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| Number | Title | Issue Date |
| 7974581 | Transmitter A transmitter suppresses a peak level of a multi-carrier signal produced by synthesizing a plurality of carrier signals. Specifically, a peak level suppression signal for a multi-carrier signal is generated. The generated peak level suppression signal is adjusted in... | 07/05/2011 |
| 7440729 | Apparatus, methods and articles of manufacture for output impedance matching using multi-band signal processing Apparatus, methods and articles of manufacture for output impedance matching in multi-band power amplification are provided, wherein an output matching configuration comprising one or more output matching sections, a multi-band diplexer and a switch are connected to... | 10/21/2008 |
| 7372891 | Signal generator and decoder A signal generator and decoder are used for a single sideband spread spectrum signal. A single sideband spread spectrum signal generator and decoder in which single sideband modulation using a complex spreading code is achieved with improved correlation properties, ... | 05/13/2008 |
| 7369624 | Carrier suppression type modulator with encoded modulating signals A carrier suppressed information signal modulation arrangement employs a plurality of serially coupled modulators. Each of the serially coupled modulators has a carrier input, a modulating signal input and a modulated carrier output. A carrier is applied to the carr... | 05/06/2008 |
| 7366264 | Method and system for reducing noise in a multi-carrier signal A receiver 100 for receiving a multi-carrier signal comprises detection means for detecting 801 the presence of impulse interference within the signal and identifying one or more samples of the signal affected by the impulse interference, means for sel... | 04/29/2008 |
| 7263713 | Television signal distributor apparatus, receiver apparatus, television signal transmission system and method In a television signal transmission system, CS broadcasting signals received via a master antenna are converted into intermediate frequency signals in an LNB (Low Noise Block Down Converter). The CS intermediate frequency signals then undergo conversion of the modul... | 08/28/2007 |
| 7218924 | Method for restricting calls to a cell phone The present invention is a method for restricting calls to a cell phone, including the steps of: receiving restriction information; testing an incoming call to the cell phone against the restriction information; and, if testing determines that the incoming call is r... | 05/15/2007 |
| 7215927 | Radio communication apparatus and radio transmission method In order to improve system throughput in a radio transmitting apparatus of a multicarrier system in which transmission is performed simultaneously to a plurality of receiving stations using subcarriers, subcarriers are divided into blocks, a receiving station is sel... | 05/08/2007 |
| 7050796 | Method of controlling the auditory response of wireless devices Cellular telephones, pagers, PDAs, and other wireless devices, are configured to network together when in close proximity with each other, measure the relative sound pressure level of their environment, and modify the auditory response of the wireless device based o... | 05/23/2006 |
| 7020177 | Method and apparatus to transfer information Briefly, in accordance with an embodiment of the invention, a method and apparatus to transfer information is provided, wherein the method includes transferring information between at least two wireless devices using a waveform that includes a first sinusoidal signa... | 03/28/2006 |
| 6999524 | Arrangement for controlling the output power of an HF transmitter The invention relates to an arrangement for controlling the output power of a high-frequency transmitter. The control power of the transmitter output stage is controlled according to a correcting variable (R) and by means of an actuator, whereby said variable is obt... | 02/14/2006 |
| 6978026 | Circuit arrangement for gaining a stereo subcarrier and an RDS carrier According to the invention, a circuit arrangement for gaining a 38 kHz stereo subcarrier and a 57 kHz RDS carrier for decoding a stereo signal comprised in a demodulated FM signal and/or an RDS signal comprised in a demodulated FM signal, having a simple structure w... | 12/20/2005 |
| 6970689 | Programmable mixer for reducing local oscillator feedthrough and radio applications thereof A state of a programmable mixer is set during a calibration phase to minimize local oscillator feedthrough. During a calibration phase, inputs to the programmable mixer are set to zero, or to a known state and the local oscillator is set to a calibration frequency. ... | 11/29/2005 |
| 6928293 | Apparatus and method for receiving quick paging message in mobile station An apparatus and method for receiving a quick paging message in a mobile station wherein a controller for synchronizing with a second clock in a predetermined time slot and transmitting a command for obtaining a synchronization at a frequency of receiving the quick ... | 08/09/2005 |
| 6901246 | Suppressed cycle based carrier modulation using amplitude modulation A sinusoidal RF carrier is modulated for the transmission of digital binary data streams through the amplitude suppression of carrier wavelets. These wavelets are defined between zero crossover positions representing zero energy locations. This modulation is accompl... | 05/31/2005 |
| 6895252 | Economical extension of the operating distance of an RF remote link accommodating information signals having differing carrier frequencies A system for economically extending the effective operational range of an infrared remote control system having a remote control unit with an infrared transmitter, and a controlled device having an infrared receiver. The system includes a first transmitter to receiv... | 05/17/2005 |
| 6810027 | Multi-carrier transmitting apparatus and method A multi-carrier transmitting apparatus and method is described, wherein a plurality of carrier signals are combined in the digital domain and supplied to a D/A converting means (3) for converting the combined digital carrier signals into an analog signal to b... | 10/26/2004 |
| 6463039 | Method and apparatus for full duplex sideband communication The invention is an apparatus and method for using electromagnetic energy as the means of automatic data collection (ADC). The communication system that comprises the invention utilizes frequency modulated ("FM") sideband electromagnetic energy to enable ... | 10/08/2002 |
| 6426716 | Modulated pulse doppler sensor A range gated microwave motion sensor having adjustable minimum and maximum detection ranges with little response to close-in false alarm nuisances such as insects or vibrating panels. The sensor resolves direction of motion and can respond to target disp... | 07/30/2002 |
| 6243424 | Method and apparatus for AM digital broadcasting A method for AM in-band-on-channel (IBOC) digital audio broadcasting (DAB) uses a center channel signal in a central frequency band of an AM radio channel, the center channel signal is modulated by first and second versions of the program material to be t... | 06/05/2001 |
| 6125271 | Front end filter circuitry for a dual band GSM/DCS cellular phone A front end circuit for an RF dual band GSM/DCS phone includes a first channel including an elliptical high-pass filter, a first SAW filter, and a low noise amplifier and a second channel including a second SAW filter and a second low noise amplifier. The... | 09/26/2000 |
| 6081697 | Multi-carrier radio system and radio transceiver implementation A multi-carrier radio system in which pairs of subcarriers are positioned in frequency such that each subcarrier in a pair is the image of the other subcarrier in the pair. By making each subcarrier the image of another subcarrier, the radio system of the... | 06/27/2000 |
| 6058291 | Methods and apparatus for carrier suppression in a radio modulator Methods and apparatus for dynamically calibrating a modulator in a radio transmitter are provided. In a preferred embodiment an In-Phase and Quadrature (I/Q) modulator in a radio modem is calibrated by means of a modulator, a digital signal processor and ... | 05/02/2000 |
| 6023614 | Method for decoding a suppressed-carrier modulated signal in the presence of a pilot tone, particularly for FM signals A method for decoding a suppressed-carrier modulated signal in the presence of a pilot tone, comprising the steps of: extracting the pilot signal from the modulated signal; obtaining the suppressed carrier by multiplying the pilot signal by the pilot signal in... | 02/08/2000 |
| 5959550 | Remote meter reading system A remote meter reading system uses transponders adapted to transmit a spread spectrum signal which is generated by frequency modulating data with a carrier signal. The resulting output signal is then spread by phase modulating with a pseudo-random code si... | 09/28/1999 |
| 5742645 | Method of digital demodulation of a composite signal A method for digitally demodulating a complex modulation signal and allowing different parameters to be transmitted thereby. The input signal is baseband filtered and a complex demodulation is performed on the first subcarrier at a frequency Fp to obtain ... | 04/21/1998 |
| 5619248 | Video signal distribution system microwave radio link for transmitting double sideband phase modulated carrier signal In a video signal distribution system in which a plurality of video signals are modulated onto individual carrier signals spaced over a band of frequencies to form a composite signal for transmission over cables of the system, a point-to-point radio link ... | 04/08/1997 |
| 5507024 | FM data-system radio receiver An FM stereo radio data-system receiver has a front end including an FM discriminator that produces a composite signal composed of an AM stereo signal, including a 19 KHz pilot, and an AM digital-data signal. A dual-bandwidth phase locked loop (PLL) locks... | 04/09/1996 |
| 5491839 | System for short range transmission of a plurality of signals simultaneously over the air using high frequency carriers A transmitter/receiver system for the simultaneous transmission and reception of plural audio signals over the air for a short range using carrier signals of frequencies over 900 MHz. A combined signal having a plurality of carrier signals, each modulated... | 02/13/1996 |
| 5448768 | Aircraft data communication employing existing voice channels A system for communicating data between an aircraft and ground unit over conventional amplitude modulated (AM) voice radio channels employs a data collection unit for collecting data desired to be transmitted, such as global positioning system (GPS) data,... | 09/05/1995 |
| 5373265 | Modulator having oscillator for generating IF and RF signals by division and up-conversion Apparatus and method for effecting single sideband suppressed carrier modulation suitable for small, hand-held, high-frequency cellular radio transmitters such as those used at 900 mHz. A local oscillator generates a signal at 0.8 the frequency of the des... | 12/13/1994 |
| 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 |
| 5249202 | Radio communication In a transparent tone-in-band (TTIB) single-sideband-modulated communication system used to communicate digital data; to compensate for variations due, eg, to doppler shift of the pilot tone in the received signal, during the sweep of the frequency of a l... | 09/28/1993 |
| 5214397 | Modulator using low-pass filter as delay element A push-pull modulator stage 70 has two possible transmission paths, an electrically short path (7) and a phase delay path (6) with a phase delay element providing a phase shift of approximately 180°. The phase delay element has the form of a low pass fil... | 05/25/1993 |
| 5200715 | Waveform modulation and demodulation methods and apparatus A new method of modulating and demodulating signals and circuitry therefor is disclosed. The modulation circuit defines a non-linear voltage current transfer function wherein at low voltage levels the current voltage transfer function is substantially lin... | 04/06/1993 |
| 5179588 | Improved page party system A page party system for use in industrial environments, having a plurality of stations joined by a page line and by a single party line for providing multiple full-duplex conference calls over the single party line. Multiple full-duplex conferencing is ac... | 01/12/1993 |
| 5159703 | Silent subliminal presentation system A silent communications system in which nonaural carriers, in the very low or very high audio frequency range or in the adjacent ultrasonic frequency spectrum, are amplitude or frequency modulated with the desired intelligence and propagated acoustically ... | 10/27/1992 |
| 5153536 | Suppressed carrier modulator formed from two partial modulators each including a phase delay path A modulator suitable for 16 quadrature amplitude modulation (QAM) is designed as a double modulator (1), wherein a 16 QAM modulator (39) consists of two double modulators (1). One double modulator (1) has two partial modulators (1',1") forming a bridge. E... | 10/06/1992 |
| 5134630 | Method and apparatus for transparent tone-in-band transmitter, receiver and system processing In deriving a control signal for recombining the parts of the spectrum separated by a frequency notch in transparent tone-in-band signals, cross-correlation products give rise to undesirable frequency and phase jitter. In a receiver which overcomes this p... | 07/28/1992 |
| 5077542 | Transmission system with suppressed carrier signal amplitude modulation preserving the polarity of the transmitted signal, and corresponding transmitter and receiver A system of transmission with amplitude modulation for the transmission of signals of all types, analog and/or digital, requiring high performance characteristics with respect to the noise induced by the transmission channel, comprising, at transmission, ... | 12/31/1991 |
