[DECtalk] Speak windows older than 4.3
FRIDO ORDEMANN
enablerehab at verizon.net
Wed May 18 12:13:22 EDT 2011
THANK YOU, Ed - wonderful explanations!!
________________________________
From: ebruckert Bruckert <edbruckert at gmail.com>
To: DECtalk Discussions <dectalk at bluegrasspals.com>
Sent: Wed, May 18, 2011 10:01:33 AM
Subject: Re: [DECtalk] Speak windows older than 4.3
A short DECtalk history lesson of sorts. The commercial availability of the
first signal processing chip by TI finally made the large compute requirements
of the vocal track model possible. It was specifically designed to do difference
equations which is what the filters need doing lots of multiplies. So DECtalk
was confined to hardware only solutions until the power of the PC got sufficient
to be able to do the computes in real time. Back in the days the Dennis and I
worked on DECtalk took 30 min. of computer time on a VAX to generate one minute
of speech. That's why the first PC product was a hardware product because it had
to have the signal processing chip.
The speak program has never really changed I've used the same one basically
forever. It uses simple calls to the dapi which is the DECtalk application
interface. All programs had their own application interface until the advent of
SAPI. SAPI simply converts a standardized set of synthesizer calls in to dapi
calls to perform the same function. That is why the speak source code has always
been public domain and hasn't changed much, I can't remember if any versions of
speak only work with a certain version of DECtalk but if that occurred it was a
long time ago and I can't remember.
On Tue, May 17, 2011 at 6:52 PM, Jayson Smith <ratguy at insightbb.com> wrote:
Hi,
>
>Corine, Snoopi or Ed are probably the only ones who would even know if such
>a thing ever existed. Were there ever Windows-based Speak windows for any
>DECtalk version older than 4.3? Also, back before Windows Speak windows, was
>DECtalk marketed as a software product for Vax and/or other platforms, or
>just as a hardware product like the DTC01, DECtalk PC and PC2, and the
>DECtalk Express?
>Thanks.
>Jayson
>
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