| 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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| 05/07/1991 | US5014351 Method and apparatus for reducing alternator noise |
| 05/07/1991 | US5014349 Television tuner for common use in BS/UV |
| 05/07/1991 | US5014348 Self-programming scanning radio receiver |
| 05/07/1991 | US5014346 Rotatable contactless antenna coupler and antenna |
| 05/07/1991 | US5014343 Data communication system |
| 05/07/1991 | US5014261 System for switching from working units to stand-by units |
| 05/07/1991 | US5014168 Radio-light fixture |
| 05/07/1991 | US5014046 Display pager with supplemental display means |
| 05/07/1991 | US5014017 Power-saving low-frequency power amplifier |
| 05/02/1991 | EP0425267A2 Satellite receiver |
| 05/02/1991 | EP0425097A2 Frequency hopping receiver comprising amplifier with switchable time-constant |
| 05/02/1991 | EP0425034A1 Method of transmitting a digital video signal and a receiver for use in the method |
| 05/02/1991 | DE4034521A1 Vehicle-mounted traffic information system receiver - uses battery saving circuitry and memory to allow immediate retrieval of data |
| 05/01/1991 | CN2076283U Multichannel wireless remote control switch |
| 04/30/1991 | US5012490 Varying bandwidth digital signal detector |
| 04/30/1991 | US5012235 Paging receiver with continuously tunable antenna and RF amplifier |
| 04/30/1991 | US5012220 Solar powered paging device |
| 04/30/1991 | CA1283706C Portable radio communication apparatus having diversity receptionfunction |
| 04/25/1991 | DE4033839A1 Channel indicator for TV and radio receiver - has switching pattern, selecting receivable station and optically displaying on screen |
| 04/25/1991 | DE4000679C1 Regulating dynamic compressors and expanders - supplying max. and min. value signals from two branches to variable amplifier serving as adjuster |
| 04/24/1991 | EP0424162A2 Method of coding an audio signal by using an orthogonal transformation |
| 04/24/1991 | EP0424016A2 Perceptual coding of audio signals |
| 04/24/1991 | EP0424009A2 Automatic gain control circuit in a radio telephone receiver |
| 04/24/1991 | EP0423739A2 Remote control system for electronic apparatus |
| 04/24/1991 | EP0423715A2 Synchronization for entry to network in a frequency hopping communication system |
| 04/24/1991 | EP0423666A1 Digital non-linearity correction method for a transmission chain, and device for carrying out the method |
| 04/24/1991 | EP0423381A1 Apparatus for transmitting audio and/or digital information |
| 04/24/1991 | EP0138914B1 Fm stereophonic radio broadcasting system having s channel companding |
| 04/24/1991 | CN1050957A Zero passage signal homomorphic treating method and shortwave anti-fading receiving homomorphic treating method |
| 04/23/1991 | US5010557 Mobile radio transmitter using band expanding method |
| 04/23/1991 | US5010550 Transmission line switching system |
| 04/23/1991 | US5010400 Television tuner for receiving multiple band television signals |
| 04/23/1991 | CA1283457C Method and apparatus for controlling the frequency of operation and at least one further variable operating parameter of a radio communications device |
| 04/23/1991 | CA1283456C Radio with options board |
| 04/20/1991 | WO1991006164A1 Digital receiver for band-spread signals |
| 04/18/1991 | WO1991005436A1 Broadcast receiver |
| 04/18/1991 | WO1991005420A1 Automatic frequency control of satellite transmitted spread spectrum signals |
| 04/18/1991 | WO1991005415A1 Received signal strength indicator |
| 04/18/1991 | WO1991005412A1 Process for transmitting a signal |
| 04/18/1991 | WO1991005410A1 Method and apparatus for adjusting the frequency of a two-way radio |
| 04/18/1991 | WO1991005333A1 Error detection/correction scheme for vocoders |
| 04/18/1991 | WO1990011675A3 Mixed modulation level communication system |
| 04/18/1991 | WO1990010987A3 Energy saving protocol for a communication system |
| 04/18/1991 | DE4014394A1 Preventing faulty operation of audio changeover switch - uses decision step for testing stereo or mono mode of received signal |
| 04/17/1991 | WO1991006148A1 In-wire selective cancellation system |
| 04/17/1991 | EP0423050A1 Compression apparatus for transformed digital audio signal with adaptive quantization based on psycho-acoustic criterium |
| 04/17/1991 | EP0422467A2 HF high data rate modem |
| 04/16/1991 | US5008954 Voice-activated radio transceiver |
| 04/16/1991 | US5008939 AM noise reducing |
| 04/16/1991 | US5008925 Cellular telephone responsive to service availability for operating on different cellular telephone systems |
| 04/16/1991 | US5008900 Subscriber unit for wireless digital subscriber communication system |
| 04/16/1991 | US5008899 Receiver for spectrum spread communication |
| 04/16/1991 | US5008898 Carrier modulating device for a spread spectrum communication device |
| 04/16/1991 | US5008864 Portable radio telephone device |
| 04/16/1991 | US5008665 Measuring device having transmitter |
| 04/16/1991 | CA1283171C Pulse width modulator for am-rf transmitter |
| 04/13/1991 | WO1991006155A1 Code acquisition method and circuit for a spread spectrum signal receiver |
| 04/13/1991 | CA2042608A1 Code acquisition method and circuit for a spread spectrum signal receiver |
| 04/11/1991 | DE4004196C1 Transponder transferring stored measurement data to interrogator - operates without battery using capacitor charged by rectified HF pulses |
| 04/10/1991 | EP0421647A2 Transmitters and transmitter circuits |
| 04/10/1991 | EP0421646A2 Transmitters and receivers with antennas |
| 04/10/1991 | EP0421630A2 Multi-purpose display module system for an electronic instrument |
| 04/10/1991 | EP0421533A1 Predistortion apparatus for a digital transmission system |
| 04/10/1991 | EP0421532A1 Predistortion apparatus for a digital transmission system |
| 04/10/1991 | EP0421259A2 Digital signal encoding apparatus |
| 04/10/1991 | EP0420974A1 Tunable resonance amplifier. |
| 04/09/1991 | US5007105 Portable |
| 04/09/1991 | US5007104 For a radio |
| 04/09/1991 | US5007050 Bidirectional digital serial interface for communication digital signals including digitized audio between microprocessor-based control and transceiver units of two-way radio communications equipment |
| 04/09/1991 | CA1282877C Transmitter/receiver apparatus |
| 04/09/1991 | CA1282870C2 Method of making metal printed circuit panels wherein circuitry thereon is connected to signal ground by means of mesas |
| 04/09/1991 | CA1282835C2 Metal printed circuit panels including mesas for coupling circuitry thereon to signal ground |
| 04/09/1991 | CA1282834C Portable communications receiver with separate information presentation means and improved battery saving function |
| 04/07/1991 | WO1991005411A1 Process for transmitting a signal |
| 04/07/1991 | CA2026820A1 Predistortion arrangement for a digital transmission system |
| 04/07/1991 | CA2026819A1 Predistortion arrangement for a digital transmission system |
| 04/04/1991 | WO1991004613A1 Portable device for drink flask and radio |
| 04/03/1991 | EP0420745A2 Digital signal encoding apparatus |
| 04/03/1991 | EP0420584A2 PLL demodulating circuit in traffic information receiver |
| 04/03/1991 | EP0420504A2 Radio housing |
| 04/03/1991 | EP0420448A2 Multi-system AM stereo receiver having preferred mode of operation |
| 04/03/1991 | EP0420230A2 Feed forward spread spectrum signal processor |
| 04/03/1991 | EP0419776A2 On-Vehicle Receiver |
| 04/03/1991 | CN2074478U Radio with alarm |
| 04/02/1991 | US5005183 Wireless telephone system |
| 04/02/1991 | US5005084 Remote control television system using supplementary unit for simplified personalized control |
| 04/02/1991 | US5004989 Oscillator for controlling a mixer stage in a tuner |
| 04/02/1991 | CA1282466C Variable capacitance circuit |
| 03/31/1991 | CA2026368A1 Transmitters and receivers with antennas |
| 03/31/1991 | CA2026341A1 Transmitters and transmitter circuits |
| 03/28/1991 | DE4029463A1 TV receiver demodulation circuit - has combined T-bridge blocking circuit stage with parallel circuits for UHF and VHF bands |
| 03/27/1991 | EP0419047A2 Spread spectrum communications system using chirp modulation |
| 03/27/1991 | EP0418403A1 Remote control device for a television receiver |
| 03/27/1991 | EP0418270A1 Fm radio reception unit. |
| 03/27/1991 | CN1012248B Method of generating amplitude-modulated isb transmission signal and apparatus for carrying out method |
| 03/26/1991 | US5003621 Direct conversion FM receiver |
| 03/26/1991 | US5003620 Tuner circuit and receiving band change-over circuit with a push-pull amplifier |
| 03/26/1991 | US5003591 Functionally modifiable cable television converter system |
| 03/26/1991 | US5003576 Analog/digital voice storage cellular telephone |
| 03/26/1991 | US5003556 Squelch circuit |