| 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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| 05/26/1983 | WO1983001873A1 Telemetry system with signal booster for digital data transmission through a transmission line |
| 05/25/1983 | EP0079825A2 Improved selectivity means in amplitude modulated radio receivers |
| 05/24/1983 | US4385401 Three-state digital mixer-driver circuit |
| 05/24/1983 | US4385244 Extraneous signal separating device |
| 05/24/1983 | CA1147051A1 Automatic transmission or recording or transmission and reception control system |
| 05/17/1983 | US4384367 MDS Receiver |
| 05/17/1983 | US4384366 Interference compensation system |
| 05/17/1983 | US4384361 Selective calling receiver |
| 05/17/1983 | CA1146667A1 Ghost cancelling system |
| 05/17/1983 | CA1146475A1 Control level displaying apparatus |
| 05/11/1983 | EP0019630B1 Intermediate frequency sensing circuit |
| 05/10/1983 | US4383334 Intermodulation cancelling mixer |
| 05/10/1983 | US4383323 Spread spectrum FH-MFSK transmitter and receiver |
| 05/10/1983 | CA1146259A1 Dynamic audio-radio interconnection system |
| 05/10/1983 | CA1146080A1 Decreasing time duration of recorded speech |
| 05/04/1983 | EP0078180A2 A communication system interconnecting radios and operators located at different positions |
| 05/03/1983 | US4382160 Methods and apparatus for encoding and constructing signals |
| 05/03/1983 | US4382159 Blow actuated microphone |
| 05/03/1983 | CA1145833A1 Device for locating persons |
| 04/27/1983 | EP0077351A1 Direct current magnetized hybrid transformer. |
| 04/26/1983 | US4381566 Electronic tuning antenna system |
| 04/26/1983 | US4381561 All digital LSI line circuit for analog lines |
| 04/26/1983 | CA1145491A1 Rf amplifying system having image rejection |
| 04/26/1983 | CA1145402A1 Automatic turn-off apparatus for a radio or television receiver |
| 04/20/1983 | EP0077216A1 Radio system |
| 04/19/1983 | US4380832 Portable radio communication device having signal processing circuit with presetting function |
| 04/19/1983 | US4380824 Receiving reproducing system |
| 04/19/1983 | US4380823 Multi-channel signal processing circuit formed in a semiconductor integrated circuit |
| 04/19/1983 | US4380822 Transmit-receive switching circuit for radio frequency circulators |
| 04/19/1983 | US4380816 Apparatus for recycling complete cycles of a stored periodic signal |
| 04/19/1983 | US4380814 Baseband data switching apparatus for digital communications system |
| 04/19/1983 | US4380809 Automatic power supply system |
| 04/19/1983 | US4380767 Controlled antenna tuner |
| 04/19/1983 | US4380690 Hybrid circuit |
| 04/19/1983 | CA1145000A1 Transmitter apparatus for an information transmission system |
| 04/13/1983 | EP0076415A1 Expander for noise reduction of compressed audio signals |
| 04/12/1983 | US4380089 Battery-powered transmitter including current control circuit |
| 04/12/1983 | US4380082 Digital signal receiver with FM interference elimination capability |
| 04/12/1983 | US4380062 Communication system providing simultaneous two-way transmission |
| 04/12/1983 | US4380061 Loop transmission system with improved bypass routing arrangement |
| 04/12/1983 | US4379949 Method of and means for variable-rate coding of LPC parameters |
| 04/12/1983 | CA1144650A1 Predictive signal coding with partitioned quantization |
| 04/06/1983 | EP0076009A1 Tuning circuit incorporating a frequency synthesizer circuit |
| 04/06/1983 | EP0075888A2 Method for transmitting bandlimited speech signals with protection against eavesdropping |
| 04/06/1983 | EP0075859A2 Signal diagnostic method and apparatus for multiple transmission system |
| 04/06/1983 | EP0075788A1 Method for monitoring a radio receiving equipment |
| 04/06/1983 | EP0075591A1 Frequency synthesized transceiver |
| 04/05/1983 | US4379271 Input selection arrangement for applying different local oscillator signals to a prescaler of a phase-lock loop tuning system |
| 04/05/1983 | US4379269 RF Amplifier having automatic gate bias switching in response to band selection |
| 04/05/1983 | US4379207 Automatic noise eliminating device for an FM receiver |
| 04/05/1983 | CA1143954A1 Timer circuit |
| 03/31/1983 | WO1983001163A1 Balanced current multiplier circuit for a subscriber loop interface circuit |
| 03/31/1983 | WO1983001162A1 Electronic terminator circuit |
| 03/30/1983 | EP0075332A2 Receiver circuit |
| 03/30/1983 | EP0075311A2 Arrangement for speech transmission based on the channel vocoder principle |
| 03/29/1983 | US4378604 Receiver having a search tuning circuit |
| 03/29/1983 | US4378603 Radiotelephone with hands-free operation |
| 03/29/1983 | US4378472 Two to four wire hybrid circuit arrangement for a pulse code modulated time multiplex telecommunication system |
| 03/29/1983 | CA1143801A2 Radio apparatus for collecting information emanating from a multiplicity of stations |
| 03/23/1983 | EP0074858A2 Radio receiver |
| 03/22/1983 | US4377871 Transmit security system for a synthesized transceiver |
| 03/22/1983 | US4377858 Digital two-to-four wire converter for full duplex signals |
| 03/22/1983 | US4377730 Tone elimination circuit |
| 03/16/1983 | EP0074295A1 Passive microwave duplexer using semi-conductors |
| 03/16/1983 | EP0074054A1 Data under voice communications system |
| 03/15/1983 | US4377003 Testing device for electronic circuits and especially for portable radios |
| 03/15/1983 | US4376916 Signal compression and expansion system |
| 03/15/1983 | EP0055287A4 Transform modulation system. |
| 03/09/1983 | EP0073707A1 Receiver with a frequency display device |
| 03/09/1983 | EP0073420A2 Reception stage for radio and television receivers |
| 03/08/1983 | CA1142661A1 Manual channel selecting device |
| 03/08/1983 | CA1142660A1 Electronic tuning radio receiver |
| 03/08/1983 | CA1142596A1 Intermediate frequency detection circuit |
| 03/03/1983 | WO1983000787A1 System for maximum efficiency transfer of modulated signals utilizing line systems |
| 03/03/1983 | WO1983000673A1 Improved moisture and dust seal arrangement for a portable radio or the like |
| 03/02/1983 | EP0073165A1 Microwave switch |
| 03/01/1983 | CA1142237A1 Radioelectric apparatus for collecting data coming from several stations |
| 02/23/1983 | EP0072403A2 Demodulator for spread spectrum frequency-modulated signals |
| 02/22/1983 | US4375015 Improved electronic hybrid circuit |
| 02/22/1983 | CA1141826A1 Automatic frequency control system |
| 02/15/1983 | US4374304 Spectrum division/multiplication communication arrangement for speech signals |
| 02/15/1983 | CA1141452A1 Asynchronous data receiver |
| 02/15/1983 | CA1141442A1 Selective amplifier |
| 02/09/1983 | EP0070949A1 Transmission method for voice and digital data and arrangement for carrying out said method |
| 02/09/1983 | EP0070948A1 Voice coding method and arrangment for carrying out said method |
| 02/08/1983 | US4373209 Method and circuitry for controlling the intermediate frequency of an FM receiver to lessen phase distortion |
| 02/08/1983 | US4373206 Transmitter control system |
| 02/08/1983 | US4373205 Radio subscriber system with efficient use of radio frequency carrier waves |
| 02/08/1983 | US4372580 Automatic seatbelt system |
| 02/08/1983 | CA1141050A1 Antenna automatic tuning apparatus |
| 02/01/1983 | US4371980 Self aligning band-pass filtering system |
| 02/01/1983 | US4371973 Apparatus for transforming, transferring and re-transforming of a sampled signal |
| 02/01/1983 | US4371867 Transmitting signals over alternating current power networks |
| 02/01/1983 | US4371749 Circuit for processing angle modulated broadcast signals |
| 01/26/1983 | EP0070695A2 Radio receiver for frequency shift keyed signals |
| 01/26/1983 | EP0070287A1 High frequency communications. |
| 01/25/1983 | US4370745 Fail-safe transmission system |
| 01/25/1983 | US4370643 Apparatus and method for compressively approximating an analog signal |
| 01/25/1983 | US4370626 Output coupling circuit for LC local oscillator |
| 01/25/1983 | US4370622 IMD Limiter |