Date: Sat, 2 Sep 2006 13:27:46 +0200 From: Alexander Leidinger <Alexander@Leidinger.net> To: Yuriy Tsibizov <Yuriy.Tsibizov@gfk.ru> Cc: freebsd-multimedia@FreeBSD.org Subject: Re: High quality sound Message-ID: <20060902132746.67eb1eeb@Magellan.Leidinger.net> In-Reply-To: <20060902102020.O970@free.home.local> References: <20060901115216.93B4543D4C@mx1.FreeBSD.org> <20060901144051.9npzkltdr0kkggo0@webmail.leidinger.net> <20060902102020.O970@free.home.local>
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Quoting Yuriy Tsibizov <Yuriy.Tsibizov@gfk.ru> (Sat, 2 Sep 2006 10:45:05 +0400 (MSD)): > > > Quoting "S.N.Grigoriev" <gregory@mdmspb.com> (from Fri, 1 Sep 2006 15:52:13 > > +0400): > > > >> I would like to know if there is a hardware/software combination > >> allowing FreeBSD(amd64) to be a CD player with sound quality > >> comparable with HiFi standalone CD players. > > > > If you talk about off-the-shelf products in the super market: yes, just > > connect the analog audio out of the CD-ROM to your soundcard/soundchip > > (typically the necessary cable comes with the CD-ROM) and use any decent > > multimedia player (most of them are able to play CDs). > > - Some (most?) consumer sound cards will do 44100 -> 48000 upsampling, > distorting sound. > - I can't say anything about quality of DACs on low-cost sound cards. I doubt the resampling will be noticed when compared to the DAC quality and output amplifier sections (including "noise" from the CPU and other parts of the system) of on-board chips. I have a "SoundBlaster Live! USB" and the sound quality between the on-board sound of a laptop and the USB audio device is a huuuuuuge difference. > > If you talk about really high quality stuff (which you don't get at every > > corner on the street), I don't think so. But you can play with digital > > extraction of the audio data from the CD and feeding it to an external DAC > > via the SPDIF interface of the soundcard. > > You should also check that sound card does not do resampling for sound > streams from 44100Hz to 48000Hz (most common value). All emu10k-based > sound cards DO resample ALL DSP inputs to 48kHz, even if you only need to > send S/PDIF stream from CD S/PDIF to optical or coaxial S/PDIF output > (I'm not shure are there any workarounds for this). > > envy24-based cards (from ESI, like Maya44 mkII or Juli@) may work 44100Hz > streams without resampling to 48kHz, but I don't know are they supported > in FreeBSD. Some are supported in -current. I need to get time to commit some further support. This support will not be in 6.2. Bye, Alexander. -- http://www.Leidinger.net Alexander @ Leidinger.net: PGP ID = B0063FE7 http://www.FreeBSD.org netchild @ FreeBSD.org : PGP ID = 72077137
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