Rockbox Technical Forums

Rockbox Development => New Ports => Topic started by: staeff on April 10, 2015, 08:38:36 AM

Title: XDUOO X2 Port possible?
Post by: staeff on April 10, 2015, 08:38:36 AM

The XDUOO X2 is called the Sansa Clip successor because of its quite good amplifier.
http://www.xduoo.com/xduoo/EnProductShow.asp?id=60

The sound is very good, the Interface, however, is a mess.


(http://alexmod.com/ma9_files/X22.jpg)
Another one: http://cdn.head-fi.org/a/ae/ae75484a_09-23524359713.jpeg (http://cdn.head-fi.org/a/ae/ae75484a_09-23524359713.jpeg)


It seems to have a  Artek ak2117c http://wenku.baidu.com/view/32878a01763231126edb1157.html multimedia chip.

Would this met the Rockbox requirements?

Title: Re: XDUOO X2 Port possible?
Post by: wodz on April 10, 2015, 09:10:35 AM

'51 is 8bit processor. Decoding is handled by dedicated audio and video engine. The ram is tiny as well. So to short things the rb port is not possible for this platform.

Title: Re: XDUOO X2 Port possible?
Post by: saratoga on April 10, 2015, 11:37:18 AM

200 mW power draw RF amp used for headphone out.  I bet battery life is as good as the ui.

Title: Re: XDUOO X2 Port possible?
Post by: MakingIt on June 23, 2015, 04:45:09 AM

Are you saying that all the audio/video decoding is done in SW in the RockBox OS and using a dedicated "Audio DSP" as is inside the X2 would be too complex to use?
Where can I read about these details?

By the way, the output operational is an lmh6643, a rail to rail voltage amplifier with up to 75mA of output current. I dont understand the "200 mW power draw RF amp used for headphone out." comment.

http://www.ti.com/product/lmh6643


Thanks

Title: Re: XDUOO X2 Port possible?
Post by: charleski on June 23, 2015, 08:13:19 AM

The LMH6643 (https://www.jameco.com/Jameco/Products/ProdDS/842507.pdf) is specifically designed for low power draw. Its high output current capability makes it a reasonable choice for driving low-impedance headphones, though it's really designed as a video amp.

Title: Re: XDUOO X2 Port possible?
Post by: saratoga on June 23, 2015, 11:10:04 AM

Quote from: MakingIt on June 23, 2015, 04:45:09 AM

Are you saying that all the audio/video decoding is done in SW in the RockBox OS and using a dedicated "Audio DSP" as is inside the X2 would be too complex to use?

Basically you need a device with a real CPU, a simple 8 bit microcontroller isn't enough.