Matches 1 - 50 out of 299 1 2 3 4 5 6 >
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7382257 Single RF oscillator single-side band modulation for RFID readers with frequency translation and filtering  
A transmitter shifts a baseband data signal having a bandwidth of 2ω M using a tone signal having a frequency ω M , which centers a sideband of the data signal at zero frequency. The transmitter...
7218898 Apparatus and method for frequency generation in mobile communication system  
An apparatus and method for generating an intermediate frequency (IF) to be transferred to a single sideband (SSB) generator which generates carriers using one local oscillator (LO) signal and at...
7184716 Low cost/low power analog transceiver architecture  
A time division duplex (TDD) single sideband (SSB) transceiver includes a transmitter adapted to input an analog audio signal, sample the analog audio signal, and to output an SSB frequency shift...
7177609 Chopper-direct-conversion (CDC) radio architecture  
A chopper-direct-conversion (CDC) radio receiver includes a phase-alternating mixer receiving an antenna input signal and at least one local oscillator signal and generating a double sideband...
7120397 All-frequency-band SSB radio communication system and radio apparatus  
An SSB radio communication system and radio apparatus applicable to ultra high frequencies such as a VHF band and UHF band. In the transmitting side, a carrier wave is amplitude modulated by...
7107022 Single RF oscillator single-side band modulation for RFID readers using tone insertion during reader reception  
A transmitter upconverts a SSB data signal during a first operational mode using a RF upconverting signal having a frequency that is offset from a center frequency of a channel (ω C ) by an amount...
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...
6891898 System and method for recovering symbol timing offset and carrier frequency error in an OFDM digital audio broadcast system  
The system for recovering symbol timing offset and carrier frequency error from an orthogonal frequency division multiplexed (OFDM) signal includes a receiver circuit for receiving an OFDM...
6889035 Cable-less interconnect architecture for effecting blind coupling of diplexer to radio transceiver  
An RF cable-less interconnect arrangement couples a diplexer to a radio transceiver by providing each of the transceiver and the diplexer by means of respective pairs of RF transmission and...
6844788 Polar loop transmitter  
A polar loop transmitter circuit arrangement includes a circuit input, a circuit output, a controllable signal source, a modulator connected between the signal source and the output, a first...
6795692 Method and apparatus for transmitting information by radio  
The invention provides an apparatus and procedure for radio transmission of information using a middle channel, a first side channel and a second side channel. The transmitted middle channel is...
6560293 Apparatus and method for FM remodulation of envelope modulated data signals  
An apparatus and method for transmitting envelope modulated data signals on a Radio Frequency (RF) carrier system, which produces high error performance through remodulation of the data signals...
6539063 System and method for recovering symbol timing offset and carrier frequency error in an OFDM digital audio broadcast system  
The system for recovering symbol timing offset and carrier frequency error from an orthogonal frequency division multiplexed (OFDM) signal includes a receiver circuit for receiving an OFDM...
6532270 Apparatus and method for broadcast band noise reduction in a transmitter with a low IF frequency  
In the broadcast band having a plurality of channels allocated therein, by using high-side injection and low-side injection as described herein, the noise introduced into the channel by the local...
6522213 SSB transmitter  
In an SSB transmitter, a problem such that the central frequency of a BPF for extracting one of sideband signals from the modulated signals obtained by modulating a carrier frequency signal by an...
6430401 Technique for effectively communicating multiple digital representations of a signal  
In a communications system implementing, e.g., an in-band on channel AM (IBOC-AM) (also known as “hybrid IBOC-AM”) scheme, multiple bit streams are used to represent an audio signal to be...
6418300 Method and device for transmitting mixed analog and digital signals by the same transmitter  
A process for transmitting mixed analog and digital signals. A composite signal is transmitted whose frequency spectrum is composed of a first analog spectrum representative of the amplitude of...
6351500 AM- compatible digital broadcasting method and system  
A method and system are provided for the transmission and reception of a composite radio-frequency (RF) signal including a supplemental signal, preferably representing encoded digital information,...
6178312 Mechanism for automatically tuning transceiver frequency synthesizer to frequency of transmit/receiver filter  
Frequency synthesizers of a radio transceiver are automatically tuned so that its transmit and receive frequencies correspond to whichever upper band and lower band filters the radio transceiver...
6167241 Technique for performing amplitude modulation without cheating side-bands  
A technique for amplitude modulating a carrier without producing side-bands is disclosed. In a preferred embodiment, a signal carrier is directly modulated and no energy side-bands are produced....
6148320 Multichannel digital signal generation method and apparatus  
A multichannel television access control system is disclosed wherein processing of the broadband signal is performed by gated coherent RF injection on a plurality of channels, thereby effecting...
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...
6078793 High precision controlled gain voice processing system and method  
A processing system (150) that generates a voice output signal having high precision controlled gain from a voice input signal by generating (225) a slow gain signal from the voice message by...
6005894 AM-compatible digital broadcasting method and system  
A method and system are provided for the transmission and reception of a composite radio-frequency (RF) signal including a supplemental signal, preferably representing encoded digital information,...
5924024 Method and circuit for achieving frequency conversion  
A frequency conversion method and a frequency conversion circuit which enlarge the frequency difference between the upper and lower sidebands of the output signal so as to enable the undesired...
5861781 Single sideband double quadrature modulator  
A method of and apparatus for effecting single sideband modulation which mixes and sums the quadrature and in-phase components of a baseband signal with the in-phase and quadrature components of an...
5825242 Modulator/demodulator using baseband filtering  
A modulation and demodulation scheme for video signals may be used for HDTV signals using VSB-PAM, analog NTSC signals using VSB-AM and digital video signals using QAM. VSB-PAM modulation and...
5822685 Modulating reflector circuit  
A modulating reflector circuit arrangement comprising a transistor configured by means of a feedback arrangement upon operation within a linear region of the transistor's current/voltage...
5815532 Method and apparatus for peak-to-average ratio control in an amplitude modulation paging transmitter  
A method and apparatus for reducing peak-to-average power ratio in a paging transmitter broadcasting an independent sideband amplitude modulation protocol is disclosed. A digital signal, for...
5745273 Device for single sideband modulation of an optical signal  
A single sideband modulator circuit for modulating an optical signal with an RF signal to provide a frequency shift to the optical signal. The modulator circuit utilizes a dual path modulator...
5694419 Shared resource modulator-demodulator circuits for use with vestigial sideband signals  
A common transceiver circuit for use as either a modulator or demodulator and that is implemented through a shared resource approach. This approach is particularly, though not exclusively, suited...
5506548 SSB modulator for adjusting the carrier amplitude level of a modulated SSB signal  
A Single-Sideband (SSB) modulator includes: a demultiplexer for successively distributing an A/D converted digital signal x(t) to L sequences x 1 (t 1 ), x 2 (t 2 )... ...x L (t L ) in...
5469127 Amplification apparatus and method including modulator component  
The present invention provides a system and method in which an arbitrary information-modulated signal is efficiently amplified to high power levels. The arbitrary information-modulated signal is...
5446423 Digital single sideband modulator and method  
A digital single sideband modulator (10) includes a relatively complex CMOS NCO (14) that drives a relatively simple ECL frequency translator (30). The frequency translator (30) outputs a digital...
5438686 Amplitude-modulated broadcast transmitter for various types of modulation, in particular DSB, SSB and ISB  
In an amplitude-modulated broadcast transmitter for various types of modulation, particularly DSB (double sideband), SSB (single sideband) and ISB (independent sideband), of at least one AF signal...
5416449 Modulator with harmonic mixers  
An improved modulator circuit for mixing a modulation signal with a carrier signal includes first and second harmonic mixers which are operative to produce modulated output signals at an output...
5394118 Digital circuit for the extraction of the phase and envelope signals of a single sideband signal  
A digital circuit having a first section for converting a low-frequency signal into a sampled single sideband signal, coupled to a second section for separating the sampled SSB signal into its two...
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...
5243304 Vestigial sideband modulator for a baseband input signal  
In a vestigial sideband modulator, an i.f. signal is modulated with a video input and the extreme part of one of the sidebands is removed to provide the right frequency response shape for...
5222250 Single sideband radio signal processing system  
A single sideband radio system. The system comprises a transmitter and a receiver. The transmitter comprises a transmitter baseband processing portion for generating a first baseband signal...
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...
5172231 S-band video signal transmitter  
An S-Band video transmitter includes a modulator, an up converter for converting the modulated signals to a preselected S-band, and transmit circuitry for transmit circuitry for transmitting the RF...
5172079 Balanced modulator designed for low supply voltage  
A balanced modulation circuit includes first, second, and third differential amplifiers. The first differential amplifier includes first and second transistors (Q11, Q12) having the emitters...
5162763 Single sideband modulator for translating baseband signals to radio frequency in single stage  
A single sideband modulator provides a means of translating low frequency baseband signals directly to radio frequency in a single stage. Such modulators, providing suppressed carrier and one or...
5159613 Side-band generator  
An upper and lower side-band generator comprised of a combination of combinational logic circuits. In a preferred embodiment the invention utilizes a substantially square wave sync output...
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...
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...
5020133 Phase/frequency modulator  
Phase or frequency modulators which utilize phase generators rather than se shifters to produce low frequency input voltages to single side band modulators. Two phase generators are used to supply...
4974236 Arrangement for generating an SSB signal  
An SSB generator in which a digitized analogue signal is processed in accordance with Weaver's method. The baseband I and Q signals are interpolated at a sampling frequency f s in respective first...
Matches 1 - 50 out of 299 1 2 3 4 5 6 >