[asterisk-users] MusicOnHold Files

[Yuan LIU]

>From: Carla Schroder <carla at bratgrrl.com>
>
>On Thursday 04 January 2007 18:01, Forrest Beck wrote:
> > I was just wondering what you all are doing for music on hold files
> > for best quality.  I am not much of an expert on sound rates, bits,
> > stereo, mono, tracks, and all that jazz.  Currently I am taking music
> > from a CD (our campus jazz band has recorded a CD), converting to WAV,
> > using Audacity to convert the stereo tracks into mono, drop the gain
> > to -15db, then I use sox to convert to GSM and 8 bit (by typing #>
> > /usr/bin/sox file1.wav -r 8000 -c1 file2.gsm resample -ql )
> >
> > The audio while on hold is OK.  I wonder if there is a way to get
> > better audio.  I noticed that asteriskguru.com has a audio conversion
> > on their website.
>
>Since telephones are so lo-fi, is there any reason to invest a lot of 
>energy
>in hi-fi hold music? .wav is uncompressed and lossless, so it should sound
>better than .gsm which is a lossy format. But I doubt anyone can really 
>tell
>the difference on a telephone. anyway, how long are you leaving your 
>callers
>on hold? :)

One item in my todo list is to make better sound quality whenever end point 
supports it.  Wide-band codec's can already produce better sound than toll.  
So why do we still need to convert to 8 bit?

Yuan Liu

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