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| Number | Title | Issue Date |
| 5369470 | FM receiver which detects and responds to receiving and interference states An FM receiver includes an IF unit followed by an LF unit, the IF unit having an IF filter arrangement. The center frequency of the IF filter arrangement, which is relatively narrow-banded with respect to the channel bandwidth, is controlled in dependence... | 11/29/1994 |
| 5369786 | Enhanced power level usage in a radiotelephone system A radiotelephone system allows a subscriber unit (125) to transmit above a predetermined maximum power level. The maximum power level is set at a source base-station (130) and corresponds to the maximum power level a subscriber unit (125) can transmit at ... | 11/29/1994 |
| 5369803 | Car-mounted booster for plug-in connection with mobile telephone set A car telephone is disclosed that is included in a car telephone system and selectively operable in a car-mounted mode or in a portable mode. A portable unit and a telephone antenna constitute a mobile car telephone set, while a car antenna, a power ampli... | 11/29/1994 |
| 5367330 | Pay-per-view television delivery system Method and apparatus are provided for controlling and delivering television programming from a control station to one or more substations, which in turn transmit television programming to remote receiving locations on a pay-per-view basis. Programming is ... | 11/22/1994 |
| 5365264 | Video network system with computer LAN A bi-directional video signal transmission system is equipped with transmission lines having coupled upsteam and downstream segments. With the entire band of a RF signal being taken as a modulation frequency band, an image signal modulated to a frequency ... | 11/15/1994 |
| 5361406 | Audio level equalization of broadcast and national weather service FM radio signals A television receiver includes a single tuner for tuning both television channels and broadcast FM stations. The tuner serves as the first conversion stage of a double conversion FM receiver, wherein the mixer of an FM radio integrated circuit serves as t... | 11/01/1994 |
| 5361399 | Adaptive communication system for transmitting between base stations and portable transceivers via different data rate communication links A data communication system is provided for generating information at a source (12) and transmitting it to a non-fixed subscriber transceiver unit (STU) (14). The information is first transmitted through a public telephone network (10) to a master station... | 11/01/1994 |
| 5361402 | Test device for analyzing communication channels in a trunked radio system A test device (101) for use in a trunked radio system (102) employs a received signal strength indicator (RSSI) detector (120) to analyze transmission parameters. The test device (101 ) includes a transceiver (118) for transmitting and receiving radio sig... | 11/01/1994 |
| 5361408 | Direct conversion receiver especially suitable for frequency shift keying (FSK) modulated signals A direct conversion receiver for providing a direct conversion of a radio frequency signal having a carrier frequency comprises a local oscillator for substantially equal frequency to the carrier, and a semiconductor integrated circuit mounting mixers and... | 11/01/1994 |
| 5355532 | Television tuner unit having shield housing The present invention relates to a television tuner capable of receiving television broadcasting, CATV and satellite broadcasting. The television tuner includes a double superheterodyne tuner for receiving television signals, having an up-converter, a dow... | 10/11/1994 |
| 5355513 | Transponder with reply frequency derived from frequency of received interrogation signal A transponder includes a receiver for receiving a radio interrogation signal. The transponder also includes a phase locked loop decoder for deriving a reference signal from the received interrogation signal, and a radio transmitter for transmitting a tran... | 10/11/1994 |
| 5355515 | Method and apparatus for estimating initial time alignment in a cellular communications network A method and apparatus for use in a cellular mobile radio telephone system for initially setting a time alignment parameter in a mobile station. The method comprises the steps of estimating an optimal time alignment parameter for use during communication ... | 10/11/1994 |
| 5355525 | Method for operating a hand-held transmitter for controlling vehicle functions The present invention provides a method of operating a hand-held transmitter for controlling vehicle functions. The hand-held transmitter has the ability to emit output signals for controlling both locking devices and drives for closing vehicle openings. ... | 10/11/1994 |
| 5355529 | Paging system with satellite time base A satellite (26) is operable to transmit timing information to a plurality of paging sites having towers (10) associated therewith and satellite receivers (48) associated therewith. This provides a simulcast transmission of the timing information such tha... | 10/11/1994 |
| 5355523 | Wireless transmission/reception system including transmitting terminal producing multiple frequency local oscillation signals and receiving terminal storing a local oscillation signal A wireless transmission system includes a plurality of terminal units, a specific one of which is provided with a transmission/receiving circuit that transmits a reference signal of a local oscillation frequency, while all others of which are provided res... | 10/11/1994 |
| 5349699 | Radio receiver with masking of switchover noise The Radio Data System (RDS) protocol promulgated by the European Broadcasting Union provides for alternate frequencies (AF) for the same broadcast. Receivers periodically switch over to such an alternate frequency, leading to momentary crackling noises. I... | 09/20/1994 |
| 5349701 | Method and apparatus for broken link detect using audio energy level A noise detector (56, 56'), suitable for use in a radio frequency (RF) communications device, such as a CT-2 base station (12) or handset (20), detects a broken RF link by sampling the energy level of a signal for a short period of time. Thus, the audio s... | 09/20/1994 |
| 5349700 | Antenna tuning system for operation over a predetermined frequency range A tunable antenna system operates over a predetermined frequency range with an antenna having a length and width each significantly less than a quarter wavelength within the predetermined frequency range. A controllable reactive element is coupled to the ... | 09/20/1994 |
| 5349698 | Radio communication system for a selected one of a plurality of terminal units of different kinds In a radio communication apparatus which is capable of using a selected terminal unit selected from a plurality of terminal units, a logic part detects the kind of the selected terminal unit to produce a type signal representative of the selected kind. Re... | 09/20/1994 |
| 5345594 | Information transmission system retransmitting information signals according to retransmission schedule An information transmission system in which an information signal supplied from a base station is automatically edited at relay stations and retransmitted to terminal stations according to a retransmission schedule assigned to each relay station. The tran... | 09/06/1994 |
| 5345597 | Call set-up in a radio communication system with dynamic channel allocation The call set-up technique of this invention is characterized by the use of channel information from both base station and subscriber terminal in determining the radio traffic channel upon which to set-up a new call. Communication between the base station ... | 09/06/1994 |
| 5345592 | Signal transfer and power delivery system for a television camera station A television production system provides both signaling and power over a single coaxial cable between a television control station and a remote camera station. The control station includes a power delivery unit for coupling with the coaxial cable for deliv... | 09/06/1994 |
| 5345606 | RDS radio receiver with user-definable-region filtering Memory devices containing route-specific features as well as standardized texts are provided in vehicle receivers having a decoder for decoding digitally encoded, received traffic news. By addressing the memory locations, these texts can be called up. In ... | 09/06/1994 |
| 5345605 | Individual selective-calling receiver with reduced number of switches An individual selective-calling receiver is disclosed which includes a switch, a first timer for generating an output signal in a case where the switch is put in an ON-state for a time longer than a first predetermined time, a second timer started by the ... | 09/06/1994 |
| 5345599 | Increasing capacity in wireless broadcast systems using distributed transmission/directional reception (DTDR) A method and apparatus for increasing the capacity of wireless broadcast communications system from a central studio to a plurality of users in a service area is disclosed. Given a source signal whose high information rate exceeds the practical informatio... | 09/06/1994 |
| 5345598 | Duplex power control system in a communication network Measurements of mobile signal strength received at the base station are used to determine the portion of power that should be transmitted by the base station to a particular mobile. Each of a plurality of mobiles measure the relative strength of the base ... | 09/06/1994 |
| 5339456 | Method and circuit for non-cooperative interference suppression of radio frequency signals This invention provides a method and circuit for separating a signal of interest from an angle modulated interfering signal in which a composite signal, including the signal of interest and the interfering signal, is used to produce first and second signa... | 08/16/1994 |
| 5339463 | FM receiver with muting circuit FM receiver including means for controlling the center frequency of an IF filter, which is relatively narrow-banded with respect to the channel bandwidth, in dependence on the desired modulation, the receiver including a signal processing unit comprising ... | 08/16/1994 |
| 5339462 | Broadband mixer circuit and method A signal mixing apparatus comprising first and second four port signal splitting/combining networks having no relative phase shift between three ports and 180° of phase shift between the remaining ports, coupled to a four port mixer element. The mixer el... | 08/16/1994 |
| 5339453 | AGC circuit for radio receiver having AGC sensitivity compensated by if output signal An AGC circuit comprising a first level wave-detecting circuit for wave-detecting received signals having been band-limited, having a sensitivity being particularly high for a central frequency of a desired channel and a sensitivity being low for the othe... | 08/16/1994 |
| 5335369 | Automatic power control circuit for use with a radio telecommunication apparatus An automatic power control (APC) circuit for use with a radio telecommunication apparatus. The apparatus transmits radio frequency signals at a power level prescribed by a level control signal. In the automatic power control circuit, transmission power le... | 08/02/1994 |
| 5335362 | Method of tuning and compensating the received signal strength indicator in a radio telephone In the method of tuning the received signal strength indicator the tuning results for selected operating conditions are stored in the microprocessor (10) memory. When the radio telephone (1) is in use, the received signal strength indicator (RSSI) reading... | 08/02/1994 |
| 5335355 | Mobile radio communication system utilizing analog and digital modulation A mobile radio communication system is provided with a base station apparatus connected to a wire circuit, a mobile radio station apparatus which is connected to the base station apparatus by a radio circuit, a mode designation device for selecting either... | 08/02/1994 |
| 5331412 | Tamper resistant apparatus for a CATV system A circuit is supplied at the tap from a feeder which monitors certain signals coming from the single dwelling interdiction unit (SDI unit), and if the signals are interrupted, removes service from the premises. In order for service to be reinstituted to t... | 07/19/1994 |
| 5327578 | Radio telephone system supporting automatic busy and out-of-range indications A radio telephone communication system (200) having a base station (203) including at least one frequency agile time division duplex transceiver (207) for facilitating communication with at lest one radio telephone (100) on the at least one radio frequenc... | 07/05/1994 |
| 5327581 | Method and apparatus for maintaining synchronization in a simulcast system A simulcast system (FIG. 16) capable of synchronizing and maintaining synchronization of a plurality of base sites (1602, 1604, 1606, 1608) is coupled to a transmitter controller (226). The plurality of base sites (1602, 1604, 1606, 1608) is capable of tr... | 07/05/1994 |
| 5327584 | Portable radio having cover releasing mechanism and receive switch which are operable together A cover movably connected to a body of a radio is formed with an engaging hole for locking. A locking engaging projection formed in the radio body can move between the disengaging and engaging positions with respect to the engaging hole, and a switch oper... | 07/05/1994 |
| 5327583 | Using a clock signal generated by a microcomputer for providing a negative bias voltage to a galium arsenide field effect transistor in a high frequency amplifier of the device In a mobile radio communication device, a gain of a GaAs FET for high frequency power amplification is controlled by a negative voltage based on a clock signal generated by a microcomputer in the device.... | 07/05/1994 |
| 5327580 | Full duplex RF repeater/base station providing microprocessor-controlled simultaneous CTCSS tone encode/decode A microcomputer within a duplex RF transceiver operates in an interrupt-driven manner to simultaneously encode and decode CTCSS signalling (with one microcomputer interrupt service routine being devoted to CTCSS encode, and another microcomputer interrupt... | 07/05/1994 |
| 5327576 | Handoff of a mobile station between half rate and full rate channels In a cellular mobile telephone system of the type having TDMA channels, a plurality of mobile station operate at either a full rate or a half rate. If the mobile stations are operating on the periphery of a cell they are assigned to full rate channels. If... | 07/05/1994 |
