Abstract: A video display method is provided that displays, on a per frame basis, an image included in a video signal. The method includes generating a first visible light communication image by encoding a visible light communication signal, the first visible light communication image being an image having a stripe pattern for visible light communication, and displaying, in a predetermined frame, the image included in the video signal. The method also includes switching a pitch of the first visible light communication image to a different pitch, and generating a second visible light communication image. The method further includes displaying the second visible light communication image that has a stripe pattern configured with a different minimum pitch, which is different in resolution from the stripe pattern of the first visible light communication image.

Abstract: In a power converter, vibration and noise of a motor due to pulsation of a direct current link voltage are reduced. An inverter circuit is provided, which is configured to convert a direct current link voltage having a pulsating component to an alternating current to output the alternating current to a permanent magnet synchronous motor. A controller is provided, which is configured to control the inverter circuit by vector control and which, in a control state in which fundamental voltage vectors do not include a zero vector (voltage vector for which a motor terminal voltage is zero), performs such control that the phase of a resultant voltage vector of a d-axis voltage vector and a q-axis voltage vector of the permanent magnet synchronous motor varies depending on pulsation.

Abstract: A refrigeration apparatus includes a refrigerant circuit with a compressor, a power module, a refrigerant cooler in contact with the power module, and an IPM motor which drives the compressor. A refrigerant in the refrigerant circuit flows through the refrigerant cooler, and cooling of the power module is performed by dissipating heat to the refrigerant flowing in the refrigerant cooler. A controller in the refrigeration apparatus outputs a driving signal to a drive circuit to reduce the number of switching operations of switching elements by performing overmodulation control such that there exists a carrier cycle in which no switching is performed.

Abstract: A visible light communication signal display method of displaying (i) an image represented by video signals and (ii) an image obtained by encoding visible light communication signals includes: encoding at least part of the visible light communication signals to generate an encoded image; generating a plurality of sub-images which correspond to respective partial images obtained by dividing the encoded image and each of which (i) includes a corresponding one of the partial images and (ii) except for the corresponding partial image, is an image having a substantially uniform luminance value lower than or equal to a predetermined luminance value; and displaying, in a video display period, the image represented by the video signals, and displaying the sub-images in time series in a communication period different from the video display period.

Abstract: A power conversion apparatus is equipped with switching devices to perform power conversion of input AC power supplied from an AC power supply to output AC power having a predetermined voltage and a predetermined frequency, and to supply the power to a motor connected thereto. The apparatus includes a controller controlling switching of the switching devices, a capacitor smoothing a ripple generated by the switching of the switching devices, a current controller controlling a current flowing to the motor, and a voltage distortion corrector detecting a harmonic component caused by distortion in motor input power, and superimposing compensation values on an output of the current controller in accordance with a value of the harmonic component.

Abstract: A video display method in which a visible light communication signal can be appropriately transmitted includes: Step SL 11 of generating a first visible light communication image that is an image having a stripe pattern for visible light communication, by encoding the visible light communication signal; Step SL12 of displaying, in a predetermined frame, an image included in the video signal; and Step SL13 of displaying, in the predetermined frame, the first visible light communication image sequentially thereafter an identification image that is an image having luminance uniformly lower than average luminance of the image that is displayed.

Abstract: A disclosed information processing method is executed in a distributed processing system that processes data by plural information processing apparatuses. And the information processing method includes: obtaining, by a first information processing apparatus of the plural information processing apparatuses and from a second information processing apparatus that manages relations among data, identification information of first data that has a predetermined relation with second data and identification information of an information processing apparatus that manages the first data, upon detecting access to the second data managed by the first information processing apparatus; reading out, by the first information processing apparatus, the first data, upon determining that the information processing apparatus that manages the first data corresponds to the first information processing apparatus; and loading, by the first information processing apparatus, the first data into a cache.

Abstract: A DC link is provided, which includes a capacitor connected in parallel to an output of a converter circuit, and outputs a pulsating DC link voltage. An inverter circuit is provided, which converts an output of the DC link to AC by switching, and supplies the AC to a motor connected thereto. A controller is provided, which controls switching of the inverter circuit so that motor currents pulsate in synchronization with pulsation of a power-supply voltage. The controller controls the switching of the inverter circuit in accordance with a load of the motor or an operational state of the motor, and reduces pulsation amplitude of the motor currents.

Abstract: An information communication method is provided for obtaining information from a subject. The information communication method includes transmitting position information indicating a position of an image sensor used to capture the subject, and receiving an ID list that is associated with the position indicated by the position information. The information communication method also includes setting an exposure time of the image sensor so that in a bright line corresponding to an exposure line included in the image sensor appears according to a change in luminance of the subject. The information communication method further includes obtaining a bright line image including the bright line, obtaining information by demodulating data specified by a cycle length or frequency of a stripe pattern of the bright line included in the obtained bright line image, and searching the ID list for identification information that includes the obtained information.

Abstract: An information communication method for obtaining information from a subject includes transmitting position information indicating a position of an image sensor used to capture the subject, and receiving an ID list that is associated with the position indicated by the position information. The method also includes setting an exposure time of the image sensor so that a bright line corresponding to an exposure line included in the image sensor appears according to a change in luminance of the subject. The method further includes obtaining a bright line image including the bright line by capturing the subject that changes in luminance by the image sensor with the set exposure time, obtaining the information by demodulating data specified by a pattern of the bright line included in the obtained bright line image, and searching the ID list for identification information.

Abstract: A bidirectional switch circuit includes two switching elements connected to conduct a current in both directions. The two switching elements are connected in series to each other. Of the two switching elements, the switching element to which a reverse voltage is applied, a voltage of a source of one of the switching elements being higher than a voltage of a drain of the one, is configured to conduct a current from the source to the drain even when an on-drive signal is not being input to a gate terminal of the one.

Abstract: An operation area of a motor is increased without increasing the capacity of a switching element. A current limiter which limits a current flowing in switching elements to prevent the current from exceeding a predetermined current limit value is provided. A current limit value controller which decreases the current limit value if a loss generated in the switching elements increases at a same current value, and increases the current limit value if the loss decreases at a same current value, is provided.

Abstract: A power converter circuit includes a diode group, a relay, a DC section and an inverter. The diode group includes a plurality of diodes arranged to rectify an output voltage of an alternating-current power supply. The relay is provided at a point located closer to the alternating-current power supply than the diode group. The DC section is where an output voltage of the diode group is applied. The inverter is arranged to output a three-phase alternating-electric current to a three-phase load. The DC section has a maximum pulse voltage twice as great as a minimum pulse voltage of the DC section. The DC section includes an energy-absorbing circuit having an electrolytic capacitor. The DC section further has a pathway arranged to apply the output voltage of the alternating-current power supply from the alternating-current power supply to the electrolytic capacitor via a rectifying circuit, not via the relay.

Abstract: A DC link has first and second power supply lines. A first rectifying circuit has a plurality of input terminals that input an AC voltage and a pair of output terminals connected to the DC link. An inverter converts a voltage applied to the DC link into another AC voltage. A boost chopper has a capacitor at an output stage. A switch switches discharge and non-discharge from the capacitor to the DC link. In the boost chopper, charge into the capacitor is performed at least at a first period. The first period is a part of a period during which a discharge duty as a time ratio of continuity of the switch is larger than 0.

Abstract: A display device according to the present disclosure includes: a backlight control unit configured to divide the luminescence surface of the backlight into a plurality of areas, and, based on the image signal, (i) perform luminescence control in each of the plurality of areas and (ii) set off periods starting at different times for the plurality of areas. The backlight control unit performs luminescence control in a visible light communication area which is at least one area among the plurality of areas in a period in which the visible light communication signal is output, based on the visible light communication signal, instead of performing luminescence control based on the image signal, and performs the luminescence control based on the image signal, in the visible light communication area, in a period in which the visible light communication signal is not output.

Abstract: An information processing program causes a computer to execute: encoding information to be transmitted, to determine a luminance change frequency; and outputting a signal of the determined luminance change frequency to cause a light emitter to change in luminance according to the determined luminance change frequency to transmit the information. In the encoding, each of a first frequency and a second frequency different from the first frequency is determined as the luminance change frequency. In the outputting, each of a signal of the first frequency and a signal of the second frequency is output as the signal of the determined luminance change frequency, to cause the light emitter to change in luminance according to the first frequency during a first time and change in luminance according to the second frequency during a second time different from the first time after the first time elapses.

Abstract: An information processing device includes a memory and a processor coupled to the memory, wherein the processor executes a process comprising selecting data included in a same file as deletion target data from the memory when deleting the data cached in the memory at the caching from the memory and deleting the deletion target data and the data selected at the selecting, from the memory.

Abstract: A video display method which allows a visible light communication signal to be appropriately transmitted includes: Step SL21 of generating an image having a stripe pattern as a visible light communication image; Step SL22 of calculating average luminance of the visible light communication image; Step SL23 of generating a visible light superimposition image by superimposing the visible light communication image only on, among one or more sub-images included in an image of a video signal that is displayed in the frame, a sub-image that is displayed in a specific sub-frame that is, among one or more sub-frames in each of which a corresponding one of the one or more sub-images is displayed, a sub-frame for representing the average luminance calculated; and Step SL24 of displaying the visible light superimposition image in the specific sub-frame.

Abstract: An information communication method for obtaining information from a subject includes transmitting position information indicating a position of an image sensor used to capture the subject, and receiving an ID list that is associated with the position indicated by the position information. The method also includes setting an exposure time of the image sensor so that a bright line corresponding to an exposure line included in the image sensor appears according to a change in luminance of the subject. The method further includes obtaining a bright line image including the bright line by capturing the subject that changes in luminance by the image sensor with the set exposure time, obtaining the information by demodulating data specified by a pattern of the bright line included in the obtained bright line image, and searching the ID list for identification information.

Abstract: A cooling structure for a magnet-equipped reactor includes: a magnet-equipped reactor (60) having a core (61) around which a coil (70) is wound, and a magnet (75) arranged to contact the core (61); and a cooling member (51) arranged to contact the magnet (75) of the magnet-equipped reactor (60) to cool the magnet (75).