JPH01153787U

JPH01153787U -

Info

Publication number: JPH01153787U
Application number: JP5019888U
Authority: JP
Priority date: 1988-04-13
Filing date: 1988-04-13
Publication date: 1989-10-23

Description

[Brief explanation of the drawing]

第１図はこの考案の１実施例を示すビデオテー
プレコーダにおける主要部のブロツク図、第２図
は、従来のビデオテープレコーダのブロツク図、
第３図は、第２図のビデオテープレコーダの動作
を示すタイムチヤートである。４……システムコントローラ、１６……復調回
路、１７……切換スイツチ、１８……Ａ／Ｄ変換
器、１９……フイールドメモリ、２０……Ｄ／Ａ
変換器、３１……減算器、３２……絶対値変換器
、３３……比較器、３４……表示／警報出力回路
。 FIG. 1 is a block diagram of the main parts of a video tape recorder showing one embodiment of this invention, and FIG. 2 is a block diagram of a conventional video tape recorder.
FIG. 3 is a time chart showing the operation of the video tape recorder of FIG. 4... System controller, 16... Demodulation circuit, 17... Changeover switch, 18... A/D converter, 19... Field memory, 20... D/A
Converter, 31...Subtractor, 32...Absolute value converter, 33...Comparator, 34...Display/alarm output circuit.

Claims

[Claim for Utility Model Registration] A signal extraction means for extracting signals at a predetermined ratio from an input video signal, a video head for recording and reproducing the signal portion extracted by the signal extraction means on a magnetic tape, and a video head for recording and reproducing the signal portion extracted by the signal extraction means on a magnetic tape. an electric/mechanical conversion element to be displaced; a drive control means for driving the electric/mechanical conversion element; a memory means for storing image information based on a video signal reproduced by the video head; and a control means for controlling write and read operations of the memory means. comprising a memory control means and a tape running control means for controlling the running of the magnetic tape, so that when the magnetic tape is run at a low speed during recording, the recording track is recorded in the same pattern as the recording track when running at a standard speed; When the video head is displaced by an electromechanical transducer and the magnetic tape is played back at a low speed, the video head is displaced by the electromechanical transducer so that tracks recorded on the magnetic tape can be traced. , during a period when a good reproduced video signal is obtained in the video head,
In the video tape recorder, image information based on the reproduced video signal is written in the memory means, and image information is read out from the memory means and interpolated in another period, and a magnetic tape recorded at a low speed is recorded at a standard speed. and a comparison means for comparing the image information written in the memory means with the image information previously written in the memory means, and a display or an alarm to notify a change in the image based on the comparison result of the comparison means. A video tape recorder comprising: display/alarm output means for outputting.