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Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
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Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
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In Reply to: Is Lavry DA10 genuinely an SRC or ASRC? posted by Patrick K on February 21, 2007 at 08:16:23:
I asked the question to the Lavry tach supoort some times
ago.
Anyway the DA-2002 is non sigma-delta which should
make the diff. Remember the sound of old multibits
players....Here is the answer.
Ciao.
********
Hello-The prices are:
DA-2002 $8,500.00
DA 10 $975.00
The DA-2002 and DA 10 both use synchronous up sampling at 44.1 kHz or 48 kHz.
This is different than the asynchronous sample rate conversion used in the DA
10’s “wide†lock mode or some of our competitor’s DA converters.The type of synchronous up and down sampling used in Lavry converters utilizes
much simpler and thus more accurate math to change the sample rate in even
multiples of the original. In the case of the DA-2002 or DA-10, the lower
sample rates are simply doubled to 88.2 or 96 kHz before conversion.The asynchronous sample rate conversion used in the wide mode of the DA 10
allows non-standard or variable sample rates to be converted. The advantage of
this approach is that the DA converter operates on a stable internal clock,
and is “disconnected “ from the input and any timing inaccuracies it contains
( as long as they are not so extreme that the input cannot “track†the
variations and losses “lockâ€). This has a lot to do with why other
manufacturers use this relatively simple solution to allow a wide range of
input sample rates and minimize conversion distortion caused by jitter.The DA-2002 and DA 10 also have a “CrystalLock†input circuit which is a more
“purist†approach to the problem of jitter in the digital data causing DA
converter distortion. By using an input memory buffer in conjunction with a
special “tunable†crystal circuit, the internal crystal of the DA converter
can “track†the frequency of the incoming signal and clock the data out of the
buffer at an extremely stable rate. This gives you the “best of both worldsâ€
because it allows the DA converter to clock from an internal crystal
oscillator that is very close to being as stable as a fixed crystal, while
allowing perfect bit-for-bit transmission of the input data to the DA converter.So in CrystalLock mode, Lavry DA’s are virtually immune to the effect of input
jitter on the accuracy of the conversion.Brad Johnson
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Follow Ups
- Re: Is Lavry DA10 genuinely an SRC or ASRC? - Vince S 08:49:32 02/27/07 (0)
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