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Old 4th October 2006, 06:55 AM   #1
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Default 24 bit/192Khz spdif ?

Is there any DVD-ROM or writer that can spew out 24 bit192KHz ( DVD-A playbacK ) spdif signals on its digital output (?) terminal ?
Can one pull it off any point on the pcb ?
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Old 5th October 2006, 12:44 AM   #2
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They all output 16/44.1 the digital out connector is for legacy audio CD playback. To play 24/192 you need DVD-A software and a soundcard giving a 24/192 SPDIF output, which only a few cards can do (Cards with 24/192 analog outputs doesn't mean that SPDIF 24/192 wil actually work. You would need to use I2S instead of SPDIF if you want 24/192
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Old 5th October 2006, 02:03 AM   #3
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DVD-Audio and SACD are digitally crippled formats. Any device that supports these formats will not output them digitally... at least not above 16/44.

You could record the analog outputs with an A/D convertor and master to HDCD. Some DVD players understand HDCD.

Or you could try to find a compromised DVD-Audio software player and record your music to wave. (WinDVD no longer works for this unless you have an old copy) Then you just need a good soundcard to play back. But many sound cards are limited to 24/96 digital. This is still noticeably better than 16/44 and well worth it on good recordings.

On the positive side, DVD-A and SACD still sounded better on my Panasonic receivers using the lackluster analog inputs rather than using 16/44 digital inputs. The Panasonic SA-XR45/XR50 use a TI Equibit digital amp chip that doesnt need to do an A/D conversion when fed a digital signal.

I have a Toshiba portable DVD-A and DVD player whose outputs sound quite nice through headphones.
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Old 5th October 2006, 11:09 PM   #4
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Quote:
DVD-Audio and SACD are digitally crippled formats. Any device that supports these formats will not output them digitally... at least not above 16/44.
In fact, the main reason is that a computer DVD drive will not read a DVD-A as it would read a CD through the headphones output.

To get 24/192 you'll need a 24/192 capable soundcard and pull the I2S stream to the DAC you want to feed with. (SPDIF 24/192 gear seems to exist, but is extremely hard to find)
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Old 5th October 2006, 11:27 PM   #5
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Default interesting - 24bit stuff

Saw this elsewhere in a post: http://www.diykits.com.hk/dac.html

Also almost all of the studio digital / analog / digital stuff is 24bit / 96k to 192k ... check out: http://www.m-audio.com/products/en_u...e410-main.html ... and ... http://rolandus.com/products/product...1&ParentId=114 ...

I don't believe these do any conversions 'tween 16bit to 24 bit and back ... or 'tween SPDIF to 24 bit & back ...

Anyway all of the FireWire connected stuff is a minimum of 24 bit/96k multichannel (a lot of the USB stuff = not).

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Old 6th October 2006, 03:17 AM   #6
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To my knowledge you cant get 24/192 DVD-A without doing something the RIAA doesnt want you to do.

If you want to digitally rip the DVD-A to wave that's possible, but not easy as most software holes have been closed.

Probably best to let the DVD-A and SACD formats die. The RIAA doesnt want us to have good sounding music anymore. They'd prefer to license DRM crippled lossy music at sub-16/44 resolution.

I remember the days when the RIAA actually wanted to make LP's sound good. Oh and there was Dolby and DBX noise reduction for casette tapes.

Now it's overcompressed CD's or MP3's....
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Old 6th October 2006, 03:30 AM   #7
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Default True enough ...

" ... you cant get 24/192 DVD-A without doing something the RIAA doesnt want you to do. ..."

True enough: not allowed.

But in the case of bandwidth (192K) there is no problems putting 96K through it ... so a 24 bit / 192k data frame capable connection can pass a 24 bit / 96K data frame or 16 bit / 44K or whatever within the constraints of the bandwidth allowed.

I have a Pioneer DVD / DVD-A / CD player that claims 24 bit / 96K bandwidth and it plays CD quality 16 bit / 44K CDs without any problems and DVD-A without problems ...

The point is that building for greater bandwidth allows the lesser bandwidth stuff to pass through.

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Old 6th October 2006, 04:22 PM   #8
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Default along this line of thought: ...

... it appears that the pros (studio engineers / recordists / performers / sophisticated garage bands) are beginning to try to do this in a left handed fashion:

A most interesting new device: http://www.m-audio.com/products/en_u...idge-main.html

" ... send up to 32 channels of Lightpipe [SPDIF ?] simultaneously at 44.1 or 48kHzor transfer up to 16 channels at 88.2 or 96kHz using the SMUX protocol. ... " (SPDIF = 16 bit / 44-48 ... SMUX = 24 bit / 96k === each channel, I suppose. Looks like Bob Dylan may get his way "real soon now".)

These kinds of optical devices are primarily intended to reduce / eliminate ground loop problems and power supply isolation between the recording room & sound control booth ... but no telling where they may find other uses ... like maybe my own home system? ... or yours?

I suppoes a system might work like this:

Multiple sources >>to>> the FW mixer above >>to>> sound booth computer >>=>> multiple tracks into big WAV files >>=>> to DVD (A?) or other digital masters >>=>> production DVD-A or other optical disc format ... (Play back = TBD?).

Anyway, I'm off to the AES trade show in San Francisco and these guys are supposed to be there (or at least their engineers = http://www.aes.org/ ). Report to follow (this thread or on another thread). (Trade shows= I hate 'em, but duty calls.)


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Old 6th October 2006, 05:33 PM   #9
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S/MUX has nothing to do with SPDIF.
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Old 6th October 2006, 07:08 PM   #10
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S/MUX allows two ADAT Lightpipe cables to be combined.
Typically ADAT is limited to 48khz. MUX'ing two channels together gets you upto 96khz(maybe higher).

ADAT is not the same thing as SP/DIF. Although, ADAT devices do use the same toslink style connectors.

I believe there are better ways to transmit multiple channels of audio than ADAT. But ADAT seems very, very common.
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