CM6631 usb audio interface .... any good?

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T

Traktorist3d

Member
Joined 2015
tdtsai said:
Hi
Yes, I work with CM6631A. The configuration tool can not work with CM6632A is because configuration tool only configurate 2 channel. For multi-channels there can be more combination. Some vendor use 2 channel codec + 6 channel codec. Some vendor use 8 channel codec. It is very hard to write a configuration tool to fit all combination.
So I think the best way for CM6632A is to write a customer firmware by vendor.
Click to expand...

You mean to order the firmware from the manufacturer of the chip itself? Have a C-MEDIA company?
 
T

Traktorist3d

Member
Joined 2015
What do you think, if try to install the driver from the ACS U7, it also has 6632 with memory, like additional chips identifying the U7 is not visible on the board. What do the drivers think?
 

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T

tdtsai

Member
Joined 2011
Hi
It should not work. Because ASUS U7 has special version driver for it. It has some customize feature like output switch, software volume, input switch ... etc. More important is ASUS U7 has some audio effect on it. If driver identify the chip is not U7 the driver shall not start or can not install.

Traktorist3d said:
What do you think, if try to install the driver from the ACS U7, it also has 6632 with memory, like additional chips identifying the U7 is not visible on the board. What do the drivers think?
Click to expand...
 
N

neptunes4you

Member
Joined 2012
Hi! I have a CM6631A based USB to I2S converter, and i would like to use it with a TDA1543 at 192kHz 16 bit. Since the TDA1543 supports 9.2MHz BCLK, i would need a 16 bit frame. But it seems like the CM6631A outputs 32 pulses at the BCLK even for 16 bit data, which unnecessarily doubles the BCLK. Is there any firmware that can help me achieve my goal?
 
C

canvas

Member
Joined 2003
spicetree.no-ip.com
neptunes4you said:
Hi! I have a CM6631A based USB to I2S converter, and i would like to use it with a TDA1543 at 192kHz 16 bit. Since the TDA1543 supports 9.2MHz BCLK, i would need a 16 bit frame. But it seems like the CM6631A outputs 32 pulses at the BCLK even for 16 bit data, which unnecessarily doubles the BCLK. Is there any firmware that can help me achieve my goal?
Click to expand...

IanCanada's I2S-to-PCM board can do the conversion for you. You may select 16/18/20/24bit output.
 
N

neptunes4you

Member
Joined 2012
canvas said:
IanCanada's I2S-to-PCM board can do the conversion for you. You may select 16/18/20/24bit output.
Click to expand...

Hi! Yes, i know that, however i am thinking on a DIY friendly solution. Is there a S/PDIF receiver that can support 32fs for 16 bits of data? I mean, this 64 bit frame exists on the I2S BCLK, but i don't know if the same is true to the S/PDIF output as well.
 
M

MisterJones

Member
Joined 2018
Hello altor;
Get a copy of SimpleHID program. With the device plugged in USB and USB is recognized (driver or not) you can get Vendor and PID information. On the bottom of the page select "Info" and get the build string. The core technology is fall back to USB1.0. The USB can appear as 2.0 on port and be 1.0 by speed causing the erratic behavior you describe. In my software it is me making silly mistakes that slow down the USB read/ write. A generic C-Media USB driver should work. In win98 you won't get special functions that way but at least you will know if the product can speak bytes and not just BITES. Also physical connector and cables. C-Media supplies the hardware reference Https://www.cmedia.com.tw/support/download_center just find the correct unit at the bottom of the page.
 
abraxalito

abraxalito

Member
Joined 2007
neptunes4you said:
Is there a S/PDIF receiver that can support 32fs for 16 bits of data? I mean, this 64 bit frame exists on the I2S BCLK, but i don't know if the same is true to the S/PDIF output as well.
Click to expand...

I've searched amongst several S/PDIF receivers (Cirrus/Wolfson, AKM,TI) and have not found one that outputs 32fs and 16bits per channel. They all output 64fs and 32bits.
 
N

neptunes4you

Member
Joined 2012
Wow, this looks good. Had the same experience with CMEDIA, the support team is very slow, and they never ever answer my questions properly.

Did you build this? How is it that you have left the microcontroller connected to the I2C out from the design?

IVX said:
I have to share my cm6631A(N-mosfet only for cm6631) project because I've found reliable and useful info about this chip only here, chinese and russian DIY area. Nothing from cmedia, really zero.. quite weird company ))

CM6631A (3-11-2018 12-47-19 PM).zip — Yandex.Disk


Untitled-1.jpg
Click to expand...
 
N

neptunes4you

Member
Joined 2012
IVX said:
neptunes4you, yes I did, see attached pic. There is a slightly different project (tas5558+tas5624+LLC SMPS +BLE IOS/Android app control, PCBA 139x100x27mm) but due to low impedance GND plane, 6631A works stable even being close to hard switching nodes of class D stage.
Click to expand...

Super cool! And i assume you have uploaded the firmware with the CMEDIA firmware tool right?
 
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