We are researching set partitioning 64APSK coded modulation for satellite transmission. We previously developed a constellation-design method based on channel capacity and evaluated the transmission performance under the condition that the constellation was restricted to circumferential arrangement. We confirmed that this conventional method exhibited better transmission performance than DVB-S2X. In this paper, we expanded the numbers of circle of 64APSK from four to seven. Especially, applying the number of five shows good channel capacity. We also applied the design scheme whose constellation points-assignment is not restricted to circumferential arrangement because of the free constellation points-assignment in the IQ plane. We show that the proposed 64APSK applying these design schemes achieved better transmission performance than conventional method through computer simulation under the AWGN model.

We developed a new transmission system for 8K Super Hi-Vision satellite broadcasting in Japan. This system has a transmission capacity of over 100 Mbps in a single 34.5MHz satellite transponder. The key technical feature of the new system are lowering roll-off factor to 0.03 and using 16APSK and LDPC code with a coding rate of 7/9. To confirm the transmission performance in a satellite channel, we conducted indoor transmission tests and transmission tests using Japanese communication and broadcasting satellites. This paper shows the transmission performance of this system and similar performance was obtained in indoor-transmission and satellite-transmission tests.

By making use of LDPC codes and a smaller roll-off factor, the advanced satellite broadcasting system proposed by us has a 30% higher transmission channel capacity in comparison with the current ISDB-S system. In addition, the transmission channel capacity can be more increased by using multi-level amplitude phase shift keying (M-APSK) modulation. However, the APSK signal is more sensitive to the non-linear distortion. Hence, a careful consideration for APSK should be paid for transmission over a satellite channel. In this paper, we report on adaptive equalizers that are designed for APSK transmission over a satellite channel. We also report on computer simulation results of equalized 16/32APSK performances under a satellite channel model and discuss the equalization effect for the advanced ISDB-S system transmission format.

The signal attenuation due to rain is greater in the 21 GHz band than in lower bands and this is one of the major factors limiting the availability of services in this band. A broadcasting satellite system is proposed in which phased-array antenna technology is applied to overcome the effect of rain-attenuation. Concentrated radiation beams created by a phased-array antenna cover areas of heavy rain, and the same antenna covers other areas with a spread radiation beam. We discuss the outline of this 21 GHz broadcasting satellite system and examine the major hardware elements, such as the array-fed reflector and a TWT suitable for an array configuration.

Describes an attractiveness evaluation model based on the physical features of image regions. The word "attractiveness" here means salient, which is to get the attention of viewers. The model uses the heterogeneity of regions in color, texture, shape, and size, as well as the potential attractiveness of color, spatial frequency, and size as the evaluation parameters. These parameters significantly contribute to the attractiveness in our subjective experiments. The model calculates the level of attractiveness by first merging the parameters through weighted linear combination, and then by providing the merged value to the Beta function, i.e., one of the S curve functions.

In this paper, we propose a tool for extracting composition information fi-om pictures called the Composition Analyzer.This tool extracts such composition information as the shapes, proportions, andlocations of figures, by two processes.More specifically, it first segments a picture into figures and a ground by a figure extraction method we developed.It then extracts the above composition information tirn ihe fiiures based on the Dynamic Symmetry principle.The extracted composition information is used to refine the picture, and as such, facilitates the production of multimedia for nonprofessionals.

Article Evaluating the location of hot spots in interactive scenes using the 3R toolbox Share on Authors: Andre Plante ATR Media Integration & Communications Research Laboratories, 2-2 Hikaridai Seika-cho, Souraku-gun, Kyoto, Japan ATR Media Integration & Communications Research Laboratories, 2-2 Hikaridai Seika-cho, Souraku-gun, Kyoto, JapanView Profile , Shoji Tanaka ATR Media Integration & Communications Research Laboratories, 2-2 Hikaridai Seika-cho, Souraku-gun, Kyoto, Japan ATR Media Integration & Communications Research Laboratories, 2-2 Hikaridai Seika-cho, Souraku-gun, Kyoto, JapanView Profile , Seiki Inoue ATR Media Integration & Communications Research Laboratories, 2-2 Hikaridai Seika-cho, Souraku-gun, Kyoto, Japan ATR Media Integration & Communications Research Laboratories, 2-2 Hikaridai Seika-cho, Souraku-gun, Kyoto, JapanView Profile Authors Info & Claims CHI '98: Proceedings of the SIGCHI Conference on Human Factors in Computing SystemsJanuary 1998 Pages 117–123https://doi.org/10.1145/274644.274662Online:01 January 1998Publication History 4citation259DownloadsMetricsTotal Citations4Total Downloads259Last 12 Months4Last 6 weeks0 Get Citation AlertsNew Citation Alert added!This alert has been successfully added and will be sent to:You will be notified whenever a record that you have chosen has been cited.To manage your alert preferences, click on the button below.Manage my AlertsNew Citation Alert!Please log in to your account Save to BinderSave to BinderCreate a New BinderNameCancelCreateExport CitationPublisher SiteGet Access

Recent advances in computer technology and video technology have made it easy to transmit high-volume multimedia contents. However, high-quality multimedia production requires special knowledge and techniques. We are engaged in research on an environment that can help nonspecialists to create such contents. In this paper we propose a new integrated media handling system COMI&CS (Computer Organized Media Integration and Communication System) and image expression environment IER (Image Expression Room). Those can allows people that do not have expert knowledge on the manipulation of media or the technique of expression to express their images with a high degree of freedom.

Upon viewing a picture, its audience gets an impression of that work. In this case, the picture has certain factors that can affect viewers' impressions, which in Japan are called KANSEI factors. In general, highly attractive regions of a picture have the ability to affect the majority of viewers' impressions. By extracting and analyzing those attractive regions, it becomes possible to predict viewers' impressions within a reasonable error. This paper proposes a method for extracting attractive regions of pictures for analyzing KANSEI factors. It also describes a function for evaluating attractive regions segmented from a picture based on the size and color features of those regions.

The "Phase II", a semi-automatic hot-line work robot system being developed by Kyushu Electric Power Co. Inc. (KEPCO), is designed for overhead distribution facility work in an outdoor environment. The currently developed system is able to determine the position and orientation of work objects, is targeted to increase the work range to which the hot-line work robot system is applicable. The system employs two types of two-point range measuring (positioning measurement from two points) methods. One measures the range of objects with a laser. The other is based around positioning data from the manipulators. By means of these methods, the position and orientation of work objects may be determined. This paper outlines the achievements resulting from the automation of a portion of manipulator operations made possible through these two-point measuring methods. The manipulator was conventionally operated manually in the execution of hot-line work on flexible objects such as electric wires. Parallel motion commands were incorporated into the robot by upgrading task programs and improving tools and materials, bringing about dramatic reductions in work time.