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THRobinson · 2017-06-27, 19:24

I recently switched to Openelec from Win7 with KODI, and changed a few pieces of hardware so can't say for certain if hardware or software causing the issues.

Basically, from the main screen of KODI I have a high pitched hiss. I still have it if streaming (most of the time). If I play a video file, it goes away, even if I click pause, the sound is gone.

OpenElec/Kodi is running off a 32GB SSD drive, which is new (use to be a 250GB HDD) and I also swapped out the GTX650TI card for a fanless GeForce (forgot the model). Also replaced the CPU fan for something quieter. Wanted a quiet HTPC, but after switching to a new case, it was pretty loud. Sound carried a lot more.

So, not sure if the software making the hiss? I don't think the GPU/HDMI else why would I get hiss from streaming not from stored files?

I do have 2x3TB HDDs with TV/Movies on them, and it's when I play from there that I no longer have the hiss.

Could the sound be from the cheap SSD drive? fans? software?

**fritsch** · 2017-06-27, 20:09

Unplug one by one? :-) and carefully stop one of the fans while running or before starting?

THRobinson · 2017-06-27, 20:13

Not sure that will tell me much since the main culprits I can't unplug.

CPU fan I can't else kill the CPU, SSD I can't because it's the primary, and GPU I can't because will do some hard pulling that out while system is running.

**fritsch** · 2017-06-27, 20:21

You won't kill the cpu if you do that for 3 seconds. Same for powersupply.

In fact nobody knows where the noise is coming from your system if you don't check these things out yourself.

HiassofT · 2017-06-27, 23:04

Have you tried disabling "Send low volume noise" in audio settings (settings level must be set to advanced, it's normally hidden)?

On an older LG TV having this setting on causes rather annoying noise (the TV probably doesn't turn off the builtin amp because of it).

so long,

Hias

**fritsch** · 2017-06-28, 06:48

That feature was designed to forcefully keep avrs enabled. You can change the nosie to silence while keeping it enabled.

THRobinson · (This post was last modified: 2017-08-14, 05:10 by THRobinson.)

(2017-06-27, 23:04)HiassofT Wrote: Have you tried disabling "Send low volume noise" in audio settings (settings level must be set to advanced, it's normally hidden)?

On an older LG TV having this setting on causes rather annoying noise (the TV probably doesn't turn off the builtin amp because of it).

so long,

Hias

Weird, didn't get any notification that there were replies...

"Send low volume noise" was totally it. Problem is when disabled, it's even more annoying. Flipping through the menus, sometimes it makes the click noises, sometimes not, and quite often you're getting the p p p noise as the audio cuts in/out.

I assumed a hardware issue but when I switched computer cases and a few bit of hardware, I also switched to OpenElec and the updated KODI. I was still using the previous version, which I guess didn't have this function.

Is there a 3rd option? Where I don't have the feature enabled emitting that high pitch frequency, and where the audio isn't constantly going on/off while navigating the menus? I don't recall having either issue in version 16.

HiassofT · 2017-08-14, 09:15

Make sure "keep audio device alive" isn't set to "never". Otherwise kodi will open+close the audio device on each "click". The default of 1 minute usually is fine but you can also try "forever".

If you still get missing clicks and pops you either have to see if there are some audio power saving settings in your amp/tv/speaker system or enable "send low volume noise" again.

so long,

Hias

THRobinson · 2017-08-14, 18:16

I was playing with the keep alive, but didn't seem to make a difference, unless I had it set to never in which case I lost all clicks when going through the menu. I set it back to the default 1 minute.

I'll check the TV, it's a Sony Bravia... not sure if it has that option or not. I have the HTPC plugged into the Sony TV, then it connected to a Sony 2.1 soundbar.

Again... never had this issue in versions 12-16, but when I switched to OpenElec and upgraded to version 17 of KODI, this 'sssssss' noise has been driving me nuts.

I'd downgrade but, not overly familiar with OpenElec, always used KODI with Win7... not sure if a downgrade to version 16 of KODI is available. Plus, I hate downgrading. Smile

**fritsch** · 2017-08-14, 20:51

There is a simple setting changing noise to zeros, just under the keep alive setting. The noise method is the same as in v16... zero changed.

THRobinson · 2017-08-14, 22:04

(2017-08-14, 20:51)fritsch Wrote: There is a simple setting changing noise to zeros, just under the keep alive setting. The noise method is the same as in v16... zero changed.

Well, not sure what changed then... been using KODI/XBMC for years and never had this issue until now. Thought maybe the new video card, but, stuck the old one back in and made no difference.

I'll try the noise to zeros when I get home, see if it helps.

It's fine when watching a movie or tv show, for locally stored files. But in the menu screens, it makes the hairs on the back of the neck stand on end.

**fritsch** · 2017-08-14, 22:23

Noise function in v13: https://github.com/xbmc/xbmc/blob/Gotham...k.cpp#L905 <- here I wrote it
Noise function in v14: https://github.com/xbmc/xbmc/blob/Helix/...k.cpp#L874
Noise function in v15: https://github.com/xbmc/xbmc/blob/Isenga...k.cpp#L876
Noise function in v16: https://github.com/xbmc/xbmc/blob/Jarvis...k.cpp#L876
Noise function in v17: https://github.com/xbmc/xbmc/blob/Krypto....cpp#L1083
Noise function in v18: https://github.com/xbmc/xbmc/blob/master....cpp#L1083

What I personally think is that your TV is new and does not like it. If you build from source add another 0 behind the . and see if it ignores it then :-)

THRobinson · 2017-08-14, 22:43

Absolutely none of those links made any sense to me at all. Smile

My SONY TV is probably pushing 8yrs old. I've had it since before I started using KODI... well, before I started using XBMC.

**fritsch** · 2017-08-15, 06:46

In short: Not a single bit has changed in the Noise generating method since ~ 8.5 years.

Gotham:

Code:
noise[i] = (float) sqrt( -2.0f * log( R1 )) * cos( 2.0f * PI * R2 ) * 0.00001f;

Leia:

Code:
noise[i] = (float) sqrt( -2.0f * log( R1 )) * cos( 2.0f * PI * R2 ) * 0.00001f;

THRobinson · 2017-08-15, 22:54

(2017-08-14, 22:23)fritsch Wrote: Noise function in v13: https://github.com/xbmc/xbmc/blob/Gotham...k.cpp#L905 <- here I wrote it
Noise function in v14: https://github.com/xbmc/xbmc/blob/Helix/...k.cpp#L874
Noise function in v15: https://github.com/xbmc/xbmc/blob/Isenga...k.cpp#L876
Noise function in v16: https://github.com/xbmc/xbmc/blob/Jarvis...k.cpp#L876
Noise function in v17: https://github.com/xbmc/xbmc/blob/Krypto....cpp#L1083
Noise function in v18: https://github.com/xbmc/xbmc/blob/master....cpp#L1083

What I personally think is that your TV is new and does not like it. If you build from source add another 0 behind the . and see if it ignores it then :-)

With those links, I have no idea where the 0 is behind the ".".... which wouldn't matter anyways, I have no idea how to edit it. I opted to switch to OpenElec and a small 16GB SSD drive, instead of the 250GB drive and Win7x64. Maybe that's a factor?

But ya, I don't know LINUX/UNIX or whetever OpenElec is based off, and OpenElec doesn't seem to have an O/S Gui.

I'll either have to put the HDD back in with Win7 and see if makes a difference, or probably live with it.