Junzo Murakami
Toshiba
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Featured researches published by Junzo Murakami.
IEEE Transactions on Consumer Electronics | 1980
Shinichi Makino; Junzo Murakami; Masaru Sakurai; Shunichi Ohnishi; Masaru Obara
Ghost is one of the most serious problems in TV reception. Ghost reduction is highly desirable, and some automatic deghosting systems have been reported [1] ,[2] [3], [4]. All the systems utilize transversal filters. The approach with a transversal filter may be the best way.
IEEE Transactions on Consumer Electronics | 1978
Shinichi Makino; Masaru Sakurai; Mineo Iwasawa; Syunichi Ohnishi; Junzo Murakami; Toshinori Miura
Ghost may be one of the largest remnaining causes of picture degradations as TV broadcast and receivers quality increases rapidly. Even the best antennas are not always adequate to remove ghosts. Most of the existing systems are not practical because they must be readjusted for each channel and different meteorogical conditions.
IEEE Transactions on Consumer Electronics | 1979
Junzo Murakami; Kazuo Ohzeki; Keisuke Ogi
Among various approaches for realizing a practical ghost canceller, the one based on an adaptive transversal filter has recently been studied most enthusiastically.(1) ~(3) The inherent merit of this approach lies in the fact that it can cancel diffused multiple ghosts, generated by complex transmission path irregularities. This feature can not be attained by a single-delay-line ghost canceller.
IEEE Transactions on Consumer Electronics | 1982
Masaharu Obara; Takashi Uehara; Shinichi Makino; Tohru Hirata; Kazuo Ohzeki; Junzo Murakami
Some trials to reduce TV ghosts have been reported, utilizing transversal filters. (114) They are effective for video ghost reduction as well as for Teletext equalizing.
IEEE Transactions on Broadcasting | 1983
Masaharu Obara; Hideo Kusaka; Junzo Murakami; Shin'ich Makino; Tatsuo Sakaue
A system study has been conducted on a transversal filter ghost canceller to achieve system optimization, and an LSI CCD transversal filter for use in the ghost canceller was developed. Furthermore, a practical model of the ghost canceller was constructed on a trial basis. The results of field tests made on the test equipment showed that this system could improve TV picture quality by more than one grade in a five grade subjective evaluation and that the ghost canceller would be useful in practical applications.
Archive | 1995
Minoru Namekata; Junzo Murakami
Archive | 1984
Junzo Murakami
Archive | 1995
Junzo Murakami
Archive | 1989
Mutsumu Serizawa; Junzo Murakami
Archive | 1989
Mutsumu Serizawa; Junzo Murakami