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8396472 Providing multiple data streams by different networks for the same content  
Providing multiple data streams by different networks for the same content is disclosed. First and second data streams over respective first and second networks are provided. The first and second...
8384288 Electroluminescent fabric embedding illuminated fabric display  
Disclosed herein is an electroluminescent fabric embedding an illuminated fabric display. The electroluminescent fabric according to the present invention comprises: a foundation layer composed of...
8107914 RF filter with low-IF mixing, tuning and calibration  
Radio-frequency (RF) circuits, methods and systems are implemented according to a variety of embodiments. According to one such embodiment, a radio-frequency (RF) receiver circuit is implemented...
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...
7881718 Wireless communication system, handover suppression apparatus, station, communication control method and computer-readable medium storing communication control program  
When a station is connected via a connector to an AC adapter, a controller may detect the event of connection between the station and the adapter and drive a suppression signal transmitter to send...
7778652 Method and apparatus for selectively modifying a portion of a radio access network via a homeland security alert system  
A system (100) includes a mobile station (125) to initiate an outgoing communication anywhere in a coverage area (115). A base station (110) and a radio access network (105) provide wireless...
7761060 Method and apparatus for transmission of signals  
In a method and apparatus for transmission of signals, an input signal is supplied to at least one dynamic compressor and the dynamics of the signal is compressed by the dynamic compressor with a...
7620372 Communication device, method for controlling communication, game machine, and game system  
A technology for realizing real-time frequency hopping in an environment containing a plurality of masters. A game machine includes a plurality of communication modules which carry out the...
7599661 Method for generating power supply interruption time information in a contactless data carrier  
In a method for the determination of disconnection time information (DTI) significant for an inadequate power supply of an integrated circuit (2) of a data carrier (1) such as an RFID-tag. The...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
4802191 Data transmission using a transparent tone-in band system  
In previous transparent tone-in band systems the notch has been removed from the frequency spectrum before a carrier signal carrying data has been demodulated. The present specification describes...
4726069 A muiti-mode modulation and demodulation system and method  
An improved system and method for modulation, demodulation and signal processing for single sideband communications systems which provides correction for the adverse effects of rapid fading...
4710814 Television sound receiving circuit for at least one sound channel contained in an RF signal  
A television sound receiving circuit for at least one sound channel contained in an RF signal converts the transmitted or already down-converted television signal as a composite signal to the...
4633484 Receiver unit in radio communication system  
A receiver unit in a radio communication system in which a transmitter unit outputs transmission data, modulated in accordance with a multilevel QAM method and containing a leakage carrier by...
4618996 Dual pilot phase lock loop for radio frequency transmission  
A radio frequency transmission system contains at least one coherently modulated information signal, for example, a T.V. signal. At a transmission, the information signal is combined with two...
4490689 Balanced modulator using logic gates for DSBSC output  
A balanced modulator, producing a double sideband suppressed carrier (DSBSC) output achieves carrier suppression and linear performance suitable to modulate frequency division multiplexed signals...
4398062 Apparatus for privacy transmission in system having bandwidth constraint  
Source intelligence within a predetermined bandwidth is normally provided to a transmission channel having a bandwidth constraint of the predetermined bandwidth. For privacy transmission, a first...
4310920 Single sideband AM-FM stereo modulation system  
Single sideband modulation system. A first single sideband of radio frequency is generated with first audio modulation on the lower side of an assigned frequency, the first single sideband...
4241451 Single sideband signal demodulator  
A single sideband signal can be demodulated by using sampled data techniques. An intermediate frequency (IF) radio signal is split into two branches and is sampled by two sample and hold devices;...
4217661 Audio signal transmission system and method incorporating automatic frequency correction  
An improved system and method for processing relatively high fidelity audio signals having a frequency range, for example, of between about 50 Hz and 5,000 Hz for transmission over two or more...

Matches 1 - 50 out of 152 1 2 3 4 >