Re: Echo II sound cards

["Bill Garber" <willy46pa@comcast DOT net>]

"Michael J. Mahon" <mjmahon@aol.com> wrote in message
20040326210838.08839.00000183@mb-m02.aol.com">news:20040326210838.08839.00000183@mb-m02.aol.com...
: Roy replied:
:
: >Michael J. Mahon wrote:
: >
: >> Bill Garber wrote:
: >>
: >>>"Exegete" <millers@noneofyourbusiness.com> wrote in message
: >>>news:406454e9$1_5@corp.newsgroups.com...
: >>>: They use a 6522 to address two AY-3-8913 chips.
: >>>: If memory serves, that chip has three "voices" and a
"white
: >>>noise"
: >>>: generator.
: >>>
: >>>Really?, I thought that was the Mockingboard.
: >>>I'm looking at an Echo IIb and it has none of
: >>>those chips. Of course I don't have a straight
: >>>Echo II so I can't really disagree.
: >>
: >>
: >> The Echo II has only the TI "Spean'n'Spell" synthesis chip,
: >> but can be used to play digitized sound and to make
non-speech
: >> sounds, within limits.
: >>
: >> The Echo II+ has both the TI chip and two AY-3-8910's for
: >> Mockingboard capability.  (I don't know whether it was
actually
: >> software compatible with the Mockingboard.)
: >
: >MIchael,
: >I hadn't noticed the TI chip.
: >If I'm reading it right, it's a TSP5220CNL
: >But there's also a TI SN74LS92N - I assume that's a logic chip
of some type.
:
: Yes, it's the 5220, a 600-mil-wide chip--24 pins or so,
:
: It was the first single-chip LPC (Linear Predictive Coding)
speech
: synthesis part.  It uses time-varying filters to simulate the
human
: vocal tract.
:
: It requires considerable computation to compute the filter
settings
: to create good speech, so this part of the job was done offline
with
: a mainframe (at the time).
:
: Although it is geared to producing noises made by the human
vocal
: tract, with proper filter coefficients it can be made to make
some
: pretty wierd noises--even wierder than some people can make.
;-)

Can it make the fart sound? No, seriously. Come on,
I mean it. Hey, I'm not joking around here. For real,
can it do it? And do you know the entry codes??

Bill @ GarberStreet Enterprizez };-)
Web Site - http://garberstreet.netfirms.com
Email - willy46pa @ comcast DOT net
Change DOT to a dot to contact me



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