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Toshimitsu Watanabe, Michitaka Ohsawa, Eiji Takagi, Ikuo Yuki, Tetsuo ...
Article type: Article
Pages
95-96
Published: July 28, 1991
Released on J-STAGE: October 02, 2017
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In a projection TV system, γ- characteristics of the blue phosphor is lower than that of red and green phosphors. For the blue CRT, we correct the nonlinearity of the blue brightness using inverse γ- correction circuit. As a result, high fidelity white can be reproduced stablly.
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Ikuya Arai, Kooji Kitoo, Michitaka Ohsawa, Yoshitaka Tajimi, Akiyoshi ...
Article type: Article
Pages
97-98
Published: July 28, 1991
Released on J-STAGE: October 02, 2017
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A new type multi-scan display monitor with micro processor has been developed. This micro processor system provides easier adjustments of the raster size and position. The another features of this system are a pincushion distortion and focusing performance of multi-scan display monitor. They are equal to conventional single-scan display monitors.
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Masaki Kawasaki, Ritsuzi Okayasu, Yasuyuki Shibuta, Masasi Muramatsu
Article type: Article
Pages
99-100
Published: July 28, 1991
Released on J-STAGE: October 02, 2017
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A mini CRT with a double-neck-diameter bulb structure has been developed to realize both high resolution and low deflection power. This CRT is in an extensive use for "Single Hand Movie".
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Hidenori Sato, Renshi Morooka, Akio Senju
Article type: Article
Pages
101-102
Published: July 28, 1991
Released on J-STAGE: October 02, 2017
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We report the new type of Deflection Yoke. It is HSP type for highresolution and high performance DY.
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Article type: Appendix
Pages
103-
Published: July 28, 1991
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Article type: Appendix
Pages
105-
Published: July 28, 1991
Released on J-STAGE: October 02, 2017
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Hidetoshi MISHIMA, Yoshiko HATANO, Ken OHNISHI, Miyoichi WATANABE
Article type: Article
Pages
107-108
Published: July 28, 1991
Released on J-STAGE: October 02, 2017
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This paper describes a study on coding control about variable length coding scheme for digital VTR. We present two control methods. The first method is the control for overflow of data-length, the second is for vacant data-space. Data length after coding is fixed under coding control in every data unit.
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Osamu Saito, Satoru Okamoto, Kaoru Adachi, Mikio Watanabe, Kenji Ito, ...
Article type: Article
Pages
109-110
Published: July 28, 1991
Released on J-STAGE: October 02, 2017
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A signal processing algorithm for the digital still camera has been developed which provides color space conversion, memory control, DCT compression, and memory card interface. The algorithm is realized by 5 sets of LSI which achieve compact and low power circuit.
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Yoshihiro Okamoto, Hisashi Osawa, Kiyoshi Takigawa, Kazuo Ono
Article type: Article
Pages
111-112
Published: July 28, 1991
Released on J-STAGE: October 02, 2017
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The performance improvement by write equalization and partial response (PR) system is studied. The code sequence after write equalization used here is dc-free. The PR system as a read equalization is assumed. It is shown that at a bit-error rate of 10^<-4> the proposed method saves SNR by about 0.8dB compared with the conventional integrated equalization and NRZ code.
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Takao INOH, Yoshihisa SAKAZAKI
Article type: Article
Pages
113-114
Published: July 28, 1991
Released on J-STAGE: October 02, 2017
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We estimated a new equalization method for 8/14 Modulation in high density recoding. This method is verified error function ε(n), SNR became 4dB better than conventional method with 2.1μm^2/bit.
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Junko NAKASE, Nobukazu DOI
Article type: Article
Pages
115-116
Published: July 28, 1991
Released on J-STAGE: October 02, 2017
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Independent reset method for syndrome generation, error location/evaluation and correction blocks of Reed-Solomon decoder is studied. Miss-correction rate is enhanced from 10^<-9> to 10^<-20> using this method.
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Naoto YAMAMOTO, Katsuya OHSHIMA, Satoshi ITOI
Article type: Article
Pages
117-118
Published: July 28, 1991
Released on J-STAGE: October 02, 2017
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We proposed new method of Viterbi decoding for (1,7) code, that is 4-state Viterbi using correlation of (1,7) code. We estimated error probility by computer simulation, and got better probability with 4-state Viterbi decoding than bit-by-bit decoding.
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Tooru SETOYAMA, Nobukazu DOI
Article type: Article
Pages
119-120
Published: July 28, 1991
Released on J-STAGE: October 02, 2017
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A modulo operation in data shuffling has been studied. This can shuffle data on real time for various digital VTR formats and can decrease size of the shuffling circuit compared with the ROM look-up-table method.
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Nobuyoshi Kihara, Kousou Takeuchi, Takafumi Ueno, Hideshi Taki, Tadash ...
Article type: Article
Pages
121-122
Published: July 28, 1991
Released on J-STAGE: October 02, 2017
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The 1/2" composite digital VTR conforming to NHK standard has been commercialized. It has manipulation similar to analog audio in slow speed playback, and has X-Fade/V-Fade editing, pre-read editing with X-Fade, and mixing using digital signal processing.
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Akio Murata, Haruo Ohta, Masaaki Kobayashi
Article type: Article
Pages
123-124
Published: July 28, 1991
Released on J-STAGE: October 02, 2017
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It is shown that the decrease in signal level with higher azimuth angle can be calculated by means of some approximate expressions which have been reported. And the calculation method of the optimum azimuth angle in the digital video recording system is described.
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Hiroaki Shimazaki, Yoshikazu Katoh, Masamitsu Ohtsu
Article type: Article
Pages
125-126
Published: July 28, 1991
Released on J-STAGE: October 02, 2017
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Some experimental D-VTRs had recording bandwidth which is 3 times as wide as Nyquist frequency, but no paper shows how wide requisite recording bandwidth is. In this paper, an experimental study on degradation of SNR caused by bandwidth limitation of recording current is described.
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E. Nakatsu, H. Shimazaki, H. Ohta, M. Kobayashi, Y. Nagaoka
Article type: Article
Pages
127-128
Published: July 28, 1991
Released on J-STAGE: October 02, 2017
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A new QAM(Quadrature Amplitude Modulation) recording technique developed for digital VCRs is reported here. By using an improved coded 16-QAM method, a recording density as high as 0.92μm^2/bit is accomplished on a metal evaporated tape.
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Daisuke KISHIMOTO, Takashi ONAKA, Yoshinobu NISHIKAWA
Article type: Article
Pages
129-130
Published: July 28, 1991
Released on J-STAGE: October 02, 2017
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This study deals with the dependence of a byte error rate on the S/N ratio for a metal powder tape (MP) and a metal evaporated tape (ME). We found that the error rate of the ME was smaller than that of the MP for the same S/N ratio. The byte error rate between 10^<-6> and 10^<-7> was obtained using the ME and a sendust sputtered head with 5μm track width of the 0.7μm recording wavelength.
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Eiichi TAKAKURA, Masaru YOSHIDA, Takayoshi YAMAGUCHI, Hidetaka YASUE, ...
Article type: Article
Pages
131-132
Published: July 28, 1991
Released on J-STAGE: October 02, 2017
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Using a computer simulation system newly developed for the purpose of investigating the picture quality reproduced by various signal processing methods and tape transports for digital VCR, the reproduced picture quality in the variable speed mode of a virtual tape transport for MUSE digital recording is studied. This paper describes the structure of the simulator and some results obtained by a recent simulation.
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Sadayuki Inoue, Hideki Kaneko, Hiromi Takao, Toshifumi Fujii, Michiyas ...
Article type: Article
Pages
133-134
Published: July 28, 1991
Released on J-STAGE: October 02, 2017
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A new method has been developed to realize a variable speed playback for multi-segment VCRs. The main subject of this method is a tape speed selection. The noiseless picture has been confirmed in the 1/2" HD-VCR at a variable speed playback.
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Kunihiro Nunomura, Katuyuki Watanabe, Tomomitsu Kuroyanagi
Article type: Article
Pages
135-136
Published: July 28, 1991
Released on J-STAGE: October 02, 2017
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We have studied an adaptive non-linear signal processing system for consumer VCR, which improves both sharpness and signal-to-noise ratio. The new system varies its transmission characteristics according to average picture level and noise level.
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Takeshi Ootsuka, Tokuji Kuroda, Shinichi Aki, Sachio Hiratsuka
Article type: Article
Pages
137-138
Published: July 28, 1991
Released on J-STAGE: October 02, 2017
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Description about the method of time base correction by independent process of chrominance and luminance, and the development of the I.C. for velocity error detection. Falling achievement was made as the result. 1.Improvement of Y/C timing accuracy. 2.Lower power consumption, smaller in size and lighter in weight.
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Koichi Ono, Kenji Ichige
Article type: Article
Pages
139-140
Published: July 28, 1991
Released on J-STAGE: October 02, 2017
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We have developed a time base corrector(TBC) to improve picture quality of consumer VCR. The TBC employs a digital time-base-error detector and an interpolation filter to remove high frequency jitter. Further, vertical filtering of time-base error is employed for low S/N signal to suppress false jitter.
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Akiyoshi HIRANO, Shin-ichi SEKI, Hiroshi YAMAKI, Yoichi MASUBUCHI, Tak ...
Article type: Article
Pages
141-142
Published: July 28, 1991
Released on J-STAGE: October 02, 2017
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In S-VHS VCR, color signal is complecatedly modulated. So, it is very difficult to consider the color interference by the signal reproduced by the pseudo gap in MIG head. In this thesis, the said interference has been analyzed by simulation. Moreover, the relation between the pseudo gap signal and the color interference is explained.
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Akihiro Maeda, Katsuyuki Himejima, Takasi Ninomiya, Yositeru Okamoto
Article type: Article
Pages
143-144
Published: July 28, 1991
Released on J-STAGE: October 02, 2017
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We have developed laminated thin-film heads that adopts an Fe-Al-Si alloy film made by Electron beam deposition. With this head we have greatly improved picture quality of Ep mode. In this paper we have proved the improvement effect of this heads by comparing with MiG heads
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Tadashi Kunihira, Yoshifumi Yanagawa
Article type: Article
Pages
145-146
Published: July 28, 1991
Released on J-STAGE: October 02, 2017
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A new dynamic tracking system has been developed, which can record using moving heads, one position senser and a reference plane by positioning control. In this system, a relative height error between moving heads is much the same fixed head system and linearity error is supressed by compensational pattern.
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Masato Nagasawa, Eiji Yokoyama, Kihei Ido, Yoshinobu Ishida
Article type: Article
Pages
147-148
Published: July 28, 1991
Released on J-STAGE: October 02, 2017
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This paper proposes a method of new tracking control system for narrow track digital recording. We have developed wide band dynamic tracking system, using voice coil actuator to move the heads, as well as an observer to suppress the mechanical resonance As a result, the tracking of the recorded patterns at 6μm track pitch was realized. Moreover, a method for implementing the servo pilot signal in 12-15 modulation code was developed.
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Ryuuta Kawanaka, Tomoji Matsui, Takayuki Mitomi, Toshiyuki Katagiri
Article type: Article
Pages
149-150
Published: July 28, 1991
Released on J-STAGE: October 02, 2017
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Auto-tracking System for UNIHI-VTR has been developped. This system can adjust best-tracking considered track-segment, track-curve and difference of head-hight by microprocessor.
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Naoyuki Tanabe, Kenichi Asada, Tetsuya Yamamoto, Toshiyuki Katagiri
Article type: Article
Pages
151-152
Published: July 28, 1991
Released on J-STAGE: October 02, 2017
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Tension-servo System for UNIHI-VTR is discussed. We showed that tape damage caused by Lo/UnLo function depends on the tape-tension, and showed that closed-loop tension control for Lo/UnLo periods eliminates the tape-damage.
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Eiji Yokoyama, Masato Nagasawa, Yoshinobu Ishida
Article type: Article
Pages
153-154
Published: July 28, 1991
Released on J-STAGE: October 02, 2017
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A precision wide band tension control system for home use digital VTR was devepoped using a movable tape guide pin which was inserted at the tape entrance side of a rotary head drum in the tape travelling path. This tension control system was proved to keep the optimum contact between the head and the tape, thereby to enable high density recording and reproduction.
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Yoshiaki Kohsaka
Article type: Article
Pages
155-156
Published: July 28, 1991
Released on J-STAGE: October 02, 2017
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Recently, software servo technology has been introduced into the servo block of our home VCR. This technology enabled us to not only achieve high stability and a large reduction of external parts but also complicated intelligent functions. This paper describes several software servo technologies on our home VCR.
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Nobuyoshi Okumura, Yukinori Kishida, Masaru Kawabata, Sadanobu Kawabe
Article type: Article
Pages
157-158
Published: July 28, 1991
Released on J-STAGE: October 02, 2017
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This paper describes a software servo control for a VCR, including two elements ; i.e., a disturbance compensation method and a frequency generator (FG) error correction method. The Wow-Flutter of the motor was reduced by software programming only, in a microcomputer, with no other electrical parts added.
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Kiyotaka ARAI, Haruki TOKUMARU, Shin-ichi YOSHIMURA
Article type: Article
Pages
159-160
Published: July 28, 1991
Released on J-STAGE: October 02, 2017
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A split-type optical head using a pair of relay lenses for the focus control is one of the promising means to realize the fast access time in a magneto-optical recording system. A new method to improve remarkably the performance in the focus control for a head of this type has been developed.
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H. Nakashima, H. Horiuchi, S. Yamamoto, Y. Yoshida
Article type: Article
Pages
161-162
Published: July 28, 1991
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Tape tension is one of factors to improve track linearity of VCR. We confirmed that the tape tension ratio had influence on the track linearity.
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Sayuri MURAMATSU, Hideaki MUKAE, Masaru HIGASIONJI, Akio KUROE
Article type: Article
Pages
163-164
Published: July 28, 1991
Released on J-STAGE: October 02, 2017
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The thickness of lubricant film transfered to a stainless pin is measured by using Atmospheric Ultraviolet Photoelectric Analyzer (A-UPA). The effect of lubricant on the friction coefficient of the magnetic tape is discussed.
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Hiroshi Watanabe, Yoshihiko Morita, Shigekazu Minechika, Kenji Asano, ...
Article type: Article
Pages
165-166
Published: July 28, 1991
Released on J-STAGE: October 02, 2017
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An optical video disc for Hi-Vision was developed by recording 2 channel signals on both sides of a disc. Two pick-ups for playback reproduce 20MHz luminance and 6.7MHz chrominance signals without band signal compression. The playing time of CLV disc is 30 minutes and it is enough for practical use.
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Satoshi Takada, Tohru Hoshina
Article type: Article
Pages
167-168
Published: July 28, 1991
Released on J-STAGE: October 02, 2017
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We have developed the video disk recorder using magneto-opcical disks which used in the CM bank system. This paper reports the signal format for our video disk recorder. Error collection method which we used, have high performance for our video disk recorder.
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Hiroyuki Tsuchinaga, Hirofumi Sukeda, Seiichi Mita
Article type: Article
Pages
169-170
Published: July 28, 1991
Released on J-STAGE: October 02, 2017
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HIgh-density recording for magneto-optical disks is studied using a waveform equalization technique. The results of a simulation and an experiment show that an auto-equalizer can improve the raw bit error rate from 〜10^<-3> to 〜10^<-5>, with a recording density of 0.6μm/bit.
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N. Kawamura, T. Tamaki, T. Nomura, K. Shimokawa
Article type: Article
Pages
171-172
Published: July 28, 1991
Released on J-STAGE: October 02, 2017
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We prepared Cu added Bi subsituted Dy iron garnet films by the RF sputtering method and post annealing. We found that the addition of 3.4% Cu into the garnet increased the coercivity and decreased the grain size. To analyze the medium noise we developed a new method that used CCD imaging system combined with a high resolution microscope.
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A. Ohba, M. Ohtake, S. Mita, M. Fukushima
Article type: Article
Pages
173-174
Published: July 28, 1991
Released on J-STAGE: October 02, 2017
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A multi-media filing system has been developed using stacked optical disk files. It has a very large capacity and a fast transfer rate. This system can record and reproduce information such as video and audio in an integrated manner.
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Hiroaki Kotera, Katsuhiro Kanamori
Article type: Article
Pages
175-176
Published: July 28, 1991
Released on J-STAGE: October 02, 2017
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Three-color image reproduction from two-color image lacking one primary color is tried. The two methods are presented : -(1) Channel Interpolation.-(2) Spectral Estimation. (1) interpolates the third color from a combination of remaining two colors. (2) estimates the spectral distribution of each color pixel using the spectral characteristics of input scanner. It is impossible to render perfect colors by two primaries theoretically, but some of them are well restored.
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Yoshizo YAMADA, Makoto TADENUMA, Ichiro YUYAMA
Article type: Article
Pages
177-178
Published: July 28, 1991
Released on J-STAGE: October 02, 2017
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The picture quality of stereoscopic Hi-Vision images band-limited in two-dimensional (horizontal and vertical) domain is evaluated. Throughout the tests, it becomes clear that the band-limitation in diagonal direction is much more effective for three-dimensional images than for two-dimensional ones.
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MASARU KANAZAWA, JUNJI KUMADA
Article type: Article
Pages
179-180
Published: July 28, 1991
Released on J-STAGE: October 02, 2017
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The transmissible color gamut of a TV system is determined by combination of the reference primaries of the system and the dynamic range of the transmission signals. It is shown that the present HDTV system can transmit all the existing surface colors by Y'P_b'P_r' signals with the conventional dynamic range.
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Kenjiro KAI, Tadashi ISOBE
Article type: Article
Pages
181-182
Published: July 28, 1991
Released on J-STAGE: October 02, 2017
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This paper describes on the optimum display conditions for Japanese text information together with pictures on a HDTV monitor. The 48×48 dots or more character sizes are desirable for good display condition. Edge processing and level processing of the background picture make the character display more visible. The best-to view-display condition has been proven the one subjected to edge processing in a grey background.
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Nagato Narita
Article type: Article
Pages
183-184
Published: July 28, 1991
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The perceived intervals between Japanese descriptive terms in the CCIR 5-grade quality scale and in the CCIR 5-grade impairment scale were examined, using graphic scaling method. The validity of this examination was verified by subjective evaluation.
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Masayuki ISHIKAWA, Seiichiro HANGAI, Kazuhiro MIYAUCHI
Article type: Article
Pages
185-186
Published: July 28, 1991
Released on J-STAGE: October 02, 2017
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In order to cartify the availability of the WSNR(Weighted Signal to Noise Ratio) to the objective evaluation of distortion of any picture, two kind of pictures are distorted and various distortion is evaluated by the MOS(Mean Opinion Score) and the WSNR. From results, when distortion of pictures with a human figure is evaluated, it is found that relation between the MOS and the WSNR is linear.
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Li-Ming Chen, Shin Hasegawa
Article type: Article
Pages
187-188
Published: July 28, 1991
Released on J-STAGE: October 02, 2017
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Three types of color pixel arrangement of matrix display devices were evaluated using an objective measure based on the spatial Nyquist limit. Showing moving sinusoidal patterns on a CRT monitor, a subjective measure was done, and the actual visual display-limits of color pixel arrangements were obtained quantitatively.
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Motoshi TANAKA, Tasuku TAKAGI
Article type: Article
Pages
189-190
Published: July 28, 1991
Released on J-STAGE: October 02, 2017
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The effects of the noise parameters such as r.m.s., duration, and occurrence frequency of burst Gaussian noise at constant power on TV picture degradation were studied by subjective evaluation. The mean opinion scores for the burst noise approached to those for the continuous Gaussian noise as increase of the occurrence frequency at constant burst duration.
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Takahito KATO
Article type: Article
Pages
191-192
Published: July 28, 1991
Released on J-STAGE: October 02, 2017
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This paper describes subjective factors in evaluating the quality of hand-written Kanji characters. Ten Japanese subjects were asked to rate the character quality of each example on a 5-point scale : very neat, neat, fair, poor, very poor. The subjects were given 2 trials. First, the score and the standard deviation of each example were calculated. The results show that evaluations in the range of very neat and very poor are more stable than in the range of fair. It is suggested that some characters were easily judged and others which were not. Second, the correlation coefficients for the 2 trials for each character varied. However, the relationship between the character and correlation coefficient is not clear.
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Masaomi ODA
Article type: Article
Pages
193-194
Published: July 28, 1991
Released on J-STAGE: October 02, 2017
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Ease of reading Hirakana in a vertical column and in a horizontal row are compared by a tachistoscope. Meaningless horizontal writing was read in a shorter duration compared with meaningless vertical writing. Moreover, the meaningful writing had advantage more than meaningless one.
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