[Asterisk-Users] English vs American voice files

[Bill Seddon]

Steve

Can you offer some recommendations regarding the sox arguments to use?  My
use of sox for down sampling is limited to this kind of command:

sox in.wav -r 8000 out.gsm

Are there other arguments that will give better sound from compressed
formats?

Thanks

Bill Seddon

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Steve
Underwood
Sent: September 20, 2004 2:33 PM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [Asterisk-Users] English vs American voice files

matt.riddell at sineapps.com wrote:

>On 20 Sep 2004 at 12:38, Andreas Sikkema wrote:
>
>  
>
>>asterisk-users-bounces at lists.digium.com wrote:
>>
>>    
>>
>>>Initially we recorded using 16 bit/8K sampling on the basis 
>>>that this is what is required by Asterisk but that was 
>>>really terrible.  So we're sampling at higher rates on
>>>the basis that we can use sox to change it as necessary.  Any
>>>thoughts on what we can do to make the recordings sound "sharper"?
>>>      
>>>
>>We've found that downbsampling with sox resulted in 
>>significantly lower quality files as those downsampled 
>>with Cool Edit.
>>    
>>
>
>Dithering in Cool Edit maybe?
>
>Matt Riddell
>  
>
sox offers several ways to change sampling rates. The poorest one is 
really quite poor. The best should not be distinguishable from any other 
good converter over a telecphone line. Dithering is completely 
irrelevant for telephony. It too  LoFi to notice. :-)

Regards,
Steve

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