Re: AW: usb quattro

[Patrick Shirkey <pshirkey@boosthardware.com>]

Patrick Shirkey wrote:

>>
>> the resolution of usb-audio device is 1ms.  this value is fixed.
>> thus you need to adjust the period size according to the sample rate
>> if you want to achieve the real-time response with a small period
>> size.
>>
>> that means:
>> - the sample rate should be 48kHz (or 32kHz), which can be divided by
>>   1000, and should not be 44.1kHz.
>> - the period size should be aligned to (rate / 1000).
>>   in the case of 48kHz, the period size should be 48, 96, 192, ...
>>
>> please try this combination.
>>
>>
> 
> Takashi you little beauty :)
> 
> The sound is infinitely better.
> 
> I'll add a note to the docs.
> 
> Hmm. Now I have no excuses when people ask to hear my music though ;)
> 

Blah. I spoke too soon. I should have been worried when it was so easy.

I can get much better sound quality using this:

jackd -v -R -d alsa -d q4 -p 1152

which is through the plug layer. Currently the hw layer produces white 
noise.

I will have to track down the correct settings.



-- 
Patrick Shirkey - Boost Hardware Ltd.
For the discerning hardware connoisseur
Http://www.boosthardware.com
Http://www.boosthardware.com/LAU/guide/
========================================

"Um...symbol_get and symbol_put... They're
kindof like does anyone remember like get_symbol
and put_symbol I think we used to have..."
- Rusty Russell in his talk on the module subsystem



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