MTCD ROCKCHIP PX5 A53 DAC/USB Sound Issues and fixes - MTCD Android Head Units Q&A

I recently bought a DASAITA V600. I bought it mostly for high quality audio use. The only way to get high quality audio is to use a USB DAC with it and enjoy the music.
Everything works fine on the unit except USB audio. I am using UAPP and i am plagued with Jitter issue on anything above 16bit /44100 Hz
Apps which play music over internet don't output using USB DAC
DAC is a hifimediy 9018, i have also tried minidsp ministreamer but no difference. Both DACs support 24/96KHz
So far i have tried the below
Disabling 4 CPU in the octacore
Tried almost everything in UAPP but mostly got jitter, sometimes less and sometimes more.
Is there anything that can be done to get it working for other apps or play 24 bit 96000Hz correctly?

Related

USB Audio for TF700

Hi,
I've been looking for a solution to use a dedicated USB soundcard with my TF700, because the sound quality from the 3,5mm analog out isn't loud enough, the quality isn't great and I hear lots of intermittent "hiss" noises when I'm watching movies with DTS sound (whatever the video player I use).
The main problem is the loudness, since I'd like to use the tablet to watch videos i.e. in a plane.
I was thinking of an external USB soundcard like the Asus Xonar U1 or U3 to connect to the dock's USB, but I'd like to know if anyone has tried it before.
Preferably, I'd like something with a dedicated headphone amp.
I have a HiFimeDIY Sabre DAC that kind of works when I plug it in the dock, I hear sounds but with lots of popping and cracking.
Using the USB Audio Player I could make the tablet work correctly with the DAC, but that one only works for music, and their custom driver doesn't work with other apps.
Any help?
(sorry if I posted in the wrong section)
An update:
I went to a store and tried a Xonar U3 connected to a TF700+dock. Same thing as with the Sabre DAC I tried earlier.
Whenever I play something, the sound is "recognizable", but it's mostly made of popping and cracking.
It sounds the same as is I was used the Audio Player before applying the proper settings (force 1-bit, 16bit sampling, 4k buffer).
This seems to be a driver issue. I heard Samsung phones/tablets work flawlessly with most external USB DACs, so this is a real shame.
Why don't you get a Fiio amp?
projeto56 said:
Why don't you get a Fiio amp?
Click to expand...
Click to collapse
I have one and it works great with headphones & portable speakers
http://www.amazon.com/gp/product/B004QVPGXK/ref=wms_ohs_product?ie=UTF8&psc=1
sparksd said:
I have one and it works great with headphones & portable speakers
http://www.amazon.com/gp/product/B004QVPGXK/ref=wms_ohs_product?ie=UTF8&psc=1
Click to expand...
Click to collapse
What Rom?
dbaler said:
What Rom?
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Click to collapse
CROMBi-kk.

[Q] Slight static hiss/noise on 3.5mm jack

On my tablet I always get a slight static hiss/background noise during and a couple seconds after the tablet plays any sound.
This seems very odd to me since it's not affected by how loud the volume is (as long as sound is on, not at 0).
I don't have this on any other outputs (HDMI/BT/USB OTG/build-in speakers, all fine)
Every headset/speaker I use outputs this from cheapo Samsung in-ears to a quite expensive 2.1 setup.
I'm used to having a bit of noise at the highest volume levels (which for ex. my Note 3 has) and consider this normal.
But this is very annoying, especially when navigating the UI as I always have to endure this hiss for a couple of seconds.
I'm not sure if it's a hard or software issue, since normally static hiss always occured to me on lower-end devices with higher volume, and if it were a software issue should it not also do this on all outputs (including digital).
I haven't come across anyone with a similar issue.
Yep, this happens for me as well on my LTE version. It also happened on the Nexus 7 2013. The noise is from interference from the other board components in close proximity to the audio chip.
jaredmorgs said:
Yep, this happens for me as well on my LTE version. It also happened on the Nexus 7 2013. The noise is from interference from the other board components in close proximity to the audio chip.
Click to expand...
Click to collapse
Yes, I also have the LTE version.
Bleh, that's no fun and really annoying. I have never had anything from a reputable brand do this.
The next test would be to see if it does it through USB Audio or Bluetooth Audio. I have a Microsoft LifeChat 3000 headset that I have successfully connected to the tablet, which doesn't seem to have the hiss. It could be due to the impedance of the speakers of this headphone compared with my Shure SE425 IEMs that I notice it more. I also use Tri-flange tips on my IEMs which makes everything more pronounced.
jaredmorgs said:
The next test would be to see if it does it through USB Audio or Bluetooth Audio. I have a Microsoft LifeChat 3000 headset that I have successfully connected to the tablet, which doesn't seem to have the hiss. It could be due to the impedance of the speakers of this headphone compared with my Shure SE425 IEMs that I notice it more. I also use Tri-flange tips on my IEMs which makes everything more pronounced.
Click to expand...
Click to collapse
I did, My USB headset doesn't have this issue (plugged into the shield with a USB OTG cable), my 3.5 mm headphones and cheapo IEMs don't have the issue when plugged into a Sony SBH50 connected to the Shield (via Bluetooth), but they do have the issue when directly plugged into the Shield. Meh.
So that proves that it is the shielding on the 3.5mm jack.
Unfortunately, that's case closed. If it's any consolation, you get used to it after a while.
An update:
I tested with my PC's line-in input, and when I put it in any 24bit mode sound is crystal clear 24/7, I don't get any issues.
mic-in sounds garbage but that's to be expected (I can hear the tablet's internals cause distortion all the time.), it also doesn't always get detected by the tablet.
Is this of the lower impedance that the static noise gets filtered out? I'm not an audio expert.

Bluetooth audio quality

I have an MTCB joying unit. My opinion is that the Bluetooth audio is absolutely atrocious. I have tried all the various suggestions, but nothing really works.
Can anyone comment on the MTCD units, with respect to Bluetooth audio performance? Specifically, the outgoing call quality (how we sound to the person on the other end).
I would really appreciate an opinion from someone who has witnessed the issues on the MTCB units.
Thank you
Sent from my iPhone using Tapatalk
No experience with MTCB units here, but audio quality through Bluetooth (at least in regards to music) isn't all that great. 320kbps mp3s sound almost like they are being transcoded on-the-fly to something ~96kbps. Haven't really used the phone, so can't comment there.
Never understood why using files via bluetooth from my phone. Files on SD Card and all sounds great
Convenience. SD cards have to be removed/updated with new files. Not having internet in the car means that playing music downloaded on phone via Apple Music through Bluetooth would be great if it sounded good.
Piaband said:
I have an MTCB joying unit. My opinion is that the Bluetooth audio is absolutely atrocious. I have tried all the various suggestions, but nothing really works.
Can anyone comment on the MTCD units, with respect to Bluetooth audio performance? Specifically, the outgoing call quality (how we sound to the person on the other end).
I would really appreciate an opinion from someone who has witnessed the issues on the MTCB units.
Thank you
Sent from my iPhone using Tapatalk
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Click to collapse
I can chime in on this somewhat. I came from an old Pumpkin brand rockchip on lollipop, bluetooth was the biggest joke on that thing, 100% unusable it may as well not have existed, microphone quality was inaudible junk to the caller.
I have now upgraded to the new Joying brand Intel Sofia 2GB ram unit, which has Bluetooth 4.0 vs the 3.1 on the MTCB unit. The difference is night and day, when using it for hands free calling the quality is great (has some minor road noise like expected) but its 100% usable. For Music streaming, I never had quality issues for music streaming on the MTCB, however I can tell you the Bluetooth 4.0 intel unit plays/sounds perfect, is MUCH more responsive when skipping tracks or pausing or anything, and has the added benefit of displaying song tite/artist, where Bluetooth 3.1 did not support this.
Edit: Also in the caraudiosettings, there is adjustments for bluetooth mic you can make to fit your needs, high sensitivity, medium sensitivity and low sensitivity on the intel unit.
Skater4599 said:
I can chime in on this somewhat. I came from an old Pumpkin brand rockchip on lollipop, bluetooth was the biggest joke on that thing, 100% unusable it may as well not have existed, microphone quality was inaudible junk to the caller.
I have now upgraded to the new Joying brand Intel Sofia 2GB ram unit, which has Bluetooth 4.0 vs the 3.1 on the MTCB unit. The difference is night and day, when using it for hands free calling the quality is great (has some minor road noise like expected) but its 100% usable. For Music streaming, I never had quality issues for music streaming on the MTCB, however I can tell you the Bluetooth 4.0 intel unit plays/sounds perfect, is MUCH more responsive when skipping tracks or pausing or anything, and has the added benefit of displaying song tite/artist, where Bluetooth 3.1 did not support this.
Edit: Also in the caraudiosettings, there is adjustments for bluetooth mic you can make to fit your needs, high sensitivity, medium sensitivity and low sensitivity on the intel unit.
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Great to hear that.
Does the new intel sofia unit show album art through Bluetooth?
Do you use Bluetooth tethering (if you use an Android smartphone)? If so, how is stability and speed?
KamaL said:
Great to hear that.
Does the new intel sofia unit show album art through Bluetooth?
Do you use Bluetooth tethering (if you use an Android smartphone)? If so, how is stability and speed?
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Click to collapse
No album art support, just titles/names.
I use a Samsung Galaxy S7 Edge, I have not tried Bluetooth Tethering TBH as i just use my wifi hotspot on my phone for internet. I will look into it next time I am in front of it though that would be interesting
Skater4599 said:
No album art support, just titles/names.
I use a Samsung Galaxy S7 Edge, I have not tried Bluetooth Tethering TBH as i just use my wifi hotspot on my phone for internet. I will look into it next time I am in front of it though that would be interesting
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Thanks
Yes, you should try it. It should drain less battery, although speed won't be the same.
Check this thread for an interesting application:
http://forum.xda-developers.com/and...elopment/bluetooth-settings-launcher-t3504526
Piaband said:
Can anyone comment on the MTCD units, with respect to Bluetooth audio performance? Specifically, the outgoing call quality (how we sound to the person on the other end).
Click to expand...
Click to collapse
I have a MTCD Joying VL130 and upstream audio to the other party is quite ok. No difference between internal and external mic.
What I don't like is the fact that downstream audio is only put on the right speaker. This is by design according to Joying support guys. It should reduce the uplink echo...hmm.
So, i have MTCD KD version, and sound realy bad. Idk why
Bluetooth Issues
I have a question with the BT on my unit. I have the external Mic connected and people complain that they can't hear me and they always hang up me. Music works fine but on phone call I have to switch my phone to Speaker. Would disconnecting the external Mic would improve the call quality. Do you suggest I get another external microphone? If you do can you please link me to a good one. Please see the picture for my unit's information.
llaugerm said:
I have a question with the BT on my unit. I have the external Mic connected and people complain that they can't hear me and they always hang up me. Music works fine but on phone call I have to switch my phone to Speaker. Would disconnecting the external Mic would improve the call quality. Do you suggest I get another external microphone? If you do can you please link me to a good one. Please see the picture for my unit's information.
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I'm having this same problem. Any input from anyone?
Need4Camaro said:
I'm having this same problem. Any input from anyone?
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Here is what I did and it worked fine without the need of opening my head unit:
https://forum.xda-developers.com/an...ic-quality-t3339551/post72975889#post72975889
Bluetooth audio/music quality is a joke on my Witson PX5 unit (MX). Sounds like playing a really old cassette tape.

You will need this------2 in 1 Hi Res Audio + Fast Charging adapter By Soulsound.

Without a 3.5mm headphone jack, you cannot charge your phone while you are listening to the music, watching movie or play games.
This adapter can kill your pain above.
Link: https://amzn.to/2mi2BXL
What's special?
1. Hi-Res sound quality with a qualified DAC - 96KHz/24 Bits (Phone to headphone), ADC - 48KHz / 16 Bits (Mic to phone)
2. Max 3A fast charging
Teclover Bill said:
Without a 3.5mm headphone jack, you cannot charge your phone while you are listening to the music, watching movie or play games.
This adapter can kill your pain above.
Link: https://amzn.to/2mi2BXL
What's special?
1. Hi-Res sound quality with a qualified DAC - 96KHz/24 Bits (Phone to headphone), ADC - 48KHz / 16 Bits (Mic to phone)
2. Max 3A fast charging
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Click to collapse
problem is solved with a QI wireless charger, I bought the Samsung S9 wireless charger which is also a stand and is highly rated and can be bought for less than $30, it is a fine piece of kit
Why would you want/need an external DAC when the XZ2P supposedly does 24bit/192KHz decoding on board? I say supposedly because I have not been able to verify that spec on my own XZ2P yet. I use Neutron audio player and the current version as of today only sees 48KHz hardware. The built-in Sony player blows chunks and gives no technical information whatsoever. I can't find an app to verify the underlying audio hardware.
jaytee23 said:
Why would you want/need an external DAC when the XZ2P supposedly does 24bit/192KHz decoding on board? I say supposedly because I have not been able to verify that spec on my own XZ2P yet. I use Neutron audio player and the current version as of today only sees 48KHz hardware. The built-in Sony player blows chunks and gives no technical information whatsoever. I can't find an app to verify the underlying audio hardware.
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Click to collapse
I hate to reply to my own post, but I just verified that it DOES have the hi-res hardware via the instructions in this Neutron forum thread:
http://neutronmp.com/forum/viewtopic.php?f=3&t=4014
I wasn't using the "generic" driver within Neutron and that was the problem. Now that I did, Neutron is working perfectly with the XZ2P! Neutron now shows that it is in fact playing to hi-res audio hardware! It may even be 32-bit, 8 channel, and go up to 384kHz! I'm pretty happy about that. It sounds incredible! Contrary to item #4, I was able to set Neutron up to use the Sony DSP and it works perfectly!

Accessories Favorite USB-C to 3.5mm Adapter/DAC

Hey all, just looking for any input on a USB-C to Headphone adapter/DAC. Wanting something slim or inline for travel. Quite a few options on Amazon ranging from $5-$50, but looking to everyone here for any input with real life experiences. I prefer wired headphones/buds over Bluetooth when traveling.
Under $50 will be the Fiio KA1 or Periodic audio rhodium. If you only want Amazon.
There are lots more good/better options in Ali for under $50.
Thanks. Only looked briefly at Amazon, dont know why I didnt consider checking out Fiio. I have an older, bigger, DAC from them for my HD600's.
I have the ka3 I'm using on my PC and it's amazing.
slugger410ft said:
Hey all, just looking for any input on a USB-C to Headphone adapter/DAC. Wanting something slim or inline for travel. Quite a few options on Amazon ranging from $5-$50, but looking to everyone here for any input with real life experiences. I prefer wired headphones/buds over Bluetooth when traveling.
Click to expand...
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Following as I've gone through 3 adapters and each works at first but then get loose in where it connects to the phone and the audio pauses.
mariojohn said:
Following as I've gone through 3 adapters and each works at first but then get loose in where it connects to the phone and the audio pauses.
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I ran into this on my 6t eventually and hand to put a new usb-c port in. I'm not a fan of an all-in-one port for this reason. But I also understand that a headphone jack can only get to be so small/thin...
Weird, never had an issue with any usb c port wearing out
Lots of people swear by the Apple USB C to 3.5mm adapter, and I can confirm it works great. People say that it's the best overall mobile (or even desktop) DAC until at least $100
Depends on the source and headphones (or speakers) you're playing through. The apple dongle won't be a bottleneck for low to mid quality source and phones but if you use high quality either I would get something nicer.
Apple does a great job with the low end chip in that dongle but there are much newer, better dac chips out there now.
Entry class USB DAC's (under $80 or so) usually adopt an interface chip communicating with the adaptive mode or the synchronous one defined in the USB audio standard. As in these modes an Android host controller sends audio sampling rate clock signals to the DAC, jitter generated at the host side affects the audio quality of the DAC tremendously.
Higher class DAC's communicate with the asynchronous mode (also defined in the standard) to a host controller, but they actually use a PLL to reduce jitter from the host not to stutter even in heavy jitter situations. As this result, they behave as the adaptive mode with a feedback loop to dynamically adjust the host side sampling clock signals while referring a DAC side clock in a real sense, so even with the asynchronous mode they are more or less affected by host side jitter.
You can see the mode of your USB DAC with root permission by opening "/proc/asound/card1/stream0" on your phone while playing music. See a word in parentheses at "Endpoint:" lines; "SYNC", "ADAPTIVE" or "ASYNC" means that your DAC uses "synchronous", "adaptive" or "asynchronous" mode to communicate to your phone, respectively.
If you like Magisk mod's for reducing jitter, see Audio Jitter Silencer and Audio Misc. Settings.
ctfrommn said:
Depends on the source and headphones (or speakers) you're playing through. The apple dongle won't be a bottleneck for low to mid quality source and phones but if you use high quality either I would get something nicer.
Apple does a great job with the low end chip in that dongle but there are much newer, better dac chips out there now.
Click to expand...
Click to collapse
Well I got the FIIO KA1 as an early b'day present over Labor Day weekend. I usually just use buds for everyday listening, but my HD600's definitely sound better with this device. Buds sound better too. Definitely a better bass response, but not over done, and the highs are crisper as well. Not mad at all for the $50 and it's definitely portable.

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