| Patents for H04N 21 - Selective content distribution, e.g. interactive television, vod [video on demand] (56,445) |
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| 05/27/1993 | CA2123778A1 Headend processing for a digital transmission system |
| 05/26/1993 | EP0543668A1 Apparatus for receiving scrambled signals and recording method |
| 05/25/1993 | US5214622 Information display apparatus |
| 05/19/1993 | EP0500680A4 Cable television decoder to television accessory interfacing |
| 05/12/1993 | EP0533671A4 Video telephone employing pulse width modulation for data transmission |
| 05/05/1993 | EP0539922A2 Digital video tape recorder |
| 05/05/1993 | EP0516828A4 Method for providing video programming nearly on demand |
| 04/28/1993 | EP0532503A4 Cable television radio frequency subscriber data transmission apparatus and calibration method |
| 04/15/1993 | WO1993007713A1 Apparatus and method for electronic device for information services |
| 04/14/1993 | EP0536628A1 Selection of compressed television signals from single channel allocation based on viewer characteristics |
| 04/06/1993 | US5200825 Commercial insertion system remotely controlling multiple video switches |
| 04/01/1993 | WO1993006692A1 Pstn architecture for video-on-demand services |
| 04/01/1993 | CA2120031A1 Pstn architecture for video-on-demand services |
| 03/31/1993 | EP0533671A1 Video telephone employing pulse width modulation for data transmission |
| 03/24/1993 | EP0532503A1 Cable television radio frequency subscriber data transmission apparatus and calibration method. |
| 03/18/1993 | WO1993004572A2 Coding of images and originals, for example for telefax and colour television |
| 03/17/1993 | EP0531302A1 Cable television radio frequency subscriber data transmission apparatus and rf return method |
| 03/16/1993 | US5195135 Automatic multivariate censorship of audio-video programming by user-selectable obscuration |
| 03/04/1993 | DE4228753A1 Multiple channel TV transmission method - including receiver with channel selector for multiplexed video information and control data as well as signal separator with decoder |
| 03/02/1993 | US5191615 Interrelational audio kinetic entertainment system |
| 02/24/1993 | EP0528022A1 Television signal transmission system with carrier offset compensation |
| 01/26/1993 | US5182642 Apparatus and method for the compression and transmission of multiformat data |
| 01/20/1993 | EP0523626A1 Multipoint teleconference system employing communication channels set in ring configuration |
| 01/20/1993 | CA2073387A1 Television viewer monitoring system |
| 01/19/1993 | US5181112 Television signal transmission system with carrier offset compensation |
| 01/14/1993 | DE4123137A1 Transmission system for HDTV complex digital signals - has transmitter and receiver for additional synchronising signal respectively associated with multiplexer and demultiplexer |
| 01/13/1993 | EP0522853A2 Digital data reproducing apparatus and method |
| 01/07/1993 | EP0521529A2 An image encoding and transmitting system |
| 01/07/1993 | EP0521487A1 Information recording medium and reproducing device therefor |
| 12/29/1992 | US5175617 Telephone line picture transmission |
| 12/16/1992 | EP0517719A1 Method for coding video signals |
| 12/15/1992 | US5172413 Television signal distribution network |
| 12/09/1992 | EP0517273A2 Method and device to regulate the output bit rate in variable bit rate video coders |
| 12/09/1992 | EP0516828A1 Method for providing video programming nearly on demand. |
| 12/09/1992 | EP0516741A1 Hybrid analog/digital signal processing |
| 12/09/1992 | CN1066950A Independent external security module for digitally upgradeable television signal decoder |
| 12/01/1992 | US5168372 For monitoring and controlling the viewing time |
| 11/26/1992 | WO1992021206A1 Addressable video feed system |
| 11/19/1992 | EP0513763A2 Television signal and ATM cell switching system |
| 11/18/1992 | CN1066360A Automatic frequency selection in bi-directional cable televison system |
| 10/29/1992 | WO1992016072A3 Television signal transmission system with carrier offset compensation |
| 10/28/1992 | EP0510095A1 Interrelational audio kinetic entertainment system |
| 10/28/1992 | EP0464025A4 Tv data capture device |
| 10/27/1992 | US5159449 Method and apparatus for data reduction in a video image data reduction system |
| 10/14/1992 | EP0507884A1 Transmitting encoded data on unreliable networks |
| 10/13/1992 | US5155591 Method and apparatus for providing demographically targeted television commercials |
| 10/13/1992 | US5155590 System for data channel level control |
| 10/07/1992 | EP0506877A1 Media pipeline system |
| 09/30/1992 | EP0506435A2 Independent external security module for a digitally upgradeable television signal decoder |
| 09/29/1992 | US5151789 System and method for automatic, unattended recording of cable television programs |
| 09/23/1992 | EP0505006A2 Local communication bus system and apparatus for use in such a system |
| 09/23/1992 | EP0504991A2 Cable subscriber control device using shared jamming modules |
| 09/20/1992 | WO1992017010A1 Automatic frequency selection in a bi-directional cable television system |
| 09/20/1992 | CA2106599A1 Automatic frequency selection in a bi-directional cable television system |
| 09/16/1992 | EP0503956A2 Decompression of video signal |
| 09/16/1992 | CA2062200A1 Decompression processor for video applications |
| 09/12/1992 | WO1992016072A2 Television signal transmission system with carrier offset compensation |
| 09/12/1992 | CA2082654A1 Television signal transmission system with carrier offset compensation |
| 09/02/1992 | EP0500680A1 Cable television decoder to television accessory interfacing |
| 09/01/1992 | US5144664 Apparatus and method for upgrading terminals to maintain a secure communication network |
| 08/19/1992 | EP0499065A2 Optical transmission system for the subscriber connection area with optical amplifiers |
| 08/18/1992 | US5140633 Cable subscriber control device using shared jamming modules |
| 08/11/1992 | US5138440 Method and apparatus for communicating a plurality of asynchronous signals over a digital communication path |
| 07/29/1992 | EP0496663A2 Multimedia communication apparatus |
| 07/28/1992 | US5134484 Superimposing method and apparatus useful for subliminal messages |
| 07/23/1992 | WO1992012599A1 Audio and video transmission and receiving system |
| 07/21/1992 | US5132992 Audio and video transmission and receiving system |
| 07/14/1992 | US5130993 Transmitting encoded data on unreliable networks |
| 07/09/1992 | WO1992011713A1 Method for providing video programming nearly on demand |
| 07/07/1992 | US5128765 System for implementing the synchronized superimposition of subliminal signals |
| 07/02/1992 | DE4041632A1 Preparing several TV signals for transmission - involves frequency conversion and multiplexing with additional digital filter preceding channel bandpass filter with same clock rate |
| 07/01/1992 | EP0493129A2 Image processing method and apparatus |
| 06/09/1992 | US5121205 Apparatus for synchronizing main and auxiliary video signals |
| 05/27/1992 | EP0487306A2 In-service cable television measurements |
| 05/27/1992 | EP0486874A2 Multiplex digital communication system for transmitting channel identification information |
| 05/20/1992 | EP0485887A2 Apparatus and method for upgrading terminals to maintain a secure communication network |
| 05/14/1992 | WO1992008305A1 Multichannel data compressor |
| 05/13/1992 | EP0484423A1 Digital signal processing system. |
| 03/31/1992 | US5101267 Wide area real-time T-V audience polling system with local area stations linked by satellite |
| 03/18/1992 | EP0569350A4 Television programme distribution system. |
| 03/11/1992 | WO1992004801A1 User interface for television schedule system |
| 03/05/1992 | WO1992003888A1 Subliminal device |
| 03/05/1992 | WO1992003816A1 A display control device incorporating an auxiliary display |
| 03/05/1992 | DE4025621A1 Secure video digital signal value ATM network transmission - grouping into data matrices with constant line numbers and variable number of packets |
| 03/03/1992 | US5093718 Interactive home information system |
| 02/19/1992 | CN1058876A Cable television radio frequency subscriber data transmission apparatus and rf return method |
| 02/06/1992 | WO1991013516A3 Method for coding video signals |
| 01/08/1992 | EP0465110A2 Apparatus for record and playback of a digital signal |
| 01/08/1992 | EP0464025A1 Tv data capture device. |
| 12/31/1991 | US5077607 Cable television transaction terminal |
| 12/17/1991 | US5073822 In-service cable television measurements |
| 12/04/1991 | CN1056787A Cable television radio frequency subscriber data transmission apparatus and calibration method |
| 11/27/1991 | EP0458344A2 Television receiver |
| 10/01/1991 | US5053883 Terminal polling method |
| 09/24/1991 | US5052037 Video telephone employing pulse width modulation for data transmission |
| 09/21/1991 | WO1991015065A1 Cable television radio frequency subscriber data transmission apparatus and rf return method |
| 09/21/1991 | WO1991015063A1 Cable television radio frequency subscriber data transmission apparatus and calibration method |
| 09/21/1991 | CA2078563A1 Cable television radio frequency subscriber data transmission apparatus and rf return method |
| 09/21/1991 | CA2078548A1 Cable television radio frequency subscriber data transmission apparatus and calibration method |
| 09/18/1991 | EP0446613A2 Method of processing several television signals for transmission and device |