Re: LF: TI-92 with sound...

Subject: Re: LF: TI-92 with sound...
From: Ilkka Sorsa <y95silso@kotakk.fi>
Date: Mon, 18 Nov 1996 12:50:38 +0200 (GMT+0200)
In-Reply-To: <961117221837_570714554@emout16.mail.aol.com>

On Sun, 17 Nov 1996 JWardell@aol.com wrote:

> In a message dated 11/17/96 7:34:24 PM, you wrote:
> 
> <<just to point somthing out... a computer speaker isnt analog.>>
> 
>   What are you talking about? All speakers are analog. The data is digital,
> there are D/A converters in your computer that output it to your audio out to
> make analog audio. If you hooked a speaker up to the digital data stream,
> well you wouldn't hear it because the pitch would be too high, probably for
> your speaker to even respond to let alone your ears.
>       -Josh

For example in normal ibm compatibles, that internal speaker is driven
with a purely digital signal. All digitized sounds played thru that kind
of speaker are done with some kind of pulse width modulation or something.
(Like in 1bit dacs in cd-players)
It would be easier to research possibilities of TI audio if someone made a
program which is capable of making different (adjustable) frequencies. If
there is no other possibilty than sending characters thru the port then
send character streams  with correct 'shape', like 01010101b, 00010001b
and others like that.. 

 -Ipe 
 [ http://www.kotakk.fi/~y95silso ]

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