v097pba8@ubvmsd.cc.buffalo.edu (Ken F Morton) (04/13/91)
I think I've asked this before, but what is the playback resolution of the ensoniq chip? I think it is 8bit, but I'm hoping I'm wrong. Any software tricks to make the output psuedo-16 bit (like sampling at 16 and the messing with more than one sound generator pair...). Anyway, my thought was to use the GS as a Video sound production workstation (a very limited one). Stripe the video tape with SMPTE, use a SMPTE to MIDI converter to a GS midi interface, and trigger the playing of samples from the GS. Along with playing a MIDI sequence at the same time, this could be very powerful. Sorta like a cheap version of Opcode's Studio Vision. If the GS output is 8 bit then it might not be up to the quailty I'd like. What do you people think? oh yeah, is it possible to de-multiplex more than two channels of sound from the GS? I think I read somewhere that it is possible... thanks... Ken Morton "A vacant engineer rides on a v097pba8@ubvms.Bitnet train of thought that will not v097pba8@ubvmsd.cc.buffalo.edu lead him home" - Edie Brickell
toddpw@nntp-server.caltech.edu (Todd P. Whitesel) (04/13/91)
v097pba8@ubvmsd.cc.buffalo.edu (Ken F Morton) writes: > I think I've asked this before, but what is the playback resolution >of the ensoniq chip? I think it is 8bit, but I'm hoping I'm wrong. Any >software tricks to make the output psuedo-16 bit (like sampling at 16 and the >messing with more than one sound generator pair...). Here's the deal: 32 oscillators, each reads 8 bit sound data and pumps it through its own 8-bit volume setting. You could fake 15 bit sound by having 7 oscillators with powers of 2 in their volume settings, and updating them REALLY FAST. I'd have to look at it a bit more but I don't think you can do it without sucking up all of the CPU time while the sound is playing -- sorta like 3200 color pictures. >oh yeah, is it possible to de-multiplex more than two channels of sound >from the GS? I think I read somewhere that it is possible... Sure, the DOC supports 16 but Apple's connector on the motherboard only supports 8 (big deal, the stereo cards only use 2). What happens is a binary channel number shows up with a clock signal, and you are supposed to Sample&Hold the analog output into the specified channel as long as you can (never more than 38 uS if a sound is playing). There was a card that did 8 outputs, but I never saw it advertised anywhere. Todd Whitesel toddpw @ tybalt.caltech.edu
MQUINN@UTCVM.BITNET (04/13/91)
On Fri, 12 Apr 91 20:01:59 GMT <info-apple-request@APPLE.COM> said: > I think I've asked this before, but what is the playback resolution >of the ensoniq chip? I think it is 8bit, but I'm hoping I'm wrong. Any >software tricks to make the output psuedo-16 bit (like sampling at 16 and the >messing with more than one sound generator pair...). The VOLUME resolution is 8 bits... I don't know if it's possible to do psuedo-16 bit volume. The PLAYBACK resolution is 46720 Hz, or at least, that's the maximum rate the Sonic Blaster Software will let you play a sample back. I can't find the actual maximum limit in any of my books. >oh yeah, is it possible to de-multiplex more than two channels of sound >from the GS? I think I read somewhere that it is possible... It's possible to de-multiplex up to 8 channels. The address of the current channel can be found on pins 4,5, & 7 of the 7 pin Molex connector on the front right corner on the GS motherboard. Pin 6 is is the channel address strobe. >Ken Morton "A vacant engineer rides on a >v097pba8@ubvms.Bitnet train of thought that will not >v097pba8@ubvmsd.cc.buffalo.edu lead him home" - Edie Brickell ---------------------------------------- BITNET-- mquinn@utcvm <------------send files here pro-line-- mquinn@pro-gsplus.cts.com
THINGVOL@LAX.WISC.EDU (04/13/91)
You can have up to eight channels of sound depending on the demultiplexers
you have and the way you set them up. Last night, I spent some time looking
over a demultiplexer circuit, trying to figure out how to get eight channels
with the minimum amount of chips. When you figure eight channels, that is
eight amplified speakers you have to set up, so I stayed with just four
channels.
Daniel Thingvold thingvol@lax.wisc.edu Bob's Butchering and Hairstyle Salon
@uwlax.bitnet We give you the cuts you want