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| Number | Title | Issue Date |
| 7606184 | Multiplexers employing bandpass-filter architectures A multiplexer, such as a diplexer, is delineated. The multiplexer may be employed in a communications system that may communicate in multiple frequency bands within a predefined range of frequencies, e.g., 2400 MHz-4900 MHz. The communications system may operate in ... | 10/20/2009 |
| 7263072 | System and method for selecting a communication band A system and method for making a band selection in a wireless communications device is provided. The available bands include a first-communication band, a second communication band, and an auxiliary band. A wideband diplexer provides a wideband path, which includes ... | 08/28/2007 |
| 7196595 | Multilayer diplexer A multilayer diplexer has a first I/O terminal, a second I/O terminal, an antenna terminal, a high-pass filter coupled between the antenna terminal and the second I/O terminal, and a low-pass filter coupled between the antenna terminal and the first I/O terminal. Th... | 03/27/2007 |
| 7031672 | Direct conversion transmitter system and method with quadrature balancing and low LO feed through A system and method are provided for communicating a radio frequency (RF) signal. In use, a baseband signal is mixed with a plurality of oscillator signals with different phases in an interleaving manner. The mixed baseband signal is then communicated as an RF signa... | 04/18/2006 |
| 6975841 | Diplexer, and high-frequency switch and antenna duplexer using the same A diplexer capable of passing signals of a high frequency band without being attenuated over a wide frequency band, and a high-frequency switch using the diplexer are provided. The diplexer includes a low-pass filter 82 having a parallel resonant circuit form... | 12/13/2005 |
| 6950410 | Frequency multiplexer Multiple circuits connected to a common terminal are switched where the frequency bands to be conducted through the circuits are close. Each circuit has an independent signal path to the common terminal which contains a filter and a device. Each device has a first a... | 09/27/2005 |
| 6563801 | Cable interface for data and power supply The cable interface unit in accordance with the invention allows use of the same wire in one cable both for base-band transmission of data between telecommunication equipment in full duplex form and also for transmission of an operating voltage (V) from o... | 05/13/2003 |
| 6512765 | Exchange An exchange equipment using STM able to achieve an improvement of an efficiency of use and an improvement of ease of increase of terminal cards, that is, an STM type exchange, including a time switch, for performing exchange processing of time division mu... | 01/28/2003 |
| 6275475 | System and method for maintaining spectral capacity in time division duplex (TDD) systems A communications system (100) has at least one TDD platform pair (130, 200) operating synchronously using a Time Division Duplex (TDD) frame structure. A TDD platform pair (130, 200) has first communications platform (124) and second communications platfo... | 08/14/2001 |
| 6240139 | Apparatus and method for repeating simultaneously transmitted signals on a single transmission path A repeater circuit (10) includes a decoder arrangement (34) and an encoder arrangement (33). The decoder arrangement (34) is connected to an input transmission line to receive an input encoded signal comprising a signal at one of four encoded voltage leve... | 05/29/2001 |
| 6185434 | Antenna filtering arrangement for a dual mode radio communication device A dual mode radio apparatus has an integrated filtering part (51) which includes an antenna port (51a) for connection to an antenna (21), at least one port (51b, 51c, 51d) for connection to each of the system-specific radio-frequency parts (54, 55) of the... | 02/06/2001 |
| 6072363 | Facility for combining and amplifying two broadband signals A facility (VOR) is disclosed for combining and amplifying two broadband signals which are received from different transmission networks (NET1, NET2) and are transmitted in transmission channels separated in frequency. The facility (VOR) contains a broadb... | 06/06/2000 |
| 6060961 | Co-polarized diplexer An apparatus and associated method of manufacture for coupling a receiver and a transmitter to a single antenna feed horn so as to allow for the simultaneous transmission and reception of co-polarized signals, such as in a radio frequency communications s... | 05/09/2000 |
| 5901151 | System for orthogonal signal multiplexing A high frequency signal and a low frequency signal are coupled onto a pair of conductors providing a communication link between two computer components. The high frequency signal may be a differentially coupled Fibre Channel 8B/10B encoded signal. A diple... | 05/04/1999 |
| 5864584 | Circuitry for allowing two drivers to communicate with two receivers using one transmission line The present invention allows for the simultaneous transmission of two digital signals from one integrated circuit to another. The two digital signals are encoded utilizing a voltage divider circuit and are then transmitted by one transmission line to the ... | 01/26/1999 |
| 5802187 | Two-channel programmable sound generator with volume control Disclosed is a programmable sound generator for generating digital outputs of tone and noise signals used for producing computer sound effects. The programmable sound generator includes at least two channels generating digital output serving as either ton... | 09/01/1998 |
| 5742897 | Matching transformer for dual-band radio receiver A dual-band radio receiver utilizes a single transformer to provide impedance matching between signal mixers from separate signal paths to their respective intermediate frequency filters. Thus, a dual-band radio receiver can be made eliminating one transf... | 04/21/1998 |
| 5673292 | AM-PSK system for broadcasting a composite analog and digital signal using adaptive M-ary PSK modulation A radio-frequency broadcasting system and method for simultaneously broadcasting analog and digital signals in a standard AM broadcasting channel wherein the system includes: a transmitter for providing, and broadcasting, a composite signal containing an ... | 09/30/1997 |
| 5604747 | Modular contiguous output multiplexer A modular, multi-channel, contiguous output, multiplexer which combines directional filters with the diplexed output of two multi-channel multiplexers, each covering a contiguous frequency band, i.e., one is a low multiplexer and the other a high multiple... | 02/18/1997 |
| 5502715 | Integrated diplexer-amplifier for near antenna installation There is disclosed an integrated diplexer-amplifier for near antenna installation apparatus that routes amplified microwave signals in two different directions at the same time from RF input signals derived from two different sources. The apparatus makes ... | 03/26/1996 |
| 5469430 | Method and devices for simultaneous transmission of two heterochronous binary signals on the same transmission medium In a method for simultaneous transmission of two heterochronous binary signals in the form of a single binary signal on a common physical medium, the second binary signal is timed by a bit clock whose period is greater than the minimal duration allowed fo... | 11/21/1995 |
| 5446729 | Compact, low-intermodulation multiplexer employing interdigital filters An improved multiplexer comprises a housing, a transmission line transformer section within the housing extending in a first direction, and at least two interdigital transmission line filters adjacently disposed within the housing along the first directio... | 08/29/1995 |
| 5432780 | High capacity sectorized cellular communication system A cellular radiotelephone communication system cell site equipment is provided. The cell site equipment includes a radio frequency transmitter operating as one signal frequency source. In addition, the cell site equipment includes a first and a second sig... | 07/11/1995 |
| 5367533 | Dynamic capacity allocation CDMA spread spectrum communications A dynamic capacity allocation spread spectrum CDMA communications system for overlaying, at least in part, geographically and in frequency a radio-relay system. A first receiver, located near the relay receiver of the radio-relay system, measures a first ... | 11/22/1994 |
| 5233602 | Switching system for computers with 2-bit condition-representing signals In a switching system, two electronic appliances, such as computers, operable under an on-line condition or a standby condition, and a single condition-switching controller capable of supplying condition-switching instructions to the two electronic applia... | 08/03/1993 |
| 5155724 | Dual mode diplexer/multiplexer A broadband diplexer for use in dividing input signals in accordance with frequency and in constructing multiplexers including multiple diplexers. The diplexer includes a pair of 0-degree couplers one of which is configured as a signal splitter while the ... | 10/13/1992 |
| 5115450 | High speed digital to analog to digital communication system High speed communication of digital information is accomplished using an analog transmission format. A transmitter receiving digital data in parallel multi-bit words converts digital words in conversion clock cycles to a single analog signal relative to a... | 05/19/1992 |
| 4980661 | Diplexer for coupling RF signals, as well as a DC sawtooth signal, to an antenna A diplexer couples a plurality of RF signals and a strobe signal to the antenna of an emergency transmitter buoy. A plurality of filters in the diplexer each pass a preselected signal to the antenna and block other signals from being reflected into the si... | 12/25/1990 |
| 4903125 | Method and apparatus for conveying information signals Video signals from a source are digitized and applied to a source coder which segregates the signals into four channels (CH1 to CH4) of progressively less visual significance. CH1 carries basic picture information at a relatively low resolution. CH2 to CH... | 02/20/1990 |
| 4814634 | Ternary signal multiplexor circuit The multiplexing circuit disclosed herein combines multiple input signals into a common output by allowing ternary signals to pass from multiple input circuits to a common output circuit. The circuit combines ternary signals with minimum feedback between ... | 03/21/1989 |
| 4812789 | Ridged waveguide wide band diplexer with extremely sharp cut-off properties A wideband balanced diplexer splits an incoming wideband microwave frequency signal into separate upper and lower frequency outputs and possesses a sharp band cut-off to increase effective bandwidth. The diplexer includes a pair of waveguide assemblies fo... | 03/14/1989 |
| 4677686 | Passive transmission of data over cable TV systems A communications system which enables enhanced services to be provided over cable TV systems. The design of the system is such that amplification is not required. Therefore, two-way transmission is possible on the low band of "two-way capable" cable syste... | 06/30/1987 |
| 4623921 | Antenna diplexer utilizing aural input for visual service A television broadcasting system uses an antenna diplexer to combine signals generated from visual and aural power amplifiers. The diplexer comprises first and second hybrids coupled together by transmission lines which have aural-frequency cavities for r... | 11/18/1986 |
| 4545048 | Service integrated digital transmission system A service integrated transmission system for transmitting, over a light transmission path, digital signals having a transmission band whose upper limit frequency corresponds to the maximum bit rate of the signals to be transmitted, the transmission being ... | 10/01/1985 |
| 4467472 | Diplexer for the separation of a signal and of a supply current A diplexer is disclosed for use in remotely fed intermediate regenerators or repeaters of broad-band transmission systems with coaxial cable sections. The diplexer has a high circulating attenuation at high frequencies. Since sections of the regenerator a... | 08/21/1984 |
| 4427953 | Microwave diplexer Apparatus for processing microwave signals at two predetermined frequencies. Signals at a first predetermined frequency are received or transmitted at one end (input port) of a microwave transmission line whose other end is utilized as a common output por... | 01/24/1984 |
| 4366572 | Data transmission system A data transmission system including transmission stations for transmitting a plurality of different kinds of input data and receiving stations for receiving only one kind of the data transmitted from the transmission stations. A transmission station is a... | 12/28/1982 |
| 4271508 | Method for transmitting data A method is disclosed for transmitting data between two time multiplex systems via a joint or common transmission path. Bit flows output by two time multiplex systems at the transmitter side are chronologically bit-wise interlaced with the aid of a diplex... | 06/02/1981 |
| 4240155 | Diplexer and multiplexer A plurality of different frequency signals f1, f2, f3, . . . fn are combined for transmission in a common transmission line by a series of hybrid circuits each including a through coupler for feeding through frequency sign... | 12/16/1980 |
| 4182932 | A-m stereo system Means and method for generation and combination at a transmitting apparatus and separation and demodulation at a receiving apparatus of two signals comprising carrier waves of the same frequency but having different phase, modulated with different program... | 01/08/1980 |
