Mike,
I tinkered with a patch which attempted to add fine grain adjustment to the squeezebox frequency, but didn't have the test gear to prove whether it was any good. [And the one person who tested suggested it didn't work, but the frequency missmatch you are recording is much larger than I expected!]
If you are interested in following this up give me a mail off list.
Adrian
----- Original Message ----- From: "Mike Reeve" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Thursday, March 03, 2005 4:21 PM
Subject: [slim] Digital Output
Hi
Regarding problems with lock on external DACS ...
About a year ago it was found that the Squeezebox digital output was somewhat off 44.10KHz BUT ... .. Sean quickly [as usual!] fixed this in the firmware.
Fortunately I have always routed Squeezeboxes via a device that buffers the input in a FIFO and then clocks it out using its own high-precision, lower jitter clock, so any such inacurracy has never been a problem for me.
However, out of curiousity I yesterday connected a Squeezebox to an Apogee Big Ben and it registers the Squeezebox at 44.13KHz :-O
[Another long-term issue has been the long settling time of the clock when switching into 'PCM mode' so I left the Squeezebox on repeat all night so that this was not an issue ...]
So, I'm wondering why the 44.13KHz: (a) Has the firmware changed?; (b) Is this 'manufacturing variance'? :-O; (c) ...
Clearly 44.13KHz is way out of the range of some 'high-end' DACs (e.g. AudioSynthesis DACs have a capture window of only +/- 100ppm - approx. 4Hz), so this could be the cause of some peoples' lock problems.
I know other people who read (or at least read) this list (such as Michel, Harry & Victor from the TacTHackers group) have both Squeezeboxes and Big Bens - what do you guys (or anyone else having the two) see as frequency these days ...?
Regards
Mike
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