Recording apparatus for recording a video signal obtained from a high speed scanning video camera

• US 4,785,358 A
• Filed: 08/19/1987
• Issued: 11/15/1988
• Est. Priority Date: 03/25/1983
• Status: Expired due to Term

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Ninomiya, Takeshi
• Primary Examiner(s): Psitos, Aristotelis M.
• Application Number:
  US07/088,502
• Time in Patent Office: 454 Days
• Field of Search: 358/310, 358/320, 358/326, 358/329, 358/335, 358/338, 358/346, 358/347, 358/213, 358/906, 360/9.1, 360/10.3, 360/22, 360/23, 360/33.1, 360/36.2, 360/8, 360/10.1, 360/24
• US Class Current: 386/314
• CPC Class Codes: G11B 20/00007 Time or data compression or expansion audio compression based on psychoacoustics G10L19/00; data processing for reproducing audio data at different playback speeds G10L21/04; video compression H04N19/00; data compression per se H03M7/30
• CPC Class Codes: G11B 20/10527 Audio or video recording; Data buffering arrangements G11B20/12 - G11B20/18 take precedence
• CPC Class Codes: H04N 5/78263 for recording on tracks inclined relative to the direction of movement of the tape
• CPC Class Codes: H04N 5/92 Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback

Abstract

A recording apparatus includes a memory circuit for storing a video signal derived from a high speed scanning video camera the scanning speed of which is faster than the scanning speed of a standard television signal and a plurality of rotating magnetic heads supplied with video signals of a plurality of channels which are read out in parallel from the memory circuit. The video signals of the plurality of channels are recorded on a magnetic tape by the plurality of rotating magnetic heads so as to sequentially form slant adjoining tracks.

Claims

1. Apparatus for recording on a magnetic recording tape a 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 a natural number equal to 3 or more;

said apparatus comprising;

means for driving said magnetic recording tape continuously at a tape speed N times that of a standard type video signal recording apparatus;

means for converting said video signal to a digital video signal;

means for dividing said digital video signal into a plurality of channels of digital video signals;

means for expanding a time axis of each of said plurality of channels of digital video signals;

means for converting each of said time-axis-expanded digital video signals to an analog video signal so that each of said analog video signals has the same frequency band as that of said standard television video signal;

means for modulating said analog video signals; and

means including a rotating drum having a cylindrical surface and N magnetic transducer heads mounted on said cylindrical surface for recording said modulated analog video signals on successive video tracks formed on said recording tape, said rotating drum having a diameter and said recording tape defining a helix angle respectively smaller and larger than the drum diameter and tape helix angle of said standard type video signal recording apparatus, so that said successive video tracks are made to correspond to those of said standard type video signal recording apparatus and said modulated analog video signals as recorded are compatible with said standard type video signal recording apparatus.

2. Apparatus according to claim 1, in which said drum diameter D of said recording apparatus is given as ##EQU4## wherein h:

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

L;

video track length of a standard recording apparatus,

θ

c;

video track angle

Dc;

a diameter of a drum of a standard type recording apparatus.

Vt;

tape speed of a standard type recording apparatus, and said helix angle (θ

_H) is given as ##EQU5##

4. Apparatus according to claim 1, further comprising reproducing means including a bimorph leaf;

a reproducing head mounted on said bimorph leaf; and

a dynamic tracking signal generator for controlling said bimorph leaf so that it traces said successive video tracks when said tape is driven at said tape speed of said standard type video recording apparatus.

5. Apparatus according to claim 4, in which said dynamic tracking signal generator comprises N direct current voltage sources, said N voltage sources respectively having DC voltage potentials that differ from one another and a selecting device for selecting one of said N voltage sources and supplying the same to said bimorph leaf.

3. Apparatus for recording on a magnetic tape a video signal obtained from a high speed scanning video camera having a scanning speed NM times the scanning speed of a standard video camera generating a standard television video signal, where N and M are natural numbers such that their product is 3 or more;

said apparatus comprising;

means for changing the value of M;

means for driving said magnetic recording tape continuously at a tape speed MN times that of a standard type video signal recording apparatus;

means for converting said video signal to a digital video signal;

means for dividing said digital video signal to a plurality of channel digital video signals;

means for expanding the time axis of each of said plurality of channel digitial video signals;

means for converting each of said time-axis-expanded digital video signals to an analog video signal so that each of said analog video signals has the same frequency band as that of said standard television video signal;

means for modulating said analog video signals;

means including a rotating drum having a cylindrical surface and N magnetic transducer heads mounted on said cylindrical surface for recording said modulated analog video signals on successive video tracks formed on said recording tape, said rotating drum having a diameter and said recording tape defining a helix angle respectively smaller and larger than the drum diameter and tape helix angle of said standard type video signal recording apparatus, so that said successive video tracks are made to correspond to those of said standard type video signal recording apparatus and said modulated analog video signals as recorded are compatible with said standard type video signal recording apparatus; and

means for driving said rotating drum at a rotating speed M times the rotating speed of said standard type video signal recording apparatus.