Magnetic recording and reproducing apparatus for recording and reproducing a video signal obtained from a high speed scanning video camera

• US 4,614,980 A
• Filed: 04/20/1984
• Issued: 09/30/1986
• Est. Priority Date: 04/22/1983
• Status: Expired due to Term

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Suzuki, Hideto, Ninomiya, Takeshi
• Primary Examiner(s): RICHARDSON, ROBERT
• Application Number:
  US06/602,369
• Time in Patent Office: 893 Days
• Field of Search: 358/335, 358/338, 358/347, 358/213, 358/906, 358/346, 360/8, 360/9.1, 360/10.1, 360/22, 360/24, 360/33.1, 369/32
• US Class Current: 386/205
• CPC Class Codes: G11B 5/592 using bimorph elements supporting the heads see provisional also G11B5/588
• CPC Class Codes: H04N 5/78263 for recording on tracks inclined relative to the direction of movement of the tape
• CPC Class Codes: H04N 5/783 Adaptations for reproducing at a rate different from the recording rate
• CPC Class Codes: H04N 5/91 Television signal processing therefor
• CPC Class Codes: H04N 9/7973 by dividing the luminance or colour component signal samples or frequency bands among a plurality of recording channels H04N9/804, H04N9/825 take precedence

Abstract

Magnetic recording and reproducing apparatus records and reproduces on or from a magnetic recording tape a high speed video signal obtained from a high speed scanning video camera having a scanning speed N times the scanning speed of a standard video camera generating a standard television video signal, where N is an integer. The apparatus includes a drive for driving the magnetic recording tape to a run at tape speed N times the tape speed of a standard recording apparatus, circuitry for dividing the high speed video signal into N-channel video signals, and an expander for expanding the time axis of the high speed video signal so that each of the N-channel video signals is slightly compressed as compared to the standard television video signal. A modulator modulates each of the video signals the time axes of which are expanded, and a recording and reproducing mechanism includes a rotary drum having N rotary magnetic heads mounted on the circumference thereof with an equal angular distance therebetween to record each of the modulated video signals on the magnetic recording tape as successive tracks and a playback head mounted on the circumference at a predetermined position. The diameter of the rotary drum is in a predetermined relation to that of the standard magnetic recording and reproducing apparatus.

Claims

1. Apparatus for recording and reproducing on or from a magnetic recording tape a high speed video signal obtained from a high speed scanning video camera having a scanning speed N times the scanning speed of a standard video camera generating a standard television video signal, where N is an integer equal to or greater than 2;

said apparatus comprising;

means for driving said magnetic recording tape to run at tape speed N times the tape speed of a standard recording and reproducing apparatus;

means for dividing said high speed video signal into N channels of video signals;

means for expanding the time axis of said high speed video signal so that each of said N channels of video signals is slightly compressed as compared to said standard television video signal;

means for modulating each of said video signals the time axes of which are expanded; and

recording and reproducing means including a rotary drum having N rotary magnetic heads mounted on the circumference thereof with an equal angular distance therebetween to record each of said modulated video signals on said magnetic recording tape as successive tracks and a playback head mounted on said circumference at a predetermined position, the diameter of said rotary drum being in a predetermined relation to that of said standard magnetic recording and reproducing apparatus.

2. Apparatus according to claim 1, wherein said time axis expanding means comprises a time axis expanding circuit for expanding the time axis of said high speed video signal so as to become equal to that of said standard video signal and a time axis compressing circuit for slightly compressing the expanded time axis of said high speed video signal.

3. Apparatus according to claim 2, wherein said time axis compressing circuit compresses said high speed video signal the time axis of which is expanded to be the same as that of said standard television signal to 1+K/S_L wherein K:

a natrual number

S_L ;

the number of scanning lines.

4. Apparatus according to claim 1, wherein the diameter of said rotary drum is ##EQU7## wherein D:

the diameter of said rotary drum

k;

a natural number

S_L ;

the number of scanning lines

h;

length of a video track in the width direction of the tape

L;

video track length of a standard magnetic recording and reproducing apparatus

θ

c;

video track angle

Dc;

drum diameter of the standard magnetic recording and reproducing apparatus.

vt;

tape speed of the standard magnetic recording and reproducing apparatus.