CM6631 usb audio interface .... any good ? - Page 40 - diyAudio
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Old 10th September 2013, 03:52 AM   #391
tdtsai is offline tdtsai  Taiwan
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Join Date: Feb 2011
This tool will generate new firmware for CM6631A. You just need to update the firmware which generate by this tool into your device. Please note the firmware which generate by this tool will only enable one I2S output. Basically this firmware is for USB DAC module. Something like follow URL device.
CM6631A USB to Coaxial Optical I2S Output Convertor | eBay
CM6631A 24bit 192kHz USB to Coaxial and Optical Fiber SPDIF and I2S by LJM | eBay
Let you can use those USD DAC module to connect o external DAC like follow:
ES9018 New Ver DAC Fiber USB I2S CPU Coaxial Fiber Decoder 192K 24bit 384K 32bit | eBay
Sabre Hi End DAC 24bit 192kHz with ES9023 WM8804 and I2S Input DIY DAC | eBay
DAC NOS1 Non Over Sampling DAC TDA1543T I2S Input | eBay
If you update this firmware into you device, you device driver should be install automatically. The driver is on windows update. This should be very convenient for DAC DIY user.


Quote:
Originally Posted by Hobbit13 View Post
Looks very nice! Would like to try it!

Does it work with all CM6631A boards, and what firmware do you need?
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Old 10th September 2013, 11:48 AM   #392
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Join Date: Jun 2013
@tdtsai
Your I2S Configtool saved my day :-). Thank you for affords!
Now I can connect my CM6631 via I2S. Before, the double rate Bitclock (x128 FS) made the I2S Out unusuable with my DSP.

Any Plans to update your tool? I think for many CM6631A users, this is a needful Tool.

Are there more parameters which could be set up via the firmware? Does anyone have a data manual, with all the register settings explained for cm6631a?

BTW: I used the tool with the CM6631A from Breeze Audio (gray metall case).
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Old 11th September 2013, 05:16 AM   #393
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tdsai, you made me sell my old CM6631 based pcb and order a new one based on the newer CM6631A
so I will contact you over on pm with an email adress if you'll be so kind to also send me this great tool, thanks
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Old 12th September 2013, 08:45 AM   #394
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Location: GE
Quote:
Originally Posted by tdtsai View Post
I ordered one like the board in your second link. So I would like to try your firmware. Could you send me a PM? Thanks in advance!

I'm going to use it in combination with a Philips SACD1000, which has a Cirrus CS4397 and HDAM output modules (and a horrible CD transport!). With a Tenor 7022 USB interface I reach -103dB THD (1KHz), let's see if that improves with the CM6631A interface. (it's allready beyond the specs of the CS4397!)
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Old 12th September 2013, 10:54 AM   #395
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Quote:
Originally Posted by DEFL View Post
After consulting with tdtsai I give up the idea of replacing 6631 with 6631A on Asus E1 DAC.
what reason for give up? interested in details. pm me if u don't want to post it here
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Old 13th September 2013, 06:16 AM   #396
tdtsai is offline tdtsai  Taiwan
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Join Date: Feb 2011
Hi
I also want to does there any different. Please PM me your email then I can email you the tool. But If you can use TE7022 to reach -103dB THD there should does not have improve because the spec of CS4397 say the THD is -100dB. Please check follow URL: CS4397 : 24-Bit, Multi-Standard Stereo D/A Converter
But I think there should has improve in SNR.

Quote:
Originally Posted by Hobbit13 View Post
I ordered one like the board in your second link. So I would like to try your firmware. Could you send me a PM? Thanks in advance!

I'm going to use it in combination with a Philips SACD1000, which has a Cirrus CS4397 and HDAM output modules (and a horrible CD transport!). With a Tenor 7022 USB interface I reach -103dB THD (1KHz), let's see if that improves with the CM6631A interface. (it's allready beyond the specs of the CS4397!)
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Old 14th September 2013, 08:35 PM   #397
cykad is offline cykad  Poland
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Has anyone firmware for CM6631 (non-A) with I2C output?
(Firmware 2203 is the only for USB/SPDiF converters (only SPDiF output))
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Old 18th September 2013, 11:40 AM   #398
emueyes is offline emueyes  Australia
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Join Date: Jun 2013
I have an incredibly noob question, figured this seems like a good place, at least I'm on topic..

I have seen the CM6631A USB daughter cards on eBay, both assembled with USB and coax/optical sockets and bare with a row of headers.

Are these actually 'USB soundcards' ? That is, could I plug one onto a computer and with the right drivers, treat them as a soundcard and send the optical/coax output to an amplifier? In that case, is it complete as is, or does it still need power?

That was my original impression, until I started reading more about their incorporation into DACs with other cards (high end looking DACs, at that). So there seems to be more to it than I thought.

My use case is an ARM based micro board with nice graphics but abysmal sound hardware. I have seen Linux drivers for the CM6631A chip and tried putting 2 and 2 together, with a bit of a wish as well. All ARM dev boards seem to do this it seems, nice gfx but they forgot about the audio. With proper sound though they could make a nice little music server hung off the LAN and controlled with DLNA, without having to power up a computer.

So is my hope, anyway. If they are actually able to be used as such, are the boards with pin headers missing anything else, it'd be tidier to use one and do all the cabling internally apart from the final output.

Of course, I may well have opened another box here, and will now be playing with DACs and amps too.. some of the finished products here look nice, though a lot of them geared toward phones. Having recently moved, I'm revelling in being able to use speakers and have the AT phones on the shelf for a while.
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Old 19th September 2013, 09:21 AM   #399
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Location: GE
Quote:
Originally Posted by emueyes View Post
I have an incredibly noob question, figured this seems like a good place, at least I'm on topic..

I have seen the CM6631A USB daughter cards on eBay, both assembled with USB and coax/optical sockets and bare with a row of headers.

Are these actually 'USB soundcards' ? That is, could I plug one onto a computer and with the right drivers, treat them as a soundcard and send the optical/coax output to an amplifier? In that case, is it complete as is, or does it still need power?

That was my original impression, until I started reading more about their incorporation into DACs with other cards (high end looking DACs, at that). So there seems to be more to it than I thought.

My use case is an ARM based micro board with nice graphics but abysmal sound hardware. I have seen Linux drivers for the CM6631A chip and tried putting 2 and 2 together, with a bit of a wish as well. All ARM dev boards seem to do this it seems, nice gfx but they forgot about the audio. With proper sound though they could make a nice little music server hung off the LAN and controlled with DLNA, without having to power up a computer.

So is my hope, anyway. If they are actually able to be used as such, are the boards with pin headers missing anything else, it'd be tidier to use one and do all the cabling internally apart from the final output.

Of course, I may well have opened another box here, and will now be playing with DACs and amps too.. some of the finished products here look nice, though a lot of them geared toward phones. Having recently moved, I'm revelling in being able to use speakers and have the AT phones on the shelf for a while.
Your question depends really on the implementation of the board in Question. The CM6631A is an USB audio controller. Whether it can serve as a "full" sound card, depends on all other components that were placed upon the device.

In general those boards are equipped as "Plug-and-play" sound cards that output a stereo stream to a digital receiver (spdif). Most boards can get their power supply from the USB.

The CM6631A is not compatible with the old "USB audio" specification. It does comply with newer "UAC" specifications, depending on your OS, you'll need new/extra drivers.


Please mention what specific CM6631A board you are using, what ARM platform you are using and what OS you are running on this ARM platform.
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Old 19th September 2013, 10:20 AM   #400
emueyes is offline emueyes  Australia
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Join Date: Jun 2013
Thanks for the reply. I have two boards, Inforce Computing - Product-IFC6410
and ODROID | Hardkernel

The Snapdragon runs Fedora 19, the Odroid has Ubuntu 13; I would like to use the Snapdragon for this project, the U2 is pretty much busy.

The board I was looking at in in the beginning is HI FI CM6631A 192kHz 24bit USB 2 0 TO Coaxial Optical Spdif Convertor DAC Board | eBay
although I have since seen more discussion and many more boards at

The right USB DAC for your Raspberry Pi - RaspyFi

I believe I need the same thing. Some are also almighty expensive ! I was hoping to find a board that I could include inside a case, with the ARM board, disk drive and PSU to make a self contained unit. If not, something more or less inline, to go between the ARM board and the receiver.

Many thanks for help on this, it is very confusing. For one thing, I don't see that I need a DAC, both USB and SPDIF are digital. The DACs in my receiver, a Denon X1000 should be quite OK, indeed I'm very happy with them playing audio over HDMI [just why audio-over-HDMI isn't a feature of these ARM boards is a matter I'm talking with them about. It is especially galling when the tout accelerated video playback as a major feature].

There are many boards linked off that page on RasPis, I imagine I vould just choose one that suits my budget and proceed, though I'm still confused nt the DAC thing. I have seen a card CM6631A USB Daughter Card | eBay which is appealing because it could be included in a case, and is relatively inexpensive. The other is this one Xmos 192kHz High Quality USB to SPDIF with Ultralow Noise 6 5UV Regulator | eBay specifically stating Linux use. I realise I could buy some little $80 Android box, but that is effectively what I'm trying to build, and enjoy this, hence the ARM boards in the first place.
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