From mboxrd@z Thu Jan 1 00:00:00 1970 From: Patrick Shirkey Subject: Re: AW: usb quattro Date: Mon, 09 Sep 2002 22:32:47 +0900 Sender: alsa-devel-admin@lists.sourceforge.net Message-ID: <3D7CA2FF.2030705@boosthardware.com> References: <3D77A319.3010703@boosthardware.com> <3D7912A2.1000908@boosthardware.com> <3D7C8C53.7060001@boosthardware.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Return-path: Errors-To: alsa-devel-admin@lists.sourceforge.net List-Help: List-Post: List-Subscribe: , List-Unsubscribe: , List-Archive: Cc: Takashi Iwai , alsa-devel@lists.sourceforge.net List-Id: alsa-devel@alsa-project.org 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 ------------------------------------------------------- This sf.net email is sponsored by: OSDN - Tired of that same old cell phone? Get a new here for FREE! https://www.inphonic.com/r.asp?r=sourceforge1&refcode1=vs3390