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Tenor 7022L problem in ODAC and O2 combo, only support 48/24

post #1 of 2
Thread Starter 

I have bought a ODAC and O2 combo in my country China.

But the manufacturer use Tenor 7022L instead of 7022 because 7022 is sold out.

That is where the problem come from

 

when I 

cat /proc/asound/card1/stream0

 

I get these info

 


Tenor Electronics DigiHug USB Audio at usb-0000:00:1a.0-1.1, full speed : USB Audio

Playback:
Status: Stop
Interface 3
Altset 1
Format: S16_LE
Channels: 2
Endpoint: 3 OUT (ADAPTIVE)
Rates: 44100, 48000
Interface 3
Altset 2
Format: S24_3LE
Channels: 2
Endpoint: 3 OUT (ADAPTIVE)
Rates: 44100, 48000

Capture:
Status: Stop
Interface 2
Altset 1
Format: S16_LE
Channels: 2
Endpoint: 2 IN (ADAPTIVE)
Rates: 44100, 48000

 

 

This shows the ODAC only support up to 48/24, so  I googled and got this

http://www.hydrogenaudio.org/forums/index.php?showtopic=99982

The main information in the post is:

"Due to 12Mbps bandwidth limitation of the USB full speed operation, only one I2S input or output can be set for 24bit/96KHz application, under this condition, for simultaneous multiple-channel applications, rest of I2S interfaces has to be configured at the combination of 16-bit / 48KHz, 16-bit/96KHz and even lower resolution/sampling rate. In the application of USB internet telephony, lower resolution and sampling rate are needed."

"For audio interfaces ( input and output or D to A and A to digital, like in recording interfaces) USB full speed have limitations :
- 2 Inputs and 0 Outputs at 24Bit / 96kHz
- 0 Inputs and 2 Outputs at 24Bit / 96kHz
- 4 Inputs and 2 Outputs at 24Bit / 44.1 or 48kHz
- 2 Inputs and 4 Outputs at 24Bit / 44.1 or 48kHz
- 4 Inputs and 4 Outputs at 16Bit / 44.1 or 48kHz
- 2 Inputs and 8 Outputs at 16Bit / 44.1 or 48kHz (Sonica Theater)
- 4 Inputs and 4 Outputs with every other sample rate up to 16Bit/44.1kHz."

"THe problem is, since os x 10.6, some audio DAC, though only having output capacity (d to a), are wrongly recognized as having both input and output. That's why I see both in and out in "audio midi settings"!!

 

But, I have connect my ODAC to mac(OS X10.8), linux (ubuntu 12.04), win7, and they display the same information:

1. ODAC only supports up to 48/24

2. System  recognizes the ODAC as a input (unavailable) and a output

So I think maybe it's not a problem of OS but the problem of the chip 7022L itself

 

What is your guy's opinion? 

If u have the device, can u try it doing a experiment and post your result?

 

Thanks in advance.

post #2 of 2

Check http://www.gfec.com.tw/c/document_library/get_file?uuid=cb70f198-3aae-4cb6-801d-3489fd0804cd&groupId=19499

 

I have a TeraDak TeraLink X2 using the Tenor TE7022L and it will do 16/24 bit, 8/16/32/44.1/48/96 KHz.  It does not support 88 KHz.

 

Edit: It looks like the limitation is on the I2S port.


Edited by Bugdozer - 12/12/13 at 7:41am
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