I've had excellent experience with pioneer and kenwood units that implement techniques to fall back on FM signal when the DAB coverage of a particular station is intermittent. They seem to use algorithms to time-align and perform volume matching on both signals, along with some buffering that allows them to perfectly switch to FM signal when the DAB service would otherwise cut out.
I am wondering if there's a combination of hard- and software that manages a similar solution that can be employed on MTCD units.
I think the DAB and FM have to be on the same chip for this and its only the non usb type DAB box for MTCB/D units that has an FM/DAB chip, it does support station following but I dont think its implemented.
Some one would have to mod the app to get it to work. theoretically you could write something to switch to the FM signal of the radio app if you have the usb DAB device.
Both Signals need o be fed to a Buffer.
Yes both dab fm or two dab signals are also possible.
Now audio signals need to be compared. This leeds to delay match which can the be used to align audio Volume and Frequency response. Regards Greg
Related
I replaced my motherboard recently the original was a kld1 and radio reception was poor.
I have improved reception for the kld2 v2..67, however in comparison to the factory fitted car stereo it looses reception and loc does not work. As I drive to work (30 miles) and it is annoying that I loose reception and have to manually find another frequency.
I have the factory mcu and the unit is a witson unit and I have tested that the amplified power output works.
I see some hardware mods, I would prefer a working software mcu/rom combination that worked.
If your car has an amplified antenna from the factory, you may need to add a power injector to allow it to work properly. The factory head unit could have provided power to the antenna, and these Android units do not.
Thanks. I am using this below which I takes power from switched blue/white cable in my car. This pushes 12V from the car to the aerial bypassing the need for android input.
Am I the only one with poor radio reception/loc not working?
http://www.suzuki-forums.com/attachments/2g-2006-vitara-grand-vitara/49441d1431649159-replacement-radio-aerial-issue-ct27aa50_suzuki_swift_aerial_adapter_din_female-1-.jpg
dazza007 said:
I loose reception and have to manually find another frequency.
I have the factory mcu and the unit is a witson unit and I have tested that the amplified power output works.
I see some hardware mods, I would prefer a working software mcu/rom combination that worked.
Click to expand...
Click to collapse
"Alternative frequency" (AF) function doesn't work in these HU, and it's a well known problem.
It's not a matter of a poor antenna signal, but a software (if not hardware) bug.
Attempts are being carried on by some developers to find a solution (modding the radio app), but unfortunately until now without success.
themissionimpossible said:
"Alternative frequency" (AF) function doesn't work in these HU, and it's a well known problem.
It's not a matter of a poor antenna signal, but a software (if not hardware) bug.
Attempts are being carried on by some developers to find a solution (modding the radio app), but unfortunately until now without success.
Click to expand...
Click to collapse
I did assume that this was the case. Thank you for confirming this.
Hi, I recently installed an MTCD px3 unit in my car but the audio quality is not that great. I'm looking at the option of a USB DAC but that appears to have its own set of issues and complexity.
I do note though that the RK3188 chip includes an SPDIF function and this does appear as an audio device in /proc/asound/cards so if the pins (balls) are exposed somewhere on the px3 module board then it should be just a matter of soldering to the right points to create an SPDIF interface.
If someone has a totally bricked unit would you consider doing some research? I.e. using some heat to the remove the RK3188 BGA chip and locating the ball that relates to SPDIF and seeing if it can be traced to a track?
The SPDIF transmitter is located at ball N20. You can find the datasheet by googling "RK3188 Datasheet" (sorry I can't post links yet). So who can "expose the balls"?
Alternatively if someone has a dead board/unit they would give away, I'd be happy to pay shipping for you to send it to me (in New Zealand) and I'll do the research and share my findings with the community.
Also looking for someone who understands what would be required on the software side of things to actually use the interface. Some kind of ALSA magic I guess?
Note - I do understand the limitation. I.e. this only applies to audio within Android, not the radio or bluetooth etc. My approach would be to install a physical switch so I could switch my car amp between the analog and digital outputs.
mcraenz said:
Hi, I recently installed an MTCD px3 unit in my car but the audio quality is not that great. I'm looking at the option of a USB DAC but that appears to have its own set of issues and complexity.
I do note though that the RK3188 chip includes an SPDIF function and this does appear as an audio device in /proc/asound/cards so if the pins (balls) are exposed somewhere on the px3 module board then it should be just a matter of soldering to the right points to create an SPDIF interface.
If someone has a totally bricked unit would you consider doing some research? I.e. using some heat to the remove the RK3188 BGA chip and locating the ball that relates to SPDIF and seeing if it can be traced to a track?
The SPDIF transmitter is located at ball N20. You can find the datasheet by googling "RK3188 Datasheet" (sorry I can't post links yet). So who can "expose the balls"?
Alternatively if someone has a dead board/unit they would give away, I'd be happy to pay shipping for you to send it to me (in New Zealand) and I'll do the research and share my findings with the community.
Also looking for someone who understands what would be required on the software side of things to actually use the interface. Some kind of ALSA magic I guess?
Note - I do understand the limitation. I.e. this only applies to audio within Android, not the radio or bluetooth etc. My approach would be to install a physical switch so I could switch my car amp between the analog and digital outputs.
Click to expand...
Click to collapse
Hi.. my Android Radio just recently crashed. If you like.. i can give it to you.
Its a Hot Audio Android Radio PX3 RK3188.
Thanks very much. I've sent a PM.
Cheers,
Rhys
do you located SPDIF transmitter? Is possibile to connect directly an external DSP such Audison P8.9?
Bump
Hi,
Can anyone confirm if MTCD PX5/PX6 devices support VSS (Vehicle speed sense) without a canbus? One of my cars don't use canbus, but it does control audio volume depending on the speed. It is a convertible car and it works in the way that as soon as the roof is folded it activates the switch and audio volume increases. One of my old aftermarket head units had a "Speed+" pin on the connector and it workd out of the box however I am seeing that these new Rockchip devices for example Dasaita units don't have that wire anywhere in the harness but perhaps it is not activated on the main board?
mariof said:
Hi,
Can anyone confirm if MTCD PX5/PX6 devices support VSS (Vehicle speed sense) without a canbus? One of my cars don't use canbus, but it does control audio volume depending on the speed. It is a convertible car and it works in the way that as soon as the roof is folded it activates the switch and audio volume increases. One of my old aftermarket head units had a "Speed+" pin on the connector and it workd out of the box however I am seeing that these new Rockchip devices for example Dasaita units don't have that wire anywhere in the harness but perhaps it is not activated on the main board?
Click to expand...
Click to collapse
Doesn't need vehicle speed sense input as it has GPS.
Modded ROMs, launchers and xposed mods provide this function (vehicle speed dependant volume control) via GPS.
Hey Everyone,
Quick question for the more experienced Android HU installers.
In one of my vehicles I have a Dasaita Max6 android head unit and love it so I'd like to get one for my other car.
Unfortunately though, I have an older car with an oldschool antenna that goes up and down. However, with my aftermarket cd player in there now, whenever it powers on my antenna goes up. This is actually a problem going through car washes etc.
My goal is to have the antenna go up only when I open the FM radio app on an android head unit, instead of going up when using say, navigation or bluetooth.
Are there any head units that have a 12v output only when the radio app is launched?
Ultimately, I might just put a switch on the dash to control the antenna motor instead, but I thought I'd check here first.
Thanks!
No, you can't assign an app to the power antenna lead. It sure would be a neat idea, but the antenna lead is not software driven and there is no way to make it that way. It's purely hardware driven.
A switch on the dash, or just turning the head unit off is your only answer.
Hi,
I bought a XTRONS TA708PIL about 2 years ago and i've had issues with the signal quality of FM radio stations and DAB+ pretty much since owning the head unit.
I purchased a Eightwood 12v antenna which worked with the DAB+ USB using DAB-Z for a couple of months then the quality seemed to degrade again.
Recently updated the DAB-Z app and found that signal quality has improved on some stations that didn't really suffer with signal issues seem to have started in certain parts of my regular journey to work.
FM only works when car is stationary. Updated to NavRadio as I read this was the better app to use but still issues.
The antenna is grounded to the body and the 12v supplied connecting to the fuse box.
Android 8.1
andy25hill said:
Hi,
I bought a XTRONS TA708PIL about 2 years ago and i've had issues with the signal quality of FM radio stations and DAB+ pretty much since owning the head unit.
I purchased a Eightwood 12v antenna which worked with the DAB+ USB using DAB-Z for a couple of months then the quality seemed to degrade again.
Recently updated the DAB-Z app and found that signal quality has improved on some stations that didn't really suffer with signal issues seem to have started in certain parts of my regular journey to work.
FM only works when car is stationary. Updated to NavRadio as I read this was the better app to use but still issues.
The antenna is grounded to the body and the 12v supplied connecting to the fuse box.
Android 8.1
Click to expand...
Click to collapse
Hi, I have a similar set up and I have the same issue, I have thought of changing the roof antenna, then my neighbour said she was having same problem in her car with everything all built in. I have a Amateur radio licence, the fist thing I was taught, you can have the best receiver in the world but if you dont have the right antenna to match, my thoughts are a better roof antenna, so I think I will try that first. There are areas where the digital signal can be interrupted. Weather to and built up areas. Just my thoughts, good luck, Bill