Sharp Kabushiki Kaisha Corporation

Sharp Kabushiki Kaisah

Tetsuya Okumura

Shigemi Maeda

Yoshihisa Adachi

Hiroshi Fuji

Tetsuya Hayashi

Rieko Ogawa

Hideharu Tajima

Jun Akiyama

Yuki Edo

Ryota Tomizawa

Takashi Arimoto

Takashi Nunokawa

Masaki Yamamoto

Go Mori

Hirohisa Yamada

Yasuhiro Harada

Toshihiko Sakai

Atsushi Etoh

Ikuo Nakano

Tomiyuki Numata

Teruhisa Kotani

Takanobu Sato

Junya Onishi

Hiroyasu Ueno

Masanori Ushioda

Hinatsu Ohgane

An image capturing device includes: an image capturing unit configured to capture a 4K or higher resolution moving image; and a selector switch configured to switch an image capturing mode in which the image capturing unit captures the moving image from a first image capturing mode to a second image capturing mode, the second image capturing mode providing a higher resolution in detecting an amount of change in pulse wave information representing a pulse wave of a living body in the captured moving image than does the first image capturing mode.

Image capturing device, biological information acquisition device, and image capturing method

Performance of a biological information acquisition device of a non-contact type is appropriately evaluated. An evaluation system evaluating a first biological information acquisition device of a non-contact type includes a first body movement suppressing unit that suppresses body movement of a first region, a first body movement detecting unit that detects a first body movement amount, which indicates a magnitude of the body movement of the first region, in a non-contact manner, and a second biological information acquisition device different from the first biological information acquisition device. The evaluation system outputs validity information which indicates that an evaluation result of the first biological information acquisition device is valid, in a case where the first body movement amount is equal to or less than a first threshold.

Evaluation system evaluation device, and biological information acquisition device

A biological information measuring instrument performs high precision biological information measurement on a living body. The biological information measuring instrument includes: a measuring unit and an analysis unit that measure a user in a contactless manner to acquire biological information; and a speech unit that produces an alarm for reducing body movements of the user. The measuring unit and the analysis unit start to acquire biological information at an acquisition starting time. A control unit sets the acquisition starting time so as to fall in a prescribed range of time defined using an alarm starting time for the speech unit as a reference.

Biological information measuring instrument, and method, device, and computer-readable storage medium containing a program for controlling the instrument

Pulse waves of a living body are detected with high accuracy. A pulse wave detection device includes a camera configured to capture an image of the living body a plurality of times through a first green filter and an infrared light filter having light transmission characteristics in a near-infrared light wavelength range within a wavelength range where a light absorption coefficient of oxidized hemoglobin is greater than a light absorption coefficient of reduced hemoglobin, and an image analysis unit configured to analyze a plurality of images of the living body captured by the camera and to detect the pulse waves of the living body. The image analysis unit is configured to detect the pulse waves by detecting a change in intensity of light in the near-infrared light wavelength range indicated by the plurality of images.

Pulse wave detection device, image analysis device, and biometric information generation system

Signal processing apparatus includes: an input interface configured to receive an output signal Vfrom a sensor; a prediction circuit configured to generate, on the basis of a relationship different depending on each of a plurality of converged values V, a plurality of predicted values Vcorresponding to a value of the output signal that would be obtained at a time Tafter a time T, in a transition response period before a response time period Tr elapses where Tr denotes a response time period required for a value of the output signal Vto become a converged value Vcorresponding to a value P of a parameter representing a certain property of an object to be measured, in accordance with a value Vof the output signal obtained at the time T; and an estimation circuit configured to generate, on the basis of the value Vof the output signal obtained at the time Tand the plurality of predicted values V, an estimated value Pe of a parameter representing the certain property of the object to be measured.

Signal processing apparatus and signal processing method

A signal processing device () includes a prediction circuit () configured to generate Vcorresponding to an output signal to be obtained at Tafter T, in accordance with Vobtained at the time T, in a transition response period before Tr or Td elapses, where Tr denotes a time period during which an output signal Vof a sensor () changes from a converged value Vcorresponding to a parameter Prepresenting a certain property of an object to be measured to a converged value Vcorresponding to P, and Td denotes a time period during which Vchanges from Vto V. The prediction circuit generates the predicted value so that TrE&#x3c;Tr, TdE&#x3c;Td, |1&#x2212;Td/Tr|&#x3e;|1 &#x2212;TdE/TrE| are satisfied, where TrE denotes a time period during which the predicted value becomes a value corresponding to V, and TdE denotes a time period during which the predicted value becomes a value corresponding to V

Signal processing device and signal processing method

An image watching glasses identification device(oror) is an image watching glasses identification device(oror) for identifying a pair of shutter glassesthrough which to watch an image displayed on a display device, the image watching glasses identification device(oror) including: an identification information obtaining sectionfor obtaining an identification information item for identifying the pair of shutter glassesand; a display control sectionfor causing the display deviceto display an identification result associated with the identification information item obtained by the identification information obtaining section. This makes it possible to provide an image watching glasses identification device that is capable of causing, when a viewer watches through the pair of image watching glassesthe image displayed on the display device, the display deviceto display the identification result. The identification result enables the viewer to identify the pair of image watching glasses worn by the viewer.

Image watching glasses identification device, image watching system, pair of image watching glasses, image watching glasses identification program, computer-readable recording medium, and display device

An invention disclosed includes a layer number obtaining section () for determining which information storage layer (L) has been accessed and a layer type identifying section () for identifying a type of the information storage layer (L) determined by the layer number obtaining section (). With the configuration, even in a case where an information recording and reproducing apparatus accesses an information storage layer different from an intended information storage layer by false operation or the like, it is still possible to dissolve mismatching between a recording or reproduction control scheme being set up and a recording or reproduction control scheme suitable for the information storage layer thus accessed.

Information recording and reproducing apparatus, program for controlling same, computer-readable storage medium, method for controlling information recording and reproducing apparatus, and information storage medium

An optical reproducing device is provided with predetermined length mark signal measurement means which measures amplitude values of a 2T mark and an 8T mark, which are a short reproducing power control mark and a long reproducing power control marks, respectively, from information data recorded in an magneto-optical disk. Reproducing power of a light beam is controlled by a laser power control circuit, based on the amplitude values of the 2T mark and the 8T mark. The predetermined length mark signal measurement means detects a specific pattern including the 2T mark from a bit arrangement pattern of the information data, and measures the amplitude value of the 2T mark correponding only to the 2T mark included in the specific pattern. This structure can provide an optical reproducing device which can maintain the reproducing power at an optimum value and reduce the probability of reading errors, without reducing the utilization ratio of an optical recording medium.

Optical reproducing device that controls the strength of the light beam during reproduction

A signal evaluation device for evaluating a decoded signal of maximum likelihood decoding includes: a differential metric circuit for finding differential metrics; comparators for judging whether a difference of differential metrics exceeds a predetermined threshold; counters for counting respective output pulses of the comparators; and a controller for finding the probability of the differential metrics falling at or below the predetermined threshold, based on the number of measured samples and the number of samples counted by the counters, and processing the probability by arithmetic operations so as to obtain an index of signal evaluation. With this arrangement, signal evaluation devices for evaluating a recording medium or a recording medium driving device can have a simpler structure and can perform evaluations in a plurality of PR modes.

Signal evaluation devices and signal evaluation methods, signal quality evaluation methods and reproducing devices and recording devices

The waveform equalizing device includes: an FIR filter for generating an equalized signal pattern y(i, n) on the basis of equalization of a waveform of the reproduced signal pattern u(i, n); a Viterbi decoding circuit for detecting a path metric difference s(n) between a correct path determined as a survivor path and an error path which fails to survive the correct path in Viterbi decoding based on the equalized signal pattern y(i, n); a target register for setting a target value ds for the path metric difference s(n); and a tap coefficients update circuit for adapting the equalization according to an error of the detected path metric difference from the target value. The tap coefficients update circuit adapts equalization properties so that the mean square error is minimized, thereby achieving a satisfactory result in lowering the error rate.

Adaptive waveform equalization for viterbi-decodable signal and signal quality evaluation of viterbi-decodable signal

There is provided a signal evaluation apparatus and signal evaluation method capable of consistently measuring an accurate bit error rate regardless of the distribution profile of the difference of likelihoods (difference metrics) of data sequences. In the signal evaluation apparatus for decoding data sequences by means of maximum likelihood decoding, at least one pair of paths between which a distance has a minimum value are selected by a path selector circuitWith regard to the paths selected by the path selector circuita difference metric obtained by a difference metric calculator circuitis statistically processed by a &#x3bc;- and &#x3c3;-calculator circuitto calculate a bit error rate. Then, the bit error rate is corrected by correction means () on the basis of the number of measurement samples of the paths selected by the path selector circuitand the number of all samples.

Signal evaluation apparatus and signal evaluation method

An optical reproducing device according to the present invention detects mean amplitude values of short marks and long marks, which are recorded marks for reproducing power control, by means of a short mark level detecting circuit and a long mark level detecting circuit. Then a differential amplifier compares a ratio between these two mean amplitude values with a standard value, and outputs the result of this comparison. Thereafter, a reproducing power control circuit controls reproducing power of a semiconductor laser such that the absolute value of this comparison result is reduced. Since mean values of the amplitude values of the short marks and long marks are detected, the detection results are very accurate, and the precision of control of reproducing power can be greatly improved.

Optical reproducing device and optical memory medium

An optical reproduction apparatus in accordance with the present invention has a gain control circuit for controlling a gain of an amplifier circuit which amplifies a reproduction signal in accordance with amplitudes of the reproduction signal from an optical recording medium. The amplitude is sent to a power control calculation circuit which controls the reproduction power of a light beam in accordance with the amplitude. The gain control circuit has a slower response speed than that of the power control circuit at least during a period when the power control circuit controls the reproduction power. This allows to provide an optical reproduction apparatus that can realize the stable reproduction power and automatic gain control even to the unevenness of the amplitudes of the reproduction signal.

Optical reproduction apparatus

A magneto-optical disk recording and reproducing device, which carries out recording and reproducing for a magnetic super-resolution magneto-optical disk including a recording layer and reproducing layer, has a recording data processing circuit which records long recording marks at different positions between adjacent tracks in a radius direction, each of the long recording marks being larger in diameter than an aperture formed on the reproducing layer by projecting thereon the light beam. According to this arrangement, it is possible to continuously reproduce a data recording area with high accuracy and optimum reproducing power without being affected by adjacent tracks.

Magneto-optical recording medium and magneto-optical recording and reproducing device capable of controlling reproduction power based on long recorded marks

Growing community of inventors

Neyagawa, Japan

Tetsuya Okumura