Newsgroups: rec.video.cable-tv Date: 1993-02-02 09:59:50 PST ________________________________________________________________________ The Somewhat-Complete List of CATV/Satellite/Scrambling Patents ________________________________________________________________________ The following patents have been issued to their respective companies from roughly 1970 through August of 1992. The patents listed here in some way relate to the area of televison encryption and/or distribution. Note that there are MANY other patents issued in this area to other companies, individuals, etc. but I've chosen to include only the "major" players in the Satellite / CATV industry. Copies of patents may be obtained from the U.S. Patent Office at a charge of US$3.00 for each patent. Send requests to Commissioner of Patents and Trademarks, United States Patents and Trademarks Office, Washington, D.C. 20231. Also note that almost every state has at least one Official Patent and Trademark Depository (usually at a large institution or a start library) which has copies of all patents on microfilm. See 'comp.patents' for more information. Many other libraries may also have the "Official Gazette", the weekly publication from the U.S. Patent Office which provides one drawing and one paragraph from each patent issued during the week. Armed with this list, the "Gazette", and a few hours in the library, you can get a better idea of the nature of the patents before ordering the full text from the Patent Office. If someone is willing to donate FTP space, I can make a version of this list available which has abstracts for any related patents issued in the last two or three years. Something of that size is simply too big to post to the group. Hope this is interesting / helpful to someone. Regards, Ed ________________________________________________________________________ (Note that the titles of some patents may be truncated...) GENERAL INSTRUMENT CORPORATION 5115467: Signal Encryption Apparatus For Generating Common And Distinct Keys 5111504: Information Processing Apparatus With Replaceable Security Element 5107360: Optical Transmission Of RF Subcarriers In Adjacent Signal Bands 5091936: System For Communicating TV Signals Or A Plurality Of Digital Audio 5083293: Prevention Of Alteration Of Data Stored In Secure IC Chip Memory 5081680: Initial Reporting Of Remotely Generated Data 5054067: Block-cipher Cryptographic Device Based Upon A Pseudorandom Nonlinear 5053992: Prevention Of Inspection Of Secret Data Stored In Encapsulated IC 5046093: CATV Subscriber Apparatus With Intelligent Remote Control 5038402: Apparatus And Method For Providing Digital Audio In The FM Broadcast 5036537: Geographic Black-out Method For Direct Broadcast Satellite System 5027399: Signal Switching Apparatus 5020129: Addressable Control System For CATV Program Distribution 5014310: Video Scrambling And Descrambling By Varying Sequence Of Segments In 5003591: Functionally Modifiable Cable Television Converter System 4989245: Controlled Authorization Of Descrambling Of Scrambled Programs 4982430: Bootstrap Channel Security Arrangement For Communication Network 4979230: Up-conversion Homodyne Receiver For Cable Television Converter With 4975951: IPPV Programming Distribution Control System 4956862: Method Of Providing Sound Privacy System Compatible With Mono And BTSC 4933898: Secure Integrated Circuit Chip With Conductive Shield 4928309: Method And Apparatus For Descrambling A Television Signal 4926477: Cable Television Descrambler 4920566: Dual Loop Sinewave Descrambler And Method Of Descrambling 4914695: Method And Apparatus For Frequency Control Of Multiple Oscillators 4864615: Reproduction Of Secure Keys By Using Distributed Key Generation Data 4864613: Broadband Converter/descrambler Interface For Cable TV 4860379: Data Communications System 4860353: Dynamic Feedback Arrangement Scrambling Technique Keystream Generator 4841569: Secure Video Distribution System 4821097: Apparatus And Method For Providing Digital Audio On The Sound Carrier 4815129: Video Encryption System 4803725: Cryptographic System Using Interchangeable Key Blocks And Selectable 4783846: Switchable Signal Source Module For Use With Cable Television Converter 4771456: Cable Television Channel Selector/descrambler For Use With Cable-ready 4739510: Direct Broadcast Satellite Signal Transmission System 4712239: Security Arrangement For Downloadable Cable Television Converters 4710955: Cable Television System With Two-way Telephone Communication Path 4694491: Cryptographic System Using Interchangeable Key Blocks And Selectable 4689619: Method And Apparatus For Polling Subscriber Terminals 4685131: Program Blocking Method For Use In Direct Broadcast Satellite System 4672440: Scrambled Signal Detector 4646150: Apparatus And Method For Stereo Television Sound 4638356: Apparatus And Method For Restricting Access To A Communication Network 4628358: Television Signal Encryption System With Protected Audio 4603349: Cable Television System With Stereo Sound Reproduction 4599647: Receiver With Interface For Interaction With Controller-decoder 4598318: Video Encryption System 4571615: Timing Generator For Sync Suppressed Television Signals 4562465: Adaptive Video Descrambling System 4558464: Address-programmable CATV Converter 4533948: CATV Communication System 4520508: Subscriber Terminal For Monitoring Radio-frequency Signal Ingress Into 4494111: Frequency Agile Security Apparatus 4477800: Security System 4477799: Security Apparatus With Alarm Search And Verification Capability 4404514: Fault Detection System As For Locating Faulty Connections In A Cable OAK INDUSTRIES 4709266: Satellite Scrambling Communication Network Using Geographically 4688247: Pay TV Scrambling By Audio Encryption 4633309: Cable Television Master/slave Decoder Control 4568974: Video Scrambling By The Application Of A Variable Periodic Scrambling 4531021: Two Level Encripting Of RF Signals 4531020: Multi-layer Encryption System For The Broadcast Of Encrypted 4454543: Dynamic Video Scrambling 4447828: Phase Change Dynamic Scrambling 4425579: CATV Converter With Keylock To Favorite Channels 4424532: Coding And Decoding System For Video And Audio Signals 4353088: Coding And Decoding System For Video And Audio Signals 4340906: Video Signal Coding By Video Signal Polarity Reversal On The Basis Of 4336553: Method Of Coding Audio And Video Signals 4323922: Television Coding System With Channel Level Identification 4313132: Cable TV Security Means 4145717: Subscription TV Audio Carrier Recovery System 4135157: Pole Mounted Converter 4112464: Subscription TV Decoder Logic System 4024575: CATV Sine Wave Coding System 3919463: Pay TV System Using UHF Input 3882266: Apparatus For Converting Selected Channels 3857997: Cable Converter With Phase Lock Loop Techniques 3826863: Subscription Television System Using Audio And Video Carrier Reversal 3789131: Selective Coding System For Subscription Television PIONEER ELECTRONICS CORPORATION 5125028: Television Signal Scrambling Method And Apparatus 5113441: Method For Scrambling A Television Signal And Method And Apparatus For 5113439: CATV Terminal And Video Apparatus Having A Noise Eliminating Circuit 5103477: Method And Apparatus For Descrambling A Television Signal 5091937: CATV Terminal Unit 5065235: CATV Terminal Unit Including Memory For Storing Remote Control Codes 5053884: Control Apparatus For Selectively Inhibiting Looking/listening In CATV 5031213: CATV Terminal Unit 5031045: CATV Terminal Device Having A Program Booking Timer Function 5029340: CATV Terminal Unit Having An Improved Descrambling Operation 5008934: CATV Transmission System Using Scrambled Signals 4962529: Scrambling Method For TV Picture 4961109: Chargeable Program Receiving Limit Setting System In Two-way Cable 4953208: CATV System Transmitting A Scrambled Television Signal 4949170: Video Information Transmission Service System And Head End Device 4928168: Billing Data Display System And Terminal Used Therein For A Closed 4926256: Billing Data Display System For A Closed Circuit Television System 4839922: CATV Scrambling And Descrambling Method 4794643: Method For Developing A Key Signal For Descrambling In Television 4792971: Selective Viewing Control System For CATV 4779129: FM Simultaneous Broadcast System For CATV 4769838: Community Antenna Television Reception Controlling Apparatus 4740835: Wire-tap Preventing Apparatus For Community Antenna Television 4737990: Unauthorized Channel Jamming Signal Applying Method For CATV System 4716410: CATV Data Transmission Method 4713840: Data Communication System 4710971: Channel Selecting Device For CATV Terminal Unit 4651204: Jamming Signal Generating Circuit 4648122: Community Antenna Television Communication System 4644396: Gate Circuit For Central Control Of CATV System 4641363: Community Antenna Television Communication System 4616214: Security System 4584684: Data Transmission Method 4558358: Cable Network Monitoring System For CATV System 4550341: Unauthorized Observation Preventing Device For CATV System 4455570: CATV System 4454538: Data Communication In CATV System 4439784: Power Cutting Device For Terminal Units Of CATV System 4427995: Fail-safe CATV System Center Facility 4408345: Remote Line Monitoring Method And Device For CATV System 4385314: Polling Pattern Generator For CATV System 4365267: Passive Data Monitor For Use With Polling Pattern Generator In CATV 4365249: Line Monitoring Device In Two-way Data Communication System 4322745: Television Signal Scrambling Method For CATV System 4317215: Tuning System For CATV Terminal 4313133: Scrambling And Descrambling System In CATV Broadcasting System 4270212: CATV Converter 4245245: Interactive CATV System 4149158: Security System For CATV Terminal 4145716: Descrambling Device In CATV System 4109281: Terminal Device For CATV 4064536: Video Scrambler And Descrambler Apparatus SCIENTIFIC-ATLANTA 5109286: CATV Reverse Path Manifold System 5077607: Cable Television Transaction Terminal 5068893: Television Signal Processing Network For Subscription Television 5058160: In-band Controller 5053883: Terminal Polling Method 5029207: External Security Module For A Television Signal Decoder 5014309: Off-premises Cable Television Channel Interdiction Method And Apparatus 5003384: Set-top Interface Transactions In An Impulse Pay Per View Television 5001554: Terminal Authorization Method 4994908: Interactive Room Status/time Information System 4991011: Interactive Television Terminal With Programmable Background Audio Or 4987486: Automatic Interactive Television Terminal Configuration 4963966: CATV Distribution System, Especially Adapted For Off-premises Premium 4924498: Method And Apparatus For Improving Video Scrambling And Employing 4922532: Sync Suppression Scrambling And Descrambling Of Television Signals For 4912760: Off-premises Cable Television Channel Interdiction Method And Apparatus 4912721: Cable Television Spread Spectrum Data Transmission Apparatus 4890321: Communications Format For A Subscription Television System Permitting 4890319: Method For Controlling Copying Of Protected Information Transmitted 4888799: Scrambling Of Signals By Inversion 4885775: Information Display Scheme For Subscribers Of A Subscription 4866770: Method And Apparatus For Communication Of Video, Audio, Teletext, And 4829569: Communication Of Individual Messages To Subscribers In A Subscription 4817142: Restoring Framing In A Communications System 4792972: Remote Programming Of CATV Channel Authorization Unit 4792848: Cable Television Impulse Pay Per View System 4748667: Jamming Signal Scrambling And Descrambling Systems For CATV 4691353: Scrambling Systems For CATV 4642688: Method And Apparatus For Creating Encrypted And Decrypted Television 4636852: Scrambling And Descrambling Of Television Signals For Subscription TV 4567517: Descrambler For Sync-suppressed TV Signals 4523228: Sync Suppression Scrambling Of Television Signals For Subscription TV 4471380: Scrambling And Descrambling Of Television Signals For Subscription TV 4466017: Sync Suppression Scrambling Of Television Signals For Subscription TV TOCOM, INC. 4606072: Master/slave Converter System 4575755: Video Encoder/decoder System 4574305: Remote Hub Television And Security Systems 4536791: Addressable Cable Television Control System With Video Format Data 3993955: Method Of And Apparatus For Establishing Emergency Communications In A 3990012: Remote Transceiver For A Multiple Site Location In A Two-way Cable 3846703: Noise Control System For Transmission Network 3803491: Communications System 3794922: Data Sampling Communication System ZENITH ELECTRONICS, INC. 5052047: Modulator-remodulator With Common Local Oscilator 5018197: Secure Video Decoder System 4995080: Television Signal Scrambling System And Method 4947429: Pay Per View Television Signaling Method 4944006: Secure Data Packet Transmission System And Method 4910767: Ani Auto Dialer With Carrier Current Interface 4885794: Method And Apparatus For Protection Of Channel Access In Broadband 4885776: Television Signal Encoder With Reduced Transient Switching Effects 4876718: Secure Data Packet Transmission System And Method 4837820: Hybrid CATV Scrambling System 4817144: Secure TV Scrambling System Using Framing Code Switching 4807023: Mapping Method For Impulse Pay Per View System 4802213: Sound Masking In Phase Reversal TV Scrambling System 4802212: Method And Device For Preventing Tape Piracy 4790011: Auto Clamp For Modulator For Suppressed Sync Signals 4790010: Enhanced Scrambling Method And System For TV Signals 4771458: Secure Data Packet Transmission System And Method 4768229: Restrictive Access Control System 4766497: If Circuit With Reduced Sound Attenuation For Cable Signals 4759061: Technique For Toggling Coding Mode In A Television Signal Encoder 4755872: Impulse Pay Per View System And Method 4748501: Cable Converter For Television Signals With Stereo Audio Signal 4742513: Adaptive Window Multiplexing Technique 4717970: Video System With Programmable Vcr 4712237: Method And Apparatus For Unscrambling Sync-suppressed Television 4706284: Television Signal Data Transmission System 4706283: Television Signal Scrambling System 4703354: Non-linear Sync Signal Processing Circuit 4691354: Vertical Interval Data Blanker 4688246: CATV Scrambling System With Compressed Digital Audio In Synchronizing 4677685: Method And Apparatus For Downloading A Code Defining The Channel 4667232: Synchronizing Pulse Restoration Circuit 4654705: Two Channel Audio Scrambling System 4636853: Dynamic Audio Scrambling System 4633316: Stable Low Cost 4.5 Mhz Remodulator 4630113: Baseband CATV Decoder With Stereo Bypass 4612571: Constant Z Bandswitched Input Filter 4611242: Two Mode Scrambling System Using Identifier Pulse In Vertical Blanking 4602284: Adapter For Rendering A Non-addressable CATV Converter Addressable 4600921: Full-field Teletext System With Dynamic Addressability 4598313: Television Signal Scrambling System 4586078: CATV Upstream Signal Transmission At Nonharmonic Video Frequencies 4581637: Pin Diode Modulator 4574163: Digital Radio Telephone 4571560: Switched Bandpass Filter 4558360: Decoder Lockout Defeat Circuit 4554581: STV Decoder With Improved Data Signal Recognition Capability 4554579: Two-way CATV System With AML Commands 4553161: Upstream Data Packet Time Slot Synchronization With Downstream Vbi For 4528663: Peak Load Access In A Two-way CATV Contention System 4527194: Channel Assignment For CATV System 4520507: Low Noise CATV Converter 4514761: Data Encryption Technique For Subscription Television System 4503462: Automatic Homing System For A Subscription Television Signal Decoder 4489347: Sine-wave Decoding Technique 4476488: Control Circuit For CATV Alert System 4467353: Television Signal Scrambling System And Method 4461032: CATV Service Controller 4460922: Memory Select System For An STV Decoder 4458268: Sync Displacement Scrambling 4408225: Subscription Television Decoder 4395734: Remote Muting For CATV/STV Converters 4388645: Teletext Communication System With Timed Multipage Local Memory 4375651: Selective Video Reception Control System 4370675: Doorbell Actuated Television Security System 4292650: STV Subscriber Address System 3780213: Air Code Burst Generator 3737785: Solid-state Signal Distribution System 3732355: Inhibitable Random Pulse Generator 3538242: Subscriber Communition System 3531583: Subscription Television Receiver 3531582: Subscription Television Receiver With Removable Code-bearing Element 3480726: Adjustable Switching Apparatus 3475547: Subscription Television Receiver With Program Use Recording 3466385: Correlation Testing Arrangement For A Subscription Television Receiver 3453380: Variable Delay Network