Patents for H04H 20 - Arrangements for broadcast or for distribution combined with broadcast (21,050) |
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08/06/1991 | US5038403 Simulcast system with minimal delay dispersion and optimal power contouring |
08/06/1991 | US5038402 Apparatus and method for providing digital audio in the FM broadcast band |
07/31/1991 | EP0438463A1 High data rate simulcast communication system. |
07/30/1991 | US5036389 Satellite controlled audience polling system |
07/30/1991 | CA1287115C Fm/fmx stereophonic receiver |
07/23/1991 | US5034902 Method and system for ascertaining the consumption habits of a test population |
07/23/1991 | US5034808 Unified automatic video and audio signal control and distribution system |
07/23/1991 | US5034807 System for evaluation and rewarding of responses and predictions |
07/17/1991 | EP0436875A2 Common wave radio system |
07/16/1991 | US5033112 Closed loop, programmable power and communication system |
07/11/1991 | WO1991010299A1 Reception aerial process and system |
07/09/1991 | US5031230 Frequency, phase and modulation control system which is especially useful in simulcast transmission systems |
07/03/1991 | EP0435400A1 Supply power injector for wideband distribution network |
07/02/1991 | US5029333 Communications system |
07/02/1991 | US5029014 Ad insertion system and method for broadcasting spot messages out of recorded sequence |
07/02/1991 | CA1285648C Electronic information dissemination system |
06/27/1991 | WO1991008810A1 Method of evaluating data |
06/26/1991 | EP0433904A2 RDS broadcast receiver with a device for preferential reception of programs with the same country code |
06/26/1991 | EP0433596A2 Method and apparatus for suppressing undesired automatic transmitter change-over |
06/25/1991 | US5027400 Multimedia bidirectional broadcast system |
06/19/1991 | EP0432904A2 Cable television connection system |
06/19/1991 | EP0432399A2 Broadband transmission system |
06/18/1991 | CA1285031C Asymmetrical sideband am stereo transmission |
06/13/1991 | WO1991008626A1 Method of labelling a broadcast signal |
06/13/1991 | WO1991008625A1 Process and device for generating an entertainment audio signal interrupted by advertising audio signals |
06/13/1991 | WO1991008620A1 Simulcast communication system |
06/12/1991 | EP0431694A1 FM receiver for radio data signals |
06/11/1991 | US5023933 Superheterodyne SCA receiver and method for the manufacture thereof |
06/11/1991 | US5023909 Multi-system AM stereo receiver having preferred mode of operation |
06/11/1991 | US5023609 Digital deemphasis circuit |
06/08/1991 | WO1991009479A1 Communications system |
06/05/1991 | EP0430711A2 Video network |
06/05/1991 | EP0430405A2 Digital switcher for routing signals |
06/02/1991 | CA2030895A1 Digital switcher for routing signals |
05/31/1991 | WO1991008652A1 Satellite based simulcast paging system |
05/29/1991 | EP0429200A2 Broadcast networks |
05/29/1991 | EP0429000A2 RDS broadcast receiver with a device for country-specific interpretation of RDS data |
05/29/1991 | EP0428866A2 Method and apparatus for suppressing transmitter change-over in RDS receivers due to local disturbances |
05/28/1991 | US5020143 Vehicular radio receiver with stored detour data |
05/28/1991 | US5020134 CATV signal distribution system and local status monitor therefor |
05/22/1991 | EP0428252A2 A system for controlling access to broadcast transmissions |
05/22/1991 | EP0427831A1 Improvements relating to entertainment and services systems |
05/16/1991 | WO1991007029A1 Radio receiver, in particular for vehicles |
05/14/1991 | CA1284211C Cable television system selectively distributing pre-recorder video and audio messages |
05/08/1991 | EP0426542A1 Method of instant validation of actions in the field of television programmes and device for carrying out this method |
05/08/1991 | DE3936577A1 Rundfunkempfaenger, insbesondere fahrzeugempfaenger Rundfunkempfaenger, especially fahrzeugempfaenger |
05/07/1991 | US5014344 Method for synchronizing the transmissions in a simulcast transmission system |
05/07/1991 | US5014318 Apparatus for checking audio signal processing systems |
05/07/1991 | US5014316 Compatible quadrature amplitude modulation detector system |
05/07/1991 | US5013038 method of evaluating data relating to a common subject |
05/02/1991 | EP0425347A1 Portable electronic device for making a public loyal to a media or similar |
04/30/1991 | US5012510 Dynamic callback technique |
04/25/1991 | WO1991006914A1 Portable electronic device to establish public loyalty to a media or similar |
04/24/1991 | EP0423381A1 Apparatus for transmitting audio and/or digital information |
04/24/1991 | EP0138914B1 Fm stereophonic radio broadcasting system having s channel companding |
04/23/1991 | US5010399 Video transmission and control system utilizing internal telephone lines |
04/23/1991 | US5010317 Satellite based simulcast paging system |
04/16/1991 | US5008939 AM noise reducing |
04/11/1991 | DE3942320A1 Communication system esp. for salt mine - uses single frequency phase locked loop radio system at base stations connected by wire to central station |
04/03/1991 | EP0420448A2 Multi-system AM stereo receiver having preferred mode of operation |
03/27/1991 | EP0419137A2 Dynamically responsive cable television system with shared fibre optic link |
03/27/1991 | CN1012248B Method of generating amplitude-modulated isb transmission signal and apparatus for carrying out method |
03/26/1991 | US5003617 Simulcast broadcasting system and method |
03/26/1991 | CA2025085A1 Multi-system am stereo receiver having preferred mode of operation |
03/21/1991 | WO1991003891A1 Rf receiver having remote volume control |
03/19/1991 | US5001757 FM stereo tone detector |
03/19/1991 | US5001728 Method and apparatus for demodulating a biphase signal |
03/14/1991 | DE3929824A1 Two-band frequency converter for SHF range - has preamplifier, diplexer with filter function and local oscillator in two frequency branches |
03/14/1991 | DE3929245A1 RDS data continuous recording appts. - has head frequency controlled by RDS message, and speed set for all-day monitoring |
03/06/1991 | EP0415132A2 RDS broadcast receiver with device for automatically switching over to an alternative regional programme |
03/06/1991 | CN1011935B Controlled blend for am stereo receiver |
03/05/1991 | US4998278 Method and apparatus for scramble type broadcast receiving with contract management and scramble type broadcasting system |
02/21/1991 | DE3926984A1 Car radio and cassette player - monitors radio stations enabling automatic over riding of cassette player |
02/13/1991 | EP0412946A2 A demodulator for biphase, suppressed-carrier PSK signals |
02/13/1991 | EP0412286A2 Route-selective reproduction method for digitally coded messages transmitted from a transmitter to a vehicle receiver, and corresponding vehicle receiver |
02/13/1991 | CN2071405U Collineation transmission apparatus for wired radio and cable tv |
02/07/1991 | DE3925001A1 Portable traffic broadcast receiver - has pilot signal thresholding to actuate loudspeaker, warning sounder, or to store message |
02/05/1991 | US4991212 Frequency modulating |
02/05/1991 | US4991207 One-way address transmission system of PCM music |
02/05/1991 | US4991025 Arrangement for automatically switching a videorecorder on and off in the absence of a code signal but in presence of a FBAS signal |
02/05/1991 | CA1279924C Cryptographic system using interchangeable key blocks and selectable key fragments |
01/30/1991 | EP0410663A2 AM noise reducing |
01/30/1991 | EP0410036A1 Commodity information retrieval system |
01/29/1991 | CA2020901A1 Am noise reducing |
01/23/1991 | EP0409100A2 Process for radio-broadcasting and detecting a video signal with at least two associated audio signals, for the modulation and separate use of at least one of said audio signals, and related demodulation device |
01/17/1991 | DE3935183A1 Cable TV and audio signal transmission system - has advance head end coupled by cables to group subscriber supplied by central station |
01/16/1991 | EP0408236A2 Video transmission and control system utilizing internal telephone lines |
01/10/1991 | DE3929596A1 Controlling demodulators for EM signals - using combination of code stored in transmitted signal and mathematical model stored in microprocessor |
01/09/1991 | EP0270630A4 Signal matching signal substitution |
01/09/1991 | CN1048478A Improvements relating to entertainment and services systems |
01/09/1991 | CN1048473A Digital transmission system transmitter and receiver for use in transmission system, and record carrier obtained by means of transmitter in form of recording device |
12/27/1990 | WO1990016119A1 Cable identification system and method |
12/27/1990 | EP0403744A2 RDS broadcast receiver with empirically growing memory contents in its program memories |
12/26/1990 | CN1048136A Satellite tv communication system for audience polling and processing answers |
12/19/1990 | EP0402973A1 Digital transmission system, transmitter and receiver for use in the transmission system, and record carrier obtained by means of the transmitter in the form of a recording device |
12/19/1990 | EP0402809A2 Satellite television communication system for audience polling and processing answers |
12/19/1990 | EP0229127B1 Device for automatically switching on and off the recording function of a video recorder |
12/18/1990 | US4979217 Programmed audio controller |
12/17/1990 | WO1990016120A1 System with compact spectrum |
12/16/1990 | WO1990016136A1 Polyphonic coding |