Old Q&A-Thread - This Thread will be split into multiple KB-Thread soon

halloj · Oct 27, 2015

Blaze Falconburger said:
It didn't come off cleanly so I can't reconnect it - could I just bridge it?

That could cause problems, again I believe its function is to block DC supplied to the internal mic. Can't you just get whatever cap with connecting pins and bridged it.
Go for a 0,01 micro-farad or something similar.

mimpoca · Oct 27, 2015

p_mike83 said:
hello everyone

i am looking to find a way to have TTS voice guidance to work over radio all audio.
There is a app, that allow to stop/lower volume of other streams when the TTS engine makes an announcement. I think this works only with apps using STREAM_MUSIC as the streaming channel.

I Tried it with spotify and the mtcradio app.
with spotify it works, eg the audio stream gets quite/lower so that the TTS announcement ist clearly audible, and continues after the announcement, with the mtcradio app it doesn't work, neither while listening to mp3 on a dvd. ( the announcement is made on top of the audio stream, so that its not clear).

does anyone now which Stream is used from the mtc apps ? is it possible to redirect this stream to STREAM_MUSIC or modify those apps to use this without problems?

Either nobody really knows this or nobody wants to tell. I've asked a few times myself with no reply. As it looks to me, the culprit is the stock radio app, which seems to raise the volume (I don't know which stream - I am just trying to describe the symptoms), so that all other sounds are lower. This makes it nearly impossible to hear the navigation TTS. If you exit the radio app, all sounds are suddenly much louder. I was trying to play with the different audio streams, but could not find a solution. Then I tried to find a different radio app that works on our devices, but I could not find any. Now, until a miracle happens, I am using only streaming radio, and all audio issues are resolved...at the expense of a very high data usage. I am not giving up though...

7floor · Oct 27, 2015

mimpoca said:
Either nobody really knows this or nobody wants to tell. I've asked a few times myself with no reply. As it looks to me, the culprit is the stock radio app, which seems to raise the volume (I don't know which stream - I am just trying to describe the symptoms), so that all other sounds are lower. This makes it nearly impossible to hear the navigation TTS. If you exit the radio app, all sounds are suddenly much louder. I was trying to play with the different audio streams, but could not find a solution. Then I tried to find a different radio app that works on our devices, but I could not find any. Now, until a miracle happens, I am using only streaming radio, and all audio issues are resolved...at the expense of a very high data usage. I am not giving up though...

Radio doesn't have any streams in Android. It's sound does not get into Android at all, being passed from the Radio module directly to the hardware audio input switch/processor and then to the outputs.
So you are not able to control its volume with any standard android app.
As to why exiting radio makes other sounds louder - try examining the datasheet for the audio processor (google for "BD37534FV datasheet").
The hint: when Radio plays, it comes thru one of the main inputs and the Android system plays thru the MONO MIX input; when you exit Radio app, the Android system sounds thru one of the (other than radio) main inputs.
And what is the problem with navigation TTS? What is that you call "navigation TTS"? May be I can help if I uderstand your trouble better.

TOMMYX2 · Oct 27, 2015

mimpoca said:
Either nobody really knows this or nobody wants to tell. I've asked a few times myself with no reply. As it looks to me, the culprit is the stock radio app, which seems to raise the volume (I don't know which stream - I am just trying to describe the symptoms), so that all other sounds are lower. This makes it nearly impossible to hear the navigation TTS. If you exit the radio app, all sounds are suddenly much louder. I was trying to play with the different audio streams, but could not find a solution. Then I tried to find a different radio app that works on our devices, but I could not find any. Now, until a miracle happens, I am using only streaming radio, and all audio issues are resolved...at the expense of a very high data usage. I am not giving up though...

i have a Hawei Lte Stick and hear only Online Radio Streams (Tunenin,Xialive) without any problems.

if I do not complete close the MTC Radio app and starts Poweramp or another radio app,then I hear the sound only from one Speaker.
But If i close the MTC Radio app with the BACK button,and start Poweramp etc... is with my sound everything ok.
With my old AN21 -U I did not have this strange problem.

mimpoca · Oct 27, 2015

p_mike83 said:
hello everyone

i am looking to find a way to have TTS voice guidance to work over radio all audio.
There is a app, that allow to stop/lower volume of other streams when the TTS engine makes an announcement. I think this works only with apps using STREAM_MUSIC as the streaming channel.

I Tried it with spotify and the mtcradio app.
with spotify it works, eg the audio stream gets quite/lower so that the TTS announcement ist clearly audible, and continues after the announcement, with the mtcradio app it doesn't work, neither while listening to mp3 on a dvd. ( the announcement is made on top of the audio stream, so that its not clear).

does anyone now which Stream is used from the mtc apps ? is it possible to redirect this stream to STREAM_MUSIC or modify those apps to use this without problems?

7floor said:
Radio doesn't have any streams in Android. It's sound does not get into Android at all, being passed from the Radio module directly to the hardware audio input switch/processor and then to the outputs.
So you are not able to control its volume with any standard android app.
As to why exiting radio makes other sounds louder - try examining the datasheet for the audio processor (google for "BD37534FV datasheet").
The hint: when Radio plays, it comes thru one of the main inputs and the Android system plays thru the MONO MIX input; when you exit Radio app, the Android system sounds thru one of the (other than radio) main inputs.
And what is the problem with navigation TTS? What is that you call "navigation TTS"? May be I can help if I uderstand your trouble better.

WOW, thank you for the explenation. This makes things a whole lot clearer.
The problem with the "navigation TTS" (Tomtom TTS voice) is that it can't be heard while the radio is playing. The radio is too loud or the rest of the sounds are too low. I changed the stream volumes in the factory settings to "20" for system, and "0" for radio, which makes it a little better, but the TTS voice is still too low to really understand. Again, as soon as I exit the radio app, everything else gets very loud.
So, it looks like the radio volume could only be controlled through a proprietary app that can control the audio processor. I wonder if I could write an app for this

dsa8310 · Oct 27, 2015

p_mike83 · Oct 27, 2015

7floor said:
Radio doesn't have any streams in Android. It's sound does not get into Android at all, being passed from the Radio module directly to the hardware audio input switch/processor and then to the outputs.
So you are not able to control its volume with any standard android app.
As to why exiting radio makes other sounds louder - try examining the datasheet for the audio processor (google for "BD37534FV datasheet").
The hint: when Radio plays, it comes thru one of the main inputs and the Android system plays thru the MONO MIX input; when you exit Radio app, the Android system sounds thru one of the (other than radio) main inputs.
And what is the problem with navigation TTS? What is that you call "navigation TTS"? May be I can help if I uderstand your trouble better.

The problem is when listening to radio/music etc and a navigation announcement is made, we expect that the music/radio volume lowers so that the navigation advice can be heard clearly. This happens when the navi app uses normal voices, but not when using TTS-voice (Text to speech)
The app soundabout allows the navi app to reduce/mute other android sounds when it makes an announcement, but this doesnt work with the mtc apps.
In the settings there is a menu to choose whether to mix or switch to the gps announcement, but that only work with non-TTS-voices.
i am thinking that if soundabout manages to mute other sounds when a TTS anouncement is made, and through the settings the radio app gets mute when a non-TTS announcement is made, there must be a way to fix the problem.
i tried modifying the radioapp to output the sound using the av channel sys, but then i couldnt listen anything, so i reinstalled the original app.

dsa8310 · Oct 27, 2015

7floor · Oct 27, 2015

p_mike83 said:
The problem is when listening to radio/music etc and a navigation announcement is made, we expect that the music/radio volume lowers so that the navigation advice can be heard clearly. This happens when the navi app uses normal voices, but not when using TTS-voice (Text to speech)
The app soundabout allows the navi app to reduce/mute other android sounds when it makes an announcement, but this doesnt work with the mtc apps.
In the settings there is a menu to choose whether to mix or switch to the gps announcement, but that only work with non-TTS-voices.

I see the problem. Funny thing is that my work (http://xdaforums.com/android-auto/android-head-units/mtc-sound-controlling-bd37xxx-sound-t3234660) will mute/lower Radio for navigation app regardless of the stream type. This software tries to mimic what the stock MCU does, but not ideally follows it - I don't consider the stream type. Only problem is that it needs a HW modification, which is not suitable for everybody.

p_mike83 said:
i tried modifying the radioapp to output the sound using the av channel sys, but then i couldnt listen anything, so i reinstalled the original app.

That's not the way. The radio SHOULD use "fm" channel, not the "sys" because this is exactly what makes the sound switch/processor to switch to the correct hardware input for the radio module.
Can you send me your navigation app's APK file? I guess it's TomTom? I can try to decompile it and see if it is possible to e.g. write an Xposed module to make it work thru the music stream instead of TTS, so that stock MTC's functionality will apply for it.

Blaze Falconburger · Oct 27, 2015

halloj said:
That could cause problems, again I believe its function is to block DC supplied to the internal mic. Can't you just get whatever cap with connecting pins and bridged it.
Go for a 0,01 micro-farad or something similar.

Tried bridging - internal mic still works, so looks like like it's an issue with external mic somehow. I'll try another mic when I can just to guarantee it isn't the mic and go from there. Frustrating!

---------- Post added at 09:35 PM ---------- Previous post was at 09:30 PM ----------

dsa8310 said:
I don't understand either why the external mic does not work with BT/handsfree. Is the central mic wire going to #4 and the shield, is it going to ground (#5)?

Now, since the internal mic has stopped working, you are in the very case described by @dnts originally:
C32 was a bridge, used to power the internal mic from the BT card. Once cut, you need to power the internal mic from the bias voltage supplied by the CODEC chip - as @dnts has done.

Restoring a bridge instead of C32 would power the internal mic as well. But then, there is no separation between the BT external mic and the internal one. However, it will tell you that indeed the internal mic was powered by the BT card (with the bias voltage).

Don't panic, proceed methodically.
Try to feed the bias voltage from the CODEC chip to the internal mic while C32 is still cut. If the internal mic works again, you have solved the Android part (e.g. Skype).

Then focus on the external mic & the BT card. Here I have no advice but to replace the external mic. You may temporarily use the internal mic for this purpose - because it's a valid mic (disconnect it entirely from its current internal role/location).

Good luck.

Thanks for this - I only did the first part of @dnts' post as I am only concerned with BT audio, not Android audio. I don't see the link between the requirement to the Android part just to get BT working. Bridging it allows the internal mic to work again - I'll try another external mic etc when I can get one. For now the unit is back in the car as I am driving a lot the next few days, so I'll revisit this in a week or so (wither another mic!)

Thanks for all your help @dsa8310 and @halloj

p_mike83 · Oct 27, 2015

7floor said:
I see the problem. Funny thing is that my work (http://xdaforums.com/android-auto/android-head-units/mtc-sound-controlling-bd37xxx-sound-t3234660) will mute/lower Radio for navigation app regardless of the stream type. This software tries to mimic what the stock MCU does, but not ideally follows it - I don't consider the stream type. Only problem is that it needs a HW modification, which is not suitable for everybody.

That's not the way. The radio SHOULD use "fm" channel, not the "sys" because this is exactly what makes the sound switch/processor to switch to the correct hardware input for the radio module.
Can you send me your navigation app's APK file? I guess it's TomTom? I can try to decompile it and see if it is possible to e.g. write an Xposed module to make it work thru the music stream instead of TTS, so that stock MTC's functionality will apply for it.

i thought that the non TTS-Voices are streamed as notifications (stream_notification). an xposed module to fix this would be great! the TTS voice announcement is made through the TTS engine though. you can choose the google one, or download one from the play store. only the soundabout engine allows the android apps to lower their volume respecting the navigation announcement. TT has its own TTS engine on board?

dsa8310 · Oct 27, 2015

mimpoca · Oct 27, 2015

7floor said:
I see the problem. Funny thing is that my work (http://xdaforums.com/android-auto/android-head-units/mtc-sound-controlling-bd37xxx-sound-t3234660) will mute/lower Radio for navigation app regardless of the stream type. This software tries to mimic what the stock MCU does, but not ideally follows it - I don't consider the stream type. Only problem is that it needs a HW modification, which is not suitable for everybody.

I had already read about your solution, and I find it very interesting

, but I am hesitant to do the HW mod. I would rather wait a little longer until a modified MCU may become available, so it would only be a software mod.

RyanBRZ · Oct 27, 2015

dsa8310 said:
Next to the MIC+ pin (#4) of the BT card there is a recommended SGND pin #5 to use for external mic's ground (do not use use pin #3 though it's SGND marked, too).
Avoid ground loops - use only one ground point (preferably pin #5 of the BT card).

I use a Parrot external mic: http://store.parrot.com/ie/parrot-s...hone-for-ck3000-evo-ck3100-3520410020841.html .

halloj said:
That mic is the ultimate one for car use. I'm using that one in two installations. Except for any problem
with that particular mic it's good. Dsa 8130 above has another input you might consider. On the other hand
your connector is grounded in the chassis if I understood you correct. The shield should than be left open in the BT end.

Is this mic mod applicable for all units in the family of units in this thread? I have a Klyde that I bought as an Eonon GA5167. I would really like to get a usable mic wired up.

pants001 · Oct 27, 2015

RyanBRZ said:
Is this mic mod applicable for all units in the family of units in this thread? I have a Klyde that I bought as an Eonon GA5167. I would really like to get a usable mic wired up.

With all this talk about using different mic's and the inbuilt one being rubbish, I am really surprised that the manufacturers haven't sorted this issue out.
We are talking about a known solution for around a year or more now!

Id gladly pay an extra $5 or $10 for proper Mic and Wifi

Cmon chinese, work on this ****

comptechltd · Oct 28, 2015

Malaysk said:
NEW from 27 October, 2015
Only for RK3066 800X480

Most global firmware update from me, perhaps a few months to 800X480.
Changes, updates, deletes, transfers, etc. lots of. I write about everything I will not. Here are just a couple:
+++ Android part of 10 October.
+++ New NEXT launcher - a slightly redesigned our radio me
+++ The new boot logo (the very first - that appears when you download a few seconds)
+++ Added gradient Status Bar (Settings - System)
+++ A new panel ext. programs and recently run (Settings - System)
+++ Added new tab in Preferences - Advanced Settings screen (think there will understand)
+++ Fixed program MTCBlueTooth - incorrectly displays the number of the incoming call
+++ Well, and so on. D.

Firmware I have not done a simple upgrade - erased all the data. Make a backup of your applications (System Settings then do by hand - not to restore from backup !!!)
HERE

@Malaysk,

Thank You for your great work!!! Does this release also have the standard launcher that you can switch to?

Steve

JEMShoe · Oct 28, 2015

DWilks said:
@JEMShoe JY unit 1024X600 Malaysk rom........here's my screen shot but I don't see any "Services". Perhaps an apk adds this to the Accessibility tab and I just don't have an apk that adds it....just guessing on that.

JEMShoe said:
I have been working on a lockscreen setup solution for our Android HUs; I have it working decently on my Nexus 7. However when I tried it on my JYHU it would not work due to missing 'Services' under Android Accessibility settings.
I sent a post yesterday (24-OCT-2015) requesting ***ANYBODY*** please just "...check under Settings->Accessibility and tell me what sub-sections there are (i.e. SERVICES, SYSTEM)?".
Everyone has Settings on their units; It only takes a few minutes to check and reply (and maybe post a screenshot of your accessability menu).

Help me and I can help everyone else.

FYI, here is a picture of my Settings screen on my 2013 Nexus 7 running Android 4.4.4. Any app I install can, if it needs to and I accept it to, insert an entry under Settings->Accessibility->Services. The Android OS on these HuiFei Android Head Units ~~appear to be~~ ARE giving us a crippled version version of Settings. I have asked Joying to fix this but no response. I am trying to fix it but I am an Android programming newbie. I am appealing to anyone with experience to help me repair this. There are apps that can improve the way this device behaves in the car if it can fully utilize the Settings->Accessibility->Services.

Malaysk · Oct 28, 2015

comptechltd said:
@Malaysk,

Thank You for your great work!!! Does this release also have the standard launcher that you can switch to?

Steve

Yes, now all my new firmware has TWO launcher, factory and Next. Default loaded factory launcher from JY

danat · Oct 28, 2015

mimpoca said:
Either nobody really knows this or nobody wants to tell. I've asked a few times myself with no reply. As it looks to me, the culprit is the stock radio app, which seems to raise the volume (I don't know which stream - I am just trying to describe the symptoms), so that all other sounds are lower. This makes it nearly impossible to hear the navigation TTS. If you exit the radio app, all sounds are suddenly much louder. I was trying to play with the different audio streams, but could not find a solution. Then I tried to find a different radio app that works on our devices, but I could not find any. Now, until a miracle happens, I am using only streaming radio, and all audio issues are resolved...at the expense of a very high data usage. I am not giving up though...

When I on my unit (RK3188 MTCB-KGL-V2.78) in "settings -> GPS -> GPS Application Options -> Vocalizer TSS" select in place off iGO, then when there is a TTS voice the radio is muted, I can even select if the radio-stream is completely muted or if the radio-stream volume is going down by x dB ( option in GPS settings "Switch or Mix"

7floor · Oct 28, 2015

danat said:
When I on my unit (RK3188 MTCB-KGL-V2.78) in "settings -> GPS -> GPS Application Options -> Vocalizer TSS" select in place off iGO, then when there is a TTS voice the radio is muted, I can even select if the radio-stream is completely muted or if the radio-stream volume is going down by x dB ( option in GPS settings "Switch or Mix"

This looks like a suggestion really worth consideration.

danat, can you clarify a few things to me as I'm not familiar with the iGO?
Vocalizer TTS is a 3rd-party TTS engine, so how the iGO speaks thru it, I mean can you choose which TTS to use when configuring iGo or it speaks thru system default engine and you have set Volalizer as a default?
How the iGO behaves if you don't have Vocalizer installed?

By the way, about my idea about Xposed plugin to hack and replace stream type of specific navigation programs - this is not going to work I believe.
I've just looked at the Android documentation, there's no such thing as TTS stream type, like music one, here's the full list:

STREAM_ALARM - The audio stream for alarms
STREAM_DTMF - The audio stream for DTMF Tones
STREAM_MUSIC - The audio stream for music playback
STREAM_NOTIFICATION - The audio stream for notifications
STREAM_RING - The audio stream for the phone ring
STREAM_SYSTEM - The audio stream for system sounds
STREAM_VOICE_CALL - The audio stream for phone calls

This proves that the problem is not with the some stream type being unsupported by the MTC's built-in sound level handling logic, rather this above danat's suggestions is correect one.

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