Patents
Sitemap › H04 - Electric communication technique › H04K - Secret communication; Jamming of communication › H04K 1 - Secret communication
Patents for H04K 1 - Secret communication (16,771)
09/1985
09/25/1985EP0155762A2 Descrambler subscriber key production system utilizing key seeds stored in descrambler
09/24/1985CA1328501B Security System for SSTV Encryption
09/24/1985CA1194212A1 Security system for sstv encryption
09/24/1985CA1194164A2 Local orderwire facility for fiber optic communication system
09/17/1985CA1193668A1 Method of and apparatus for interception-protected frequency-band-compressed transmission of speech signals
09/17/1985CA1193667A1 Method of and system for safeguarded transmission of digital signals
08/1985
08/29/1985WO1985003830A1 Method and apparatus for subscription broadcast
08/20/1985US4536739 Apparatus for communication of instructing information
08/14/1985EP0151147A1 Security system for television signal encryption.
08/06/1985US4533948 CATV Communication system
07/1985
07/30/1985US4532636 Radio communications receivers
07/23/1985US4531020 Multi-layer encryption system for the broadcast of encrypted information
07/18/1985WO1985003180A1 Packetized ensemble modem
07/10/1985EP0148015A2 A method for cryptographic transmission of speech signals and a communication station for performing the method
07/02/1985US4527195 Apparatus for encoding and decoding information
06/1985
06/25/1985US4525844 Method for interchanging n partial bands
06/12/1985EP0143896A2 Television receiver with circuit for the descrambling of an analogue scrambled signal
06/11/1985CA1188739A1 Analog voice privacy device for a secure communications system
06/04/1985CA1188383A1 Method for interchanging n partial bands
05/1985
05/08/1985EP0140704A2 Television scrambling and descrambling method and apparatus
05/02/1985EP0139496A2 A radio transmission system for a phase modulation signal
04/1985
04/30/1985US4514852 Process for protected transmission of digital signals
04/30/1985CA1186380A1 Method for transpoting sub-bands
04/24/1985EP0138485A2 Radio reception system for a phase modulation signal
04/10/1985EP0136681A2 Method for encrypted information transmission
04/03/1985EP0136062A2 Apparatus for and methods of scrambling voice signals
03/1985
03/26/1985CA1184608A1 Method for transposing the frequency of sub-bands
02/1985
02/14/1985WO1985000718A1 Security system for television signal encryption
02/13/1985EP0133107A1 Apparatus for coding and decoding a broad-band transmission
02/12/1985CA1182595A1 Privacy communication system employing time/frequency transformation
01/1985
01/23/1985EP0132007A1 Authorising coded signals
01/23/1985EP0131983A2 Secure television transmission system
01/23/1985EP0131919A2 Voice privacy system
01/23/1985EP0131573A1 Ram air combustion steering system for a guided missile.
12/1984
12/27/1984EP0129299A2 Secure television transmission system
12/19/1984EP0128771A2 Timing generator for sync suppressed television signals
12/19/1984EP0128604A1 Scrambled television signals
12/05/1984EP0127383A1 Video signal scrambling and descrambling systems
12/05/1984EP0127382A1 Digital audio scrambling system with error conditioning
12/05/1984EP0127381A1 Key signal encryption and distribution system for controlling scrambling and selective, remote descrambling of television signals
11/1984
11/20/1984US4484027 Security system for SSTV encryption
10/1984
10/31/1984EP0123422A2 Apparatus for scrambling and unscrambling signals
10/09/1984US4476566 Frequency hopping radio communications apparatus having pseudo-random _channel selection
10/02/1984US4475208 Wired spread spectrum data communication system
09/1984
09/19/1984EP0119081A2 Apparatus for viewing scrambled or unscrambled TV signals
09/05/1984EP0117719A2 Method of decoding an encoded video signal and a receiving apparatus for decoding the signal
09/05/1984EP0117357A2 Digital signal composing circuits
09/05/1984EP0117276A2 Privacy communication apparatus
08/1984
08/22/1984EP0116402A2 Scrambling systems for audio frequency signals
08/22/1984EP0116082A1 Secure coding and decoding system and method for television program signals.
08/21/1984US4467139 Process and system for transmission of signed messages
08/02/1984WO1984002975A1 Ram air combustion steering system for a guided missile
08/01/1984EP0114520A2 Marker signal detecting systems
07/1984
07/31/1984US4463376 Television signal processing system for a wireless pay system
07/11/1984EP0112869A1 A subscriber video-tv system
07/11/1984EP0112844A1 Method and apparatus for encrypted radio communications.
07/11/1984EP0044845B1 Process and device for protecting the transmission of vocal signals
06/1984
06/27/1984EP0112158A2 Scrambling systems for audio frequency signals
06/27/1984EP0111937A2 Privacy signal transmission system
05/1984
05/16/1984EP0108151A1 Secret-speech device
05/08/1984US4447828 Phase change dynamic scrambling
05/08/1984CA1167155A1 Signal unscrambler
05/01/1984CA1166712A1 Cryptographic system using triple encipherment
04/1984
04/25/1984EP0105906A1 Audio scrambler utilizing an auxiliary channel for synchronizing the descrambler
04/17/1984US4443660 System and method for encrypting a voice signal
04/03/1984US4440976 Automatic selection of decryption key for multiple-key encryption systems
02/1984
02/28/1984US4434323 In a narrowband privacy communication system
02/28/1984US4434322 Coded data transmission system
02/21/1984US4433211 Privacy communication system employing time/frequency transformation
02/16/1984WO1984000656A1 Secure coding and decoding system and method for television program signals
02/08/1984EP0100260A1 Method to establish the origin of at least one bit of information stored in a memory of a first electronical device and transmitted to a second electronical device
02/02/1984WO1984000456A1 Secure mobile radio telephony
01/1984
01/31/1984US4429331 Video cipher processing system
01/19/1984WO1984000264A1 A subscriber video-tv system
12/1983
12/22/1983WO1983004461A1 Encryption system key distribution method and apparatus
12/22/1983WO1983004460A1 Methods and apparatus for distorting and recomposing a speech signal
12/07/1983EP0095923A2 Communications scrambling systems
11/1983
11/29/1983US4418425 Encryption using destination addresses in a TDMA satellite communications network
11/24/1983WO1983004151A1 Secret-speech device
11/22/1983CA1157525A1 Receiver for a frequency diversity radio communications system comprising interference assessment circuit and adaptive filter
11/09/1983EP0093549A2 CATV communication system
10/1983
10/27/1983WO1983003731A1 Audio scrambler utilizing an auxiliary channel for synchronizing the descrambler
10/18/1983US4411017 Secure mobile telephone system
10/18/1983US4410911 Multiple signal transmission method and system, particularly for television
10/18/1983CA1155518A1 Encoding of information
09/1983
09/07/1983EP0087565A1 Phase change dynamic scrambling
08/1983
08/30/1983US4401854 Simultaneous transmission of an analog message signal and a digital data signal
08/10/1983EP0085453A1 Electronic system for the secret transmission of audio signals
08/09/1983US4398296 Communication systems
08/09/1983US4398216 Multiple signal transmission method and system, particularly for television
08/09/1983US4398062 Apparatus for privacy transmission in system having bandwidth constraint
08/09/1983CA1151741A1 Method and apparatus for securing data transmissions
08/04/1983DE3202400A1 Method and device for enciphering and deciphering television or other video information
08/03/1983EP0084967A2 Radio communication system
08/02/1983US4397034 Low probability of intercept transmitting apparatus
08/02/1983US4396947 Apparatus for encoding of information
07/1983
07/12/1983US4393276 Fourier masking analog signal secure communication system
07/05/1983US4392241 Digital interface system
07/05/1983US4392021 Secure facsimile transmission system using time-delay modulation
07/05/1983CA1149484A1 Method and apparatus for securing data transmissions
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