[PLUG] Smoothing audio

Roderick A. Anderson raanders at acm.org
Wed Apr 30 15:04:39 UTC 2008


Quentin Hartman wrote:
> On Tue, Apr 29, 2008 at 9:36 AM, Roderick A. Anderson <raanders at acm.org>
> wrote:
> 
>> Thanks for the clue-stick tap.  :-)
> 
> 
> My pleasure. Clue-sticking is one of my favorite hobbies. :D
> 
> 
>>  I listened to the files again and
>> realized it was more a phone system issue.  Could be my home phone, cell
>> phone or maybe even the Asterisk box is causing the problems.  Most of
>> the choppy pieces were not so bad when played on my workstation.
> 
> 
> I presume that you are feeding the audio in from output on a sound card?
> Make sure the gain is not too high. If the bad parts tend to be at louder
> points or "s" or "t" sounds in the speech, your telephony card might be
> clipping due to too high volume. Does your analog interface card do any sort
> of audio processing in hardware? If so, try turning that on/off and see if
> it makes any difference. Finally, make sure whatever voice settings you are
> using are not producing any weird high or low-pitched tones. Phone systems
> are really only meant to carry frequencies found in normal speech, and
> adding frequencies outside of that range can sound really awful.

Actually they are generated from text files to .wav (8kHz) files then 
converted to .gsm.  I understand there are some setting I can tweak in 
Asterisk or during the conversion but haven't had a chance to get back 
to that.

I do want to experiment with Audacity and see what I can do when 
recording so these suggestions will help.  On the Asterisk box I'd 
prefer my messages in my voice but that requires a bit more patience 
than typing in the text, converting, listening and then fiddling with 
the text and repeat.


Rod
-- 
> 




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