Audio Connection Confusion

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LouisW
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Joined: Jul 22 2002

I finally bought a DVD writer and replaced my CD writer with it yesterday. In fiddling around with my system to see if I could connect audio cables from both the DVD writer and the CD-ROM to my Sound Blaster Live, I found to my surprise that even with NEITHER ROM drive connected to my audio card I get audio from BOTH. If the system pulls the aaudio off the CD/DVD as data via the ribbon cable and feeds it to the audio card through the PCI bus, what is the 3 or 4 wire audio cable provided with every CD/DVD drive for?

Also, both the DVD writer and my audio card have digital SPDIF ports. Should I get an SPDIF cable and connect them that way?

Thanks,
Louis

harlequin
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Joined: Aug 16 2000

the 3 or 4 wire connections are to pass analogue sound to an analogue connector , not necessarily a sound card , could be a dvd decoder card

the 2 pin spdif connector transfers digital signal from cd/dvd to sound card / whatever it is connected to , say a 5.1 amp.

the ide cable carries whatever signals it gets and therefore can bypass the audio card totally and send the signal anywhere that is connected to the motherboard.

the spdif will deliver the best quality.

Gary MacKenzie

sepulce@hotmail.com ( an account only used for forum messages )

Thinkserver TS140 , 750ti Graphics card  & LG 27" uws led backlight , Edius 8

Humax Foxsat HD Pvr / Humax Fox T2 dvbt

LouisW
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Joined: Jul 22 2002

Thanks, Gary.

So I guess there's no reason ever to put a cable between the analog output on a CD or DVD player and the analog input on a sound card; those connectors are onlu to connect these devices to other devices that have only an analog connection.

I'll try a digital cable on the DVD writer and see if I can discern a difference. Do I need to do anything to 'enable' it or to 'disable' audio data transfer via the data bus?

Thanks again,
Louis

harlequin
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Joined: Aug 16 2000

quote:Originally posted by LouisW:
Thanks, Gary.

So I guess there's no reason ever to put a cable between the analog output on a CD or DVD player and the analog input on a sound card; those connectors are only to connect these devices to other devices that have only an analog connection.

I'll try a digital cable on the DVD writer and see if I can discern a difference. Do I need to do anything to 'enable' it or to 'disable' audio data transfer via the data bus?

Thanks again,
Louis

pass , i select the digital connection within my soundblaster live mixer control.
that may well stop the transfer across ide.

Gary MacKenzie

sepulce@hotmail.com ( an account only used for forum messages )

Thinkserver TS140 , 750ti Graphics card  & LG 27" uws led backlight , Edius 8

Humax Foxsat HD Pvr / Humax Fox T2 dvbt

Nigel Longman
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Joined: Apr 28 1999

Louis

I'm interested in this topic too. I wonder if you could confirm:

1) Are you playing normal audio CDs, DVDs or CDs with wav or MP3 files on them?

2) Which volume slider on the audio card mixer controls the volume of the sounds?

3) What software player you are using?

Thanks for your time.

Nigel

LouisW
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Joined: Jul 22 2002

1) Are you playing normal audio CDs, DVDs or CDs with wav or MP3 files on them?

I play audio CDs, MP3s, and videos (mostly music videos) in various formats (MPEG, WMV, WMA, AVI, etc.) and, now that I have DVD player/writer, I will play DVDs.

2) Which volume slider on the audio card mixer controls the volume of the sounds?

For a music CD, the "CD Audio" slider. For videos, the "Wave" slider.

3) What software player you are using?

I usually use Windows Media Player 9.

Louis

Nigel Longman
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Joined: Apr 28 1999

Thanks for this info Louis, but I find I still have to have the analogue lead from the CD/DVD ROM connected to hear CD Audio from my sound card. As you say, wav, mp3 and other files don't need this and are played over the pci bus, their volume being controlled by the 'wave/MP3' level control.

Thanks NL

harlequin
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Joined: Aug 16 2000

from a newsgroup posting:

Windows Media player is supposed to be able to play an audio CD in analog mode
(volume controlled by "CD Audio" slider) or digital mode (volume controlled by
Wave slider). Digital mode here means that the audio is read via DAE, converted
to a wave file and played. It does NOT mean that a digital SPDIF output of the
CD-ROM drive is used, in fact this is not the case at all, the signal path is
via the IDE (or SCSI) drive data connector.

Well, Windows Media Player apparently has a problem doing digital playback in
systems with more than one IDE CD-ROM drive (for this purpose, DVD's and CD-R
burners count as CD-ROM drives). Which is why I had been pulling my hair out
for two days trying to get digital playback to work.

Gary MacKenzie

sepulce@hotmail.com ( an account only used for forum messages )

Thinkserver TS140 , 750ti Graphics card  & LG 27" uws led backlight , Edius 8

Humax Foxsat HD Pvr / Humax Fox T2 dvbt