| Patents for H04K 1 - Secret communication (16,771) |
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| 03/31/1987 | CA1219914A1 Privacy communication method and apparatus using time base compression and expansion |
| 03/25/1987 | CN85106644A Receiver for expanded frequency band signal |
| 03/24/1987 | US4652838 Phase randomization to reduce detectability of phase or frequency-modulated digital signals |
| 03/24/1987 | US4652699 Voice scrambler using frequency-inversion and band-splitting technique |
| 03/17/1987 | US4651205 Television transmission system |
| 03/17/1987 | US4651204 Jamming signal generating circuit |
| 03/12/1987 | EP0116082A4 Secure coding and decoding system and method for television program signals. |
| 03/10/1987 | CA1219059A1 Method of broadcasting an encoded video signal and a receiving apparatus for decoding the signal |
| 03/04/1987 | EP0212223A1 Video encoder apparatus |
| 02/24/1987 | US4646147 Method and apparatus for scrambling and unscrambling television signals |
| 02/19/1987 | DE2036112C1 Frequency-hopping radio communication system - uses control for coupling field connecting transmitter according to frequency required for speech direction of station |
| 02/17/1987 | CA1218143A1 Timing generator for sync suppressed television signals |
| 01/27/1987 | US4639777 Apparatus for scrambling and descrambling communication signals |
| 01/22/1987 | EP0131573A4 Ram air combustion steering system for a guided missile. |
| 01/21/1987 | EP0209079A2 Method for making an enciphered radio communication |
| 01/20/1987 | US4638357 Audio scrambler |
| 01/15/1987 | WO1987000377A1 Scrambling apparatus |
| 01/13/1987 | US4636855 Scrambled television signal receiver system |
| 01/13/1987 | US4636854 Transmission system |
| 01/13/1987 | CA1216633A1 Scrambling system for an audio frequency signal |
| 01/13/1987 | CA1216632A1 Scrambling system for audio frequency signals |
| 01/06/1987 | US4634808 Descrambler subscriber key production system utilizing key seeds stored in descrambler |
| 12/30/1986 | EP0206821A2 Data transmission system |
| 12/30/1986 | EP0206264A2 Expanded partial response processing for analog signal enciphering and the like |
| 12/10/1986 | EP0204226A2 Method for realising an encrypted radio communication |
| 12/09/1986 | US4628358 Television signal encryption system with protected audio |
| 12/02/1986 | CA1214865A1 Catv communications system |
| 11/18/1986 | US4623980 Method of processing electrical signals by means of Fourier transformations |
| 11/18/1986 | US4623918 Pay television system utilizing multi-frequency passive filters |
| 11/18/1986 | CA1214266A1 System for detecting a marker signal inserted in an information signal |
| 11/11/1986 | US4622680 Hybrid subband coder/decoder method and apparatus |
| 11/05/1986 | EP0200310A2 Direct broadcast satellite signal transmission system |
| 10/29/1986 | EP0199410A1 System for the secret transmission of audio signals, and television set for receiving such signals |
| 10/08/1986 | EP0196724A1 Scrambled television signals |
| 10/08/1986 | EP0111489B1 Encryption system key distribution method and apparatus |
| 10/08/1986 | EP0108151B1 Secret-speech device |
| 09/23/1986 | US4613902 Method of broadcasting an encoded video signal and a receiving apparatus for decoding the signal |
| 09/23/1986 | US4613901 Signal encryption and distribution system for controlling scrambling and selective remote descrambling of television signals |
| 09/23/1986 | US4613900 Digital code reading apparatus and method |
| 09/17/1986 | EP0194839A2 Communications network using IC cards |
| 09/17/1986 | EP0194721A2 Digital sound/data information receiver |
| 09/16/1986 | US4612627 Digital signal composing circuit for cross-fade signal processing |
| 09/16/1986 | US4612414 Secure voice transmission |
| 09/16/1986 | CA1211521A1 Cryptographic system |
| 09/10/1986 | EP0194186A1 Method for data transmission by insertion into an analogous speech signal, and device for carrying out this method |
| 09/02/1986 | CA1210817A1 Method and apparatus for distorting a speech signal |
| 08/27/1986 | EP0112844B1 Method and apparatus for encrypted radio communications |
| 08/26/1986 | US4608456 Digital audio scrambling system with error conditioning |
| 08/26/1986 | US4608455 Processing of encrypted voice signals |
| 08/19/1986 | CA1210142A1 Fm television signal receiving circuit |
| 08/12/1986 | US4606039 Spread spectrum coding method and apparatus |
| 07/23/1986 | EP0188030A2 Method of coding and decoding of audio information and apparatus for carrying out the method |
| 07/16/1986 | EP0187483A2 Improved video encryption system |
| 07/15/1986 | US4600942 Secure coding and decoding system and method for television program signals |
| 07/15/1986 | US4600941 Scrambling system for audio frequency signals |
| 07/08/1986 | CA1207154A1 Ram air combustion steering system for a guided missile |
| 07/02/1986 | EP0186056A2 Video decoder apparatus |
| 07/01/1986 | US4598169 System for detecting a marker signal inserted in an information signal |
| 06/24/1986 | CA1206591A1 Pin diode modulator |
| 06/24/1986 | CA1206528A1 Voice encryption and decryption system |
| 06/18/1986 | EP0184811A2 Method for the analogous radio transmission of speech |
| 06/03/1986 | CA1205540A1 Communications scrambling systems |
| 05/28/1986 | EP0181863A1 Tamper-resistant, expandable communications system. |
| 05/27/1986 | US4591673 Frequency or time domain speech scrambling technique and system which does not require any frame synchronization |
| 05/13/1986 | US4589016 FM television signal receiving circuit |
| 05/06/1986 | CA1204188A1 Privacy signal transmission system |
| 05/06/1986 | CA1204163A1 Secure mobile radio telephony |
| 05/06/1986 | CA1204162A1 Audio scrambler utilizing an auxiliary channel for synchronizing the descrambler |
| 04/29/1986 | CA1203848A1 Multi-layer encryption system for the broadcast of encrypted information |
| 04/23/1986 | EP0178809A1 High security pay television system |
| 04/23/1986 | EP0178758A1 Television picture and sound scrambler and method |
| 04/23/1986 | EP0178608A2 Subband encoding method and apparatus |
| 04/08/1986 | US4581765 Information security system |
| 04/08/1986 | US4581637 For use with an encoded television signal |
| 03/25/1986 | US4578531 Encryption system key distribution method and apparatus |
| 03/11/1986 | US4575753 Method of and apparatus for scrambling and decoding television and similar signals with wobbulating trapping |
| 03/04/1986 | US4573648 Ram air combustion steering system for a guided missile |
| 02/25/1986 | US4573205 Technique for secure communications on FM radio channels |
| 02/25/1986 | CA1201178A1 Method of preparing electrical signals by means of a digital filtering device |
| 02/18/1986 | US4571615 Timing generator for sync suppressed television signals |
| 02/18/1986 | CA1200894A1 Multiple signal transmission method and system, particularly for television |
| 01/22/1986 | EP0168861A2 Video terminal with image line disarrangement |
| 01/15/1986 | EP0167531A1 Packetized ensemble modem. |
| 01/08/1986 | EP0167442A2 Secure communication system |
| 01/07/1986 | US4563702 Video signal scrambling and descrambling systems |
| 01/07/1986 | EP0060299A4 Multiple signal transmission method and system, particularly for television. |
| 12/24/1985 | US4560832 Telephone system |
| 12/18/1985 | EP0164983A2 System for enabling descrambling on a selective-subscription basis in a subscriber communication network |
| 12/05/1985 | WO1985005523A1 Tamper-resistant, expandable communications system |
| 12/03/1985 | CA1197588A1 Encryption system key distribution method and apparatus |
| 11/26/1985 | US4555805 Secure mobile telephone system |
| 11/05/1985 | US4551580 Time-frequency scrambler |
| 10/29/1985 | US4550222 Process for interception-protected frequency band compressed transmission of speech signals |
| 10/22/1985 | US4549308 Secure mobile radio telephony |
| 10/22/1985 | US4549075 Method for certifying the origin of at least one item of information stored in the memory of a first electronic device and transmitted to a second electronic device, and system for carrying out the method |
| 10/16/1985 | EP0158383A1 Device for deciphering and decoding television pictures coded according to the MAC standard and scrambled by application of circular permutations to the video signals |
| 10/15/1985 | US4547802 TV Scrambler/descrambler using serial memories |
| 10/08/1985 | CA1194981A1 Phase change dynamic scrambling |
| 10/02/1985 | EP0156428A1 Cryptophonic system for narrow-band connections |
| 10/01/1985 | CA1194570A1 Hierarchic arrangement for the verification and renewal of security date in electronic fund transfer systems |