Abstract: An illumination optical system includes a first compression system configured to compress a light flux on each of first and second sections, a second compression system configured to compress the light flux on the first section, a polarization converter arranged so that a section that contains a normal of the second polarization splitting surface and the optical axis becomes the second section, and configured to convert non-polarized light into linearly polarized light, a first lens array arranged in front of the polarization converter along an optical path, and a second lens array arranged between the first lens array and the polarization converter along the optical path. Both of the first lens array and the second lens array have no optical power on the second section.

Abstract: An ophthalmic apparatus capable of suppressing ghost, and securing a necessary amount of working distance even when an eye to be inspected has a diopter on a myopia side, includes: a large area image acquisition unit acquiring a large area image of a fundus of the eye to be inspected at a low resolution based on return light of first measuring light from the fundus; a small area image acquisition unit acquiring a small area image of the fundus at a high resolution based on return light of second measuring light from the fundus; and a dichroic prism combining the first measuring light and the second measuring light, and dividing the return light, in which the large area image acquisition unit includes an optical member having a positive optical power, which is arranged at a position opposite to the eye to be inspected with respect to the dichroic prism.

Abstract: An echo cancellation device includes: a full-band echo canceller that generates a pseudo-echo signal; a downsample processor that downsamples a received signal and extracts a low-band component delayed by a delay amount D1; a delay controller that delays the low-band component by a delay amount D2; a delay controller that delays an output signal of the delay controller by a delay amount D3; a low-band echo canceller that generates a pseudo-echo signal delayed by a delay amount D1+D2; and an upsample processor that upsamples the low-band pseudo-echo signal to generate a full-band pseudo-echo signal delayed by the delay amount 2D1+D2. The delay controllers control the delay amounts D2 and D3 such that a tap length LA satisfies a condition of LA?2D1+D2=D2+D3, the tap length LA indicating a response time of the adaptive filter in the full-band echo canceller.

Abstract: In a rotor blade cylindrical portion or a stator portion in which thread grooves are formed, convex surfaces (thread groove peak surfaces) configuring the peak sections of the thread grooves are cut by a desired amount over the entire circumference (a circumferential direction of the thread grooves) of a certain range in an axial direction. As a result, the gap on the lower side of the thread groove portion can partially be expanded by cutting the thread groove peak surfaces by a desired amount.

Abstract: According to one embodiment, a wearable electronic device includes a first sensor, a second sensor and a hardware processor. The first sensor is configured to detect a motion of a user wearing the electronic device. The second sensor is configured to acquire biological information related to the user. The hardware processor is configured to determine whether the user is in an awake state or in an asleep state based on the detection value of the first sensor, and to control operation of at least one of the first sensor and the second sensor.

Abstract: According to one embodiment, an electronic apparatus includes a biological sensor, an extraction module, a state detector, and a transmission controller. The biological sensor generates first biological data. The extraction module extracts one or more first features from the first biological data. The state detector detects a communication state between a communication module and a server. The transmission controller transmits at least one of the first biological data and the one or more first features to the server, based on the detected communication state.

Abstract: In general, according to one embodiment, an electronic device includes circuitry. The circuitry is configured to acquire audio data obtained by collecting sounds around the electronic device, and to identify, based on the acquired audio data, the type of the surrounding environment using a density of people around the electronic device or information as to whether a surrounding natural environment is present.

Abstract: An optical unit includes a plurality of paraboloid mirrors configured to reflect light fluxes from a plurality of LDs and to guide them to a concave lens. The light fluxes from the paraboloid mirrors are a plurality of convergent light fluxes, and the paraboloid mirrors reflect the light fluxes from the LDs such that as the convergent light fluxes travel farther away from the paraboloid mirrors, distances therebetween become shorter.

Abstract: According to one embodiment, a wearable electronic apparatus detects movement of a human body wearing the apparatus. The apparatus causes a first number of light emitters to emit light when a magnitude of the detected movement is less than a first value. The first number of light emitters is among a plurality of light emitters which emit light having different wavelengths, in which the light are received by a light receiver to obtain physiological information. The apparatus causes a second number greater than the first number of light emitters among the plurality of light emitters to emit light when the magnitude of the detected movement is greater than or equal to the first value.

Abstract: A power source device includes an assembled battery having a plurality of secondary battery cells connected in series, and a plurality of discharge circuits connected in parallel with the secondary battery cells, respectively. A charge control circuit performs constant current charging to the assembled battery, and when voltages of one or a plurality of the secondary battery cells out of the plurality of secondary battery cells have reached a prescribed first voltage, drives the discharge circuits connected to the secondary battery cells whose voltage have reached the first voltage to discharge, and performs constant voltage charging to the relevant assemble battery.

Abstract: An echo cancellation device includes: a full-band echo canceller that generates a pseudo-echo signal; a downsample processor that downsamples a received signal and extracts a low-band component delayed by a delay amount D1; a delay controller that delays the low-band component by a delay amount D2; a delay controller that delays an output signal of the delay controller by a delay amount D3; a low-band echo canceller that generates a pseudo-echo signal delayed by a delay amount D1+D2; and an upsample processor that upsamples the low-band pseudo-echo signal to generate a full-band pseudo-echo signal delayed by the delay amount 2D1+D2. The delay controllers control the delay amounts D2 and D3 such that a tap length LA satisfies a condition of LA ?2D1+D2=D2+D3, the tap length LA indicating a response time of the adaptive filter in the full-band echo canceller.

Abstract: According to an embodiment, an electronic device includes, for example, an indicator, a sensor, and circuitry. The indicator is configured to notifying a user by using at least one of a sound and vibration. The sensor is configured to detect first information regarding a body of a user, the first information possibly subject to disturbance during notifying by the indicator. The circuitry is configured to replace the first information during notifying by the indicator with second information different from the first information.

Abstract: According to an embodiment, for example, an electronic device wearable on a body, the electronic device including: a first sensor to emit light to a body and to output a signal corresponding to a received amount of light that has passed through a body or has been reflected by a body; and a circuitry to determine whether the electronic device is on the body, by using amplitude and frequency information corresponding to a pulse in the signal output from the first sensor.

Abstract: An echo cancelling device splits a low-band signal through LPFs having characteristics which do not cause aliasing during downsampling of downsamplers, and splits a high-band signal through HPFs having characteristics which do not cause aliasing during downsampling of downsamplers. The echo canceling device generates a mid-band signal by subtracting the low-band signal and the high-band signal from a pre-split signal by adder-subtractors, and cancels an echo on a band-by-band basis.

Abstract: According to one embodiment, a wearable electronic device includes communication circuitry configured to communicate with an external device, and transmit access right information to the external device, the access right information for a write access right to first data stored in a server, the first data corresponding to a user of the electronic device.

Abstract: According to one embodiment, an electronic apparatus determines whether a vital sign sensor is in contact with a human body and determines whether a contact state between the vital sign sensor and the human body is stable. The apparatus obtains an effective time-series signal by removing, from an output time-series signal of the vital sign sensor, a first time-series signal and a second time-series signal, the first time-series signal corresponding to a time period of a non-contact state and a second time-series signal corresponding to a time period of an unstable state. The apparatus analyzes the effective time-series signal to measure a value associated with a vital sign signal of the human body.

Abstract: According to one embodiment, a first processing module adds, to a first queue, output sound data output from a first task, with a time stamp attached thereto. A second processing module adds, to a second queue, input sound data received from a microphone, with a time stamp attached thereto. A controller fetches first output sound data as reference data from the first queue, the first output sound data having a time stamp whose time difference from a time stamp of first input sound data in the second queue falls within a predetermined range. An echo canceller performs echo cancelling processing to cancel an echo component in the first input sound data based on the reference data.

Abstract: An illumination optical system illuminates an image display element and includes a first lens array configured to divide light emitted from a light source, a second lens array configured to receive light from the first lens array, and a condenser optical system configured to guide light from the second lens array to the image display element, and a conjugate point of the image display element is located between an incident surface of the first lens array and an incident surface of the second lens array.

Abstract: A signal processing apparatus is configured to change volume level or frequency characteristics of an input signal with a limited bandwidth in a first frequency range. The apparatus includes: an information extracting unit configured to extract second frequency characteristic information from a collection signal with a limited bandwidth in a second frequency range different from the first frequency range; a frequency characteristic information extending unit configured to estimate first frequency characteristic information from the second frequency characteristic information extracted by the information extracting unit, the first frequency characteristic information including the first frequency range; and a signal correcting unit configured to change volume level or frequency characteristics of the input signal according to the first frequency characteristic information obtained by the frequency characteristic information extending unit.

Abstract: According to one embodiment, an electronic apparatus wearable by a user includes one or more sensors, a processor and a controller. The processor is configured to determine whether the user is in a waking state or a sleeping state by using a detected value of at least one sensor of the one or more sensors. The controller is configured to set an operation mode of the apparatus in a first apparatus mode if it is determined that the user is in a waking state, and to set the operation mode of the apparatus in a second apparatus mode if it is determined that the user is in a sleeping state.