speaker hiss
- ShowMaster
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Re: speaker hiss
The sounds are definitely not what I hear. Yes to getting a few of these boards in Mikes hands and maybe a few tech types that can converse on what's going on.
I'm willing if anyone's in the LA area or can arrange an exchange.
I'm willing if anyone's in the LA area or can arrange an exchange.
Re: speaker hiss
Mine has this high pitch noise. But at very low volume. It doesn't really bother me and for me it is important to have a clear noiseless sound..
João
João
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- ShowMaster
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Re: speaker hiss
Finding and fixing the loud clicking and buzzing is my first concern. The higher pitched background noise isn't heard at my field above the gas and turbines flying. Find that first and then go after the lesser sounds. My Taranis is about the same level in a quiet place as my 9xt is now. Having older ears helps there. Something positive I guess for too many birthdays.
I'm on my way now to a work on a tv show with 110-120db sound going on. Ear plugs all day!
I'm on my way now to a work on a tv show with 110-120db sound going on. Ear plugs all day!
Re: speaker hiss
Reformat the SD card.
- ShowMaster
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Re: speaker hiss
Couldn't hurt.
Re: speaker hiss
except that it's already been done at least 3 timestedbmoss wrote:Reformat the SD card.
- Greg -
- MikeB
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Re: speaker hiss
Catching up with things to do!
On the test versions post, I've just posted a specific test version to try to work out the cause of the loud buzz when audio files are playing.
I had previously had an audio tone file played with two different sample rates and bitsper sample. That indicated accesses to the SD card (on that radio) were causing the noise. This test version does some specific tests on the SD card signals.
From the main screen, press UP LONG, then RIGHT a few times until you get to a DEBUG screen. This lists Audio Test, and you may choose test 0, 1 or 2. The test is started by pressing MENU. To stop a test, press EXIT.
Please try all three tests in turn and let me know which, if any, cause any clicking/buzzing on the audio.
Interestingly, I have a very low level clicking on my speaker, but when pressing EXIT from these tests, it stops for a moment. This gives me something to experiment with.
Mike.
On the test versions post, I've just posted a specific test version to try to work out the cause of the loud buzz when audio files are playing.
I had previously had an audio tone file played with two different sample rates and bitsper sample. That indicated accesses to the SD card (on that radio) were causing the noise. This test version does some specific tests on the SD card signals.
From the main screen, press UP LONG, then RIGHT a few times until you get to a DEBUG screen. This lists Audio Test, and you may choose test 0, 1 or 2. The test is started by pressing MENU. To stop a test, press EXIT.
Please try all three tests in turn and let me know which, if any, cause any clicking/buzzing on the audio.
Interestingly, I have a very low level clicking on my speaker, but when pressing EXIT from these tests, it stops for a moment. This gives me something to experiment with.
Mike.
erskyTx/er9x developer
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- ShowMaster
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Re: speaker hiss
So many threads going on Mike. Could you please post the links to any new upgrades or test Fw's just to be sure.
I have these saved so far
viewtopic.php?f=95&t=7182
viewtopic.php?f=7&t=4676#p65894
viewtopic.php?f=126&t=7751
I have these saved so far
viewtopic.php?f=95&t=7182
viewtopic.php?f=7&t=4676#p65894
viewtopic.php?f=126&t=7751
- MikeB
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Re: speaker hiss
Oops, I'd forgotten I'd added the thread from the last link you reference!
Normally I post the test versions on the post of the middle link, which is where this test version is.
I'll try to be more careful and specific in future!
Mike.
Normally I post the test versions on the post of the middle link, which is where this test version is.
I'll try to be more careful and specific in future!
Mike.
erskyTx/er9x developer
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Re: speaker hiss
Mike, this test version applies to me as well, or is it only for the ones that have severe audio problems??
Thanks
João
Thanks
João
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- MikeB
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Re: speaker hiss
Those with severe audio problems, particularly if there is a buzz/clicking when a voice file is playing that stops when the voice file plays.
You may try it. When I ran the tests, I couldn't hear anything different.
Mike.
You may try it. When I ran the tests, I couldn't hear anything different.
Mike.
erskyTx/er9x developer
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Re: speaker hiss
I'll take a video in the am so you can see / hear for yourself, but I upgraded the firmware and ran the tests...there's no change in the clicking at all (from what I can hear).
Last edited by gb21914 on Wed Nov 18, 2015 3:12 am, edited 1 time in total.
- Greg -
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Re: speaker hiss
Just because it was discussed, I swapped out the speaker with a larger 8 ohm like the one I used in my Taranis update. It didn't help with the faint high freq buzz. I didn't think that it would, but it was on my list.
For Mike,
I'm trying to scope the amp circuit but haven't figured out how to scope the output. It doesn't reference to ground. I have a dual trace scope so maybe both probes on the speaker leads, invert one channel?
I probed the input to the amp but didn't see anything I could reference to the data buzz I hear.
Not having the loud choppy audio and just the faint buzz is what I'm dealing with. The audio circuit below the amp is prone to picking up my cfl lamp buzz if I put my finger on the trace. That area may be prone to some RFI if a high a rf power module is used. No issue I cold tell with the xjt I'm using however.
The Taranis can be sensitive to the antenna bent left or right coupling RF into its audio I find.
I'll load in your test tone fw next.
Busy week next week, not home until late so I may not get Rc time until the weekend again.
For Mike,
I'm trying to scope the amp circuit but haven't figured out how to scope the output. It doesn't reference to ground. I have a dual trace scope so maybe both probes on the speaker leads, invert one channel?
I probed the input to the amp but didn't see anything I could reference to the data buzz I hear.
Not having the loud choppy audio and just the faint buzz is what I'm dealing with. The audio circuit below the amp is prone to picking up my cfl lamp buzz if I put my finger on the trace. That area may be prone to some RFI if a high a rf power module is used. No issue I cold tell with the xjt I'm using however.
The Taranis can be sensitive to the antenna bent left or right coupling RF into its audio I find.
I'll load in your test tone fw next.
Busy week next week, not home until late so I may not get Rc time until the weekend again.
Re: speaker hiss
probable a bit of a simple answer to the problem, why not a simple cut off filter, it'll get rid of the hiss
Re: speaker hiss
From what I gather in this thread, and my observations of my own installation, there is more than just "hiss". I have faint clocking/data "buzz" as well as what I'd call minor hiss (old ears though, so I accept that "hiss" may be more apparent to the younger gen. ).stewwy wrote:probable a bit of a simple answer to the problem, why not a simple cut off filter, it'll get rid of the hiss
"Hiss" would be caused by wide audio frequency response as you suggest (add a capacitor across the output somewhere) but the associated clocking/data "buzz" also suggests to me there's a circuit and/or layout coupling/bypass issue that needs to be addressed somewhere. I have the feeling that just removing "hiss" would only make "buzz" (and/or other somesuch) the subject of discussion instead.
- MikeB
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Re: speaker hiss
I've just posted a test version that doesn't use the I2C interface. On my Tx, this stops the 'buzz' I can hear.
I recorded the sound I could hear in Audacity so I could see the buzz was at 20Hz. This gave me the hint as to the possible source of it.
Looking at the tracking, I think the I2C signals and the audio signal run a long way close to each other.
Mike.
I recorded the sound I could hear in Audacity so I could see the buzz was at 20Hz. This gave me the hint as to the possible source of it.
Looking at the tracking, I think the I2C signals and the audio signal run a long way close to each other.
Mike.
erskyTx/er9x developer
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Re: speaker hiss
options?
Mine doesn't bother me..
João
Mine doesn't bother me..
João
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- MikeB
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Re: speaker hiss
For more permanent use I've added a hardware option, for the 9Xtreme, to enable/disable the I2C interface usage.
Mike.
Mike.
erskyTx/er9x developer
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Re: speaker hiss
Yes, they sure do!MikeB wrote:Looking at the tracking, I think the I2C signals and the audio signal run a long way close to each other.
I've attached a few images. One shows the problem, with the audio signal track running a LONG way sandwiched between the two I2C data lines (is that not an example of the theoretical worst thing I could have done in this situation?). The others showing a possible hacker's solution, if they want to rectify the situation and still retain use of their I2C. Caution: we're talking about very small components so a steady hand, good magnification, and an understanding how to remove surface mount chips is required.
The idea is to remove the indicated chips (10k resistor and 0.1uF capacitor) shown, then solder wires, preferably shielded, to the tiny pads and re-make the connection. You'll have to get a new resistor and capacitor and wire them in-line to recreate the circuit.
Not something I'm recommending. Just the best solution I can think of right now.
Obviously I'll adjust the design for future batches now that I'm aware of the problem. In the prototype, the tracks were almost the same, but the audio was on the outside rather than running in between.
Re: speaker hiss
I just tried your version that disables the I2C. In fact that eliminates the helicopter sound I have reported earlier.. But the volume is so low that it doesn't bother me at all. The high pitch noise is worse in my opinion. This one starts when the radio clears the splash screen and enters normal operation. Again, it is also very low..
João
João
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Re: speaker hiss
What about not removing the resistor and capacitor (I presume they are in series), cut the traces eliminating that track, and solder a very thin wire between the resistor and the capacitor? It could also be a shielded audio cable from an old earphone, with the shield soldered to ground somewhere..s_mack wrote:
The idea is to remove the indicated chips (10k resistor and 0.1uF capacitor) shown, then solder wires, preferably shielded, to the tiny pads and re-make the connection. You'll have to get a new resistor and capacitor and wire them in-line to recreate the circuit.
João
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Re: speaker hiss
Dealer's choice... but cutting those traces is more difficult, in my opinion.jhsa wrote:What about not removing the resistor and capacitor (I presume they are in series), cut the traces eliminating that track, and solder a very thin wire between the resistor and the capacitor? It could also be a shielded audio cable from an old earphone, with the shield soldered to ground somewhere..s_mack wrote:
The idea is to remove the indicated chips (10k resistor and 0.1uF capacitor) shown, then solder wires, preferably shielded, to the tiny pads and re-make the connection. You'll have to get a new resistor and capacitor and wire them in-line to recreate the circuit.
João
- MikeB
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Re: speaker hiss
Most are only reporting very low noise levels. I feel the few with high noise levels have some other problem as well.
I'm attempting to locate the source of other noise.
Mike.
Edit: The next significant noise is at 500Hz (every 2mS). This is the rate at which the main loop runs. I dropped this rate to 250Hz and the noise reduced in frequency to 250Hz. I'll now need to look for a hardware signal the main loop drives at this rate.
I'm attempting to locate the source of other noise.
Mike.
Edit: The next significant noise is at 500Hz (every 2mS). This is the rate at which the main loop runs. I dropped this rate to 250Hz and the noise reduced in frequency to 250Hz. I'll now need to look for a hardware signal the main loop drives at this rate.
erskyTx/er9x developer
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Re: speaker hiss
This is like reading a Sherlock Holmes novel, I can't wait to see what happens in the next chapter.
Custom 9x with M64/Telemetry Mod
Re: speaker hiss
So I've been playing around with my transmitter, setting up telemetry and I'm not sure if I've stumbled across something or not.
I have the FRSKY D8R Plus II receiver in my bird, and have channel A1 setup as an internal voltage monitor. This seems to work fine, and I get a solid 5.0V across the telemetry screen. I also get my channel TSSI and RSSI...all good.
BUT
I noticed that my A2 channel has values...which at first glance is good...except that my voltage reader is not connected. I literally have nothing connected to A2...and yet the channel is "cross populating" data somehow?
This is unexpected behaviour? Could this also be contributing to the hiss or "helicopter"?
I have the FRSKY D8R Plus II receiver in my bird, and have channel A1 setup as an internal voltage monitor. This seems to work fine, and I get a solid 5.0V across the telemetry screen. I also get my channel TSSI and RSSI...all good.
BUT
I noticed that my A2 channel has values...which at first glance is good...except that my voltage reader is not connected. I literally have nothing connected to A2...and yet the channel is "cross populating" data somehow?
This is unexpected behaviour? Could this also be contributing to the hiss or "helicopter"?
- Greg -
- MikeB
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Re: speaker hiss
The receiver is always reading the two analog inputs and sending them to the Tx, whether you have anything connected to them or not. If the A2 input is not connected, it is likely to read a similar physical voltage (0-3.3V) as A1. This is then sent to the Tx. Depending on your setting for A2 ratio in the Telemetry menu, you will then get a value displayed. If you have nothing connected to A2, then set the A2 ratio to 0.
This is quite normal and expected.
Mike.
This is quite normal and expected.
Mike.
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- MikeB
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Re: speaker hiss
Have you tested either of the test versions posted here: viewtopic.php?f=126&t=7751#p103194, that disable the I2C interface?
I don't think I've seen a report from you having done so.
Mike.
I don't think I've seen a report from you having done so.
Mike.
erskyTx/er9x developer
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Re: speaker hiss
Yup, one of the first to do it. No noticeable changes for me. I used the first test version (the version posted below).gb21914 wrote:I'll take a video in the am so you can see / hear for yourself, but I upgraded the firmware and ran the tests...there's no change in the clicking at all (from what I can hear).
ersky9x9XT_romXenc.zip
17-Nov-2015 16:28
- Greg -