Mitsubishi Electric Corporation

Yoshihiro Akeboshi

Hiroshi Itakura

Keitaro Yamagishi

Seiichi Saito

Takashi Kuwahara

Hirokazu Nomoto

Kenji Hirose

Mitsuhiro Shimozawa

Hideyuki Ohashi

Kyota Otsuka

Tetsuro Komura

Tetsuya Nagakawa

An AD conversion device includes an AD converter that outputs an analog signal as sampling data for every sampling point based on a sampling frequency, a controller, and a storage circuit, the controller includes a buffer memory which temporarily stores the sampling data from the AD converter in time series and from which the sampling data is read out in time series, and a decimation controller, the decimation controller outputs a write-enable signal indicating write-enabled for the selected sampling data in the decimation region and the sampling data in the high-speed sampling region, and outputs decimation bit information indicating whether the sampling data is the sampling data of the decimation region or the sampling data of the high-speed sampling region, and the storage circuit stores the sampling data stored in the buffer memory in association with the decimation bit information, in response to the write-enable signal.

AD conversion device

A noise filter includes: a ground-side power supply line detecting circuit that is connected to each of a power supply line and a power supply line and detects a power supply line connected to an electrode from among the power supply line and the power supply line; and a control circuit that determines whether the power supply line connected to the electrode is the power supply line or the power supply line on the basis of a detection result by the ground-side power supply line detecting circuit, controls a relay to short-circuit between a Y capacitor and an electrical device ground when determining that the power supply line connected to the electrode is the power supply line, and controls a relay to short-circuit between a Y capacitor and the electrical device ground when determining that the power supply line connected to the electrode is the power supply line.

Noise filter

A signal compensation line includes at least one of: a first signal compensation line including a first end connected to a main line () on a side closer to a first communication device () with respect to a first connection point (-) counted from the first communication device () among connection points (-) to (-) between the main line () and respective first ends of branch lines (-) to (-), and a second end grounded; or a second signal compensation line including a first end connected to the main line () on a side closer to a second communication device () with respect to the first connection point (-) counted from the second communication device () among the respective connection points (-) to (-), and a second end grounded.

Bus system and communication apparatus

An OFDM modulation device includes a communication use specifying unit to specify a communication use of a communication frame, a header generating unit to generate a header of the communication frame in which communication use specifying information indicating the communication use specified by the communication use specifying unit is stored, a payload generating unit to generate a payload of the communication frame, and an inverse fast Fourier transform unit to generate a communication frame of time domain by executing an inverse fast Fourier transform of a size corresponding to the communication use specified by the communication use specifying unit on data of frequency domain including the header generated by the header generating unit and the payload generated by the payload generating unit.

OFDM modulation device and OFDM demodulation device

A noise detection circuit includes an open and close switch connected onto a signal line for transmitting a detection signal of an extraneous noise, and the open and close switch is configured so as to be in an off state during a time period when the switching of the conduction state of a solid state switch is performed by a control circuit, whereas the open and close switch is configured so as to be in an on state during a time period when the switching of the conduction state of the solid state switch is not performed. As a result, an extraneous noise occurring irregularly can be detected.

Noise detection device

There are included a CAN package () having a stem () and lead pins (and) protruding from the stem (), and a board () having pads (and) for connecting lead pin. The CAN package () has a slot () provided in a surface of the stem () from which the lead pins (and) protrude. One end of the board () is inserted into the slot (), and the pads (and) for connecting lead pin are electrically connected to the lead pins (and).

Optical module

Semiconductor package

A sending unit includes a send data storing unit, a sending-side signal processing unit, and a first DA converter and a second DA converter. A receiving unit includes a first AD converter and a second AD converter, a receiving-side signal processing unit, and a receive data storing unit. The sending-side signal processing unit calculates output signals using a matrix formed of eigenvectors corresponding to transmission eigenmodes in which the signals propagate through a transmission path. The receiving-side signal processing unit calculates data signals of a plurality of sequences by the inverse of the matrix used by the sending-side signal processing unit.

Signal transmission apparatus

A signal transmission device includes: a detector circuit that detects impulse noises having been applied to the transmission line, the detector circuit being composed of an analog circuit; a noise counter that counts the impulse noises detected by the detector circuit and observes occurrence intervals of the impulse noises; and a data length changer that varies a data length of the communication frames depending on the occurrence intervals of the impulse noises observed by the noise counter.

Signal transmission device with data length changer

In the analog current output circuit according to the present invention, a rising start position and a tilt of an internal control voltage are set such that it crosses, at the maximum of an analog output current, a load end voltage obtained when the resistance of a load is the one near the center of a specification range. According to a comparison result in a comparator, a switch causes a DC/DC converter to input a high reference voltage and causes an output transistor to output a high power supply voltage when the internal control voltage is smaller than the load end voltage and causes the DC/DC converter to input a low reference voltage and causes the output transistor to output a low power supply voltage when the internal control voltage is larger than the load end voltage.

Analog current output circuit

Provided is a transmission system capable of improving the SN ratio for noise superimposed on a transmission line and extending the dynamic range. The transmission system transmits a signal between a transmitter () and a receiver (), which are connected to each other via a transmission line (). The transmitter () includes a transmission amplifier () for stepping up an amplitude of an input signal. The receiver () includes: an amplitude comparison circuit () for attenuating the amplitude of the signal, which is output from the transmission amplifier () and input via the transmission line (), and comparing the attenuated amplitude and a reference voltage; a variable attenuation circuit () for outputting, when the attenuated amplitude is larger than the reference voltage, the signal input to the receiver () after attenuating the amplitude of the signal, and for outputting, when the attenuated amplitude is smaller than the reference voltage, the signal input to the receiver () without attenuating the amplitude of the signal; and an amplitude limiting circuit () for clipping the amplitude of the signal output from the variable attenuation circuit () at a threshold voltage.

Growing community of inventors

Tokyo, Japan

Yoshihiro Akeboshi