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Linear synchronous motor (LSM) is used in industrial machines for positioning and conveying equipment. A variety of layout lines has been suggested to be highly expected to raise productivity. Flexible layout of the track including curved part is an advantage of the application. For example, the track shaped production lines of circular system is used to reduce the waste time that occurs during return...
The purpose of this work is to investigate the effect of ohmic electrode processing on the breakdown voltage of AlGaN/GaN HEMTs. The impact of ultrasonic cleaning condition during the lift-off process on metal edge definition was investigated. It was verified that the shape of the ohmic electrode was indeed crucial for ensuring high breakdown voltage characteristics.
In this study, the dual band characteristics of the capacitance-grid (CG)-type Artificial Magnetic Conductor (AMC) substrate are presented, it is shown that the substrate works as an AMC substrate at the dual bands separated three times.
This paper provides the dual band characteristics of the capacitance grid type AMC substrate and shows that the substrate works as AMC substrate at the dual bands separated three times.
Transmission line mode theory is used to analyze wideband/multiband small antennas consisting of several conductors. First, the modal theory is introduced with equations in order to implement the theory to antenna analysis. Eigenvalue and eigenvector matrices generated by the theoretical calculation are shown. As an example of simple analysis, ILA with a folded structure consisting of two-wire (FILA)...
This paper provides simulated results of the impedance characteristics and the radiation patterns of dipole antennas on AMC substrates with different design parameters and different substrate size.
This paper provides PMC characteristics of a capacitance grid with a metal plate and the design method using an equivalent circuit model is also provided. Measured results of very thin PMC model with the thickness of 1/150 wavelength are also provided.
A 1.3-μm-range uncooled electroabsorption/distributed-feedback (EA/DFB) laser was demonstrated. Incorporating an InGaAlAs multiple quantum well (MQW) modulator, a low-capacitance structure, and butt-joint integration, this laser successfully demonstrated 43-Gb/s 10-km transmission for the first time. The developed laser achieved clearly opened eye diagrams with dynamic extinction ratio of over 7 dB...
In this paper, we propose a query-by-humming (QbH) system that retrieves musical pieces given as audio signals. Most conventional QbH systems assume that the symbolic melody information is given a priori, which is not always true. In our system, the database for retrieval is generated from 1ch audio signal that contains many sounds. We generate the database by estimating fundamental frequencies (F0)...
There have been proposed spoken dialog systems that utilizes simple database consisted of example sentences and the corresponding reply sentences. However, it is costly to prepare this database manually. In the present study, we propose a framework in which both the example and reply sentences are automatically generated from a database description table that describes minimum information for describing...
Communication quality in IP telephony is rated in terms of the Mean Opinion Score (MOS), which is an Absolute Category Rating (ACR) scale. There is a problem when comparing subjectively evaluated MOSs in that the evaluation results are strongly affected by differences in language, the instruction words used for the evaluation, and the nationality of the evaluator. To solve these problems, ITU-T SG12...
This paper describes packet loss concealment methods for MP3 audio. The proposed methods are based on estimation of modified discrete cosine transform (MDCT) coefficients of the lost packets. The estimation of MDCT coefficients of lower dimensions is performed by switching two concealment methods: the sign correction method and the correlation-based method. The concealment methods are switched based...
Musical noise is a typical problem with blind source separation using a time-frequency mask. Recently, the cepstral smoothing of spectral masks (CSM) was proposed. Based on the idea of smoothing in the cepstral domain, this paper proposes the cepstral smoothing of separated signals (CSS) on the assumption that a cepstral representation better reflects the characteristics of speech signals than those...
Recent advances in integrated photonic devices for next-generation Ethernet are described. In particular, 1.3-μm-range uncooled photonic devices (namely, electroabsorption modulator integrated lasers, directly modulated lasers, and lens integrated devices) are focused on. A key technology for uncooled operation is an InGaAlAs multiple quantum well (MQW), which produces a strong electron confinement...
In this paper, we proposed a method of retrieving documents from the world wide Web using a spoken document as a ldquokey.rdquo This method can be viewed as a speech version of an ordinary relevant document retrieval, where a text document is used as a query of retrieval. Basically the retrieval is based on an automatic transcription of a spoken document using a speech recognizer. The difficult point...
In this paper, we propose a method to embed side in- formation into MP3 bitstream using a data hiding technique. Usually, side information is transmitted in ancillary data field of an MP3 packet, which is independent of audio bitstream. When a certain amount of side information is packed into an ancillary data field, bitrate for the audio stream become smaller if we keep the total bitrate constant,...
We developed a system that detects abnormal sound from sound signal observed by a surveillance microphone. Our system learns the ldquonormal soundrdquo from observation of the microphone, and then detects sounds never observed before as ldquoabnormal sounds.rdquo To this end, we developed a technique that uses multiple GMMs for modeling different levels of sound events efficiently. We also consider...
We have developed a high-speed electroabsorption modulator integrated distributed feedback (EA/DFB) lasers. To realize the high-speed, small-footprint, low-power-consumption and cost-effective semiconductor light source, we have investigated the several key technologies. Newly developed 1.3 mum range 25 Gbps and 43 Gbps EA/DFB laser showed a good transmission performance over 10 km single mode fiber...
In this paper, we propose a novel sparse source separation method that can be applied even if the number of sources is unknown. Recently, many sparse source separation approaches with time-frequency masks have been proposed. However, most of these approaches require information on the number of sources in advance. In our proposed method, we model the histogram of the estimated direction of arrival...
RFID usage is steadily increasing in the world, and its frequency bands are assigned in each country. RFID in UHF band is mainly used in 900 MHz band. Allocated frequency bands of Europe, the USA and Japan are included from 860 to 960 MHz. Broadbanding of the IC and antenna is needed to manage the worldwide RFID frequency band. This paper proposes broadband matching of a RFID antenna by using a T-type...
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