| Patent Number |
Title Of Patent |
Date Issued |
| 6021185 |
Method and apparatus for processing and displaying videotext or telephone data |
February 1, 2000 |
| Videotext data or data transmitted through a telephone network is displayed by: receiving and decoding the data by a receiver/decoder device disposed in a television receiver, a video cassette recorder, or connected to the television receiver or the video cassette recorder; transmitting |
| 5953145 |
Multiple light path arrangement |
September 14, 1999 |
| The present invention relates to an arrangement for a multiple light path, which may be used for a wireless optical audio and/or video communication system.Known systems use a direct wireless infrared connection. It has been found that such a connection is not reliable enough. It is the |
| 5848028 |
Method and apparatus for synchronizing clocks coupled to network |
December 8, 1998 |
| Many devices (in particular white goods or brown goods) in a household may contain a clock. Some systems allow connection of such devices and their related clocks to a common bus or network. The commands for controlling the clocks are in general limited to reading or writing a given time |
| 5835864 |
Method and apparatus for customizing a device with a smart card |
November 10, 1998 |
| A device such as a pay TV decoder, a television receiver, a VCR or a remote control is automatically customized with information such as channel, frequency, and/or remote control codes that is stored in memory in a smart card. The smart card transmits the information to the device via a |
| 5825554 |
Lenses with a variable refraction index |
October 20, 1998 |
| A lens having a variable index of refraction and a point of symmetry is fabricated from a plurality of substantially identically shaped parts. Each of the parts is pyramidal in configuration and has a base and a plurality of sides extending from the base to an apex. Each of the parts |
| 5793430 |
Method and apparatus for correcting motion vectors |
August 11, 1998 |
| Motion vectors resulting from block matching are corrected for periodic structures by taking a more reliable vector from an edge of a moving object containing the periodic structure. This is done by calculating and comparing different error combinations to identify periodic structures an |
| 5752180 |
Converter for processing RF signals having different polarizations |
May 12, 1998 |
| A radio frequency converter includes a plurality of signal paths for simultaneously processing two RF signals in the same band but with different polarizations, each of which includes a mixer and an oscillator. A common resonator is connected to the frequency control terminal of each |
| 5734733 |
Television receiver with integrated speakers |
March 31, 1998 |
| This invention concerns a television receiver equipped with speakers fitted in a particular manner. The television receiver includes at least one speaker located at the bottom of a cavity in the outer surface of the case of said television receiver, this cavity being located in at least |
| 5726678 |
Signal disturbance reduction arrangement for a liquid crystal display |
March 10, 1998 |
| In an array of a liquid crystal display device having data lines and row select lines, a pair of conductors are provided in a direction transverse to that of the row select lines at opposite sides of the display device. The conductors are capacitively coupled to the row select lines. An |
| 5701136 |
Liquid crystal display driver with threshold voltage drift compensation |
December 23, 1997 |
| A shift register for scanning a liquid crystal display includes cascaded stages. A given stage is formed with an input transistor switch that is responsive to an output pulse of a stage upstream in the chain of the cascaded stages. An output pulse of the given stage is produced in a |
| 5686935 |
Data line drivers with column initialization transistor |
November 11, 1997 |
| A video display driver applies a video signal to column electrodes of a liquid crystal display. The display driver includes a reference ramp generator and column data line drivers. A reference ramp signal is combined with the video signal and applied to an input of a comparator. The |
| 5673063 |
Data line driver for applying brightness signals to a display |
September 30, 1997 |
| A video display driver applies a video signal to pixels arranged in columns and rows of a liquid crystal display. A given column or data line driver includes a field effect transistor that operates as a comparator. The comparator is responsive to the video signal and to a reference ramp |
| 5672940 |
Television power supply with polarity-independent charging paths |
September 30, 1997 |
| A television receiver has a switched mode power supply controller, which may be deflection synchronized, which produces pulses in a power transformer. To power the controller during startup, before the internal power supply has started, a storage capacitor on the power supply input of |
| 5670979 |
Data line drivers with common reference ramp display |
September 23, 1997 |
| A video display driver applies a video signal to column electrodes of a liquid crystal display. The display driver includes a reference ramp generator and column data line drivers. Each data line driver includes a switching arrangement coupled to a first capacitance for storing a portion |
| 5654891 |
Method and apparatus for controlling and/or limiting speed excess by drivers |
August 5, 1997 |
| Normally, speed control is carried out by police using radar and camera. The speed of a car can also be recorded in a tachograph. According to the invention car speed is controlled and/or limited using driver-specific smart-cards and millimeter wave communications. When a car (13) enters |
| 5654731 |
Shielded pixel structure for liquid crystal displays |
August 5, 1997 |
| A liquid crystal display device includes first and second transparent substrates spaced from one another and having facing surfaces with a liquid crystal material between the facing surfaces. A transparent electrode overlays the facing surface of one substrate. The facing surface of |
| 5642170 |
Method and apparatus for motion compensated interpolation of intermediate fields or frames |
June 24, 1997 |
| An appearance of a double image around moving objects may be reduced or removed by generating motion compensated 100 Hz fields with the objects in correct positions. When, however, the results of this technique are applied to motion compensated upconversion, objects or parts of the p |
| 5625368 |
Radiowave antenna system |
April 29, 1997 |
| An antenna system for receiving radiowaves includes a Lundeburg-type lens which reflects radiowaves to a focal point of the lens. A helical primary feed is located in the proximity of the focal point. Electronic circuitry for processing the radiowaves in a desired manner and the primary |
| 5621632 |
Switch mode power supply circuit |
April 15, 1997 |
| In a switch mode power supply of a video apparatus, a capacitor develops a supply voltage that is coupled to a main current conducting electrode of a driver transistor. The driver transistor drives a switching power transistor. An arrangement charges the charging capacitor when the video |
| 5610662 |
Method and apparatus for reducing conversion artifacts |
March 11, 1997 |
| When film is transmitted by television, the same frame of film is used to generate both interlace television fields. This results in the information carried by the second field being temporally displaced from the original by 20 ms. This displacement gives rise to judder and double image |
| 5600572 |
Method for transmission of variable-format images via low data rate transmission systems |
February 4, 1997 |
| The invention discloses a method for coding a video image on a pixel block basis in a transmission system including at least one transmitter and one receiver, where the video image is in one of several possible display formats. The method comprises:(a) defining a first image display form |
| 5600345 |
Amplifier with pixel voltage compensation for a display |
February 4, 1997 |
| A liquid crystal display includes pixels that are arranged in columns and rows. Data line drivers responsive to a video signal develop output signals in data lines that correspond with the columns, respectively. An adjustment data line driver is provided. The adjustment data line driver |
| 5561469 |
Auxiliary video data slicer with multi-mode peak detection for determining sync and data slicing |
October 1, 1996 |
| An auxiliary video data slicer for extracting auxiliary video information from a video signal includes a peak detector. The peak detector determines a peak amplitude of horizontal sync pulses that are included in the video signal and a peak amplitude of a run-in-clock (RIC) waveform that |
| 5546130 |
Method and apparatus for forming a video signal using motion estimation and signal paths with di |
August 13, 1996 |
| Motion compensated video output signal (SO) produced by a soft switching or "fading" (SSW) between the a motion compensated interpolation (MCI) and a "fallback" mode (FFI) (e.g., intra-field), controlled by a "measure of confidence" (CF) in the reliability of the estimated motion vector. |
| 5539773 |
Method and apparatus for ghost cancelling and/or equalizing |
July 23, 1996 |
| A method for signal equalization/ghost cancellation with an equalizing filter includes synthesizing a first equalizing filter function (LMS 1) with N (an integer) taps and associated coefficients. The respective coefficients are adjusted to minimize the error between a received refer |
| 5521872 |
Apparatus and method for control of a first input first output type device |
May 28, 1996 |
| A first input-first output type circuit manages m n-bit words using m stages connected in series with first and second non-overlapping clock signals controlling even-numbered and odd numbered ones of the m stages, respectively. A process for controlling the circuit involves a first write |
| 5515309 |
1-bit adder and multiplier containing a 1-bit adder |
May 7, 1996 |
| A one-bit adder includes a carry stage and an adding stage and is constructed in a fast CMOS complementary pass transistor logic with complementary analog CMOS switches in the adding stage which consist of a PMOS and an NMOS transistor. The source of the PMOS transistor is connected |
| 5504531 |
Method and apparatus for field rate up-conversion |
April 2, 1996 |
| For improving motion portrayal and reducing undesirable artifacts, e.g., double images and "mouse teeth" structure, each pixel of intermediate fields in a field rate up-conversion system is determined from nearby pixels in the existing fields using an adaptive linear filtering method |
| 5502764 |
Method, identification device and verification device for identificaiton and/or performing digit |
March 26, 1996 |
| The present invention relates to a method, identification device and verification device for identification and/or performing digital signature which allows zero-knowledge access control. For many applications, e.g. smart cards for Pay-TV purposes, credit cards, passports, dongels or oth |
| 5491521 |
Scan velocity modulation system with auxiliary vertical deflection towards bright side of video |
February 13, 1996 |
| A video signal is applied to a kinescope having scan velocity modulation for improving picture sharpness in the vertical direction. Pictures from video signals of a type having non-interpolated and vertically interpolated lines (e.g., interlace-progressive up-converted) will tend to |
| 5490094 |
Method and apparatus for noise reduction |
February 6, 1996 |
| A noisy input signal x is filtered with a restoration filter of median type to generate a filtered input signal y. The sum of the absolute differences between filtered and unfiltered signal is calculated for each position of a sliding window within the input signal representing a local e |
| 5479511 |
Method, sender apparatus and receiver apparatus for modulo operation |
December 26, 1995 |
| An access control system involves a first cryptographic device communicating with a second cryptographic device using a modulo-based protocol. To transmit a message from the first device to the second device, a random number is combined with the number representing the message withou |
| 5461675 |
Apparatus and method for access control |
October 24, 1995 |
| In a system for controlling access to signals such as pay-TV signals, the signals include data packets that are received and by a decoder and forwarded to a smart card for access authorization processing. The data packets contain information that updates entitlement or access authori |
| 5452357 |
Method and apparatus for access control and/or identification |
September 19, 1995 |
| A system providing access control, including encryption and decryption capability, replaces a public key directory by a transmission between an authority, or a sender S, and a receiver R of a "seed" value. The seed is processed to provide both identity information for R and public keys, |
| 5444455 |
Helical antenna feed element with switches to select end fire and backfire modes and circular po |
August 22, 1995 |
| An antenna system capable of receiving electromagnetic radiation having either right or left helical polarization, and either vertical or horizontal linear polarization includes an energy concentrator which concentrates energy at a focal point. A helical antenna is arranged in the pr |
| 5434917 |
Unforgeable identification device, identification device reader and method of identification |
July 18, 1995 |
| Memory cards are cheap and contain memory means, but can be forged and duplicated easily. Smart-cards contain also a microprocessor and can be used for cryptographic purposes, but are much more expensive. The plastic support of the card contains randomly distributed ferrite particles (eg |
| 5426394 |
Sound intermediate frequency amplifier for a broadcast receiver |
June 20, 1995 |
| In a broadcast receiver, a dc voltage operating source is coupled to an operating voltage terminal of a sound IF integrated circuit via a collector/emitter path of a transistor, and a second source of operating voltage is connected via an RC integrating network to the base of the tra |
| 5421848 |
Method for fabricating a lens having a variable refractive index |
June 6, 1995 |
| The invention presents a method for the fabrication or production of three-dimensional lenses with a variable refractive index by wrapping a material with a given refractive index. It is preferred, that this material has the shape of a thread, which might be cylindrical. The preferre |
| 5398006 |
Method and apparatus for automatic loop control |
March 14, 1995 |
| A method of automatically controlling a loop comprising the steps of applying an input signal and an error correction signal to a signal correction circuit to provide a digital corrected signal. Applying the digital corrected signal and a reference signal to an error measurement circ |
| 5396157 |
Method and apparatus for improving vertical sharpness of picture tubes |
March 7, 1995 |
| Large format TV tubes must produce a high peak brightness in order to be acceptable to the user. This results in a large beam current in bright areas of the picture and in a subsequent defocusing of the resulting spot on the display and in a loss of the sharpness of vertical and horizont |
| 5387946 |
Method and apparatus for measuring noise in video signals |
February 7, 1995 |
| A method of measuring noise in a television signal includes the steps of storing an estimated noise value N. The activity values A of blocks of pixels are measured and periodically compared with the estimated noise value N. A first correction value C.sub.v1 is added to the estimated valu |
| 5386237 |
Method and apparatus for adaptive progressive scan conversion |
January 31, 1995 |
| Extra lines (Yout) for display be progressive scanning are obtained by adaptive interpolation from the original (interlaced) lines. The original lines are left untouched. Each interpolated pixel is the result of a soft switch (456,461,462) between pure interframe interpolation (452), whi |
| 5375006 |
Twisted nematic liquid crystal display devices with optical axis of birefringent layer inclined |
December 20, 1994 |
| The disclosure relates to electrically controlled display devices that use the polarization rotation properties of twisted nematic liquid crystal layers. A display device comprises an optical cavity formed by two polarizers enclosing a layer of twisted nematic liquid crystal with which |
| 5373557 |
System for processing user access control data at a decoder |
December 13, 1994 |
| A subscriber/user TV system operates in response to locally stored entitlements. A user gains access to a program only if the description of the program is consistent with entitled rights owned by the user. Each night at a given hour, decoders affiliated with the system tune to a pre |
| 5353187 |
Safety circuits for a television receiver |
October 4, 1994 |
| A first transformer is coupled to a deflection yoke and coupled to a derived secondary voltage source for driving a load, for example, for generating an ultor voltage. An on/off switch is responsive to an on/off signal. A second transformer has a primary winding coupled to the switch |
| 5331347 |
Television sync and phase detector disable circuit |
July 19, 1994 |
| A television receiver is subject to certain operational conditions which result in poor, unreliable or unusable separated sync pulse signals. During such conditions the use of unsuitable sync signals for synchronization and the like is inhibited to prevent mis-triggering or spurious |
| 5327172 |
Polling for detection of power supply or other failures of a digital circuit |
July 5, 1994 |
| A television receiver includes a standby power supply, and an operational or run mode power supply. A microprocessor coupled to the standby power supply controls switching between a run mode, where the standby and run mode power supplies are operative, and a standby mode where only the |
| 5317401 |
Apparatus for providing contrast and/or brightness control of a video signal |
May 31, 1994 |
| The present invention is a video drive apparatus of the two ramp type which includes facility to selectively adjust the brightness and/or the contrast of an image reproduced on a display device. In this apparatus, at least one of the ramp signals is generated digitally by for example a c |
| 5303048 |
Circuit for synchronizing an on-screen display (OSD) on a picture screen |
April 12, 1994 |
| In a television receiver, a source of super sandcastle pulse is connected via a horizontal sync signal extracting first circuit and the vertical sync signal extracting second circuit to the horizontal and vertical sync input terminals of an OSD processor. Advantageously, it has been foun |
| 5285452 |
Microcomputer power failure control circuit |
February 8, 1994 |
| A VCR or other microcomputer controlled equipment may be subjected to AC supply interruption resulting from many causes, such as, plugging or unplugging the AC supply with the unit switched on, contact bounce on the AC power switch, AC supply drop outs caused by heavy load switching, |
