Dynamic magnetic information storage or retrieval – Converting an analog signal to digital form for recording;...
Patent
1983-06-28
1985-05-07
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
Converting an analog signal to digital form for recording;...
360 40, G11B 500, G11B 509
Patent
active
045161631
ABSTRACT:
A digital information recording system comprises a randomized digital signal forming circuit for forming a randomized digital signal by carrying out modulo-2 addition of at least digital information signals of a plurality of channels in a digital signal and a random code sequence which is generated independently, a detector for successively detecting values of each of a predetermined number of words from each of the digital information signals of a plurality of channels in the randomized digital signal, in terms of one word, and generating a detection signal only when values of bits in the one word are all "1" or all "0", a timing circuit for generating a timing signal for every period corresponding to a transmission period of a least significant bit in one word from each of the digital information signals of a plurality of channels, a polarity inverting circuit for passing the randomized digital signal unchanged during a period in which the detection signal is not generated from the detector, and inverting the polarity of the least significant bit in one word from each of the digital information signals of a plurality of channels in the randomized digital signal when simultaneously applied with the detection signal and the timing signal, and a recording circuit for recording a digital signal obtained from the polarity inverting circuit.
REFERENCES:
patent: 4466089 (1984-08-01), Wachi
patent: 4467373 (1984-08-01), Taylor et al.
Iwasaki Yoshiki
Masuda Isao
Nishikawa Kazunori
Takahashi Nobuaki
Ueno Shoji
Canney Vincent P.
Victor Company of Japan
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