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8130833 |
VSB transmission system for processing supplemental transmission data
A VSB communication system or transmitter for processing supplemental data packets with MPEG-II data packets includes a VSB supplemental data processor and a VSB transmission system. The VSB...
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8107899 |
Power supply circuit
Provided is a power supply circuit capable of operating with low noise and low power consumption. In a power supply circuit, a power level control signal Pa for controlling a power level of a power...
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8099065 |
Transmitting apparatus and method
Communication with less noise is to be performed. A voltage value control signal functioning as an instruction to change the voltage value supplied from a voltage converting section to an LFI is...
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8094764 |
Variable time delay control structure for channel matching
A cosite interference cancellation system is provided for improved rejection of a signal coupled from a transmission antenna into a local receive antenna in the presence of local multipath. The...
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8060027 |
RF transmission leakage mitigator, method of mitigating an RF transmission leakage and CDMA transceiver employing the same
The present invention provides an RF transmission leakage mitigator for use with a full-duplex, wireless transceiver. In one embodiment, the RF transmission leakage mitigator includes an inversion...
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8059718 |
VSB transmission system for processing supplemental transmission data
A VSB communication system or transmitter for processing supplemental data packets with MPEG-II data packets includes a VSB supplemental data processor and a VSB transmission system. The VSB...
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7983630 |
Digital IF wireless transmitter, RF modulator, and RF modulating method
Provided are a digital IF wireless transmitter, an RF modulator, and an RF modulating method. A digital IF wireless transmitter includes an IF up-converting unit up-converting a baseband I signal...
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7893787 |
DC offset cancellation circuit for modulator using 1-bit signal conversion
A DC offset cancellation circuit used for compensating a carrier leak at an output signal of a modulator has a sign extraction unit for extracting sign of an information signal which is applied to...
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7856048 |
On-chip IQ imbalance and LO leakage calibration for transceivers
The disclosure can provide methods and systems for autocalibrating a transceiver. The method can include upconverting a bandpass input signal by mixing the bandpass input signal with a first local...
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7848453 |
Independent LO IQ tuning for improved image rejection
A transmitter includes a first amplifier to amplify an in-phase oscillator signal to produce an in-phase mixing signal and a second amplifier to amplify a quadrature-phase oscillator signal to...
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7805124 |
Low-loss frequency pattern generator
Frequency pattern generator (1, 101, 201) for generating frequency pulses, said generator having a first local oscillator unit (2-1, 121, 221) for generating a first radio frequency carrier...
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7668249 |
Oversampling rate converter with timing control for a digital radio frequency transmitter modulator
The present invention includes a digital quadrature rate converter and an oversampling interpolator, which are used to receive digital quadrature modulation data at one clock rate and to provide...
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7616688 |
VSB transmission system for processing supplemental transmission data
A VSB communication system or transmitter for processing supplemental data packets with MPEG-II data-packets includes a VSB supplemental data processor and a VSB transmission system. The VSB...
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7580694 |
Contactless integrated circuit with high-efficiency electrical power supply circuit
A circuit and method for supplying an electronic circuit with a direct supply voltage using high frequency antenna signals. The method includes producing a primary direct voltage equal to a...
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7570127 |
Method and system for spur suppression in modulators
An IF receiver receives a tapped portion of a modulated communication signal. A processor, local with respect to the IF receiver, receives an interrupt from a main processor instructing it to...
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7555271 |
Single side band transmissions
A method for single side band transmissions begins by mixing, in a current domain, an in-phase component of outbound formatted data with an in-phase component of a local oscillation to produce a...
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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 2ωM using a tone signal having a frequency ωM, which centers a sideband of the data signal at zero frequency. The transmitter t...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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 tra...
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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...
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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,...
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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...
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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....
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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 x1 (t1), x2 (t2)... ...xL (tL) in accordance with a...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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