| Patents for H04H 20 - Arrangements for broadcast or for distribution combined with broadcast (21,050) |
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| 01/23/1990 | US4896371 Synchronous AM transmission system having reduced self interference effects |
| 01/23/1990 | US4896354 Image reception system |
| 01/17/1990 | CN1038909A Digital deemphasis circuit |
| 01/09/1990 | US4893349 FM communication system with improved response to rayleigh-faded received signals |
| 01/09/1990 | US4893347 FM communication system with improved response to Rayleigh-faded companded signals |
| 01/03/1990 | CN1038558A Dynamic callback technique |
| 01/03/1990 | CN1038557A I-f stereo broadcasting system using nonlinear phase and amplitude modulations of upper and lower side bands |
| 12/28/1989 | WO1989012881A1 A method of evaluating digitally encoded traffic information received in a data telegram and radio receivers |
| 12/27/1989 | EP0347541A1 Method for digitally phase-modulating a carrier with data signals, and digital phase modulator for carrying out said method |
| 12/27/1989 | CA1264066A1 Remanent subcarrier component suppressing device for balanced modulator |
| 12/21/1989 | DE3820641A1 Verfahren zur auswertung von in einem datentelegramm digital codiert empfangener verkehrsnachrichten sowie rundfunkempfaenger A method for evaluation of traffic news received in a data telegram digitally encoded and rundfunkempfaenger |
| 12/21/1989 | DE3820640A1 Evaluation method for digital traffic messages |
| 12/20/1989 | EP0347401A2 Method of and system for identification and verification of broadcasted television and radio program segments |
| 12/20/1989 | EP0347355A1 Synchronised multi-topical information broadcasting permitting a reconfigurable listening strategy over a transmitter park and of radio programmes |
| 12/14/1989 | DE3818371A1 Device for the selective switching of the connections between a data transmission channel and a plurality of playback devices |
| 12/13/1989 | EP0345365A1 Digital deemphasis circuit |
| 12/12/1989 | US4887308 Broadcast data storage and retrieval system |
| 12/12/1989 | US4887297 Apparatus for processing stereo signals and universal AM stereo receivers incorporating such apparatus |
| 12/12/1989 | US4887269 Apparatus for the reception of radio broadcasted digital signals |
| 12/05/1989 | US4885795 Hospital digital data transfer system |
| 12/05/1989 | US4885775 Information display scheme for subscribers of a subscription television system |
| 11/28/1989 | US4884139 Method of digital sound broadcasting in television channels with spectrum interlacing |
| 11/21/1989 | US4882773 Audio microphone system with digital output and volume control feedback input |
| 11/14/1989 | US4881273 RDS system radio |
| 11/14/1989 | US4881241 Method and installation for digital communication, particularly between and toward moving vehicles |
| 11/02/1989 | WO1989010670A1 Dynamic callback technique |
| 11/02/1989 | WO1989010662A1 Communication process and device, by sub-carriers integrated in an analog or digital signal |
| 11/02/1989 | EP0339329A2 Radio receiver with a decoder |
| 11/02/1989 | EP0339078A1 Broadband local area network |
| 10/26/1989 | DE3812120A1 Car radios integrated insert for storing and for receiving traffic announcements |
| 10/25/1989 | EP0338917A1 Communication method and device with subcarriers integrated in an analogous or digital signal |
| 10/25/1989 | EP0254743A4 Pay-per-view catv system. |
| 10/24/1989 | US4876617 Signal identification |
| 10/24/1989 | US4876592 System for merchandising and the evaluation of responses to broadcast transmissions |
| 10/18/1989 | EP0337609A2 Radio data system receivers |
| 10/05/1989 | DE3810180A1 Broadcast receiver, particularly vehicle receiver |
| 10/05/1989 | DE3810179A1 Broadcast receiver, particularly vehicle receiver |
| 10/05/1989 | DE3810178A1 Broadcast receiver, particularly vehicle receiver |
| 10/05/1989 | DE3808657A1 Information distribution system |
| 10/04/1989 | EP0335846A1 Cellular digital mobile radio system with plural base station transmitters, and method of transmitting information in such a system |
| 10/04/1989 | EP0334842A1 Low noise and distortion fm transmission system and method |
| 09/20/1989 | EP0333194A2 Radio data system receiver |
| 09/19/1989 | CA1259661A1 Am stereo signal decoder |
| 09/14/1989 | DE3806972A1 Device for receiving, detecting and reproducing traffic radio announcements |
| 09/12/1989 | US4866779 Adaptive AM audio processor |
| 09/08/1989 | WO1989008357A1 Device for monitoring acoustic signal processing systems |
| 09/08/1989 | WO1989008355A1 Cellular digital mobile radio system with plural base station transmitters and method of transmitting information in such a system |
| 08/30/1989 | CN1035217A Fm stereophonic system having improved compatibility in presence of multipath |
| 08/29/1989 | US4862513 Radio receiver with two different traffic information decoders |
| 08/29/1989 | US4862159 Centralized system for selecting and reproducing perceptible programs |
| 08/16/1989 | EP0328385A2 A phase adjusting system for a radio communication system |
| 08/10/1989 | WO1989007374A1 Apparatus for transmitting information |
| 08/09/1989 | CN2042644U Telephone / broadcast remote transfer switch |
| 07/25/1989 | US4852154 Pay-per-view CATV system |
| 07/20/1989 | EP0227825A4 Electronic information dissemination system. |
| 07/18/1989 | US4850032 Simulcast data communications system |
| 07/18/1989 | US4850020 Asymmetrical sideband AM stereo transmission |
| 07/04/1989 | US4845751 Wireless stereo headphone |
| 07/04/1989 | US4845750 Multiple function control circuit for an AM stereo receiver |
| 06/29/1989 | DE3743213A1 VHF Receiver |
| 06/22/1989 | DE3741840A1 Method for the automatic identification and arbitrarily reproducible recording of traffic announcements, device for carrying out the method and use of the method |
| 06/20/1989 | CA1256197A1 Subscription control for television programming |
| 06/14/1989 | EP0320181A2 CATV system with shared fibre optic link |
| 06/07/1989 | EP0319356A2 Matrix switch |
| 06/07/1989 | EP0318617A1 Apparatus for processing stereo signals and universal AM stereo receivers incorporating such apparatus |
| 05/23/1989 | US4833715 FM stereo receiver |
| 05/18/1989 | WO1989004567A1 Broadband local area network |
| 05/10/1989 | EP0315294A2 Asymmetrical sideband am stereo transmission |
| 05/10/1989 | EP0314995A2 RDS receiver |
| 05/10/1989 | CN1032892A Computer-controlled automatic playback broadcast system |
| 05/09/1989 | US4829372 Presentation player |
| 05/09/1989 | CA1253920A1 Process and device for the radio transmission of coded data superimposed on a traditional frequency- modulated broadcast |
| 05/03/1989 | EP0314572A2 Closed circuit television system having seamless interactive television programming and expandable user participation |
| 05/03/1989 | CN2037125U Auto-control switch for broadcasting audio-frequency signal of loud speaker |
| 05/02/1989 | US4827515 Digital demodulator |
| 04/27/1989 | DE3734320A1 Device, in particular for motor vehicles, for listening to already broadcast ARI or RDC messages |
| 04/27/1989 | DE3734084A1 Method of reproducing multichannel sound signals |
| 04/18/1989 | US4823390 FM stereo generator |
| 04/18/1989 | US4823298 Circuitry for approximating the control signal for a BTSC spectral expander |
| 04/11/1989 | US4821329 Audio switch device with timed insertion of substitute signal |
| 04/04/1989 | US4819268 Transmitter having means for controlling undesired out-of-band radiation |
| 03/29/1989 | EP0308520A1 Digital-Demodulator |
| 03/28/1989 | US4817151 Selective decoder for compatible FM stereophonic system utilizing companding of difference signal |
| 03/23/1989 | WO1989002682A1 Signal processing apparatus and methods |
| 03/21/1989 | US4815132 Stereophonic voice signal transmission system |
| 03/09/1989 | WO1989002199A1 Low noise and distortion fm transmission system and method |
| 03/09/1989 | WO1989002198A1 Fm communications system with improved response to rayleigh-faded received signals |
| 03/09/1989 | WO1989002195A1 Device for coding and decoding sound broadcast signals |
| 03/09/1989 | DE3728217C1 Interface device for a cable television network interface point |
| 03/08/1989 | EP0110994B1 Am stereo receiver |
| 03/02/1989 | DE3827310A1 Rundfunkdatensystem (rds)-empfaenger und verfahren zur steuerung eines derartigen empfaengers Radio Data System (RDS) receiver and method for controlling of such a receiver |
| 03/01/1989 | EP0305172A2 Radio data system receivers |
| 03/01/1989 | EP0304799A2 Apparatus for demodulating a biphase signal |
| 03/01/1989 | CN1031458A Presentation player |
| 02/28/1989 | US4807961 Local area network system |
| 02/22/1989 | EP0304147A2 Transmitter having means for controlling out-of-band radiation |
| 02/09/1989 | DE3725487A1 Radio signal programme information transmission system e.g. for car |
| 02/07/1989 | US4803727 Transmission system |
| 02/02/1989 | DE3723343A1 Method for transmitting an additional digital signal in an FM broadcast signal |
| 01/24/1989 | CA1249341A1 Optical local area network employing microwave modulation techniques |