Nippon Telegraph and Telephone Corporation

Nabtesco Corporation

Mitsubishi Rayon Company, Limited

Nabco Limited

Shigeaki Sasaki

Kimitaka Tsutsumi

Yusuke Hiwasaki

Kenji Nishigaki

Yasutaka Kanda

Masahiro Fukui

Hirotoshi Mizota

Tomonari Murakami

Motomu Oh-Kita

Kazunori Mano

Yoshihiro Uozu

Takeshi Kitayama

Yasukazu Yoshida

Koji Ishizaka

Tatsuyuki Takayanagi

Jun-ichiro Atarashi

Masaharu Yanai

Takehiro Moriya

Takeshi Mori

Shinji Hayashi

Takashi Akita

Takashi Wada

Toshinori Sumi

Hitoshi Ohmuro

Masashi Okamoto

Akitoshi Kataoka

Naoki Iwakami

Jun Okumura

Kikue Irie

Hisayuki Kanki

Satoshi Miki

Yoshinari Kiyomasa

Koji Kakuyama

Ye Zengguang

Yoshinori Fukuba

Kouzi Ishizaka

Hitoshi Ohmura

A special detection area in which detection in accordance with an activation detection algorithm for detecting a person or an object and detection in accordance with a protection detection algorithm having a higher detection sensitivity for the person or the object than the activation detection algorithm are performed is provided. Results of the detections in accordance with the activation detection algorithm and the protection detection algorithm are individually output to an automatic door device.

Automatic door sensor, automatic door system, and method of controlling automatic door system

A normalization value calculatorcalculates a normalization value that is representative of a predetermined number of input samples. A normalization value quantizerquantizes the normalization value to obtain a quantized normalization value and a normalization-value quantization index corresponding to the quantized normalization value. An quantization-candidate calculatorsubtracts a value corresponding to the quantized normalization value from a value corresponding to the magnitude of each of the samples to obtain a difference value and, when the difference value is positive and the value of each of the samples is positive, sets the difference value as an quantization candidate corresponding to the sample. When the difference value is positive and the value of each of the samples is negative, the quantization-candidate calculatorreverses the sign of the difference value and setting the sign-reversed value as an quantization candidate corresponding to the sample. When the difference value is not positive, the quantization-candidate calculatorsets 0 as an quantization candidate corresponding to the sample. A vector quantizerjointly vector-quantizes a plurality of quantization candidates corresponding to a plurality of samples to obtain a vector quantization index.

Coding method, decoding method, apparatus, program, and recording medium

In encoding, index information indicating a group of coefficients that minimizes the sum of the error between the value of each sample and the value is obtained by multiplying the quantized value of each of a plurality of samples by a coefficient corresponding to the position of the sample. The coefficient is selected from a plurality of groups of predetermined coefficients corresponding to the positions of the samples. In decoding, a plurality of values corresponding to an input vector quantization index are obtained as decoded values corresponding to a plurality of sample positions. With the use of a group of predetermined coefficients corresponding to the plurality of sample positions and indicated by input index information, the values obtained by multiplying the decoded values and the coefficients, corresponding to the sample positions are output.

Encoding method, decoding method, encoding device, decoding device, and recording medium for a plurality of samples

A coding method with a small error is provided. In the coding method of the present invention, a normalization value obtained from an input signal is corrected for an error calculated from an input and output in vector quantization and is then quantized. The coding method includes a normalization stage of normalizing the input signal in accordance with the normalization value of the input signal, calculated in each frame; a dividing stage of dividing the normalized frame into divided input signal sequences in accordance with a predetermined rule; a vector quantization stage of applying vector quantization to the divided input signal sequences to generate a vector quantization index; and a normalization value correction stage of correcting the normalization value of the input signal for the error obtained from the input and output in the vector quantization stage.

Coding method, decoding method, apparatuses thereof, programs thereof, and recording medium

A plurality of samples are vector-quantized to obtain a vector quantization index and quantized values; bits are assigned in a predetermined order of priority based on auditory perceptual characteristics to one or more sets of sample positions among a plurality of sets of sample positions, each set having a plurality of sample positions and being given an order of priority based on the auditory perceptual characteristics, the number of bits not being larger than the number of bits obtained by subtracting the number of bits used for a code corresponding to the vector quantization index from the number of bits assigned for the code corresponding to the vector quantization index; and index information indicating a group of coefficients that minimizes the sum of the error between the value of each sample included in each of the sets of sample positions to which the bits are assigned and the value obtained by multiplying the quantized value of each sample included in the set of sample positions by a coefficient corresponding to the position of the sample, of all the sample positions included in the set of sample positions, is output.

Encoding method, decoding method, encoding device, decoding device, program, and recording medium

An automatic door sensor includes light-emitters that cyclically emit and project light, and lenses that deflect emitted light in the direction perpendicular to a door opening. Light-receivers receive the projected light through segmented lenses. For each of the light-emitters, a setting unit sets therein whether each light-emitter should emit light. A control unit judges whether a human or an object is present in a surveillance area based on how the light-receivers receive light.

Sensor for use with automatic door having a setting unit for setting whether or not each light emiter should emit light

Whether interruption is present in the connections of automatic door constituting units is detected. A plurality of automatic door constituting units (and) are interconnected in such a manner that they can communicate with each other via a bus (). The automatic door constituting units include a door controller () for controlling opening and closing of a door. The door controller () successively calls the other automatic door constituting units one by one via the bus (), and the other automatic door constituting units send a response to the calling via the bus (). The door controller () judges that the automatic door constituting unit the door controller () called is disconnected from the bus (), when said called automatic door constituting unit does not send a response within a predetermined time after the calling.

Automatic door system

A first area () for detecting an object is formed by a radio wave or an ultrasonic wave, and a second area () for detecting an object by means of light is formed near the first area (). When an object is detected in the first area () approaching the second area (), the second area () is enabled. When an object is detected in the first area () moving in the direction away from the second area (), the second area () is disabled.

Composite sensor for door and automatic door system

This invention provides a process for manufacturing a methyl methacrylate polymer comprising the steps of feeding a monomer containing at least 80 wt % of methyl methacrylate and a radical polymerization initiator represented formula (III) to a reactor; polymerizing the material at a polymerization temperature of 110 to 160&#xb0; C. under the conditions satisfying particular equations between an initiator concentration and a polymerization temperature; feeding a reaction mixture taken out from the reactor to a devolatilization step (feeding step); and separating and removing volatiles from the reaction mixture (devolatilization step). A methyl methacrylate polymer having adequately good optical properties and a plastic optical fiber having improved transmission performance can be prepared according to this invention 

Plastic optical fiber, optical fiber cable, optical fiber cable with plug, method for producing methyl methacrylate based polymer and method for producing plastic optical fiber

A radio-wave transmitter-receiver section () forms a radio-wave detection zone () for detecting an object at a location way from a door (). A light emitter-receiver section () forms an optical detection zone () for detecting an object at a location along and closer to the door (). The light emitter-receiver section () includes mirrors () which are used to increase or decrease the depth dimension of the optical detection zone () in the direction perpendicular to the door ().

Composite sensor for door

The present invention relates to a production method of a plastic optical fiber which comprises the steps of heat drawing an undrawn plastic optical fiber obtained by melt spinning and annealing the drawn fiber at a circumferential velocity ratio between the front and rear rollers (circumferential velocity of a rear roller/circumferential velocity of a front roller) of 0.5 to 1.2 under heating conditions which satisfy 4&#x2266;y&#x2266;&#x2212;1.5x+330 and (Tgc&#x2212;5)&#xb0; C.&#x2266;x&#x2266;(Tgc+110)&#xb0; C. [Tgc: a glass transition temperature of a core, x: an annealing temperature (&#xb0; C.), and y: an annealing time (seconds)]. According to the present invention, a plastic optical fiber having a small thermal shrinkage ratio and excellent heat resistance can be provided.

Plastic optical fiber, optical fiber cable, plugged optical fiber cable, and production methods thereof

In the CELP coding system a low-order synthesis filter and a cascade-connected synthesis filter formed by a cascade connection of low- and high-order synthesis filters are provided, a synthesized acoustic signal is estimated in a mode decision part for an input acoustic signal, and the estimated synthesized acoustic signal is subjected to inverse filtering by an inverse filter corresponding to the low-order synthesis filter and an inverse filter corresponding to the cascade-connected synthesis filter to obtain residual signals. That one of the synthesis filters which corresponds to the residual signal of smaller power is selected by a switch, and a codebook is searched for indices which will minimize the error between the output synthesized acoustic signal by the selected synthesis filter and the input acoustic signal.

Audio coding and decoding methods and apparatuses and recording medium having recorded thereon programs for implementing them

This invention provides a process for manufacturing a methyl methacrylate polymer comprising the steps of feeding a monomer containing at least 80 wt % of methyl methacrylate and a radical polymerization initiator represented formula (III) to a reactor; polymerizing the material at a polymerization temperature of 110 to 160&deg; C. under the conditions satisfying particular equations between an initiator concentration and a polymerization temperature; feeding a reaction mixture taken out from the reactor to a devolatilization step (feeding step); and separating and removing volatiles from the reaction mixture (devolatilization step). A methyl methacrylate polymer having adequately good optical properties and a plastic optical fiber having improved transmission performance can be prepared according to this invention.

An object sensor for use with an automatic swing door includes a light emitter, which is mounted on a door surface of the automatic swing door. The light emitter emits a light beam toward a floor. A distance detector is mounted on the door surface. The distance detector receives the light beam reflected from an object and develops an output signal having a value representing the distance of the object from the distance detector. A control unit makes a judgment based on the value of the output signal of the distance detector as to whether the object is approaching the door surface. The control unit stores the value of the distance detector output signal representing the distance between the distance detector and the floor, as a reference value. A dead zone is defined for the reference value to extend from the floor to a predetermined distance above the floor. When the value of the distance detector output signal is outside the dead zone, the control units judges the object to be approaching the door surface.

Growing community of inventors

Tokyo, Japan

Shigeaki Sasaki