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Author Topic: ratshack digital signal converter testing :)  (Read 22712 times)

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Offline sleepypedro

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Re: ratshack digital signal converter testing :)
« Reply #15 on: July 19, 2004, 01:31:01 PM »
i'm on the phone right now with paul, and sony does indeed still have the 7-pin / mini-toslink cable.  i've got one ordered.

wow, i might be back in action with the jb3!

Offline Chris K

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Re: ratshack digital signal converter testing :)
« Reply #16 on: July 19, 2004, 05:00:29 PM »
still $85?

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Offline dr.ph0b

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Re: ratshack digital signal converter testing :)
« Reply #17 on: July 20, 2004, 02:19:04 AM »
Does it send signal to the coax and optical ouputs at the same time?? I have the cheap sliver box convertor this looks like it could be a step up

yeppers. i have a coax input and it outputs to both optical and coax simultaneously
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Offline F.O.Bean

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Re: ratshack digital signal converter testing :)
« Reply #18 on: July 20, 2004, 09:09:06 AM »
it only converting signal, not the data.

isnt the signal technically data tho ???

so bit-perfectness would matter
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Offline hoobash

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Re: ratshack digital signal converter testing :)
« Reply #19 on: July 20, 2004, 09:21:43 AM »
Sold!!! I am pick one up

Does it send signal to the coax and optical ouputs at the same time?? I have the cheap sliver box convertor this looks like it could be a step up

yeppers. i have a coax input and it outputs to both optical and coax simultaneously

Offline hoobash

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Re: ratshack digital signal converter testing :)
« Reply #20 on: July 20, 2004, 09:22:52 AM »
Has there been a issue with these things loosing data?? Its not like a has sample rate convertion

it only converting signal, not the data.

isnt the signal technically data tho ???

so bit-perfectness would matter

Offline Brian Skalinder

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Re: ratshack digital signal converter testing :)
« Reply #21 on: July 20, 2004, 11:12:06 AM »
Has there been a issue with these things loosing data??

That's what we're trying to find out.  With other digital format converters (DFCs), yes, users have encountered issues - dropped samples, introduction of artifacts, etc.

Its not like a has sample rate convertion

No, but the DFCs are built to convert a S/PDIF coax signal to optical.  However, virtually no manufacturer follows the S/PDIF standard.  Since the S/PDIF source and the DFC both may not follow the S/PDIF standard, the combination of the two non-standard S/PDIF specs may create a situation where the DFC has trouble converting the signal it's receiving because the signal falls near our outside it's specified tolerance.  The problems may appear readily and audibly in a short test.  The problems may not occur audibly initially, but perhaps reveal themselves over time.  Or the source device + DFC may have not problems at all.  We don't know, and I believe that's the point Bean is trying to make.

I haven't seen any mention by Dr. Phob that he's listened to the complete recorded WAVs (20+ hrs) to identify if they contain audible dropped samples or artifacts, nor have I seen indication he's checked them for bit accuracy against a control file.  IME, it's much easier - and more authoritative - to verify bit-accuracy than casually listen to the WAVs played back.  If the DFC proves bit-accurate under controlled conditions, I would hold a high degree of confidence using it in the field.  If it does not prove bit-accurate, I would have very little confidence using the DFC in the field.  If it is not bit-accurate, but the DFC doesn't present audible dropped-samples or artifacts under a short duration of testing, I still would have very low confidence - if it isn't bit-accurate, then something is not functioning properly in the source signal > DFC > target recorder chain and IMO this something will eventually manifest itself in audible artifacts or dropped samples.

Given history of people trying various DFCs and encountering trouble with them, I wouldn't trust this particular DFC (or any other one, for that matter) until I had a chance to verify it's bit-accuracy.  This is exactly why I tested the Hosa ODL-312 before using it widely in the field.
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Offline F.O.Bean

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Re: ratshack digital signal converter testing :)
« Reply #22 on: July 20, 2004, 11:26:58 AM »
great post brian :)
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Offline Lil Kim Jong-Il

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Re: ratshack digital signal converter testing :)
« Reply #23 on: July 20, 2004, 11:53:00 AM »
However, virtually no manufacturer follows the S/PDIF standard. 

I assume you meant the electrical interface?  Can you elaborate?

Most of these cheap little DFCs are just a TTL buffer with optical coupler on either side and pulse transformers for the coax interface.  You'd have to really fuck it up to fall outside of spec with the signal at the connector.
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Offline bhtoque

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Re: ratshack digital signal converter testing :)
« Reply #24 on: July 20, 2004, 01:33:28 PM »
those optical splitter can really screw with a jb3 recording

they work great with md decks i hear, but a jb3 is kinda picky and when you just split the light signal like that it causes problems with the jb3

I can't get my jb3 to work at all through one of those splitters, but the converter is sweet.

I've listened to about 15 hours of shows I've done through it to my md (which I use as backup) and have had no audible problems. I run my jb3 off the ua-5's optical and the converter off the coax so I don't run either deck analog.

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« Last Edit: July 20, 2004, 01:37:52 PM by bhtoque »
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Offline hoobash

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Re: ratshack digital signal converter testing :)
« Reply #25 on: July 20, 2004, 02:22:03 PM »
So who is going to test this thing?

Offline Brian

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Re: ratshack digital signal converter testing :)
« Reply #26 on: July 20, 2004, 02:24:07 PM »
it would appear Dr Phob has stepped up to the plate. we haven't heard from him today though so who knows how his in house test went yesterday as far as bit accuracy.

Offline ChrisV

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Re: ratshack digital signal converter testing :)
« Reply #27 on: July 20, 2004, 02:37:13 PM »
Can't wait to hear the results on the bit-accuracy....if it is that will be a huge find and cheap alternative.   Even if not, I may just pick one up for patchers anyways.
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Offline Cooker

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Re: ratshack digital signal converter testing :)
« Reply #28 on: July 20, 2004, 08:00:12 PM »
well i have two of those splitters, and never got them to work right with the jb3 or SBM-1 > Splitter > PCM-M1 and Sharp 831 MD

only time i got them to work were going ultramatch > Pioneer MD and Pioneer Standalone


Offline hoobash

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Re: ratshack digital signal converter testing :)
« Reply #29 on: July 20, 2004, 09:53:07 PM »
I picked one of these up today. I has to be as good as the little sliver box i have

 

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