Panasonic Corporation

Matsushita Electric Industrial Co., Ltd.

Panasonic Intellectual Property Management Co., Ltd.

Tsutomu Niiho

Kouichi Masuda

Hiroyuki Sasai

Mariko Nakaso

Hiroaki Yamamoto

Osamu Shibata

Kuniaki Utsumi

Masaru Fuse

Yoshiyuki Saito

Kenji Miyanaga

Tomoaki Ohira

Takuya Matsumoto

Hiroyuki Yagyu

Kazuo Tanaka

Yasumichi Takai

Tadahiro Yamaji

Yutaka Kinugasa

Chie Sasaki

Nobuyuki Asashi

Fumio Fujisaki

Kuniharu Itakura

A transmitter apparatus is provided with a first multi-value signal generator to convert the non-video signal of natural number 'a'&#xd7;natural number M bits other than a video signal into a multi-value signal of a multi-value number 2and to output a resulting signal, a second multi-value signal generator to convert the video signal of natural number 'a'&#xd7;natural number N bits into a multi-value signal of a multi-value number 2larger than the multi-value number 2and to output a resulting signal, and a transmission driver circuit to transmit the multi-value signal of the multi-value number 2in at least partial time interval of a blanking time interval and to transmit the multi-value signal of the multi-value number 2in an active time interval.

Transmission system for transmitting high-resolution video signal by performing multi-value transmission changing in amplitude direction

A signal transmitting connector of the present disclosure includes a connection terminal portion comprising a terminal that executes at least one of outputting of an electric signal to an external device or inputting of the electric signal from an external device, a connector portion comprising a photoelectric converting portion that executes photoelectric conversion between an optical signal and the electric signal, and a cable holding portion that holds an optical fiber transmitting the optical signal, the cable holding portion comprising one or a plurality of cable holding portion mirror(s) each forming an optical path between the optical fiber and the photoelectric converting portion.

Signal transmitting connector, cable having the signal transmitting connector, display apparatus having the cable, and video signal output apparatus

A switch is inserted and connected between a first portion and a second portion of an HPD line. The switch connects the first portion to the second portion when an HPD signal is outputted to the second portion. The switch cuts off the connection between the first portion and the second portion when the HPD signal is not outputted to the second portion. An AND gate generates a connection state detection signal that represents the connection state of an HDMI optical active cable, and outputs the connection state detection signal to a switch.

Communication cable apparatus including switch turned off in reverse connection state of communication cable apparatus

Disclosed is an optical module which improves optical coupling efficiency either when configured to receive an optical signal from an optical fiber with a light receiving element or when configured to receive an optical signal from a light emitting element with an optical fiber. The optical module includes: a substrate () having in the surface thereof a first groove () and a second groove () formed, with this second groove () being configured to have a substantially V-shaped cross section formed deeper than the first groove and being formed in continuation from the first groove; and an internal waveguide () provided within the first groove () of the substrate (). The optical further modules a mirror portion () for changing an optical path, provided at the front end of the first groove (); an optical element () mounted on the surface of the substrate () so as to face the mirror portion (), and configured to emit an optical signal to a core () of the internal waveguide () via the mirror portion (). Moreover, the optical module further includes an optical fiber () having a fiber cladding () placed within the second groove () and a fiber core () optically connected to the core () of the internal waveguide ().

Optical module

A transmission device includes a first light emission unit having a light source for emitting one optical signal. A reception unit includes an X-Y address system image sensor, having a pixel region including a plurality of pixels, for receiving the optical signal by the pixel region; a classification unit for creating classification information representing a pixel group including pixels, among the plurality of pixels, which are irradiated with the optical signal; and a control unit for controlling the X-Y address system image sensor in accordance with the classification information to simultaneously read signals of the pixels belonging to the pixel group.

Optical space transfer apparatus using image sensor

An optical modulator comprises an electrodewhich applies to an optical waveguidesof a Mach-Zehnder type optical interference system a first electric signal based on an alternating current signal Sand a direct current bias V, an electrodewhich applies to an optical waveguideof the Mach-Zehnder type optical interference system a second electric signal based on an alternating current signal Sand a direct current bias V, and a bias setting sectionwhich sets average direct current levels of the first and second electric signals based on signal frequency information Dwhich indicates a magnitude relation between a maximum frequency of the alternating current signal Sand a maximum frequency of the alternating current signal S

Optical modulator and modulation method

A SW () receives an Ethernet&#xae; signal from an outside of areas E and F. The SW () selects and outputs the obtained Ethernet&#xae; signal to any one of APs (to) in accordance with a network structure managed by the SW (). The AP (to) converts the Ethernet&#xae; signal to an electrical signal type wireless LAN signal, which is in turn output to a main station (). The main station () frequency-multiplexes the signal output from each of the APs (to), and converts the signal to an optical signal, which is in turn output to sub-stations (and). The sub-station (and) transmits the signal transmitted from the main station () to a terminal in the form of a wireless radio wave. Thereby, when a plurality of communication areas are present, the accommodation capacity of an AP can be effectively utilized in each communication area.

Method and system for extending coverage of WLAN access points via optically multiplexed connection of access points to sub-stations

Provided is a multimode optical transmission system capable of reducing an influence of multimode dispersion occurring when an optical signal is transmitted in multimode. Light sources (to) respectively convert inputted electrical signals into a plurality of optical signals respectively having different wavelengths, and respectively output the plurality of optical signals. A wavelength multiplexing section () performs wavelength multiplexing of the plurality of optical signals outputted from the light sources (to), and outputs a resultant signal as a wavelength multiplexed signal. A multimode optical transmission path () optically transmits the wavelength multiplexed signal in multimode. A mode processing section () extracts, from the wavelength multiplexed signal transmitted through the multimode optical transmission path (), a plurality of optical signals each being in a mode having a particular wavelength and a particular propagation constant. Optical receiving sections (to) receive the plurality of optical signals having been extracted, and convert the received optical signals into electrical signals.

Multimode optical transmission system and multimode optical transmission method

A wireless communication system capable of keeping a level of a wireless signal received by a relay apparatus within a predetermined dynamic range. In a control apparatus, a transmitting section converts a downstream electric signal into a downstream optical signal and transmits the downstream optical signal to the relay apparatus via an optical transmission path. The relay apparatus converts the received downstream optical signal into a downstream electric signal and transmits the downstream electric signal as a wireless signal to a wireless communication terminal from a transmitting/receiving antenna section. In the relay apparatus, a level adjustment section adjusts the level of the wireless signal transmitted by the relay apparatus such that the receiving level of the wireless signal received by the relay apparatus is kept within a predetermined range.

Wireless communication system

A multimode optical transmission system reduces a deterioration of a noise characteristic and a distortion characteristic caused by an interference between modes. In an optical transmitter, a signal output section outputs a predetermined signal based on an inputted electrical signal. A control section controls the signal output section so as to adjust a frequency component of the signal outputted by the signal output section based on group delay information of modes which propagate in a multimode optical transmission line. An electric-optic conversion section converts, into an optical signal, the signal outputted by the signal output section, and transmits the optical signal via the multimode optical transmission line.

Multimode optical transmission apparatus and multimode optical transmission system

A wireless access system is provided which prevents the occurrence of a hidden terminal problem and minimizes the reduction in throughput. In the wireless access system, an access point divides terminals into groups such that terminals in one group cannot recognize radio waves sent from terminals in another group, and performs communication with the terminals on a per-group basis. By this, the wireless access system avoids the occurrence of the hidden terminal problem. RTS/CTS packets used to avoid the occurrence of the hidden terminal problem are exchanged between the access point and the terminals on a per-group basis, whereby overhead is reduced and the reduction in throughput is minimized.

Wireless access system

A light emitting section outputs an optical signal having an intensity corresponding to a transmission timing signal, the optical signal modulated based on a radio transmission signal. A received photocurrent detection section detects an intensity of an optical signal received by a light receiving section. In accordance with the detected intensity, a high frequency amplification section amplifies the output signal of the light receiving section, and a transmission timing signal reconstruction section reconstructs the transmission timing signal.

Growing community of inventors

Osaka, Japan

Tsutomu Niiho