Nec Corporation

Nec Home Electronics, Inc.

Kaoru Endo

Mikio Sugiyama

Soichi Tsumura

Naomichi Takahashi

A data processing apparatus including a waveform data acquisition unit which acquires waveform data of a consumption current and/or a voltage of a target device, a feature value extraction unit which extracts a waveform feature value from the waveform data, an environment data acquisition unit which acquires environment data indicating an environment of the target device at the time when the waveform data is acquired, an operation state data acquisition unit which acquires operation state data indicating an operation state of the target device at the time the waveform data is acquired, a distance calculation unit which calculates a distance between each of members including the waveform feature value, the environment data, and the operation state data, and each of a plurality of reference members, a grouping unit which groups the members, and a registration unit which registers a group satisfying a predetermined condition as training data.

Data processing apparatus, data processing system, data processing method, and non-transitory storage medium

A rewritable read only memory (ROM) file device having a special area storing a directory, a file allocation table, and a rewritable area. An access controller copies the content of the special area into a buffer by an initialization process. After the initialization process, the access controller converts subsequent access requests to the special area of the ROM file device into an access to the buffer. The access controller detects a termination of a use of the ROM file device and, in response, returns the data stored in the buffer to the device's special area.

Rewritable ROM file device having read/write buffer access control via

A CSK modulation is applied to transmit input data for transmission by using N PN code series. A modulator for N series synthesizes a predetermined number (n) of PN code series selected from N PN code series in response to m bits in the input data, and the synthesized code series is transmitted onto a transmission medium through a transmitting interface. The PN code series which is actually transmitted has a maximum value of the absolute magnitude of auto-correlation which is always greater than a maximum value of the absolute value of cross-correlations between the remaining synthesized PN code series.

CSK communication system and method for spread spectrum communication

A data browsing apparatus displays data automatically in an automatic page-turning mode. The data browsing apparatus has dynamic picture display parameters comprising a frame display time (w), a frame display pitch (m), and a display priority (r). The dynamic picture display parameters may be calculated based on automatic page-turning options designated by users. Dynamic pictures are displayed with accuracy at the automatic page-turning interval.

Data browsing apparatus and method therefor including automatic

Before dither-processed data are input to a compression processing section, dither-processed data of a previous frame and dither-processed data of a current frame are subjected to inter-frame differential processing in a differential processing section to form signal series having long white and black run length for the data input to the compression processing section, thereby enhancing the compressibility. A coding control section for performing coding processing beforehand sets a flag for determining whether each of the dither processing, the differential processing and the compression processing is performed. Each processing is performed on the basis of the flag information.

Moving picture coding apparatus

The present invention provides new arrangements for various components of a CSK communication system: modulator, correlators, demodulator, carrier detection circuit, and synchronization control circuit. The various improvements provide more accurate demodulation of data from the received signal in the presence of noise and signal deterioration. A modulator configuration permits the CSK system to use two M series codes in which the second code is simply a phase shifted version of the first code. The PN correlators, via shift-registers, efficiently output two correlation signals. The demodulator accepts two correlation signals from the correlators, detects auto-correlation peaks in the correlation signals, and uses the peaks to accurately determine whether the received bit has a value of '1' or '0'. The carrier detecting circuit detects the presence of data in the received signal. A carrier detecting circuit conveniently allows demodulation of data without exact synchronization of the center of demodulator's monitoring window to auto-correlation peaks. The synchronization control circuit generates accurate timing pulses that mark the start and end of each data bit. If auto-correlation peaks appear consistently in one location for the duration of N consecutive data bits, subsequent timing pulses are delayed in accordance with weighted averages of the stored locations of auto-correlation peaks. In one embodiment, separate correlation signal monitoring windows for demodulation and synchronization tracking may be set independently of each other, enabling the demodulator to clearly distinguish between an actual auto-correlation peaks and an inter-correlation peak, and the synchronization control circuit to attain stability by 'averaging' out temporal effects of noise.

CSK communication system

This invention is directed to various improvements in spread spectrum power line communications. One aspect of the invention relates to collision avoidance between varius 'slave' unit transmitters trying to send messages to a single 'master' unit receiver by detecting whether the transmission path is in use and refraining from transmitting if it is. Other aspects of the invention relate to controlling the frequencies of spread spectrum data messages transmitted, using gold codes to identify the slave units, and switching frequency bands on the powe line to avoid frequencies where there has been a deterioration of transmission. In each embodiment, the signal modulated over the power line is modulated by a signal which is synchronous with A.C. power flowing through the power line used for communications. The transmitted spread spectrum modulated signal then may be demodulated to isolate the transmitted data even when changes in the transmission characteristics of the power line (due to load changes and the like) occur.

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Tokyo, Japan

Kaoru Endo