| 6425082 |
Watermark applied to one-dimensional data |
| Jul-23-2002 |
In the process of embedding watermark information in one-dimensional source data, first spread one-dimensional data x(t) is generated by subjecting one-dimensional source data s(t) to spectrum-spreading... |
| 6597789 |
Video/audio scrambling with single conversion tuners |
| Jul-22-2003 |
Conventional decoding systems for scrambled audio-visual signals are improved by providing a dual-side local oscillator that functions as a high-side oscillator if the incoming RF signal is unscrambled... |
| 4605961 |
Video transmission system using time-warp scrambling |
| Aug-12-1986 |
A subscriber cable television system using predominantly digital signal processing techniques employs an improved time-warp and segment scrambling method for providing extremely high security. Means are... |
| 4742543 |
Video transmission system |
| May-3-1988 |
A subscriber cable television system uses predominantly digital signal processing techniques and has extremely high security and an increased capacity for transmitting program and customer data to individual... |
| 6937728 |
Verifiable anonymous channel |
| Aug-30-2005 |
Two El Gamal ciphertexts, which are input to a two-input two-output unit switching gates SW forming a permutation network, are randomized with a random number and randomly permuted, and a zero-knowledge... |
| 4636854 |
Transmission system |
| Jan-13-1987 |
In a television receiver for a transmission system in which the video signal is scrambled to allow only for its authorized reception, a video signal processor (8) is provided in which the scrambled video... |
| 4651205 |
Television transmission system |
| Mar-17-1987 |
In a television receiver for a transmission system in which the video signal is scrambled to allow only for its authorized reception, a video signal processor (8) is provided in which the scrambled video... |
| 4742544 |
Television transmission network with scrambling and descrambling |
| May-3-1988 |
A controlled access television communications network in which scrambling and descrambling are accomplished by digital signal processing. At the scrambler, the video and audio information are digitized,... |
| 4354201 |
Television system with access control |
| Oct-12-1982 |
A television system with access control comprises a transmitter and receis. The transmitter comprises a video signal and sound signal formation circuit, means for transmitting these signals and a jamming... |
| 5530756 |
Television scrambling and descrambling method, and transmitter and receiver using said method |
| Jun-25-1996 |
In a television transmission system comprising an analog video channel scrambled with a control word which is changed occasionally and a NICAM sound channel scrambled with a control word which is also... |
| 5091936 |
System for communicating television signals or a plurality of digital audio signals in a standard television line allocation |
| Feb-25-1992 |
A system is provided for selectively transmitting horizontal television lines including video and digital audio components or equivalent digital data lines containing a plurality of audio program signals.... |
| 4215366 |
Subscriber-limited reception television broadcast security encoder-decoder system |
| Jul-29-1980 |
A method and apparatus for encoding and decoding of standard television signals are provided for enabling reception thereof in an intelligible manner only by authorized subscribers. The scrambling of the... |
| 6904591 |
Software development system for editable executables |
| Jun-7-2005 |
The invention provides a Software Development Program having a compiled programming language, Compiler for that language, and a built-in text Editor. The programming language has a block structure and... |
| 6185687 |
Signal reproducing/recording/transmitting method and apparatus and signal record medium |
| Feb-6-2001 |
A signal reproducing apparatus for prohibiting copying or unauthorized use. The apparatus includes a copying management information decision circuit 19 for discriminating the state of the copying management... |
| 4964162 |
Secure television signal encoding and decoding system |
| Oct-16-1990 |
A television signal encoding and decoding system providing a line-spin scrambled video signal with substantially reduced amplitude gaps and line tilt and a digitally-encrypted audio signal that can be... |
| 4683586 |
Scrambling system for an audio frequency signal |
| Jul-28-1987 |
A scrambling system for an audio frequency signal is disclosed which employs a timebase-compressing and/or expanding system to measure the compressed and/or expanded amount of a segment time length caused... |
| 6222924 |
Scrambling of digital media objects in connection with transmission and storage |
| Apr-24-2001 |
To prevent unauthorized reception, storage, copying and reproduction of digital media objects it is defined in addition to a scrambled broadcast format a scrambled storage format which is different from... |
| 5392352 |
Scramble detecting circuit in a satellite broadcasting receiver and scramble detecting method |
| Feb-21-1995 |
In a satellite broadcasting receiver for receiving and decoding pulse code modulation (PCM) audio frame data having a plurality of channels, the logical state of charged flags (FD) included in the data... |
| 5455860 |
Scramble codec |
| Oct-3-1995 |
A scramble codec comprises a nonvolatile key data memory which holds a key data varying from one video recorder to another, a pair of line memories in which input picture signals are alternately written... |
| 4531024 |
Multilocation video conference terminal including video switching contention control |
| Jul-23-1985 |
In a multilocation video conference system, contention for the video to be transmitted to the locations is resolved by employing so-called talker and graphics contention resolution processes. Both the... |
| 6330334 |
Method and system for information dissemination using television signals |
| Dec-11-2001 |
A system and method of information dissemination that permits the user to listen to the specific content of information when and where he or she wants to. A radio or television receiver system receives... |
| 5524051 |
Method and system for audio information dissemination using various modes of transmission |
| Jun-4-1996 |
A system and method of information dissemination that permits the user to listen to the specific content of information when and where he or she wants to. A radio or television receiver system receives... |
| 6633982 |
Method and process for managing ultra secure electronic distribution of digital movies to commercial exhibitors |
| Oct-14-2003 |
A method and system for managing electronic distribution of digital movies to commercial exhibitors at warp speed is made ultra secure by utilizing synchronized and concurrent digitally bifurcated data... |
| 4646147 |
Method and apparatus for scrambling and unscrambling television signals |
| Feb-24-1987 |
Even though television signals are transmitted as analog signals over cable from the transmitter to the receivers of customers of the cable system, programs for which charges to the customers are payable... |
| 5243650 |
Method and apparatus for encryption/decryption of digital multisound in television |
| Sep-7-1993 |
The present invention relates to methods and apparatus for encryption and decryption, respectively, of digital sound in television. The decryption takes place in two steps. The first step, encryption with... |
| 6061793 |
Method and apparatus for embedding data, including watermarks, in human perceptible sounds |
| May-9-2000 |
A technique for hiding of data, including watermarks, in human-perceptible sounds, that is, audio host data, is disclosed. In one embodiment a method comprises three steps. In the first step, data to be... |
| 6836844 |
Information signal copy managing method, information signal recording method, information signal output apparatus, and recording medium |
| Dec-28-2004 |
An information signal copy managing method for properly protecting the copyright of information signals and, at the same time, guaranteeing user advantages in copying information signals within a limited... |
| 5590195 |
Information dissemination using various transmission modes |
| Dec-31-1996 |
A system and method of information dissemination that permits the user to listen to the specific content of information when and where he or she wants to. A radio or television receiver system receives... |
| 5761303 |
Inclusion of audio signal within video signal, at band edges |
| Jun-2-1998 |
A system wherein audio samples are added to a video signal, but within the time-frame allocated to video information, thereby displacing video data. Two audio samples are preferably placed in each video... |
| 4739510 |
Direct broadcast satellite signal transmission system |
| Apr-19-1988 |
Audio and control signals are digitized and inserted in the horizontal blanking intervals of the distributed composite television signal. The control signals are in the form of a data stream which includes... |
| 5506903 |
Digital multiplex transmission system |
| Apr-9-1996 |
A digital multiplex transmission system wherein the rate of convolution codes can be changed over in accordance with an object of a user without changing the transmission rate. A frame for transmitting... |
| 5406627 |
Digital data cryptographic system |
| Apr-11-1995 |
An audiovisual subscription system includes means for aperiodically inverting the lines of a transmitted video signal on a frame-by-frame basis and for decrypting encrypted PCM audio information which... |
| 4752953 |
Digital audio scrambling system with pulse amplitude modulation |
| Jun-21-1988 |
In a system for scrambling an audio signal for transmission with a video signal having non-video information intervals, an analog audio signal is converted into a scrambled compressed digital audio signal;... |
| 4809274 |
Digital audio companding and error conditioning |
| Feb-28-1989 |
A system for companding digital audio signal samples processes the digital audio signal samples to correct errors induced by the compression and expansion processes. These errors are calculated prior to... |
| 6978377 |
Copy protection using detailed copy control information |
| Dec-20-2005 |
Based on the detailed reproduction control information defining the reproduction control state of data to be transmitted, the CPU 12 of the data transmission apparatus creates a simplified reproduction... |
| 4424532 |
Coding and decoding system for video and audio signals |
| Jan-3-1984 |
A coding and decoding system for video and audio signals includes means at the transmitter for deriving clock and internal timing signals from the video signal. The internal timing signals are utilized... |
| 6286101 |
Central processing unit and microcomputer system having an internal operation unit for cryptographic |
| Sep-4-2001 |
A central processing unit capable of solving a problem of a conventional one in that when a user tries to implement a cryptographic function unique to the user using the conventional central processing... |
| 4688246 |
CATV scrambling system with compressed digital audio in synchronizing signal intervals |
| Aug-18-1987 |
A CATV television system has the sync and color subcarrier reference information replaced in the horizontal blanking intervals with compressed digital audio data. The digital audio data is in the form... |
| 4864614 |
Authorising coded signals |
| Sep-5-1989 |
In a transmission system authorization codes are transmitted to authorize subscribers to receive scrambled signals in an intelligible manner, such a system being a television transmission system. If each... |
| 5267312 |
Audio signal cryptographic system |
| Nov-30-1993 |
An audiovisual subscription system includes means for aperiodically inverting the lines of a transmitted video signal on a frame-by-frame basis and for decrypting encrypted PCM audio information which... |
| 5751806 |
Audio information dissemination using various transmission modes |
| May-12-1998 |
A system and method of information dissemination that permits the user to listen to the specific content of information when and where he or she wants to. A radio or television receiver system receives... |
| 4744080 |
Apparatus for receiving digital sound/data information |
| May-10-1988 |
A receiver for recovering sound/data information for a number of services transmitted digitally as a packet multiplex has the data, after demodulation, applied to a first unit (3) where it is resynchronized... |
| 4821097 |
Apparatus and method for providing digital audio on the sound carrier of a standard television signal |
| Apr-11-1989 |
A television transmission system replaces the standard FM audio portion of a television signal with digital audio. Three digital audio channels are time division multiplexed on the sound carrier, using... |
