| 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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| 08/06/1991 | US5038405 Tunable antenna apparatus and method for use with superheterodyne receivers |
| 08/06/1991 | US5038400 Carry holder for an electronic device |
| 08/06/1991 | US5038399 Method for assigning channel reuse levels in a multi-level cellular system |
| 08/06/1991 | US5038363 Correlation processing device using a surface acoustic wave convolver |
| 08/06/1991 | US5038362 Spread spectrum receiver |
| 08/06/1991 | US5038253 Transceiver mounting assembly having integrally formed lock |
| 08/06/1991 | US5038113 Nonlinearity generator using FET source-to-drain conductive path |
| 08/06/1991 | CA1287376C Processor based linked compressor-expander telecommunications system |
| 08/06/1991 | CA1287373C Infrared stereo speaker system |
| 07/31/1991 | EP0439435A2 Control loop for reducing the time of response of a tuner-AGC of a superheterodyne receiver and relative leading edge differentiating circuit used in the control loop |
| 07/31/1991 | EP0439326A2 Digitally frequency-locking a radio transceiver to the received signal |
| 07/31/1991 | EP0439319A1 Automobile radio telephone apparatus capable of detecting a drop of power source voltage |
| 07/31/1991 | EP0438934A2 Distribution system for very high frequency signals |
| 07/31/1991 | CN1013423B Full-compatibility railway dispatching system device with radio |
| 07/30/1991 | US5036523 Automatic frequency control of satellite transmitted spread spectrum signals |
| 07/30/1991 | US5036432 Plastic shell structure for radio telephone |
| 07/30/1991 | US5036302 Radio receiver filter with image rejection |
| 07/30/1991 | CA1287115C Fm/fmx stereophonic receiver |
| 07/30/1991 | CA1287098C Line protection switch equipment |
| 07/25/1991 | WO1991011066A1 Circuitry for interfacing telecommunications equipment to a communication channel |
| 07/25/1991 | WO1991011065A1 Method of and apparatus for controlling modulation of digital signals in frequency-modulated transmissions |
| 07/25/1991 | WO1991011058A1 Method and apparatus for providing maximum rate modulation or compression encoding and decoding |
| 07/25/1991 | WO1991011037A1 Real time signal separation method and device |
| 07/25/1991 | DE4001266A1 FSK digital data transmission over power supply networks - involves synchronised read-out of frequencies stored in microcontroller's memory with no time lag between sample values |
| 07/25/1991 | DE4001265A1 FSK digital data reception over power supply network - synchronising switching of signal with max. possible mean level to VCO clocked by control calculator |
| 07/25/1991 | CA2074169A1 Method of and apparatus for controlling modulation of digital signals in frequency modulated transmissions |
| 07/24/1991 | EP0438199A2 Radio receiver |
| 07/24/1991 | CN2081612U Multi-channel remote switch |
| 07/23/1991 | US5034996 Sound processing system and vehicle harness |
| 07/23/1991 | US5034995 Head supported portable radio assembly |
| 07/23/1991 | US5034994 Single balanced mixer with output filter |
| 07/23/1991 | US5034978 Universal channel unit switchable between two wire and four wire configurations |
| 07/23/1991 | US5034963 Apparatus for visually aiding MSK detection and interference recognition and classification |
| 07/23/1991 | US5034753 Acoustically coupled antenna |
| 07/23/1991 | US5034720 Current control apparatus for insertion into battery powered devices |
| 07/23/1991 | US5034697 Magnetic amplifier switch for automatic tuning of VLF transmitting antenna |
| 07/23/1991 | US5034002 Auto-non-reusable syringe-needle system for injections for a unique use |
| 07/23/1991 | CA1286726C Mobile telephone terminal having function to perform call clear process |
| 07/17/1991 | EP0437198A1 Optical communication system having an improved protection line switching mechanism |
| 07/17/1991 | EP0437190A2 Polarization converter application for accessing linearly polarized satellites with single- or dual-circularly polarized earth station antennas |
| 07/17/1991 | EP0436542A1 Fm receptor unit. |
| 07/17/1991 | CN2081176U Fm am mini-radio set |
| 07/17/1991 | CN1053161A Remote control power supply apparatus |
| 07/17/1991 | CN1053159A Circuit for preventing interference of tv channel 6 broadcast |
| 07/17/1991 | CN1053156A Reduction technique for signal transmission freq. bands |
| 07/16/1991 | US5033111 Radio telecommunication apparatus |
| 07/16/1991 | US5033109 Pocket transceiver |
| 07/11/1991 | WO1991010308A1 Automatic data restoral for modems |
| 07/11/1991 | DE4000090A1 Increasing signal=to=noise ratio of noisy input signals - using signal generator driven by external signal in conjunction with filters and multiplied to select desired signal |
| 07/10/1991 | EP0436515A2 Remotely controlled power supply apparatus |
| 07/10/1991 | EP0435964A1 Energy saving protocol for a communication system |
| 07/10/1991 | EP0409880A4 Actuator and communication system |
| 07/10/1991 | CN2080731U Multifunction digital microwave channel unit |
| 07/10/1991 | CN2080730U Amorphous silicon solar cell radio |
| 07/09/1991 | US5031233 Single chip radio receiver with one off-chip filter |
| 07/09/1991 | US5031231 Mobile telephone station with power saving circuit |
| 07/09/1991 | US5031230 Frequency, phase and modulation control system which is especially useful in simulcast transmission systems |
| 07/09/1991 | US5031191 Spread spectrum signal demodulation circuit |
| 07/09/1991 | US5031173 Decoder for added asynchronous bit sequences |
| 07/09/1991 | US5030963 Signal receiver |
| 07/09/1991 | US5030858 Prevention against noise of digital audio circuit |
| 07/09/1991 | CA1286041C Tdma communication system having common time slots for system maintenance |
| 07/09/1991 | CA1285996C Maximum likelihood diversity receiver |
| 07/09/1991 | CA1285993C Radio telephone apparatus |
| 07/09/1991 | CA1285992C Method and apparatus for automatically adjusting the output power of a transmitter |
| 07/04/1991 | DE4029716A1 Voice operated remote control system - evaluates priority of speech command in conjunction with accuracy of matching |
| 07/04/1991 | DE4029702A1 Command decoding in voice control system - using decoder to receive speech commands and assemblying command data for transmission |
| 07/03/1991 | EP0435607A2 Transponder |
| 07/03/1991 | EP0435593A2 Transmitted code clock code-matching synchronization for spread-spectrum communication systems |
| 07/03/1991 | EP0435455A2 Varying bandwidth digital signal detector |
| 07/03/1991 | EP0435370A2 Remote control television system using supplementary unit for simplified personalized control |
| 07/03/1991 | EP0435018A2 Radio receiver |
| 07/03/1991 | EP0434950A2 Simulation of a complex impedance and interface for same |
| 07/03/1991 | EP0434921A2 Radio with error logging function |
| 07/03/1991 | EP0434817A1 Proximity detecting apparatus. |
| 07/02/1991 | US5029298 Transmitter circuit |
| 07/02/1991 | US5029239 Radio equipped umbrella |
| 07/02/1991 | US5029238 Noise suppression circuit |
| 07/02/1991 | US5029237 Radio receiver frequency control system |
| 07/02/1991 | US5029236 Radiotelephone apparatus |
| 07/02/1991 | US5029182 Automatic gain control (AGC) for frequency hopping receiver |
| 07/02/1991 | US5029181 Automatic calibration device for direct spectrum spread receiver |
| 07/02/1991 | US5029180 Integrated |
| 07/02/1991 | US5029158 Protection switching in a multi-channel communications system |
| 07/02/1991 | US5028883 Tone controller for attenuating noise in the signal generated by receiver from weak electric field, and receiver having the tone controller |
| 07/02/1991 | US5027687 Basic audio signal |
| 06/27/1991 | WO1991009471A1 Portable radio receivers |
| 06/27/1991 | DE3942758A1 Complex impedance two-to-four wire interface circuit - uses amplified with complex impedance feedback and series resistors to measure current and phase |
| 06/26/1991 | EP0434651A1 A method of effecting channel estimation for a fading channel when transmitting symbol sequences |
| 06/26/1991 | EP0434374A2 Low noise dual polarization electro-magnetic power reception and conversion system |
| 06/26/1991 | EP0434294A2 A power control method for a voltage controlled power amplifier and circuitry used in the method |
| 06/26/1991 | EP0433308A1 Two-way radio communications system having selectable operating modes. |
| 06/26/1991 | EP0433297A1 Television receiver |
| 06/26/1991 | CN2079836U Intercom with radio |
| 06/25/1991 | US5027429 Frequency modulator utilizing frequency synthesizer |
| 06/25/1991 | US5027428 Power saving arrangement and power saving method |
| 06/25/1991 | US5027402 Blend-on-noise stereo decoder |
| 06/25/1991 | US5027107 Frequency sensor |
| 06/25/1991 | US5025921 Environmental radio guard |
| 06/23/1991 | WO1991010296A1 A method of effecting channel estimation for a fading channel when transmitting symbol sequences |