Telediffusion de France
104Patents
3Active
104Granted
43Portfolio score
Filing activity: Mar 14, 1977 → Aug 26, 2011 · 2 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5446747A | Error-correction coding method with at least two systematic convolutional codings in parallel, corresponding iterative decoding method, decoding module and decoder | Electricity | 237 | Expired |
| US5235415A | Device for the intelligible consultation of data relating to the fees programs of a subscription television and/or radio service | Electricity | 231 | Expired |
| US5197061A | Device for the transmission of digital data with at least two levels of protection and corresponding reception device | Electricity | 208 | Expired |
| US5228025A | Method for the broadcasting of digital data, notably for radio broadcasting at a high bit-rate towards mobile receivers, with time-frequency interlacing and assistance in the acquisition of automatic frequency control, and corresponding receiver | Electricity | 187 | Expired |
| US4881241A | Method and installation for digital communication, particularly between and toward moving vehicles | Electricity | 171 | Expired |
| US5452288A | Method for the transmission of digital data in radio paging systems and corresponding radio paging receiver | Electricity | 164 | Expired |
| US6307939A | Method and equipment for allocating to a television program, which is already conditionally accessed, a complementary conditional access | Electricity | 143 | Expired |
| US5196933A | Encoding and transmission method with at least two levels of quality of digital pictures belonging to a sequence of pictures, and corresponding devices | Electricity | 131 | Expired |
| US4980764A | Method for the encoding of data for assistance in the reconstruction of a sub-sampled moving electronic image | Electricity | 125 | Expired |
| US4308558A | Page selection device for videotext system | Electricity | 116 | Expired |
| US5315584A | System of data transmission by sharing in the time-frequency space with channel organization | Electricity | 102 | Expired |
| US5130793A | Reconfigurable multiple-point wired in-house network for simultaneous and/or alternative distribution of several types of signals, notably baseband images, and method for the configuration of a system such as this | Electricity | 101 | Expired |
| US5696902A | System for management of the usage of data consultations in a telecommunication network | Electricity | 69 | Expired |
| US6151578A | System for broadcast of data in an audio signal by substitution of imperceptible audio band with data | Electricity | 67 | Expired |
| US5742681A | Process for the broadcasting of programmes with progressive conditional access and separation of the information flow and the corresponding receiver | Electricity | 67 | Expired |
| US5615265A | Process for the transmission and reception of conditional access programs controlled by the same operator | Electricity | 62 | Expired |
| US5610944A | Process and device for segmentation into sub-bands and for reconstruction of a digital signal, and corresponding device | Electricity | 62 | Expired |
| US4361853A | System for reducing the visibility of the noise in television pictures | Electricity | 60 | Expired |
| US7146615B1 | System for fast development of interactive applications | Electricity | 56 | Expired |
| US5208857A | Method and device for scrambling-unscrambling digital image data | Electricity | 50 | Expired |
| US4580158A | Video signal combining system | Electricity | 47 | Expired |
| US6810006B2 | OFDM signal organized so as to simplify reception | Electricity | 42 | Expired |
| US6823010B1 | Method for switching a first digital audio-visual program video component(s) on a second digital audio-visual program video component(s) | Electricity | 42 | Expired |
| US4989087A | Multi-predictive method to estimate the motion of the points of an electronic picture | Physics | 35 | Expired |
| US5031038A | Process and device for the compression of image data by mathematical transformation effected at low cost, particularly for the transmission at a reduced rate of sequences of images | Physics | 33 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.