Patents
Sitemap › H04 - Electric communication technique › H04B - Transmission › 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
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)
12/1978
12/26/1978US4131849 Two-way mobile radio voice/data shared communications system
12/26/1978US4131765 Method and means for improving the spectrum utilization of communications channels
12/19/1978US4130805 Noise clearing system
12/19/1978US4130803 Radio equipped protective helmet
12/19/1978US4130734 Analog audio signal bandwidth compressor
12/19/1978CA1044814A1 Method and apparatus for encoding data and clock information in a self-clocking data stream
12/19/1978CA1044765A1 Broadcast receiver
12/19/1978CA1044764A1 Audio processor circuit for an fm-stereo radio receiver
12/12/1978US4129842 U-shaped microstrip resonant circuit
12/12/1978US4129751 PCM data throttle
12/12/1978CA1044365A1 Adjustable antenna mount for radio receiver
12/12/1978CA1044328A1 Skirt-tuned single oscillator transceiver
12/05/1978US4128849 Selectively coupled synthesizer for tuner of TV receiver
11/1978
11/28/1978US4127824 Sampling filter-detector
11/28/1978US4127820 Electrical circuit for multiplexing and dividing different bands or frequencies
11/28/1978US4127817 Transmitter detecting apparatus
11/28/1978US4127750 Apparatus for transmitting and receiving pulses
11/28/1978US4127743 Muting circuit for loudspeaker
11/28/1978CA1043429A1 Digital noise discriminator
11/28/1978CA1043422A1 Automatic change-over notification for a transceiver
11/21/1978US4126831 Electronic phase detector circuit
11/21/1978US4126828 Intermodulation antiinterference device for superheterodyne receiver
11/21/1978CA1043021A1 Multiplex speech transmission system with speech analysis-synthesis
11/21/1978CA1042991A1 Receiver with automatic pass band control
11/14/1978CA1042515A1 Information signal transmitting system
11/07/1978US4124871 Image data resolution change apparatus and process utilizing boundary compression coding of objects
11/07/1978US4124870 Method for improving print quality of coarse-scan/fine-print character reproduction
11/07/1978US4124819 Disturbing signal detection circuit
11/07/1978US4124818 Arrangement for monitoring signal-to-interference ratio in a radio transmission system
11/07/1978US4124817 Bandwidth switching circuit for intermediate frequency amplifier stage in FM receiver
11/07/1978US4124780 FM stereophonic receiver providing a test signal
11/07/1978CA1042077A2 Method and apparatus for converting electrical signals
11/07/1978CA1042076A1 Radio frequency transmitters
10/1978
10/31/1978US4123756 Built-in miniature radio antenna
10/31/1978US4123724 Communication equipment
10/31/1978US4123715 Program apparatus for radio receiver using frequency synthesizer
10/31/1978US4123714 FM Receiver with liquid crystal signal indicator
10/31/1978US4123712 Symmetrical polyphase network
10/31/1978US4123711 Synchronized compressor and expander voice processing system for radio telephone
10/31/1978CA1041683A1 Channel-selecting apparatus for multichannel receivers
10/31/1978CA1041650A1 Digital remote control system
10/24/1978US4122400 Amplifier protection circuit
10/24/1978US4122399 Distortion generator
10/24/1978US4122395 Radio control circuit with microprocessor
10/24/1978US4122393 Spread spectrum detector
10/24/1978CA1041241A1 Automatic cable balancing network
10/24/1978CA1041238A1 Electronic automatic frequency tuning system
10/24/1978CA1041237A1 Electronic system for automatically tuning to a selected television channel
10/24/1978CA1041199A1 Homodyne communication system
10/24/1978CA1041193A1 Inclination detector for support member
10/24/1978CA1041183A1 Balanced dual output mixer circuit
10/17/1978US4121295 Integer weighted impulse equivalent coded signal processing apparatus
10/17/1978US4121259 Method for digital run-length coding with redundance reduction for transmission of binarily coded picture informations
10/17/1978US4121161 AM receiver
10/17/1978US4121160 Switch means for radio alarm device
10/17/1978US4121159 Method for the synchronization of a transmission path
10/17/1978CA1040766A1 Tuner with digitally coded indicia
10/10/1978US4120037 Desk-top electronic calculator and tape recorder assembly
10/10/1978US4119912 Audio frequency heterodyne means and method
10/10/1978US4119800 Radio-telephone interconnection system
10/10/1978CA1040327A1 Active hybrid sidetone producing circuitry for sidetoneless telephone
10/03/1978US4118598 Amplitude modulated impatt diode oscillator and a low cost communication system using same
10/03/1978CA1039854A1 Delta modulation apparatus
09/1978
09/26/1978US4117466 Beat frequency interference rejection circuit
09/26/1978US4117414 Signal conditioning circuit
09/26/1978US4117406 Muting arrangement for am synchronous detector using a pll circuit
09/26/1978US4117405 Narrow-band radio communication system
09/26/1978CA1039379A1 Apparatus for monitoring a redundant multi-channel analog system
09/26/1978CA1039365A1 Signal transfer circuit
09/19/1978US4115737 Multi-band tuner
09/19/1978CA1038934A1 Spectrum notcher
09/19/1978CA1038932A1 Reliable earth terminal for satellite communications
09/12/1978US4114115 Compandor apparatus
09/12/1978US4114105 Noise blanker circuit
09/12/1978US4114100 Rapid tuning circuit for high frequency receivers
09/12/1978US4114097 Frequency shift signal receiver
09/12/1978US4113997 Analog to digital signal of logarithmic format converter and analog to pseudo-rms value converter and echo canceller utilizing same
09/12/1978US4113996 Voltage controlled current sources for active hybrid circuit
09/12/1978CA1038499A1 Apparatus for data compression encoding and decoding
09/05/1978US4112498 Digital correlation receiver
09/05/1978US4112378 Television tuner circuit for selection of VHF and UHF/VHF converted television signals
09/05/1978US4112377 C. B. converter
09/05/1978US4112375 Tunable selective super heterodyne receiver
09/05/1978US4112371 Muting and tuning indicator system for an FM receiver
09/05/1978US4112254 Signal compander system
09/05/1978CA1038043A1 Remote power control apparatus
08/1978
08/29/1978US4110784 Noise reduction apparatus
08/29/1978US4110724 Apparatus for transmission of messages by means of electromagnetic waves
08/29/1978US4110699 Adaptive audio compressor
08/29/1978US4110695 Tuning circuit for high frequency receivers
08/29/1978US4110693 Lockup inhibiting arrangement for a phase locked loop tuning system
08/29/1978US4110690 Channel selecting device
08/29/1978US4110561 Communication unit for code generation and voice communication
08/29/1978CA1037566B Circuit arrangement for suppressing interferences in an fm radio receiver
08/22/1978US4109207 Coding member for programming of a radio communication apparatus
08/22/1978US4109206 Signal strength meter drive circuit
08/22/1978US4109202 Traffic switching in communications satellites
08/22/1978CA1037126A2 Digital radio control
08/15/1978US4107624 Automatic frequency-tracking circuit
08/15/1978US4107614 Muting control circuit for FM receiver
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