gurney@cpsin2.uucp (Eddy J Gurney) (06/04/90)
Well, I'm glad to say I'm making some progress generating sound on the Mac -
Thanks mostly to a some suggestions and some very helpful sample code from
a couple of c.s.m.programmer's.
Basically, I've given up on using the Sound Manager, at least until I get
some sample code on how that works. (Does anyone know if the WaveFormSynth
is working on Mac Plus/SE's yet? If not, it's probably useless to me anyway.
I'm running a Mac IIcx, but I want my program to run on at LEAST a Plus and
an SE.)
So... I'm using the Sound Driver to generate the simple tones I need. I've
generated a really nice-sounding 256-byte sine-wave table, which I use as the
waveform for the FourToneSynth.
Then I use StartSound to produce a few tones in a row, and, whatdya know,
I get TONE*crackle*TONE*crackle*TONE*crackle*. (Sometimes. Other times it
sounds perfect.) IM II says something about getting rid of this, but I don't
quite understand how to do it correctly. At most I need three tones in a
row (I'm only using two of the four channels, BTW) - sometimes there will be
a rest between the tones, sometimes, their will be none.
Also, while I'm posting... has anybody come up with a way to specify a
FREQUENCY to FTSoundRec.sound1Rate instead of the rate? IM II gives the
equation:
frequency = FixMul(rate,FixRatio(22257,256))
I solved this for frequency, and got: (Actually, I had my HP-48SX do it. I
didn't want to be flamed for not solving correctly :-)
rate = FixRatio(frequency,FixRatio(22257,256))
Great you say, right? BUT: FixRatio only accepts INTEGER parameters, so the
second FixRatio calculation doesn't work. For now, I'm just using the integer
value '87', since (22257/256) = 86.94140625. Any ideas on how to make this
more exact? (Not that my application is that critical, I'm just curious :-)
Thanks for any help! (MacDTS: I anxiously await seeing "SoundApp" in the
Sample Code on 'apple.com'!)
--
Eddy J. Gurney, N8FPW -- gurney@frith.egr.msu.edu OR 17158EJG@MSU.BITNET
(reachable via uucp also)oster@well.sf.ca.us (David Phillip Oster) (06/07/90)
In article <1990Jun4.020601.9644@msuinfo.cl.msu.edu> gurney@cpsin2.uucp (Eddy J Gurney) writes: >Also, while I'm posting... has anybody come up with a way to specify a >FREQUENCY to FTSoundRec.sound1Rate instead of the rate? IM II gives the >equation: > frequency = FixMul(rate,FixRatio(22257,256)) >I solved this for frequency, and got: (Actually, I had my HP-48SX do it. I >didn't want to be flamed for not solving correctly :-) > rate = FixRatio(frequency,FixRatio(22257,256)) in floating point, this is: rate = frequency / (22257. / 256.); Or, in fixed point: rate = FixDiv(FixRatio(frequency, 1), FixRatio(22257,256)) If the FixRatio(frequency, 1) offends you , you can also say: #define FIXED(f) ( ((long) (f)) << 16) and say FIXED(frequency) -- -- David Phillip Oster - Note new address. Old one has gone Bye Bye. -- oster@well.sf.ca.us = {backbone}!well!oster