So was there a final resolution on this topic?
Was anything changed in a specific firmware or Slimserver release?
George
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dean Wrote:
On Nov 14, 2005, at 1:34 PM, Patrick Dixon wrote:
Given that the Squeezebox has a 24 bit output, the rounding error
should be down at around at 138-144dB, not 90-96dB and I have a
hard
time believing that the effect would be as obvious as you state at
that level.
OK, here's an expanded version of the simple illustrations I posted on
the bug report.
I have used 2 simple systems - each consists of an ADC the output of
which is lsb extended to 5-bits, a digital mutiplier, DAC and finally
an analogue gain to compensate for the digital multiplier. In all
sbjaerum Wrote:
+ return int($floatmult * (1 8) + 0.5) * (1 8);
I'm not sure if performance matters here, but one thing to consider is
that multiplying an integer by (1 8) is the same as shifting that
int left 8 bits (and it may be more efficient, depending on
I have filed this as bug 2557
http://bugs.slimdevices.com/show_bug.cgi?id=2557
As things stand, the patch above (which I have tested and works well)
is not considered important enough to make it into 6.2.1 So if you
think different, you'd better vote for it and/or add you comments fast!
--
6.2.1 is likely to go out today, sorry it didn't make it.
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Patrick Dixon Wrote:
It's worth holding for this!
Is the patch in any nightlies yet? if so, which version and which
firmware version? I agree that if it affects audio quality, it's
important. To be clear, I assume that at 100% volume the problem does
nto exist...correct?
-Joe
--
skyrush
Given that the Squeezebox has a 24 bit output, the rounding error
should be down at around at 138-144dB, not 90-96dB and I have a hard
time believing that the effect would be as obvious as you state at
that level.This is simply incorrect - the rounding error is at the 16th bit
of a
16-bit
On Nov 14, 2005, at 1:34 PM, Patrick Dixon wrote:
Given that the Squeezebox has a 24 bit output, the rounding error
should be down at around at 138-144dB, not 90-96dB and I have a hard
time believing that the effect would be as obvious as you state at
that level.
This is simply incorrect
It's not clear that there is an issue at all. We'd need a
reproducible case.There is definitely an issue, and it's easy to
demonstrate/reproduce -
the only question is whether you can hear it or not! I say I can, and
jhwilliams has done blind testing which indicates that he and his
sbjaerum Wrote:
I don't know how the multiplication with gain is done in the firmware,
but wouldn't the small server patch below do what Patrick suggests?
Steinar
Index: server/Slim/Player/Squeezebox2.pm
===
---
jhwilliams Wrote:
Let me know regarding the perl you are looking at - however, I'm running
6.2 w/ firmware 15 so it seems more likely to be a firmware side issue
(afaik?).
Jon
The perl patch works together with firmware versions with the new
volume functionality. I don't remember at which
sbjaerum Wrote:
OK, agree. Any listening tests yet?
Steinar
I've had a short listen and I think it's good. I'd like to take some
time to be sure.
--
Patrick Dixon
www.at-view.co.uk
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On Oct 30, 2005, at 1:39 AM, Patrick Dixon wrote:
It's not clear that there is an issue at all. We'd need a
reproducible case.
There is definitely an issue, and it's easy to demonstrate/reproduce -
the only question is whether you can hear it or not! I say I can, and
jhwilliams has done
Patrick Dixon Wrote:
My point is exactly as Steinar says.I think this is one occasion where
we can have our cake and eat it ;-)
Agreed, this makes sense.
If someone has the time it would be REALLY helpful to get verification
that the new multiplier is correct. Make an AIFF that loops through
On Sun, 2005-10-30 at 11:27 -0800, seanadams wrote:
Patrick Dixon Wrote:
My point is exactly as Steinar says.I think this is one occasion where
we can have our cake and eat it ;-)
If someone has the time it would be REALLY helpful to get verification
that the new multiplier is correct.
seanadams Wrote:
If someone has the time it would be REALLY helpful to get verification
that the new multiplier is correct. Make an AIFF that loops through a
few hundred handom numbers, then play it on the old firmware and then
on the new firmware with this patch. Record the s/pdif output
This is a very serious issue for some owners that put the Squeezebox in
service as the primary source. Is there a bugzilla for this?
Regards
--
Music Machine
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Patrick Dixon Wrote:
So Sean, I have a suggestion. The log volume control is clearly a
better approach overall, but could you implement a version that uses
1/256 rounded multipliers for (say) volumes 20-40, and non-rounded
multipliers below? No critical listening can really take place
If this is gonna take a while to implement, any chance of posting the
latest pre-log nightly/beta for us to revert back to, for comparison?
Frankly, I too, have suspected something ain't right lately, but
haven't had time to investigate.
--
sleepysurf
squeezebox2 (with elpac wm075-1950-760
sleepysurf Wrote:
If this is gonna take a while to implement, any chance of posting the
latest pre-log nightly/beta for us to revert back to, for comparison?
Frankly, I too, have suspected something ain't right lately, but
haven't had time to investigate.
Unfortunately I'm at work so I
Can you give us some more info on your setup? You say SB2 direct to
amp, but you then talk about a preamp volume setting. What actual
volume numbers are you using in each case?
I've found that with an SB2 directly into an amp, whereas I used to
listen at around 20-25 on the SB2 volume setting,
seanadams Wrote:
We'd have to identify something specific, otherwise it isn't anything I
can look into. The most helpful thing by far would be if you could
capture a recording from the digital outputs using a good s/pdif sound
card, just so we can make sure the data is getting through the
Patrick Dixon Wrote:
Can you give us some more info on your setup? You say SB2 direct to
amp, but you then talk about a preamp volume setting. What actual
volume numbers are you using in each case?
I've found that with an SB2 directly into an amp, whereas I used to
listen at around
jhwilliams Wrote:
I've tried all the various player audio settings (different gain
settings, etc). But the result is consistently the same - flatter sound
at lower volumes.
The volume curve has changed.
--
seanadams
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seanadams Wrote:
The volume curve has changed.
Is that to make it more linear?
I still find that with preamp at zero, max volume isn't as loud as it
used to be (I realise this is the opposite issue to everyone else in
here).
Any ideas/suggestions regarding the flatness of the sound? I have
jhwilliams Wrote:
Is that to make it more linear?
I still find that with preamp at zero, max volume isn't as loud as it
used to be (I realise this is the opposite issue to everyone else in
here).
Perhaps replaygain is in effect?
Any ideas/suggestions regarding the flatness of the
seanadams Wrote:
Perhaps replaygain is in effect?
I've disabled replaygain - i haven't bothered to run any tests (my
equipment is packed), but i'd guess i can't get around half the range.
seanadams Wrote:
Can you be more specific?
Unfortunately I can only be subjective - the sound with
jhwilliams Wrote:
Unfortunately I can only be subjective - the sound with the new version
seems to roll off. I'm not that great with audiophile terminology, but i
find the soundstage with v15 seems much better - especially with
classical music.
We'd have to identify something specific,
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