DMR Rx clicking and other sound problems

VK3KYY
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Location: Melbourne, Australia

DMR Rx clicking and other sound problems

Post by VK3KYY » Sun Jan 02, 2022 11:30 pm

FYI

We currently have a small problem where if the radio is in DMR mode, occasionally there is a buzz sound from the speaker.

This can often occur when a repeater carrier stops transmitting, but also seems to be triggered by random QRM.

We tried to fix this by filling the DMR audio buffer with silence when the DMR Rx signal ends, however this seemed to cause clicking during DMR Rx on some radios.

So I had to remove this buffer clearing, and the next private alpha will have the noises again, until we can find another solution to the problem, because removing the clicking from the DMR Rx audio is more important than the occasional buzz noise

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EA5SW
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Location: Valencia, Spain

Re: DMR Rx clicking and other sound problems

Post by EA5SW » Mon Jan 03, 2022 12:58 pm

Sometimes the audio it's like distorting, and it creeps into modulation... don't have any reason, sometimes distort and some not...

VK3KYY
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Joined: Sat Nov 16, 2019 3:25 am
Location: Melbourne, Australia

Re: DMR Rx clicking and other sound problems

Post by VK3KYY » Mon Jan 03, 2022 8:56 pm

EA5SW wrote:
Mon Jan 03, 2022 12:58 pm
Sometimes the audio it's like distorting, and it creeps into modulation... don't have any reason, sometimes distort and some not...
OK

We are fixing the I2S audio bus problems, but I dont know if the distortion is the on the I2S or whether its perhaps some errors in the DMR audio data.

We do not have a method to detect Rx BER in either the GD77 or MD9600 firmware, so its difficuoit to know where the problem is occurring

VK3KYY
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Joined: Sat Nov 16, 2019 3:25 am
Location: Melbourne, Australia

Re: DMR Rx clicking and other sound problems

Post by VK3KYY » Thu Jan 06, 2022 4:05 am

We think we have a fix for the DMR Rx clicking problem

It was being caused by the I2S buffer being emptied by the C6000 under some conditions

ON6XX
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Joined: Fri Jun 19, 2020 11:41 am
Location: Opoeteren, Belgium

Re: DMR Rx clicking and other sound problems

Post by ON6XX » Thu Jan 06, 2022 1:12 pm

VK3KYY wrote:
Thu Jan 06, 2022 4:05 am
We think we have a fix for the DMR Rx clicking problem

It was being caused by the I2S buffer being emptied by the C6000 under some conditions
Very nice, I hear no longer clicks on DMR RX.

G4EML
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Joined: Sat Nov 16, 2019 10:01 am

Re: DMR Rx clicking and other sound problems

Post by G4EML » Wed Jun 01, 2022 9:58 am

You don’t have this problem, it was specific to the firmware during development and is not something a user can change.

Colin

pu7veg
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Joined: Sun May 15, 2022 11:36 pm

Re: DMR Rx clicking and other sound problems

Post by pu7veg » Fri Sep 30, 2022 1:42 pm

Hello, my Md9600 makes these clicks on the speaker at the end of the analog RX and dmr even with volume at zero, is there a solution?

G4EML
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Joined: Sat Nov 16, 2019 10:01 am

Re: DMR Rx clicking and other sound problems

Post by G4EML » Fri Sep 30, 2022 2:36 pm

This is a design flaw with some versions of these radios.
It needs a hardware mod to fix it.

https://www.pc5e.nl/downloads/rt82/manu ... bridge.pdf


Colin G4EML

VK3KYY
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Location: Melbourne, Australia

Re: DMR Rx clicking and other sound problems

Post by VK3KYY » Fri Sep 30, 2022 8:38 pm

G4EML wrote:
Fri Sep 30, 2022 2:36 pm
This is a design flaw with some versions of these radios.
It needs a hardware mod to fix it.

https://www.pc5e.nl/downloads/rt82/manu ... bridge.pdf


Colin G4EML
There is also a click suppression option in the Sound Options screen

pu7veg
Posts: 3
Joined: Sun May 15, 2022 11:36 pm

Re: DMR Rx clicking and other sound problems

Post by pu7veg » Sat Oct 01, 2022 1:35 am

VK3KYY wrote:
Fri Sep 30, 2022 8:38 pm
G4EML wrote:
Fri Sep 30, 2022 2:36 pm
This is a design flaw with some versions of these radios.
It needs a hardware mod to fix it.

https://www.pc5e.nl/downloads/rt82/manu ... bridge.pdf


Colin G4EML
There is also a click suppression option in the Sound Options screen
Many thanks to all of you, super solved here, the clicks are gone.

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