[mythtv-users] Capturing 5.1 audio

[John DiLorenzo]

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 5.1via coax, and then output via optical? Will I need 2
soundcards in this box?

On 11/12/05, Michael T. Dean <mtdean at thirdcontact.com> wrote:

>
> PVR-150 records NTSC or PAL.
>
> NTSC/PAL don't do 5.1 channel audio--they support only 2-channel stereo
> sound.
>
> Therefore, PVR-150 cannot record 5.1 channel audio.
>
> However, Dolby Surround ( http://en.wikipedia.org/wiki/Dolby_Surround )
> is a technology whereby multiple audio channels (4.0 channels) are
> encoded within a standard 2-channel (stereo) signal and decoded using a
> Dolby Pro Logic ( http://en.wikipedia.org/wiki/Dolby_Pro_Logic )
> decoder. Often, when a show is broadcast (on digital stations) in Dolby
> Digital=AC-3=5.1 ( http://en.wikipedia.org/wiki/Dolby_Digital ), the
> analog stations transmit Dolby Surround encoded in the stereo signal.
>
> The PVR-150 records the stereo signal broadcast with the show, so--in
> theory--it would be possible for Hauppauge to support Dolby Surround.
> However, the PVR-x50's do not contain a Dolby Surround decoder--instead
> only a stereo decoder--so only two channels of audio are encoded in the
> stream.
>
> However, most ALSA drivers will automatically replicate the left- and
> right-front channels to the left- and right-rear (and surround if you
> have a 7.1 channel setup) speakers since it has only a minor effect on
> the perceived positionality of the sounds. If your driver doesn't, you
> can easily add a translation table to your .asoundrc to do it yourself.
>
> If you really want 5.1 channel, though, you'll have to go to a digital
> video broadcast technology (like HDTV (US) or DVB).
>
> Mike
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