Digital FM Signal Processing for VCRs
As CRTs have become larger, there has been an increasing demand for higher quality reproduced images from consumer VCRs that record FM signals. It is well known that the SNR is improved without deterioration of frequency response by using an equalizer to emphasize the lower sidebands or to suppress...
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| Published in | The Journal of the Institute of Television Engineers of Japan Vol. 50; no. 1; pp. 71 - 78 |
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| Main Authors | , , , , |
| Format | Journal Article |
| Language | Japanese |
| Published |
The Institute of Image Information and Television Engineers
20.01.1996
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| Online Access | Get full text |
| ISSN | 0386-6831 1884-9652 |
| DOI | 10.3169/itej1978.50.71 |
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| Abstract | As CRTs have become larger, there has been an increasing demand for higher quality reproduced images from consumer VCRs that record FM signals. It is well known that the SNR is improved without deterioration of frequency response by using an equalizer to emphasize the lower sidebands or to suppress the upper sidebands of playback FM signals. However, a type of noise which appears as signal inversion is generated at black-to-white transitions. The SNR is therefore compromised by using a conventional equalizer to maintain the inversion margin. These equalizers have fixed characteristics, even for images without the transitions that cause signal inversions. We have applied digital signal processing technology to develop a dynamic equalizer that selects the optimum from among several equalizer functions at each sampling point, according to the state of the playback FM signal. Simulations have confirmed the improvement in SNR without causing inversions. |
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| AbstractList | As CRTs have become larger, there has been an increasing demand for higher quality reproduced images from consumer VCRs that record FM signals. It is well known that the SNR is improved without deterioration of frequency response by using an equalizer to emphasize the lower sidebands or to suppress the upper sidebands of playback FM signals. However, a type of noise which appears as signal inversion is generated at black-to-white transitions. The SNR is therefore compromised by using a conventional equalizer to maintain the inversion margin. These equalizers have fixed characteristics, even for images without the transitions that cause signal inversions. We have applied digital signal processing technology to develop a dynamic equalizer that selects the optimum from among several equalizer functions at each sampling point, according to the state of the playback FM signal. Simulations have confirmed the improvement in SNR without causing inversions. |
| Author | Fujiwara, Naohisa Hatanaka, Keiji Shirasaki, Yoshiyuki Kawabe, Sadanobu Watanabe, Miyoichi |
| Author_xml | – sequence: 1 fullname: Watanabe, Miyoichi organization: Imaging Systems Laboratory, Mitsubishi Electric Corporation – sequence: 1 fullname: Hatanaka, Keiji organization: Imaging Systems Laboratory, Mitsubishi Electric Corporation – sequence: 1 fullname: Shirasaki, Yoshiyuki organization: Imaging Systems Laboratory, Mitsubishi Electric Corporation – sequence: 1 fullname: Kawabe, Sadanobu organization: Imaging Systems Laboratory, Mitsubishi Electric Corporation – sequence: 1 fullname: Fujiwara, Naohisa organization: Imaging Systems Laboratory, Mitsubishi Electric Corporation |
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| References | 3) 白崎, 畠中, 藤原, 渡部, 川辺 : “VTRにおけるディジタルFM信号処理方式の検討”, 平6信学秋全大, C-375 (1994 11) L. R. Rabiner and B. Gold : “Theory and Application of Digital Signal Processing”, pp. 105-123 Prentice-Hall, Englewood Cliffs, NJ (1975 8) Sonke Mehrgardt : “Digital Signal Processing in Video Tape Recorders”, IEEE Trans. Consum. Electron., CE-31, 3, pp. 374-377 (Aug. 1985 2) 竹田, 勝木, 降旗 : “高帯域映像信号の磁気記録におけるS/N改善検討”, テレビ誌, 46, 10, pp.1262-1269 (Oct.1992 4) 畠中, 白崎, 藤原, 渡部, 川辺 : “VTRにおけるディジタルFM信号処理方式”, テレビ学技報, 18, 72, pp.119-124, CE'94-43 (Nov.1994 9) 末定, 谷口 : “VTRにおける狭帯域FMの反転現象”, National Technical Report, 25, 1 (Feb.1979 1) 勝木, 竹田, 降旗 : “ベースバンド1チャンネル記録方式HDVTRにおけるS/N改善検討”, テレビ学技報, 15, 18, pp.19-24, VIR'91-15 (Mar.1991 5) 横山克哉 : “ホームビデオ技術”, 日本放送出版協会 (1985 10) 電子通信学会 : “ディジタル信号処理”, pp.110-112, コロナ社 (1979 6) 萩原将文, 中川正雄 : “ディジタル信号処理技術を用いた改良型TAN形式FM復調器の特性”, 信学論 (B), J67-B, 5, pp.545-551 (May 1984 7) Joseph A. Webb : United States Patent 4,090,145 (May 1978 |
| References_xml | – reference: 2) 竹田, 勝木, 降旗 : “高帯域映像信号の磁気記録におけるS/N改善検討”, テレビ誌, 46, 10, pp.1262-1269 (Oct.1992) – reference: 8) Sonke Mehrgardt : “Digital Signal Processing in Video Tape Recorders”, IEEE Trans. Consum. Electron., CE-31, 3, pp. 374-377 (Aug. 1985) – reference: 9) 末定, 谷口 : “VTRにおける狭帯域FMの反転現象”, National Technical Report, 25, 1 (Feb.1979) – reference: 1) 勝木, 竹田, 降旗 : “ベースバンド1チャンネル記録方式HDVTRにおけるS/N改善検討”, テレビ学技報, 15, 18, pp.19-24, VIR'91-15 (Mar.1991) – reference: 6) 萩原将文, 中川正雄 : “ディジタル信号処理技術を用いた改良型TAN形式FM復調器の特性”, 信学論 (B), J67-B, 5, pp.545-551 (May 1984) – reference: 10) 電子通信学会 : “ディジタル信号処理”, pp.110-112, コロナ社 (1979) – reference: 4) 畠中, 白崎, 藤原, 渡部, 川辺 : “VTRにおけるディジタルFM信号処理方式”, テレビ学技報, 18, 72, pp.119-124, CE'94-43 (Nov.1994) – reference: 3) 白崎, 畠中, 藤原, 渡部, 川辺 : “VTRにおけるディジタルFM信号処理方式の検討”, 平6信学秋全大, C-375 (1994) – reference: 11) L. R. Rabiner and B. Gold : “Theory and Application of Digital Signal Processing”, pp. 105-123 Prentice-Hall, Englewood Cliffs, NJ (1975) – reference: 5) 横山克哉 : “ホームビデオ技術”, 日本放送出版協会 (1985) – reference: 7) Joseph A. Webb : United States Patent 4,090,145 (May 1978) |
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| Title | Digital FM Signal Processing for VCRs |
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