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| Number | Title | Issue Date |
| 5389963 | System for selectively interconnecting audio-video sources and receivers A system for selectively interconnecting a plurality of audio/video sources and a plurality of audio/video communication devices including a single switch, a mixer to combine the audio and video signals as a single signal from a source to the switch and a... | 02/14/1995 |
| 5386588 | Transmission power control of mobile radiotelephone station in response to base station control signal where base station data is collected by the mobile radiotelephone station A radiotelephone communication system is provided, in which radio communication channels including control channels and a plurality of communication channels are set between a plurality of base stations and a plurality of mobile stations provided within r... | 01/31/1995 |
| 5382970 | Television viewer monitoring system including portable data meter for each viewer In a system for monitoring and collecting data on the viewing habits of television viewers or radio listeners, to enable operators of networks or television stations, programmers and advertisers to determine the numbers of viewers watching particular prog... | 01/17/1995 |
| 5355520 | In-building microwave communication system permits frequency refuse with external point-to-point microwave systems A wireless in-building RF communications system operates within a building in a microwave frequency range which is also utilized by a point-to-point microwave communication system such that frequency reuse is provided. Central modules and user modules eac... | 10/11/1994 |
| 5327577 | Handover method for mobile radio system The invention relates to a method in mobile radio systems in which the responsibility for transmitting message information to a mobile station (MS1, MS2) is handed over from at least a first base station transmitter (Bma, ... | 07/05/1994 |
| 5327230 | Video multiplying system A VCR transmission device is disclosed including a transmitting unit capable of receiving a VCR video signal, conditioning the video signal and outputting the video signal onto a home power line ordinarily carrying an AC power signal. The transmitting dev... | 07/05/1994 |
| 5319454 | CATV system enabling access to premium (pay per view) program events by bar code data entry In order to enable viewing of single events without requiring a CATV subscriber to order the event in advance, documents are distributed to subscribers containing cognizable (advertising) data concerning the event and a bar code symbol corresponding there... | 06/07/1994 |
| 5313662 | Split-ring resonator bandpass filter with adjustable zero A bandpass filter, having an input port and an output port, comprises a first microstrip split-ring resonator coupled to input port, and a second microstrip split-ring resonator coupled to the first microstrip split-ring resonator, and coupled to the outp... | 05/17/1994 |
| 5307512 | Power control circuitry for achieving wide dynamic range in a transmitter Power control circuitry (100) uses two attenuators in the transmit path to achieve wide dynamic range. An intermediate frequency (IF) attenuator (200) is placed before a mixer (212) in the IF section of the transmit path and a radio frequency (RF) attenua... | 04/26/1994 |
| 5303411 | Receiver sensitivity threshold extended with the combination of an unmodulated signal with the received signal A receiver (10) is provided where an information signal (11) is received (12) and examined to determine (20) its signal strength. When the signal strength is at least equal to a threshold, an unmodulated signal (40) is added to the received signal to impr... | 04/12/1994 |
| 5303418 | High isolation mixer A method and apparatus for improved isolation of IF, LO, and RF frequency signals from the non-associated mixer ports (e.g., avoiding introducing RF frequency signals at the IF and LO ports, and similarly vis-a-vis other signals and ports), is provided by... | 04/12/1994 |
| 5301357 | Method and system for handling improper registrations A system and method for providing automatic system deregistration for any incorrectly registered radios is described. The system and method further provides for an automatic re-registration request to be sent in order to guarantee that any valid radios th... | 04/05/1994 |
| 5287541 | Global satellite communication system with geographic protocol conversion A satellite communication system (1110) provides geographic protocol conversion for message delivery between communication transceivers (1118, 1118') operating within at least two geographic areas (1116, 1116'). The satellite based communication system (1... | 02/15/1994 |
| 5287551 | Radio communication apparatus and method for voice channel busy call back An apparatus and method for issuing busy call-backs (146) on the voice channel to busied communication units (209,211) on a trunked radio communication system (200) is disclosed. This is accomplished, in part, by issuing a busy signal (104), via a control... | 02/15/1994 |
| 5287549 | Commuication device and method using transceiver squelch control An audio squelch control for transceiver stations in which all transceivers are initially in a Call mode with the squelch control turned on. While in the Call mode, the squelch control is turned off, enabling the speaker, by receiving the station's coded ... | 02/15/1994 |
| 5280650 | DSP based radio with diminished power requirements A radio having two signal processing paths, one including a digital signal processor that consumes a relatively large amount of power and one including a signal processor that consumes a relatively small amount of power. The low power processor operates t... | 01/18/1994 |
| 5280634 | Radio control transmitter with variable function switches A radio control transmitter capable of permitting the functions of various function switches to be set as desired through only a simple switching operation without requiring replacement of a wiring. Operation switches and operation functions which are des... | 01/18/1994 |
| 5278997 | Dynamically biased amplifier An amplifier (102) which can be dynamically biased is disclosed. A controller (118) determines when to change the bias to the amplifier (102), in order to achieve low frequency splatter. This is accomplished by changing the bias level of amplifier (102) b... | 01/11/1994 |
| 5274837 | Trunked radio repeater system with multigroup calling feature A digitally trunked radio repeater system provides substantial improvements in timeliness of channel acquisition and channel drop, and in reliability of critical control signalling. The system uses a much higher digital signalling rate than is typically f... | 12/28/1993 |
| 5274836 | Multiple encoded carrier data link A modular data link having a transmit processor for receiving input data and for providing different portions of the input data at each of a plurality of outputs. A plurality of transmit channels each receive an input data portion and transmit a signal co... | 12/28/1993 |
| 5267032 | Device for detecting termination of connection to a programme to be paid for, received by a subscriber unit via an interactive remote distribution network The device of the invention comprises, in the terminal (7) of each subscriber, a carrier wave generator which sends this wave to a distribution center (1) as long as the television of this terminal is operating, the absence of this wave being detected in ... | 11/30/1993 |
| 5265273 | EMI shield for a display A process for fabricating an electromagnetic shield for a display provides for a sheet upon which a metal mesh pattern and a border surrounding the metal mesh pattern is photo-chemically etched on the sheet. In addition, a portable radio having an electro... | 11/23/1993 |
| 5263185 | AM distortion measurement method and apparatus usable on active audio carriers A test instrument for measuring hum and other AM distortion components on active audio carriers such as in a cable television distribution system. The instrument has an RF tuner capable of tuning to the audio carrier frequency for a selected channel, and ... | 11/16/1993 |
| 5263182 | Low-noise block converter for a satellite broadcasting system A system for receiving the satellite broadcasting signal which amplifies all signals within 10.95-12.5 GHz by use of a single low-noise wide-band amplifier, selects one of two local oscillators having frequencies of 10 GHz and 10.75 GHz according to a FSS... | 11/16/1993 |
| 5263194 | Zero if radio receiver for intermittent operation A radio receiver for use with a time slot paging system which receives intermittent data includes a direct coupled zero IF receiver circuit with at least one automatic gain control (AGC) amplifier stage. DC offset errors are removed from the AGC amplifier... | 11/16/1993 |
| 5263190 | Vehicular radio receiver having muting circuitry for suppressing noises caused by receiver data pulses A vehicular radio receiver includes a receiver main body provided adjacent to an antenna mounted on a vehicle body, a receiver operation unit provided in a compartment of the vehicle spaced from the receiver main body for sending a pulse signal for operat... | 11/16/1993 |
| 5263184 | Noise reducing circuit for a receiver using a fuzzy controller A noise reducing circuit for a receiver such as an FM receiver which is improved in noise reducing effect while reducing an unfamiliar feeling to and an erroneous operation of the receiver. The noise reducing circuit comprises fuzzy inference means for fu... | 11/16/1993 |
| 5261121 | Portable radio transceiver system having improved adaptor and/or improved receiver signal control arrangement In order to enable a diversity reception in a portable radiotelephone without detrimentally increasing the size and weight thereof, an adaptor to which diversity antennas are coupled and into which the radiotelephone is inserted in an in-car mode, is prov... | 11/09/1993 |
| 5257399 | Multiple access handling in a cellular communications system A method and apparatus for use in a cellular mobile radio telephone system for determining which of one of several mobile generated transmissions received in a mobile switching center, sent from the same mobile station via more than one base station, shou... | 10/26/1993 |
| 5257403 | Method of subcarrier multiplication which preserves AM Information in FM systems A multiplication circuit for use in an FM television transmitter and receiver is provided. The multiplication circuit includes a limiting circuit for limiting a subcarrier supplied thereto and a dividing circuit coupled to the limiting circuit and dividin... | 10/26/1993 |
| 5257397 | Mobile data telephone A mobile data telephone capable of transmitting and/or receiving voice and/or data signals over cellular communication channels or other air interfaces comprises a radio transceiver and a data modem in the same physical package. The transceiver and the mo... | 10/26/1993 |
| 5257099 | Central data processing station for satellite communication with local area audience response station A network of local area audience response systems is coupled together at a central audience response processing station by a satellite communication system for real time audience response analysis, nationally or internationally. Each local area station an... | 10/26/1993 |
| 5257401 | Method of maintaining an established connection in a mobile radio system comprising both analog and digital radio channels The invention relates to a method in a mobile radio system having both digital and analog radio channels. An object of the invention is that a connection established on a digital radio channel often shall be possible to maintain even when the time dispers... | 10/26/1993 |
| 5249044 | Product information storage, display, and coupon dispensing system A system for generating product coupons at remote locations. The system includes an apparatus for receiving and storing product information signals broadcast from a central location. The apparatus is connected to a television at the remote location and ha... | 09/28/1993 |
| 5247700 | Cellular telephone with pager A compact and unitary cellular/pager. The cellular/pager includes a cellular antenna for receiving UHF cellular and paging signals. The cellular/pager also includes a VHF paging antenna. Every paging signal is sent to a paging receiver. The paging receive... | 09/21/1993 |
| 5241689 | Digital signal processor audio compression in an RF base station system A radio frequency (RF) base station transmitter receiver (transceiver) system includes an audio compression arrangement that compresses a sum of multiple audio signals so that all signals within the sum are equalized to a substantially uniform audio outpu... | 08/31/1993 |
| 5241693 | Single-block filter for antenna duplexing and antenna-switched diversity A single-block ceramic filter (102) is coupled to two antennas (142 and 144) for providing both antenna duplexing and antenna-switched diversity in a duplex radio transceiver (100). One antenna (142) is coupled by the filter (102) to a transmitter (132), ... | 08/31/1993 |
| 5241694 | Circuit for forming low power levels in a transmitter of a radio telephone The present invention concerns a circuit for forming low power levels in a transmitter of a radio telephone. By a power amplifier (1) of the transmitter is formed the maximum power level and a plurality of lower power levels. As taught by the invention, v... | 08/31/1993 |
| 5241699 | Electronic surveillance device detector and method using phase angle differences between two received signals The disclosed invention detects electronic surveillance devices. Should an electronic surveillance device (a bug) be present in a room, the bug will be detecting sounds with a microphone and transmitting on some electromagnetic frequency. In the present i... | 08/31/1993 |
| 5239700 | Multi-choice information system for a motor vehicle A visual display monitor of an information system of a motor vehicle is connected not only with the usual engine and vehicle instrumentation, but also with a variety of electrical equipments installed in the motor vehicle which the driver may want to acti... | 08/24/1993 |
