| 5894518 |
Picture information transmission system and picture coding and decoding apparatus for use with it |
| Apr-13-1999 |
A picture information transmission system enciphers and transmits picture information after interframe coding so that a receiving apparatus which does not have a cipher decoding device can decode and display... |
| 5887061 |
Compression coding device with scrambling function and expansion reproducing device with descrambling function |
| Mar-23-1999 |
In a compression coding device having a scrambling function, a variable length coder outputs coded image data. When the image data are to be written to a memory included in a multiplexer, a controller... |
| 5852663 |
Information signal transmission system |
| Dec-22-1998 |
The information signal transmission system of the present invention is so designed as to convert the analog information signal into digital information data and to transmit these digital data after enciphering... |
| 5848154 |
Apparatus for managing software using quantity |
| Dec-8-1998 |
A DES decrypting unit decrypts video data frames encrypted and compressed based on MPEG standards, when receiving them. The decrypted video data frames are expanded one by one in a MPEG expansion circuit.... |
| 5838791 |
Encoder and decoder |
| Nov-17-1998 |
The present invention was made in order to provide a technology capable of safely ciphering compressed and encoded image data irrespective of lines or media and carrying out a correct decoding operation... |
| 5835591 |
Demultiplexing device |
| Nov-10-1998 |
The object of the invention is a demultiplexing device. This device is characterized in that it comprises means for storing data of a multiplexed data stream (4), programmable means for storing data filters... |
| 5828754 |
Method of inhibiting copying of digital data |
| Oct-27-1998 |
A method of inhibiting copying of digital data. In a first embodiment, a sequence of symbols is added to original data, the sequence of symbols selected to encode into channel bits having a large accumulated... |
| 5809139 |
Watermarking method and apparatus for compressed digital video |
| Sep-15-1998 |
A digital watermarking method and apparatus allows for the watermarking of a digital video signal in a compressed form, thereby allowing watermarking of a pre-compressed video sequence without requiring... |
| 5805700 |
Policy based selective encryption of compressed video data |
| Sep-8-1998 |
Basic transfer units (BTUs) of compressed video data of video images are selectively encrypted in accordance with an encryption policy to degrade the video images to at least a virtually useless state,... |
| 5784491 |
Method and apparatus for coding and decoding image data using vector quantization |
| Jul-21-1998 |
An image is vector-quantized into coded data, which is stored in a storage device. The coded data is read out of the storage device and is decoded. The decoded data may cause an overflow due to a vector... |
| 5768375 |
CATV system |
| Jun-16-1998 |
An image-data-system host computer outputs image data, the protocol of which is not disclosed. The image data outputted from the image-data-system host computer is transmitted via an image-data-system... |
| 5742680 |
Set top box for receiving and decryption and descrambling a plurality of satellite television signals |
| Apr-21-1998 |
A system and corresponding method are provided for selecting one of a plurality of simultaneously received encrypted direct broadcast satellite (DBS) signals for decryption and viewing. A converter box... |
| 5721778 |
Digital signal transmitting method, digital signal receiving apparatus, and recording medium |
| Feb-24-1998 |
A digital signal transmitting method, a digital signal receiving apparatus, and a recording medium which ensure the security of fee-charged software information. When an image providing predetermined services... |
| 5715315 |
CATV systems |
| Feb-3-1998 |
A CATV system including a CATV network, multiplicity of subscriber units, apparatus for transmitting over said CATV network encrypted information individually addressed to a subscriber unit and apparatus... |
| 5706346 |
Scrambling apparatus and descrambling apparatus |
| Jan-6-1998 |
A scrambling apparatus has at least one of the following processing units: a signal inserting processor for inserting a dummy pattern indicating the quantization width in the compressed video data; a conversion... |
| 5699434 |
Method of inhibiting copying of digital data |
| Dec-16-1997 |
A method of inhibiting copying of digital data. In a first embodiment, a sequence of symbols is added to original data, the sequence of symbols selected to encode into channel bits having a large accumulated... |
| 5689569 |
Method and device for the utilization of electrical signals |
| Nov-18-1997 |
An interface is made for a device for the exploitation of electrical signals between a receiver of this device and a device for the exploitation of these signals. The interface is capable of sending, alternatively,... |
| 5689442 |
Event surveillance system |
| Nov-18-1997 |
A surveillance system operable to capture images and sounds concerning events for storage in a random access data store. A data management functionality is provided to dynamically manage storage of information... |
| 5682425 |
Information signal transmission system |
| Oct-28-1997 |
The information signal transmission system of the present invention is so designed as to convert the analog information signal into digital information data and to transmit these digital data after enciphering... |
| 5680454 |
Method and system for anti-piracy using frame rate dithering |
| Oct-21-1997 |
A method and system of displaying an image sequence containing a plurality of image frames to inhibit an unauthorized duplication thereof by a camera. The method includes steps of generating a pseudo-random... |
| 5675654 |
System and method for interfacing a transport decoder to a national renewable security systems (NRSS) smart card |
| Oct-7-1997 |
A transport decoder 110, for receiving and processing a transport data stream using MPEG-2 formats, includes connections to a physical layer channel interface (channel interface) 112, a buffer memory 114,... |
| 5673357 |
Video recording, transmitting and reproducing apparatus with concurrent recording and transmitting or multiple dubbing of copy protected video signals |
| Sep-30-1997 |
A recording and reproducing apparatus records and reproduces video signals which include video information and copy protection information for restricting the number of times the video information may... |
| 5646997 |
Method and apparatus for embedding authentication information within digital data |
| Jul-8-1997 |
Arbitrary digital information is embedded within a stream of digital data, in a way that avoids detection by a casual observer and that allows a user to determine whether the digital data have been modified... |
| 5646994 |
Method and apparatus for recording sensor data |
| Jul-8-1997 |
A method and apparatus for recording sensor data. The analog and digital signals containing the sensor data are accompanied by a concurrent analog video signal. The analog signals are converted to digital... |
| 5636279 |
Scramble apparatus and descramble apparatus |
| Jun-3-1997 |
A scramble apparatus for scrambling data including a variable length code and a descramble apparatus is for descrambling a scrambled signal, and a scramble transmission apparatus comprising the scramble... |
| 5631693 |
Method and apparatus for providing on demand services in a subscriber system |
| May-20-1997 |
An on demand services feature for the provision of video, audio, and data services for a subscription system of the CTV type, or the like. The system comprises a headend coupled to a distribution network... |
| 5621799 |
Scrambled transmission system |
| Apr-15-1997 |
A scrambled transmission system for transmitting a digital data containing variable length coding conforming to a MPEG standard includes a scramble key generator for generating a scramble key at a timing... |
| 5621794 |
Moving-picture encipherment method and system, and enciphered moving-picture decipherment method and system |
| Apr-15-1997 |
Moving-picture data in a frame is encoded without depending on another frame of moving-picture data, and moving-picture data in a frame is encoded depending on another frame of moving-picture data. Whether... |
| 5606612 |
Method and apparatus for television signal scrambling using a line expansion technique |
| Feb-25-1997 |
A method and apparatus for scrambling an original analog video signal samples predetermined portions of the original video signal at a first rate and stores the sampled portions of the original video signal... |
| 5600721 |
Apparatus for scrambling a digital video signal |
| Feb-4-1997 |
Apparatus for intermittently or partially scrambling a digital video signal which encodes a digital video signal and successively supplies frames of video data corresponding to the encoded digital video... |
| 5594492 |
Method and apparatus for rapid channel selection |
| Jan-14-1997 |
In a video distribution system, methods and apparatus for rapid channel selection are implemented to reduce the channel-to-channel latencies which might otherwise occur in modern video decoding systems,... |
| 5590202 |
Countdown system for conditional access module |
| Dec-31-1996 |
A digital conditional access module for a subscriber terminal comprises a decryption device including at least one PID register and an associated countdown register. The decryption device is enabled for... |
| 5583938 |
Image signal scrambling apparatus and descrambling apparatus |
| Dec-10-1996 |
An object of the invention is to provide an image scrambling apparatus and an image descrambling apparatus capable of making a communication of secrecy by scrambling a digital image signal as well as variable-length-encoding... |
| 5557677 |
Method and arrangement for communication of information |
| Sep-17-1996 |
In a transmitter, information for transmission is received in the form of a digital signal, electrical or optical, which is converted into short signal fragments, each of which is assigned an index. A... |
| 5553140 |
Digital and analog interface for set back box |
| Sep-3-1996 |
A method and apparatus for interfacing digital and analog consumer electronic devices with digital and analog broadcast signals. The broadcast signals are received by electronic devices which tune the... |
| 5546461 |
Scramble system for use in digital video signal recording and reproducing system or transmission and receiving system, comprising scramble apparatus and descramble apparatus |
| Aug-13-1996 |
A scramble system of the present invention including a scramble apparatus and a descramble apparatus is applied to a recording and reproducing system or a transmission and receiving system wherein a frame... |
| 5535275 |
Apparatus and method for producing scrambled digital video signals |
| Jul-9-1996 |
Unauthorized copying of a video signal is prevented by means of a compression encoding circuit that selectively applies scrambling to the encoded signal. The compression encoding circuit is of the type... |
| 5521978 |
Digital signal processing apparatus |
| May-28-1996 |
Digital signal processing apparatus in which compressed frequency components of a digital signal are processed to selectively achieve fade-in, fade-out and scene change effects and where the digital signal... |
| 5515437 |
Scramble transmission apparatus and signal processing apparatus |
| May-7-1996 |
The occurrence of malfunction on the reproduction side is avoided by preventing a scrambled signal from being coincided with a reserved word in the signal when a scramble process is carried out in order... |
| 5504816 |
Method and apparatus for controlling access to digital signals |
| Apr-2-1996 |
A method and apparatus are provided for controlling access to digital signals sent via a first communication path and retransmitted over a second communication path. The digital signals, having been encrypted... |
| 5497419 |
Method and apparatus for recording sensor data |
| Mar-5-1996 |
A method and apparatus for recording sensor data. The analog and digital signals containing the sensor data are accompanied by a concurrent analog video signal. The analog signals are converted to digital... |
| 5461674 |
Method and apparatus for controlling playback of recorded HDTV signals |
| Oct-24-1995 |
An HDTV receiver for restricting playback of HDTV signals encrypted with a level 1 encryption. The receiver includes an output port and an input port between which an external, controllable level 1 decryption... |
| 5426699 |
Method and apparatus for digitizing a scrambled analog video signal |
| Jun-20-1995 |
An on demand services feature for the provision of video, audio, and data services for a subscription system of the CTV type, or the like. The system comprises a headend coupled to a distribution network... |
| 5425050 |
Television transmission system using spread spectrum and orthogonal frequency-division multiplex |
| Jun-13-1995 |
An apparatus for encoding a television production signal for transmission, the television production signal including a first input signal carrying a first class of data and a second input signal carrying... |
| 5412720 |
Interactive home information system |
| May-2-1995 |
An interactive cable television system having a plurality of feeder servers, a plurality of home interface controllers and a feeder port. Home interface controllers are each equipped with a radio frequency... |
| 5384849 |
Apparatus and method for encoding/decoding data including the suppression of blocking artifacts |
| Jan-24-1995 |
A method and apparatus for removing blocking artifacts in an encoder/decoder system. The encoder includes a delay device for delaying original input frame data, a decoder for decoding the compressed data... |
| 5377266 |
Scramble apparatus and descramble apparatus |
| Dec-27-1994 |
A scramble apparatus is for scrambling data including a variable length code and a descramble apparatus for descrambling a scrambled signal, and a scramble transmission apparatus comprising the scramble... |
| 5285497 |
Methods and apparatus for scrambling and unscrambling compressed data streams |
| Feb-8-1994 |
Methods and apparatus for encoding compressed data streams efficiently, and methods and apparatus for decoding the encrypted data streams efficiently and inexpensively, are disclosed. In an encoder 10',... |
| 5271043 |
Device and method for the data transmission or storage optimizing the use of the pass-band |
| Dec-14-1993 |
A device and a method for the transmission or storage of data optimizing the use of the pass-band. Also, a method for transmission by phase modulation. In order to obtain high data throughput rates, the... |
| 5268961 |
Error control apparatus for a digital video signal processing system |
| Dec-7-1993 |
In a system for coding and decoding a digital television signal, a signal representing residual image information is transformed into plural subband signals representing vertical and horizontal frequencies,... |
