Dynamic information storage or retrieval – Binary pulse train information signal – Binary signal gain processing
Patent
1983-03-24
1986-04-15
Richardson, Robert L.
Dynamic information storage or retrieval
Binary pulse train information signal
Binary signal gain processing
329106, G06M 300, G11B 1700, G11B 1924
Patent
active
045832110
ABSTRACT:
A circuit is disclosed which is applied for a digital audio disk (DAD) system for detecting a maximum inverting period of a digital audio signal optically read out from the DAD. The audio signal is prestored in the DAD so as to have the maximum and minimum inverting periods specially set by an eight to fourteen modulation (EFM). The detection circuit includes an edge detector for detecting pulse edges of the digital audio signal, a counter for counting pulse edge intervals on the basis of a modulating clock signal, a counter type register, and a comparator. When the register contents of the counter type register is smaller than the count value of the counter, the comparator produces a pulse signal by which said register updates the contents of the register by "1". Repeating this operation, a maximum inverting period value of the digital audio signal is obtained in a fixed period of time.
REFERENCES:
patent: 3949199 (1976-04-01), Odom
patent: 4397011 (1983-08-01), Ogawa
patent: 4423498 (1983-12-01), Kimura et al.
patent: 4466089 (1984-08-01), Wachi
"Digital Audio Disc", The Journal of The Acoustical Society of Japan, vol. 38, No. 12., 1982, pp. 786-794, Ryuji Iwashita.
Kojima Tadashi
Nakamura Yukio
Nishikawa Meisei
Richardson Robert L.
Tokyo Shibaura Denki Kabushiki Kaisha
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