From: Chuck Harris <[EMAIL PROTECTED]>
Subject: Re: [time-nuts] Re: Accuracy of a sound card
Date: Tue, 23 Aug 2005 15:43:54 -0400
Message-ID: <[EMAIL PROTECTED]>
> Hi Poul,
Hi Chuck,
> I am quite aware that making a soundcard more accurate is gilding the
> lilly.
>
> But if you return to the m
Hi Poul,
I am quite aware that making a soundcard more accurate is gilding the
lilly.
But if you return to the middle of this thread, where I offered powerline
noise up as a reasonably accurate, ubiquitious timing reference, and had
my suggestion refuted by a gentleman with a soundcard based spe
From: Alberto di Bene <[EMAIL PROTECTED]>
Subject: [time-nuts] Re: Accuracy of a sound card
Date: Tue, 23 Aug 2005 19:35:58 +0200
Message-ID: <[EMAIL PROTECTED]>
Alberto,
> Just for the sake of curiosity and to end this topic, I measured the
> accuracy of another sound card I have in my PC, a Ter
In message <[EMAIL PROTECTED]>, Chuck Harris writes:
>No one has yet addressed the actual oscillator that is on board the sound card.
>What are they using on the Delta 44? ... the Aureon Sky? I would have much
>more confidence if they would at least use a cheap TCXO module.
Using a tcxo for a s
Hi Alberto,
My point in starting this whole controversy was that there are no adjustments
on the sound cards, and the oscillators are just garden variety in quality.
Typically,
they are simply a miniature crystal that runs an oscillator on an ASIC. The
accuracy your
card gets is luck-of-the-d
Just for the sake of curiosity and to end this topic, I measured the
accuracy of another sound card I have in my PC, a Terratec Aureon Sky. A
good card, but not of the same class of the Delta 44. But it was more
accurate... 40001.5 Hz which translates into an error of 37.5 +- 2.5 ppm
73 Alberto
Alberto,
> I don't know the reason, but my suspect is that there is just
> one ADC, multiplexed between the left and the right channels,
> hence the time skew between them.
There may be some cards out there, that do it that way. But if you look
at the specs of the better adcs used on sound card
Ulrich Bangert wrote:
>Because it is a differential measurement between the two channels (which
>are sampled exactly the same time due to the adc hardware) the first
>idea was, that the effects introduced by the not so good sample clock of
>a ordinary sound card may cancel out completely.
>
>
B
I would welcome a means of providing an external clock signal to the Delta-44,
if you are able to find out how to do this.
I have my spam filter intentionally set to put all messages with HTML in the
spam trash. I do not mind attachments when they are relevant and executables do
not bother me beca
Tom,
it isn't exactly the time to talk about, because not everything is
working as expected, but since you started with sound card accuracy:
Since a few months i am working on a project that uses a sound card as a
phase comparator behind a dual mixer for ultra stable oscillator
stability measureme
>>The list is set to convert HTML to plain text. That's what Mailman
>>defaults to on setup, but I pretty strongly agree with that approach, so
>>left it as is.
>>
>>
>
>Yes please, no HTML if we can avoid it.
>
>
HTML is of course a vehicle of infections and the use of net resources
is n
In message <[EMAIL PROTECTED]>, John Ackermann N8UR writes:
>The list is set to convert HTML to plain text. That's what Mailman
>defaults to on setup, but I pretty strongly agree with that approach, so
>left it as is.
Yes please, no HTML if we can avoid it.
--
Poul-Henning Kamp | UNIX
Alberto di Bene wrote:
Alberto di Bene wrote:
P.S. Let me please test how this reflector behaves when sending HTML
messages... I have noticed a strange behavior in the past... it
insists on reformatting
the HTML message at its will...
Here following there should be an image... let's see i
Alberto di Bene wrote:
> P.S. Let me please test how this reflector behaves when sending HTML
> messages... I have noticed a strange behavior in the past... it
> insists on reformatting
> the HTML message at its will...
> Here following there should be an image... let's see if it shows u
I have measured the accuracy of the time base of my M-Audio Delta 44
sound card with the tolerance (and the accuracy) of 2.5 ppm
I modified my program TCube for a sampling rate of 96 kHz, and set it
for 40 kHz output.
I connected the output to my 5328B (whose time base is driven by
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