Author Topic: Computer transport interface  (Read 21865 times)

Offline ozmillsy

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Re: Computer transport interface
« Reply #80 on: June 02, 2014, 06:03:09 PM »
SerialKiller?
It's all about the music,, not the equipment.

Offline kajak12

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Re: Computer transport interface
« Reply #81 on: June 02, 2014, 07:58:46 PM »
SerialKiller?
serial killer=  16 bit,24bit,32bit and dsd and 2xdsd
still discovering the link between electronics and audio reproduction.so much to learn and so little time

Offline ozmillsy

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Re: Computer transport interface
« Reply #82 on: June 02, 2014, 08:04:46 PM »
I'd be happy with pure dsd.

It's all about the music,, not the equipment.

Offline Tuyen

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Re: Computer transport interface
« Reply #83 on: June 03, 2014, 12:14:27 AM »
Running the USB module from it's own dedicated power supply should bring quite a dramatic improvement in SQ compared to being powered by the USB bus!  Keen to read what sort of power supply design you find sounds best powering the USB-I2S module.

Though in saying that,  one might first question your hearing, writing that a Delta Sigma based DAC sounds 'pretty good'?    I thought there was a common law on this forum that states that Delta Sigma based DACs wash the naturalness, timbre, heart and soul out of the music.    What then is the point of listening to the music at all, one may ask?  8)
« Last Edit: June 03, 2014, 12:17:52 AM by Tuyen »

Offline stevenvalve

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Re: Computer transport interface
« Reply #84 on: June 03, 2014, 12:37:04 AM »
?    I thought there was a common law on this forum that states that Delta Sigma based DACs wash the naturalness, timbre, heart and soul out of the music.    What then is the point of listening to the music at all, one may ask?  8)
I have found that all the newer chips i have heard do that. Burr brown chips could be good, anyone know.

Offline Tuyen

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Re: Computer transport interface
« Reply #85 on: June 03, 2014, 07:11:18 AM »
My experience too Steven.  I've found only when the BB chips were configured to run in NOS (non oversampling) mode, did it start to get some life back into the music!

Happy to be proven wrong!  :-[

Offline ozmillsy

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Re: Computer transport interface
« Reply #86 on: June 03, 2014, 08:44:05 AM »
Haha, you're such a tease Tuyen. :)

There are multibit fanbois zealots over on SNA, no doubt.

Most of the old timers here are more open minded, in my observation.     

The issue is, to extract the level of performance we expect out of any dac chip, involves significant effort (if not years of development).

The reality is, tda1541a stocks are dwindling.   The chips are not getting any cheaper.   We need another solution.

Here's a thought, maybe we should be pursue'ing a dac that has no chip?    :o
« Last Edit: June 03, 2014, 08:45:49 AM by ozmillsy »
It's all about the music,, not the equipment.

Offline gamve

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Re: Computer transport interface
« Reply #87 on: June 03, 2014, 11:41:32 AM »
Haha, you're such a tease Tuyen. :)

There are multibit fanbois zealots over on SNA, no doubt.

Most of the old timers here are more open minded, in my observation.     

The issue is, to extract the level of performance we expect out of any dac chip, involves significant effort (if not years of development).

The reality is, tda1541a stocks are dwindling.   The chips are not getting any cheaper.   We need another solution.

Here's a thought, maybe we should be pursue'ing a dac that has no chip?    :o

Or taken one step further
"Perhaps we should be giving up on digital audio altogether"  :o

Offline zenelectro

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Re: Computer transport interface
« Reply #88 on: June 03, 2014, 12:17:17 PM »
Or taken one step further
"Perhaps we should be giving up on digital audio altogether"  :o

Analog is for the weak who have no true resolve.  :D :D :D


Offline springcreek

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Re: Computer transport interface
« Reply #89 on: June 03, 2014, 12:27:30 PM »
Come and join me on the dark side (black disk), it's quite cosy over here  ;)

Offline Tuyen

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Re: Computer transport interface
« Reply #90 on: June 03, 2014, 03:16:40 PM »
dannydigital, may I please ask where you are sourcing the DSD files you are listening to from?   :-*

Offline gamve

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Re: Computer transport interface
« Reply #91 on: June 03, 2014, 03:34:38 PM »
Analog is for the weak who have no true resolve.  :D :D :D

Hey Zen,
I was going to comment but could not decide if you wanted a proper response or an interpolated response  :P

Offline Rob181

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Re: Computer transport interface
« Reply #92 on: June 03, 2014, 05:30:04 PM »
Come and join me on the dark side (black disk), it's quite cosy over here  ;)
I'm there...life is easy...great musical reproduction is somewhat more challenging...

Offline ozmillsy

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Re: Computer transport interface
« Reply #93 on: June 03, 2014, 06:56:45 PM »
dannydigital, may I please ask where you are sourcing the DSD files you are listening to from?   :-*

He gets them from here,,,,,

http://store.acousticsounds.com/c/372/DSD

 8)  :P
It's all about the music,, not the equipment.

Offline dannydigital

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Re: Computer transport interface
« Reply #94 on: June 05, 2014, 04:09:16 PM »
dannydigital, may I please ask where you are sourcing the DSD files you are listening to from?   :-*

Or here http://rutracker.org/ if you dare.  :-X

Offline dannydigital

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Re: Computer transport interface
« Reply #95 on: June 05, 2014, 05:03:52 PM »
That's it Danny. :)

I just bought one myself. Should be a good project.
Getting re familiarized with Design Spark.   

T

Hey Terry,

Have you got your board yet?  I'm wondering if you will be trying it with DSD.

I'm finding the board to sound quite nice, but there are some bugs I'm trying to iron-out. One thing I noticed is that it's got a nasty glitch/pop in the left channel the moment you press play or track next/previous, quite annoying!
Also, the "DSD flag" (P8) and "codec reset" (P7) resets during louder passages of DSD signal. This is not so good if you want to use those pins for system muting.
I read something interesting on the web site that Andrew posted earlier which could be related to this issue with peaking. See here, [http://store.acousticsounds.com/d/94956/Michael_Jackson-Thriller-DSD].  There is, "A NOTE ABOUT DSD AUDIO LEVEL".
I'm thinking that this could be a driver or firmware issue that would need to be worked on to process an extra +3dB DSD peak correctly?

I'll be interested in your experience, hoping mine is not a H/W fault. :-\

D

Offline zenelectro

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Re: Computer transport interface
« Reply #96 on: June 05, 2014, 07:05:17 PM »
Hey Terry,

Have you got your board yet?  I'm wondering if you will be trying it with DSD.

I'm finding the board to sound quite nice, but there are some bugs I'm trying to iron-out. One thing I noticed is that it's got a nasty glitch/pop in the left channel the moment you press play or track next/previous, quite annoying!
Also, the "DSD flag" (P8) and "codec reset" (P7) resets during louder passages of DSD signal. This is not so good if you want to use those pins for system muting.
I read something interesting on the web site that Andrew posted earlier which could be related to this issue with peaking. See here, [http://store.acousticsounds.com/d/94956/Michael_Jackson-Thriller-DSD].  There is, "A NOTE ABOUT DSD AUDIO LEVEL".
I'm thinking that this could be a driver or firmware issue that would need to be worked on to process an extra +3dB DSD peak correctly?

I'll be interested in your experience, hoping mine is not a H/W fault. :-\

D

Danny,

I should get mine in a week or so. There are numerous issues WRT pops etc with DSD but there are work arounds.
The other card is Amanero which I believe is superior but it has no galv isolation and there are various add on
isolation boards available = more time and stuffing around.

WRT DSD levels, if you are referring to the 'modulation index' it should be 50%, meaning at full signal the DSD filtered level should swing
half the 0 to rail level. So I'm guessing if you just low passed the DSD stream, and the logic swing was 0 to 4V, then the 0dBFS would swing
from +1V to +3V = 2V peak. However I have not tried this.

I'm thinking there will be some work arounds in our future.

Z
 

Offline stevenvalve

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Re: Computer transport interface
« Reply #97 on: June 24, 2014, 07:21:29 PM »
Danny arrived with Williams just finished and much modified Marantz 94 player. It has a reclocker fitted to the output driving the Clock, word, data. Interesting it sounded good, but the improvement when we changed it to run my battery to power the clock was dramatic, amazing really. You can hear a course grainy roughness when its connected via its internal power but with just the clock attached to a battery, WoW  Smooth sophisticated classy, For some people hard to believe, but true.   
« Last Edit: June 24, 2014, 07:50:38 PM by stevenvalve »

Offline stevenvalve

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Re: Computer transport interface
« Reply #98 on: June 24, 2014, 07:24:39 PM »
More pictures

Offline stevenvalve

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Re: Computer transport interface
« Reply #99 on: June 24, 2014, 07:30:08 PM »
Danny also brought along his computer transport Direct DSD Board fitted into his modified pioneer player. Its full on, I think danny can explain its workings.
« Last Edit: June 24, 2014, 07:52:28 PM by stevenvalve »