| 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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| 06/28/1977 | US4032717 Circuit arrangement for a continuous adjustment of the base width in a stereo decoder |
| 06/28/1977 | US4032715 Circuit arrangement of a stereo-hunting device in a stereo decoder |
| 06/21/1977 | US4031473 Station selecting device having improved monitor |
| 06/21/1977 | US4031472 Mixer circuit |
| 06/21/1977 | US4031469 Receiver gain calibration |
| 06/21/1977 | US4031468 Receiver mount |
| 06/21/1977 | US4031417 Apparatus for coupling a digital data generator to a digital data readout device with electrical isolation therebetween |
| 06/21/1977 | US4031334 Apparatus for magnetic recording and/or reproducing of signals received by one or more signal receiving devices |
| 06/21/1977 | US4031330 Digital radio transmission system |
| 06/14/1977 | US4030129 Pulse code modulated digital audio system |
| 06/14/1977 | US4030069 Redundant message metering network |
| 06/14/1977 | US4030040 Received signal selecting system |
| 06/14/1977 | US4030036 Bandwidth changing circuit |
| 06/14/1977 | US4029906 Automatic noise reduction system of FM stereo receiver |
| 06/14/1977 | US4029904 Receiver circuit for automatic correction of DC level disturbances |
| 06/07/1977 | US4028731 Apparatus for compression coding using cross-array correlation between two-dimensional matrices derived from two-valued digital images |
| 06/07/1977 | US4028645 Automatic impedance matching using resistive and reactive diodes |
| 06/07/1977 | US4028627 Sample and hold valley detector |
| 06/07/1977 | US4028625 Sideband analyzer for AM transmitters |
| 05/31/1977 | US4027332 Apparatus for monitoring television receivers |
| 05/31/1977 | US4027276 Transmitter for a coded electronic security system |
| 05/31/1977 | US4027249 Vehicle radio control unit |
| 05/31/1977 | US4027248 Motion picture broadcasting sound delivery system |
| 05/31/1977 | US4027242 Double superheterodyne multichannel receiver with a phase-locked loop frequency synthesizer |
| 05/31/1977 | US4027100 Code transmission system having buffers of approximately equal capacities on both transmitting and receiving sides |
| 05/24/1977 | US4025953 Frequency synthesizer tuning system for television receivers |
| 05/24/1977 | US4025857 Television tuner circuit |
| 05/24/1977 | US4025856 Antenna apparatus |
| 05/24/1977 | US4025855 Multi-channel R.F. transducer with channel selector coupled to selected channel filter |
| 05/24/1977 | US4025737 Repeater monitoring and fault location |
| 05/24/1977 | US4025723 Real time amplitude control of electrical waves |
| 05/17/1977 | US4024577 Controlled power supply for a television receiver equipped with remote control |
| 05/17/1977 | US4024477 Received signal frequency indicating system |
| 05/17/1977 | US4024461 FM discriminator |
| 05/10/1977 | US4023108 Electronically controllable tuning device having a frequency synthesizer |
| 05/10/1977 | US4023106 Input circuit of VHF television set tuner |
| 05/03/1977 | US4021752 Phase locked loop for use with local oscillator |
| 05/03/1977 | US4021739 Distress signal protection system |
| 04/26/1977 | US4020421 Muting circuit |
| 04/26/1977 | US4020419 Electronic system for automatically tuning to a selected television channel |
| 04/26/1977 | US4020292 Band-compressor device |
| 04/26/1977 | US4020291 System for time compression and expansion of audio signals |
| 04/19/1977 | USRE29189 Self-balancing hybrid circuit |
| 04/19/1977 | US4019150 PA protection circuit for a single sideband radio |
| 04/19/1977 | US4019141 Preselector cavity arrangement and RF selectivity assembly |
| 04/19/1977 | US4019140 Methods and apparatus for reducing intelligible crosstalk in single sideband radio systems |
| 04/19/1977 | US4018994 Compatible AM stereophonic receivers |
| 04/12/1977 | US4017828 Redundancy system for data communication |
| 04/12/1977 | US4017797 Headset for receiving and transmitting signals |
| 04/12/1977 | US4017677 Squelch circuit for a video record player |
| 04/05/1977 | US4016497 Feedbackward distortion compensating circuit |
| 04/05/1977 | US4016366 Compatible stereophonic receiver |
| 03/22/1977 | US4013966 Fm rf signal generator using step recovery diode |
| 03/22/1977 | US4013964 Automatic gain control means for a single sideband radio receiver |
| 03/22/1977 | US4013962 Improved receiver selecting (voting) system |
| 03/22/1977 | US4013959 Transmitter control apparatus |
| 03/22/1977 | US4013957 Channel-selecting apparatus for a multichannel transceiver |
| 03/22/1977 | US4013834 Ghost signal erasing system |
| 03/15/1977 | USRE29154 Transceiver channel selector |
| 03/15/1977 | US4012643 Noise elimination circuit |
| 03/15/1977 | US4012595 System for transmitting a coded voice signal |
| 03/15/1977 | US4012593 Bidirectional repeater in data transmission system |
| 03/08/1977 | US4011542 Redundant data transmission system |
| 03/08/1977 | US4011513 Tuning device for a radio receiver |
| 03/08/1977 | US4011410 Communication system interface circuits |
| 02/22/1977 | US4009441 Multi-band television tuning apparatus |
| 02/22/1977 | US4009375 Monitoring system for vehicles |
| 02/22/1977 | US4009051 Solar power pack apparatus |
| 02/15/1977 | US4008439 Processing of two noise contaminated, substantially identical signals to improve signal-to-noise ratio |
| 02/15/1977 | US4008438 Rat-race mixer circuit |
| 02/15/1977 | US4008436 Channel selecting apparatus |
| 02/15/1977 | US4008356 Cell retaining casing for photographic cameras |
| 02/01/1977 | US4006456 Loop fault location and isolation |
| 02/01/1977 | US4006447 Audibility-control system for radio receiver |
| 02/01/1977 | US4006419 Pulse interference blanking circuit for radio receivers |
| 02/01/1977 | US4006306 Audio signal processing apparatus |
| 01/25/1977 | US4005367 Mobile transceiver housing assembly |
| 01/25/1977 | US4005274 Pulse-code modulation communication system |
| 01/18/1977 | US4004229 Ear attachable miniaturized radio receiver |
| 01/18/1977 | US4004228 Portable transmitter |
| 01/18/1977 | US4004226 QAM receiver having automatic adaptive equalizer |
| 01/18/1977 | US4004109 Hybrid circuit |
| 01/11/1977 | US4002991 Pilot signal extracting circuitry |
| 01/11/1977 | US4002987 Circuit arrangement for limiting the transmission speed of data signals |
| 01/11/1977 | US4002860 Transmitting and receiving apparatus |
| 01/11/1977 | US4002847 Fault isolation in a serial-looped transmission system |
| 01/04/1977 | US4001830 Radio receiver set with rotatable antenna |
| 01/04/1977 | US4001732 Calibration oscillators for noise reduction systems |
| 01/04/1977 | US4001731 Device for optionally realizing two mutually complementary functions |
| 01/04/1977 | US4001709 Active dual channel tuning control |
| 01/04/1977 | US4001696 Electronic antenna |
| 01/04/1977 | US4001524 Apparatus for transmitting and receiving pulses |
| 12/28/1976 | US4000475 Audio amplifier arrangement |
| 12/28/1976 | US4000467 Automatic repeater stressing |
| 12/28/1976 | US4000369 Analog signal channel equalization with signal-in-noise embodiment |
| 12/21/1976 | US3999138 Detector for AM-FM signals |
| 12/21/1976 | US3999132 Stereo inhibit circuit |
| 12/21/1976 | US3999060 Device for receiver for optical signals |
| 12/14/1976 | US3997913 Electronic time compressor/expander utilizing magnetic storage |
| 12/14/1976 | US3997843 Monocycle pulse generator |