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Steinar Bjaerum
2005-02-25, 09:15
At head-fi.org I came across this thread:
http://www4.head-fi.org/forums/showthread.php?t=106249

Any comments, Sean?

Steinar

________________________________________
From: discuss-bounces (AT) lists (DOT) slimdevices.com
[mailto:discuss-bounces (AT) lists (DOT) slimdevices.com] On Behalf Of Steinar Bjaerum
Sent: 25. februar 2005 16:34
To: discuss (AT) lists (DOT) slimdevices.com
Subject: [slim] Bit-correct digital out on Squeezebox?

Hi.

Has anyone verified that the digital out on Squeezebox (with fixed digital
output level) is bit-correct?
I am thinking about playing an uncompressed WAV, recording the signal at the
digital output and comparing the recording with the original WAV.

Is such a test part of Slimdevice’s test procedure?

If the output is bit-correct, the Squeezebox could serve as a high-end
“transport” when connected to an external DAC…
(Assuming the DAC is robust with respect to jitter.)

Steinar

kdf
2005-02-25, 10:34
Quoting Steinar Bjaerum <steinar.bjaerum (AT) online (DOT) no>:

> At head-fi.org I came across this thread:
> http://www4.head-fi.org/forums/showthread.php?t=106249
>
> Any comments, Sean?
>

he already left comments in the very thread you have linked here.
-kdf

seanadams
2005-02-25, 16:21
See my comments/suggestions in that thread. Jefemeister says it's
correct except for inverted amplitude. I haven't confirmed this yet -
AFAICT we have the DSP configured correctly, but if it is wrong, it's
easy to fix by tweaking the volume function.



On Feb 25, 2005, at 8:15 AM, Steinar Bjaerum wrote:

> At head-fi.org I came across this thread:
> http://www4.head-fi.org/forums/showthread.php?t=106249
>
> Any comments, Sean?
>
> Steinar
>
> ________________________________________
> From: discuss-bounces (AT) lists (DOT) slimdevices.com
> [mailto:discuss-bounces (AT) lists (DOT) slimdevices.com] On Behalf Of Steinar
> Bjaerum
> Sent: 25. februar 2005 16:34
> To: discuss (AT) lists (DOT) slimdevices.com
> Subject: [slim] Bit-correct digital out on Squeezebox?
>
> Hi.
>
> Has anyone verified that the digital out on Squeezebox (with fixed
> digital
> output level) is bit-correct?
> I am thinking about playing an uncompressed WAV, recording the signal
> at the
> digital output and comparing the recording with the original WAV.
>
> Is such a test part of Slimdevice’s test procedure?
>
> If the output is bit-correct, the Squeezebox could serve as a high-end
> “transport” when connected to an external DAC…
> (Assuming the DAC is robust with respect to jitter.)
>
> Steinar
>
>
>
>

Olav Sunde
2005-02-26, 08:53
Sean, does this indicate that it would be possible to do phase inversion
of the data stream from slimserver to SB and add this as an option from
the remote? That would be very cool..

regards
Olav
Sean Adams wrote:
>
> See my comments/suggestions in that thread. Jefemeister says it's
> correct except for inverted amplitude. I haven't confirmed this yet -
> AFAICT we have the DSP configured correctly, but if it is wrong, it's
> easy to fix by tweaking the volume function.
>
>
>
> On Feb 25, 2005, at 8:15 AM, Steinar Bjaerum wrote:
>
>> At head-fi.org I came across this thread:
>> http://www4.head-fi.org/forums/showthread.php?t=106249
>>
>> Any comments, Sean?
>>
>> Steinar
>>
>> ________________________________________
>> From: discuss-bounces (AT) lists (DOT) slimdevices.com
>> [mailto:discuss-bounces (AT) lists (DOT) slimdevices.com]
>> On Behalf Of Steinar Bjaerum
>> Sent: 25. februar 2005 16:34
>> To: discuss (AT) lists (DOT) slimdevices.com
>> Subject: [slim] Bit-correct digital out on Squeezebox?
>>
>> Hi.
>>
>> Has anyone verified that the digital out on Squeezebox (with fixed
>> digital
>> output level) is bit-correct?
>> I am thinking about playing an uncompressed WAV, recording the signal
>> at the
>> digital output and comparing the recording with the original WAV.
>>
>> Is such a test part of Slimdevice’s test procedure?
>>
>> If the output is bit-correct, the Squeezebox could serve as a high-end
>> “transport” when connected to an external DAC…
>> (Assuming the DAC is robust with respect to jitter.)
>>
>> Steinar
>>
>>
>>
>>

seanadams
2005-02-26, 11:35
Right - it's just the volume function in Squeezebox.pm that needs to be
tweaked.

On Feb 26, 2005, at 7:53 AM, Olav Sunde wrote:

> Sean, does this indicate that it would be possible to do phase
> inversion of the data stream from slimserver to SB and add this as an
> option from the remote? That would be very cool..
>
> regards
> Olav
> Sean Adams wrote:
>> See my comments/suggestions in that thread. Jefemeister says it's
>> correct except for inverted amplitude. I haven't confirmed this yet -
>> AFAICT we have the DSP configured correctly, but if it is wrong, it's
>> easy to fix by tweaking the volume function.
>> On Feb 25, 2005, at 8:15 AM, Steinar Bjaerum wrote:
>>> At head-fi.org I came across this thread:
>>> http://www4.head-fi.org/forums/showthread.php?t=106249
>>>
>>> Any comments, Sean?
>>>
>>> Steinar
>>>
>>> ________________________________________
>>> From: discuss-bounces (AT) lists (DOT) slimdevices.com
>>> [mailto:discuss-bounces (AT) lists (DOT) slimdevices.com] On Behalf Of Steinar
>>> Bjaerum
>>> Sent: 25. februar 2005 16:34
>>> To: discuss (AT) lists (DOT) slimdevices.com
>>> Subject: [slim] Bit-correct digital out on Squeezebox?
>>>
>>> Hi.
>>> Has anyone verified that the digital out on Squeezebox (with fixed
>>> digital
>>> output level) is bit-correct?
>>> I am thinking about playing an uncompressed WAV, recording the
>>> signal at the
>>> digital output and comparing the recording with the original WAV.
>>> Is such a test part of Slimdevice’s test procedure?
>>> If the output is bit-correct, the Squeezebox could serve as a
>>> high-end
>>> “transport” when connected to an external DAC…
>>> (Assuming the DAC is robust with respect to jitter.)
>>> Steinar
>>>
>>>
>>>