| 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) |
|---|
| 06/23/1991 | CA2025307A1 Fading bit error protection for digital cellular multi-pulse speech coder |
| 06/20/1991 | DE4003082C1 Sound broadcasting station receiver esp. UHF car radio - controls frequency of mixing oscillator using program memory for subcarriers |
| 06/19/1991 | EP0433198A1 Amplitude modulation transmission system with suppressed carrier maintaining the polarity of the transmitted signal |
| 06/19/1991 | EP0433015A2 Variable bit rate coding system |
| 06/19/1991 | EP0432316A1 Local communication bus system comprising a set of interconnected devices, a control bus, and a set of signal interconnections, and a device and a switchbox for use in such system |
| 06/19/1991 | CN1012925B Circuit arrangement for linearly amplifying and demodulating am-modulated signal, and integrated semiconductor for said circuit arrangement |
| 06/18/1991 | US5025486 Wireless communication system with parallel polling |
| 06/18/1991 | US5025452 Full-duplex, sub-band spread spectrum communications system |
| 06/18/1991 | US5024414 Stabilizing device for hand-held/portable electronic device |
| 06/13/1991 | WO1991008645A1 Tuning apparatus |
| 06/13/1991 | WO1991008624A1 Method and apparatus for random fm noise cancellation |
| 06/13/1991 | DE4031431A1 Traffic information radio car receiver - switches from stereo to mono reproduction mode when traffic announcement is detected |
| 06/13/1991 | DE4000899C1 Interference signal detector at output of HF receiver - compares output signals of two separated input branches at different amplification levels |
| 06/13/1991 | DE3940295A1 High frequency transmitter with controlled output power - uses switched digital reference level to control output power |
| 06/12/1991 | EP0431896A2 Power amplifying unit using a power amplifying module |
| 06/12/1991 | EP0431397A2 Homodyne receiver for cable television converter |
| 06/12/1991 | EP0431341A2 Interfering signal rejection circuitry for electronic article surveillance system and method employing same |
| 06/12/1991 | EP0431201A1 Linear transmitter |
| 06/12/1991 | EP0431126A1 Frequency-jumping data transmission on a meteorite channel |
| 06/12/1991 | EP0221189B1 Electronically tunable fm receiver |
| 06/12/1991 | CN2078598U Dual-modulated heart-rhythum mini-telementer |
| 06/12/1991 | CN1052233A 调谐器 Tuner |
| 06/12/1991 | CA2031801A1 Variable bit rate coding system |
| 06/11/1991 | US5023940 Low-power DSP squelch |
| 06/11/1991 | US5023939 FM tuner with band extraction and optimization of a PLL FM demodulator |
| 06/11/1991 | US5023937 Transmitter with improved linear amplifier control |
| 06/11/1991 | US5023936 Method and apparatus for externally defining the operational mode of a digital radio transceiver |
| 06/11/1991 | US5023935 Combined multi-port transmit/receive switch and filter |
| 06/11/1991 | US5023933 Superheterodyne SCA receiver and method for the manufacture thereof |
| 06/11/1991 | US5023932 Radio communication system comprising a portable unit carrying out a battery saving operation related to a scanning operation of a fixed unit |
| 06/11/1991 | US5023909 Multi-system AM stereo receiver having preferred mode of operation |
| 06/11/1991 | US5023905 Pocket data receiver with full page visual display |
| 06/11/1991 | US5023890 Digital peak noise reduction circuit |
| 06/11/1991 | US5023609 Digital deemphasis circuit |
| 06/11/1991 | US5023594 Electromagnetic radiation |
| 06/05/1991 | EP0430531A2 Technique for determining signal dispersion characteristics in communications systems |
| 06/05/1991 | EP0430469A2 A signal quality detecting circuit for FM receivers |
| 06/05/1991 | EP0430468A2 Signal-to-noise ratio indicating circuit for FM receivers |
| 06/05/1991 | EP0430034A2 Automatic gain control |
| 06/05/1991 | EP0429914A2 Tuning circuit |
| 06/05/1991 | EP0429871A2 Cellular telephone system capable of reducing intermodulation distortion at portable telephone |
| 06/05/1991 | EP0429568A1 Identification system using hertzian waves, consisting of an interrogation station and a responder unit. |
| 06/05/1991 | EP0354955A4 Improved multi-band programmable compression system |
| 06/05/1991 | CN1012779B Surface mount filter with integral transmission line connection |
| 06/04/1991 | US5022052 Analog signal binary transmission system using slope detection |
| 06/04/1991 | US5022049 Multiple access code acquisition system |
| 06/04/1991 | US5022048 Programmable digital frequency-phase discriminator |
| 06/04/1991 | US5022047 Spread spectrum correlator |
| 06/04/1991 | US5021753 Splatter controlled amplifier |
| 05/31/1991 | CA2026812A1 Signal-to-noise ratio indicating circuit for fm receivers |
| 05/31/1991 | CA2026811A1 High-quality reception indicating circuit for fm receivers |
| 05/30/1991 | WO1991007828A1 Digital circuit for a frequency modulation and carrier synthesis in a digital radio system |
| 05/30/1991 | WO1991007820A1 Circuit arrangement for switching of rf signals |
| 05/29/1991 | EP0429202A2 Wireless telephone system |
| 05/29/1991 | EP0429021A2 A receiver capable of quickly suppressing defective effect of multipath reflection interference |
| 05/29/1991 | CN2078060U Freqency modulation receiver with automatic switch |
| 05/29/1991 | CN1051833A Circuit arrangement for switching of rf signals |
| 05/29/1991 | CN1051832A Soft handoff in cdma cellular telephone system |
| 05/28/1991 | US5020150 Combination radio and eyeglasses |
| 05/28/1991 | US5020147 FM/AM broadcast signal converter |
| 05/28/1991 | US5020145 AM/FM band selector |
| 05/28/1991 | US5020143 Vehicular radio receiver with stored detour data |
| 05/28/1991 | US5020141 Adaptive identifying signal detector |
| 05/28/1991 | US5020138 Radio communication apparatus having cooling means |
| 05/28/1991 | US5020137 Case-mounted receiver with antenna |
| 05/28/1991 | US5020136 Battery pack antenna suitable for use with two-way portable transceivers |
| 05/28/1991 | US5020135 Computerized multistandard, field-convertible, multiregional/multiservice, remote controllable, remote programmable mobile two-way radio system with digital serial bus link, built-in programmer and autodiagnostics |
| 05/28/1991 | US5020104 Method of reducing the useful bandwidth of bandwidth-limited signals by coding and decoding the signals, and system to carry out the method |
| 05/28/1991 | US5020093 Cellular telephone operable on different cellular telephone systems |
| 05/28/1991 | US5020092 Dual-bandwidth cellular telephone |
| 05/28/1991 | US5020075 Direct sequence spread spectrum modulation apparatus |
| 05/28/1991 | US5020056 Reduction of synchronous fading effects by time hopping of user slots in TDMA frames |
| 05/22/1991 | EP0428444A1 Method for synchronization search during reception of a spread spectrum modulated signal |
| 05/22/1991 | EP0428151A2 Distortion canceling fiber optic transmission system |
| 05/22/1991 | EP0428046A2 Data transmission methods and apparatus, data processing apparatus and a neural network |
| 05/22/1991 | CN2077618U Multifunctional microphone of karaok |
| 05/22/1991 | CN1051644A Anti-noise single-band communication radio station |
| 05/21/1991 | US5018165 Communication system using spread spectrum and leaky transmission line |
| 05/21/1991 | US5018136 Multiplexed digital packet telephone system |
| 05/21/1991 | US5018013 Programmable audio/video signal interface |
| 05/21/1991 | US5016326 Belt clip |
| 05/16/1991 | WO1991007029A1 Radio receiver, in particular for vehicles |
| 05/16/1991 | WO1991007020A1 Soft handoff in a cdma cellular telephone system |
| 05/16/1991 | WO1991007016A1 A phase locked loop for producing a reference carrier for a coherent detector |
| 05/16/1991 | DE3937934A1 Schaltungsanordnung zur durchschaltung von hf-signalen Circuit arrangement for switching RF signals |
| 05/15/1991 | EP0427206A2 Transmitter phase and amplitude correction for linear FM systems |
| 05/15/1991 | EP0427164A2 Noise reduction circuit for FM receiver |
| 05/15/1991 | EP0427158A1 Battery saving method for portable pager |
| 05/14/1991 | US5016273 Dual communication mode video tape recorder |
| 05/14/1991 | US5016257 Receiver for bandspread signals, particularly GPS receiver |
| 05/14/1991 | US5016256 Spread spectrum intercept apparatus and method |
| 05/14/1991 | US5016255 Asymmetric spread spectrum correlator |
| 05/14/1991 | US5015965 Predistortion equalizer with resistive combiners and dividers |
| 05/14/1991 | CA1284183C Portable radio telephone having power saver |
| 05/08/1991 | EP0426452A2 Battery saving system for interrupting power supplies at intervals variable with traffic pattern |
| 05/08/1991 | EP0426175A2 Am radio receiver |
| 05/08/1991 | DE4033574A1 Automobile control system modified for each driver - supplies required control characteristic information from memory dependent on identified driver |
| 05/08/1991 | DE3937003A1 Mobile radio telephone - has built-in miniaturised tape recorder for messages or direct recording |
| 05/08/1991 | DE3936577A1 Rundfunkempfaenger, insbesondere fahrzeugempfaenger Rundfunkempfaenger, especially fahrzeugempfaenger |
| 05/08/1991 | CA2029363A1 Data transmission methods and apparatus, data processing apparatus and a neural network |