[Freeswitch-users] Cepstral + FS question

[Malay Thakershi]

Thank you for your response.

By licenses, do you mean CPU license or Cepstral ports?

Say if I have 30 simultaneous calls (some part using direct WAV and some
using session speak), what algorithm I use to determine # or ports?

My server configuration:
Windows 2008 server 32-bit
4 GB RAM
Intel Xeon CPU X3220 @ 2.40GHz 2.40GHz

Malay


On Mon, Dec 13, 2010 at 8:55 AM, David Brazier <davidjbrazier at gmail.com>wrote:

> On Tue, Dec 7, 2010 at 12:38 AM, Malay Thakershi <mthakershi at gmail.com>
> wrote:
> > Hello, it would be great help if someone who has used Cepstral from FS
> can
> > share their views.
> > 1. I just have one Cepstral Allison voice license (1 port) on my FS
> server.
> > I use swift command to convert text files to WAV which are then played by
> > mod_managed in FS call process. First question is regarding limitations
> on
> > simultaneous conversions (TXT to WAV) using swift command. If I have
> > multiple threads doing this, will there be any degradation because of
> > Cepstral? I tried running two BAT files with 3 commands each. But running
> > them simultaneously or separate produced same outcome. Does anyone know
> when
> > Cepstral licensing kicks in and starts degrading quality ( or worse
> > inserting "not licensed") prompt?
>
> The synthesis via the swift command is much faster than real time
> (i.e. the time it takes to play the WAV) and is only restricted by CPU
> speed and licenses.  You'd need to ask Cepstral the details, but my
> simple tests have shown that it only uses one CPU per command though
> some of the processing of multiple command is on multiple CPUs.  But I
> think the licensing mechanism prevents multiple commands running
> completely simultaneously on multiple CPUs.  I think the "not
> licensed" speech is only inserted when you have no license at all -
> all that happens if you try to run multiple commands is that they are
> just delayed until  there is a free license.  I don't think quality
> will ever be degraded - it's just a question of CPUs and licenses that
> will determine your throughput.
>
> > 2. When I call session speak from mod_managed (or stream file) after
> > selecting Allison / Cepstral as my voice, does Cepstral engine interfere
> > with quality of the playback? If yes, when will I see it and how can I
> > produce their effects?
>
> Not unless something in Cepstral or FS is going badly wrong!
>
> > 3. What is the sensible number of ports (from Cepstral) I should be
> prepared
> > to buy if findings in the previous points imposes significant
> limitations?
>
> Depends on the length of your prompts and number and speed of CPUs and
> anticipated simultaneous calls.  Try testing the time for a typical
> prompt and work it out from there.
>
> David
>
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