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In the Forum: Didital Things
In the Thread: The Museatex Bidat pages.
Post Subject: Bidat and bits.Posted by Romy the Cat on: 2/9/2011
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 miab wrote:
Romy,
 You have mentioned somewhere in the Bidat-Lavry thread about the Bidat being a 20 bit dac but throws out 4 bits (quote below). But, you have also stated that you play 20/44.1 files from your pc set-up into the Bidat and more specifically to compare the Lavry and Bidat. I am now into recording files at higher rates and bit depth but will keep second copies to play through the Bidat. I'm specifically taking 24/96 and resampling to 20/48 which the Bidat plays fine. Can I ask where or how you came upon this info about the Bidat tossing the 4 bits internally?
"Among the disadvantages I would name /

2) 20 Bit and 44 kHz maximum. It reads 20 bit but it toss the 4 bit internally and in reality it posses 16Bit."


Miab, first of all it was not “posses” but “process”, I need to add it to the list of my epistolary treasures. Bidat uses 16Bit chips inside, so it is not the question what it process (it will not process more than 16 bit) but what it will be able to lock. Bidat use TDA1547 that is 20 bit chip but from what I recall the conversations with people who know how Bidat works they expanded to me that it has only 16 bit useful. Then I was informed that many 16 DAC in past in reality were 12-14 bit DACs…. The stream acquisition part of DAC is a different thing – it is about what kind stream DAC can read, not process but to read, or to lock. Bidat lock 18 and 20 bit just fine. I never tried 48kHz feed and I am VERY surprised that you report that Bidat read it. To the best of my knowledge Bidat has no 48K clock, how the hell it read it? Well, it might have VERY wide window bandwidth for locking and it might lock your 48K stream with 44K clock but you will have music played slower then it intend to be. Try to play 88K with 44K clock - you will see the effect.

Rgs, the Cat

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