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