Abstract: A local oscillator of the present invention includes: a frequency generator for outputting first and second sinusoidal signals having the same frequency but mutually different phases; a phase detector for outputting either a positive or a negative voltage depending on whether a phase difference between the first and second sinusoidal signals output from the frequency generator is greater than a reference phase difference; and a comparator for outputting a comparison result between a voltage output from the phase detector and a reference voltage, or a comparison result between the voltage output from the phase detector and a voltage obtained by inverting the polarity of the voltage, in which the frequency generator controls the phase of the first sinusoidal signal so that the phase difference approaches the reference phase difference by using the comparison result output from the comparator, enabling generating IQ signals having higher phase accuracy than conventional local oscillators.
Abstract: The method: extracts symbols at pilot positions from the received stream of symbols, estimates noise variances at pilot positions, determines a rough channel estimation from the symbols extracted at pilot positions, determines weighting coefficients from the estimated noise variances, weights the rough channel estimation by the determined weighting coefficients, filters the weighted rough channel estimation using predetermined coefficients, at least one predetermined coefficient being different from the other predetermined coefficients, the predetermined coefficients being determined for a constant noise variance, determines normalization coefficients from the determined weighting coefficients and predetermined filter coefficients, normalizes the filtered weighted rough channel estimation using the determined normalization coefficients.
Abstract: When arranging a reference signal generated by a pseudorandom number on specified time and frequency, an information processing unit (101) determines whether or not to arrange a 1 OFDM symbol or 2 OFDM symbols including a reference signal at a position determined in each slot, and determines whether or not to additionally arrange an OFDM symbol including a reference signal in the same slot. A multiplexing unit (108) performs multiplexing of a reference signal in accordance with the determination by the information processing unit (101).
Abstract: The rectifying device converts high-frequency power input from an input terminal into direct current power and outputs the direct current power from an output terminal. The rectifying device includes a rectifier that converts the high-frequency power into the direct current power, and an impedance changer having one end connected to a connection point of the rectifier and the output terminal and the other end to which reference voltage is applied such that impedance varies while having a negative correlation with respect to an absolute value of voltage of the direct current power. When the absolute value of the voltage of the direct current power is greater than a predetermined value that is lower than reverse withstand voltage of the rectifying element included in the rectifier, the impedance of the impedance changer as viewed from the rectifier is a value regarded as corresponding to a short circuit.
Abstract: An out-of-vehicle communication device includes: a yielding-intention-judgment-parameter learning unit that generates a yielding intention judgment parameter as learning data in which behavior and a position of a pedestrian are associated with the condition of the yielding intention of the pedestrian, and stores the yielding intention judgment parameter in a storage unit; a yielding intention judgment unit that judges yielding intention of an actual pedestrian based on a head image and a position of the actual pedestrian and the yielding intention judgment parameter stored in the storage unit; and a display control unit that determines whether or not to display display content to the actual pedestrian, contents of the display content, and a display position of the display content on a road based on result of the judgment on the actual condition of the yielding intention of the pedestrian and controls a display device based on the determination.
Abstract: The method: determines, within the switching cycle, when current is not provided to the DC-bus capacitor, determines, for each switching cycle, the sector of a reference vector, active vectors durations and null voltage vectors durations, determines from the determined durations, sampling instants, samples the currents through the three phases and the DC-bus voltage at the determined sampling instants, determines, from the phase currents sampled at the determined sampling instants, the current flowing through the DC-bus capacitor during the active vectors, estimates the capacitance value and/or the equivalent series resistance value of the DC-bus capacitor, compares the capacitance value and/or the equivalent series resistance value to a threshold and determines if the DC-bus capacitor reaches its end of life according to the comparison result.
Abstract: A power semiconductor device includes a substrate and a semiconductor element bonded onto a first surface of the substrate through use of a sintered metal bonding material. The substrate has a plurality of dimples formed in the first surface and located outside a location immediately below a heat generation unit of the semiconductor element. The sintered metal bonding material is supplied onto the substrate after the formation of the dimples, and the semiconductor element is bonded to the substrate through application of heat and a pressure thereto.
Abstract: In a movable portion state being a state of a print movable portion including a roll core holder unit configured to support one end portion and another end portion of a roll core, there exist an open state and a closed state. The print movable portion is configured to be movable so that the movable portion state is the open state or the closed state. The roll core holder unit is provided with a support portion. In a support state in which the support portion supports the one end portion and the another end portion, as the movable portion state transitions from the open state to the closed state, a first fitting portion fits into the one end portion and a second fitting portion fits into the another end portion.
Abstract: In a display control device (10), an acquisition unit (21) acquires a value of a signal outputted from an apparatus (60) during execution of a control program (52) which controls the apparatus (60). A control unit (22) controls a display device (30) to display a code of the control program (52) on a screen (54), and to display the value of the signal acquired by the acquisition unit (21), on a portion in the code of the control program (52) which corresponds to the signal, in a format that enables distinction of a state of the apparatus (60) of the time the value of the signal is outputted.
Abstract: An optical communication device includes a conversion unit that receives an optical signal transmitted from a first optical communication device and converts the optical signal into a digital electric signal based on a clock signal, a clock switching unit that switches an oscillator generating the clock signal, and an operation mode control unit that detects an operation mode of the first optical communication device in the digital electric signal and commands the clock switching unit to perform switching from the oscillator generating the clock signal to an oscillator generating a clock signal at a frequency based on the operation mode of the first optical communication device.
Abstract: In a display apparatus of the present invention, an extension of a rear frame and an extension of a front frame are combined to oppose each other, so that structures (the extensions) having high stiffness are disposed on side surfaces of the display apparatus opposing each other. With an increase in stiffness of the display apparatus including the rear frame and the front frame, the display apparatus as a whole is less likely to be deformed by an external force.
Abstract: The object is to provide a technique that can prevent cracks from appearing in an undesirable portion in a resin. A semiconductor device includes an electronic circuit including a semiconductor element, a metal electrode directly connected to the electronic circuit, and an encapsulation resin. The encapsulation resin encapsulates the electronic circuit and the metal electrode. An end portion of the metal electrode on a surface opposite to a surface facing the electronic circuit is acute-shaped, and an end portion of the metal electrode on the surface facing the electronic circuit is arc-shaped or obtuse-shaped.
Abstract: An ultrasonic probe (1) sends out ultrasound waves to a steel sheet (100) obliquely at a plurality of angles, using transmission signals provided from a transmission signal processing unit (3a). In addition, the ultrasonic probe (1) receives echoes corresponding to the plurality of angles from the steel sheet (100). A reception signal processing unit (3b) determines amplitudes of the echoes received by the ultrasonic probe (1) and corresponding to the plurality of angles, and periods of time from when the ultrasound waves are sent out until the echoes are received, as reception times, and identifies a location of a flaw (101) in the steel sheet (100) from the reception times and a ratio between the amplitudes.
Abstract: An internal-combustion engine starting device includes a switch section, a motor section, a transmission mechanism section, and a pinion gear section, wherein the transmission mechanism section is configured of a planetary gear train including a pinion which is connected to the rotating shaft of the motor section, a plurality of planetary gears to which the rotation of the pinion is transmitted, and an internal gear which receives the rotation of the planetary gears; and of a machine casing in which is housed the planetary gear train, and wherein elastic bodies are each fitted between a protruding portion formed on the outer peripheral surface of the internal gear and a recessed portion in which to receive the protruding portion, and clearances are formed between the internal gear and the machine casing via the elastic bodies.
Abstract: Provided is a segment-core coupled body, including a plurality of segment cores each including a core back and a tooth; and a plurality of coupling portions configured to couple the core backs to one another, wherein the plurality of segment cores and the plurality of coupling portions are each a laminated body of magnetic sheets, wherein the plurality of coupling portions each include: a posture holding portion adjacent to a gap defined between adjacent core backs; a first thin portion configured to couple one corner portion of the adjacent core backs and the posture holding portion; and a second thin portion configured to couple another corner portion of the adjacent core backs and the posture holding portion, and wherein, the posture holding portion projects toward a radially outer side with respect to the adjacent core backs.
Abstract: An object of the invention is to provide the semiconductor module which can predict a life precisely, and the life prediction system for the semiconductor module. The semiconductor module according to the present invention includes IGBTs, diodes, measurement circuits for measuring characteristics of the IGBTs and the diodes, and a memory for storing initial values of predetermined characteristics of the IGBTs and the diodes, measured values of characteristics of the IGBTs and the diodes measured by measurement circuits, and a predetermined determination value for characteristic degradation of the IGBTs and the diodes.
Abstract: An electric power steering device of a steer-by-wire type includes: a steering input mechanism, which includes a steering wheel to be operated by a driver; a reaction force motor, which is configured to apply a steering reaction force to the steering wheel; a steering motor, which is configured to output a steering force; a steering mechanism, which is prevented from being mechanically connected to the steering input mechanism, and is configured to steer a steered wheel through the steering force generated by the steering motor; and a drive control device, which is configured to carry out drive control for the steering motor and the reaction force motor. At least one of the steering motor or the reaction force motor is constructed of a double-winding motor of a double-inverter type in which each of windings is duplexed, and the respective duplexed windings are individually driven by two inverters.
Abstract: An air-conditioning apparatus includes a refrigeration circuit, a first shut-off device, a leakage detection device, and a controller configured to perform a refrigerant recovery operation in a case where refrigerant leakage is detected. At the time of the refrigerant recovery operation, the controller performs control to perform a first operation of recovering refrigerant from a load-side heat exchanger into an accumulator and a heat-source-side heat exchanger, and a second operation of moving refrigerant in the heat-source-side heat exchanger to the accumulator. In the first operation, the first shut-off device is closed, a flow passage switching device is brought into a first connection state, and a compressor is driven. The second operation is performed after the first operation, and in the second operation, the connection state of the flow passage switching device is switched to a second connection state in a state where the compressor is being operated.
October 5, 2017
August 6, 2020
Mitsubishi Electric Corporation
Jun NISHIO, Soshi IKEDA, Katsuhiro ISHIMURA, Kohei OGURA, Koji YAMASHITA
Abstract: An indoor unit for an air-conditioning apparatus includes a casing, an up-down airflow direction plate rotatably supported in the air outlet, and an auxiliary airflow direction plate rotatably supported below, and on an upstream side of, the up-down airflow direction plate. The up-down airflow direction plate has a main blade part formed of a flat plate and a rear edge part formed of a flat plate. When the main blade part is in a horizontal state, the rear edge part is inclined upward to a back face of the casing from the main blade part. When an angle ? formed between the main blade part and the rear edge part and an angle ? formed between the main blade part and a virtual line through a center of a tip part of the auxiliary airflow direction plate, ? is greater than ?.
Abstract: An air conditioning operation analysis device includes: an air conditioning operation data acquirer that acquires air conditioning operation data of at least one air conditioner installed in a room, a room information acquirer that acquires room information indicating a configuration of the room, an environmental information data acquirer that acquires environmental information data from at least one sensor arranged in the room, and an outputter that outputs heat load data that is calculated based on the acquired air conditioning operation data, the acquired room information, and the acquired environmental information data.