Improving intelligibility for soft speech

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Improving intelligibility for soft speech

Stefan Oud
Dear Linphone developers,

I have a question about improving signal processing at low microphone levels.
I am working on a Linphone version that is intended to work with low microphone input (for example whispering).
For this to work, I have to amplify low input levels.
When looking inside MediaStreamer2, I have found a filter called msvolume, that has automatic gain control included.
There are also settings in linephonerc_factory under [sound] where certain audio settings can be changed (ng_thres, ng_floorgain, dc_removal, el_speed, el_thres, el_force, el_sustain, el_transmit_thres and mic_gain).
I have found that there is a noise gate, which is not in the volume controllers in the input stack (microphone equalizer, volume controller and echo cancellation).
Does someone know where I can find it?
How can I change the default settings to amplify soft sound without causing audio feedback loops or clipping in regular speech?
I hope someone has an answer.

Best regards

Stefan Oud


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Re: Improving intelligibility for soft speech

Maisha Infotech
Dear Linphone Developers

Can someone help me with configuration a stun and turn server in lib libraries. As we done everything but facing one side audio in two different network.

Thanks

> On 05-Jul-2019, at 3:32 PM, Stefan Oud <[hidden email]> wrote:
>
> Dear Linphone developers,
>
> I have a question about improving signal processing at low microphone levels.
> I am working on a Linphone version that is intended to work with low microphone input (for example whispering).
> For this to work, I have to amplify low input levels.
> When looking inside MediaStreamer2, I have found a filter called msvolume, that has automatic gain control included.
> There are also settings in linephonerc_factory under [sound] where certain audio settings can be changed (ng_thres, ng_floorgain, dc_removal, el_speed, el_thres, el_force, el_sustain, el_transmit_thres and mic_gain).
> I have found that there is a noise gate, which is not in the volume controllers in the input stack (microphone equalizer, volume controller and echo cancellation).
> Does someone know where I can find it?
> How can I change the default settings to amplify soft sound without causing audio feedback loops or clipping in regular speech?
> I hope someone has an answer.
>
> Best regards
>
> Stefan Oud
>
> _______________________________________________
> Linphone-developers mailing list
> [hidden email]
> https://lists.nongnu.org/mailman/listinfo/linphone-developers


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Re: Improving intelligibility for soft speech

Elisa Nectoux
In reply to this post by Stefan Oud
Hi Stefan,

I apologize for my belated answer.

Your question is technically complex. For this kind of assistance requests, our development assistance service is recommended so that we can dedicate the necessary time to your team.
Our entry service is 20 hours of chat/emails development assistance for 3000 euros. This service ends 3 months after purchase order.

This service provides technical development assistance and support by e-mail and web chat to support any compilation or development you or your technical team are performing on our softwares. Through this service our engineers answer directly any questions regarding our softwares’s source code and provide technical advice on how to implement and add new features or overcome issues you may come to face.

If you are interested in a proposal for this service, please contact me at [hidden email]

Elisa Nectoux
Sales & Marketing

+33 (0)9 52 63 65 05
[hidden email]

Belledonne Communications, the company behind the Linphone project



Le 5 juil. 2019 à 12:02, Stefan Oud <[hidden email]> a écrit :

Dear Linphone developers,

I have a question about improving signal processing at low microphone levels.
I am working on a Linphone version that is intended to work with low microphone input (for example whispering).
For this to work, I have to amplify low input levels.
When looking inside MediaStreamer2, I have found a filter called msvolume, that has automatic gain control included.
There are also settings in linephonerc_factory under [sound] where certain audio settings can be changed (ng_thres, ng_floorgain, dc_removal, el_speed, el_thres, el_force, el_sustain, el_transmit_thres and mic_gain).
I have found that there is a noise gate, which is not in the volume controllers in the input stack (microphone equalizer, volume controller and echo cancellation).
Does someone know where I can find it?
How can I change the default settings to amplify soft sound without causing audio feedback loops or clipping in regular speech?
I hope someone has an answer.

Best regards

Stefan Oud

_______________________________________________
Linphone-developers mailing list
[hidden email]
https://lists.nongnu.org/mailman/listinfo/linphone-developers


_______________________________________________
Linphone-developers mailing list
[hidden email]
https://lists.nongnu.org/mailman/listinfo/linphone-developers