| Patents for H04B 15 - Suppression or limitation of noise or interference (10,227) |
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| 12/05/1989 | US4885559 Electric noise absorber |
| 11/30/1989 | DE3916121A1 Light source for an optical communications system |
| 11/29/1989 | EP0343792A2 A noise elimination method |
| 11/23/1989 | EP0342285A1 Methods of detecting leakage of radio waves from outside an electromagnetically shielded building |
| 11/23/1989 | EP0342284A1 Electromagnetically shielded building with system for detecting leakage of radio waves thereinto |
| 11/21/1989 | US4882561 Electric noise absorber |
| 10/25/1989 | EP0338125A1 Method and apparatus for nulling local oscillator feedthrough |
| 10/24/1989 | US4875457 Apparatus and method for protecting engine electronics from radio frequency interference |
| 10/12/1989 | DE3811079A1 Electric circuit |
| 09/05/1989 | US4864643 Radio transmission system providing adjacent channel and image frequency rejection |
| 08/10/1989 | WO1989007373A1 Electronic appliance |
| 08/09/1989 | EP0326643A2 Method for operating a clock-operated device, and clock-operated device |
| 08/08/1989 | US4856023 System for maintaining low bit error rate in a starcoupled network of direct coupled stations |
| 07/27/1989 | WO1989006875A1 Radio frequency suppression for fuel pump |
| 07/11/1989 | US4846724 Shielded cable assembly comprising means capable of effectively reducing undesirable radiation of a signal transmitted through the assembly |
| 07/11/1989 | CA1257416A1 Wireless pbx/lan system with optimum combining |
| 07/04/1989 | US4845393 Radio frequency suppression for fuel pump |
| 06/27/1989 | US4843637 Tuner circuit |
| 05/23/1989 | US4833585 Zone filter |
| 05/11/1989 | DE3736971A1 Circuit arrangement for reducing radio-frequency interference signals |
| 05/02/1989 | US4827515 Digital demodulator |
| 04/25/1989 | US4825185 Electric noise absorber |
| 04/06/1989 | WO1989003141A1 Improved noise suppression system |
| 04/05/1989 | EP0310325A2 Control device in transceiver |
| 04/05/1989 | EP0309451A1 Device to protect against interference signals. |
| 03/29/1989 | EP0308520A1 Digital-Demodulator |
| 03/23/1989 | DE3735554A1 Radio interference suppression device for overhead-line suspension insulator strings |
| 03/21/1989 | US4815142 Noise reduction device in an electroacoustic system |
| 03/21/1989 | US4814694 System for detecting and processing abnormality in electromagnetic shielding of intelligent buildings |
| 03/21/1989 | CA1251586A1 Ensemble modem structure for imperfect transmission media |
| 03/07/1989 | US4811425 Apparatus for reducing the effects of local oscillator leakage in mixers employed in zero IF receivers |
| 03/07/1989 | US4811404 For attenuating the background noise |
| 03/07/1989 | US4810961 Radio wave leakage diagnosing system for intelligent building |
| 02/28/1989 | US4809274 System for processing audio signals |
| 02/16/1989 | DE3725981A1 Circuit at the connection of an electrical apparatus in order to improve the incident-radiation immunity |
| 02/07/1989 | US4803738 Radio communications system with reduced D/U ratio variations |
| 01/31/1989 | CA1249644A1 Method and apparatus for maximising efficiency in satellite communications |
| 01/12/1989 | DE3813609A1 Isolating element (interrupting element) for protective earthing |
| 01/11/1989 | EP0298161A1 Building with electromagnetic shield structure for individual floors |
| 12/06/1988 | CA1246174A1 Digital transmission system |
| 11/23/1988 | EP0291597A1 Method of electromagnetically shielding a building |
| 11/17/1988 | DE3717713C1 Radio interference suppression filter unit |
| 09/07/1988 | CN88101520A Omnidirectional self-adapting array signal processor |
| 08/16/1988 | US4764684 Static converter comprising a protective filter against high-frequency disturbanes |
| 08/11/1988 | DE3801188A1 Elektrischer rauschabsorber Electrical noise absorber |
| 08/03/1988 | EP0276277A1 Data communications system having noise reduction means. |
| 07/26/1988 | US4760357 Noise filter with inlet socket |
| 07/26/1988 | US4760355 In a data processing system |
| 07/20/1988 | CN87107636A Static transducer containing filter against high-frequency interference |
| 07/12/1988 | US4757282 Line filter |
| 05/31/1988 | US4748534 Device for establishing between conductors a galvanic connection, which is blocked for the transmission of electromagnetic radiation |
| 05/11/1988 | EP0267129A1 Static converter with a protection filter against high-frequency disturbances |
| 05/05/1988 | WO1988003306A1 Apparatus for eliminating noise and/or hum in a signal |
| 04/28/1988 | DE3635355A1 Radio-frequency interference protection |
| 04/12/1988 | CA1235176A1 Electromagnetic interference suppression for electrical discharge printers |
| 03/22/1988 | US4733193 Arrangement for eliminating signal hum |
| 03/15/1988 | US4731816 Ensemble modem structure for imperfect transmission media |
| 03/02/1988 | EP0257179A1 Electric noise absorber |
| 02/09/1988 | US4724441 Transmit/receive module for phased array antenna system |
| 02/04/1988 | DE3625368A1 Interference suppression filter for circuits in the electrical system of a motor vehicle |
| 01/28/1988 | WO1988000779A1 Data communications system having noise reduction means |
| 01/12/1988 | US4719433 Attenuation bead for the suppression of interference radiation |
| 01/05/1988 | US4717989 Heat sink, EMI shield and controller module assembly for a portable radio transceiver |
| 12/29/1987 | US4716373 Method and circuit arrangement for increasing the signal-to-noise ratio of a periodical electrical signal |
| 12/17/1987 | WO1987007792A1 Device to protect against interference signals |
| 12/09/1987 | EP0248713A1 Background noise reduction device in an electroacoustic line-up |
| 12/02/1987 | EP0247554A2 Special balancing wire to eliminate potential differences and to make signals linear |
| 11/25/1987 | EP0246640A2 Transmit/receive module for phased array antenna system |
| 11/04/1987 | EP0243403A1 Rfi suppression technique for switching circuits. |
| 10/15/1987 | DE3617798A1 Special compensation line for eliminating potential differences and for linearising signals |
| 09/16/1987 | EP0236956A2 Digital-compensation circuit of a known interfering signal |
| 09/16/1987 | EP0236759A2 Radio communications system with reduced interference |
| 09/15/1987 | US4694237 Isolated power supply system and method |
| 09/02/1987 | EP0234103A2 Tuner circuit |
| 08/26/1987 | EP0233669A1 Arrangement for galvanically interconnecting one or more electric conductors, while preventing electromagnetic radiation from transferring energy between conductors thus interconnected |
| 07/22/1987 | CN86207134U Synchronous frequency retransmission unit for television set |
| 07/16/1987 | DE3637121A1 Electrical engineering measures for the attenuation and suppression of radio-frequency signals on electrical lines |
| 07/07/1987 | US4679227 Ensemble modem structure for imperfect transmission media |
| 06/23/1987 | US4675629 Noise filter |
| 06/04/1987 | DE3542400A1 Arrangement for radio suppression of electrically operated drive motors, especially in domestic apparatuses |
| 05/27/1987 | DE3536976A1 Suppression of interference in vehicle audio systems |
| 05/14/1987 | DE3538949A1 Entstoerschaltung Suppression circuit |
| 05/12/1987 | US4665499 Averaging method for periodic strays elimination and a counting circuit for evoked responses measuring set-up for applying the method |
| 05/07/1987 | WO1987002840A1 Interference suppression circuit |
| 04/28/1987 | US4662001 Tunable notch filter for image frequency and conducted local oscillator leakage rejection |
| 04/23/1987 | WO1987002532A1 Rfi suppression technique for switching circuits |
| 02/19/1987 | DE3528574A1 Electric interference suppression filter |
| 02/10/1987 | US4642589 Feed through filter having an insulated bush for mounting filter in a bulkhead |
| 02/03/1987 | US4641317 Spread spectrum radio transmission system |
| 01/27/1987 | US4639914 Wireless PBX/LAN system with optimum combining |
| 01/21/1987 | EP0209182A2 Radio transmission system |
| 01/20/1987 | CA1216913A1 Echo canceller using end delay measurement |
| 01/13/1987 | US4636918 Decoupled integrated circuit package |
| 01/02/1987 | DE3521899A1 Interference suppression filter and method for its manufacture |
| 12/23/1986 | US4631640 Portable radio device for protecting a radio circuit from static electricity |
| 12/09/1986 | US4628325 Electromagnetic interference suppresion for electrical discharge printers |
| 12/04/1986 | WO1986007223A1 Ensemble modem structure for imperfect transmission media |
| 12/03/1986 | EP0203142A1 An arrangement for eliminating signal hum |
| 11/26/1986 | CN86103406A Ensemble modem structure for imperfect transmission media |
| 11/25/1986 | US4625270 RFI suppression technique for switching circuits |