SACD can be transmitted over firewire using the IEC61883-6 standard.
I've heard that some upcoming transports & DACs will support this but no specifics.
If you are not a corporation you probably will not have access to this. It seems unlikely there will be any SACD IEC61883-6 integrated device chips.
I've heard that some upcoming transports & DACs will support this but no specifics.
If you are not a corporation you probably will not have access to this. It seems unlikely there will be any SACD IEC61883-6 integrated device chips.
BTW, can anyone explain to me why SACD, or more specifically the DSD format, is supposed to be superior to the CD system? Never understood why people are so mad about it. Ok, there are more channels, but...
Even when you get the DSD out of your box, all you can do is connect some DSD DACs to it. There are not many on the market, and one or more of them is in your SACD player anyway. Some SACD players even convert to PCM before doing the D/A conversion. Kind of defeats the argument that DSD is superior to PCM, doesn't it? Modding seems the better approach here.
Or you can go through the hassle of getting DSD out of your box, build a receiver on the other end, convert it to PCM and connect some of the many I2S input DACs to it. That way, you have as much digital processing between the original sound event and the reproduction in your room as possible:
A/D-conversion through delta sigma converters, 6.14MHz ->
Converting to 96kHz/24 bit PCM for storage, mixing, DSP and mastering ->
Converting to DSD 2.8MHz for SACD ->
Converting back to 96kHz/24bit PCM for your DAC.
It's music that's put through these number crunchers.
Even when you get the DSD out of your box, all you can do is connect some DSD DACs to it. There are not many on the market, and one or more of them is in your SACD player anyway. Some SACD players even convert to PCM before doing the D/A conversion. Kind of defeats the argument that DSD is superior to PCM, doesn't it? Modding seems the better approach here.
Or you can go through the hassle of getting DSD out of your box, build a receiver on the other end, convert it to PCM and connect some of the many I2S input DACs to it. That way, you have as much digital processing between the original sound event and the reproduction in your room as possible:
A/D-conversion through delta sigma converters, 6.14MHz ->
Converting to 96kHz/24 bit PCM for storage, mixing, DSP and mastering ->
Converting to DSD 2.8MHz for SACD ->
Converting back to 96kHz/24bit PCM for your DAC.
It's music that's put through these number crunchers.
SACD
Hi AMT-freak.
You are right aout the production process of SACD's. The ones made directly to DSD sound the best. Old PCM recordings or analog recordings immediately make a clean breast of it.
The masterclock in a SACD player like the Sony SCD-1 is even more critical than in a CD-player. I am lucky I got mines working.
To get an idea of the signals used by SACD have a look at the datasheet of the DSD1700 from www.ti.com)
Hi AMT-freak.
You are right aout the production process of SACD's. The ones made directly to DSD sound the best. Old PCM recordings or analog recordings immediately make a clean breast of it.
The masterclock in a SACD player like the Sony SCD-1 is even more critical than in a CD-player. I am lucky I got mines working.
To get an idea of the signals used by SACD have a look at the datasheet of the DSD1700 from www.ti.com)
AFAIK there are only two SACD products out there with seperated drive and converter units. First ist dcS Verdi (drive) / Purcell (converter) which use IEEE 1394 (Fire Wire). Second is from Accuphase (DP-100 / DC-101) and uses a proprietary format on a, if I recall it correctly, LVDS based system.
Re: SACD
Wow, a lot to go through. My requests to Analog devices specs on the DSD port of their AD1955 have yet to be answered.
Great, is there an available online copy? Do you have a link?
I believe that DSD is not a 192KHz 24bit data/channel, it's the raw pulsing from the comparator in the AD converter running at 2.xxx Mhz. This is then fed to the dac running at the same rate. I guess, in theory, you can sample and recreate over 500Khz bandwidth signals with these recordings, as per the DSD bandwidth charts within the AD1955 documentation.
This is pretty sad. I believe that the day compact discs were released to the consumer market, the SPDIF format was already standardized.
Wow, a lot to go through. My requests to Analog devices specs on the DSD port of their AD1955 have yet to be answered.
Considering most of the public is happy with MP3 (yuk,blech,cough) I don’t think they need to worry about people pirating the extra minimal available DSD format discs. These discs are only a minor % of the available SACD format discs, which are also a minor % of normal compact discs.AMT-freak said:
rfbrw said:
Great, is there an available online copy? Do you have a link?
Elso Kwak said:Hi AMT-freak.
You are right about the production process of SACD's. The ones made directly to DSD sound the best.
I believe that DSD is not a 192KHz 24bit data/channel, it's the raw pulsing from the comparator in the AD converter running at 2.xxx Mhz. This is then fed to the dac running at the same rate. I guess, in theory, you can sample and recreate over 500Khz bandwidth signals with these recordings, as per the DSD bandwidth charts within the AD1955 documentation.
HBarske said:
This is pretty sad. I believe that the day compact discs were released to the consumer market, the SPDIF format was already standardized.
Yep, but I know of no DVD-Audio capable player which would output more than 44.1KHz/16bit/stereo digitally via S/PDIF. There are some that output a 96kHz/24bit/stereo data stream or multi-channel formats, but only when playing back DVD-Video. So you have no possibility of making high resolution digital copies of DVD-A without tampering the I2S lines in the player.
My point was that the same is true for SACD players. No standard output for high resolution digital audio. And I think the only reason is avoiding high res copies.
True. I think you were misunderstood from your first post. Converting DSD to PCM is a lossy operation.
In theory, yes. But, unlike PCM, the dynamic range of DSD is dependent on the frequency of your signal. The higher the frequency, the worser the dynamic range and the closer the noise floor. CD beats SACD from about 5kHz upwards in that respect! Compare this to the constant 144dB dynamic range of DVD-Audio. High resolution in the human hearing frequency range is much more important than reproducing frequencies of up to 500kHz (with -20dB noise floor).
AMT-freak said:
I know the human ear alone can't handle these high frequencies, but, the phase of these high frequency signals, above 5Khz, on a 2 channel system defines far superior imagery with instruments like cymbals & even helps reproduce far more accurate lower frequency complex rattle noises, like the springs underneath a snare drum.
This DSD format reminds me of the great audio potential of my old Sony SLV-757UC VHS Hi-Fi's audio. Though it's 1.8 & 1.2 MHz FM, 500Khz bandwidth for the sound. Even on EP, I've measured a good flat response from 5hz to over 30Khz for full amplitude signals, for half amplitude, over 50Khz, for 1/8th amplitude, over 80Khz.
Brian Guralnick said:
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.
http://www.mother-of-tone.com/PCM Gifs/1-bit_green.jpg
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:
http://www.mother-of-tone.com/PCM Gifs/3-bit_green.jpg
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.
Charles
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