Boots – shoes – and leggings
Patent
1981-08-07
1985-05-21
Gruber, Felix D.
Boots, shoes, and leggings
364824, G06G 900, H03K 1914
Patent
active
045190461
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention concerns signal processors. In a particular application, it concerns correlators and auto-correlators which use an array of light emitting or light modulating elements operating as "EXCLUSIVE OR" or "NEGATED-EXCLUSIVE-OR" logic elements, the optical output from such an array being processed to provide correlation information.
BACKGROUND ART
The technique of one-bit digital processing is a well-accepted tool of science. For example, its implementation in radio astronomy spectroscopy was described by B. F. C. Cooper in his paper entitled "Autocorrelation Spectrometers", which was published in "Methods of Experimental Physics", Volume 12, Part B, Edited by M. L. Meeks (Academic Press, 1976), pages 289-298. Various forms of correlator have been produced for such correlation. These have up to several thousand channels and clock rates up to several tens of megahertz. Larger and faster correlators are not produced, however, for with prior art components and arrangements, the larger correlators are found to possess inherent disadvantages in timing accuracy, bulk size and power dissipation.
SUMMARY OF THE INVENTION
One object of the present invention is the provision of means whereby one-bit correlators which may be constructed so that they are large, fast, and without severe heat dissipation problems. Another objective is the provision of one-bit correlators which are simple to construct, and which can be made large in terms of number of channels, yet compact and with low power dissipation.
These objectives are achieved by the construction of correlators using what has been termed by the present inventor a "light panel". The light panel is an array of light emitting or light modulating elements arranged in matrix form, operating as "EXCLUSIVE OR" ("XOR") or "NEGATED-EXCLUSIVE-OR" ("NEXOR") logic elements. The optical output from the elements of the light panel are processed by optical means, such as a complementary array of photodiodes.
According to the present invention, there is provided a correlator which comprises, in combination: being a device which changes from a first optical state to a second optical state when a voltage is applied across it, each element being adapted to receive two voltage signals, the optical state of each element at any instant being dependent on the relative values of the voltage signals; and receive light from a respective one of said light emitting or light modulating elements.
If the array is a linear array, the correlator may be used as an autocorrelator, as will be shown below. For purposes other than autocorrelation of a signal, the array will usually be in the form of a two-dimensional array. Each light emitting or light modulating element may conveniently be a light emitting diode device and series resistor combination, a neon-discharge or other plasma-discharge lamp (preferably with a series current-limiting capacitor or resistor), a liquid crystal, a deuterated potassium di-hydrogen phosphate (DKDP) or other Pockel's effect device, a vacuum fluorescent device, an electroluminescent device, or any other suitable device having the appropriate properties.
If, as indicated above, the array of light emitting or light modulating elements is a one-dimensional array (usually a linear array), and one of the signals applied to the elements is common and the other signals are the outputs of shift registers or delay lines to which the common signal source has also been connected, an autocorrelator is formed.
As also noted above, the present invention will provide larger one-bit correlators. In this case, the light emitting or light modulating elements of the array will be located at the cross-over points of a matrix formed by a plurality of linear electrical conductors, each conductor being insulated from each other conductor, the elements being connected across the conductors at the respective cross-over points.
The electrical conductors of such a light panel need not be formed as a rectangular matrix (though in practice this will often be the cas
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