Digital vtr

Abstract

Abstract PURPOSE:To attain a recording a high definition mode in addition to a standard mode by switching the rate of band compression in response to the required information quantity in a digital VTR, the rotary speed of a rotary head and the running speed of a tape. CONSTITUTION:A signal Ss is inputted from the contact H of the switch 41 to a channel coding circuit 16 at the high definition mode recording from the contact H of a switch 41, the signal is converted into a signal Sm and fed to heads 2A, 2B. A motor 22 is subjected to servo control in a servo circuit 20 so that the frequency of a pulse Pg is twice the frequency of a pulse Pv normally and the heads 2A, 2B are driven at speed twice as much as the standard mode. Moreover a motor 32 is subjected to servo control so that the frequency of a signal Sf is twice as much as the frequency of a signal Sr normally in a servo circuit 30. Thus, the tape 1 is driven at the speed twice as much as the speed at the standard mode. Thus, the signal Sm having the signal Ss is recorded as two azimuth magnetic tracks per one field as the same pitch as that at the standard mode on the tape 1.

Inventors

• 👤 Yukio Kubota
• 👤 幸雄 久保田

Bibliographic Details