Pcm2902 Spdif In

mitchjs · 13th February 2005, 07:37 PM

Hi all,

Has anyone here used the PCM2902's digital in?

I build a little board, pretty much as designed in the datasheets

it only works when i send audio in though its l/r analog inputs

i connected a TORX179 to the SPDIF input, and connected a few different devices to it, nothing...

I connected my cabletv box, not on a digital channel, so it was just PCM audio, i connected my xmradio with optical out, which is set to consumer mode no copy prot. nothing....

any ideas?

mitch

paologatto · 13th February 2005, 08:08 PM

it works fine!

jgeissin · 14th February 2005, 12:40 PM

Don't you have to reset the chip when pumping digital into it so that it will cync on the incoming clock?
I saw something to this effect on Rod Elliot's site (ESP).

paologatto · 14th February 2005, 12:51 PM

>Don't you have to reset the chip..?

uhm.. no. When there are incoming digital data, the chip automatically switch to digital in, as described in the datasheet.
By the way, I have implemented the PCM290x in these soundcards:

http://purebits.com/usbsoundcards.html

and I must say that I never had problems with digital input. Checked with many different sources: CD players, other soundcards, Home Theatre systems..

Try to check the digital signal path from the TORX179 to the digital input in the PCM2902.

BTW, in my project I used the TORX173.

Ciao!

mitchjs · 19th February 2005, 07:14 PM

grrr, i cant get squat...

in the windows mixer it shows up as microphone
is that correct?

also, im taking the output of a DIT4096 directly to pin 24 (DIN)
and nothing!!!!!

assuming the output of the DIT4096 is not copy protected, im pretty sure its not, but thats vague in the manual too...

here...

COPY L Status
0 0 Consumer Mode, PRO = 0, COPY = 0, L = 0
0 1 Consumer Mode, PRO = 0, COPY = 0, L = 1
1 0 Consumer Mode, PRO = 0, COPY = 1, L = 0
1 1 Professional Mode, PRO = 1, No Copy Protection

i have it set to, COPY PIN is high, and L PIN is LOW

so the vagueness, does COPY = 1, copy allowed or NO COPY
or is it COPY = 0, allow copy, then what is the L? generation?

i tried pro mode, nothing too!

help!
mitch

paologatto · 19th February 2005, 11:05 PM

When the PCM290x is attached to USB port, Windows will recognize it as an USB audio device and it will appear in your device manager.
First of all, check in device manager if an USB audio device is listed in the category "Controllers, Audio and games". If not, the PCM290x is not working or not recognized by windows.

When installed, the mixer for the PCM 290x supports only wave out and main out, not the input (I mean that the input level cannot be modified by the user).

I read that you get the spdif signal directly from another spdif transmitter. Have you tried also getting the spdif from another source such as a normal CD player?

mitchjs · 20th February 2005, 08:02 AM

it shows up as a usb audio, the Analog inputs of the PCM2902 work fine, i attach some audio there, and bingo, its in to the pc

the only other device i got that has spdif out, is my digital catv box, and i tried it on a pcm audio channel...

nada...

oh, i got a slimp3, i could try that...

also, i notice the ic runs a bit warm, not hot, warm

which i think is still odd

thanks for your help, i reall want this to work!
mitch

mitchjs · 20th February 2005, 08:02 AM

BINGO

SLIMP3 works!

ok, so now i guess it runs home to momma on copyprotection?

ok, so i got my dit4096 wired wrong???

i need some help figuring that out i guess

back to this crap:

COPY L Status
0 0 Consumer Mode, PRO = 0, COPY = 0, L = 0
0 1 Consumer Mode, PRO = 0, COPY = 0, L = 1
1 0 Consumer Mode, PRO = 0, COPY = 1, L = 0
1 1 Professional Mode, PRO = 1, No Copy Protection

ok, also, when i disconnect the optical cable, it sometimes goes all staticy, any ideas there?

mitch

mitchjs · 3rd March 2005, 10:18 PM

bump...

does anyone know the interpertation of those pins?

1 = copy allowed or 1 = copy protection enabled???

thanks
mitch

Thoru · 4th March 2005, 02:41 PM

Paologatto,

Could you please tell me something about the coaxial outputs you created? I've used the same chip for a USB soundcard, but I only have opto out now. I'm afraid that with the 10mA out of the PCM2902, that I can't drive a s/pdif link directly.
So I was thinking about using a transformer.
Could you please comment on that?

Remco Poelstra
P.S. This is the same question as in my other post from yesterday

13th February 2005, 07:37 PM	#1
mitchjs diyAudio Member Join Date: Oct 2004	Pcm2902 Spdif In Hi all, Has anyone here used the PCM2902's digital in? I build a little board, pretty much as designed in the datasheets it only works when i send audio in though its l/r analog inputs i connected a TORX179 to the SPDIF input, and connected a few different devices to it, nothing... I connected my cabletv box, not on a digital channel, so it was just PCM audio, i connected my xmradio with optical out, which is set to consumer mode no copy prot. nothing.... any ideas? mitch

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13th February 2005, 08:08 PM	#2
paologatto diyAudio Member Join Date: Jun 2004 Location: Italy	it works fine!

14th February 2005, 12:40 PM	#3
jgeissin diyAudio Member Join Date: Jan 2005 Location: Elliottsburg, PA	Don't you have to reset the chip when pumping digital into it so that it will cync on the incoming clock? I saw something to this effect on Rod Elliot's site (ESP).

14th February 2005, 12:51 PM	#4
paologatto diyAudio Member Join Date: Jun 2004 Location: Italy	>Don't you have to reset the chip..? uhm.. no. When there are incoming digital data, the chip automatically switch to digital in, as described in the datasheet. By the way, I have implemented the PCM290x in these soundcards: http://purebits.com/usbsoundcards.html and I must say that I never had problems with digital input. Checked with many different sources: CD players, other soundcards, Home Theatre systems.. Try to check the digital signal path from the TORX179 to the digital input in the PCM2902. BTW, in my project I used the TORX173. Ciao!

19th February 2005, 07:14 PM	#5
mitchjs diyAudio Member Join Date: Oct 2004	grrr, i cant get squat... in the windows mixer it shows up as microphone is that correct? also, im taking the output of a DIT4096 directly to pin 24 (DIN) and nothing!!!!! assuming the output of the DIT4096 is not copy protected, im pretty sure its not, but thats vague in the manual too... here... COPY L Status 0 0 Consumer Mode, PRO = 0, COPY = 0, L = 0 0 1 Consumer Mode, PRO = 0, COPY = 0, L = 1 1 0 Consumer Mode, PRO = 0, COPY = 1, L = 0 1 1 Professional Mode, PRO = 1, No Copy Protection i have it set to, COPY PIN is high, and L PIN is LOW so the vagueness, does COPY = 1, copy allowed or NO COPY or is it COPY = 0, allow copy, then what is the L? generation? i tried pro mode, nothing too! help! mitch

19th February 2005, 11:05 PM	#6
paologatto diyAudio Member Join Date: Jun 2004 Location: Italy	When the PCM290x is attached to USB port, Windows will recognize it as an USB audio device and it will appear in your device manager. First of all, check in device manager if an USB audio device is listed in the category "Controllers, Audio and games". If not, the PCM290x is not working or not recognized by windows. When installed, the mixer for the PCM 290x supports only wave out and main out, not the input (I mean that the input level cannot be modified by the user). I read that you get the spdif signal directly from another spdif transmitter. Have you tried also getting the spdif from another source such as a normal CD player?

20th February 2005, 08:02 AM	#7
mitchjs diyAudio Member Join Date: Oct 2004	it shows up as a usb audio, the Analog inputs of the PCM2902 work fine, i attach some audio there, and bingo, its in to the pc the only other device i got that has spdif out, is my digital catv box, and i tried it on a pcm audio channel... nada... oh, i got a slimp3, i could try that... also, i notice the ic runs a bit warm, not hot, warm which i think is still odd thanks for your help, i reall want this to work! mitch

3rd March 2005, 10:18 PM	#9
mitchjs diyAudio Member Join Date: Oct 2004	bump... does anyone know the interpertation of those pins? 1 = copy allowed or 1 = copy protection enabled??? thanks mitch

4th March 2005, 02:41 PM	#10
Thoru diyAudio Member Join Date: Jan 2004 Location: Eindhoven	Paologatto, Could you please tell me something about the coaxial outputs you created? I've used the same chip for a USB soundcard, but I only have opto out now. I'm afraid that with the 10mA out of the PCM2902, that I can't drive a s/pdif link directly. So I was thinking about using a transformer. Could you please comment on that? Remco Poelstra P.S. This is the same question as in my other post from yesterday

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