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790results about "Duration/width modulated pulse demodulation" patented technology
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Method for software driven generation of multiple simultaneous high speed pulse width modulated signals
InactiveUS7113541B1Electroluminescent light sourcesVoltage-current phase angleTime segmentControl signal
Systems and methods can provide, in one aspect, a method for modulating the pulse width of control signals generated on a plurality of separate channels. In one practice, the methods described herein are suitable for execution on a microprocessor or micro controller platform that includes a timer interrupt mechanism which will generate an interrupt in response to a timer counting down a selected time interval or time period. In one practice, the timer is set to count down a period of time that is representative of a portion, or sub period, of the PWM cycle. Upon expiration of that time period, the timer executes an interrupt that causes the micro controller to enter an interrupt service routine (ISR) that can further modulate the PWM cycle of one or more signals.
Owner:PHILIPS SOLID STATE LIGHTING SOLUTIONS
Multiple-channel transmission over a single-wire bus
ActiveUS8509318B2Batteries circuit arrangementsTransmission/receiving by adding signal to waveTransmission channelPower over
Apparatus and methods are described that enable concurrent transmission of multiple data signals including clock, synchronization, and power over a single-wire bus between a master device and one or more slave devices. A first transmission channel from the master device to the slave device may modulate the width of periodic pulses between a first voltage level and a second voltage level with respect to a reference potential. A second transmission channel may modulate the amplitude of at least one of the first and second voltage levels to at least one third voltage level. Concurrent communications between a master device and one or more slave devices over a single-wire bus can be achieved.
Owner:STMICROELECTRONICS (ROUSSET) SAS
System and method for remote optical digital networking of computing devices
InactiveUS6920289B2Widely distributedIncrease rangeElectric signal transmission systemsFrequency/rate-modulated pulse demodulationData transmissionMobile device
This invention extends the range of optical data of mobile device by trading speed for distance as well as integrating a plurality of pulses over time to define a single bit of information. The present invention uses a number of integrated pulses to represent a single bit instead of utilizing a one to one correspondence between pulses and bits. The present invention executes a range extender application which executes on the mobile device without any hardware modification to the mobile device. The range extender application causes the optical transmitter to “stutter” or repetitively emanate the identical pulse representing a bit of information. Sufficient photons are thereby gathered at a receiver to reach a predetermined threshold. A tradeoff of the data transmission frequency in this invention is that a signal intensity drops by a factor of 100 when distance increases by a factor of 10 yielding a distance / intensity ratio of {fraction (1 / 10)}.
Owner:GLOBALFOUNDRIES US INC
Transmitter circuit, receiver circuit, clock data recovery phase locked loop circuit, data transfer method and data transfer system
ActiveUS20050286643A1Reduce errorsData transmission is stableTelevision system detailsFrequency/rate-modulated pulse demodulationDigital dataPhase locked loop circuit
[Problems] To realize a reliable and stable transfer of digital data that does not require a reference clock and a handshake operation. [Means for Solving the Problem] The present invention provides a digital data transfer method for alternately and periodically transferring first information and second information respectively in a first period and in a second period, wherein: an amount of information of the first information per unit time in the first period is greater than an amount of information of the second information per unit time in the second period; and the second information in the first period is transferred as pulse-width-modulated serial data.
Owner:THINE ELECTRONICS
Time domain symbols
ActiveUS8848808B2Modulated-carrier systemsDuration/width modulated pulse demodulationTime domainElectrical and Electronics engineering
Methods and apparatus are described for time domain signals. A method includes creating a bipolar pulse whose high (up) and low (down) periods are separately and precisely controllable.
Owner:LIGHTFLEET CORP
Transmitter circuit, receiver circuit, clock data recovery phase locked loop circuit, data transfer method and data transfer system
ActiveUS7535957B2Reduce errorsData transmission is stableTelevision system detailsFrequency/rate-modulated pulse demodulationDigital dataPhase locked loop circuit
[Problems] To realize a reliable and stable transfer of digital data that does not require a reference clock and a handshake operation.[Means for Solving the Problem] The present invention provides a digital data transfer method for alternately and periodically transferring first information and second information respectively in a first period and in a second period, wherein: an amount of information of the first information per unit time in the first period is greater than an amount of information of the second information per unit time in the second period; and the second information in the first period is transferred as pulse-width-modulated serial data.
Owner:THINE ELECTRONICS
Power transmitter and wireless power transmission system
ActiveUS20120063505A1Stable wireless power transmissionStable power deliveryMicrophonesElectrical transducersElectric power transmissionTransmitted power
A power transmitter 50 is usable in a wireless power transmission system for transmitting power wirelessly. The power transmitter 50 includes a power transmitting section 51 for transmitting power; a communication section 52 for communicating information, for controlling the transmission of the power, with the power receiver 60; and a control section 53 for controlling the power transmitting section 51 such that the power to be sent out by the power transmitting section 51 is higher while the communication section 52 is performing the communication.
Owner:PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
Ultra-wideband pulse modulation system and method
InactiveUS7190722B2Available bandwidth of communicationIncrease powerFrequency/rate-modulated pulse demodulationIndividual digits conversionUltra-widebandFiber
An ultra-wideband pulse modulation system and method is provided. One method of the present invention includes transforming data into a ternary data set with data being represented with states of zero, positive one and negative one. The modulation and pulse transmission method of the present invention enables the simultaneous coexistence of the ultra-wideband pulses with conventional carrier-wave signals. The present invention may be used in wireless and wired communication networks such as hybrid fiber-coax networks. This Abstract is provided for the sole purpose of complying with the Abstract requirement rules that allow a reader to quickly ascertain the subject matter of the disclosure contained herein. This Abstract is submitted with the explicit understanding that it will not be used to interpret or to limit the scope or the meaning of the claims.
Owner:INTELLECTUAL VENTURES HLDG 73
Apparatus and method for envelope tracking power amplifier in wireless communication system
ActiveUS20110058601A1Enhanced signalPulse automatic controlModulated-carrier systemsCommunications systemAudio power amplifier
An apparatus and method for amplifying a Transmit (Tx) signal according to an Envelope Tacking (ET) scheme in a wireless communication system are provided. A transmitting end apparatus includes an envelope gain controller for controlling a gain of a digital baseband Tx signal in accordance with power control, a detector for detecting an envelope signal from the digital baseband Tx signal whose gain is controlled, and for shaping on the envelope signal, a first Digital to Analog Converter (DAC) for converting the shaped envelope signal into an analog signal, and an envelope modulator for generating a drain bias of a power amplifier that amplifies a Radio Frequency (RF) Tx signal by using the analog envelope signal. Accordingly, a digital-based ET scheme is implemented, and by using a plurality of shaping tables, efficiency of the ET scheme can be maximized in a transmitting end that uses power control.
Owner:SAMSUNG ELECTRONICS CO LTD
Two wire communication system
InactiveUS6459363B1Without loss of data transmission timeElectric signal transmission systemsTransmission/receiving by adding signal to waveElectric power transmissionElectrical conductor
A two wire communication system capable of transmitting data and transferring power by the used of an electrical bi-polar waveform across a two wire conductor from a controller in communication with the two-wire conductor to at least one module in communication with the controller and capable of transmitting data from the module to the controller; and a remote electrical device in communication with the controller. Usable data may be continuously transmitted across the two wire conductor independent of and during power transmission between the controller and the at least one module without loss of data transmission time and without affecting the transfer of power to the at least one module. The data is transmitted across the two wire conductor to the modules by pulse duration signals at the same time power is transmitted to the modules. The system is capable of using up to 100% of transmission time to transmit data without affecting transfer of power to the at least one module.
Owner:AMPCONTROL PTY LTD
Burst transmission
ActiveUS20060245488A1Pulse modulation television signal transmissionError preventionBurst transmissionMultiprotocol Encapsulation
A terrestrial digital video broadcasting (DVB-T) network is used to transmit IP datagrams to receiving devices using multiprotocol encapsulation (MPE). MPE datagram section and, if forward error correction (FEC) is used, MPE-FEC datagram sections may include time-slicing parameters, such as a “delta-t” parameter for specifying a time until the next burst is transmitted and a flag for indicating the end of a burst. Thus, MPE and MPE-FEC datagram sections can be transmitted in bursts. Other types of sections, however, do not include such time-slicing parameters and thus cannot usually be transmitted in bursts. Nevertheless, by assembling a burst including at least one MPE or MPE-FEC datagram section which specifies delta-t and MPE or MPE-FEC datagram section at the end of a burst which indicates its position, other types of sections can benefit from being transmitted in bursts.
Owner:HTC CORP
Self-referencing communication in implantable devices
InactiveUS8055345B2Convenient treatmentReliable information transmissionElectrotherapyDuration/width modulated pulse demodulationEngineeringSelf-clocking signal
Various aspects of the present invention enable robust, reliable control functionality for effectors present on intraluminal, e.g., vascular leads, as well as other types of implantable devices. Aspects of the invention include implantable integrated circuits that have self-referencing and self-clocking signal encoding, and are capable of bidirectional communication. Also provided by the invention are effector assemblies that include the integrated circuits, as well as implantable medical devices, e.g., pulse generators that include the same, as well as systems and kits thereof and methods of using the same, e.g., in pacing applications, including cardiac resynchronization therapy (CRT) applications.
Owner:PROTEUS DIGITAL HEALTH INC
Power reception control device, power transmission control device, non-contact power transmission system, power reception device, power transmission device, and electronic instrument
ActiveUS20080200119A1Resonant long antennasNear-field transmissionElectric power transmissionTransport system
A power-receiving-side control circuit of a power reception device performs intermittent load modulation by causing an NMOS transistor to be turned ON / OFF during normal power transmission. A power-transmission-side control circuit included in a power transmission control device of a power transmission device monitors, an intermittent change in the load of the power reception device during normal power transmission. The power-transmission-side control circuit determines that a foreign object has been inserted between a primary coil and a secondary coil and stops power transmission when an intermittent change in load cannot be detected. The amount of power supplied to the load may be compulsorily reduced when the load state of the load is heavy.
Owner:SEIKO EPSON CORP +1
Apparatus and method for converting analog signal to pulse-width-modulated signal
InactiveUS6970503B1Analogue/digital conversionElectric signal transmission systemsAudio power amplifierEngineering
Owner:NAT SEMICON CORP
Method and apparatus for encoding/decoding using extended macro-block skip mode
InactiveUS20070230575A1Possible to predictColor television with pulse code modulationColor television with bandwidth reductionComputer hardwareSyntax
A method is provided for encoding a multi-layer video signal by using an extended macro-block skip mode. The method includes generating a bit stream of a base layer; generating a bit stream of an enhanced layer by referring to a frame of the base layer; setting a syntax item for an extended macro-block skip mode in an area of the bit stream of the enhanced layer, wherein the syntax item indicates if information of the base layer is used as it is while a frame of the enhanced layer is skipped.
Owner:SAMSUNG ELECTRONICS CO LTD
Inverter control apparatus and inverter control method
InactiveUS20050174076A1Reliable resultsHighly reliable judgment resultAC motor controlSynchronous motors starters
An interrupt signal is generated at each of rising timings of PWM signals which are produced on the basis of phase-shifted triangular wave carrier signals for phases, and voltage command values for the phases. At timings of the interrupt signals, A / D conversion of motor currents of the phases detected by a shunt is started. Interrupt signals are also produced at timings of valleys of the triangular wave carrier signals. Additionally, peak interrupt signals and valley interrupt signals are respectively produced at timings of peaks and valleys of triangular wave carrier signals for phases. Based on each of the peak interrupt signals, normality / abnormality of a switching element of an upper side of the phase corresponding to the interrupt signal is checked, and, based on each of the valley interrupt signals, normality / abnormality of a switching element of a lower side of the phase corresponding to the interrupt signal is checked.
Owner:NIPPON YUSOKI
Detection of DC output levels from a class D amplifier
ActiveUS7078964B2Simple analog portionLow cutoff frequencyDuration/width modulated pulse demodulationPulse duration/width modulationUnsafe conditionAudio power amplifier
Owner:TEXAS INSTR INC
Template pulse generating circuit, communication device, and communication method
ActiveUS20080205559A1Reduce power consumptionDuration/width modulated pulse demodulationAmplitude-modulated carrier systemsControl signalEngineering
A template pulse generating circuit that generates a template pulse used for detection of a received pulse in pulse communication includes an output mode switching circuit for switching an output mode in accordance with a supplied control signal between a continuous output mode that continuously outputs the template pulses and an intermittent output mode that intermittently outputs the template pulses so that the template pulse is generated in either one of the continuous output mode and the intermittent output mode.
Owner:138 EAST LCD ADVANCEMENTS LTD
Detection of DC output levels from a class D amplifier
ActiveUS20050083116A1Simple analog portionLow cutoff frequencyDuration/width modulated pulse demodulationPulse duration/width modulationUnsafe conditionAudio power amplifier
A class AD audio amplifier system (10) with DC output detection logic (26) is disclosed. The amplifier system (10) includes multiple audio channels (20), each of which includes a pulse-width-modulator (PWM) (24). The DC detection logic (26) includes a sigma-delta modulator (60) and a digital low-pass filter (62) that monitors the PWM output signals from the PWM modulators (24). The sigma-delta modulator (60) operates at a first clock frequency, while the low-pass filter (62) operates at a much lower clock frequency, so that AC audio components, PWM harmonics, and sigma-delta quantization error is suppressed from the DC detection. The modulated filtered signal is compared against a threshold level (THRSH) to determine whether the amplitude of a DC component at the PWM output is sufficiently high to constitute a fault. If so, a fault detection signal (DC_DET) is issued, and the PWM modulators (24) are disabled to prevent unsafe conditions in the system (10).
Owner:TEXAS INSTR INC
Digital Controller Based Power Factor Correction Circuit
InactiveUS20070036212A1TransistorEfficient power electronics conversionA d converterVoltage reference
A power factor correction circuit utilizes a digital controller string comprised of an analog-to-digital converter, which is input to a digital compensator followed by a pulse width modulation circuit for generating a switching pulse. The loop current in a regulator circuit such as a boost regulator is sensed and input to one side of a differential analog-to-digital converter, the other side thereof providing a digital reference current. This digital reference current is derived from comparing the input AC voltage to the regulator with the DC output voltage and processing these two voltages with a PFC algorithm to provide this reference voltage.
Owner:SILICON LAB INC
System and method for transmission of combined data stream
ActiveUS20090069801A1Modulated-carrier systemsFrequency/rate-modulated pulse demodulationElectricityData stream
An electrosurgical system is disclosed. The electrosurgical system includes an electrosurgical instrument configured to generate a first and second data streams and a transmission circuit configured to convert the first and second data streams into a pulsed transmission signal. The first signal property of the transmission signal is representative of the first data stream and the second signal property of the transmission signal is representative of the second data stream. The transmission circuit is further configured to process the transmission signal to decode the first signal property into the first data stream and the second signal property into the second data stream.
Owner:TYCO HEALTHCARE GRP LP
Method and system for a generation of a two-level signal
InactiveUS6975177B2Improve linearityImprove power efficiencyModulation with suppressed carrierFrequency/rate-modulated pulse demodulationAudio power amplifierControl signal
In a modulation system, in order to provide a two-level signal with a desired modulation which is suited to be amplified by a switching mode power amplifier, the modulation system may include a first constant envelope modulator modulating a signal according to a first control signal, a second constant envelope modulator modulating a signal according to a second control signal, and a combining portion combining the output signal of the first and said second constant envelope modulator to a single, two-level pulse-width-modulated signal. The information which is to be represented by the modulation of the single, two-level pulse-width-modulated signal is coded in the first and the second control signals. The invention relates equally to a corresponding method for generating a modulated signal.
Owner:NOKIA CORP
Communication system and method, and distributed control system and method
InactiveUS20070088883A1Low costAccurate communicationSuspensionsElectrical controlCommunications systemTime segment
A communication system performs bidirectional communication through a same communication path every communication cycle period between a master station and a slave station. From the start of the communication cycle period until an interval period shorter than the communication cycle period elapses, the master station transmits master data represented at a first ratio of first pulse width to the communication cycle period to the slave station. In a remaining period after the interval period in the communication cycle period, the slave station transmits slave data represented at a second ratio of second pulse width to the interval period to the master station.
Owner:DENSO CORP
Pwm controller with output current limitation
InactiveUS20090021233A1Reduce electricity costsCurrent is limitedDc-dc conversionDuration/width modulated pulse demodulationCurrent limitingEngineering
A PWM controller with output current limitation makes the over-current limitations almost the same even though the input voltages are different. The designer does not need to use high specification components or add an output current limiting circuit against the over-current condition. Costs are reduced and the layout is simplified. The switch power supply includes a transformer, a power switch, a first detecting circuit for generating a first detecting signal, a second detecting circuit for generating a second detecting signal, and a controller. The transformer converts the power and outputs the power to the secondary side. The power switch has a first terminal, a second terminal, and a controlled terminal. The controller has a control terminal, a first detecting terminal for receiving the first detecting signal, and a second detecting terminal for receiving the second detecting signal. The controller performs a protecting operation according to the received signals.
Owner:NIKO SEMICON
Carrier synchronization to reduce common mode voltage in an AC drive
A method and apparatus for use with a power conversion configuration including a pulse width modulated (PWM) converter, a PWM inverter and master and slave carrier signal generators wherein the master and slave carrier signal generators receive master and slave PWM frequency signals and generate master and slave carrier signals as a function thereof, PWM signals for controlling the converter and the inverter derived by comparing converter and inverter modulating waveforms to converter and inverter carrier signals, respectively, the method comprising the steps of identifying a phase difference between the master and slave carrier signals, using the phase difference to modify subsequent slave carrier signals to substantially conform the slave carrier signal frequency and phase to the master carrier signal frequency and phase and using the master carrier signal and the modified slave carrier signal to generate control signals for the converter and the inverter.
Owner:ROCKWELL AUTOMATION TECH
Method and apparatus for dynamic modulation
InactiveUS8085106B2Angle modulation detailsFrequency/rate-modulated pulse demodulationFrequency spectrumHarmonic
Circuits and methods of dynamic modulation are disclosed. A dynamic modulator is used to reduce measurable conducted and / or radiated electromagnetic interference (EMI). The dynamic modulator is configured to generate either a set of optimal frequency modulation depths or discrete frequencies or both, and dynamically selects them to use over a series of programmable time durations (dwell time). Together with the utilization of Peak, Average or Quasi-Peak (QP) method of measurement, the dynamic modulator can reduce the spectral amplitude of EMI components, in particular the lower harmonics, to effectively pass regulatory requirements. In alternative embodiments, the dynamic modulator is used in a closed loop system to continuously adjust the frequency and the duty cycle of a PWM signal to reduce conducted and / or radiated EMI.
Owner:HUDA MUZAHID BIN +1
DTV transmitter and method of coding data in DTV transmitter
ActiveUS8094727B2Improve reception performanceData representation error detection/correctionPulse modulation television signal transmissionTime informationMultiplexing
A DTV transmitter includes an encapsulation unit which encapsulates enhanced data having an internet protocol (IP) format into a plurality of addressable sections. The encapsulation unit inserts burst time information into each addressable section. The DTV transmitter further includes a first multiplexer multiplexing the encapsulated enhanced data with program and system information, a pre-processor pre-processing the multiplexed enhanced data, a data formatter generating enhanced data packets including the pre-processed data and inserting the known data into the enhanced data packets, and a second multiplexer generating one or more bursts of data by multiplexing the enhanced data packets.
Owner:LG ELECTRONICS INC
Inverter control apparatus and inverter control method
InactiveUS7049778B2Reliable resultsSynchronous motors startersAC motor controlPower inverterPhase shifted
An interrupt signal is generated at each of rising timings of PWM signals which are produced on the basis of phase-shifted triangular wave carrier signals for phases, and voltage command values for the phases. At timings of the interrupt signals, A / D conversion of motor currents of the phases detected by a shunt is started. Interrupt signals are also produced at timings of valleys of the triangular wave carrier signals. Additionally, peak interrupt signals and valley interrupt signals are respectively produced at timings of peaks and valleys of triangular wave carrier signals for phases. Based on each of the peak interrupt signals, normality / abnormality of a switching element of an upper side of the phase corresponding to the interrupt signal is checked, and, based on each of the valley interrupt signals, normality / abnormality of a switching element of a lower side of the phase corresponding to the interrupt signal is checked.
Owner:NIPPON YUSOKI
Circuit and method for pulse width modulation
InactiveUS7391280B2Improve audio qualityReduce clock frequencyDuration/width modulated pulse demodulationPulse duration/width modulationElectromagnetic interferencePulse-code modulation
A circuit and a method for performing pulse width modulation are provided. A pulse density modulator (PDM) is applied to receive the least N bits of the input data and to generate a pulse density modulation signal. The number of pulse of the pulse density modulation signal in 2^N frames correspond to a value of the least N bits of the input data. An adder is applied to generate a PWM data by adding a value of the most M bits of the input data to a value of the pulse density modulation signal generated by the PDM. A pulse width modulator is applied to generate a PWM signal dithering in 2^N frames according to the PWM data generated by the adder, so as to improve the audio quality of pulse width modulation and the Electro-Magnetic Interference (EMI) phenomenon.
Owner:SUNPLUS TECH CO LTD
Multiple-channel transmission over a single-wire bus
ActiveUS20110150065A1Improve transfer rateBatteries circuit arrangementsTransmission/receiving by adding signal to waveData signalTransmission channel
A method for transmitting at least a synchronization and a data signal on a single-wire bus between a master device and at least one slave device, wherein a first transmission channel from the master device to the slave device modulates the periodic pulse width between a first level and second level of a same sign voltage relative to a reference potential, and a second transmission channel amplitude modulates at least one of the voltage levels between the level and at least one third level different from the two others and from the reference potential.
Owner:STMICROELECTRONICS (ROUSSET) SAS
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