| 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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| 01/04/1994 | US5276704 SAWC phase detection method and apparatus |
| 01/04/1994 | US5276562 Emphasis apparatus disposed in either a record or playback system having triple weight coefficient generating devices |
| 01/04/1994 | US5276403 Nonlinear preemphasis-deemphasis system |
| 01/04/1994 | CA2008594C Transmitter using gallium arsenide fet with means for controlling gate bias voltage of the fet for suppressing undesired signal at a start condition of the transmitter |
| 12/30/1993 | CA2099302A1 Method and apparatus for sample-data receiver squelch |
| 12/29/1993 | EP0576382A1 Transmission procedure of electrical signals on a radio-channel and transmission systems for the implementation of the procedure |
| 12/29/1993 | EP0576084A1 FM-receiver with dynamic intermediate frequency (IF) filter tuning |
| 12/29/1993 | EP0576082A1 FM receiver including a phase quadrature IF filter |
| 12/29/1993 | EP0576078A1 FM receiver |
| 12/29/1993 | EP0576060A1 Optical mixing device having one photodetector for a heterodyne receiver |
| 12/29/1993 | EP0576012A2 Digital broadcast receiver |
| 12/29/1993 | EP0575753A2 Electronic monitoring system |
| 12/29/1993 | EP0575713A1 A phase lock loop |
| 12/29/1993 | EP0575513A1 Electronic billboard and vehicle traffic control communication system |
| 12/29/1993 | CN2151585Y Remote group controlling carrier signals collector |
| 12/29/1993 | CN1080059A A pseudorandom noise ranging receiver which compensates for multipath distortion by dynamically adjusting the time delay spacing between early and late correctors |
| 12/28/1993 | US5274844 Beam pattern equalization method for an adaptive array |
| 12/28/1993 | US5274843 Paging apparatus having a battery saving function |
| 12/28/1993 | US5274697 Automatic data restoral for modems |
| 12/28/1993 | US5274667 Adaptive data rate packet communications system |
| 12/28/1993 | US5274666 Wireless communication system |
| 12/28/1993 | US5274665 Polyopoly overlapping spread spectrum communication system and method |
| 12/28/1993 | US5274613 Wristwatch radiotelephone |
| 12/28/1993 | US5274454 Programming interface for electronic devices |
| 12/28/1993 | US5274343 Plural switch circuits having RF propagation networks and RF terminations |
| 12/28/1993 | US5274318 Portable wireless communication unit and method of using same |
| 12/27/1993 | CA2099215A1 Excitation stage of a transmission tube for short-wave transmitter |
| 12/23/1993 | WO1993026112A1 Apparatus for accepting and retaining an information card |
| 12/23/1993 | WO1993026099A1 Method of detecting errors in digitized data-reduced audio and data signals |
| 12/23/1993 | WO1993026098A1 Ground radio transmitting and receiving apparatus |
| 12/23/1993 | WO1993026097A1 Radio transmitting and receiving apparatus |
| 12/23/1993 | WO1993026094A1 Receiver automatic gain control |
| 12/23/1993 | WO1993025987A1 Power saving remote keyless entry |
| 12/23/1993 | WO1993025955A1 Portable data processor which selectively activates and deactivates internal modular units and application processor to conserve power |
| 12/23/1993 | WO1993022164A3 Security systems |
| 12/23/1993 | DE4220296A1 Narrow-band interference suppression circuit esp. for car radio - employs PLL and shifter to generate compensation signal at frequency of interference component but with opposite phase |
| 12/23/1993 | CA2137831A1 Portable data processor which selectively activates and deactivates internal modular units and application processor to conserve power |
| 12/23/1993 | CA2137166A1 Ground radio transmitting and receiving apparatus |
| 12/22/1993 | EP0575214A1 Transformable electronic apparatus for wall- or rack-mounting |
| 12/22/1993 | EP0575203A1 Antenna switching circuit for a diversity receiver |
| 12/22/1993 | EP0575110A2 Compressing and expanding digital signals |
| 12/22/1993 | EP0574523A1 Variable bit rate speech encoder |
| 12/22/1993 | EP0574509A1 Signal processing apparatus |
| 12/22/1993 | EP0574382A1 Asymmetric spread spectrum correlator |
| 12/22/1993 | EP0357632B1 Arrangement for filtering an incoming fm-uhf signal |
| 12/22/1993 | EP0326566B1 Adaptive correction of dc error transients |
| 12/22/1993 | CN2149791Y Helmet type transceiver |
| 12/22/1993 | CN1023280C Digital transmission system using subband coding of digital signal |
| 12/21/1993 | US5272721 Spread spectrum receiving device |
| 12/21/1993 | US5272559 Truncated frequency discriminator |
| 12/21/1993 | US5272525 System for local wireless transmission of signals at frequencies above 900 MHz |
| 12/21/1993 | US5272451 Clock reproducing circuit for eliminating an unnecessary spectrum |
| 12/21/1993 | CA2022278C Single-block filter for antenna duplexing and antenna-summed diversity |
| 12/20/1993 | CA2071931A1 Cell switch |
| 12/16/1993 | DE4318867A1 Audio equipment incorporating RDS receiver - includes muting circuit for suppression of noise emission during intervals of reception interference of mobile antenna |
| 12/16/1993 | DE4219400A1 Verfahren für die Fehlererkennung digitalisierter, datenreduzierter Ton- und Datensignale Method for error detection digitized, data-reduced audio and data signals |
| 12/15/1993 | EP0574288A1 Method and apparatus for transmission error concealment of frequency transform coded digital audio signals |
| 12/15/1993 | EP0574189A1 A booster |
| 12/15/1993 | EP0574117A1 Discriminating and suppressing incoming signal noise |
| 12/15/1993 | EP0574009A2 DGPS positioning method, DGPS reference station and DGPS positioning apparatus for moving object |
| 12/15/1993 | EP0573856A1 Radio transceiver |
| 12/15/1993 | EP0573597A1 Monolithic ceramic filter or duplexer having surface mount connections and transmission zeroes |
| 12/15/1993 | EP0573567A1 Hand-held data capture system with interchangeable modules and interactive control circuits |
| 12/15/1993 | EP0483246A4 Combined bias supply and power shut-off circuit |
| 12/15/1993 | EP0436542B1 Fm receptor unit |
| 12/15/1993 | CN2149728Y 2182 KHz pseudo-antenna |
| 12/15/1993 | CN2149727Y Multi-functionfrequency-jmodulation radio |
| 12/15/1993 | CN1023180C Quieting receiver during power interruption |
| 12/14/1993 | US5271063 Controls for a vehicle audio/video apparatus |
| 12/14/1993 | US5271060 Circuitry for interfacing telecommunications equipment to a communication channel |
| 12/14/1993 | US5271056 Electromagnetic interference shielding construction in a radio telephone |
| 12/14/1993 | US5271038 Distortion suppression using thresholding techniques |
| 12/14/1993 | US5271034 System and method for receiving and decoding global positioning satellite signals |
| 12/14/1993 | US5270719 Transmission/reception module for an electronically phase-controlled antenna |
| 12/14/1993 | US5270702 Battery door for a selective call receiver |
| 12/14/1993 | CA1325262C One-to-one line switching system |
| 12/09/1993 | WO1993025016A1 Dynamic loader |
| 12/09/1993 | WO1993025015A1 Process for reducing data in the transmission and/or storage of digital signals from several interdependent channels |
| 12/09/1993 | WO1993025010A1 Method and apparatus for communicating variable length messages between register modeled radio devices |
| 12/09/1993 | WO1993025009A1 Information and entertainment performance system |
| 12/09/1993 | WO1993025008A1 Radio accessory adapter |
| 12/08/1993 | EP0573103A1 Transmitter, receiver and record carrier in a digital transmission system |
| 12/08/1993 | EP0573097A1 Transmission of data by radio |
| 12/08/1993 | EP0572639A1 Distribution system for communication services |
| 12/08/1993 | EP0572379A1 A method for the contactless transmission of information. |
| 12/08/1993 | EP0341238B1 Automatic antenna tuning system for portable communication devices |
| 12/08/1993 | EP0334940B1 Method and apparatus for isolating faults in an antenna system |
| 12/08/1993 | EP0287671B1 Antenna sharing device |
| 12/08/1993 | CN2149065Y Protecting casing of remote control box for domestic appliances |
| 12/07/1993 | US5268938 Redundancy scheme for Fourier transform coding on peak limited channels |
| 12/07/1993 | US5268927 Digital adaptive transversal filter for spread spectrum receivers |
| 12/07/1993 | US5268926 Method and apparatus for the simultaneous transmission of separate data signals |
| 12/07/1993 | US5268819 Circuit board assembly |
| 12/07/1993 | US5268699 Data communication receiver utilizing a loop antenna having a hinged connection |
| 12/07/1993 | US5268689 Multi-band microwave detector |
| 12/07/1993 | CA2007141C Housing for a portable radio telephone device |
| 12/07/1993 | CA1325051C Syringe-implantable identification transponder |
| 12/07/1993 | CA1325045C Data communication system having means for switching between main and stand-by apparatuses |
| 12/02/1993 | DE4317385A1 Car stereo system with removable front panel - has radio transmitter in panel so driver can take panel away on leaving vehicle |
| 12/01/1993 | EP0572252A1 Wrist-carried radiotelephone |