I2S clock

l0v3r

Is possible to change the I2S clock input of Audigy2 from 96Khz to 48KHz with kX Drivers? If yes, where exactly is the option?

10x guys

see ja!

Samir

This is EXACTLY the question i wanted to ask!

Question for Eugene:

From what exact register(s) you get these values in SPDIF/I2S Status window:

I2S Inputs: (0): 96000Hz [R] (1): 96000Hz [R] (2): 96000Hz [R] ? ? ?

Any way to acces these register(s) from console?!?

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Samir

Anything on this?!?

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Eugene Gavrilov

the 76 register might help you, but in most cases this causes serious issues with the p16v core... i2s inputs should be locked at 96kHz

76 register: just open the console and try to switch spdif sample rate -- you will notice 76 register changes. values for i2s are the same

440
880
cc0
etc.

E.

Samir

Thanks!

to Eugene:

I knew about register 76, it can set p16v PB, I2S Out and SPDIF Out freq...
btw, What is p16v PB?!?

WHY i2s inputs should be ALWAYS locked at 96kHz? Is this hardware limitation?
From what register, if any, you actually read I2S Input values?

So many questions...
(С Новым годом! )


to l0v3r:

Maybe you should try executing sptr 76 0 8880 or sptr 76 0 1110 comands in Kx console & check how Live! Drive input works after these...

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Samir

Just before wanted to go to sleep i tried this command:

sptr 76 0 80008880

Whoops! It changed all I2S Inputs to 48000Hz (!) status
when removing highest bit from register 76 (sptr 76 0 400) I2S Inputs fade back to 96000Hz [R] in few seconds...

Eugene, what are these (!) and [R] stuff mean?


l0v3r:

Please try sptr 76 0 80000400, your Live!DriveIR might work fine with this...

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dj_stick

R-Rate Locked; S-Stream Locked; V-Valid Audio

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l0v3r

10x a lot guys , I'll try these commands this weekend, waiting for the ICs to modify the Drive.

see ja!

l0v3r

OK, I've done some tests right now and changing the 8th bit to 1, the info says that the I2S is set to 48KHz but the inputs mutes completely.
I forgot a thing about the UDA1360, it works at maximum at 20bits... I'll continue to do tests the next week after changing them with the UDA1361.

さようなら。

Samir

Hmmm, doesn't work!?! Too bad! Also try, sptr 76 0 80008880 maybe it might work... Tried 8880 & 1110 values ???

がんばって。　

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l0v3r

Ummm, I'll try also these settings... the next week ...
わたし　を　がんばります。 (I hope it's well written )

thank you for now.

Eugene Gavrilov

happy hacking
actually, I cannot disclosure this information, since it is not available for the public. but you can figure this out yourself, I'm sure.

note that xxx0 is much close to what you need, while 80000000 will cause some unexpected behaviour.

PB is 'playback'

the 76 register's 'p16v PB' value is updated automatically whenever you start/stop playback via 'Wave HQ' device

E.

Samir

ありがとうございました！　
спасибо!

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l0v3r

OK

http://www.hardwareheaven.com/showthre...968#post535968

bye

AntonLive

Hello, my first post on this forum. Could anyone give me a tip: where could i get information (with diagram would be lovely) how to connect two Soundblaster cards via I2S bus? I know the pinouts and hold a printout of Philips datasheet, but just cannot figure out whisch cable to rout.

thank you,
A

TravelRec.

It is not easily possible to interconnect 2 Soundcards via I2S, since these inputs/outputs must be clocked synchronous to each cards master clock or both cards must be synchronized by one crystal to get the same master clock. Or finally a sample rate converter must be inserted between the cards (I2S <-> SRC <-> I2S). So it is much easier to use the different SPDIF pins for interconnection. SPDIF out of one card can be directly connected with SPDIF in of the other card and vice versa.

And, the most important thing: All I2S-Pins on Live! and Audigy-Cards are inputs, so you can´t get an output signal from these cards via I2S.

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AntonLive

Thank you for reply. I started researching I2S mainly due to lack of Coax SPDIF inputs. I have 2 cards: SB Live! Gold and second one is Audigy ZS2. Audigy ZS behaves nicer in KX DSP and i can record ASIO. On another hand Live has more SPDIF inputs. i thought to use Audigy as my recording card, but maximum what i got was 2 digital recording pairs (4 channels). I2S seemed promising...

PS. I did not realize that I2S were only outputs. I am not so advanced with electronics, and readidng quickly Philips tech note, i thought through 3 pins it can send and receive. Now all is clear. Thank you very much for the help.

AntonLive

I also wanted to write about this:
Soundblaster SPDIF uses different Logic Voltage (TTL), so without converting the signal, it does not receive other equipment's signal. First i was experimenting and got confused. Somewhere on internet i found this: Converting your Soundblaster
The schematic seems like its doable for people without PCB etching equipment. (if someone wants to connect standard SPDIF to Sondblaster AUD_EX pins)

I tryed the other way:

I was testing the Soundblaster non standard TTL connection. Between two SB cards. And i noticed strange thing: when i connect from one computer's soundblaster SPDIF to the other SB on another PC (via coaxial cable), in case the plug is correctly connected no sound comes out of output, only crackles. Then if i pull the plug half way out, perfect Digital audio streams between the machines. I thought maybe the polarity is wapped on the cable, but all is fine. Do you guys know what can be the cause?

Russ

You did not mention which SB cards you are using, which jacks you are using on the cards, nor what OS or kX version you are using (and more info about the cable you are using could be helpful). I guess you are using (for output) the (4 pole) orange digital out jack found on many models? These jacks have 3 separate SPDIF connections, and use a proprietary cable (to make use of all 3). I suppose it is possible that your signal is going to one of the other SPDIF outputs (i.e. it is not going to digital front)? and if you are using (for example) a 2 pole cable, then when you pull it half way out, it could pick up the signal from one of the other SPDIF outputs (see pinout). Trace your signals in the DSP and use a peak plugin to confirm that your signal is being sent to digital front on epilog.

AntonLive

Sorry, i wrote it down rather hastily... I Use 2 Soundblasters: CT4832 (output)--->
And receive it with Audigy 2ZS
The cards I connected through AD_Ext connectors.
On CT4832 its called Aud_Ext. SPDIF out: pins GND 18 and 19 for signal.

On Audigy AD_ext i input SPDIF0 in pins 5 and 6 (6 i used as GND)
So i dont use any proprietary yellow wires.

Both machines are PC, Windows XP.

Thank you for tipps.
A

Tyrsonswood

I've got two systems connected via COAX SPDIF, Output from an Audigy SB0090 at the drive bay and input into the CD/SPDIF input of a Live! SB0220. I made up an internal cable that goes from RCA jack to the CD/SPDIF connector for the Live! machine. Everything works "better than expected" as the Drive bay outputs normal SPDIF, not TTL.... not sure what the specs are for the CD/SPDIF input....... I actually get a louder signal without distortion hooked up this way.

I do notice that I get signal with the RCA plug hot only connected, (part way in) but it doesn't drop out when fully plugged in. Both machines are plugged into AC power at the same location so they share ground, this is why I get signal with just hot connected. Are both of your machines plugged into the same circuit?

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Russ

I see, then can you clarify what you mean when you say "then if i pull the plug half way out"? That is what made me think that you were using a jack on the card. What plug are you referring to (I suppose that you mounted RCA plugs or something to your computer cases?)?

Your connections sound OK to me (from the pinout info for those headers), but I have not tried doing this myself and am not sure of any potential issues there. TravelRec could probably offer better info (if he pops in here).

IIRC (from an old post by TravelRec), CD_SPDIF can handle both TTL and coaxial levels.

AntonLive

Hi, i had posted and then thought exactly same thing: Damn, forgot to mention about the plugs! But it was friday night :-) Sorry again.

I've been trying to build more or less decent systems, so I have put plugs in between. From Aud_ext header runs pair of cables to RCA female plug. Then hi quality coaxial cable ---into other cards RCA plug and eventually Ad_Ext(Audigy ZS2). Pins can't be swapped, i have checked it several times and other, readymade soundcards like M-Audio 410, sends signal and SB Audigy gets it smoothly.

Before making actual brackets and putting whole system together i wanted to test it out, and then found out about this phenomenon. Indeed both PCs are on same wall socket.

On audigy i also put that famous "Livedrive" faking bridge. Pin 25---35.
A

Tyrsonswood

Adding the ground/shield connection of the COAX cable shouldn't shut the signal down if both machines are on the same AC circuit. Check with a meter and see if you have voltage potential between the chassis of those two machines.

I've never connected two systems with the TTL signal like you are trying, I've always used the buffered drive bay connections. Drive bay to drive bay or as I detailed above. It's possible the buffer changes things dramatically......

If your signal is clean and strong enough for use with just the hot connected you could make a "ground lifted" RCA cable, where ground/shield is only connected on one end. I would see this as a temporary solution though.

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