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Old 27th April 2014, 08:03 PM   #6021
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Quote:
Originally Posted by Edmond Stuart View Post
My pub (Hoppe, 020-NL) is still open.
So, what do you mean?

Cheers, E.
We haven't seem you for some time, I thought you holed up in Hoppe and now were thrown out.
My humour is sometimes a bit opaque, sorry...

Jan
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Old 27th April 2014, 09:07 PM   #6022
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Quote:
Originally Posted by jan.didden View Post
We haven't seem you for some time, I thought you holed up in Hoppe and now were thrown out.
My humour is sometimes a bit opaque, sorry...
Jan
Hi Jan,

The reason I'm 'pretty absent' is two fold:
1. The S/N ratio of this thread is rather high.
2. I'm still working on 'DiAna', as you might know, my PC based distortion analyzer. It's a hell of a job, as everything I have to invent by myself. For example, no literature is available on the web how to write the code for a (sort of) IQ detector that calculates the amplitude, phase, offset and frequency with the same accuracy as the machine precision (i.e. with a mantissa of 64 bits!). Moreover, writing 'audio software' is especially tricky as you have to deal with tons of unexpected events (and sound cards that misbehave!).
But, when this project has finished, I hope I've more time to build amps and contribute on a more regular base in this forum .

Cheers, E.
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Old 27th April 2014, 09:21 PM   #6023
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Well you certainly set yourself a worthy task!
Maybe, when it is finished, you should write about it!

Jan
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Old 27th April 2014, 09:31 PM   #6024
jcx is offline jcx  United States
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Quote:
i.e. with a mantissa of 64 bits
corrections for General Relativity effects?
Quote:
Here we report the detection of
relativistic time dilation due to velocities of several
meters per second and, separately, due to a
change in height of 0.33 m by comparing two
optical clocks based on 27Al+ ions.
Science Magazine: Sign In

they only needed ~55 bits

Last edited by jcx; 27th April 2014 at 09:37 PM.
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Old 27th April 2014, 09:35 PM   #6025
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Quote:
Originally Posted by jan.didden View Post
Well you certainly set yourself a worthy task!
Maybe, when it is finished, you should write about it!

Jan
Sure! In your 'Bookzine', of course.
BTW, maybe you could be of some help.
In the coming days I will send you a PM.

Cheers, E.
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Old 27th April 2014, 09:53 PM   #6026
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Surely you must be joking mr jcx.
Admittedly, striving for 64 bits precision looks rather 'anal'. However, when the distortion is zero (theoretically) I don't like answers like -180dB or so. Zero is zero, period. So I'm only satisfied when DiAna answers <-380dB (equally to the machine precision). Anything else is just an indication of lousy programming.

Cheers, E.

PM: Writing this kind of S/W is just as 'anal' as building a sub ppm amp.
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Last edited by Edmond Stuart; 27th April 2014 at 10:03 PM.
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Old 28th April 2014, 04:51 AM   #6027
RNMarsh is offline RNMarsh  United States
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Old 28th April 2014, 10:37 AM   #6028
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Originally Posted by MiiB View Post
Sorry Damir for various reasons I can't disclose the OPS. I am only one of the parties that has been developing the circuit.
Error correction is feedback .
If you have a REAL open loop outputstage with that kind of performance please show.
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Old 28th April 2014, 02:00 PM   #6029
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Quote:
Originally Posted by manso View Post
Error correction is feedback .
Of course. But, there, the local OPS feedback has only to take care of the OPS distortion, Not the more complex added ones of 3 stages. So can-we suppose it is more efficient ?
An other point is this local feedback is 100% (assuming the OPS is a x1 gain stage).
Well, i have no experience of this kind of error correction, sound side. But, for sure, it is a very interesting track to explore.
Mr Cordell could tell more about his experiences on this, and the way it sound ?
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Old 28th April 2014, 02:14 PM   #6030
MiiB is offline MiiB  Denmark
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The reason I designed the OPS feedback/error-correction was to make a tight loop around the OPS, reason is that I really don't see the purpose of using the input stage (and the gain of that) to correct errors occurring in the OPS. Now that my OPS relies on FB (like any other buffer) I have the option of tailoring the output impedance from slightly negative to more positive values. The error correction is based on a different approach than the HEC and Cordell Error Correction. it is simpler and more efficient.
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