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An armor with rollers is provided that enables a user to move in all positions by rolling on a hard and smooth surface while constantly varying his bearing points on the ground.
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| Number | Title | Issue Date |
| 5241561 | Radio receiver A radio receiver (16) for direct sequence spread spectrum signals incorporates a quadrature zero-IF architecture, means for comb filtering (36,37) the two quadrature related channels (I and Q) and a means of non-coherent demodulation of each channel; the ... | 08/31/1993 |
| 5228084 | Security apparatus and system for retail environments A gasoline service station includes gasoline dispensers and a PIN pad including keypads for receiving personal identification numbers and assembled into a network for securely communicating personal identification numbers from the PIN pads and dispensers ... | 07/13/1993 |
| 5204876 | Method and apparatus for providing high data rate traffic channels in a spread spectrum communication system A method and apparatus is provided for transmitting spread spectrum signals. The transmitter receives data bits at a particular rate. Subsequently, the transmitter encodes the received data bits at a predetermined encoding rate into data symbols. Subseque... | 04/20/1993 |
| 5199067 | Process for promotion of pay television broadcasts, and device for use of the process The process of the invention concerns pay television networks with reinforced scrambling. To attract potential subscribers, the invention consists in cyclically transmitting non-scrambled images for brief periods, so that the type of program can be seen.... | 03/30/1993 |
| 5194872 | Inertial navigation system with automatic redundancy and dynamic compensation of gyroscope drift error An inertial navigation system with automatic redundancy and dynamically calculated gyroscopic drift compensation utilizes three, two-degree of freedom gyroscopes arranged whereby any two of the gyroscopes form an orthogonal triad of measurement sensitive ... | 03/16/1993 |
| 5185793 | Method and apparatus for securing television signals using sideband interdiction A method and apparatus for securing a television transmission signal from unauthorized reception is disclosed that employs a sideband interdiction technique. A portion of the signal's sideband content is enhanced such that the signal is rendered useless f... | 02/09/1993 |
| 5177785 | Method and system for secure telecommunications There is disclosed a method and system for injecting a number of different signal patterns onto a tone encoded telecommunications line for the purpose of preventing unauthorized eavesdropping. The system relies upon the use of an unused column frequency o... | 01/05/1993 |
| 5173940 | Keyboard activated screen blanking A keyboard controller which scans entered input sequences for an input sequence to activate a display blanking feature. A password and particular hot key are loaded by the system microprocessor. The keyboard controller then scans until the designated sequ... | 12/22/1992 |
| 5170410 | Direct sequence spread spectrum digital communication system employing sequence changing during transmission and transmitter and receiver implementing same A digital signal receiver comprises receiver and demodulator means producing from the received signal a succession of complex elements. It produces sequences of successive complex elements consisting of conjugate elements of homologous elements used at th... | 12/08/1992 |
| 5170412 | Multiple access method In a multiple access method for the simultaneous exchange of several data streams ({B1,m }, {B2,m }, {B3,m }) among several participants of a transmission system, various data streams ({B1,m }, {B2,m ... | 12/08/1992 |
| 5168523 | Method of rotating a word constituted by binary elements and arrangement in which the said method is carried out A method of rotating a word constituted by binary elements b0 to bp-1 arranged from a position P(i) to a position P(i+p-1) in a global format containing p+n binary elements arranged according to the positions P(1) to P(p+n), which gl... | 12/01/1992 |
| 5166978 | Encoding system according to the so-called RSA method, by means of a microcontroller and arrangement implementing this system A digital message M is transformed by means of an operation to modulo-N exponentiate M by a number e all these numbers being large-length integers, having n bits, which uses a sequence of two successive operations, the first in the form of: Bi ... | 11/24/1992 |
| 5164959 | Digital equalization method and apparatus A digital equalizer and equalization method for a spread spectrum communication link that has a dispersive channel and other systems that process signals having a sufficient degree of redundancy in time and/or phase. No training signal is required, except... | 11/17/1992 |
| 5164988 | Method to establish and enforce a network cryptographic security policy in a public key cryptosystem Device A in a public key cryptographic network will be constrained to continue to faithfully practice a security policy dictated by a network certification center, long after device A's public key PUMa has been certified. If device A alters its operations... | 11/17/1992 |
| 5163098 | System for preventing fraudulent use of credit card A credit card system uses an encryption algorithm to generate a first encoded text from the card number and a password supplied by the user. The card user is verified by comparison of the first encoded text with an encoded text recorded on the card. When ... | 11/10/1992 |
| 5161244 | Cryptographic system based on information difference The cryptographic system is comprised of two stations A and B in which a respective string SA and SB of digits is stored. In station A an error-control information string C is generated from string SA and transmitted to st... | 11/03/1992 |
| 5157688 | Spread spectrum transmitter for degrading spread spectrum feature detectors A spread spectrum transmitter uses simultaneous pseudorandom shifts of the transmitted carrier phase and receive local oscillator phases by 90 or 45 degrees and/or pseudorandom time shifts of the transmitted and receiver chip timing by half a chip duratio... | 10/20/1992 |
| 5157687 | Packet data communication network A packet data transmission system is used to link a number of remote hand-held data-gathering units such as bar code readers to a central computer which maintains a database management system. Data packets are sent from the remote units by an RF link to i... | 10/20/1992 |
| 5153917 | Communication terminal system The invention provides an improved communication terminal system which basically works only in an on-line state, that is, when it is connected with a host computer; but, which is also workable for a pre-determined time period even in an off-line state. Th... | 10/06/1992 |
| 5153918 | Security system for data communications A modem security communication system for providing access to a computer system having a host computer and a central access controller located at a host location, and user terminals with transponders at a plurality of remote locations. The modem security ... | 10/06/1992 |
| 5151938 | Security enhancement in a data processor through use of dynamic parameter authentication A descrambler for descrambling scrambled information signals through use of a predetermined decryption key. The processing means are adapted for processing data in accordance with a number of different data processing routines to descramble said scrambled... | 09/29/1992 |
| 5151919 | CDMA subtractive demodulation Substractive CDMA demodulation optimally decodes a coded information signal embedded in may other overlapping signals making up a received, composite signal. A radio receiver correlates a unique code corresponding to the desired signal to be decoded with ... | 09/29/1992 |
| 5150408 | Key distribution communication system This method of key distribution locates (401,501) an individual communication unit (107) within an encrypted communication system with over-the-channel rekeying and then rekeys (415, 515) the unit. The method uses a key management controller (101) to mana... | 09/22/1992 |
| 5150377 | Direct sequence spread spectrum (DSSS) communications system with frequency modulation utilized to achieve spectral spreading Hardware complexity of transmitting and receiving equipment in a CDMA (Code Division Multple Access) cellular radio transmission system, embodying the principles of the invention, is reduced by the use of frequency modulation (FM) techniques to achieve sp... | 09/22/1992 |
| 5150412 | Security module for radio telephone A security module for a radio telephone prevents a KEY code stored in a non-volatile memory from being read out for illicit use. The security module deletes the KEY code stored in the memory when accessed from the outside. Hence, although a KEY code can b... | 09/22/1992 |
| 5150407 | Secured data storage devices A device for storing user data and a value representative of the time of storage is disclosed, which includes physically separating portions of an encryption key, combining a time stamp with user data, and using the restored encryption key to encrypt and ... | 09/22/1992 |
| 5150409 | Device for the identification of messages An apparatus and a method for the identification and encrypting/decrypting of messages permits converting an input message provided as characters, in character-by-character fashion and depending on preceding characters, to form an output message. An addre... | 09/22/1992 |
| 5148481 | Transaction system security method and apparatus An improved security system is disclosed which uses an IC card to enhance the security functions involving component authentication, user verification, user authorization and access control, protection of message secrecy and integrity, management of crypt... | 09/15/1992 |
| 5146499 | Data processing system comprising authentification means viz a viz a smart card, an electronic circuit for use in such system, and a procedure for implementing such authentification Authentication of a smart card is accomplished utilizing a microcomputer (PC) provided with an internal reader (RD) and an electronic circuit (3) linked to the PC. The circuit (3) includes a microprocessor (MP) capable of generating a random factor (RN). ... | 09/08/1992 |
| 5146495 | Circuit and method for maintaining security of video tape using privacy number A circuit for maintaining security of a video tape using a privacy number, including a sensing circuit for sensing lead tape portions of the video tape and producing a desired signal in accordance with the sensed result, a microcomputer for producing a de... | 09/08/1992 |
| 5146471 | Correlator for spread spectrum communications systems An improved correlator for use in a spread spectrum communications system which operates with a predetermined chip sequence includes an N-stage correlation register, wherein each stage corresponds to a signal chip in the sequence, an a means for autocorre... | 09/08/1992 |
| 5146228 | Coherent correlation addition for increasing match information in scene matching navigation systems A method and apparatus are described for image matching, particularly for increasing match information in scene matching navigation systems. The invention correlates a sequence of sensed images with a reference map and stores the resultant correlation sur... | 09/08/1992 |
| 5144641 | Spread spectrum communication device A multiplex communication device by the spread spectrum communication system is disclosed, in which a reference signal and a plurality of information signals are multiplexed to be transmitted after having spreading-modulated each of them, and data demodul... | 09/01/1992 |
| 5144660 | Securing a computer against undesired write operations to or read operations from a mass storage device A method of protecting a computer against "trojan" or "virus" programs is disclosed. A device 24 is connected in the bus between the disk controller card 16 and the disk drive 14 of the computer. The device monitors the bus and alerts the user when any il... | 09/01/1992 |
| 5144658 | Repeater of digital audio interface signal A digital audio interface signal repeater capable of displaying how many generations a further copying of a digital audio interface signal is allowed includes: a receiving device for receiving a digital audio interface signal, a demodulator for demodulati... | 09/01/1992 |
| 5144668 | Signal overlap detection in a communication system In frequency-hopping spread-spectrum systems, it is necessary to maintain frequency and bit synchronization (sync) between the transmitter and receiver in order to maintain quality data recovery at the receiver. Two transmissions in adjacent hop-time inte... | 09/01/1992 |
| 5144639 | Spread-spectrum communication system A spread-spectrum communication system uses a PN code which ensures that the side lobe of a self-correlation function represents zero on both parts of a sender and a receiver.... | 09/01/1992 |
| 5144640 | Correlation device for spectrum spread communication A correlation device for spectrum spread communication capable of being simplified in construction and carrying out high speed synchronism. The correlation device includes a code inversion device in place of a multiplier and a cumulative adder constituted... | 09/01/1992 |
| 5144662 | Public communication system comprising distributed stations, and station and sub-station for use in such a communication system A public communication system for encrypted audio/video information has various selective entitlement organizations with respect to its distributed receiver station. Such receiver station comprises one or more receiver sub-stations for decrypting the rece... | 09/01/1992 |
| 5142550 | Packet data communication system A packet data transmission system is used to link a number of remote hand-held data-gathering units such as bar code readers to a central computer which maintains a database management system. Data packets are sent from the remote units by an RF link to i... | 08/25/1992 |
