Don't forget why units like the ADA80000 and the Ai3 are so popular.
:roll:
... ease of use and connection to an existing system.
Word clock is all very well BUT it doesn't fit everyones situation.
192k really doesn't have anything to do with Adat Lightpipe.
SMpro is another simple choice for a DIY unit
http://www.onlinerock.com/mf_store/brands/s/SMPro_Audio/SMPro_Audio_PR-8_MKII_ADAT_Option_240161.htm
BUT no lightpipe return to clock too !!
IF you are adding a Lightpipe box to a 001 , 002 or even an HD96IO then the
B unit (ADA80000) or the
A unit (Ai3) offer a simple slave that is very well behaved.
AND cheaper that I can make it for.
http://www.audient.co.uk/
Audient too has an 8 Mic unit with word clock ... again no Lightpipe return/loop to clock to so must be master.
Tascam Digital desks and 02R's have the Lightpipe option.
BUT in a multiple setup things can go wrong even with clock distribution as the Opto rec and send chips often don't external sync well ... they seem to chase Lightpipe better.
:shock: ... :roll:
sorry
looks like Kev is in rave mode
LOOK at the Wavefront web page for many of the details and facts about what and how Lightpipe works.
http://www.wavefrontsemi.com/
http://www.wavefrontsemi.com/products.html ... read all the extra documents !
http://www.profusionplc.com/ to purchase these chips
Just because you have word clock doesn't mean the problems are solved.
Crystal Labs have some chips that may offer more or better features but not that I have seen work ... yet
http://www.cirrus.com/en/products/
??? is that the right site ?? looks different
A good discussion over at the Recpit and some arguing over the merits of 192k ... fascinating stuff over at PSW in Dan Lavry's forum
http://recforums.prosoundweb.com/index.php/t/2133/0
and many others
like word clock
http://recforums.prosoundweb.com/index.php/t/2133/0
this has a direct bearing on how the unit performs in a chase mode
... all too complicated to for a simple Lightpipe interface question ... especially when it is for a unit at the bottom of the food chain.
Being an early ADAT user and multiple ADAT owner with BRC I did always have ADAT Lightpipe in constant use. Korg1212 and ADAT bridge and Ai3 and ADA80000 .... and a few synths
The only multiple unit I every got reliably working in a three way link up was the ....
Digi ADAT bridge (Protools)
Opcode Studio 64 XTC
Alesis BRC
Alesis XT
Alesis XT
couple of Digi 888/24
it took multiple lightpipe cables ... word clock Dig Super Clock and simple sync cable to BRC with the 9pin sync loop back through the ADATs
:shock:
In any system greater than 2 units in a digital link up that includes lightpipe ... LOOK OUT it's not that simple to just add word clock.
Generally I think interconnecting this stuff via analog yealds better long term results.
For the simple systems ...
Lightpipe
in and
out is the key.
Multiple slave units all indepenadntly chasing Lightpipe sync is the go and then use analog to inter connect.
shut up Kev
:shock:
nah ..... **** it :green:
One of the popular Lightpipe units has the TL074 chip at both the input and the output. This TL074 could have great bearing on both sound and ultimate signal to noise ratio. It might also be interesting to know what operating level the AD and DA chips run at and how companies chose to apply this to the outside world.
I think this is where Alesis made some choices and ended up at lower that what many of you would call pro. ... -14 or -13dB or there abouts.
The B boys did givbe 24dBu interfacing and this can be handy when doing straight analog transfers where there is no trim adjustment available.
side step
another relatively unknown converter from :
Digital Audio Denmark ADDA 2402 24-bit Audio Converter
they don't tell the whole story in their brochure but they do go a bit deeper that some
http://www.digitalaudio.dk/reviews/adda_2402/audiomedia.PDF
A/D conversion is 24-bit, and the resolution can be decreased to 20, 18 or 16 bits by adding psychoacoustic dither. This is done by implementing the algorithms and coefficients derived in Robert Wannamaker's Psychoacoustically Optimum Dither AES paper, which a friend of mine who designs converters read when it came out and described as a mathematical nightmare. This advanced dither feature is ‘free' with the CS5397 — fortunately there are talented individuals who are able to transform advanced psychoacoustic research into silicon, and manufacturers who are willing to implement it, as it adds a great deal to the 2402's capabilities.
Robert Wannamaker's Psychoacoustically Optimum Dither AES paper ...
No I haven't read it and had no idea it existed.
bottom line is
... now I have no idea whether to describe this unit as 24 bit, 20bit ,18 bit or 16 bit.
but the Crystal Semiconductor CS5397 does support 96k 24bit.
what other features are lurking inside these chips and do manufacturers make use if them ?
All of this and the original point to a DIY lightpipe unit may have been to get more inputs for say, drums into a 002 or similar.
there are many possibilities and I have more I could say
but I'll shut up now
enjoy
