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| Number | Title | Issue Date |
| 7436908 | UWB transceiving apparatus and method for dynamically reducing interference A UWB receiver having at least one communication module with a limited working band whose on/off state can be controlled. The UWB receiver is adapted to detect power intensity of a received radio signal in the limited working band based on an on/off state of said at... | 10/14/2008 |
| 7430420 | Cell selection and inter-frequency handover The present invention provides a method and an apparatus for controlling a communications system that includes a mobile wireless device, a first and a second base station and a radio network controller. The communications system may allocate frequency bands to users... | 09/30/2008 |
| 7379751 | Multi-band transceiver and radio communication device using the transceiver A multi-band transceiver has a function of sharing transmitted and received signals of multiple frequency bands by the same antenna. The multi-band transceiver mounts multiple filters that correspond to the multiple frequency bands and multiple amplifiers for amplif... | 05/27/2008 |
| 7376446 | Mobile communications network with expanded carrier capacity and method of expanding base station carrier capacity A base station for a mobile communications system, a mobile communications system including the base station and a method of increasing base station capacity. Each base station antenna is coupled to a transmission line that may be connected to a triplexer. The tripl... | 05/20/2008 |
| 7343140 | Tuner A tuner is provided for selecting, independently of each other, a plurality of radio frequency channels for simultaneous reception. The tuner comprises a plurality of up converters whose outputs are combined in a combiner. Each up converter operates independently of... | 03/11/2008 |
| 7299012 | Circuit to add and subtract two differential signals An electrical circuit to add and subtract differential input signals may be implemented using distributed differential transmission lines having a length substantially equal to one quarter of a wavelength of the differential input signals according to an effective e... | 11/20/2007 |
| 7171177 | Communication apparatus and method using human body as medium Provided is to a communication apparatus and method using a human body as a medium, in which secure/normal data signals are transmitted/received to the inside and outside of a human body respectively, through at least two different frequency channels classified acco... | 01/30/2007 |
| 7102465 | Frequency discrete LC filter bank An inductive (“L”)-capacitive (“C”) filter bank has application for use in a television receiver. The LC filter includes inductors configured in at least one inductive (“L”) bank, and capacitors configured in at least one capacitive (“C”) bank. The i... | 09/05/2006 |
| 7088202 | Methods and apparatus for an improved discrete LC filter A discrete inductive-capacitive (LC) filter selects between at least two inductor banks to tune the LC filter. The filter receives an input signal that includes one or more bands of frequencies. A control signal selects a band of frequencies for processing. A first ... | 08/08/2006 |
| 6940365 | Methods and apparatus for an improved discrete LC filter A discrete inductive-capacitive (LC) filter selects between at least two inductor banks to tune the LC filter. The filter receives an input signal that includes one or more bands of frequencies. A control signal selects a band of frequencies for processing. A first ... | 09/06/2005 |
| 6915146 | Method and apparatus for receiving a plurality of different codes at a plurality of different frequencies A receiver capable of receiving a plurality of different codes at a plurality of different frequencies is set forth herein. The receiver offers digital frequency control by using a controller driven signal diode to add or remove capacitance to or from a band pass fi... | 07/05/2005 |
| 6895228 | High frequency low-pass filter A low pass filter (LPF) can realizes a sophisticated transmission filter usable in a dual-band application. The transmission filter features a compact size, a low cost, a lower insertion loss, and an excellent harmonics-suppression characteristic. In the LPF, a high... | 05/17/2005 |
| 6310863 | Dual-band data communication device The direction of rotation of the phase of signals in a dual-band digital demodulation processing means 110 and a dual-band digital modulation processing means 112 is controlled in accordance with a band selection control means 113 for selecting a first-ba... | 10/30/2001 |
| 6163684 | Broadband frequency synthesizer A broadband frequency synthesizer including a first local oscillator signal generated in a first phase locked loop. A second local oscillator signal is generated in a second phase locked loop. Third and fourth phase locked loops provide inputs to the seco... | 12/19/2000 |
| 5710999 | Radio frequency apparatus A radio frequency apparatus has a tuner unit which is disposed in a tuner unit housing, and a demodulation unit which is disposed in a demodulation unit housing easily attached or removed to the tuner unit housing by a connecting device provided on side w... | 01/20/1998 |
| 5369798 | Method and circuit for saving the power of a battery used in a portable radio telephone The portable radio telephone performs the channel scanning for one of the two channel systems "A" and "B" divided from a cellular service band to select two channels with largest RSSIs. The main processor determines which one of the two channels receives ... | 11/29/1994 |
| 5339117 | Tuning apparatus for television system and method of controlling the same Tuning apparatus for a television system, comprising a rotary encoder having a slidable and rotatable channel changing mechanism, the rotary encoder outputting a plurality of signals with a phase difference with respect to one another, corresponding to a ... | 08/16/1994 |
| 4602222 | Circuit for bandswitching a voltage controlled oscillator A circuit is provided which is capable of band switching a voltage controlled oscillator (VCO) while maintaining the relative sensitivity of the voltage controlled device and, hence, the control line voltage itself. The circuit includes an array of capaci... | 07/22/1986 |
| 4518993 | Television signal receiving system A television receiver for receiving standard television channel signals and a scrambled television channel signal includes a channel selector which selects one of the television channel signals, a tuner which tunes the selected television channel signal, ... | 05/21/1985 |
| 4499495 | Switching diplexer for single antenna input television receivers The VHF and UHF tuners of a television receiver are coupled by a switchable diplexing circuit to a single antenna input terminal. The diplexing circuit includes a first electronic switching means responsive to a U/V bandswitch control signal connected bet... | 02/12/1985 |
| 4461038 | Television tuner circuit A tuner used in a television receiver or the like, when one supply voltage is given as a band switching voltage from a one-circuit triple-contact switch to selectively switch a VHF low band, a VHF high-band or a UHF band, a second contact of the switch se... | 07/17/1984 |
| 4438529 | TV Tuner circuit A TV tuner circuit having a dual-gate MES FET in a UHF RF amplifier and a dual-gate MOS FET in a VHF RF amplifier which are both controlled by a single AGC voltage source. The source of the MES FET is always connected to a DC source voltage input through ... | 03/20/1984 |
| 4408346 | Key assembly A key assembly for receiving devices employed in communication engineering, particularly for broadcasting and television receivers, comprises a casing provided with mutually releasable keys in the form of press buttons adapted to switch on storable, selec... | 10/04/1983 |
| 4377004 | Setting circuit To render a setting circuit more suited to the use of a microprocessor, the frequency of pulses applied by a setting shaft are periodically measured and the value found is multiplied by a weighting factor which depends on the speed of rotation of the sett... | 03/15/1983 |
| 4352203 | Station selecting device A station selecting device which comprises: a plurality of variable resistors, grouped into several reception bands, the variable resistors in each group being connected in parallel; band selection switches for selectively supplying power to the variable ... | 09/28/1982 |
| 4326295 | Television tuner circuit A television tuner comprises a VHF tuner section and a UHF tuner section and is configured in the two tuned modes of VHF high band and VHF low band between which the input tuning circuit of the VHF tuner section is switched by a diode in response to a sou... | 04/20/1982 |
| 4307467 | Continuous tuning arrangement for a multiband television receiver A varactor controlled tuning system for a television receiver includes first, second and third separated resistive sections formed on a dielectric substrate, a movable contact and means for moving the movable contact along the resistive sections. First an... | 12/22/1981 |
| 4298851 | Presettable tuning apparatus A presettable tuning apparatus includes a digital tuner; a source of digital signals representing radio frequencies to which the tuning apparatus is respectively tuned; an addressable memory having a plurality of sequentially addressable storage locations... | 11/03/1981 |
| 4270218 | Continuous tune all-channel selector Disclosed is a UHF-VHF combination channel selector for use with varactor diode tuners in which varactor control voltage is provided by a plurality of tapered potentiometers covering the various tuning segments. Non-detent, continuous channel selection is... | 05/26/1981 |
| 4266295 | Continuous tuning control particularly adapted for use in variable frequency receivers and generators This disclosure describes a continuous tuning arrangement for a variable frequency response circuit of the type covering a relatively wide frequency range. Many techniques for accommodating a wide frequency range are known and include synthesizers, wavefo... | 05/05/1981 |
| 4263674 | Multi-band voltage variable capacitance tuner having automatic and manual tuning operations A tuning apparatus includes a dial plate marked with broadcast frequencies thereon, a guide shaft provided in parallel with the dial plate, a substrate having a resistive layer thereon, the resistive layer having varying resistance values distributed ther... | 04/21/1981 |
| 4254504 | Control apparatus for a transceiver employing a programmable memory A transceiver is controlled in operation by a programmable read only memory (PROM). The memory is accessed directly via a series of switches and when accessed, provides output data necessary to control the operation of the transceiver by controlling the f... | 03/03/1981 |
| 4249256 | Continuous tuning arrangement for a multiband television receiver A television tuning system for generating a tuning voltage for a varactor controlled local oscillator includes a continuous resistive element having first, second, third and fourth points along its resistive path which define first, second and third resis... | 02/03/1981 |
| 4249255 | Continuous tuning arrangement for a multiband television receiver A tuning system includes a resistive element coupled between two terminals and a movable contact which is moved along the resistive element to determine the tuning position. A switching arrangement selectively couples predetermined voltages to the termina... | 02/03/1981 |
| 4232395 | Multiband radio receiver with electronic preset tuning system A multiband radio receiver having an electronic preset tuning system is provided with a switch which is ganged with a preset switch in the electronic preset tuning system, so that an automatic frequency control is interrupted from a local oscillator in pr... | 11/04/1980 |
| 4225971 | Tuning apparatus for providing tuning indication Tuning apparatus which is tunable to different broadcast frequencies and including a scale provided with indicia corresponding to such broadcast frequencies and a pointer movable across the scale to indicate the particular broadcast frequency to which the... | 09/30/1980 |
| 4210828 | Device for improving output waveform of manually controllable pulse generator for use in preset electronic tuning control device An output waveform of a manually operable tuning pulse generator of an electronic preset type tuning control device of a tuner using varactor diodes for a multi-band radio receiver is improved by using Schmitt trigger circuit means which may be provided w... | 07/01/1980 |
| 4204169 | Muting circuit in an electronic tuning type receiver Muting is provided for a receiver during preset channel selection by using the output signals from each channel selection switch to energize a muting circuit. During manual channel selection or during the resetting operation no muting is provided.... | 05/20/1980 |
| 4186360 | Digital channel selecting apparatus A digital channel selecting apparatus for selecting a channel among a plurality of channels which are distributed in at least a relatively higher and lower frequency regions, wherein a plurality of capacitance elements are coupled in parallel, each consti... | 01/29/1980 |
| 4177429 | Switching arrangement for combination VHF-UHF tuners A switching arrangement for VHF-UHF tuners is provided wherein changeover from VHF operation to UHF operation is accomplished by employing wiping action stator contacts and with a minimum of connections between the VHF and UHF tuners.... | 12/04/1979 |
