[Asterisk-Users] Sound files quality and volume

[Anton Krall]

I tried using sox -v but not any noticable change. 

You mentioned I can use wavs for voice prompts (playback and background)
instead of gsm? If this is the case, I do have normalize here so that can be
used.

What I I mean for bad quality is a hissing noise on recordings but
surprisingly enough, the default samples sound quite good for gsm so.. Whats
the catch? 

Wavepad is a windows app that can save directly to gsm.. But once again, I
guess Ill go with wav if playback and background can support it
 

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Steven
Critchfield
Sent: Miércoles, 23 de Febrero de 2005 04:24 p.m.
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [Asterisk-Users] Sound files quality and volume

On Wed, 2005-02-23 at 16:11 -0600, Anton Krall wrote:
> I just noticed that quality of .gsm files for using with asterisk is 
> not that good.. is there any way to make then sound better? asterisks 
> sample voices sound way better than theones recorded using 
> applications like wavepad or with asterisk like unavailable 
> messages... any tips? Do you know the command line for sox to adjust 
> the volumen levels or gsm files (make the louder)?
>  
> Also, do they have to be .gsm?
>  

I'm assuming wavepad is an audio editor. If you don't like the sound volume,
you need to either increase it when recording or you can attempt to shift
the audio up with your audio editor. 

As for sox, that is exactly what man is for. I think there is simple volume
changes that can be made with the -v flag. If you want it raised without
distorting, before you convert to gsm, use normalize on the wav file.
Afterwords use soxx to convert to gsm, or then again, if it is on your
machine and is unlikely to be transfered, don't use gsm, use wav.
The difference is you won't introduce any compression artifacts into the
audio quality. 

If you don't like the quality of audio when recording with wav settings
using asterisk, maybe you need a better phone or to just get used to what
you actually sound like when your voice traverses the phone systems.  
--
Steven Critchfield <critch at basesys.com>

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