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Budget Standalone "Toslink > DSP > Toslink" with Camilladsp. Set up instructions for newbies.
- Thread starter MCH
- Start date
yes, and it accepts coaxial which is fine. And I guess I can hook it up via i2s to raspberry (although I have to dump my transport hat as there is only one i2s line and use something like usb to tosslink)
As a cheaper alternative DIR9001 + SRC4192I might work but I'm not a DIY expert.
Or even this thing which looks like it does everything all in one
The latter looks more appealing though
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48k and I assume 16bit.
Need 96k/24bit
- Thread Starter
- #165
this can be a better deal than the 1eur hdmi extractor. Will try to get one, thanks!48/16 still perfectly fits TV usage
- Thread Starter
- #167
not that i know of, i believe camilladsp will still use a higher bit depth for processing -i might be wrong though-. I said perfect for TV usage because TVs typically send 48kHz/16 bit via toslink
Cdsp appears to process at float64 internally indeed.
Regarding sample rate, I just found this post from Michael about 48 vs 96 kHz, probably inaudible, I mean I just trust the guy
and the slight extra warping at high freqs means my own ears will be the limiting factor anyway.mdsimon2
Major Contributor
Biggest issue to me is 16 bit output will have a lot of residual noise unless you have an analog volume control. Assuming you are using a DAC with 2 V output, residual noise at the DAC output will be 30 uV, which will then be multiplied by amplifier gain.
A big advantage of 24 or 32 bit output to the DAC is that at lower levels digital volume control will attenuate the noise from your source and push it below the noise floor of your DAC + amplifier.
For example, take a 16 bit source and 32 bit output to the DAC. If you have a DAC with 112 dB dynamic range at 2 V output, coupled with an amplifier that has 100 dB dynamic range at 5 W in to 4 ohm and 25.6 dB gain, at -20 dB digital volume control position residual noise at the speaker terminals is 121 uV which is pretty good.
If you only have 16 bit output to DAC with the same system residual noise at the speaker terminals will be 591 uV at digital all volume control levels. In this system a lower noise DAC or amplifier would gain you almost nothing.
Michael
A big advantage of 24 or 32 bit output to the DAC is that at lower levels digital volume control will attenuate the noise from your source and push it below the noise floor of your DAC + amplifier.
For example, take a 16 bit source and 32 bit output to the DAC. If you have a DAC with 112 dB dynamic range at 2 V output, coupled with an amplifier that has 100 dB dynamic range at 5 W in to 4 ohm and 25.6 dB gain, at -20 dB digital volume control position residual noise at the speaker terminals is 121 uV which is pretty good.
If you only have 16 bit output to DAC with the same system residual noise at the speaker terminals will be 591 uV at digital all volume control levels. In this system a lower noise DAC or amplifier would gain you almost nothing.
Michael
Thank you very much for the detailed explanation Michael, that makes a lot of sense. As I do not have an analog volume control in my current setup, it is very relevant to me.
I have been looking for cheap-ish or second hand sound card that would do spdif output (for speakers through decent dac) + analog output (for subwoofer), in the 24/32 bit realm but I have not found much.
Only contendant so far is Sound Blaster Extigy at £32 used on ebay, lots of I/O and seems to work well in linux. Anyone tried that?
As an alternative I suppose I could use two of these usb -> spdif and a spare cheap dac for the sub.
I am assuming the spdif from both units will be clock synced?
I am assuming the spdif from both units will be clock synced?
melomane13
Active Member
i use terratec aureon 7.1 usb . 16bit 48khz (Cmedia CM6206) . Spdif in and out, 8 channels , buffer for headphones.
with my setup , digital volume with camillaDSP , JBL studio 590 ( 92 db / W) and aiyama A07 amp i can hear very little noise at 10 cm from horn.
if i use another soundcard i have ( TerraTec Aureon XFire HD 8.0 USB, 24 bit with 105 snr) this is dead silent.
But i dont hear at 10cm...
so using best soundcard change nothing in real use. 16/44.1(48) is all that is needed.
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Thanks for the feedback, much appreciated.
I hear you and that was my feeling as well based on other people IRL experience.
However, we are constantly chasing low noise kits across the chain with good dacs and amps so I also feel that it would be a shame to 'waste' it because I was a bit cheap.
It seems that I could get away with it by investing a tiny bit more on either a higher bit depth processing sound card or 2x usb-spdif converters and recycling a spare dac.
Funnily enough I have one plugged into my laptop right now. Linux identifies it as ICUSBAUDIO7D
Only just got this to play with and haven't spent much time with it. So far have tried patching (with qpwgraph) SPDIF input to speaker out, trying to record with Audacity & arecord from the command line.
Optical SPDIF input works just fine when fed from a Chromecast Audio (
However, SPDIF does not work when fed from a Sony TV (which insists on 48Khz - I have it set to PCM always and this works fine with an SMSL DAC).
Allegedly this USB audio interface does support 48Khz though, so if anyone has any clues as to how to get that to work would love to hear.
I see above someone recommending forcing Camilla to 48Khz but haven't even got that far - if I can't get anything else to record from the TV don't see the point. Or does Camilla do something funky with hardware settings that magically make 48Khz input work - and if so, what?
EDIT: My bad - the Chromecast Audio is 48Khz too! Got DAC inputs mixed up - the only 44.1Khz one it has is from an MPD server via USB.
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HenrikEnquist
Active Member
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No magic unfortunately. So if for example the arecord tool isn't able to record at 48 kHz, then CamillaDSP won't be able to either. What happens when you try with arecord? Do you have anything other than the TV that can output 48 kHz on SPDIF? Could be worth testing with another device, just to check if there is something strange with the SPDIF signal from the TV that the USB adapter doesn't like.
It runs, but output is just silence.
FWIW, I have just been playing around with EasyEffects. Again, Chromecast input works fine, TV does not.
What is interesting with that, is that EasyEffects is a pipewire thing, and pipewire allegedly runs at 48Khz. In fact, I can cat /proc/asound/ICUSBAUDIO7D/pcm0c/sub0/hw_params while it's running which yields:
access: MMAP_INTERLEAVED
format: S16_LE
subformat: STD
channels: 2
rate: 48000 (48000/1)
period_size: 512
buffer_size: 32768
Ie. the hardware says it is actually sampling at 48Khz, for both Chromecast & TV, but only the Chromecast (which is actually
Edit: So after looking again at the sample rates my DAC (SMSL DO100) says each source is, both Chromecast Audio & TV are 48Khz. I checked the SPDIF cables and the one from TV is good so that can't be the issue. So if it's not sample rate, what is the problem? How come my DAC has no issue with the TV's optical SPDIF but this USB adapter does?
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Are both Chromecast and TV signals encoded in 16 bits?
I have no idea. The DO100 DAC supports up to 24 bit but sadly the display only shows the sample rate.
I discovered the Android TV box our ISP supplied also has an optical SPDIF output, so tested that. Works just fine. From this I would assume that it's nothing to do with Android O/S and some funky business Sony have added on top?
FWIW, the model is a KD-55XE9005
Connecting to the TV using adb and running dumpsys gives a whole load of stuff I mostly don't understand so went searching for clues... can't find any notable references to sample rates other than 48Khz/16 bit.
48kHz/16bit is standard Android TV indeed so must be something else...
I tried a different optical cable with no success.
I also have a bi-directional coax<->optical converter which is normally in use to convert optical from TV into coax for the DAC (as the DAC's optical input is taken)... connecting TV(optical)->converter(optical)->ICUSBAUDIO7D(optical) unsurprisingly doesn't work either.
There must be some kind of subtle format incompatibility with the TV output but I can't find any concrete details on Sony TV SPDIF specs so really don't know.
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