Subject:
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Re: nxt + i2c sp03 Text-To-Speech?
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Newsgroups:
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lugnet.robotics.nxt
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Date:
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Tue, 5 Dec 2006 20:27:52 GMT
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Viewed:
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14292 times
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In lugnet.robotics.nxt, Chris Phillips wrote:
> In lugnet.robotics.nxt, Tony Buser wrote:
> > On 12/5/06, Dick Swan <dickswan@sbcglobal.net> wrote:
> > > The NXT can also optionally apply 9V to I2C sensors on the same
> > > input/wire that is used for reading the analog values. There's a flag to
> > > set this up. I know it is accessible in RobotC and I think you should
> > > also be able to set it up via NBC.
> >
> > That would be the LOWSPEED_9V flag?
> >
> > > If you post the current draw on the TTS chip, likely someone will
> > > comment on a simple circuit for dropping the voltage.
> >
> > I just might do that.
> >
> > > I'd also do a little more searching for other TTS chips that might work
> > > on the lower voltage.. There was a nice article in either "Nuts and
> > > Volts" or "Servo" magazine sometime in the last year on a TTS chip
> >
> > The chip used in the book I have is the SpeakJet
> > http://www.acroname.com/robotics/parts/R225-SPEAKJET.html It's a LOT
> > cheaper than the sp03, however, it uses a serial interface and would
> > be a lot more complicated. I'd have to figure out a way to convert
> > the i2c signals into serial commands and it works by sending
> > allophones instead of arbitrary text. I did find a page that
> > describes a way to add i2c to it, but it's a little beyond my
> > understanding at the moment
> > http://www.modularsynthesis.com/modules/synthmodules/PSIM-SpeakJet/PSIM-speakjet.htm
> > That or preload phrases and use the digital inputs to trigger them,
> > neither of which would be as nice as just sending an i2c message to
> > say "Shall we play a game". Although I must admit, the speakjet can
> > output some pretty cool bleeps and blops sound effects like r2d2 and
> > overall has a cooler sounding retro robot voice. :)
>
> It sounds like the NXT probably doesn't have enough power available to run that
> chip, but you might look at using a BUC (Boost-Up Converter) component to bring
> the 4.3V supply up to a higher level? I've only been peripherally involved with
> projects using these, but BUC converters can efficiently step up a supply
> voltage to a higher voltage level at lower current levels.
>
> I also wonder whether you could accomplish text-to-speech entirely in software?
> I've seen TTS software that uses highly-compressed ADPCM phoneme samples to
> convert a stream of allophones into digital audio output. This would probably
> strain the memory resources on the NXT, and I don't really know how well this
> kind of thing would be supported without a firmware upgrade, but it sounds so
> crazy that it just might work.
There are chips available to convert ASCII text to allophones, although this
would increase the power requirements. One example:
http://www.speechchips.com/shop/item.asp?itemid=19
I actually used such a combination (many years ago) to build a simple speech
synthesizer board for my apple 2+. It produced very "roboty" speech which was a
bit hard to understand at times, but I'm guessing the synthesis chips have
improved quite a bit since then...
ROSCO
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Message is in Reply To:
 | | Re: nxt + i2c sp03 Text-To-Speech?
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| (...) It sounds like the NXT probably doesn't have enough power available to run that chip, but you might look at using a BUC (Boost-Up Converter) component to bring the 4.3V supply up to a higher level? I've only been peripherally involved with (...) (18 years ago, 5-Dec-06, to lugnet.robotics.nxt)
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