Did You Know...
...that to encourage use of his new invention, the shopping cart, market owner Sylvan Goldman hired fake shoppers to push the carts around his store in Oklahoma City? Seems his customers were reluctant to give up their hand-carried baskets.
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| Number | Title | Issue Date |
| 4661980 | Intercept resistant data transmission system A secure communication system, which may be safely used even in the prese of an enemy interceptor, includes a transmitter and a receiver. The transmitter comprises a first modulo-2 adder, having as one input a sequence of N-bit binary numbers. A first random ... | 04/28/1987 |
| 4644399 | Video/digital data multiplexer An apparatus and method is provided wherein a television signal being traitted may be modified by multiplexing in a digital information-bearing signal in a manner that binary pulses are encoded upon horizontal synchronizing pulse windows contained within... | 02/17/1987 |
| 4636358 | Concretization of high level radioactive source in marine sediment A concretized coating which encapsulates canisters of radioactive, heat-producing materials is caused to be formed by immersing said canister in a sea floor sedimentary layer, the sediment containing feldspathic material. The canister heats the surroundin... | 01/13/1987 |
| 4593637 | Combination frangible nose cap EMI shield An improved frangible nose cap is presented which in addition to providing echanical protection to the torpedo nose also provides electromagnetic interference (EMI) protection to the torpedo electronics systems. The improved nose cap is made up of a frangi... | 06/10/1986 |
| 4409262 | Fabrication of submicron-wide lines with shadow depositions A method of fabricating lines of submicron width, comprising the steps of: providing a substrate, depositing a first layer of metal upon the substrate; spinning a photoresist layer on the metal; patterning the photoresist layer; etching the metal to undercut the photore... | 10/11/1983 |
| 4394744 | Real-time amplitude histogram shaper A real-time amplitude histogram shaper transforms an input analog signal with a corresponding input amplitude histogram to an output signal with a specified output histogram. The histogram shaper comprises a histogram estimator, which estimates the amplit... | 07/19/1983 |
| 4355368 | Adaptive correlator A correlator which is capable of correlating two or more signals of unknown frequency and bandwidth receives inputs on each of two or more channels. For the case of a two-channel, or pairwise, correlator the two channels are designated a first channel and... | 10/19/1982 |
| 4347580 | Array convolver/correlator An array convolver and/or correlator comprises first and second two-dimennal shift registers defined by N rows and M columns, corresponding columns, the first, the second, etc., of the two registers being aligned. N and M are generally in the range of 4 ... | 08/31/1982 |
| 4334277 | High-accuracy multipliers using analog and digital components An apparatus multiplies two sequences of digital numbers ai and b.su, which may represent signal pulses of various amplitudes. A first plurality of t read-only memories (ROMs), have a common input adapted to receive the sequence of numbers a | 06/08/1982 |
| 4329651 | Chirp filters/signals A discrete chirp generator produces discrete chirp signals which correspond o either of two exponential functions, namely the functions exp [jπ(m2 +)/N] or exp (jπ[m(m+ଲ)+]/N), where m=0, 1, 2, . . . , M. Typically, M and N... | 05/11/1982 |
| 4328554 | Programmable frequency synthesizer (PFS) A programmable frequency synthesizer (PFS) consists of three serially conted stages: an accumulator, a triangle converter, and a sine shaper. The accumulator is the frequency-generating stage of the synthesizer. It consists of an input latch to store the... | 05/04/1982 |
| 4291396 | Discrete amplitude shading for lobe-suppression in discrete array A discrete transducer array of a plurality of discrete transducer elements, o connected as to achieve a good array directivity pattern with as narrow a beam width as possible for a given side lobe level, or as low a side lobe level as possible for a given ... | 09/22/1981 |
| 4282579 | Discrete Fourier transform system using the dual chirp-Z transform A transform system provides a real-time implementation of the discrete Foer transform (DFT) of length N, the system being useful in sonar and radar signal processing. The input signal gn, 0ࣘnࣘN-1, comprises a discrete signal, generally com... | 08/04/1981 |
| 4270025 | Sampled speech compression system A sampled speech compression and expansion system, for two-dimensional prssing of speech or other type of audio signal, comprises transmit/encode apparatus and receive/decode apparatus. The transmit/encode apparatus comprises a low-pass filter, adapted to ... | 05/26/1981 |
| 4267580 | CCD Analog and digital correlators A charge-coupled device (CCD) analog and digital correlator comprises identical modules, each of which is a simple analog CCD correlator with digital input and output. Circuits are included: (1) for injecting charges proportional to the voltage sequences s(n) ... | 05/12/1981 |
| 4254417 | Beamformer for arrays with rotational symmetry A frequency-domain beamformer is used with arrays comprising M rings with a maximum of N elements per ring, the positions of the elements having rotational symmetry. An element need not be present at each position. The outputs of each of the M rings of ar... | 03/03/1981 |
| 4243935 | Adaptive detector An adaptive detector comprises an adaptive linear prediction filter (ALPF) nd a detection processor. The adaptive filter comprises an input filter, adapted to receive an input signal x(k) and delay it by a time Ɗ. An L-point, or L-tap, adaptive filter has... | 01/06/1981 |
| 4238746 | Adaptive line enhancer An input signal X(j) is fed directly to the positive port of a summing function and is simultaneously fed through a parallel channel in which it is delayed, and passed through an adaptive linear transversal filter, the output being then subtracted from th... | 12/09/1980 |
| 4197529 | Intrusion detection apparatus A specially configured cable, which, in use, has a cross section which is mmetrical to a vertical line, but asymmetrical to a horizontal line, is used for an intrusion detection system. It comprises an external sheath, which may be round or rectangular in... | 04/08/1980 |
| 4196448 | TV bandwidth reduction system using a hybrid discrete cosine DPCM An image-compression system, wherein the image consists of a planar array of data points having various brightness levels, comprises a transmitter and a receiver. The transmitter comprises an analog-digital converter, for converting input analog data into... | 04/01/1980 |
| 4194171 | Zinc oxide on silicon device for parallel in, serial out, discrete fourier transform A material suitable for the propagation of acoustic waves on its surface prises a substrate of semiconductor material, of which there exists an oxide, excluding the class of piezoelectric materials, the substrate having at least one flat surface. A layer... | 03/18/1980 |
| 4187549 | Double precision residue combiners/coders Apparatus, useful in signal processing, and which can be used for modulo (2n -1) addition, subtraction, coding, and decoding, has a plurality of 2n input means: n means for receiving a signal I0, I1, . . . , In-1 | 02/05/1980 |
| 4164023 | Permutation memories A permutation memory comprises an input control means for decoding, having plurality L of inputs for an L-bit binary number, and a plurality 2L of outputs. Means are connected to the decoding means, for initiating the read-in of the L-bit numbe... | 08/07/1979 |
| 4161783 | Charge-coupled multiplying digital-to-analog converter A charge-coupled device (CCD) multiplying digital-to-analog converter mullies a bipolar analog signal, representing as a charge, by a digital word, and produces a four-quadrant analog product, also represented as a charge. An analog signal S is added to ... | 07/17/1979 |
| 4152772 | Apparatus for performing a discrete cosine transform of an input signal Apparatus for performing a discrete cosine transform of an input signal, table for real-time television image processing, specifically for obtaining an acceptable picture when the number of bits of information available for describing the picture and/or ... | 05/01/1979 |
| 4143400 | Real-time optical mapping system An optical system, to be used with an illuminating source, maps objects lted in an underwater environment. A first optical means is adapted to receive light from the illuminating source for transmitting the illumination to the object area to be mapped. A... | 03/06/1979 |
| 4138615 | Presettable integrating timing circuit A presettable integrating timing circuit is capable of comparing the timelt product of an input signal with a preset signal. Means, comprising an input and an output, integrate an electrical signal at the input into an integrated signal at the output. Me... | 02/06/1979 |
| 4109117 | Range division multiplexing An apparatus is capable of recovering signals from N sites, Nࣙ2, distributed along a single coaxial cable. This multiplexing technique allows the separation of signals from many transducers on one line. Time domain reflectometry (TDR) is used, with vari... | 08/22/1978 |
| 4105941 | Driver for reactive load An apparatus for driving a reactive load, comprises a plurality of N multnput elements N ࣙ 2, connected in parallel, capable of amplifying a band of frequencies. Two inputs of each element can be connected to sources of direct-current voltage. Each cir... | 08/08/1978 |
| 4100498 | Discrete chirp frequency synthesizer An automatic frequency-hop controller for a surface acoustic wave (SAW) shesizer is used with a means for generating two chirp signals, one having a delay with respect to the other. It comprises a SAW device, adapted to receive the chirp signals. The SAW... | 07/11/1978 |
| 4099148 | Transversal filter prime sequence frequency synthesizer A frequency synthesizer, for use with a means for generating two sequences of electrical pulses, one sequence having a delay with respect to the other, comprises a surface acoustic wave (SAW) device, adapted to receive one of the sequences of electrical p... | 07/04/1978 |
| 4068311 | Discrete transform systems using permuter memories High-speed, high-accuracy, apparatus for performing discrete Fourier and crete cosine transforms, suitable for signal processing applications. The apparatus includes a means for switching an input signal from a sample-and-hold circuit to a circuit which ... | 01/10/1978 |
| 4060850 | Beam former using bessel sequences A beam former, to be used with a circular array of N receiving elements, toreq.3, comprising a set of N discrete Fourier transform (DFT) devices, each one connected to one of the receiving elements, for taking a temporal discrete Fourier transform of the... | 11/29/1977 |
| 4055776 | CCD differential current apparatus An inductively coupled current apparatus for differential tap currents used n conjunction with charge coupled devices (CCDs) permits the current differences flowing in tapped clock lines of charge coupled devices to be conveniently measured.... | 10/25/1977 |
| 4054787 | Apparatus for computing an arithmetically accumulated sequence of numbers Apparatus for computing an arithmetically accumulated sequence of exponenantissa formatted numbers, which comprises write-in apparatus and read-out apparatus. The write-in apparatus comprises means for separating each of a sequence of numbers in exponent... | 10/18/1977 |
| 4053867 | Acoustic hologram reconstructor using surface acoustic wave devices This invention relates to an acoustical hologram reconstructor using surf acoustic wave (SAW) devices, which is a major part of apparatus which converts an acoustical hologram into a focused optical image, both having a magnitude and phase. The focused i... | 10/11/1977 |
| 4041284 | Signal processing devices using residue class arithmetic Apparatus for performing arithmetical calculations on a plurality, N, of ital input signals, utilizing residue class arithmetic, comprising a plurality N of means for coding the N input digital signals into digital modulo mi integers, Kࣘiࣙ... | 08/09/1977 |
| 4013967 | Mid-pulse detector Apparatus, in a receiver, for detecting the mid-pulse phase reversal of an nput signal s(t) = a(t)BLT cos (ω0 t + θ1). The signal a(t)BLT is a modulating signal a(t), having a phase-reversal at its midpoint, af... | 03/22/1977 |
| 4010360 | Carrier-compatible chirp-Z transform device A carrier-compatible device for computing the discrete Fourier transform of an input signal, using the chirp-Z transform (CZT) algorithm, comprising means for connecting to a real and imaginary part of an input signal gk. A pulse generator gene... | 03/01/1977 |
| 4005282 | Decometer A portable decompression computer, which is capable of providing a diver's current depth and safe-ascent depth, comprising a source of energy, for energizing various components of the computer. A micro processor is energized by the energy source. A clock ... | 01/25/1977 |
