BS Digital Broadcasting will start in December 2000 in Japan. It will be able to broadcast HDTV programs and provide various data services. This paper describes newly developed hardware and software in out BS Digital Broadcast Decoder, fully compliant with ARIV-standard.

View full abstract

B-SAT and NHK have been constructing the BS Digital Up-Link Sub Station in the Shobu-Kuki medium wave Radio Station. This Facility was needed some countermeasures against the medium wave high field strength conditions. This paper describes the countermeasures of medium wave EMI for the BS Digital Up-Link Sub Station.

View full abstract

For the starting BS digital broadcasting service in december, NHK(Japan Broadcastin Corpration) is currently making prepration for necessary facilities. This paper describes the design concept and structure of BS digital master control system.

View full abstract

This paper describes structure of encoder and multiplexer system of BS digital broadcasting services by NHK. It multiplexes HDTV, SDTV, and LDTV and other multimedia services. The output transport streams are synchronized with the transmission clock in Uplink Center. It also has redundat system for high reliability and easy maintenance.

View full abstract

A new digital broadcasting service via Broadcasting Satellite (BS) including HDTV programs and multimedia data services is to be launched in December 2000. This paper describes the system configuration and applications of SI/EPG Server. This is designed for hight reliability, making the provision of real-time, flexible services possible.

View full abstract

Digital data broadcasting service is an important feature for digital broadcasting. This paper introduces an outline of multumedia digital data broadcasting service equipment for digital broadcasting services.

View full abstract

DBS uplink center receives MPEG-TS program signals form consgnors, then it transmits them to satellite as 17 GHz band feeder link. This paper describes an outline of the equipments in the uplink center that we are currently developing.

View full abstract

A multiplex and transmission system is a unique segment in BS digital feeder link center currently under construction. This paper introduces the system architecture and its redunant system that enables seamless switching between redundant units for stable and reliable operation.

View full abstract

[in Japanese]

View full abstract

This paper describes the results of field transmission experiments of TMCC(Transmission and Multiplexing Configuration Control) signal for ISDB-T in mobile condition. The transmission performance of TMCC is required to be superier to that of program signals. The results show that the TMCC decoding by using five all carriers is suitable for sufficient perfomance in mode 1 of the narrow band ISDB-T system.

View full abstract

[in Japanese]

View full abstract

This report describes a development of LSB Filter and Delay Corrector for Digital/Abalog TV Simulcast. Recently, terrestrial digital TV broadcast have started in Europe and USA and so on. During analog TV broadcast is perfactly shifted to digital TV, TV broadcast simulcast. Therefore, we must consider that each transmitter specification is not influenced among analog/digital channel, especially when digital channel next to analog channel. So, the development has been accomplished to correspond to analog/digital TV simulcast.

View full abstract

The impedance and radiation characteristics of Two-Cirulaar Loop antena (TCLA) with finite reflector have been investigated. It is found that more broad bandwith and easy impedance control than standard one by the feed line bent while the radiation pattern remain similar to those of stand TCLA. Moreover, the calulated results in the situation of being fitted up 4 frames steal tower with TCLA for TV broadcasting is described.

View full abstract

In this paper, simplified IFFT method is proposed for SFN relay station coupling canceller system. For digital broadcasting system such as ISDB-T system, pilot carriers are transmitted together with data carriers, so that the channel transfer function is estimated both in frequency and in time. Then the channel estimation over all carriers is performed by interpolation of the channnel transfer function of pilot carriers. In a SFN relay station, the estimated channel information of all carriers is transformed into time domain using IFFT in order to cancel the coupling in real time. proposed simple IFFT reduces the hardware complexity and processing time, while guaranteeing the system performance.

View full abstract

In this paper, the ISDB-T SFN relay station coupling canceller with conventional and new proposed methods is studied in multipath channel. The new proposed method, Channel Pre-estimation (CPE), improves the system performance greatly and outperforms the conventional method. The repeater using CPE has faster convergence rate and workd in a deeper frequency selective fading.

View full abstract

[in Japanese]

View full abstract

[in Japanese]

View full abstract

OFDM(Orthogonal Frequency Division Multiplexing) is an efficient modulation method for the digital terrestrial broadcasting. The proposed method is an error correction technique applied to OFDM with frequency0selective interference. In order ti detect interferences, the method use cariance of each carrier between received data and hard decision data. This method can be applied to any modulation format and any coding rate.

View full abstract

[in Japanese]

View full abstract

[in Japanese]

View full abstract

As HDTV broadcast technology has progressed, systems for transmitting HDTV program material have become increasingly important. We have developed experimental QAM-OFDM modem. That modem can transmit high-bit-rate data such as HDTV signals under the multi-path fading environments. This paper describes outline of the modem and indoor experimental results.

View full abstract

BML standing for Broadcast Markup Language is the new digital data broadcasting scheme,adopted by the Japanese government and developed by ARIB, based on W3C technology. In this paper, an implementation study of the BML browser using Java is discussed and some evaluation results on that are slso shown.

View full abstract

[in Japanese]

View full abstract

In Digital Broadcasting including Data Broadcasting, we propose "Server Model Broadcasting". In this system by transmitting the Metadata the receiving terminals partly replaces and controls the data. Therefore the receiving terminals can efficiently record the TV programs and the related data.

View full abstract

The author proposed the use of 30P/60I' pictures as "Common Intermediate Scan Format" for the fusion of, and/or, the easy conversion between various TV formats,i.e., interlaced scan and prograssive scan. Thisis now under eager discussion in the USA for post-production(though 24P instead of 30P is currently a main target) and called "segmented Frame". In this paper, desirable formats are discussed for the future TV systems, from these view points.

View full abstract

The MPEG-2 MP@HL decoder LSI has been developed for Japanese BS digital broadcast and US terrestrial digital broadcast. It can handle 1 HDTV and 1 SDTV, or 4 SDTV simulataneous decoding, and also have a decoding capability for seamless switching. The BS digital broadcast receiver is realized with 8-PSK demodulator LSI, this MPEG-2 decoder LSI and back end processing LSI which consists of video signal processor and graphics processor.

View full abstract

We have developed a LAn(Local Area Network) camera. The LAN camera can connect LAN with Ethernet 10/100BASE-T. The Lan camera transmits Ethernet pachet formed JPEG encoding image data.

View full abstract

A COMS programmable gain amplifer(PGA) with analog white balancing is presented. The PGA enhances the SNR of video interface using a 10 bit A/D converter, compared with the digital domain white balancing. The floating point expression for auto-iris gain and white balance gain is employed for low-power and area-efficient design. A prototype chip with 0.6um COMS is implemented and successful operations of gain control and white balancing and confirmed.

View full abstract

We developed the system for electric power reducation of TV seto in standby

View full abstract

This Paper describes digital signal processing system enabling correct detection of synchronization pattern contained for ttransmission in n-bit data and also correct data demodulation. This system is able to achieve LSI integration with low power dissipation, and applied to high performance DVD digital signal processing LSI for high speed DVD drive.

View full abstract

We have developed a new method for faster digital signal processing of DVD-ROM dirives by simultaneous an error checking and error correction in data blocks with Error Detection Codes. We have achieved 23% time reduction in the data processing and 30% inprovement in the data transfer rate.

View full abstract

We studied the broadcast service using the Home Server reflecting the intention of the TV audience that is gotten via the Internet. As an example, we propose the rebroadcast service that uses the Internet and EPG(Electronic Program Guide). A TV viewer operates a rebroadcast demend on EPG, and this demand is uploaded to a broadcasting station via the Internet. A TV viewer receives EIT(Event Information Table) of the program that relevant to its demand using the TV viewer's action. The broadcasting station can provide the program reflecting the intention of the TV audience.

View full abstract

Downloadable software broadcasting systems are discussed, using internet channel to download functionalsoftware for reciever, where these functions for each service presentation of program are flexibly changed without replacing the receiving hardware as a common receiver platform.

View full abstract

With the survey data of an audience rating, we conducted the statistical comparison of the transmiting schemes in software downloading on BS Digital broadcasting, in terms of ratio of successfully downloaded receiver and transmission efficiency.

View full abstract

This paper proposes an inter frame lossless shape image coding method based on the contour direction vector expression. Motion vectors are detected by the matching method for the contour direction vectors. After wavelet transform, the contour direction vectors are encoded by the arithmetic coding. The simulation result shows that the proposed method is more efficient than that of MPEG-4.

View full abstract

This paper proposes an efficient moving picture coding based on region segmentation from the viewpoint of rate-distortion. Region is decided using codeing performance of motion estimation and orthogonal transform. As a result of applying this method to test images, we found that the coding performance increased about twice compared to the method which appliying MPEG-2 TM5.

View full abstract

In this paper, the authors propose an objective picture quality measurement method in the absence of reference pictures. The proposed method assumes TV transmission chains - especially tandem connection of codecs, and enables an automatic objective measurement of the picture quality. In the proposed method, invisible markers are embedded inti original pictures by use of spread spectrum data-hiding method and the picture quality is estimated by using the detectioni rate of the maekers. Computer simulation experiments show that the proposed method provides highly accurate estimation of RSNR while retaining the degradation by inbisible markers negligible.

View full abstract

The authors examined the psychological effect from images on a wide curved screen by subjective and objective assessments. The amount of the psychological factor "potency" wa found to enlarge with increase of the screen size, from the results of the subjective assessment. This is consistent with the formaer result using flat screens. The magnitude of the induced effects to the body sway from the objective assessment was found to be similar to that of the factor "potency".

View full abstract

Integral Photography(IP) is a technology for creating autostereoscopic images. The resolution of IP display has been studied. We studied the overall response of IP including the effect of the lens-array in pickup. The principle to take the IP image of the subjects, which are distributed widely toward the depth direction, without resolution degradation, is discussed.

View full abstract

This paper describes an on-board large-scale phased array antenna for broadcasting satellite that compensates for rain-fall attenuation by increasing only the e.i.r.p. of rain-fall areas. The radiation pattern of the antenna is varied according to the distribution of the rainfall. The antenna requirements and configurations are shown. The design method of the array-fed large-scale reflector antenna is presented.

View full abstract

This paper describes aperture field patterns in the rain attenuation compensable advanced broadcasting satellite system with an on-board large-scale phased-array anntena. We assumed a restriction curve of PFD(power flux density) outside of the service aria and some aperture field patterns which follows typical window functions. The allowable maximum PFD curve in the restriction was calculated

View full abstract

A method for compensation of rain attenuation in necessary in more reliable next-generation broadcasting satellite systems. A study of transponder output power ti compensate rain attenuation is very important to achieve high reliability. First, we estimated the maximum one-minute rain rate in a 10-minute-raifall that can be easily surveyed in Japan. We calculated the additional transponder output power needed by a next-generation broadcasting satellite to compensate for rai attenuation. The rain-event coverage rate od this system was then calculated by using the AMeDAS 10-minute-rainfall data for 1300 throughout Japan.

View full abstract

This paper describes the measurement system of delay waves for OFDM with spectrum analyzer and personal computer. The system calculates D/U and delay time od delay waves by using IFFT processing of OFDM spectra data.

View full abstract

To investigate adjacent-channel interference with digital TV in mobile reception, the measurements on instantaneous field strength of digital/analog TV ware carreied out in Hokuriku district using the experimental facility. Looking upon a field strength retio as a DU ratio, 96% of mobile reception data satisfied the required DU retio of 24dB under the condition when the digital wasa transmitted 10dB lower than the analog channel co-using a transmitting antenn. It is also show that there in no co-relation in field strength fluctuation between adjacent channels in mobile reception.

View full abstract

This paper describes the results of indoor experiments for mobile reception of digital terrestrial broadcasting. Distribution of field strength in mobile reception in urban area is very similar to that of GSM Typical Urban Area model. We used this model as the typical propagation model in urban area, and measured required C/N in mobile reception. Experimental results show that the fading margin is about 6dB in the case of DQPSK with 1/2 inner code in the range that maximum Doppler frequency is from 5Hz to 80Hz.

View full abstract

[in Japanese]

View full abstract

We have developd a CS/C transmodulator for CS/S transmoduration system which transmits broadcast signal from Communication Satellites to CATV network, economically. This CS/S transmodurator includes a CS tuner, PSI processing, PID filtering, QAM modulator, and UPconvertor.

View full abstract