Apparently-To: john.smith@gravis.com


GUS Musician's Digest       Tue, 21 Dec 93  2:55         Volume 3: Issue  20  

Today's Topics:
                    About those silly inverters...
                            Music Contest

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	- Meta-info about the GUS can be found at the end of the Digest.
	- Before you ask a question, please READ THE FAQ.

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Date: Tue, 21 Dec 93 1:55:37 MST
From: Steve "Bongos" Larson <larson@ee.ualberta.ca>
Subject: About those silly inverters...

FWIW,

# Date: Fri, 17 Dec 1993 21:55:53 +1100 (EST)
# From: Iain Huxley <ihuxley@ucc.su.OZ.AU>
# Subject: gus-midi connector --> why 2 inverters??
# 
# why would the circuit for a midi connector use 2 inverters?
# Is there some reason for this, or was it just designed by someone who 
# didn't know much about electronics?
# 
# I would have thought using a buffer (74LS241 will do, from memory) to rpl 
# the two inverters would be much better, since it would be faster!
# 
# any reason why this would not be the case?
# 
	=> On the contrary, that circuit designer porbably knew a LOT
	about electronics. You're correct, the buffer will do just that,
	quite often a signal needs to be delayed WRT another parallel
	signal, allowing the device to stablilize at a certain state
	(common in asynchronous circuits). Two inverters back to back
	like this effectively buffers *and* delays the signal. Hence,
	faster is not always better. Recall that the midi bit stream
	is the bottleneck, not the gates (~20nS).

Steve Larson, Computer Engineering, Univ. of Alberta
larson@bode.ee.ualberta.ca or larson@amisk.cs.ualberta.ca              

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Date: Mon, 20 Dec 1993 11:50:49 GMT
From: Clarke Brunt <CLARKE@lsl.co.uk>
Subject: Re: Music Contest

Funny sort of digital music contest when you can apparently
submit any sort of file except MID!

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End of GUS Musician's Digest V3 #20
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