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Author Topic: Alternative transports to USB/PC or 'Spinning a disc'?  (Read 7861 times)

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Anaxilus

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Re: Alternative transports to USB/PC or 'Spinning a disc'?
« Reply #50 on: August 14, 2015, 07:09:33 PM »
Quote from: drfindley on August 14, 2015, 07:06:37 PM
A proper checksum should easily be able to identify if you're looking at the same bits or not. If you're hearing differences, it's not in the bits but in the playback system. Even the above mentioned issues with memory or sending it through a processor might not be the perfect, but the bits themselves should be.

No kidding. Except if two different rippers produce identically checksummed files and they playback sounding different on the same player. Hurr de durr. Yippee!
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Anaxilus

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Re: Alternative transports to USB/PC or 'Spinning a disc'?
« Reply #51 on: August 14, 2015, 07:13:15 PM »
Quote from: schiit on August 14, 2015, 07:08:42 PM
What I'm saying is, if you're comparing a pressed CD (usually with good reflectivity, well-shaped pits, consistent track spacing) to a burned CD (with less reflectivity due to the nature of the media, unknown-shaped pits depending on laser, unknown track spacing depending on laser), then you're hearing the media and burner, because the lower-quality copy (which verifies fine on a computer) will cause the CD's tracking servo and error correction to go nuts. It will produce an output, but it may be audibly different due to the machinations of the servo and error correction--the first of which can cause jitter to go nuts, the second of which will interpolate missing stuff.

A much better comparison would be good disk to ripped file.

Yup, totally agree. Think of how many people go to shows with their burned CD and play back a familiar tune that doesn't quite sound as good as you remember. You point it out to them and they say, 'duh, it check summed perfectly.' No shit Sherlock.  facepalm
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"If you do not change direction, you may end up where you are heading." - Lao Tzu

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Xen

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Re: Alternative transports to USB/PC or 'Spinning a disc'?
« Reply #52 on: August 14, 2015, 07:15:20 PM »
Quote from: DaveBSC on August 14, 2015, 07:03:01 PM
USB, with output via a dedicated card, and going into a well designed asynchronous interface I think is quite good.
You could modify a raspberry pi to output an SPDIF signal. As long as the purpose is to read a music file and process it into a bitstream for a DAC, then you wouldn't need much more than a pi. Yeah, thinking of using ethernet is beyond my understanding. If the ethernet carries the same bitstream and the DAC can read from an ethernet port as input, then there is no real difference from SPDIF, I guess. Ethernet would just be another type of port and cable.
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DaveBSC

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Re: Alternative transports to USB/PC or 'Spinning a disc'?
« Reply #53 on: August 14, 2015, 07:16:48 PM »
This is why it's time for the CD to freaking die already. It's 1970s technology, like the LaserDisc. Time to go away. Just sell me your album in 24/48 or however you recorded it, as a FLAC file. I don't need some dumb antiquated piece of foil.
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audiofrk

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Re: Alternative transports to USB/PC or 'Spinning a disc'?
« Reply #54 on: August 14, 2015, 07:16:53 PM »
Quote from: schiit on August 14, 2015, 06:48:07 PM
Bingo. No need for us to do it.


You guys can order a custom board easier than us.  Intel cisc architecture is to wasteful and overkill.  Arm boards  are not optimized for audio and often use software dsp's .

Schiit pi- quad core mips cpu with I2s over bnc with direct DC and dual esata bays.
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Xen

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Re: Alternative transports to USB/PC or 'Spinning a disc'?
« Reply #55 on: August 14, 2015, 07:22:11 PM »
Quote from: DaveBSC on August 14, 2015, 07:16:48 PM
This is why it's time for the CD to freaking die already. ... Just sell me your album in 24/48 or however you recorded it, as a FLAC file.

 headbang Yes!  :)p4
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DaveBSC

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Re: Alternative transports to USB/PC or 'Spinning a disc'?
« Reply #56 on: August 14, 2015, 07:24:10 PM »
Quote from: Xen on August 14, 2015, 07:15:20 PM
You could modify a raspberry pi to output an SPDIF signal. As long as the purpose is to read a music file and process it into a bitstream for a DAC, then you wouldn't need much more than a pi. Yeah, thinking of using ethernet is beyond my understanding. If the ethernet carries the same bitstream and the DAC can read from an ethernet port as input, then there is no real difference from SPDIF, I guess. Ethernet would just be another type of port and cable.

You could. Depends on the quality of the S/Pdif output. DACs are not immune to transports with 1ns+ jitter on their outputs, as much as they might like to claim that they are. It also depends on the quality of the digital receiver. Some DACs seem to be putting a lot more emphasis on getting their USB inputs done right, and a lot less emphasis on using the best digital receivers for S/Pdif inputs. Not to mention the DACs like Ayre's that don't even have S/Pdif inputs.
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DaveBSC

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Re: Alternative transports to USB/PC or 'Spinning a disc'?
« Reply #57 on: August 14, 2015, 07:41:47 PM »
Quote from: audiofrk on August 14, 2015, 07:16:53 PM
You guys can order a custom board easier than us.  Intel cisc architecture is to wasteful and overkill.  Arm boards  are not optimized for audio and often use software dsp's .

Schiit pi- quad core mips cpu with I2s over bnc with direct DC and dual esata bays.

Meh. There's much more interesting stuff Schiit could do. A Yggdrasil class Phono pre. A Schiit version of Valvet's E1R single output transistor Class A monoblock. For half the money. I'd buy that Schiit.

The custom music server market is already well covered, from the entry level Auralitis, mid range Antipodes, and completely custom megabuck Aurenders.
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audiofrk

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Re: Alternative transports to USB/PC or 'Spinning a disc'?
« Reply #58 on: August 14, 2015, 07:57:36 PM »
Quote from: DaveBSC on August 14, 2015, 07:16:48 PM
This is why it's time for the CD to freaking die already. It's 1970s technology, like the LaserDisc. Time to go away. Just sell me your album in 24/48 or however you recorded it, as a FLAC file. I don't need some dumb antiquated piece of foil.
Quote from: Xen on August 14, 2015, 07:22:11 PM
headbang Yes!  :)p4


Fuck that, the only keeping company's from selling uprez mp3 masters is them selling uprez CD masters.  CDs suck but they're the lowest common denominator for good audio
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OJneg

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Re: Alternative transports to USB/PC or 'Spinning a disc'?
« Reply #59 on: August 14, 2015, 07:59:30 PM »
I like CD
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