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:
Jan. 06, 1987
Filed:
May. 02, 1983
Takashi Uchimi, Yokohama, JP;
Victor Company of Japan, Limited, Yokohama, JP;
Abstract
In a digital signal recording and playback system, digital data is provided by the pulse code modulation of an analog signal. The digital data is modulated into a digital signal in such a manner as to have a maximum reversal interval equal to the bit period of the original data and a minimum reversal interval equal to one half the bit period. Such a digital signal is recorded into and reproduced out of a recording medium. During recording, frequencies are selected for a first or high frequency component which repeats at the minimum reversal interval and a second or low frequency component which repeats at the maximum reversal interval, such that the playback level of the first frequency component becomes sufficiently lower than that of the second. During playback, the first frequency component is further attenuated relative to the second or fully removed and the playback level or the slice level is controlled with regard to the second component of the reproduced digital signal.