G - Physics – 11 – B
Patent
G - Physics
11
B
352/17, 352/19.1
G11B 20/10 (2006.01) G11B 20/18 (2006.01)
Patent
CA 1201201
ABSTRACT OF THE DISCLOSURE: A digital signal is organized into a sequence of frames each comprising digital words containing data information and frame synchronization information. A digital scrambling word having a predetermined bit pattern is generated by a data scrambler for each frame signal at the termination of a frame sync word. The scrambling word is modulo-2 summed with the data information word to randomize each frame signal to the exclusion of the frame sync word. The randomized signal and a replica of the data information word are frequency modulated and the so modulated signal is recorded on a recording medium. Upon reproduction, the recorded signal is frequency demodulated to recover the scrambled frame from which clock pulses are regenerated and the frame sync word is detected. A data de-scrambler gene- rates a digital de-scrambling word when there is a phase match between the detected frame sync word and the clock signal. The de-scrambling word is modulo-2 summed with the scrambled information word to recover a replica of the original digital signal.
408446
Iwasaki Yoshiki
Komura Makoto
Masuda Isao
Nishikawa Kazunori
Takahashi Nobuaki
Robic Robic & Associes/associates
Victor Company Of Japan Limited
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