Re: voice on phone problems

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From: William DePalo [MVP VC++] (willd.no.spam_at_mvps.org)
Date: 03/10/04 

Date: Wed, 10 Mar 2004 01:42:56 -0500

"kaku" <mhafizullahkhan@yahoo.com> wrote in message
news:Oo7GuImBEHA.684@tk2msftngp13.phx.gbl...
> i still cant figure it out. let me summarize again. I am developing an IVR
> application in VB6. I have done everything, the only problem is how i send
> voice to the caller. Basically, i want to convert text to speech and want
to
> send the speech to my modem. (actually to the caller). could anybody help
me
> out.

First, you need a text to speech engine and compatible voices. A good engine
in the enterprise class is not cheap. Google for Nuance, Scan Soft and ATT
Natural Voices. MS has a robotic sounding engine that uses its speech API
(SAPI) available for download at www.microsoft.com/speech . It supports only
English, Chinese and Japanese. Cepstral (www.cepstral.com) sells inexpensive
voices for desktop applications.

Then your application needs to marry three technologies, TAPI, SAPI and
multimedia. Assuming a TTS engine compatible with Win32, you'll need to use
TAPI to determine the line you answer the call on and then use lineGetID()
to get the multimedia device id of the speaker device used to stream audio
to caller. Then you'll need to use the Speech API (SAPI) to convert the text
to speech. The trick is that you need to point SAPI at the device id of the
speaker in the line.

If you have MS Speech SDK version 5.1 then search its help for the topic
"Speech Telephony Application Guide" which will explain what you need to do.

Don't get their .Net Speech Applications SDK (which is different) unless you
want to use ASP.Net, and their own speech and telephony servers which are
now in beta (general availability will be announced on the 24th).

Regards,
Will

Relevant Pages

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