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Digital Source Digital Players and Recorders: CD , SACD , Tape, Memory Card, etc.

Looking for tech specs to SACD's equivilant of SPDIF.
Looking for tech specs to SACD's equivilant of SPDIF.
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Old 27th August 2004, 10:59 PM   #11
Jase is offline Jase  Spain
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Default want to read scarlet book

If one of you knows where can i find or download the scarlet book please let me know it.

Also the red book.

Thanks for your help.
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Old 28th August 2004, 02:17 PM   #12
Charles is offline Charles  Germany
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Default Re: Looking for tech specs to SACD's equivilant of SPDIF.

Originally posted by Brian Guralnick
I'm looking for tech specs to SACD's equivilant of SPDIF. In other words, how do they transmit the DSD disc info, or, 6 x 192KHz, 24 bit channels multiplexed on 1 coax, or optical signal.

Is there some sort of "red-book" for SACD?
I think the basic DSD interface (as used in studio equipment) is a three wire coax (BNC) setup, containing:

clock / data right / data left

Whereas data right and data left is just the uncoded flowing sigma delta modulated pulse stream.

The initial idea was to just run this data stream through a lowpass filter (of more or less complexity) and then there was music.

This turned out to be problematic soundwise because of the high levels of high frequency noise of the same kind as found in old 1-bit DAC designs.

See below, the DSD interpretation of a sine-wave.

The funny solution to this dilemma was in decimating the DSD 1-bit stream to 16 or more bits PCM, and then playing through a PCM DAC chip, using multibit or at least multilevel delta-sigma technology (as in the Accuphase DC101). This way at least a decent level of playback quality was possible:

Although, with this decimation process, the complete point of DSD became completely obsolete.

As for transmittance, you can go for seperate coax wires, or use a single multi-wire computer cable and just run out one clock-line and all data-lines (6 x data for 6 channels). Just grab the signals from the DSD converter (i.e. DSD 1702 / 1791, etc...).

This would be the basic DSD interface.

As mentioned in earlier posts, any other interface between SACD-players and receivers is not for public access, as music industry is utterly afraid that anybody would have the rather stupid idea of copying low-resolution DSD recordings.

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Old 28th August 2004, 04:28 PM   #13
Bricolo is offline Bricolo  France
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Isn't the digital out of SACD players muted during a SACD playack? (for copyright reasons)
Just remember: in theory there's no difference between theory and practice. But in practice it usually is quite a bit difference... Bob Pease
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