Abstract: A drive circuit that includes a switching circuit switching between a first state and a second state to cause a light-emitting element to perform pulse oscillation, and a direct current adjustment circuit. In the first state, light is emitted from a light-emitting element by supplying the light-emitting element with a current having a magnitude equal to or greater than a threshold current enabling the light-emitting element to emit light having an output equal to or greater than a predetermined output. In the second state, the magnitude of the current supplied to the light-emitting element is less than the threshold current. The direct current adjustment circuit supplies, to the light-emitting element, a bias current within a range less than the threshold current of the light-emitting element in the second state. The bias current has a magnitude corresponding to a magnitude of undershoot occurring at a falling edge of the pulse oscillation.

Abstract: An image-capturing device includes: an illumination light source configured to emit illumination light to illuminate an object; a laser light source configured to emit laser light with a peak wavelength in a range of wavelengths absorbed or reflected by at least one region of the object; an imaging device configured to take an image of the object; a speckle variable device configured to change a speckle pattern in an image acquired by the imaging device over time; and an image processing device configured to process the image acquired by the imaging device, which includes: measuring a change over time in a intensity signal from each pixel constituting the image, and dividing an imaged region of the object into a plurality of portions based on a waveform of the change in the intensity signal over time.

Abstract: A light source device that supplies a constant current to a diode load that includes a plurality of light-emitting elements connected in series. The light source device includes a power supply circuit connected to the diode load and a peak current limiting circuit connected in series to the diode load. The peak current limiting circuit includes a current detector that is connected in series to the diode load and a current-regulating circuit that controls a current to the diode load by a detection voltage of the current detector. Further, the current detector has a series circuit including a resistor and a coil.

Abstract: A driver circuit includes: a current-controlling switching element electrically connected to a light emitting element; a differential amplifier circuit including: an output terminal electrically connected to the current-controlling switching element, a first input terminal configured to receive a reference signal as a reference for radiating light with a desired intensity from the light emitting element, and a second input terminal configured to receive a detection signal corresponding to a detection result of a current flowing in the light emitting element, wherein the differential amplifier circuit is configured to control the current flowing in the light emitting element and the current-controlling switching element based on a voltage of the first input terminal and a voltage of the second input terminal; and an adjustment part configured to adjust an overshoot amount of a rising edge of the current flowing in the light emitting element.

Abstract: According to one aspect of the present invention, an information processing apparatus includes a determination unit that determines whether an identifier extracted from a one-way communication packet received from a sensor includes a first value indicating another information processing apparatus as a legitimate destination, a second value indicating a user different from a user of the information processing apparatus as the legitimate destination, or a third value indicating a sensor different from a sensor associated with the information processing apparatus as an origination, and a transmission unit that transmits, to a server, a second packet in which the first, the second, or the third value is stored, if the identifier includes the first, the second, or the third value.

Abstract: According an aspect of the present invention, a data receiving apparatus includes a calculator. The calculator (1) stores a date and time indicated by the clock unit in association with a first local date and time in the memory as a reference date and time, when the packet includes first date-and-time data indicating the first local date and time and information indicating that the first date-and-time data can be used for date and time association, and (2) calculates, when the packet includes sensor data and second date-and-time data indicating a second local date and time associated with the sensor data, a third date and time based on a difference between the first local date and time and the second local date and time, and on the reference date and time.

Abstract: An information processing device according to one aspect of the present invention includes a receiver configured to receive a packet for one-way communication including data from an external device, an application execution unit configured to execute an application which processes the data, and an intermittent reception parameter adjustment unit configured to adjust an intermittent reception parameter for controlling an intermittent reception operation of the receiver so that when the application is operating in a background, a duty ratio of the intermittent reception operation is smaller than when the application is operating in a foreground.

Abstract: According to the first aspect of the present invention, a data transmission apparatus includes a transmission control unit which generates a packet for one-way communication including first difference sensor data, and a transmission unit which transmits the generated packet. The first difference sensor data is a difference between first sensor data measured by a sensor and a reference value associated with the first sensor data.

Abstract: A data transmitting apparatus include a measurement control unit to measure an amount relating to biological information; an encryption key generation control unit to generate, as an encryption key, information calculated from first shared information and second shared information that is shared with a receiving apparatus; an encryption control unit to encrypt the biological information with the encryption key and generate encryption data; a packet generation control unit to generate a one-way transmission packet that includes the first shared information and the encryption data; and a transmitter to transmit the packet.

Abstract: According to an aspect of the invention, a data transmitting apparatus includes a transmitting unit that transmits a first packet through a unidirectional communication based on an instruction to transmit the first packet, and that transmits a second packet through a unidirectional communication based on an instruction to transmit the second packet.

Abstract: According to an aspect of the present invention, a data receiving apparatus includes a receiver configured to receive a one-way communication packet transmitted from a data transmitting apparatus; a calculator configured to calculate a reception signal strength of the packet at the receiver; a comparison unit configured to compare the calculated reception signal strength with a threshold value; a generation unit configured to generate assistance information relating to transmission power of the data transmitting apparatus if the reception signal strength exceeds a threshold value as a result of the comparison; and an output unit configured to output the assistance information.

Abstract: A measuring device according to one aspect of the present invention includes a processor configured to acquire, from a sensor, a first, a second, a third and a fourth measurement result obtained by measuring a value related to information at time intervals using the sensor, transmit the first measurement and the second measurement result in a one-way communication packet during a first period from when the second measurement result is obtained until the third measurement result is obtained, and transmit the second and the third measurement result in the one-way communication packet during a second period from when the third measurement result is obtained until the fourth measurement result is obtained.

Abstract: An image-capturing device includes: an illumination light source configured to emit illumination light to illuminate an object; a laser light source configured to emit laser light with a peak wavelength in a range of wavelengths absorbed or reflected by at least one region of the object; an imaging device configured to take an image of the object; a speckle variable device configured to change a speckle pattern in an image acquired by the imaging device over time; and an image processing device configured to process the image acquired by the imaging device, which includes: measuring a change over time in a intensity signal from each pixel constituting the image, and dividing an imaged region of the object into a plurality of portions based on a waveform of the change in the intensity signal over time.

Abstract: A driver circuit includes: a variable power supply configured to apply a power supply voltage to a light emitting device and to vary a voltage value of the power supply voltage; a current-control switching device electrically connected to the light emitting device and configured to control a current flowing in the light emitting device; a detection part configured to detect a current value and a voltage value related to the current flowing in the light emitting device; and a control part configured to determine a minimum voltage of the power supply voltage based on a detection result of the detection part.

Abstract: A data transmitting apparatus include a measurement control unit to measure an amount relating to biological information; an encryption key generation control unit to generate, as an encryption key, information calculated from first shared information and second shared information that is shared with a receiving apparatus; an encryption control unit to encrypt the biological information with the encryption key and generate encryption data; a packet generation control unit to generate a one-way transmission packet that includes the first shared information and the encryption data; and a transmitter to transmit the packet.

Abstract: According an aspect of the present invention, a data receiving apparatus includes a calculator. The calculator (1) stores a date and time indicated by the clock unit in association with a first local date and time in the memory as a reference date and time, when the packet includes first date-and-time data indicating the first local date and time and information indicating that the first date-and-time data can be used for date and time association, and (2) calculates, when the packet includes sensor data and second date-and-time data indicating a second local date and time associated with the sensor data, a third date and time based on a difference between the first local date and time and the second local date and time, and on the reference date and time.

Abstract: An information processing device according to one aspect of the present invention includes a receiver configured to receive a packet for one-way communication including data from an external device, an application execution unit configured to execute an application which processes the data, and an intermittent reception parameter adjustment unit configured to adjust an intermittent reception parameter for controlling an intermittent reception operation of the receiver so that when the application is operating in a background, a duty ratio of the intermittent reception operation is smaller than when the application is operating in a foreground.

Abstract: According to the first aspect of the present invention, a data transmission apparatus includes a transmission control unit which generates a packet for one-way communication including first difference sensor data, and a transmission unit which transmits the generated packet. The first difference sensor data is a difference between first sensor data measured by a sensor and a reference value associated with the first sensor data.

Abstract: According to one aspect of the present invention, an information processing apparatus includes a determination unit that determines whether an identifier extracted from a one-way communication packet received from a sensor includes a first value indicating another information processing apparatus as a legitimate destination, a second value indicating a user different from a user of the information processing apparatus as the legitimate destination, or a third value indicating a sensor different from a sensor associated with the information processing apparatus as an origination, and a transmission unit that transmits, to a server, a second packet in which the first, the second, or the third value is stored, if the identifier includes the first, the second, or the third value.

Abstract: A measuring device according to one aspect of the present invention includes a measurement control unit configured to acquire a measurement result obtained by measuring a quantity related to information on a user using a sensor, a packet generation unit configured to generate a one-way communication packet including the acquired measurement result, an action determination unit configured to determine whether or not the user is taking a specific action, a transmission interval adjusting unit configured to adjust a transmission interval based on a result of a determination by the action determination unit, and a packet transmission unit configured to transmit the packet at the adjusted transmission interval.