| 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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| 11/03/1987 | US4704738 Transistor amplifier and mixer input stage for a radio receiver |
| 11/03/1987 | US4704736 Method and apparatus for reducing interference in broadcast receiver |
| 11/03/1987 | CA1228912A1 Surface acoustic wave passive transponder having amplitude and phase-modifying surface pads |
| 11/03/1987 | CA1228911A1 Surface acoustic wave passive transponder having acoustic reflectors |
| 10/29/1987 | DE3701321A1 Electronic contact communicating device between people |
| 10/28/1987 | EP0243063A2 Angle modulator |
| 10/28/1987 | EP0242444A2 Mobile radio receiver |
| 10/27/1987 | US4703520 Radio transceiver having an adaptive reference oscillator |
| 10/27/1987 | US4703501 Sound multiplex receiver |
| 10/27/1987 | US4703480 Digital audio transmission |
| 10/27/1987 | US4703359 Universal remote control unit with model identification capability |
| 10/27/1987 | EP0209527A4 Method of communications between register-modelled radio devices. |
| 10/22/1987 | WO1987006416A1 Device for the remote control of a videorecorder or a videoreceiver |
| 10/22/1987 | DE3611959A1 Synchronisation method |
| 10/21/1987 | CN87100774A Circuit for switching between balanced networks |
| 10/20/1987 | US4701724 Injection switch and directional coupler |
| 10/20/1987 | US4701722 Circuit arrangements for modifying dynamic range using series and parallel circuit techniques |
| 10/20/1987 | US4701715 Preceding value holding gate circuit for eliminating pulsive noises |
| 10/20/1987 | CA1228436A1 Code division multiplexer using direct sequence spread spectrum signal processing |
| 10/14/1987 | EP0241265A1 Radio transceiver including and antenna switching circuit capable of changing reception sensitivity |
| 10/14/1987 | EP0241122A2 Data transmission using a transparent tone-in band system |
| 10/14/1987 | EP0241011A1 Device for switching through colour video signals |
| 10/14/1987 | EP0240577A1 Interface unit between a redundant dual bus and a data-processing unit |
| 10/14/1987 | EP0139803B1 Method of recovering lost information in a digital speech transmission system, and transmission system using said method |
| 10/13/1987 | US4700362 A-D encoder and D-A decoder system |
| 10/13/1987 | US4700361 Spectral emphasis and de-emphasis |
| 10/13/1987 | US4700360 An analog waveform |
| 10/13/1987 | US4700348 Hot standby communications system |
| 10/13/1987 | US4700151 Modulation system capable of improving a transmission system |
| 10/13/1987 | CA1228124A1 Interference wave detection circuit for use in radio receiver |
| 10/13/1987 | CA1228123A1 Radio receiver with field intensity detector |
| 10/08/1987 | WO1987006083A1 Tdm communication system for efficient spectrum utilization |
| 10/08/1987 | WO1987006082A1 Method and apparatus for controlling a tdm communication device |
| 10/08/1987 | WO1987006072A1 Fm receiver with noise suppression during rayleigh faded received signals |
| 10/07/1987 | EP0239639A1 Rapid frequency-hopping time synchronization. |
| 10/06/1987 | US4698597 Suppressed-fundamental frequency three-way predistorter |
| 09/30/1987 | EP0239467A1 Transmission power control apparatus in a radio communication transmitter-receiver station |
| 09/30/1987 | EP0239393A2 Intermittently driven transmitter |
| 09/30/1987 | EP0239249A2 RF-AM transmitter with pulse-width modulator |
| 09/30/1987 | EP0239209A1 A power unit for a battery-driven toy |
| 09/30/1987 | EP0238880A2 Mobile station and a mobile radio communication network in which electric power is saved without reduction of an activity ratio of radio communication channels |
| 09/30/1987 | CN86200233U Class d power carrier transmitter |
| 09/29/1987 | US4697209 Methods and apparatus for automatically identifying programs viewed or recorded |
| 09/29/1987 | CA1227573A1 Adaptive speech detector system |
| 09/29/1987 | CA1227541A1 Method of and apparatus for determining time origin of timer for modem |
| 09/29/1987 | CA1227540A1 Method of transmitting terminating call signals within a restricted duration and a base station and a portable unit for use in the same |
| 09/23/1987 | EP0237958A1 Device at the receiver side with an operation mode controlled from the transmitter side |
| 09/22/1987 | US4696060 Optical transmission systems |
| 09/22/1987 | US4696055 RF tuning circuit which provides image frequency rejection |
| 09/22/1987 | US4696054 Pocketable wireless transmitter and receiver |
| 09/16/1987 | EP0236956A2 Digital-compensation circuit of a known interfering signal |
| 09/16/1987 | EP0236946A2 Mobile receiver unit having function for providing information of electric field intensity |
| 09/16/1987 | EP0236558A1 Method for the transmission of digital data |
| 09/16/1987 | EP0236445A1 Capacity expander for telephone line |
| 09/16/1987 | CN86200244U High disturbance-resistant digital integrated circuit carrier receiver |
| 09/15/1987 | US4694500 Control voltage generating circuit for activating a noise reduction circuit in an FM stereo receiver |
| 09/15/1987 | US4694467 Modem for use in multipath communication systems |
| 09/15/1987 | US4694336 Digital data transmission method |
| 09/15/1987 | CA1226946A1 Low bit-rate pattern coding with recursive orthogonal decision of parameters |
| 09/15/1987 | CA1226914A1 Modem for pseudo noise communication on a.c. lines |
| 09/10/1987 | DE3607762A1 Automatic remote control device |
| 09/09/1987 | EP0236076A2 Circuits for altering the dynamic range of audio signals |
| 09/09/1987 | EP0236068A2 AM-RF Transmitter with compensation for power supply variations |
| 09/09/1987 | EP0235869A1 Communication system |
| 09/09/1987 | EP0235756A2 Owner identification circuit for an electrical apparatus, particularly for car radios |
| 09/09/1987 | EP0235264A1 Digital radio frequency receiver |
| 09/09/1987 | EP0235257A1 Multiplexed digital packet telephone communication method. |
| 09/08/1987 | CA1226627A1 Mixer arrangement comprising first and second quadrature mixer stages |
| 09/08/1987 | CA1226529A1 Receiver suspension and acoustic porting system |
| 09/02/1987 | EP0234936A2 AM radio transmitter |
| 09/02/1987 | EP0234810A1 Audio apparatus |
| 09/02/1987 | EP0234103A2 Tuner circuit |
| 09/01/1987 | US4691383 Compact radio |
| 09/01/1987 | US4691382 Battery saving signal generating circuit |
| 09/01/1987 | US4691378 Tuner for television receiver |
| 09/01/1987 | US4691377 Automatic frequency and gain control circuit |
| 09/01/1987 | US4691375 Data transmission using a transparent tone-in band system |
| 09/01/1987 | US4691361 Speaker changeover device |
| 09/01/1987 | US4691357 Stereophonic receiving circuit providing improved switching characteristics between stereophonic and monaural modes |
| 09/01/1987 | US4691356 AM/FM synchronizing circuit |
| 09/01/1987 | US4691326 Spread-spectrum communication system |
| 09/01/1987 | US4691313 Wireless talking apparatus |
| 09/01/1987 | US4691202 Identification systems |
| 09/01/1987 | US4690780 Fluids, solids, free-flowing, dielectrics, viscosity |
| 09/01/1987 | CA1226364A1 Klystron tuning control system |
| 09/01/1987 | CA1226335A1 Squelch circuit |
| 08/27/1987 | WO1987004900A1 Syringe-implantable identification transponder |
| 08/26/1987 | CN86101090A Amplitude modulation apparatus with floating carrier |
| 08/25/1987 | US4689825 Receiver stage for radio or television receiver |
| 08/25/1987 | US4689820 Hearing aid responsive to signals inside and outside of the audio frequency range |
| 08/25/1987 | US4689790 Method and apparatus for remote signalling on a digital transmission link |
| 08/25/1987 | US4689506 Control circuit for use with electronic attenuators and method for providing a control signal proportional to absolute temperature |
| 08/25/1987 | US4689498 Signal input circuit with constant operating power |
| 08/25/1987 | CA1226048A1 Noise subtraction filter |
| 08/20/1987 | DE3604292A1 Device for voice-controlled transmission of audio signals via radio |
| 08/18/1987 | US4688266 Car data transmission device for optical fibers |
| 08/18/1987 | US4688264 AM/FM receiver with automatic tuning system |
| 08/18/1987 | US4688262 Externally connectable control unit for a portable radio |
| 08/18/1987 | US4688261 Frequency synthesized multichannel radio apparatus |
| 08/18/1987 | US4688256 Speech detector capable of avoiding an interruption by monitoring a variation of a spectrum of an input signal |