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Android phones and USB DACs - Page 173

post #2581 of 5444

I've had an AT&T version of the Optimus G Pro for a few weeks now.  I'm happy to report that it works marvelously as an audio playing device.  USB audio on the S3 worked well, but would occasionally throw out rather distracting pops.  No ROM or kernel I tried made any difference.  The OGP also benefits from a huge battery.  Running an audio player with the screen off drains it extremely slowely.  

 

Other little tidbits:  Apparently, its screen on time isn't nearly as good as that of the Note 2.  It's much better than the S3 though.  Its LCD screen is astoundingly good.  The bootloader is locked, but a guy on XDA has almost hacked that, so custom ROMs aren't far off.  If you hate Touchwiz like me, you might find LG's skin to be more paletable.  I sure do.  It can also be unlocked for use on T-Mobile.  I even get LTE with it in Seattle.

post #2582 of 5444

A few weeks ago I reported that the GS4 works with the E17, just simply plug and play with no USB audio recorder pro app required. I had tested it on wifi, and 3G, and reported that 3G was dead silent, and that wifi made some light interference with the E17. Well tonight I was sitting at home bored and decided to drive a few miles down the road where there is a 4g signal, I can finally report that the E17 is dead silent with Verizon 4G LTE on the GS4. I was a bit worried that there would be some interference from the 4G signal, but I did not hear any noise at all.   

post #2583 of 5444

I've also been using my D42 with mostly wifi on, but I have a very strong LTE signal here too. I can report that the S3 + D42 is dead silent, at least up to 2pm on the D42 with full volume out of the S3. 

post #2584 of 5444
Sony Xperia Z & iBasso Audio D zero-SE USB DAC/amp:
 
Xperia Z > digital USB audio out >> USB OTG cable provided by the USB DAC/amp maker >> iBasso Audio D zero-SE >> headphones
 
 

 

 

 

 

 

 

post #2585 of 5444
Quote:
Originally Posted by pappy97 View Post

I would love to use USB Audio on the Nexus 10 such that I can use it when it is playing music from google play music, or locally through the stock music player (or another good android music player), NOT through USB Audio Recorder Pro.

I have a Nexus 10 and a Verizon Note 2, both stock unrooted, and it's frustrating because the only way I can enjoy USB Audio on those is with USB Audio Recorder Pro.  I have two USB DACs, Hifimediy Sabre and Fiio E07k.

Since my Verizon Note 2 is from work, that leaves my Nexus 10 which I could root, unlock, and load a recovery and a ROM (well I have a touchpad with 4.2.2 rom, but I can't even get the device to recognize that a USB audio device is plugged in, but I really want this on my Nexus 10). Is there a ROM right now (or a kernel that I use with the stock ROM) that has full support of USB Audio so any DAC I plug in via USB (With USB OTG cable, of course) will work for any audio coming from the Nexus 10, not just using that USB Audio Recorder Pro app?

Thanks!

 

Anybody here have a Nexus 10 and/or Verizon Note 2 in the US?  Really would love to use my Fiio E07k and/or Hifimediy Sabre DAC with either of these without having to use the USB Audio Recorder Pro app.

 

Or just anyone with a Nexus 10 or Verizon Note 2, what are your experiences with DACs?  My experience with xda site is that those people who have these devices don't care about using DACs (or are happy with USB Audio Recorder Pro).

 

Thanks!!!


Edited by pappy97 - 7/6/13 at 1:48pm
post #2586 of 5444

Another USB Audio "soft driver" for Android:

http://winaudiomls.de/joomla/index.php/en/shop/product/view/15/127

 

 

 

 

 

"Many android based smartphones and tablets have an integrated USB-host interface. They support e.g. mass storage device, keyboard, mouse 3G surfsticks but NO audio devices.

 
The android OS supports audio but not external USB audio devices.
 
Today, there are many USB audio devices offering a rich feature set and high-end audio quality. In addition, there are many Audio apps. But none of them can access external devices, because there exist no API.
 
We developed a low level API, which allows app developer to support USB devices.
 
Features
    supports USB audio class compliant devices 
    synchronous input and output
    low latency
    2 channels input and output
    up to 24bit 192khz
 
Requirements
    Android >3.2
    no root access required
    USB host interface
 
We offer a basic demo app, demonstrating the basic features. You can check the compatibility with your platform.
 
 
These Apps are designed as technical demonstration.
 
License
We offer a commercial license either binary as a library or full source code.
 
Prices
The full source code cost 2000 Euro /one time/ unlimited use except reselling or sub-licensing"
 
 
The USB Audio function of USB Audio Recorder PRO is the other USB Audio "soft driver" for Android.
 
"We are also NOT affiliated with a program called 'USB Audio Recorder', 'USB Audio Tester' or 'USB Field Recorder' on the Play Store!"
post #2587 of 5444

here was my promised shots (after I bought the wifey a new phone LOL)

 

 

USB Audio Recorder Pro(paid version) - Fiio E17(plating at 96khz 24-bit audio)  - Brainwavz M2 (bass booming IEMs)


Edited by jcagara08 - 7/7/13 at 2:32am
post #2588 of 5444

2000 Euros for the USB audio drivers?? Holy #$%. I'm hoping maybe the tester app itself works... Will try and report back findings. 

post #2589 of 5444

Hi everybody. I have just bought an external DAC with amp (amp is supplied by external AC adapter) that is connected via USB OTG to a Samsung Galaxy S3. Because the DAC is USB-powered I could see my battery on the Galaxy drain fast when listening to music @ work.

 

Because of that, and because the DAC requires 150 mA and the Galaxy only can output 100 mA, I decided to buy a USB hub…A Belkin 4 ports with external 5 V supply.

 

However, when I connect the Galaxy to the DAC via the USB hub, there is music out of the DAC/amp even if I do not connect the power cable to the USB hub!!

 

It seems that the 5 V supply of the USB hub is just connected in parallel with the 5 V supply from the Galaxy. As the DAC function as load to the 5 V supply, the current supplied by the Galaxy and the USB hub, respectively, will depend on the impedances of the cables according to current division.

 

I would like the USB hub to supply all power to the DAC. I have read a number of DIY USB hub guides saying that the 5 V pin on the USB cable between the Galaxy and the USB hub should be disconnected, to force the DAC only to be powered from the hub. I have tried that, but then the Galaxy does not recognize the DAC and simply plays music out of the internal speakers.

 

Have anybody experienced the same phenomenon? I don’t know why the Galaxy has to be connected to the 5 V of the DAC to recognize the connection.

 

Will the solution perhaps be a series resistance of e.g. 1k Ohms connected in the 5 V wire between the Galaxy and the USB hub?

 

My setup is a mess of different USB cables, as I do not have all the prober cables yet, but it should not matter. It is as following:

Samsung S3 USB audio > USB OTG micro-b to USB A female > USB A male to USB mini-b > Belkin USB hub > USB A male to USB mini-B > DAC


Edited by DonJunker - 7/8/13 at 10:02am
post #2590 of 5444

test


Edited by DonJunker - 7/8/13 at 9:59am
post #2591 of 5444

we are developing an e18 for android phone, but after samsung released S4, we found there are one interesting thing that our E17 can supported android 4.2 but can't supported 4.1 .

 

at the same time, our E07k can supported 4.1 but not 4.2. I am wondering anyone have the same problem? or known what is the difference between 4.2 and 4.1 in the usb driver

 

in the phone.

post #2592 of 5444
Quote:

Originally Posted by DonJunker View Post

 

I would like the USB hub to supply all power to the DAC.

 

 

Another way: the Accessory Charger Adapter way.

 

 

An Accessory Charger Adapter (ACA)-compliant Android device operating as a USB host is also able to charge at the same time.

It draws power from an external battery, or from an ACA-compliant USB DAC.

 

ACA is described in the USB Battery Charging 1.2 specification.

The ACA software program is present in the Linux kernel source code of the Samsung Galaxy S3.

https://github.com/sgs3/GT-I9300_Kernel/blob/master/arch/arm/mach-exynos/p10-battery.c#L248

 

 

A USB OTG device is configured to USB host mode supplying or drawing power, or USB peripheral mode by ACA/OTG software/hardware measuring the value of the ID resistance of the USB interface.

 

According to the value of the ID resistance

. the Android device should act as a USB host, interwork with the USB DAC acting as a USB peripheral, and supply power to the bus-powered USB DAC

. the Android device should act as a standalone USB peripheral, and draw power from an external battery

. the Android device should act as a USB peripheral, interwork with a USB host, and draw power from an external power source

 

. the Android device should act as a USB host, interwork with the USB DAC acting as a USB peripheral, and draw power from an external battery or another external power supply.

 

 

Quote:
Originally Posted by Coop View Post

The cable is not ACA compliant. Samsung uses different resistor values (amongst others) than what is specified in the ACA standards.

Quote:

Originally Posted by Coop View Post

It works!!

Received my new soldering station yesterday, and tonight built me a crude but real world usable OTG + charging cable. In addition to the micro usb-b for the S3 and the mini usb-b for a DAC, it has an additional usb-a connector to hook up to an external usb powersource.

This will allow me to play music via external DAC & use satnav while driving my car without draining my phone battery (the music isnt much of a drain, but satnav with the screen at a useful brightness level...)

Once I find some connectors that I like enough I'll make a nicer finished one, or a few, or maybe a few more and sell some...
post #2593 of 5444
Quote:
Originally Posted by JamesFiiO View Post

we are developing an e18 for android phone, but after samsung released S4, we found there are one interesting thing that our E17 can supported android 4.2 but can't supported 4.1 .

 

at the same time, our E07k can supported 4.1 but not 4.2. I am wondering anyone have the same problem? or known what is the difference between 4.2 and 4.1 in the usb driver

 

in the phone.

 

I have an E07K that I use with Android 4.2.2 no problem. It works just fine.

post #2594 of 5444
Quote:
Originally Posted by JamesFiiO View Post

we are developing an e18 for android phone, but after samsung released S4, we found there are one interesting thing that our E17 can supported android 4.2 but can't supported 4.1 .

 

Interesting!

 

As far as I understand, the FiiO E17 compliancy is as follows:

 

Samsung Galaxy S3’s native USB Audio ≤ 4.1: no

Samsung Galaxy S3’s native USB Audio 4.2: yes

Samsung Galaxy S4’s native USB Audio (4.2): yes

 

Other flagship phones

Sony Xperia Z’s native USB Audio: yes

HTC One’s native USB Audio: yes

LG Optimus PRO’s native USB Audio: yes

 

Another USB Audio: USB Audio Recorder PRO

4.1 / 4.2-powered Samsung Galaxy S3’s USB Audio Recorder PRO: yes

Samsung Galaxy S4’s USB Audio Recorder PRO: yes

Sony Xperia Z’s USB Audio Recorder PRO: yes

HTC One’s USB Audio Recorder PRO: yes

LG Optimus PRO’s USB Audio Recorder PRO: yes

post #2595 of 5444
Quote:
Originally Posted by DanBa View Post

 

Another way: the Accessory Charger Adapter way.

 

 

An Accessory Charger Adapter (ACA)-compliant Android device operating as a USB host is also able to charge at the same time.

It draws power from an external battery, or from an ACA-compliant USB DAC.

 

ACA is described in the USB Battery Charging 1.2 specification.

The ACA software program is present in the Linux kernel source code of the Samsung Galaxy S3.

https://github.com/sgs3/GT-I9300_Kernel/blob/master/arch/arm/mach-exynos/p10-battery.c#L248

 

 

A USB OTG device is configured to USB host mode supplying or drawing power, or USB peripheral mode by ACA/OTG software/hardware measuring the value of the ID resistance of the USB interface.

 

According to the value of the ID resistance

. the Android device should act as a USB host, interwork with the USB DAC acting as a USB peripheral, and supply power to the bus-powered USB DAC

. the Android device should act as a standalone USB peripheral, and draw power from an external battery

. the Android device should act as a USB peripheral, interwork with a USB host, and draw power from an external power source

 

. the Android device should act as a USB host, interwork with the USB DAC acting as a USB peripheral, and draw power from an external battery or another external power supply.

 

 

 

 

Aha thanks! That looks like the solution. Incredible that Samsung and other Android manufacturers don't provide the cable with built-in resistor etc.

 

It then seems that I dont have to change anything in the hub (that when powered must function as the battery in your figure) but instead have to cut up the micro-b OTG connector at the Samsung end of the cable line, and then solder a resistor between ID and GND (gonna be an ugly solution :) ). What should the resistor value be?

 

I have read somewhere that some charge applications require a resistor (think it was around 64k) between the GND and Vbus..or has it been for another application?


Edited by DonJunker - 7/8/13 at 1:41pm
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