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7606542 Simplified high frequency tuner and tuning method  
A disclosed method tunes a signal from a channelized spectrum having a predetermined channel spacing. A signal of interest having a predetermined maximum bandwidth is mixed with a local oscillator...
7539462 Configurable multi-mode modulation system and transmitter  
A multi-mode transmitter architecture is configurable for multiple modulation modes using either polar or polar-lite modulation. Multiplexed signal paths and reconfigurable components are...
7492749 Method and system for providing multi-input-multi-output (MIMO) downlink transmission  
An approach is provided for supporting transmission in a multi-input-multi-output (MIMO) communication system including a plurality of terminals. A preamble portion of a frame is transmitted by a...
7436289 Remote keyless entry system with two modes of demodulation  
A remote signaling receiver system includes a receiver that operates in two different modes of demodulation to accommodate different types of signals from different types of transmitting devices. A...
7409193 Predistortion circuit for a transmit system  
Systems and methods related to amplifier systems which use a predistortion subsystem to compensate for expected distortions in the system output signal. A signal processing subsystem receives an...
7340257 Maximum likelihood estimation of the channel coefficients and of the DC offset in a digital baseband signal of a radio receiver using the SAGE algorithm  
The proposed iterative method concurrently calculates maximum likelihood estimated values for the channel coefficients (h 0 , . . . , h L ; θ h ) and the DC offset (d; θ d ) on the basis of a...
7286794 Method and system for joint broadcast receiving and cellular communication at mobile terminal or device without service control  
Methods and systems for communicating information via a plurality of different networks are disclosed herein. Aspects of the method may comprise receiving broadcast information in a mobile terminal...
7088956 Path search circuit, radio receiver and radio transmitter, utilizing a directional beam  
A path search circuit according to the present invention has an orthogonal multi-beam forming section 4 for directional reception with a plurality of orthogonal multi-beams orthogonal one to...
6937676 Interference-signal removing apparatus  
An interference-signal removing apparatus is provided for removing narrow-band interference signals from input signals including wide-band desired signals and the narrow-band interference signals,...
6904269 Signal type identification  
A method of identifying a signal type uses parameters of the signal as a basis for automatic identification. A signal of interest is selected from a display of a spectral waveform for a specified...
6885695 Multi-mode IFF receiver architecture  
A transponder receiver for detecting different radio frequency (RF) interrogation mode signals having relatively wide and narrow bandwidths about a common RF center or carrier frequency. A front...
6725463 Dual mode tuner for co-existing digital and analog television signals  
A dual mode tuner/receiver is disclosed in which both analog and digital signals can be received and processed. A low pass filter allows all channels below a selected frequency enter the circuit. A...
6675024 System and method for receiving analog and digital signals  
A system for receiving a transmitted signal is provided. The system includes a first receiver that can receive the transmitted signal and decode the transmitted signal according to a first...
6622008 Method and apparatus for reduction of FM interference for FM in-band on-channel digital audio broadcasting system  
This invention provides a method for reducing FM interference in an in-band on-channel digital audio broadcasting system. The method includes the steps of receiving a composite signal including a...
6510175 In-band on-channel digital broadcasting  
A system for combining AM and FM transmissions. In-band, on-channel, FM Digital Audio Broadcast (IBOC FM-DAB) allows simultaneous transmission of DAB and FM over existing FM allocations without...
6469621 Tire monitor compatible with multiple data protocols  
A tire monitor for monitoring a characteristic of tires on a vehicle includes a circuit configured to receive a first wireless signal having tire characteristic data and a first wireless protocol....
6407449 Pin layout of semiconductor integrated circuits including dual band amplifier and receiving mixer  
A pin layout which prevents degradation of a frequency characteristic of a low noise amplifier and a receiving mixer included in a semiconductor integrated circuit for dual-band...
6385262 Method and apparatus for changing the channel bandwidth that is receivable in a radio receiver  
The present invention relates to an arrangement ( 1 ) and a method in a receiver in a multi-mode mobile radio (m), wherein the intention is to design the receiver so that it uses the same hardware...
6360084 Dual-band RF power tube with shared collector and associated method  
An RF transmitter, such as a radar transmitter or a communications amplifier, is provided that includes a plurality of RF power tube sections each sharing a common collector. The RF tube sections...
6292474 Multi-frequency band nyktu-mode radio receiver and associated method having shared circuit elements  
Apparatus, and an associated method, for radio receiver circuitry operable in multi-modes to receive signals generated during operation of a multiple number of radio communication systems. The...
6208847 Receiving circuit  
A receiving circuit includes: an antenna for receiving signal waves of two different frequency hands; a first receiving circuit for receiving a first receiving signal having a frequency; a second...
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...
6014571 Multiband mobile unit communication apparatus  
A multiband mobile unit communication apparatus comprises: antennas for receiving plural radio wave SIGs respectively transmitted from plural mobile unit communication systems, the plurality of...
5995815 Multiple band receiver  
The present invention relates to a multiple band receiver comprised in a mobile terminal. The receiver is able to receive radio signals in an upper frequency band (FB U ) and a lower frequency band...
5987068 Method and apparatus for enhanced communication capability while maintaining standard channel modulation compatibility  
In a radio communication system (100), enhanced communication capability is provided while maintaining standard channel modulation compatibility. At a transmitter (110, 200, 600), a first...
5852784 Multiband mobile unit communication apparatus  
A multiband mobile unit communication apparatus is disclosed which comprises: an antenna for receiving 1st and 2nd bands of radio wave SIGs including quadrature modulation SIGs; a 1st LO CKT for...
5640694 Integrated RF system with segmented frequency conversion  
An integrated RF avionics system having a common IF interface for diverse functions, such as radar, electronic waveform(EW) and communications/navigation/identification(CNI). The interface uses a...
5577066 Charge-coupled-device based data-in-voice modem  
A data-in-voice modem is disclosed using charge coupled devices. Unique features include: (1) Baseband-to-IF upconversion to enable CCD-based demod/processing; (2) All analog (no analog-to-digital...
5554892 Signal processing circuit for switch capable of reducing insertion loss  
A high frequency power amplifier is implemented by a GaAs FET and is supplied with a positive and a negative power supply. The amplifier amplifies the power of an input signal and delivers the...
5553098 Demodulator with selectable coherent and differential data  
A selectable demodulator (32) operates in the phase domain to implement a coherent demodulation path (40) and a differentially coherent demodulation path (42). The coherent path (40) includes a...
5483693 Combining antenna element signals  
A vehicle radio receiver circuit includes two antennas for mounting on the vehicle. The antennas are significantly less than one quarter of a wavelength in length at the desired frequency of...
5437051 Broadband tuning circuit for receiving multi-channel signals over a broad frequency range  
A broadband tuning circuit adapted for receiving both BS and CS broadcasting signals. The circuit includes an input circuit for receiving RF signals which associated with the BS and CS broadcasting...
5379452 Active frequency separating circuit  
In an active circuit which separates and amplifies signals received via an antenna (A) into a higher-frequency FM band and a lower-frequency FM band, weakening of the FM signals by the AM-band...
5347542 Demodulation selection for a communication signal  
In a system where 2-level modulation and 4-level modulation of communication signals exist, an apparatus (107) demodulates either modulation scheme by demodulating (301) a received signal under the...
5280638 RF filter self-alignment for multiband radio receiver  
A variable frequency RF passband filter is aligned or calibrated to maximize the sensitivity of a radio receiver using reference frequencies obtained using a fixed frequency oscillator present in a...
5179360 Transmitting/receiving apparatus switchable between digital and analog modulation modes  
Upon transmission, when the digital transmission mode is set, an analog audio signal is A/D converted, the digital audio signal is coded, a first carrier is modulated by the coded signal and...
5068918 Receiver for terrestrial AM and satellite FM-TV broadcasting signals  
A receiver for terrestrial AM-HF-TV signals and satellite FM-HF-TV signals in first and second frequency ranges, respectively, of mutually predominantly equal widths, which succeed each other in...
5020147 FM/AM broadcast signal converter  
A received modulated information signal is converted to an intermediate frequency (IF) signal from which modulating information may be recovered by supplying the modulated information signal to two...
5014349 Television tuner for common use in BS/UV  
The invention relates to a television receiving tuner for receiving television signals of VHF band/UHF band, a CATV signal, and a satellite television broadcasting signal. As a circuit for...
5005189 Detection of digital signals received from multipath channels  
Methods for detection or, or equivalently, demodulation of phase-and-amplitude-shift-keyed communication signals that may be received via multipath propagation or dispersion in a noisy channel are...
4881272 Multi-band FM receiver for receiving FM broadcasting signals and TV broadcasting sound signals  
A multi-band receiver for receiving broadcast signals divided by frequencies into an FM group and a TV group, the TV group including at least two different frequency ranges separated by a...
4607390 Squelch arrangement for AM/FM radio receiver  
A radio receiver has an IF amplifier whose output is connected to an AM demodulator and an FM demodulator. The noise level at the output of the FM demodulator is measured and, when it exceeds a...
4531234 Optimizing antenna interface for automobile radio receivers  
An automatic signal optimizing interface for connection between the antenna of an automobile radio receiver and the receiver itself processes the RF signal received by the antenna and provides an...
4380824 Receiving reproducing system  
A receiving reproducing system for an automotive radio detects the surrounding noise level other than the output sound thereof, in the sound field extending in the passenger compartment of an...
4380823 Multi-channel signal processing circuit formed in a semiconductor integrated circuit  
A semiconductor chip contains a multi-channel signal-processing circuit for processing signals in different frequency bands (e.g., an AM and an FM receiver). An inductor is coupled via an external...
4304004 Apparatus for transmission and reception of frequency modulated digital communication signals  
A system for the reception of digital communication signals which are modulated onto a carrier in the form of binary frequency modulation and in which the information losses occurring due to phase...
4255815 Electronic switching for AM-FM radio  
An integrated circuit, when operated from a simple single-pole-double throw switch, performs all of the functions required to switch modes in an FM-AM radio. The radio frequency circuits are...
4201946 AM-FM Detector circuit stabilized against fabrication and temperature variations  
A detector circuit for detecting AM and FM signals adapted particularly for integrated circuit fabrication which has a circuit configuration that provides highly stable operating characteristics...
4181890 Apparatus for receiving signals in plural frequency bands  
Radio receiving apparatus for receiving signals in plural frequency bands. Plural signal processing channels are provided, each channel being associated with a respective frequency band and each...
4177428 Circuit arrangement for amplifying oscillator oscillations and converting same to rectangular signals  
A circuit arrangement for digitally indicating the frequency to which an AM/FM radio receiver is tuned in which the oscillations of the AM and FM oscillators are amplified and converted to...
Matches 1 - 50 out of 79 1 2 >