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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: Same here posted by sbrians on June 9, 2015 at 12:44:08:
"When doctors are trying to diagnose whether you have gas or cancer from MRI results, or when the military is trying to ensure a missile hits an ammo dump and not a nunnery next door, they don't use "24 bit" or "32 bit" delta-sigma D/A converters. Instead, they rely on precision, multibit ladder DACs, like the Analog Devices AD5791. This allows them the bit-perfect precision they need for critical applications, rather than the guesswork of a delta-sigma."
Let me play devil's advocate. The other side of the coin of precision is interpolation. Precision R2R ladder chips may be used for guided munitions, but interpolation is used in spy satellites.
I've read that the camera in a spy satellite orbiting the earth doesn't have the resolution needed to read the numbers on a car's license plate. It can resolve the car, and even the plate, but not the numbers on the plate. They use fractal mathematical equations to interpolate what the numbers on the plate should be, and it works. Remarkably the level of resolution is infinite. The amount of fine resolution may be meaningless, but there is no end to it.
I mention this because I think the DSEE software on the Sony HAP-Z1 is on the verge of doing something like that. They state that DSEE was designed to fill in lost low level detail on recordings that have been quantitatively compressed. Something about "fade." I really wanted to give DSEE it's own thread.
They say you can only run fractal equations on super-computers. Desktops keep doubling in computational power every so many years. I wonder if one day we will have desktop computers with enough computational power to run fractal music playing software that can fill in low level detail that the original medium was not able to capture, or maybe it will be used to repair old tapes that have been damaged by age. I wouldn't be surprised.
If fractals interest you then I recommend, "Arthur C. Clarke Presents the Colors of Infinity." Linked below. It really deserves to be seen on the big screen, and if you are so inclined, with a good buzz. The soundtrack is by David Gilmour of Pink Floyd. It even delves into Jungian psychology and shared consciousness.
I've come to the opinion that ladder dacs and PCM were two technologies that were made for each other, and DSD and one bit sigma delta dacs are two technologies that are made for each other.
I would very much like to try a 20 bit ladder dac one day. Maybe in a year or two.
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Big speakers and little amps blew my mind!
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Follow Ups
- RE: Same here - Mr_Steady 17:22:20 06/19/15 (0)
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