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Sound card for recording SPDIF optical ?
Xrcr9709
post Jan 20 2013, 13:51
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Hello,

Since it seems to me that SPDIF (optical) = numeric. I guess that any PC sound card with optical in will do exactly the same job ? Even the cheapest ones ? Or can some cards perfoms differently ? (Regarding quality etc.)


Thank you for information
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phofman
post Jan 20 2013, 23:17
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Yes but you have to make sure the card uses recovered clock from the incoming SPDIF stream as its master clock. It is no problem for the cards which specifically offer "external clock" switch. However, a simple USB card with SPDIF input like http://www.ebay.com/itm/External-USB-2-0-7...=item2320e5a362 which does not offer any external clock switch, only the input selector switch (the first control called "PCM Capture Source"):

CODE

pavel@eeepc:~$ amixer -c 1 contents
numid=14,iface=MIXER,name='PCM Capture Source'
; type=ENUMERATED,access=rw------,values=1,items=4
; Item #0 'Mic'
; Item #1 'Line'
; Item #2 'IEC958 In'
; Item #3 'Mixer'
: values=0
numid=12,iface=MIXER,name='PCM Capture Switch'
; type=BOOLEAN,access=rw------,values=1
: values=on
numid=13,iface=MIXER,name='PCM Capture Volume'
; type=INTEGER,access=rw---R--,values=2,min=0,max=6928,step=0
: values=5543,5543
| unk-4-0x00000000,0x00000452,
numid=3,iface=MIXER,name='Line Playback Switch'
; type=BOOLEAN,access=rw------,values=1
: values=off
numid=4,iface=MIXER,name='Line Playback Volume'
; type=INTEGER,access=rw---R--,values=2,min=0,max=8065,step=0
: values=6144,6144
| unk-4-0x00000000,0x000002ee,
numid=9,iface=MIXER,name='Line Capture Switch'
; type=BOOLEAN,access=rw------,values=1
: values=off
numid=10,iface=MIXER,name='Line Capture Volume'
; type=INTEGER,access=rw---R--,values=2,min=0,max=6928,step=0
: values=0,0
| unk-4-0x00000000,0x00000452,
numid=1,iface=MIXER,name='Mic Playback Switch'
; type=BOOLEAN,access=rw------,values=1
: values=off
numid=2,iface=MIXER,name='Mic Playback Volume'
; type=INTEGER,access=rw---R--,values=2,min=0,max=8065,step=0
: values=0,0
| unk-4-0x00000000,0x000002ee,
numid=7,iface=MIXER,name='Mic Capture Switch'
; type=BOOLEAN,access=rw------,values=1
: values=off
numid=8,iface=MIXER,name='Mic Capture Volume'
; type=INTEGER,access=rw---R--,values=2,min=0,max=6928,step=0
: values=0,0
| unk-4-0x00000000,0x00000452,
numid=11,iface=MIXER,name='IEC958 In Capture Switch'
; type=BOOLEAN,access=rw------,values=1
: values=on
numid=5,iface=MIXER,name='Speaker Playback Switch'
; type=BOOLEAN,access=rw------,values=1
: values=on
numid=6,iface=MIXER,name='Speaker Playback Volume'
; type=INTEGER,access=rw---R--,values=8,min=0,max=197,step=0
: values=158,158,158,158,158,158,158,158
| unk-4-0x00000000,0x00000000,


Will the CM106 chip http://www.steila.com/USB4IO/CMedia/CM106-...tasheet-1.3.pdf inside the soundcard switch its clock from its internal oscillator to the clock recovered by its internal SPDIF receiver when it is directed to switch input to the "IEC958 In" source? I don't know smile.gif

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phofman
post Jan 25 2013, 09:32
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I would be careful with integrated Intel HDA soundcards

http://mailman.alsa-project.org/pipermail/...ary/058928.html

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Arnold B. Kruege...
post Jan 25 2013, 13:22
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QUOTE (phofman @ Jan 25 2013, 03:32) *
I would be careful with integrated Intel HDA soundcards

http://mailman.alsa-project.org/pipermail/...ary/058928.html


It is not uncommon for consumer audio interfaces to resample digital inputs as a means for finessing the problem of synchronizing the core of the audio interface with its inputs. Not an audible problem for 2-channel audio streams if the resampling is done well, but it can be pretty fatal if the input stream is multichannel (e.g. Dolby Digital) or otherwise coded in a manner that the interface can't handle properly.
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phofman
post Jan 25 2013, 15:07
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QUOTE (Arnold B. Krueger @ Jan 25 2013, 14:22) *
It is not uncommon for consumer audio interfaces to resample digital inputs as a means for finessing the problem of synchronizing the core of the audio interface with its inputs. Not an audible problem for 2-channel audio streams if the resampling is done well, but it can be pretty fatal if the input stream is multichannel (e.g. Dolby Digital) or otherwise coded in a manner that the interface can't handle properly.


I understand it is common for AVRs etc... but I did not know about Intel HDA implementations being so broken (the resampling WM codec is basically an exception).
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