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Old November 19th, 2009, 04:03 PM   #1 (permalink)
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Default USB audio output on a Droid?

I'm toying with the idea of making a car dock for my Droid. The official Droid dock doesn't work with any cases and if the iPhone is any indication, no one will ever make one that does. Plus, it doesn't do everything I want.

I want to plug my phone in with as little fuss as possible, have it charge, output audio to my car stereo through USB. Charging is absolutely necessary, and I want to avoid using the headphone jack for audio if I can because it's an extra thing I'd have to plug in rather than just sliding the phone right in the dock. Better yet if the USB audio output is a constant volume intended for control on another device.

So.. Is it possible? If I need hack a car charger in to a usb audio cable I'm fine with that (unless I could get both in one). This thing would do it, but it looks like it has more pins than standard usb (can't really tell in that pic, but maybe someone knows?), and the Droid doesn't.

My other options are connecting the Droid directly to the head unit via USB and mounting it as a mass storage device, but I prefer the way the Droid handles music better than the head unit, and mounting the USB is an extra step I'd probably get too lazy for. And finally, I'd considered making an app that spoofs an iPod, since my HU has iPod controls, but that's more work than it's worth when the Android music player's controls are just as good.

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Old November 20th, 2009, 10:17 AM   #2 (permalink)
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Well, I did some digging and found this for the RAZR and other Moto phones:
Amazon.com: Motorola Mini OEM Original RAZR V3, V3c, V3m, V3i, V3t, V3e, V3r, SLVR L7, L6, L2, L7c PEBL U6, KRZR K1m, K1 USB to 2.5mm Headset Audio: Cell Phones & Service

I think I'm going to order one, hack a micro USB connector on to it and see what happens. Not getting my hopes up after looking at this, but for $4 shipped I might as well try it out.
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Old November 20th, 2009, 03:35 PM   #3 (permalink)
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Keep this updated please, I have a similar issue. I wanna be able to run pandora through my car speakers..
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Old November 20th, 2009, 05:31 PM   #4 (permalink)
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This was probably 1 one the cleanest intergration of cell/car stereo system
But will be different for Droid users because of the car/dock home functionhttp
http://forums.crackberry.com/f86/connecting-storm-car-stereo-200470/
post 14
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Old November 20th, 2009, 06:17 PM   #5 (permalink)
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What that guy did was still using the mass storage so he was basically just playing the contents of the microSD card via the car stereo's USB port.

It would be sweet to connect the Droid via USB like dropping an iPod in a dock and then output the audio via USB, whether it was an mp3, Pandora, or whatever.

I suspect, though, that to do that will be quite difficult. The dock would have to establish and ADB connection with the phone (and the phone would have to be placed in USB debugging mode), and even then, I'm not positive it would work. I think this will have to be something that Google will have to add to the ASOP project officially in order to get 3rd party dock support.
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Old November 20th, 2009, 06:53 PM   #6 (permalink)
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Yeah, the fact is that right now, the USB port just isn't DESIGNED to output sound. Think of it this way. Imagine a radio/alarm clock with an 3.5mm line in for plugging in an MP3 player (the iHome is an example of this). That port is DESIGNED to have an MP3 player plugged into it to route the music from the MP3 player to the iHome's speakers. Physically, you can plug in headphones to that port, yes. But you won't hear the iHome's radio through it no matter what you do. I'm not sure if Google will or is even able to enable this in future updates. This is not my area of expertise.
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Old November 20th, 2009, 07:02 PM   #7 (permalink)
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If you take the USB to mirco USB cable provided with the charger and plug it into a car deck with a USB input the phone will charge and be treated the same as using a thumb drive. The micrsd card mounts and then you can control the music from your deck. I tried this last week in my car. But I think that is the only way it'll work.
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Old November 20th, 2009, 07:38 PM   #8 (permalink)
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I can was basically thinking of doing what that guy did in the link and wanted to add a motorola t505 to the deal.(post 26 in the same link)
That way, it looks clean with the dock and i can use bluetooth to stream audio to the stereo system.
The only con would be the sound quality of audio coming from the car stereo.
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Old November 20th, 2009, 08:58 PM   #9 (permalink)
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Originally Posted by SlaveUnit View Post
If you take the USB to mirco USB cable provided with the charger and plug it into a car deck with a USB input the phone will charge and be treated the same as using a thumb drive. The micrsd card mounts and then you can control the music from your deck. I tried this last week in my car. But I think that is the only way it'll work.
Yeah, you can ACCESS files from the SD card using mass storage, but you can't actually send audio data through the micro USB. Not now, at least. Who knows though.
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Old November 20th, 2009, 11:40 PM   #10 (permalink)
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YES - I want EXACTLY the same thing --- to play Pandora through my existing car stereo. I have a Lexus RX400h and know I have to buy an adapter in order to do this. PLEASE if anyone knows what I need to buy let me know.
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Old November 21st, 2009, 12:10 AM   #11 (permalink)
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interesting after getting rid of my iphone i had a useless full speed ipod cable for my headunit which was specifically for the ipod/iphones to display video and what not oh well, anyhow for those with usb connection via headunit you should be able to play music just fine...if connected. or you can always go old school and do it via AUX but that wouldn't charge the phone...
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Old December 8th, 2009, 06:40 AM   #12 (permalink)
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Hi all.. new member!

My Hyundai Sonata actually has an Ipod mode on it that uses a special cable attached to the USB and 3.5mm jacks together. This makes me wonder if the way it works is by controlling the Ipod with USB, but sending the audio via the AUX in. I wonder if we could hack together a controller that would intercept the Ipod USB messages from the head unit and convert them to control the droid? I would assume that Apple has it's own proprietary messaging that we would have to figure out, in addition to solving the droids USB control, that is, if Droid even allows USB control. Ideas?

Mike
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Old December 8th, 2009, 07:12 AM   #13 (permalink)
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Originally Posted by RaptrFlite View Post
Hi all.. new member!

My Hyundai Sonata actually has an Ipod mode on it that uses a special cable attached to the USB and 3.5mm jacks together. This makes me wonder if the way it works is by controlling the Ipod with USB, but sending the audio via the AUX in. I wonder if we could hack together a controller that would intercept the Ipod USB messages from the head unit and convert them to control the droid? I would assume that Apple has it's own proprietary messaging that we would have to figure out, in addition to solving the droids USB control, that is, if Droid even allows USB control. Ideas?

Mike
I don't know if control via USB is supported but control via bluetooth is. I have a JVC KD-A805 and I am able to FF, RW and pause using the buttons on my stereo. It works for the stock media player as well as for Pandora.
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Old December 8th, 2009, 07:24 AM   #14 (permalink)
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Originally Posted by skylinedrifter View Post
I don't know if control via USB is supported but control via bluetooth is. I have a JVC KD-A805 and I am able to FF, RW and pause using the buttons on my stereo. It works for the stock media player as well as for Pandora.
Nice! My HU doesn't have BT
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Old December 8th, 2009, 11:27 AM   #15 (permalink)
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Originally Posted by skylinedrifter View Post
I don't know if control via USB is supported but control via bluetooth is. I have a JVC KD-A805 and I am able to FF, RW and pause using the buttons on my stereo. It works for the stock media player as well as for Pandora.
I have a Sony radio , I wonder if it will control the droid , so I can skip tunes.
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Old December 17th, 2009, 02:52 PM   #16 (permalink)
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well I feel like an idiot. i paid $350 to have a PDIM (personal device interface manager, basically a USB port) installed in my 2010 camaro, only to read this thread, have my curiosity piqued, and went and sat down and set up my cars bluetooth. Damnit. i can stream pandora through the stereo with minimal skipping...bye bye xm satellite radio once my free trial is up! and if you're just using the main music app on the droid, (the HTC droid eris) at least, you can skip using the stereos buttons rather than looking at the phone, which was the whole point of getting the PDIM! Oh well, at least i figured it out before i dumped another $300 into getting an ipod. All in all, I basically paid $350 for a car charger for my droid.

epic fail.
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Old December 17th, 2009, 03:26 PM   #17 (permalink)
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well I feel like an idiot. i paid $350 to have a PDIM (personal device interface manager, basically a USB port) installed in my 2010 camaro, [snip]
All in all, I basically paid $350 for a car charger for my droid.

epic fail.
Naw! I'd bet you can get at least $300 of that back on FreeBay.
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Old December 19th, 2009, 09:55 AM   #18 (permalink)
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Well, I've done some more looking around and it looks like A2DP with Bluetooth is going to be the best way to go, and then just a regular charger.

This thing is a BT receiver with 3.5mm output Amazon.com: BlackBerry Remote Stereo Bluetooth Gateway for BlackBerry 8100, 8110, 8120, 8130, 8300, 8310, 8320, 8330, 8800, 8820, 8830, 9000 (Black): Cell Phones & Service

I got a couple of these things to play with Bluetooth to RCA, Fits ALL Car Stereo AUX IN, IPOD MP3 - eBay (item 270337523490 end time Dec-26-09 02:25:00 PST)

I have one wired up to the receiver in my garage and it's working alright, but the sound quality sucks -- hopefully it's just the old receiver. It's been too cold to work in the truck.

The problem with these is you'll have to have an aftermarket stereo with aux input. Or you could skip these things and get a stereo that has BT (but make sure you get one that supports A2DP or it will let you do hands free calling but not stream music). The last thing is they do make some BT->FM transmitters. If you could find a wired one (FM transmitters are usually pretty damn weak but one thats wired in to your antenna should be pretty decent).

I think I have the garage cleaned out enough to get the Sequoia in it today so I can mess with it. We'll see.
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Old December 19th, 2009, 12:12 PM   #19 (permalink)
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I wanted a good solution for playing audio through my car stereo and read good reviews on the Motorola t505 bluetooth speakerphone, which has a built-in FM transmitter so I can play everything through my car stereo (in a fairly high radio-traffic Fort Lauderdale area). I was sceptable but picked on up at Best Buy for around $75 and it has worked great with playing my mp3's and streaming DroidLive and various other stuff I have installed. It is also a fantastic hands free bluetooth speakerphone (the people I call don't even know I am using a speakerphone). I do have a fairly critical ear (been playing keyboards professionaly for more years then I would like to admit) and it does sound great (reduced all my MP3's to a 128 bitrate to save space on my SD card). I am sure that there is better fidelity using more complex solutions but the Motorola is portable, connects to my Droid with no problem, and more then gets the job done. And I can use the buttons on the 505 to pause, foward and replay tracks with no problems.

Neil
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Old December 19th, 2009, 12:16 PM   #20 (permalink)
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Bluetooth is probably your best bet to get streaming audio...or use a 3.5 jack to the audio in.
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Old December 19th, 2009, 01:52 PM   #21 (permalink)
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I use my Garmin 785T for audio books and my old phone would play music with bluetooth, but the garmin will only connect phone audio to the 'droid, I contacted Garmin and the won't do anything since the phone is newer than the Garmin, they couldn't have anticipated. I've read that the 'droid support a2dp and the garmin spec says "with a2dp techonolgy" what are the chances of getting this to work from the android end?
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Old December 20th, 2009, 12:45 PM   #22 (permalink)
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Long post ahead, Cliff notes:
Droid should be capable of analog audio in/out over the data port.
MicroUSB port is a CEA-936-A Compliant car kit port.
I have done some testing and have not been successful.
There are MicroUSB to 3.5mm plugs on the market that supposedly work for the droid but i have not seen any posts saying whether or not they do work nor have i gotten ahold of one for myself.

I signed up just for this. I have the same exact desire and did not want to settle on using bluetooth or pluging in the headphone jack. I did some research and found that the droid can do audio over usb, at least it is in the design. The micro USB plug was designed into the phone to be a OTG CEA936-A compliant plug. What that means is that it must do what we want it to.

The microUSB plug has a 5th pin that is not standard to the regular USB plug. the 5th pin is an ID pin. The droid uses it to tell what mode its data port is being used in. Supposedly, there are 3 modes - USB, UART and Analog. A resistor from the ID pin to ground on the cable side is what tells the phone what mode the data port is in.

In the analog mode, the D+ Pin becomes a microphone input and right speaker output and is switched by the phone (ie, the D+ pin is a microphone input when in a call and is right speaker output when not in a call). The D- pin becomes the left speaker output, regaurdless of whether you are in a call or not. The ground pin is used for the speaker and microphone negative connections.

i opened up my "multimedia" dock (what a joke) and spliced into the cable in there. i used a prototype board so i could easily change resistor values and then hooked up the D- and Ground pins to a volt meter to see if i could get some audio out of the usb port with different resistor values.

so far, i have had no success. i believe the key to cracking this is in the resistor value needed, so far, all i have tested is a 200kOhm and 400kOhm (actual resistances were 220k and 440k, go 10% quality resistors!)

if anybody has found a copy of the CEA-936-A specification book, it should have the appropriate resistor values needed to get the analog mode for the droid. from there, i would need to test to see if you can charge while in Analog mode, as that would be a final criteria needed for my project to be complete.

I found a MicroUSB to 3.5mm adapter on ebay but i havent seen any report whether or not it works on the droid. i need to make a radio shack run today anyways, so i will have to see if i can find one and report back what i find.
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Old December 20th, 2009, 04:19 PM   #23 (permalink)
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I've done some more testing. I wasnt able to find a micro usb to 3.5, but i found a mini usb to 2.5, which is the same thing with different plugs. I wired it up according to how it should work, and wasnt able to get any sound out of the speaker i had wired to the usb. So this experiment was pretty much a bust. I am starting to wonder if maybe they coded the functionality out of it with software.
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Old December 31st, 2009, 12:50 PM   #24 (permalink)
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I really hope someone is able to get this figured out. I had hopes of outputting google nav turn by turn and pandora to my car speakers. I previously had a Motorola Q which also has a micro usb port and I had purchased a usb micro to stereo mini (3.5) adapter by Motorola and it worked fine on the Q. It doesn't seem to work at all on my Motorola Droid. Seems like all the components are there but maybe Google needs to add this functionality via software...who knows.

Soop
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Old December 31st, 2009, 01:10 PM   #25 (permalink)
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Quote:
Originally Posted by Soopernova View Post
I really hope someone is able to get this figured out. I had hopes of outputting google nav turn by turn and pandora to my car speakers. I previously had a Motorola Q which also has a micro usb port and I had purchased a usb micro to stereo mini (3.5) adapter by Motorola and it worked fine on the Q. It doesn't seem to work at all on my Motorola Droid. Seems like all the components are there but maybe Google needs to add this functionality via software...who knows.

Soop
Get an FM transmitter or bluetooth if your car has it
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Old December 31st, 2009, 01:52 PM   #26 (permalink)
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Originally Posted by gwlaw99 View Post
Get an FM transmitter or bluetooth if your car has it
while i have considered that route, fm transmitter still requires you to plug something else in, and most bluetooth transmitters are expensive. bluetooth and fm transmitters also suffer from quality loss.

i've pretty much concluded that it was coded out of the software, or never coded in. im hoping google will make the necessary changes to enable audio over micro usb, or else i am forced to just use a hard line to the stereo jack.
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Old December 31st, 2009, 02:06 PM   #27 (permalink)
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Phones with usb audio out just have the audio circuit wired to the usb port. It has nothing to do with software, it's 100% hardware. The Droid doesn't have the hardware capability.
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Old December 31st, 2009, 03:16 PM   #28 (permalink)
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Originally Posted by barry99705 View Post
Phones with usb audio out just have the audio circuit wired to the usb port. It has nothing to do with software, it's 100% hardware. The Droid doesn't have the hardware capability.
you are wrong. the phone uses the id pin to tell what mode it is in. a different resistor on the pin means different modes. there is a USB mode, a UART mode and an Analog mode. If the phone isnt programed to recognize the different modes, it wont work. phones that dont have an external headset jack are programmed to switch between USB mode and Analog mode.
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Old January 4th, 2010, 01:59 PM   #29 (permalink)
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This data sheet has a chart of the relevant ID resistor values and their functions:
http://media.digikey.com/PDF/Data%20Sheets/ST%20Microelectronics%20PDFS/ISP1302.pdf
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Old January 4th, 2010, 07:34 PM   #30 (permalink)
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Quote:
Originally Posted by tehstup View Post
Long post ahead, Cliff notes:
Droid should be capable of analog audio in/out over the data port.
MicroUSB port is a CEA-936-A Compliant car kit port.
I have done some testing and have not been successful.
There are MicroUSB to 3.5mm plugs on the market that supposedly work for the droid but i have not seen any posts saying whether or not they do work nor have i gotten ahold of one for myself.

I signed up just for this. I have the same exact desire and did not want to settle on using bluetooth or pluging in the headphone jack. I did some research and found that the droid can do audio over usb, at least it is in the design. The micro USB plug was designed into the phone to be a OTG CEA936-A compliant plug. What that means is that it must do what we want it to.

The microUSB plug has a 5th pin that is not standard to the regular USB plug. the 5th pin is an ID pin. The droid uses it to tell what mode its data port is being used in. Supposedly, there are 3 modes - USB, UART and Analog. A resistor from the ID pin to ground on the cable side is what tells the phone what mode the data port is in.

In the analog mode, the D+ Pin becomes a microphone input and right speaker output and is switched by the phone (ie, the D+ pin is a microphone input when in a call and is right speaker output when not in a call). The D- pin becomes the left speaker output, regaurdless of whether you are in a call or not. The ground pin is used for the speaker and microphone negative connections.

i opened up my "multimedia" dock (what a joke) and spliced into the cable in there. i used a prototype board so i could easily change resistor values and then hooked up the D- and Ground pins to a volt meter to see if i could get some audio out of the usb port with different resistor values.

so far, i have had no success. i believe the key to cracking this is in the resistor value needed, so far, all i have tested is a 200kOhm and 400kOhm (actual resistances were 220k and 440k, go 10% quality resistors!)

if anybody has found a copy of the CEA-936-A specification book, it should have the appropriate resistor values needed to get the analog mode for the droid. from there, i would need to test to see if you can charge while in Analog mode, as that would be a final criteria needed for my project to be complete.

I found a MicroUSB to 3.5mm adapter on ebay but i havent seen any report whether or not it works on the droid. i need to make a radio shack run today anyways, so i will have to see if i can find one and report back what i find.
I found this on Wikipedia:
____________________________
OTG Micro Plugs
The USB On-The-Go standard introduces a new plug receptacle called Micro-AB. It can accept either a Micro-A plug or a Micro-B plug. Micro-A Adapters allow for connection to Standard-A plug type USB cables, as used on standard USB 2.0 Devices. An OTG product must have a single Micro-AB receptacle and no other USB receptacles.[6][7]
The OTG cable has a micro-A plug on one side, and a micro-B plug on the other (it cannot have two plugs of the same type). OTG adds a fifth pin to the standard USB connector, called the ID-pin; the micro-A plug has the ID pin grounded, while the ID in the micro-B plug is floating. The device that has a micro-A plugged in becomes an OTG A-device, and the one that has micro-B plugged becomes a B-device (see above). The type of the plug inserted is detected by the state of the pin ID .
Three additional ID pin states are defined[6] at the nominal resistance values of 124 kO, 68 kO, and 36.5 kO. These permit the device to work with a USB Accessory Charger Adapter which allows the OTG device to be attached to both a charger and another device simultaneously.[8] These three states are used in the cases of:
A charger and either no device or an A-device that is not asserting VBUS (not providing power) are attached. The OTG device is allowed to charge and initiate SRP but not connect.[8]
A charger and an A-device that is asserting VBUS (is providing power) are attached. The OTG device is allowed to charge and connect but not initiate SRP.[8]
A charger and a B-device are attached. The OTG device is allowed to charge and enter host mode.
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Old January 4th, 2010, 08:36 PM   #31 (permalink)
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? i don't get any of this, lol.
but I plug my droid to my home theather system and listen to pandora all day long.
through the earphone outlets I know that some cars have the earphone outlet.
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Old January 5th, 2010, 04:01 AM   #32 (permalink)
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I would settle for a clean charging cable hack for the car dock. Anyone seen one? I have an overhead console in my vehicle with a display, so a 12V source is available in the vicinity. I want a clean way to go from that 12V down to the micro usb 5V we need to charge....
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Old January 30th, 2010, 01:56 PM   #33 (permalink)
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Lightbulb jumping ahead... is digital audio via usb possible?

i'm sorry if this is obvious, but is there any possibility to get digital audio out of the usb port?

i'd love to stream it to an external D/A converter.

thanks.

-wurf

Quote:
Originally Posted by tehstup View Post
you are wrong. the phone uses the id pin to tell what mode it is in. a different resistor on the pin means different modes. there is a USB mode, a UART mode and an Analog mode. If the phone isnt programed to recognize the different modes, it wont work. phones that dont have an external headset jack are programmed to switch between USB mode and Analog mode.
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Old February 5th, 2010, 04:40 PM   #34 (permalink)
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Quote:
Originally Posted by wurf View Post
i'm sorry if this is obvious, but is there any possibility to get digital audio out of the usb port?

i'd love to stream it to an external D/A converter.

thanks.

-wurf
Not obvious at all..........and it's exactly what I am looking for, too! Using USB to send just audio bits would allow users to bypass all internal Droid audio chips and processing.

I think the design of this software could be similar to Asio for the pc, but I'm sure there are other USB streaming options.
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Old February 9th, 2010, 12:16 PM   #35 (permalink)
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Default Anyone see one of these for the Motorola Droid

HTC Multifunction Audio Adapter for HTC Hero / Sprint Hero / T-Mobile myTouch 3G, myTouch 3G Fender / Verizon HTC Droid Eris

HTC Multifunction Audio Adapter for HTC Hero / Sprint Hero / T-Mobile myTouch 3G, myTouch 3G Fender / Verizon HTC Droid Eris - Phandroid Store
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Old February 9th, 2010, 03:54 PM   #36 (permalink)
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Quote:
Originally Posted by tehstup View Post
you are wrong. the phone uses the id pin to tell what mode it is in. a different resistor on the pin means different modes. there is a USB mode, a UART mode and an Analog mode. If the phone isnt programed to recognize the different modes, it wont work. phones that dont have an external headset jack are programmed to switch between USB mode and Analog mode.
I know how usb otg works, I'm saying the Droid's usb port isn't wired for sound! There has to be a circuit between the audio dac and the usb port. The only phones with that capability are the ones without a real headphone jack.
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Old February 9th, 2010, 07:43 PM   #37 (permalink)
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ok i am going to buy the audio adapter from the link i found one for 11.00 just googled droid usb audio and found one for 7 and 4 to ship i will try it out and let you know. i think this could possibly work but might need some software to push audio to usb. I use to do the same thing with the omnia.
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Old September 2nd, 2010, 10:12 AM   #38 (permalink)
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Default Imma try and make this happen

Just found this thread, I'd totally love this functionality too. I have experience in writing drivers, maybe I'll take a crack at some kind of USB Digital Audio driver for Android. If anyone else is trying, PM me and perhaps we can set up a github or something and collaborate. Advice and research are also welcome.
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Old September 2nd, 2010, 10:57 AM   #39 (permalink)
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Is there really a big difference in sound quality if you use bluetooth?

I'm considering buying a Droid 2 car dock because it has a built-in usb plug - no need to manually plug it in anymore. For audio, I would like to use bluetooth since that eliminates a wire. And finally, I can use tasker to detect that the droid is in the dock and automatically fire up the bluetooth, pair with the car, and load up the media player.

That all sounds great, but if bluetooth audio is sub-par, I'll have to go back to the headphone jack.
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Old September 4th, 2010, 08:55 AM   #40 (permalink)
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i have the motorola bluetooth 505 (i think) stereo headphones and they are awesome for music and video play back. I was watching a movie one night on the Droid and it's like having a mini surround sound setup.. I also use them for my PS3 online gaming for voice chat.
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Old February 10th, 2011, 07:59 PM   #41 (permalink)
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Default Car dock

If we get a car dock with a usb and a hdmi plug on it it seems like we could get the cable here 1.5m High Speed Mini HDMI to 5 RCA Audio/Video AV Cable (Black) 1.5m High Speed Mini HDMI to 5 RCA Audio/Video AV Cable (Black) : ShopXter.com, - Your Biggest Electronics Gadget Store. Best on Price, Good Quality and Large Selection Of Products! Worl and plug it into a head unit that has rca input and then get a car charger for are power to the battery.
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Old February 11th, 2011, 01:21 PM   #42 (permalink)
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The cable isn't the problem. Read above -- the Droid does not support audio via USB.
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Old March 2nd, 2011, 04:14 PM   #43 (permalink)
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Originally Posted by qoncept View Post
And finally, I'd considered making an app that spoofs an iPod, since my HU has iPod controls, but that's more work than it's worth when the Android music player's controls are just as good.
BAM...

Bluetooth Rec?eiver for iPod iPhone 3G Docking Speaker - eBay (item 190402178083 end time Mar-29-11 21:43:50 PDT)

That should work with any phone with A2DP functionality, and it should allow use of your ipod controls on your HU through the bluetooth AVRCP profile.

As for quality, from what I've used personally, BT audio can sound pretty good IF the BT reciever can handle the higher quality codecs (i.e MP4, AAC...).

Bluetooth profile - Wikipedia, the free encyclopedia

I think the biggest limitation is bandwidth, since the max throughput of BT 2.0 is 1.4 Mb/s. Unfortunately, it looks like that BT reciever only handles "SBC & MP3 codec".

Bluetooth - Wikipedia, the free encyclopedia
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Old May 11th, 2011, 03:32 PM   #44 (permalink)
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If the micro HDMI can handle sound/picture, would it be possible to splice a micro hdmi to a 3.5 mm aux cable?
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Old May 11th, 2011, 03:38 PM   #45 (permalink)
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Quote:
Originally Posted by marksa17 View Post
If the micro HDMI can handle sound/picture, would it be possible to splice a micro hdmi to a 3.5 mm aux cable?
Well, you asked this question in a "Droid" forum, which the Motorola Droid does not have an HDMI port, the Droid X does. And as for your question, I believe you would have to go through a Digital (HDMI) to Analog converter to get the left and right channels seperated into seperate wiring.
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Old May 14th, 2011, 11:01 AM   #46 (permalink)
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getting ready to upgrade both car audios to some very nice kenwood systems... this lack of (very slick) iphone interface is a major bummer for android owners. seems the industry is not moving at all to support android - my contract is up in november - is it time to throw in the towel and move to the dark side?
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Old December 31st, 2011, 11:44 PM   #47 (permalink)
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Default Android OS can't redirect system audio over usb

Hello, I've also been looking into this, thought I'd register so I can share what I found.

This might be the definitive answer:

I found this link after searching around for a while: http://stackoverflow.com/questions/8650967/audio-over-micro-usb-android-open-accessory
Quote:
The Android Open Accessory library provides a basic communication channel with devices via USB. What you do with it is up to you.
(It doesn't have any inherent support for audio, and you can't route the system audio over it. But you could write code which outputs a custom audio channel from your app.)
Keep in mind that the Open Accessory library uses a custom protocol, so won't work with things such as a standard USB DAC.
(For that, you'd want to use the USB Host mode APIs: http://developer.android.com/guide/topics/usb/host.html. The same caveats about not being able to route the system audio still apply.)
So: as I read that, it might be possible to make some custom apps that can send certain audio over a USB port to a compatible USB-equipped device. However, since it doesn't use the "analog" feature of the microUSB standard, you can't just solder some headphones to the pins of the USB connector. You'll need some electronics on the other end to receive the USB messages, strip out the digital data, then put it through a D/A converter and amp to get to your ears. The end product would look something like http://www.amazon.com/Motorola-Stereo-SYN1458A-Headset-micro-USB/dp/B001EJL1UE , but you couldn't use this because the protocol android is building into their USB support is probably different, but I don't know anything about it.

So, if all that is true, you'd need to make custom Pandora or YouTube apps that send the digital audio to the USB port, then have your custom/prorammable usb-equipped headset receive and decode it. Not impossible, but a bit of a project.
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Old January 14th, 2012, 01:48 AM   #48 (permalink)
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Android/Linux USB audio driver compliant with FiiO USB DAC E7:
"The FiiO E7 Headphone Amplifier is an USB DAC dedicated to high fidelity headphone.
It works out of the box with my Ubuntu 11.04. I just plug it when I need it and several seconds later it appears in my output sound devices list."
FiiO E7 Headphone Amplifier (Audio Devices) - Linux Hardware Compatibility List

"Buried in this thread is another person who successfully used his Beresford Caiman USB DAC on an Android tablet using USB Host. It's pretty easy to get working, all you need is an Android device with CyanogenMod7 support and USB HOST enabled. You need a powered hub for it to work though."
USB headphone AMP with Android Phones, possible ???


USB Audio Driver for ALSA "usbaudio.o" is likely missing in the current stock kernel of Android 4.0.3.


"Usbaudio.o" is present in the mod kernel of the Nook tablet which allows FiiO USB DAC E7 & Nook to interoperate:
https://github.com/dalingrin/nook_kernel/tree/encore-32/sound/usb
[webcam support] USB Host support that YOU can try (now in nightlies) - xda-developers
xda-developers - View Single Post - [webcam support] USB Host support that YOU can try (now in nightlies)

"Usbaudio.o" is likely not present in the 4.0 kernel and FiiO USB DAC E7 doesn’t interwork with Google Galaxy Nexus:
https://bitbucket.org/paulobrien/android_kernel_galaxynexus/src/bc4f9b72a51d/sound/usb
Samsung galaxy nexus


For the time being, Google is not aware of the USB DAC market, and the USB DAC manufacturers do not know the Android devices, likely the predominant computer systems in the (near) future.

Likely, Google architects are aware that computer systems should be compliant with standard computer interfaces like USB:
USB Host and Accessory | Android Developers

And, likely it's not the case with some Google program managers:
. USB Host feature not activated in Android 4.0.0
. no support of USB Audio in Android 4.0.3.
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Old January 17th, 2012, 04:39 PM   #49 (permalink)
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Angry Car Dock

First of all let me say I'm extremely disappointed with my new Android phone and tablet. I bought the new Samsung Galaxy S 2 Skyrocket (for starters that name is ******ed). Andriod, and thus Google needs to understand that the experience of using a smart phone is much more than what the phone will do. It is what the phone will do with accessories. I dumped my iPhone 4S because I must have 4G data. Now I learn there are virtually no accessories available for this phone.

As far as a car dock what you want is a ProClipUsa custom mount. ProClipUsa is the gold standard for car docks. You put in your model, year, and make of car and they have a custom made part to attach to your dash (usually two or three options) without any glue or screws (and thus it will leave no marks when you remove it). Then you buy the custom dock for you model of phone. For most people this will work.

I just learn however, that this will not work for me because my 2012 Hyundai Sonata has a proprietary USB cable (which actually has two jacks connect as one) and that they sell those cables for iPhones but not for Andriod phones.

Google has something like $50 Billion in cash sitting around. If Google is serious about making a play in the smart phone market Google needs to do what it takes to insure that accessories will be available. Perhaps if Google bought a company like Logitech and made accessories for everything not Apple products.
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Old January 22nd, 2012, 12:33 PM   #50 (permalink)
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Efforts are ongoing to enable the USB audio feature in a modded Android/Linux kernel.

But if you want the USB audio enabled via official firmware/kernel, please vote (i.e. request to Google) here:
Issue 24614 - android - Enable USB audio on the Galaxy Nexus (or any Android 4.0 device) - Android - An Open Handset Alliance Project - Google Project Hosting
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