There's some confusion in the last post. All CD's are digital. The issue
was that for a long time CD roms/writers included the Digital to Audio
chip and amplifier, just like all CD players do, to provide an analoge
signal for the next stage. That is what the audio cable was for. The
jack on the front of the CD rom was fed by that included DA chip and amp
onboard the CD rom. 

If that jack is no longer on the front of the player and there's no
audio out on the back, it is not because the signal is being fed some
other way. (I think) It is that there is no longer any on-board DA
processing and amplification being done. 

said Harry, stirred by:
     kevinjjcan{at}rogers.com's message of:
     Saturday 14 Apr 07 at 06:04 PM,
     On: Re: [OS2HW] Audio
     [echoed below, in part<=1]
                      -oOo-

Hi, I just inserted a CD of the Moody Blues, I assume that is an
ANALOGUE CD, and low and behold, yes there is audio.

Nero just advises when disk info is requested that it is a CD. I don't
know of any other tool to advise more.

So thanks Jimmy, for the advice.

KevinJ.


----- Original Message ----
From: "rallee2{at}comcast.net" 
To: os2hardware{at}yahoogroups.com
Sent: Saturday, April 14, 2007 4:47:29 PM
Subject: Re: [OS2HW] Audio

Just a guess......
Do you have an HDCP compliant video card? There are new formats such as
HDCP wherin audio and video are transmitted on the same cable. I can't
recall offhand if DVI outputs have such capability but I have a GeForce
7900GT made by MSi that is fully HDCP compliant and apparently it can,
with proper connector/cable send both audio and video on the one cable.
This leads me to believe that modern DVD drives may send both digital
audio and video to the mainboard on the main cable. In addition my SATA
optical drive, a Plextor PX-716SA, has *no* audio connector at all on
the drive! So in this case audio is certainly sent within the normal
signal lines on the main connecting cable. Hope this helps some at
least in suggesting what must be occurring since it is certainly not
wireless and as you said no dedicated audio cable is present. Jimmy
------------ -- Original message ------------ --------- -
From: Kevin Johnson 
> Hi All,
> 
> I'm mystified, which is quite easy to do. I upgraded 'puter with 
> PCCHIPSp4m800pro, intel 3.2 and included a DVD rw.
> 
> This motherboard has AC97 audio. and here's the mystifying part, I
did not use a 
> audio cable from the DVD to anywhere on the
> motherboard or it's cards. The point is I can play a movie DVD with SOUND. How 
> is this possible???? ????????? ?
> 
> The DVD player is straight run of the mill IDE (80 pin cable), with
the normal 4 
> prong power cable.
> 
> I did install a Geniatech AS8000 TV card which is HDTV capable and
works great, 
> but it too does not require any audio connection, just fits in a PCI slot.
> 
> Any or all clarifications would be appreciated.
> 
> Dual posted because I don't know the answer.
> 
> Regards
> 
> KevinJ.
> 
> [Non-text portions of this message have been removed]
> 

[Non-text portions of this message have been removed]




[Non-text portions of this message have been removed]


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