Thank you guys for your insight into this topic. I do understand that G.711 has limited audio bandwidth that Brian has already explained to me in another thread. Thanks Brian.

However, as i understand there are wide band and ultra wide band codecs, most of which FreeSWITCH already supports. These codecs have audio bandwidth covering almost whole frequency range we as human can hear. Yes these codecs may not be used for calls coming from or go to PSTN. But i am not interested in PSTN origination and termination anyway. I am concerned with high quality digital voice sent/received over good internet connection using FreeSWITCH with these HD codecs.

If we consider the music as noise (most of the music nowadays is noise anyway), how can we prevent it from being recorded, i know this can not be guaranteed 100% but even 60 - 80% reduction / removal of music would be good enough for me to start with. Just to mention, if somebody is talking while the music playing, i don't mind that talk being skipped from recording, the recording should contain talk with no music, (I think this would simplify the solution as we just watch for highest frequency in audio and if that is beyond a certain, predefined range, skip recording otherwise record).

As i understand there are noise filtering techniques like voice activity detection (VAD) or echo cancellation and so on, which may be applied to this situation (although i don't understand much how they actually work). Browsing the online FreeSWITCH docs, i found the module AVMD, that detects voicemail by listening for "beep" sound, so i guess FreeSWITCH can distinguish different frequency audio signals, i just want "not to process" frequency signal that is above a certain frequency range.

Thank you.




On Tue, Mar 18, 2014 at 3:34 AM, Nikolay Rogoshchenkov <nickolayr@gmail.com> wrote:

Sounds very unreliable.
I see only one solution - use (via API)  thirdparty cloud  service like SoundHound with huge music DB of hashes.

On Mar 17, 2014 8:57 PM, "Muhammad Shahzad" <shaheryarkh@gmail.com> wrote:
nah, i just want to skip the music, not the human voice even if s/he is singing. I am not an expert in this area but i think usually male's voice is around between 300 - 3000 Hz and females have a little higher frequency, while most of musical instruments are over 5000 Hz. So, if we can see audio is less then say 5000 Hz then record else, skip. Just a rough idea, i am sure professionals like you can devise something better or improve this.

Thank you.




On Mon, Mar 17, 2014 at 8:16 PM, Brian West <brian@freeswitch.org> wrote:
So all I have to do is sing my whole call and i’ll never be recorded… ;)

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On Mar 17, 2014, at 5:13 AM, Muhammad Shahzad <shaheryarkh@gmail.com> wrote:

> Hi,
>
> Is there a way we can detect music on an answered call? Basically i want to record the call but there may be music in beginning, during or at the end of call, which i do not want to be recorded.
>
> Is it possible? If not, are there any tools that can do that on an already record file?
>
> Thank you.


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