I guess to find out as you say you need to play some very very quieet sound
through the card and see at what level it cuts out, unless the manufacturers
can assist. I have heard of some usb connections kind of going to sleep for
no reason as well, with symptoms of latency at the first use.
I just wish designers would leave this sort of thing alone, as it adds
little to the battery life but must creat havoc for people trying to use the
machine or hardware.
Brian
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----- Original Message -----
From: "Ondrej Rosik" <ondrej.rosik@xxxxxxxxx>
To: <nvda-addons@xxxxxxxxxxxxx>
Sent: Wednesday, June 17, 2015 10:24 PM
Subject: [nvda-addons] Re: addon request: play silence
Well, on my HP probook everithing works fine, just this usb PNP audio device is using this power management which I can not disable. When I open vlc media player or something else which produce audio, the problem goes away. But it seems that internationally, this problem is not so much current as I thought.
Dňa 9. 6. 2015 o 10:23 Brian's Mail list account BY napísal(a):
I have a dell here and its sound seems to stay active all the time just like a desktop sound card. Perhaps its the actual amplifiers that are shut down, giving that soft turn on effect. If that is the case it could just be sound activated in the hardware, much like those tape recorders that switch on when a sound is made. If they are doing this, no amount of software can fix the problem. It would need a sound to play which is loud enough to trigger the circuit to switch on. I found a sub woofer that does this kind of thing.
Brian
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----- Original Message ----- From: "Ondrej Rosik" <ondrej.rosik@xxxxxxxxx>
To: <nvda-addons@xxxxxxxxxxxxx>
Sent: Monday, June 08, 2015 8:08 AM
Subject: [nvda-addons] Re: addon request: play silence
Well, I tryed disabling effects and I also checked the power settings but I can not find specific setting which should affect this. It also happens when the laptop is on electric power too.
Dňa 6. 6. 2015 o 12:33 Brian's Mail list account BY napísal(a):
Are we sure that one cannot actually disable the power management for the device? Most of the time when looking at the power scheme, one can decide which various items are affected and when and turn it on and off.
Not come across this on laptops where nothing can be done though, i have to say.
Brian
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----- Original Message ----- From: "Ondrej Rosik" <ondrej.rosik@xxxxxxxxx>
To: <nvda-addons@xxxxxxxxxxxxx>
Sent: Friday, June 05, 2015 12:35 PM
Subject: [nvda-addons] addon request: play silence
Hi list,
I have one idea for addon developers. Some users have reported that NVDA is responsing too slovly on certain soundcards. In general, some audio devices have power management system which disables the device when it doesn't play any audio. So when you press a key and NVDA wants to say something, you need to wait few miliseconds because the device needs to initialize, and after that play the sound, in this case speech synthesys. The solution is really simple, Play silence. to the device all the time. When you run audio player such as winamp, NVDA is really more responsive, because the audio device is still active. I newer had this problem until this morning where something broke on my laptop and my headphone output doesn't work anymore. I have simple cheap usb audio soundcard. The output of NVDA is slover as in default audio device but when I start audio player and dyrect the output of the player to this device, responsiveness is really better and the same as in normal default audio device on this machine. One way to fix it is run audio player, minimize it to the tray, or use some kind of simple application to play silence all the time. but maybe we should integrate this to NVDA as an addon. My idea is as follows:
After NVDA starts up, the addon wil start playing silent wave file Or if possible, stream silence audio to the audio device dyrectly. Be avare that user may change the audio output by two ways:
1) imput USB device which is set as default. It means that NVDA is set to default device but it is changed by system. This may cause problem, because NVDA will send silence to the old device. Normally, NVDA automatically switch to new device so maybe this will not cause issues.
2) Change the device normally via NVDA settings. In this case simply send the silence stream to new device.
I am currently using one application called soundfix by one czech company. The problem here is that when i disconnect the usb audio device and connect it back again, I need to restart the application because it is probably sending silence stream somewhere else. I will experiment with autohotkey to see, if I can do something better. I have little knowledge about python, so I can't do this addon by myself. But maybe this should help also other users.
Ondrej
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