In a searching for library documents that match the content of a given sequence of query words, a set of equivalent words are defined for each query word along with a corresponding word equivalence value assigned to each equivalent word. Target sequences of words in a library document which match the sequence of query words are located according to a set of matching criteria. The similarity value of each target sequence is evaluated as a function of the corresponding equivalence values of words ...

A preamble search and synchronizer circuit for detecting a preamble pattern within data input signals and synchronizing it with a clock signal associated with a StarLAN coded data transceiver includes a synchronizer start circuit, a counter circuit, and a pattern detector circuit. The synchronizer start circuit is responsive to the complement of the data input signals and the clock signal for generating a start signal which is synchronized with the clock signal. The counter circuit is responsive...

A special-purpose search processor, and a related method, for performing a variety of logically complex searches of a serial data stream in a highly concurrent fashion. The processor comprises a sequence of serially connected cells of identical construction, and the data stream is passed through the sequence of cells, each cell performing a logical operation based only on the data provided to it from the previous cell in the sequence. Each cell has a character register for data storage and a pat...

A received RF signal is mixed with the output of a voltage-controlled local oscillator to provide an IF signal which is simultaneously passed to a frequency discriminator and a circulating memory. Control voltage for the oscillator is provided by an AFC unit which comprises an integrator receiving selected contant voltage inputs. During the search mode a search ramp is generated by the integrator. A flyback circuit causes the search voltage to repeat its traverse over a prescribed range. Bipolar...

A device for detecting metal articles buried beneath the surface for example, includes a search coil at one end of a handle, with the handle carrying the detector circuit components. The search coil is an induction coil enclosed within an annular chamber formed from a plastic housing having the form of a spoked wheel for example, and which is formed from two mating housing halves joined in the plane of the coil chamber. The coil is made up of a number of turns of insulated wire wherein the insul...

A pulse radar equipment comprising a repeatedly triggered transmitter tube cooperating with antenna means for repeated transmission of radar pulses and receiver means for reception of echo pulses caused by energy reflected from targets in the direction of the transmitted pulses and further comprising a detector which is sensitive for absence of transmitted pulse after triggering of the tube or for a transmitted pulse having an amplitude below a given threshold level and adapted to block the rece...

An ultrasonic nondestructuve testing system and a search unit are disclosed herein. The search unit includes a transducer crystal for transmitting and receiving ultrasonic energy together with an acoustical backing structure which is disposed on the backside of the transducer crystal for dampening spurious ultrasonic energy radiated from its back-side. The backing structure includes compacted or pressed fibers of a dense, non-resonant material.

A character data search system which utilizes a plurality of small area scans which are located according to the probability that the field containing the desired information to be recognized is in a given location on the documents. Furthermore, the field is recognized by indicating key characteristics contained therein. The scanning of the field is of a multiple scan type and the scans may partially overlap each other depending upon the characteristics being searched for and the probability of ...

Radio receiving apparatus having an adjustable search tuner operable over a predetermined band of frequencies, and drive means for moving the tuner at a relatively slow rate for search tuning in one direction of travel, and at a relatively rapid rate for repositioning in the opposite direction. The drive means comprises a tuner drive shaft, a unidirectionally rotatable motor, a lever, and first and second solenoid means coupled with the lever, each selectively energizable to rock the lever in on...

The disclosure is directed to the mechanism for locating on, and reading out from, a flat disc record, by means of a pick-up needle, selected information which is recorded thereon. The overall controls for selecting and retrieving or reading out the desired parts of the recorded information, and for utilizing the information, are not a part of the present invention. The mechanism here disclosed and claimed is adapted to the performance, in sequence, of certain required mechanical operations and ...