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#1
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SPDIF to AES/EBU
Does anyone have the circuit for an adapter between these formats? I have
seen a little in-line adapter and am wondering what's inside. |
#2
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SPDIF to AES/EBU
Charles Robertson, Psy.D. wrote:
Does anyone have the circuit for an adapter between these formats? I have seen a little in-line adapter and am wondering what's inside. It's a simple transformer - 75 ohm unbalanced to 110 ohm balanced. Artie Turner |
#3
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SPDIF to AES/EBU
Charles Robertson, Psy.D. wrote:
Does anyone have the circuit for an adapter between these formats? I have seen a little in-line adapter and am wondering what's inside. It's a transformer. And all it does it change the levels and impedance, it doesn't alter the subcode. I think the Schott Transformers folks have schematics for these things in their catalogue and they might be on the website too. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#4
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SPDIF to AES/EBU
"Artie Turner" wrote in message . .. Charles Robertson, Psy.D. wrote: Does anyone have the circuit for an adapter between these formats? I have seen a little in-line adapter and am wondering what's inside. It's a simple transformer - 75 ohm unbalanced to 110 ohm balanced. Artie Turner Isn't there a little more though. AES/EBU has no SCMS, it has some other information in there. S/P-DIF to AES/EBU works fine. AES/EBU to S/P-DIF will sometimes fail because the S/P-DIF unit may interpret some bits as copy protection. That is if the unit incorporates SCMS. Richard |
#5
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SPDIF to AES/EBU
rich rookie wrote:
"Artie Turner" wrote in message . .. Charles Robertson, Psy.D. wrote: Does anyone have the circuit for an adapter between these formats? I have seen a little in-line adapter and am wondering what's inside. It's a simple transformer - 75 ohm unbalanced to 110 ohm balanced. Artie Turner Isn't there a little more though. AES/EBU has no SCMS, it has some other information in there. The guy asked for a circuit, for what was inside, and it really is just a transformer. You are right that the SPDIF subcode is not compatible with AES/EBU, but the audio data is essentially the same. S/P-DIF to AES/EBU works fine. AES/EBU to S/P-DIF will sometimes fail because the S/P-DIF unit may interpret some bits as copy protection. That is if the unit incorporates SCMS. That could be, but I've never seen it happen, and I transfer stuff to and from my old SPDIF DAT recorder and my AES/EBU soundcard with a Canare BULUN transformer. Works like a champ. AT Richard |
#6
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SPDIF to AES/EBU
"Artie Turner" wrote in message . .. rich rookie wrote: "Artie Turner" wrote in message . .. Charles Robertson, Psy.D. wrote: Does anyone have the circuit for an adapter between these formats? I have seen a little in-line adapter and am wondering what's inside. It's a simple transformer - 75 ohm unbalanced to 110 ohm balanced. Artie Turner Isn't there a little more though. AES/EBU has no SCMS, it has some other information in there. The guy asked for a circuit, for what was inside, and it really is just a transformer. You are right that the SPDIF subcode is not compatible with AES/EBU, but the audio data is essentially the same. S/P-DIF to AES/EBU works fine. AES/EBU to S/P-DIF will sometimes fail because the S/P-DIF unit may interpret some bits as copy protection. That is if the unit incorporates SCMS. That could be, but I've never seen it happen, and I transfer stuff to and from my old SPDIF DAT recorder and my AES/EBU soundcard with a Canare BULUN transformer. Works like a champ. Oh, I agree. I've actually not seen it happen either. And I also have transferred a lot of material between my S/P-DIF DAT and AES/EBU equipment. It turns out I need to use a logic level shifter, so a simple transformer won't work for me. But that's just the DAT manufacturer's fault. It could happen and if you're not aware of the potential, it could drive you crazy. Richard |
#7
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SPDIF to AES/EBU
"Charles Robertson, Psy.D." wrote in message ... Does anyone have the circuit for an adapter between these formats? I have seen a little in-line adapter and am wondering what's inside. http://www.rane.com/note149.html /Preben Friis |
#8
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SPDIF to AES/EBU
Just a note - before getting into anything fancy, you could try simply
using an RCA-XLR cable. Of course this ignores all the issues of voltage, impedance, signal format, etc... But in some cases it works. (I hook up my Delta sound card to a DAT deck this way). Dan |
#9
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SPDIF to AES/EBU
"Charles Robertson, Psy.D." wrote in
message Does anyone have the circuit for an adapter between these formats? I picked up some transformers that do the job, from markertek for a reasonable price. I have seen a little in-line adapter and am wondering what's inside. A transformer. By the time you buy the transformer and two connectors, the commercial adapters start looking pretty good. |
#10
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SPDIF to AES/EBU
Dan Maas wrote:
Just a note - before getting into anything fancy, you could try simply using an RCA-XLR cable. Of course this ignores all the issues of voltage, impedance, signal format, etc... But in some cases it works. (I hook up my Delta sound card to a DAT deck this way). Many recent hardware implementations have sufficient source current on the output and receiver AGC on the input that they can handle this, at least for short cables. If you're dealing with any serious amounts of line length, it's worth investing in a balun or two to properly terminate the line. |
#11
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SPDIF to AES/EBU
Artie Turner wrote:
Charles Robertson, Psy.D. wrote: Does anyone have the circuit for an adapter between these formats? I have seen a little in-line adapter and am wondering what's inside. It's a simple transformer - 75 ohm unbalanced to 110 ohm balanced. Artie Turner Not possible. AES/EBU works at a higher voltage as well as a slightly different impedance. Any unit using just a transformer won't be a reliable source. Graham |
#12
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SPDIF to AES/EBU
In Article , "Charles Robertson, Psy.D."
wrote: Does anyone have the circuit for an adapter between these formats? I have seen a little in-line adapter and am wondering what's inside. Graham Patten makes one. I think there's just a transformer inside. Not certain though. Ty Ford **Until the worm goes away, I have put "not" in front of my email address. Please remove it if you want to email me directly. For Ty Ford V/O demos, audio services and equipment reviews, click on http://www.jagunet.com/~tford |
#13
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SPDIF to AES/EBU
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#14
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SPDIF to AES/EBU
Pooh Bear wrote:
Artie Turner wrote: Charles Robertson, Psy.D. wrote: Does anyone have the circuit for an adapter between these formats? I have seen a little in-line adapter and am wondering what's inside. It's a simple transformer - 75 ohm unbalanced to 110 ohm balanced. Artie Turner Not possible. AES/EBU works at a higher voltage as well as a slightly different impedance. I'm not sure if you know what a transformer does; it "transforms" voltage and impedance to match the source to the load. Any unit using just a transformer won't be a reliable source. Works every time for me. Artie Graham |
#16
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SPDIF to AES/EBU
Dan Maas wrote:
Just a note - before getting into anything fancy, you could try simply using an RCA-XLR cable. Of course this ignores all the issues of voltage, impedance, signal format, etc... But in some cases it works. (I hook up my Delta sound card to a DAT deck this way). Actually, the distinction between AES and SPDIF has nothing to do with physical characteristics such as RCA and XLR connectors. It has to do with how the information is encoded. It is very possible for an AES signal to travel down a 75 ohm line with RCA connectors. In fact, it probably happens more often than you think! Rob R. |
#17
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SPDIF to AES/EBU
Rob Reedijk wrote:
Actually, the distinction between AES and SPDIF has nothing to do with physical characteristics such as RCA and XLR connectors. Both, actually. It has to do with how the information is encoded. The vast majority of which is the same for both formats. It is very possible for an AES signal to travel down a 75 ohm line with RCA connectors. In fact, it probably happens more often than you think! AES3id specifies 75 Ohm coax and BNC connectors and is preferred by some users over the 110 Ohm balanced lines of AES3. |
#18
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SPDIF to AES/EBU
Artie Turner wrote:
Pooh Bear wrote: AES/EBU works at a higher voltage as well as a slightly different impedance. I'm not sure if you know what a transformer does; it "transforms" voltage and impedance to match the source to the load. Any unit using just a transformer won't be a reliable source. Works every time for me. You're lucky then. I'm assuming a 1:1 transformer typically. Trouble is, IEC 60958 specifies AES/EBU as 5V pk-pk and SPDIF as 0.5V pk-pk. Some equipment may vary from this spec. So your AES receiver will see 1/10 th of its intended input. You're likely to see problems with the 'eye pattern' and likely corrupted bits and frames, sesp when using any length of cable. See this : http://www.murraypro.com/spdif.htm as an example of how to do it properly. Graham |
#19
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SPDIF to AES/EBU
Mike Rivers wrote:
In article writes: Not possible. Very possible. On a good day with the wind behind you maybe. Depends on the receiver performance. AES/EBU works at a higher voltage as well as a slightly different impedance. That's what the transformer does - rasies the voltage and impedance. Ok, AES/EBU has a specified operating level of 5V pk-pk whereas SPDIF is just 500mV. A 10:1 step up transformer will raise the impedance by 100x. therefore 75 ohms source 7k5 ohms on the secondary, not 110 ohms ! Since you have to pay for IEC 60958, suggest you look here. http://www.cirrus.com/en/pubs/proDat.../CS8405A-5.pdf Section 14. Appendix A, page 35. Specifies operating levels etc for AES/EBU and SPDIF. Any unit using just a transformer won't be a reliable source. It's as reliable when converted as the original source is. Of course it's better to have matching hardware, but we always have to make adjustments because we don't buy all our equipment together every time we make a purchase. The data stream is compatible, the interface levels aren't. You're playing with fire. It's a bit like saying you can plug an electric guitar pickup into a low-Z mic pre-amp. It kinda works. Hope you don't drop too many bits, or frames ! Here's an example of the professional way to do it. It will also 'clean up' the transitions. http://www.murraypro.com/spdif.htm Graham |
#20
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SPDIF to AES/EBU
rich rookie wrote:
It turns out I need to use a logic level shifter, so a simple transformer won't work for me. But that's just the DAT manufacturer's fault. It's not the fault of the DAT manufacturer. They probably designed to IEC 60958. AES/EBU and SPDIF logic levels are *not* compatible officially. Some equipment may work. It's your risk. It could happen and if you're not aware of the potential, it could drive you crazy. Yes ! Graham |
#21
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SPDIF to AES/EBU
"Pooh Bear" wrote in message ... rich rookie wrote: It turns out I need to use a logic level shifter, so a simple transformer won't work for me. But that's just the DAT manufacturer's fault. It's not the fault of the DAT manufacturer. They probably designed to IEC 60958. All the other information about this not withstanding. On my DAT, a Sony, the "1" volatage level is some strange voltage like 1.4V. I forget exactly the levels though, it's been a long time since I looked. Richard |
#22
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SPDIF to AES/EBU
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#23
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SPDIF to AES/EBU
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#24
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SPDIF to AES/EBU
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#26
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SPDIF to AES/EBU
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