Just some remarks...
The key-click is very useable if you are able to send data to it at a very high
samplerate.
Just generate a pulse width modulated signal with a low pass filter on the output. I
guess
there is already one there.
Only problem is the frequency you have to do it at. The Z80 is not capable to do it
with
a good quality, even the R800 is unuseable for it.
The MSX-Audio is not only capeable to play 4-bit ad-pcm automaticly, but this can be
done for 8 bit pcm is too. Not many people have used this feature, takes two times
more memory for the same time and samplerate. (PCM is better than ADPCM)
About the MoonSound : I don't know how you could send PCM data to it without using
a wave. It could be I have overlooked this feature in the OPL-4 datasheet.
You could also play samples using a SCC.
Greetings from Erik Maas
----------
From: Laurens Holst
Sent: Monday, June 22, 1998 11:28 AM
To: MSX mailinglist
Subject: A question about the PSG & samples
--- I replied to a message in the newsgroup, but I'll post it here too. ---
jrh heeft geschreven in bericht <6min86$h77$[EMAIL PROTECTED]>...
:You don't need any noise emulation, in fact on a real MSX both tone and
:noise generators
:are shut down when speach (or other digital sound) is generated.
:But then...there are several ways to Rome;
:the key-click can be used to...
Yup, I have a question about that.
On the FM-pak, it's possible to play 4-bit (PCM) samples manually,
the MSX-audio can play up till 13-bit samples manually and 4-bit ADPCM
automatically,
the MoonSound can play samples up to 16-bit automatical and manually (?),
and finally, SIMPL (Covox) can play 8-bit samples manually.
I'm busy writing a driver to play -in theory- any kind of samples
(frequency/nr. of bits) for these devices, for I need a decent driver for
the samples in my game in development.
Anyway, I'd like to have the possibility to play the samples on the PSG too.
I knew it was possible, for some games use(d) voices, like in Snake-it and
Oh-shit. Also, there is some sample-player which can play samples via the
Covox and via the "monitor". I guess that "monitor" is generated via the
PSG, and I've heard rumours about the PSG being able of replaying 4-bit
samples. Now my question:
=== How to replay samples via the PSG??? ===
Or what else do I have to use. The key-click? The key-click would generate a
1-bit sample... not really good. Even on a high frequenty.
Well, that's my question, actually.
~Grauw
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