Database Users

Waveform audio interface problems (waveIn* waveOut*)

Hi all!
Now I'm working on small audio library for PocketPC. Library using waveform audio interface (waveIn* and waveOut* functions). I have big problem with full duplex audio. Whem I'm open audio device for input, the sound from microphone is playing on the speaker. If I start playing some another sounds - they are mixing with input sounds. I want to separate input audio stream from output audio stream. Device doesn't have mixer, mixerGetNumDevs returnes 0, and mixerOpen also fails.

I have just the same problem. One workaround is to lower the sound volume level, the second is to use some echo canceller. The only echo canceller source code I have uses lots of floating point functions, so it is extremely slow on Pocket.

Bluetooth A2DP Headphones Problem

I recently upgraded from a Nokia N95 to a Touch HD. I've been trying to get my Sony DRBT21 bluetooth headphones to work with the touch HD. The phone pairs with the headphones, but the sound quality is poor with no bass and sounds crackly.
Additionally when I turn off/on the headphones, only the headset and microphone profiles connect back to the phone, not the A2DP stereo part. The only way I've found to get it to reconnect is to repair them.
Any idea if this is a known issue with A2DP headphones on the Touch HD? I'm not expecting to get brilliant audio quality, but as it is right now with crackles and distortion it isn't worth listening to.
Just wondering if anyone has any ideas on how I can fix or optimise this?
Cheers

Was the device properly paired? Were you prompted for the PIN? If not, do so manually by going to Bluetooth settings and pair the headset from there.
As for the A2DP not being available when reconnecting, this seems to be a known issue as I experience this intermittently with HTC's own Bluetooth and another third-party one, too. This issue was also observed on my previous HTC Polaris! A workaround for this issue for me is to power off Bluetooth and then power it back on: not a good solution!

It prompted for the PIN which I entered, and looks to be set up correctly. The main issue seems to be the background static when listening to music (hissing and crackling). Is there anything in Advanced config that could be tinkered with to try and alleviate the problem?

This won´t help you:
My Motorola S9 and HT820 (Both A2DP/AVRCP) working fine with HD and Diamond. Also I had some difficulties reconnecting the first times, due to the not used pairing-PIN. The motos doesn´t need it. The HD and the diamond needed some time to accept this
Now they reconnect as Hedset and Stereoheadphons.
Maybe there is another BT-Master (your old phone) active that occupies the A2DP connection with your headset.

I have one HD and S9, sometimes it's a little hard for them to connect but the sound can be very good, the only problem is that with high BitPool values above 30 (medium quality) it's very easy to break the sound when the HD is in our pockets and we are outside the house.

hi, im using the same headphone with you. you got that cracking noise with no bass because it's playing via the headset function, not as stereo headphone.
try disable the heatset option in the bluetooth, then open your music player and try again.
And yes, when u turn off your headset improperly. i.e. turn off from the power button, and not through bluetooth -> disconnect, then turn off... you will have to go to setting -> set as stereo headphone...

I had a play around with Advanced config and found that if I change the max bitpool from 30 to 50, the crackling and static disappears. It seems better now. Many thanks!
Edit: Changed to Max Bitpool 80 and Min 65 and the quality is brilliant. Found some further information from a post on another site (PPCSG) which may be useful to any with a similar issue:
Using ACT (Advance Config Tool), go to BLUETOOTH:
*below are my settings->
-Use Joint Stereo: Yes (default)
-Bitpool: Very High
-Max supported bitpool: 80
-Min support bitpool: 65
-Sample rate: 48000Hz
*My settings may not be the best, therefore you may want to trial and error.
The following shows the named values for the A2DP\Settings key.
By default, A2DP uses a bitpool of 48. A lower bitpool value improves system performance. Increasing bitpool to a higher value causes an overhead on Bluetooth and system resources.
Microsoft suggests the following bitpool values for optimal buffer sizes.
30 - Low audio quality
40 - Medium audio quality
48 - High audio quality
58 - Excellent audio quality
-The maximum reported bit pool value, which can be negotiated with the peer device. Default value is 80.
-The minimum reported bit pool value, which can be negotiated with the peer device. Default value is 14.
-SBC sample rate to use. Default value is 44.1 KHz.

least of your worries...
what bothers Me more is that the old A2DP bug from the HTC Diamond has made its way to the HD ROM, in that if you listen to music via A2DP and recieve a phone call, you take that call and end that call then your music continues playing through the phone speakers! You have no idea how embarassing this is on a train!

that doesnt happen on mine, go straight back to my headphone again...

Even though it doesnt happen on mine, to be safe I plug a dummy headphone jact to the phone so even if bt gets disconnected, no sound goes through decice speakers. Makes me feel comfortable on the train. This was also an issue with Cruise which was addressed by a hotfix later on.

gurluver said:
try disable the heatset option in the bluetooth, then open your music player and try again.
Click to expand...
Click to collapse
Tried that, and the difference is staggering!
I can now confirm that it isn't a hardware issue, that these phones (Sony HBH-IS800) are capable of sound quality just as good as other Sony in-ear jobs. Thanks for that!
Now, all I have to do is try to sort out the drop-outs. It seems as though the slightest barrier can cause drop-outs, for instance, putting the phone in my jacket pocket, or passing my jacket sleeve in front of it. Not sure whether it's the particular material of my jacket, or the metal in the buttons, or what, but it's hugely irritating.
Funnily enough, seems to make a difference if I have the connecting wire behind or in front of my neck. More to follow on this one....
Cheers
Pete

noise ?
For people using the HD and motorola S705 as bluetooth A2DP : do you have also an annoying background noise when listening to quiet music ? Or before the sound starts. You know a noise like pffffffffffffffffffffff

HTC P3600
Hello,
I already installed the tornado_a2dp.cab on my PDA HTC P3600 with WM5. but I can't sincronize MP3 (Windows Media Player or TCPMP) with my headphones Nokia BH-206.
Anybody help me to solve this problem?
The mp3 sound only worked (10seconds) in Windows Media Player when I press the button to do a call

Hi.
I have done the changes mentioned in this thread and got much better sound when listening to music.
But i still have a static noise when im in a call.
Is there a way to fix this?

mugis said:
I had a play around with Advanced config and found that if I change the max bitpool from 30 to 50, the crackling and static disappears. It seems better now. Many thanks!
Edit: Changed to Max Bitpool 80 and Min 65 and the quality is brilliant. Found some further information from a post on another site (PPCSG) which may be useful to any with a similar issue:
Using ACT (Advance Config Tool), go to BLUETOOTH:
*below are my settings->
-Use Joint Stereo: Yes (default)
-Bitpool: Very High
-Max supported bitpool: 80
-Min support bitpool: 65
-Sample rate: 48000Hz
*My settings may not be the best, therefore you may want to trial and error.
The following shows the named values for the A2DP\Settings key.
By default, A2DP uses a bitpool of 48. A lower bitpool value improves system performance. Increasing bitpool to a higher value causes an overhead on Bluetooth and system resources.
Microsoft suggests the following bitpool values for optimal buffer sizes.
30 - Low audio quality
40 - Medium audio quality
48 - High audio quality
58 - Excellent audio quality
-The maximum reported bit pool value, which can be negotiated with the peer device. Default value is 80.
-The minimum reported bit pool value, which can be negotiated with the peer device. Default value is 14.
-SBC sample rate to use. Default value is 44.1 KHz.
Click to expand...
Click to collapse
I am having the same problem as you on my HTC Incredible. Any idea of an app that lets you configure those settings for Android?

Patched H2W_ACCESSORY for broken headphone jack

Hi.
If you have broken headphone jack (audio is played only on earphones) you can use this driver. It doesn't recognize jack, so music is played just on speaker(s).
It's modified driver from official 20764 ROM, unsigned (you need sign it when you don't have patched nk).
When you want switcher, rename dll (eg. "H2W_ACCESSORY2.dll"), and write small script in MortScript.
Example:
Code:
H2W = RegRead("HKLM", "Drivers\BuiltIn\H2W_Accessory", "Dll")
Speaker = "H2W_ACCESSORY2.dll"
Headset = "H2W_ACCESSORY.dll"
If(H2W eq Headset)
q = "speaker"
Else
q = "earphones"
EndIf
If(Question( "Do you want to switch audio output to "&q&"?", "Question", "YesNo"))
If(H2W eq Headset)
RegWriteString("HKLM", "Drivers\BuiltIn\H2W_Accessory", "Dll", Speaker)
Else
RegWriteString("HKLM", "Drivers\BuiltIn\H2W_Accessory", "Dll", Headset)
EndIf
If(Question( "Changes to take effect, perform a soft-reset. Do you want to soft-reset your device now?", "Question", "YesNo"))
reset
EndIf
EndIf

thanks man

[Q] Bluetooth Audio Improvement GE!?

Hello,
Can somebody modify the audio.a2dp.default.so from Actual 4.3 GE Rom to increase our BT Audio Quality.
The mod looks lieke that:
bitpool
D/A2DP ( 111): min_bitpool: 2
D/A2DP ( 111): max_bitpool: 53
D/A2DP ( 111): bitpool=53
Can somebody check how it is set and when not set to this value modify this File and post it again?
I think this is the only way to improve quality when not using AOSP based roms!
BT quality is not bad, but compared to normal MP3 files from SD it is quiet poor in my car, so when there is something which can be improved... lets try!

File attached!

Audio bit rate in video recordings

I'd like to find out whether the device can do more than this:
(+) Audio (aac 2ch 48000Hz) @ 96kbps
/system/etc/media_profiles.xml has a dedicated entry for the audio quality in aac and it shows that the max. bps is 96000, which is what all video files use as their audio encoders.
I have played around with some professional audio equipment and managed to connect a Steinberg/Yamaha audio interface to the OP5 via USB to go and it provided enough power to drive the external condenser mics with 48V phantom power.
The native OP camera app doesn't enable external microphones when plugged in, but 'OpenCamera' does and I've made a video of myself playing the piano:
https://www.youtube.com/watch?v=by_9NInRfzE
In the original file the audio only has the specified bitrate as shown in this entry of the media_profile.xml:
Code:
<AudioEncoderCap name="aac" enabled="true"
minBitRate="8000" maxBitRate="96000"
minSampleRate="8000" maxSampleRate="48000"
minChannels="1" maxChannels="6" />
Is there a way to specify a distinctly higher bitrate for the audio track of a video, specifically with 3rd party applications that allow for external microphones?