Dynamic magnetic information storage or retrieval – General processing of a digital signal
Patent
1989-03-28
1992-06-23
Psitos, Aristotelis
Dynamic magnetic information storage or retrieval
General processing of a digital signal
360 65, 375113, G11B 509, H04N 576
Patent
active
051248611
ABSTRACT:
A digital signal magnetic recording and playback apparatus which is applicable to digital video signals, utilizes quadrature amplitude modulation to produce a recording signal from a digital input signal with a carrier frequency being employed which is less than or equal to than the frequency of a recording system clock signal that is synchronized with the successive data values of the digital input signal. Carrier bursts are periodically inserted into the recording signal with a fixed period, through data inserted by a burst data insertion circuit and the carrier and clock signal are arranged to periodically coincide in phase, with the aforementioned period. The carrier frequency is made equal to the clock frequency multiplied by a factor (n/m), where n and m are integers and n<m. During playback, time information obtained from the bursts is used to mutually phase-relate recovered clock and carrier signals.
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Kobayashi Masa-aki
Matsuta Toyohiko
Nakatsu Etsuto
Shimazaki Hiroaki
Shimotashiro Masafumi
Matsushita Electric - Industrial Co., Ltd.
Psitos Aristotelis
Sheladia Varsha V.
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