[mythtv-users] re: DRAFT of proposed new FAQ (or HowTo section)

[Gerald Britton]

On Wed, Jun 25, 2003 at 12:56:14PM -0700, Bruce Markey wrote:
> I never really bought into this mono vs stereo thing. The
> TV audio analog signal includes whatever the station is
> broadcasting. Some stations/shows have two channel stereo.
> Some station/channels use Dolby ProLogic to encode surround
> information into the two audio tracks.

Remember though.. TV audio is backward compatible, it's a mono signal with
the stereo overlaid ontop of that.

> If you use the patch cord from the audio out of the capture
> card to line-in of a soundcard, the audio out seems to be
> a simple analog connection over a stereo mini phono jack.
> I've never seem a card come with a mono phono jack patch
> cable. The soundcard then digitizes the audio tracks. If
> you're soundcard/receiver/speakers handle ProLogic, you
> get surround sound.

I have a tv capture card with a mono sound jack, they do exist.

> Now, some *boxes* may say that the card has dbx-stereo. This
> is because they have a stereo DSP chip on the card. If you
> can get btaudio to work, it would record stereo including
> the surround encoding. Boxes for cards that don't include
> a DSP are not marked as stereo (and are therefore preceived
> as being mono?).

Ones that advertise stereo have stereo tv audio decoders in them,
the mono cards are only capable of grabbing the mono broadcast
audio out of the air even if they might have a stereo minijack and
send the output to both channels.

				-- Gerald