Video tape recorder carrying out field extraction recording and/or reproduction of a video signal

• US 5,594,596 A
• Filed: 06/02/1995
• Issued: 01/14/1997
• Est. Priority Date: 09/17/1992
• Status: Expired due to Fees

• Current Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Inventors: Kawakami, Kouichi, Kuge, Satoru, Hamaguchi, Toshihide, Maida, Yoshiaki
• Primary Examiner(s): Sniezek, Andrew L.
• Application Number:
  US08/458,284
• Time in Patent Office: 592 Days
• Field of Search: 360/38.1, 360/11.1, 360/10.1, 360/10.3, 360/27, 360/71, 360/73.01, 360/73.04, 360/73.05, 360/73.06, 360/73.09, 360/73.11, 360/73.12
• US Class Current: 386/221
• CPC Class Codes: G11B 15/1875 adaptations for special effects or editing signal processing or indexing therefor G11B27/00
• CPC Class Codes: G11B 15/4672 with provision for information tracking
• CPC Class Codes: G11B 15/4673 by controlling the speed of the tape while the head is rotating
• CPC Class Codes: H04N 5/783 Adaptations for reproducing at a rate different from the recording rate
• CPC Class Codes: H04N 5/915 for field- or frame-skip recording or reproducing

Abstract

A time lapse VTR carrying out field extraction recording includes a gate for extracting intermittently a supplied video signal at a ratio of one field to every three fields, a switching circuit for designating selectively a tape running speed of either 1/9 or 1/12 the tape running speed of a SP mode in the VHS system, and a servo control circuit for driving a capstan motor to run a magnetic tape at the designated tape running speed. The video signal extracted intermittently by the gate circuit is recorded at an azimuth angle differing from each field by a plurality of video heads on a magnetic head running at the designated tape running speed. As a result, the reproduction compatibility of a magnetic tape having field extraction recorded by a time lapse VTR with an EP mode of a conventional VTR of the VHS system is ensured.

Claims

1. A video tape recorder that allows special reproduction by field forwarding in a LP mode of the VHS system, comprising:

means for reproducing a video signal and a control signal recorded on a magnetic tape,

means for forming a pseudo control signal at a timing at which said control signal is to be reproduced when said reproduced control signal is missing,

means for driving and controlling a capstan motor in response to said reproduced control signal or said pseudo control signal at the time of said special reproduction by field forwarding, and

means for setting the generation period of said pseudo control signal so that the field forwarding amount of said capstan motor becomes 1/2 the general field forwarding amount in special reproduction by field forwarding in a LP mode, when said video signal and said control signal are reproduced by special reproduction by field forwarding from a magnetic tape on which said video signal has been intermittently recorded at a ratio of one field to every three fields and said control signal has been recorded once for every six fields at a tape running speed of 1/12 the tape running speed of a SP mode in the VHS system.