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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: RE: The 4 ways to decode digital posted by J. Phelan on October 15, 2015 at 20:35:10:
Hi,> We will never sample in the giga-hertz - so why bother
> to talk about it ?I still remember when a 33MHz/32Bit 386 Intel Chip plus 16MB was State of the art (I used to smugly run 32-Bit Windows NT on this and pitty the fools stuck with 16-Bit windows).
Now my Smartphone has a quad core 2.3GHz Processor with 2GB of RAM and I am using 32-Bit / 48MHz RISC MCU's to control the functions in my DAC's (total overkill of course, but difficult to find anything slower, we clock it down normally in software to 4MHz, less EMI that way).
I also remember when 44.1 kHz / 16 Bit recordings where totally radical and many argued that 14-Bit & 32kHz was way good enough. Nowadays recording in 384 kHz / 32 Bit are no longer state of the art as 768k ADC's are shipping (if they are any good - different question).
> Most audiophile labels (like Hyperion and Harmonia Mundi) would
> never use mikes that are not flat. That means 25kKz. Period.I cannot for the life of me see any link between a microphone flat frequency response and a 25kHz rolloff.
In fact, the next truly flat microphone I see will be the first. Which is why good measurement microphones come with a calibration file.
> You are talking all theory here - no real-world action.
Well, lets talk real world. Back in the 80's and 90's when I did do a fair bit of recording I had mikes that rolled the HF off around 16kHz, but the rolloff well past 50kHz was quite slow and gradual. I also had the legendary NitePro 3D EQ (completely rebuild with different Op-Amp's BTW) in the mastering chain and I usually kept (by ear) boosting the 40khz "air band" massively.
When I looked at it and compared the microphone response I figured that in effect I was EQ'ing the Mike to be flat (likely to around 40kHz). The recording system then was 96/24 BTW, all multibit. The monitors had Focal tweeters which do not go much past 20kHz. Anyway, that was just a bit for fun.
Back to scheduled programming and the debate on how superior (or not) any approaches to DA conversion are that do not off the shelf chips (except they of course still use off the shelf chips).
Thor
At 20 bits, you are on the verge of dynamic range covering fly-farts-at-20-feet to intolerable pain. Really, what more could we need?
Edits: 10/15/15
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- RE: The 4 ways to decode digital - Thorsten 21:26:46 10/15/15 (0)
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