JPS6449386A - Recording and reproducing method - Google Patents

Abstract

PURPOSE:To low suppress the speed of revolution of a rotary head drum and to execute the recording of especially a wide frequency band signal which goes to a high-speed revolution with the rotary head drum having a small diameter by recording simultaneously in parallel the signals expanded by plural heads. CONSTITUTION:K pieces (four pieces for executing example) of magnetic heads are arranged at constant intervals, for example, 90 deg. intervals and when the number of the heads which can be simultaneously recorded is (m) pieces, for example, three, m/k revolutions are necessary to form one track. Since the phases of the respective heads are dislocated by only one rotation, {m/k+(n-1)/ k}=(n+m-1)/K revolutions are made to execute to form (n) pieces of tracks. The rotary head drum n/k-rotates during a time during which a one-field signal is supplied. For this reason, the ratio of the real time of the one-field signal to be supplied and the time necessary for recording perfectly the signal is an {(n+m-1)/k}/(n/k)=(n+m-1)/n. It is desirable that a magnetic tape is wound onto an amplifier head drum over range of a {360(k-1)/k} deg., for example, 270 deg..