jclyle;209815 Wrote:
> Will the SB3 pass on a 24/96 signal to an external DAC? Or is it passed
> on as 24/48?
I think this is a good question, and I think the answer is that the
same bit stream goes out to an external DAC that is passed onto the
internal DAC - 48KHz/24bit.
I assume the decimation is being done in a cpu/Xilinx chip, and there
does not exist the possibility of having a separate output that is not
decimated for an external DAC?
I assume the onboard Xilinx chip does not have the space or speed to
implement a 300 tap 24 KHz FIR filter? Probably not.
So, the only solution would be to implement this filter somehow into
Slimserver. I suppose we could implement such a thing and insert it
into the flac decoding instruction in convert.conf?
Something like:
flc flc transcode *
[flac] -dcs --skip=$START$ --until=$END$ -- $FILE$ |
lowPassFilterGoesHere | [flac] -cs --totally-silent
--compression-level-0 -
and then we let the SB3 go ahead and decimate as usual, and the noise
floor will not increase due to aliased information above 24 KHz.
What say?
-Ron
--
Ron F.
*Squeezebox setup:* wireless SB3 -> CI Audio VDA.2 DAC + VAC.1 PSU
*Main rig:* NAD 7600 + NAD 2600A -> Phase Tech PC-6.5 speakers
*Headphone rig:* Headroom Max -> Sennheiser 650s
*Music Server:* Nano-ITX computer running SlimCD + 750 GByte HDD ->
Netgear wireless router
*Other stuff:* NAD C542 CDP, NAD 6300 Tape, Monster 5100 Power
conditioner, Outlaw Audio cables
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