DIGITAL MAGNETIC PICTURE RECORDING AND REPRODUCING DEVICE

Japanese Patent JPH01211373

A

PURPOSE:To make solid writing possible without making an azimuth angle so large and improve a frequency utilizing efficiency and, at the same time, to make recording and reproduction without receiving influences from reproduction distortion by performing multilevel orthogonal amplitude modulation on multilevel digital codes to which error correction is performed and recording the codes after bias signals are added to the codes. CONSTITUTION:The n-bit digital codes converted by an AD converter 1 are outputted to an error correction adding multilevel converter 2. The converter 2 is constituted of an error correcting encoder 3 and multilevel converter 4 and generates multilevel digital codes to which error correcting codes are added. The multilevel digital codes are modulated to multilevel orthogonal amplitude modulated signals by means of a multilevel QAM device 5. An adder 6 adds bias signals which are the output of a bias signal generator 7 to the multilevel orthogonal amplitude modulated signals and the output of the adder 6 is recorded on a magnetic recording medium 10. Therefore, solid writing becomes possible even though the azimuth angle is not set so large and the frequency utilizing efficiency is improved. Moreover, recording and reproduction becomes possible almost free from influences of reproduction distortion.

SHIMOTASHIRO MASAFUMI
MATSUDA TOYOHIKO
KOBAYASHI MASAAKI
SHIMAZAKI HIROAKI

JP3817288A

August 24, 1989

February 19, 1988

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MATSUSHITA ELECTRIC IND CO LTD

G11B20/10; (IPC1-7): G11B20/10

JPS5522261A	1980-02-16
JPS62190934A	1987-08-21

Tomoyuki Takimoto

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