>
> I'm the first to say I'd have to have some time to really understand
> this stuff, but the powers that be think otherwise.   :(

Applying a library like Secret Rabbit Code blindly may work, and it may 
not.  If it does work, you're lucky.  If it doesn't work, and it breaks 
in the lab, you're a lot more lucky than if it breaks all over a customer.

So try it, test the heck out of it, and keep your fingers crossed.

There's quite a few regulars in this group that consult; if it breaks in 
a way that convinces the powers that be that it needs a fix in a hurry 
you've got some experts available to trade money for fixes.  Or you can 
ask all the background questions, and we'll help you get through it slowly.

Get Rick Lyons's book ("Understanding Digital Signal Processing").  If 
you can get through it fast enough then maybe by the time the algorithm 
breaks you'll know why and can fix it.

-- 

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

Do you need to implement control loops in software?
"Applied Control Theory for Embedded Systems" was written for you.
See details at http://www.wescottdesign.com/actfes/actfes.html