[Freeswitch-users] Cepstral + FS question

[David Brazier]

I meant Cepstral ports.  You might be better asking Cepstral for guidance.

On Mon, Dec 13, 2010 at 5:32 PM, Malay Thakershi <mthakershi at gmail.com> wrote:
> 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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