Patent application number | Description | Published |
20100306617 | DECODER DEVICE, DECODING METHOD AND MAGNETIC DISK DEVICE - According to one embodiment, a decoder device includes a decoder configured to decode a to-be-decoded sequence by performing an iterative decoding process and to perform a parity check of a decoding result using a check matrix, a detector configured to detect that the to-be-decoded sequence is a non-code word based on a parity check result for each row of the check matrix by the decoder, and a controller configured to control the decoder according to a detection result of the detector. | 12-02-2010 |
20120110416 | DATA STORAGE APPARATUS WITH ENCODER AND DECODER - According to one embodiment, an encoder/decoder apparatus includes an encoder module, a decoder module, and a transposing module. The encoder module is configured to generate a Hamming code from the input data, in accordance with a check matrix having a specific regularity. The decoder module is configured to detect an error position in the output data composed of the Hamming code, in accordance with the check matrix. The transposing module is configured to perform a transposing process of transposing some of the columns of the check matrix, while maintaining the regularity of the check matrix, and to change the error position in accordance with the transposing process, during the decoding process. | 05-03-2012 |
20120198304 | INFORMATION REPRODUCTION APPARATUS AND INFORMATION REPRODUCTION METHOD - According to one embodiment, an information reproduction apparatus includes a calculator, selector, and decoder. The calculator calculates parity-check passing ratios based on a check matrix of an LDPC code for code word candidates included in a reproduced signal. The selector selects one of the code word candidates based on the parity-check passing ratios calculated by the calculator. The decoder decodes the code word candidate selected by the selector by an iterative decoding process. | 08-02-2012 |
20120274487 | APPARATUS FOR ENCODING AND DECODING, DATA STORAGE APPARATUS AND METHOD FOR ENCODING AND DECODING - According to one embodiment, an apparatus for encoding and decoding includes an encoder configured to generate integrated parity data for data obtained by combining first data with second data. The encoder includes a first generator, a second generator, and a third generator. The first generator generates parity data for the first data using a first check matrix with a predetermined regularity. The second generator generates parity data for the second data using a second check matrix with a regularity that is exclusive and different from the first check matrix. The third generator generates the integrated parity data by integrating the parity data generated by the first generator with the parity data generated by the second generator. | 11-01-2012 |
Patent application number | Description | Published |
20130015784 | ILLUMINATION LIGHT COMMUNICATION DEVICE, AND ILLUMINATION APPARATUS AND SYSTEM INCLUDING SAMEAANM KAMADA; MasaoAACI OsakaAACO JPAAGP KAMADA; Masao Osaka JPAANM SHIOHAMA; EijiAACI OsakaAACO JPAAGP SHIOHAMA; Eiji Osaka JPAANM NISHINO; HiroyukiAACI OsakaAACO JPAAGP NISHINO; Hiroyuki Osaka JPAANM MAEHARA; MinoruAACI OsakaAACO JPAAGP MAEHARA; Minoru Osaka JPAANM HASITANI; YosiakiAACI OsakaAACO JPAAGP HASITANI; Yosiaki Osaka JPAANM KONDO; YosukeAACI OsakaAACO JPAAGP KONDO; Yosuke Osaka JP - An illumination light communication device includes a light source unit including light emitting elements; a power supply unit controlling a load current flowing through the light source unit to be maintained at a constant; a switch element connected in series to the light source unit; and a control unit configured to control on/off of the switch element to modulate a light intensity of illumination light from the light source unit such that a binary communication signal is superimposed on the illumination light. The control unit has a switching circuit to open/close a path between the light source unit and the power supply unit, controls on/off of the switching circuit based on a dimming signal to perform a dimming control on the light source unit by a PWM control, and allows the communication signal to be superimposed on the illumination light in synchronization with an ON time of the switching circuit. | 01-17-2013 |
20130015785 | ILLUMINATION LIGHT COMMUNICATION DEVICE, AND ILLUMINATION APPARATUS AND SYSTEM INCLUDING SAMEAANM KAMADA; MasaoAACI OsakaAACO JPAAGP KAMADA; Masao Osaka JPAANM SHIOHAMA; EijiAACI OsakaAACO JPAAGP SHIOHAMA; Eiji Osaka JPAANM NISHINO; HiroyukiAACI OsakaAACO JPAAGP NISHINO; Hiroyuki Osaka JPAANM MAEHARA; MinoruAACI OsakaAACO JPAAGP MAEHARA; Minoru Osaka JPAANM HASITANI; YosiakiAACI OsakaAACO JPAAGP HASITANI; Yosiaki Osaka JPAANM KONDO; YosukeAACI OsakaAACO JPAAGP KONDO; Yosuke Osaka JP - An illumination light communication device includes a power supply unit controlling a load current in a light source unit to be maintained constant based on a dimming signal; an impedance unit series connected to the light source unit; a switch element parallel connected to the impedance unit to connect/disconnect the impedance unit with the light source unit; and a control unit controlling on/off of the switch element to modulate a light intensity of the light source unit such that a binary communication signal is superimposed on illumination light therefrom. The control unit controls the impedance of the impedance unit such that a difference between magnitudes of the load currents respectively when the pulse of the communication signal is superimposed and is not superimposed is maintained constant regardless of a dimming rate of the dimming signal in a range of a dimming rate equal to or greater than a predetermined level. | 01-17-2013 |
20140250498 | VISIBLE LIGHT COMMUNICATION SYSTEM, COMMUNICATION TERMINAL AND SERVER - A communication module of a communication terminal is configured not to output to a control module, service information provided from a second server whose server ID is not registered in a first server. The communication module is configured to receive an authentication code from the first server, and to transmit ID information and terminal identification information to the second server. When the terminal identification information received from the communication module matches the terminal identification information received from the first server, the second server is configured to reply the authentication code and the service information to the communication module. When the authentication code received from the first server matches the authentication code received from the second server, the communication module is configured to output the service information to the control module. | 09-04-2014 |
20150263808 | ILLUMINATION LIGHT COMMUNICATION APPARATUS AND ILLUMINATION LIGHT COMMUNICATION SYSTEM USING THE SAME - An illumination light communication apparatus includes: a light source; a power supply circuit; a switching element which modulates an output current supplied from the power supply circuit to the light source; a visible light communication signal circuit which controls ON and OFF of the switching element to output a modulating signal for superimposing a visible light beacon signal including a unique ID onto the illumination light emitted from the light source; a control power supply circuit which supplies power to the visible light communication signal circuit; a wireless module which transmits a radio wave beacon signal including a unique ID; and a radio wave beacon controlling and transmitting circuit which controls the radio wave beacon signal transmitted from the wireless module, wherein the radio wave beacon controlling and transmitting circuit is supplied with power from the control power supply circuit. | 09-17-2015 |
20150295645 | VISIBLE LIGHT COMMUNICATION TERMINAL - A housing body of a visible light communication terminal houses a light receiving unit configured to receive a visible light communication signal to convert the received visible signal to an electrical signal, an output unit configured to output information obtained from the visible light communication signal, and a power supply unit configured to supply power to the light receiving unit and the output unit. An ear hooking part is curved in an arc-like shape and is attached at one end thereof to the housing body, and is configured to fit the housing body to an auricle by being hooked onto the auricle and together with the housing body sandwiching the auricle therebetween. The light receiving unit is located on a portion of the housing body on an upper side thereof in a vertical direction in a state where the housing body is fitted to the auricle. | 10-15-2015 |
20150304029 | VISIBLE LIGHT COMMUNICATION SYSTEM - A controller is configured, by decreasing light quantity in only a first slot that is any one of a plurality of slots into which a unit time is divided equally, and increasing light quantity in all the remaining slots except the first slot of the plurality of slots, to assign information to the first slot of the plurality of slots. The controller is furthermore configured to decrease light quantity in second slots that are three or more continuous slots starting from a head of a preamble, which indicates a frame start point, of a frame of an optical-communication signal and to increase light quantity in a slot immediately before the preamble. | 10-22-2015 |
20160072581 | LIGHTING APPARATUS AND POSITIONING SYSTEM - A lighting apparatus that is used in a positioning system and is locatable in plural number in a limited area is provided. The lighting apparatus for use in the positioning includes a power supplier that supplies power, a lighting unit that is lit by the power supplied by the power supplier, and a beacon transmitter. The beacon transmitter operates by the power supplied by the power supplier, and transmits a beacon that is a signal for positioning. The beacon includes a long-distance beacon transmitted with first transmission power and a short-distance beacon transmitted with a second transmission power less than the first transmission power. The beacon transmitter transmits at least the long-distance beacon intermittently. | 03-10-2016 |
Patent application number | Description | Published |
20150046764 | RECORDING AND REPRODUCING APPARATUS - According to one embodiment, a recording and reproducing apparatus includes a first masking unit configured to apply first bit masking to error correction code (ECC) encoded data using a bit sequence for masking, to generate a masked bit sequence to be recorded on a medium, and a de-masking unit configured to apply de-masking, using the bit sequence for masking, to a sequence of decision values based on a signal read from the medium to generate a sequence of de-masked decision values to be ECC decoded. The bit sequence for masking comprises an iteration of a fixed bit sequence of N (>1) bits. The bit de-masking is an inverse process corresponding to the first bit masking. | 02-12-2015 |
20150303945 | CHIEN SEARCH DEVICE, STORAGE DEVICE, AND CHIEN SEARCH METHOD - According to one embodiment, a chien search device includes n operation units configured to perform exclusive-OR operations, for each coefficient. Further, the chien search device includes first register configured to hold operation results of the highest order operation unit, for each coefficient. Furthermore, the chien search device includes exclusive-OR operation unit configured to perform exclusive-OR operations of the operation results of the highest order operation unit, for each coefficient. Moreover, the chien search device includes second register configured to hold operation results of the exclusive-OR operation unit, for each coefficient. The respective operation units reduce the number of stages of exclusive-OR operations by using the second register values, which are obtained from the second register, and perform operations. | 10-22-2015 |