The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 07, 1985
Filed:
Jun. 28, 1983
Isao Masuda, Sagamihara, JP;
Nobuaki Takahashi, Yamato, JP;
Kazunori Nishikawa, Machida, JP;
Yoshiki Iwasaki, Yokohama, JP;
Shoji Ueno, Zama, JP;
Victor Company of Japan, , JP;
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.