| Patents for H04H 20 - Arrangements for broadcast or for distribution combined with broadcast (21,050) |
|---|
| 12/01/1981 | CA1113545A1 Simulcast transmission system having phase-locked remote transmitters |
| 11/24/1981 | US4302771 Wire broadcasting system with subscriber controlled switched program selection |
| 11/24/1981 | US4302626 Low frequency AM stereophonic broadcast and receiving apparatus |
| 11/17/1981 | US4301331 Composite limiting sum and difference circuitry for extending the reception area of a frequency modulated stereo radio transmitter |
| 10/01/1981 | WO1981002822A1 Am stereophonic decoder |
| 09/22/1981 | CA1109524A1 Simulcast transmission system |
| 09/01/1981 | US4287388 Drive-in theatre sound distribution system |
| 08/11/1981 | CA1106766A1 Simultaneous interpretation apparatus |
| 08/05/1981 | EP0033218A1 A message broadcasting and/or receiving system |
| 08/04/1981 | US4282401 System for transmission and reception of discrete four channel stereo |
| 07/28/1981 | US4281217 Apparatus and method for the identification of specially encoded FM stereophonic broadcasts |
| 07/14/1981 | US4278839 Tangent function generator for AM stereo |
| 07/01/1981 | EP0031014A1 Telecommunication system |
| 06/30/1981 | US4276572 Automatic message announcement system |
| 06/16/1981 | US4274112 Switching matrix for selectively connecting incoming signals to desired output paths |
| 05/26/1981 | US4270226 Remote control system |
| 05/19/1981 | US4268915 Universal automotive electronic radio with display for tuning or time information |
| 05/13/1981 | EP0028416A1 Broadband switching system |
| 05/13/1981 | EP0028415A1 Broadband coupling arrangement |
| 05/05/1981 | US4266093 Compatible four channel radio broadcast and receiving system |
| 04/28/1981 | US4264784 Stereophonic coder employing a multilevel switching system for the generation of the stereophonic signal |
| 04/22/1981 | EP0027109A1 Method of transmitting from a radio transmitter remote control signals for recording information on the receiver side |
| 03/17/1981 | US4256389 Method and system of controlling sound and effects devices by a film strip |
| 03/17/1981 | CA1097753A1 Pulse controlled switching circuits |
| 03/10/1981 | US4255814 Simulcast transmission system |
| 03/10/1981 | CA1097409A1 Electronic solid state switching device |
| 02/24/1981 | US4252995 Radio broadcasting system with transmitter identification |
| 02/19/1981 | WO1981000497A1 Tangent function generator for am stereo |
| 02/17/1981 | CA1095992A1 Compatible am stereo broadcast system |
| 02/11/1981 | EP0023562A1 Common wave radio network |
| 02/03/1981 | US4249039 Dual-modulation receiving apparatus |
| 02/03/1981 | US4249038 Stereo decoder with 19KHz-pilot suppression and improved oscillator phase locking |
| 01/27/1981 | CA1094641A1 Secure sca broadcasting system including subscriber actuated portable receiving terminals |
| 01/21/1981 | EP0022453A1 Method of avoiding interference disturbances in radio transmission to a mobile transmit/receive apparatus situated in the radiofield of two synchronous or quasi-synchronous common frequency transmitters, and device for carrying out the method |
| 01/20/1981 | US4246440 Radio broadcasting system with code signalling |
| 01/07/1981 | EP0020893A1 Radio network |
| 01/07/1981 | EP0020878A1 Service integrated information transmission and switching system for sound, picture and data |
| 12/09/1980 | US4238642 Angle-modulated stereo system |
| 11/26/1980 | EP0019466A2 Signal generating apparatus for independent sideband (ISB) AM stereo radio transmitters |
| 11/25/1980 | US4236042 Compatible AM stereo system employing a modified quadrature modulation scheme |
| 11/04/1980 | US4232189 AM Stereo receivers |
| 10/02/1980 | WO1980002093A1 Method of transmitting from a radio transmitter remote control signals for recording information on the receiver side |
| 09/30/1980 | US4225751 Variable-angle, multiple channel amplitude modulation system |
| 09/16/1980 | US4223405 Multitransmitter digital signaling system |
| 09/02/1980 | US4220818 AM Stereo transmitter |
| 08/20/1980 | EP0014348A1 Method of transmitting a stereophonic signal via two separate sound carriers contained in a television signal, as also a decoder for deriving right and left information from a stereophonic signal thus transmitted |
| 08/19/1980 | US4218705 Delay compensator for a television signal |
| 08/19/1980 | US4218586 Compatible AM stereo broadcast system |
| 06/24/1980 | US4209663 Drive-in theater audio system |
| 06/03/1980 | US4206317 Reduction of adjacent channel interference |
| 04/01/1980 | US4196310 Secure SCA broadcasting system including subscriber actuated portable receiving terminals |
| 03/18/1980 | US4194154 Narrow bandwidth network compensation method and apparatus |
| 03/18/1980 | US4194088 Modulation monitor for AM stereophonic broadcasts |
| 03/11/1980 | US4192970 Reduction of adjacent channel interference |
| 03/11/1980 | US4192968 Receiver for compatible AM stereo signals |
| 02/26/1980 | US4190737 Compatible four channel FM system |
| 02/12/1980 | US4188582 Simulcast transmission system having phase-locked remote transmitters |
| 01/29/1980 | CA1070768A1 Wired broadcasting systems |
| 01/22/1980 | US4185171 Compatible single sideband system for AM stereo broadcasting |
| 01/15/1980 | US4184046 Compatible single sideband system for AM stereo |
| 01/09/1980 | EP0006622A2 Circuit for selectively through-connecting or blocking broad-band signals |
| 01/08/1980 | US4182932 A-m stereo system |
| 12/25/1979 | US4180748 Electronic solid state switching device |
| 12/11/1979 | US4178549 Recognition of a received signal as being from a particular transmitter |
| 11/27/1979 | CA1067161A1 Quadrature multiplying four-channel demodulator |
| 11/20/1979 | CA1066781A1 Universal automotive electronic radio |
| 10/30/1979 | US4172966 AM stereophonic receiver |
| 10/17/1979 | EP0004702A1 Simulcast transmission system having phase-locked remote transmitters |
| 10/09/1979 | US4170716 AM stereo receiver with correction limiting |
| 10/09/1979 | CA1064110A1 Wired broadcasting systems |
| 10/02/1979 | US4169968 Noise protection circuit for am stereo cosine correction factor |
| 09/11/1979 | CA1062342A1 Stereophonic signal demodulator |
| 09/05/1979 | EP0003867A1 AM stereophonic receiver |
| 08/28/1979 | CA1061421A1 Decoder for four channel fm stereophonic composite signal |
| 08/14/1979 | US4164624 Demodulation circuits of FM stereophonic receivers |
| 08/14/1979 | US4164623 AM stereo receiver with improved correction signals |
| 08/08/1979 | EP0003388A1 Noise protection circuit for an AM stereo cosine correction factor and method for demodulating the AM stereo signal |
| 06/26/1979 | US4159398 Stereo presence signal for an AM stereo system |
| 06/26/1979 | US4159396 AM stereo receiver having signal-controlled corrector |
| 06/26/1979 | CA1057357A1 Compatible am stereophonic receivers |
| 06/12/1979 | CA1056465A1 Stereophonic demodulator apparatus |
| 05/29/1979 | US4156847 Method and apparatus for confirming transmission in bidirectional CATV system |
| 05/08/1979 | US4153847 Logic circuits |
| 05/08/1979 | CA1054228A1 Multi-mono fm transmission and reception system |
| 04/10/1979 | CA1052446A1 Wired broadcasting system with a wideband coaxial cable for multi-channel signals |
| 04/03/1979 | US4148060 Apparatus for distributing television signal with stereophonic audio via satellite |
| 03/13/1979 | CA1050616A1 Inductive carrier communication systems |
| 01/16/1979 | US4135158 Universal automotive electronic radio |
| 01/09/1979 | US4134074 Dynamic transient response filter |
| 11/14/1978 | CA1042515A1 Information signal transmitting system |
| 11/07/1978 | US4124779 Dual channel communications system particularly adapted for the AM broadcast band |
| 11/07/1978 | CA1041912A1 Wired broadcasting systems |
| 10/17/1978 | CA1040714A1 Transmitting and reproducing system for a plurality of audio information signals |
| 09/19/1978 | US4115663 Doubly balanced demodulator for multiple channel FM stereo system |
| 09/19/1978 | CA1038933A1 Compatible am stereophonic transmission system |
| 09/05/1978 | US4112369 Secure SCA broadcasting system including subscriber actuated portable receiving terminals |
| 09/05/1978 | US4112259 Automatic phase controlled pilot signal generator |
| 08/29/1978 | US4110708 Multichannel modulation system including automatic gain shifter |
| 08/08/1978 | US4105868 AM stereophonic transmission system |
| 07/25/1978 | US4103235 Two-tone attention signal broadcasting system |