OK, so I'm out of luck recording the audio with the PVR-150. How
about the sound card method... Will I be able to use a single soundcard
to capture 5.1 via coax, and then output via optical? Will I need
2 soundcards in this box?<br><br><div><span class="gmail_quote">On 11/12/05, <b class="gmail_sendername">Michael T. Dean</b> <<a href="mailto:mtdean@thirdcontact.com">mtdean@thirdcontact.com</a>> wrote:</span><br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><br>PVR-150 records NTSC or PAL.<br><br>NTSC/PAL don't do 5.1 channel audio--they support only 2-channel stereo
<br>sound.<br><br>Therefore, PVR-150 cannot record 5.1 channel audio.<br><br>However, Dolby Surround ( <a href="http://en.wikipedia.org/wiki/Dolby_Surround">http://en.wikipedia.org/wiki/Dolby_Surround</a> )<br>is a technology whereby multiple audio channels (
4.0 channels) are<br>encoded within a standard 2-channel (stereo) signal and decoded using a<br>Dolby Pro Logic ( <a href="http://en.wikipedia.org/wiki/Dolby_Pro_Logic">http://en.wikipedia.org/wiki/Dolby_Pro_Logic</a> )<br>
decoder. Often, when a show is broadcast (on digital stations) in Dolby<br>Digital=AC-3=5.1 ( <a href="http://en.wikipedia.org/wiki/Dolby_Digital">http://en.wikipedia.org/wiki/Dolby_Digital</a> ), the<br>analog stations transmit Dolby Surround encoded in the stereo signal.
<br><br>The PVR-150 records the stereo signal broadcast with the show, so--in<br>theory--it would be possible for Hauppauge to support Dolby Surround.<br>However, the PVR-x50's do not contain a Dolby Surround decoder--instead
<br>only a stereo decoder--so only two channels of audio are encoded in the<br>stream.<br><br>However, most ALSA drivers will automatically replicate the left- and<br>right-front channels to the left- and right-rear (and surround if you
<br>have a 7.1 channel setup) speakers since it has only a minor effect on<br>the perceived positionality of the sounds. If your driver doesn't, you<br>can easily add a translation table to your .asoundrc to do it yourself.
<br><br>If you really want 5.1 channel, though, you'll have to go to a digital<br>video broadcast technology (like HDTV (US) or DVB).<br><br>Mike<br>_______________________________________________<br>mythtv-users mailing list
<br><a href="mailto:mythtv-users@mythtv.org">mythtv-users@mythtv.org</a><br><a href="http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users">http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users</a><br></blockquote></div>
<br>