A comparison circuit includes a differential amplifier having first and second input circuits each of which is formed of darlington-connected transistors and which are connected to receive first and second input signals. The comparison circuit further includes an operation mode control circuit for selectively short-circuiting the base-emitter path of each of the first stage bipolar transistors in the first and second input circuits, in response to the first and second input signals.

A method and device for the comparison of patterns, and especially of fingerprints, making possible the identification of a given person. The device comprises means for projecting an incoherent image of the finger to be compared onto a permanent fingerprint record, oscillating same with respect to each other, projecting the resulting image onto a photocell and ascertaining the A.C.-current characteristics of the resulting electrical signal. When the finger is positioned exactly, oscillation in o...

The invention contemplates an improved microscope having a partially transmitting mirror in the observation light path, the mirror deflecting some of the illuminating light path onto a first object, while a second object is located in the light path which passes through the mirror. In one form, the reflected and transmitted light paths are designed symmetrically, and each includes one microscope objective; one of these objectives is adapted to be inclined with respect to the direction of the lig...

In a comparison amplifier which comprises a differential amplifier stage for effecting differential amplification having two separate terminals to be supplied with two types of input signals and two input transistors connected to the respective terminals, and a constant current source stage for driving the differential amplifier stage so as to amplify a difference voltage between the afore-mentioned two types of input signals; the differential amplifier stage includes at least one constant curre...

A method of comparing a first representation of an identifier with a second representation of an identifier is provided. The method includes providing an expression of the first representation, such as a fingerprint, and considering the expression of the first representation against a probability distribution based on the variation in the expression between different example representations of the second representations, to provide a first consideration. The method also provided for considering ...

An analog input is compared with a comparison value by an analog comparator to set a comparison result register and comparison is automatically repeated until the value of the register coincides with the value of an expected value storing register. When the both values coincide with each other, an interrupt request signal is outputted and comparison is completed.

A comparison circuit which is both window addressable and content addressable, the circuit including comparison elements which include a pair of match transistors which isolate outputs indicating whether an input is not greater than stored data and whether an input is not less than stored data from an output indicating whether an input is equal to stored data.

A first visual image or other pattern (A) is represented by a first ordered set of elements (x.sub.i) each having a value and a second pattern (B) is a represented by a second ordered set of element (u.sub.i) each having a value. Iteratively, a comparison is made by: (i) selecting a plurality of elements from the first ordered set;(ii) for each selected element of the first ordered set, selecting an element from the second ordered set, such that the selected elements of the second ordered set ha...

A new comparison circuit is adapted to be connected in a row and column array for comparing words applied to the columns of the array with a sequence of words applied to the rows. Each comparison circuit has means for registering a match or a mismatch while corresponding bit positions of the words that are being compared are applied to the column input and the row input of the circuit. A comparison circuit includes means responsive to a match to transmit data from a row input to a column output....

A comparison amplifier includes a transistor whose emitter and base are fed with a comparison voltage and an input signal respectively and whose collector is connected to an output terminal. The emitter of the transistor is connected to signal ground through a diode whose capacitance is smaller than the base-emitter capacitance of the transistor.