| Patents for H04B 1 - Details of transmission systems, not covered by a single one of groups; Details of transmission systems not characterised by the medium used for transmission (188,568) |
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| 01/01/1991 | US4982341 Method and device for the detection of vocal signals |
| 12/31/1990 | WO1991000656A1 Frequency-jumping data transmission on a meteorite channel |
| 12/31/1990 | WO1991000653A1 Linear transmitter |
| 12/31/1990 | CA2035433A1 Method for the transmission of data using frequency hopping on a radio channel having a low availability rate and corresponding receiving device |
| 12/29/1990 | CA2019266A1 Burst mode transmitter/receiver unit |
| 12/28/1990 | CA2018854A1 Transmitter and/or receiver unit |
| 12/27/1990 | WO1991000655A1 Receiver with variable predetection bandwidth based on expected data rate |
| 12/27/1990 | WO1990016134A1 Paging system with energy efficient station location |
| 12/27/1990 | WO1990016033A1 Hand-held data capture system with interchangeable modules |
| 12/27/1990 | EP0404225A2 Radio receiver |
| 12/27/1990 | EP0404150A2 Circuit arrangement for matching the resonant frequency of an antenna resonant circuit to the output frequency of a transmitter output stage |
| 12/27/1990 | EP0404149A2 Antenna resonant circuit |
| 12/27/1990 | EP0404148A1 Method of transmitting messages with predetermined message duration from batteryless transponders to interrogation devices |
| 12/27/1990 | EP0403724A1 Automotive audio apparatus |
| 12/27/1990 | EP0403492A1 Bandswitching a two-way radio having a pll. |
| 12/27/1990 | EP0239639B1 Rapid frequency-hopping time synchronization |
| 12/27/1990 | EP0115507B1 General purpose data control system |
| 12/27/1990 | CA2050892A1 Receiver with variable predetection bandwidth based on expected data rate |
| 12/26/1990 | CN1048132A Remote control receiving for home electric applicance and receiving method thereof |
| 12/26/1990 | CN1011018B Extrema coding digitizing signal processing method and apparatus |
| 12/25/1990 | US4980925 Monopulse first detector array |
| 12/25/1990 | US4980898 Self-oscillating burst mode transmitter with integral number of periods |
| 12/25/1990 | US4980885 Power consumption reducing device for cyclic operating equipment such as a time-division switcher |
| 12/25/1990 | US4980767 Technique for determining signal dispersion characteristics in communications systems |
| 12/25/1990 | US4980687 Digital demodulator |
| 12/25/1990 | US4980660 Antenna sharing apparatus for switchable transmit/receive filters |
| 12/20/1990 | DE3447548C1 Radio transmission method for tactical use - using frequency pumps to transmit information in bursts and returning synthesisers |
| 12/19/1990 | EP0403247A2 AGC device for producing a gain controlled and d.c. offset removed signal |
| 12/19/1990 | EP0402992A1 Transmission system for transmitting a video signal with an identification signal, transmitter for generating the video signal, and picture display device for receiving and displaying the video signal |
| 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 | EP0402620A2 Wireless transmitting-receiving apparatus for a bicycle |
| 12/19/1990 | EP0247088B1 Portable radio battery pack with on-off switch |
| 12/19/1990 | CA2019073A1 Radio receiver |
| 12/18/1990 | USRE33497 Portable tape player with radio in lid |
| 12/18/1990 | US4979233 High frequency broad-band mixing circuit including an electrolytic capacitor in parallel with a local oscillator input port |
| 12/18/1990 | US4979232 Self-biasing solid-state T/R switch |
| 12/18/1990 | US4979231 Two-way radio for use in a communication system |
| 12/18/1990 | US4979230 Up-conversion homodyne receiver for cable television converter with frequency offset to avoid adjacent channel interference |
| 12/18/1990 | US4979188 Spectrally efficient method for communicating an information signal |
| 12/18/1990 | US4979186 Time domain radio transmission system |
| 12/18/1990 | US4979183 Transceiver employing direct sequence spread spectrum techniques |
| 12/18/1990 | US4979170 Alternating sequential half duplex communication system |
| 12/18/1990 | US4979047 Automatically activated commercial message timer |
| 12/18/1990 | CA1278043C Fm communication device with avoidance of interference by substantially same channel fm signal |
| 12/17/1990 | WO1990016120A1 System with compact spectrum |
| 12/13/1990 | WO1990015486A1 Receiver with improved intermodulation performance |
| 12/12/1990 | EP0402273A1 Synthesizer receiver |
| 12/12/1990 | EP0402044A2 Optical receivers |
| 12/12/1990 | EP0401932A1 Receiver for terrestrial AM and satellite FM-TV broadcasting signals |
| 12/12/1990 | EP0401930A2 An interface for a TV-VCR system |
| 12/12/1990 | EP0401850A2 System and method of frequency calibration in a linked compression-expansion (Lincompex) system |
| 12/12/1990 | EP0401545A1 Power control arrangement |
| 12/12/1990 | EP0401244A1 Radio receiver for vehicles |
| 12/12/1990 | CN2067468U Aural retransmission receiver for tv |
| 12/11/1990 | US4977614 Wristband with loop antenna |
| 12/11/1990 | US4977613 Fine tuning frequency synthesizer with feedback loop for frequency control systems |
| 12/11/1990 | US4977611 Portable radio apparatus having battery saved channel scanning function |
| 12/11/1990 | US4977608 Radio communication system |
| 12/11/1990 | US4977597 Stereo receiver circuit |
| 12/11/1990 | US4977578 Spread spectrum communication system |
| 12/11/1990 | US4977577 Spread spectrum transmitter |
| 12/11/1990 | US4977340 Device for protecting an electrical circuit against interference pulses |
| 12/11/1990 | CA1277790C Mobile communications system capable of avoiding interference with control channel |
| 12/11/1990 | CA1277729C Multiple resonator component - mountable filter |
| 12/11/1990 | CA1277713C2 Portable radio transceiver housing structurally supported by a battery |
| 12/09/1990 | CA2018174A1 System and method of frequency calibration in a linked compression-expansion (lincompex) system |
| 12/08/1990 | CA2020357A1 Hand-held data capture system with interchangeable modules |
| 12/06/1990 | DE3918257A1 Matching and filter circuit for transmitter and receiver aerial - has two inductively coupled, parallel resonance circuits, each with adjustable capacity and inductance |
| 12/05/1990 | EP0401019A2 Structure of a duplexer for radio equipment |
| 12/05/1990 | EP0400755A1 Digital transmission system using subband coding of a digital signal |
| 12/05/1990 | EP0400314A2 Spread spectrum communication system |
| 12/05/1990 | EP0400222A1 Digital transmission system using subband coding of a digital signal |
| 12/05/1990 | EP0400001A1 Multipath reduction system |
| 12/05/1990 | CN1047595A Apparatus for telecommunication |
| 12/05/1990 | CN1010734B Fm/fmx stereophonic receiver |
| 12/05/1990 | CN1010732B Digital radio frequency receiver |
| 12/04/1990 | US4975953 Combined deemphasis circuit and noise blanker |
| 12/04/1990 | US4975926 Wireless indoor data communication system |
| 12/04/1990 | US4975801 Automatic by-pass for television components |
| 12/04/1990 | US4975775 Tuner for receiving television signal in frequency division multiplex system and television signal in time division multiplex system |
| 12/04/1990 | US4975681 Interfering signal rejection circuitry and electronic article surveillance system and method employing same |
| 12/04/1990 | US4975658 High frequency amplifier circuit with noise figure improvement |
| 12/04/1990 | CA1277417C Transponder antenna |
| 12/04/1990 | CA1277373C Tweet elimination, or reduction, in superheterodyne receivers |
| 12/02/1990 | WO1990015479A1 Acoustically coupled antenna |
| 12/02/1990 | CA2475414A1 Decoder, receiver and method for decoding an encoded digital audio signal |
| 12/02/1990 | CA2056367A1 Acoustically coupled antenna |
| 11/30/1990 | CA2014323A1 Spread spectrum communication system |
| 11/29/1990 | WO1990014721A1 Portable personal reception and display device for information transmitted via radio, combined with a watch |
| 11/29/1990 | WO1990014719A1 Process for transmitting a signal |
| 11/29/1990 | WO1990014718A1 Method and apparatus for reducing intermodulation distortion |
| 11/29/1990 | WO1990014626A1 Systems with data-token/one-wire-bus |
| 11/29/1990 | WO1990010200A3 Identification system using hertzian waves, consisting of an interrogation station and a responder unit |
| 11/29/1990 | DE3917317A1 Portable radio telephone with handle on housing - has handle releasably secured, with groove at one end engaging axis on housing |
| 11/28/1990 | EP0399557A2 FM stereo receiver |
| 11/28/1990 | EP0399534A2 Fm stereophonic receiver |
| 11/28/1990 | EP0399355A2 Broadcast receiver |
| 11/28/1990 | EP0399200A2 Functionally modifiable cable television converter system |
| 11/28/1990 | EP0399176A2 Construction of a telephone handset operating as an independent unit |
| 11/28/1990 | EP0398973A1 Method and apparatus for electrical signal coding. |