farjamit@eecs.cs.pdx.edu (Tom Farjami) (04/07/91)
Greatings,
I am working on design and fabrication of a CMOS motion
detector IC that I have classified as being fuzzy. The fol-
lowing is a description of the circuit. It has 10 digital
inputs and a final output. A strong voltage on the output
(near VDD) means that majority of the inputs were fired in
the preferred direction, otherwise output is silent. There
is no feedbacks and therefor no neural-net like back props
in this circuit. It detects motion in real time; as long as
input signal is within few hundred to few kilo hertz. Cir-
cuit is biologically motivated and operates in subthreshold.
I have the following question,"Basically what are some
of the applications of this circuit in real life ?". I have
thought of waveform detection in scopes, pattern recognition
and even speech recognition myself. How would that be?.
Consider the following. If inputs of the motion detector
came from a set of comparators such that all of the compara-
tors were comparing the same analog input signal( say a
speech signal) against a constant (programmable) voltages.
That is each comparator has a different reference voltage
but takes in the same analog signal as other comparators do.
Now if the analog waveform matched the wright pattern in the
preferred direction ( which is basically what you programmed
the comparators with), motion detector will turn on and we
have pattern detection. Ofcourse for this I need more that
10 inputs, perhaps hundreds to give me high resolution and a
state machine plus a A/D converter to program my reference
voltages; but this can be.
I especially like to hear comments from those doing
speech and pattern recognition.
Regards,
Tom Farjami
Portland State University
April 6, 1991
--
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