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| Number | Title | Issue Date |
| 5083293 | Prevention of alteration of data stored in secure integrated circuit chip memory An integrated circuit chip in which alteration of secure data stored in a predetermined location of a memory on the chip may be prevented. In one embodiment, the chip includes a memory having a plurality of memory locations, with a predetermined location ... | 01/21/1992 |
| 5081680 | Initial reporting of remotely generated data A device for reporting remotely stored data is coupled to a descrambler in an impulse pay-per-view television system for storing and reporting data pertaining to subject matter descrambled by the descrambler, such as identification of each impulse pay-per... | 01/14/1992 |
| 5068729 | Compatible extended-definition television A wide-aspect-ratio television signal is encoded for transmission within a standard-television-signal-compatible format is encoded by dividing the television signal into center-panel segments from which the horizontally central portion of a television pic... | 11/26/1991 |
| 5054067 | Block-cipher cryptographic device based upon a pseudorandom nonlinear sequence generator A block-cipher cryptographic device that processes plaintext/encrypted input data with a key signal to provide encrypted/decrypoted output data. Such device includes a shift register for receiving input data; and data processing means for executing the fo... | 10/01/1991 |
| 5053992 | Prevention of inspection of secret data stored in encapsulated integrated circuit chip An integrated circuit chip includes a secure memory element that stores secret data, an opaque layer of material encapsulating the chip, and means for eliminating the secret data from the secure memory element in the event that the encapsulation material ... | 10/01/1991 |
| 5053786 | Broadband directional antenna A broadband antenna includes a center fed active radiating/receiving element formed of two contiguous conductive spirals. The two planar antenna spirals are secured to a cavity loaded with a wave absorbing lossy material such that the antenna is operative... | 10/01/1991 |
| 5046093 | CATV subscriber apparatus with intelligent remote control Subscriber apparatus for a cable television system or the like comprises a converter/descrambler and a programmable remote control. All authorization data for premium services and features a subscriber is entitled to receive are stored in the remote contr... | 09/03/1991 |
| 5046138 | Self-aligning analog laser transmitter Apparatus and a method are provided for aligning an analog laser transmitter. Operational characteristics of the laser are determined. These characteristics are used to derive the power level required of a communication signal to properly modulate the las... | 09/03/1991 |
| 5038402 | Apparatus and method for providing digital audio in the FM broadcast band Method and apparatus are provided for transmitting, receiving, and reproducing digital audio signals as discrete carriers similar to standard FM broadcast signals. An audio signal is digitized using, for example, adaptive delta modulation techniques. Seve... | 08/06/1991 |
| 5036291 | On channel agile FM demodulator An on channel frequency agile PLL demodulator is provided using a precise and stable oscillator, such as a VCXO having its output frequency variable over a limited range. The output of the oscillator is multiplied by a multiplication factor to produce a m... | 07/30/1991 |
| 5036537 | Geographic black-out method for direct broadcast satellite system Television programs are broadcast to a plurality of receiver units in various geographic areas. Each unit has a memory for storage of a designation code representative of its location and a memory for the storage of a blackout tier indication. Prior to th... | 07/30/1991 |
| 5032807 | Notch filter using helical transmission line and coaxial capacitor A notch filter comprises a helical transmission line enclosed in a conductive activity, and a high Q capacitor coupled to form a series-resonant circuit. The capacitor is fabricated from a portion of coaxial cable having an outer conductor forming a first... | 07/16/1991 |
| 5027399 | Signal switching apparatus Apparatus is provided for switching traps in and out of a cable television signal path. A plurality of double pole double throw switches is connected in series with the signal path. Each switch has a first actuated position, a second actuated position, an... | 06/25/1991 |
| 5020129 | Addressable control system for CATV program distribution Remote control of subscriber access to premium programs on a cable television system or the like is provided. A signal path carriers program signals received from a cable television system. A switchable port coupled to the signal path is identified by a l... | 05/28/1991 |
| 5014310 | Video scrambling and descrambling by varying sequence of segments in adjacent video information lines A video scrambling system scrambles adjacent sequentially odd and even video information lines of a video frame by simultaneously storing in a memory a pair of such adjacent lines; and forming a pair of scrambled video information lines by retrieving from... | 05/07/1991 |
| 5003591 | Functionally modifiable cable television converter system A cable television converter with remotely modifiable functionality receives firmware downloaded over a cable television network. The integrity of the firmware is verified, and if valid, the firmware is executed to provide one or more converter functions.... | 03/26/1991 |
| 4998287 | Determination of sequential positions of video fields derived from film A system for determining the sequential position of video fields of a received video signal that was derived from a film having successive image frames in accordance with the 3:2 pulldown method, wherein the video fields are produced at a greater rate tha... | 03/05/1991 |
| 4989245 | Controlled authorization of descrambling of scrambled programs broadcast between different jurisdictions A control system and a corresponding method for controlling descrambling within a plurality of jurisdictions of scrambled programs broadcast from at least one of said jurisdictions. The control system includes a descrambler authorization system for each j... | 01/29/1991 |
| 4987476 | Brazed glass pre-passivated chip rectifier A semiconductor device is fabricated by applying a glass layer of material over a junction area of a semiconductor die. Aluminum metalization layers are applied to the top and bottom of the die at locations spaced from the glass and are used for a high te... | 01/22/1991 |
| 4982430 | Bootstrap channel security arrangement for communication network Apparatus and a method are disclosed to enable on-line modification and upgrading of terminal software in a communication network while maintaining the integrity of communication between a service provider and a subscriber using the network. Software is d... | 01/01/1991 |
| 4980315 | Method of making a passivated P-N junction in mesa semiconductor structure A process for forming a semiconductor device begins by diffusing an N layer having a relatively high concentration into a P wafer having a relatively low concentraton. Next, the wafer is etched to yield a plurality of mesa semiconductor structures, each h... | 12/25/1990 |
| 4979230 | Up-conversion homodyne receiver for cable television converter with frequency offset to avoid adjacent channel interference A carrier is received containing a plurality of signals within a first frequency band, for example television signals within the cable television band. The signals are upconverted to a second frequency band above the first band wherein a selected one of t... | 12/18/1990 |
| 4975951 | IPPV programming distribution control system A distribution control system for controlling the distribution of scrambled impulse pay per view (IPPV) programming from a plurality of different IPPV programmers to a plurality of descramblers. The system includes a plurality of business data processing ... | 12/04/1990 |
| 4972390 | Stack driven flexural disc transducer The underwater sound projector includes a hollow-cylindrical metal housing having a recess with an opening. A non-ceramic flexural disc is supported over the opening. Within the recess is a stack of piezoelectric ring elements. A metal drive head transfer... | 11/20/1990 |
| 4956862 | Method of providing sound privacy system compatible with mono and btsc stereo audio In order to provide secure access to the audio portion of a television signal, the audio portion of a TV signal is modulated at a frequency that is offset from the standard carrier frequency. In the embodiment disclosed herein, the audio portion of the TV... | 09/11/1990 |
| 4942139 | Method of fabricating a brazed glass pre-passivated chip rectifier A semiconductor device is fabricated by applying a glass layer of material over a junction area of a semiconductor die. Aluminum metalization layers are applied to the top and bottom of the die at locations spaced from the glass and are used for a high te... | 07/17/1990 |
| 4937811 | Communication network A communication network is provided for transmitting data in a hostile electromagnetic environment. Master and slave units are coupled to a data path by transformer coupling. The slave units can be turned on by applying a DC voltage between transfomer tap... | 06/26/1990 |
| 4933898 | Secure integrated circuit chip with conductive shield An integrated circuit chip containing a secure area in which secure data is processed and/or stored, includes a semiconductive layer containing diffusions defining circuit element components; a first conductive layer coupled to the semiconductive layer to... | 06/12/1990 |
| 4929987 | Method for setting the threshold voltage of a power mosfet A wafer with a orientation comprises N layer (middle layer) and a lightly doped P layer (top layer). A strongly doped N layer (source layer) is diffused into most of the top layer. An oxide layer is grown. A V groove with a flat bottom is anisotropi... | 05/29/1990 |
| 4928309 | Method and apparatus for descrambling a television signal A baseband television signal having a video portion with a suppressed horizontal sync pulse is descrambled by using a variable attenuator. The attenuator shifts the level of predetermined portions of the signal to restore the suppressed horizontal sync pu... | 05/22/1990 |
| 4926477 | Cable television descrambler A descrambler for a scrambled channel having a suppressed horizontal synchronization pulse which scrambled channel is provided in a broadband cable television signal along with nonscrambled channels. A signal splitter receives the broadband CATV signal an... | 05/15/1990 |
| 4921158 | Brazing material A mechanical and electrical bond between a silicon semiconductor wafer and a molybdenum contact is created by a multi-layer brazing material. The material includes adjacent layers of titanium and silver along with a layer which is either composed of alumi... | 05/01/1990 |
| 4920566 | Dual loop sinewave descrambler and method of descrambling A method and apparatus are provided for descrambling a sinewave scrambled television signal. The television signal is applied to a dual loop circuit that detects AM sinewave modulation on the television signal sound carrier. The detected modulation is app... | 04/24/1990 |
| 4914695 | Method and apparatus for frequency control of multiple oscillators using a single frequency-locked-loop Frequency control of multiple oscillators using a single frequency locked loop is accomplished by a single frequency-control device that is time-shared with a plurality of voltage-controlled oscillators and selectively establishes a "desired" frequency fo... | 04/03/1990 |
| 4904610 | Wafer level process for fabricating passivated semiconductor devices A process for fabricating a multiplicity of semiconductor devices comprises the steps of applying electrodes to both faces of a semiconductor wafer, the mounting the semiconductor wafer to a substrate by means of an intervening layer of wax which bonds to... | 02/27/1990 |
| 4897854 | Alternate pulse inversion encoding scheme for serial data transmission A method is provided for encoding and decoding data to be transmitted over a communication network via transformer coupling. The data is pulse width modulated, and split into separate first and second data streams containing alternate pulses. The first da... | 01/30/1990 |
| 4891685 | Rectifying P-N junction having improved breakdown voltage characteristics and method for fabricating same A rectifier is fabricated from a P-N junction having a P-type semiconductor layer and an adjacent N-type semiconductor layer. A mesa structure is formed in at least one of said layers. Impurities are deposited at the top of the mesa to form a high concent... | 01/02/1990 |
| 4888592 | Satellite antenna alignment system A system for causing an antenna controller for a satellite antenna to determine the alignment position of the antenna for a given satellite, whereby antenna installation time may be substantially reduced when the alignment position of the antenna for a la... | 12/19/1989 |
| 4881125 | Progressive scan display of video derived from film A system for providing a progressive-scan video display signal from a received video signal derived from a film having successive image frames by producing odd and even video fields from each film frame, with the video fields being produced at a greater r... | 11/14/1989 |
| 4868579 | Reduced back lobe spiral antenna A ferrite sleeve placed about the cavity portion of an antenna reduces back lobe radiation without degrading the antenna's front hemisphere radiation pattern. The thickness of the ferrite sleeve is selected such that the sleeve highly attenuates the surfa... | 09/19/1989 |
