On Sunday 27 November 2005 16:26, Michael T. Dean wrote: > Steve Adeff wrote: > >On Sunday 27 November 2005 14:19, Brian Foddy wrote: > > > > > >If you require bit-perfect SPDIF output (DVD's 5.1 HDTV) get a Chaintech > >AV710, they can be had for $25 from newegg > >http://www.newegg.com/Product/Product.asp?Item=N82E16829120103 > >it does true 192/24 (which NONE of the Creative chips do) and does true > >bit-perfect optical digital output. > >Heres a thread about using it in linux: > >http://mysettopbox.tv/phpBB2/viewtopic.php?t=4132&; > > > >really, any of the ENVY24HT based cards are what you want for bit-perfect, > >there are a few out there, with varying levels of SPDIF support (in/out, > >optical/coax) and with DAC of varying levels of quality. Google is your > >friend in this regard. > > What exactly does this mean? If you're doing AC-3 passthrough from > Myth, won't the S/PDIF output be as bit-perfect as was sent to you by > the digital TV broadcaster/DVD production house? Or, are you saying > that some sound card's mangle the stream they're attempting to pass > through? > > Mike
Yes, 'mangle', because the chipset will do freq/bitrate conversion if needed to match the abilities of the output circuitry. If the output circuits can handle 24/196 then no change is needed and the chip just sends out the signal. Creative's output circuits can't handle 24/196 so the signal gets reprocessed to match its output (20/92 iirc). This is whether the signal is DD/DTS or PCM. -- Steve _______________________________________________ mythtv-users mailing list [email protected] http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
