JPH0181725U

JPH0181725U -

Info

Publication number: JPH0181725U
Application number: JP1987178010U
Authority: JP
Priority date: 1987-11-20
Filing date: 1987-11-20
Publication date: 1989-05-31

Description

[Brief explanation of the drawing]

第１図ないし第３図はこの考案のビデオテープ
レコーダの１実施例を示し、第１図はブロツク図
、第２図は第１図の一部の詳細なブロツク図、第
３図ａ，ｂは頭出し時のテープ速度、コントロー
ル信号の周波数それぞれの説明図、第４図ａ，ｂ
はそれぞれ従来のビデオテープレコーダの頭出し
時のコントロール信号の周波数の説明図である。２……ビデオテープ、６……周期測定回路、８
……周期比較回路、１１……モータ駆動回路、１
２……リールモータ、１３……コード読取り回路
。 1 to 3 show one embodiment of the video tape recorder of this invention, FIG. 1 is a block diagram, FIG. 2 is a detailed block diagram of a part of FIG. 1, and FIGS. 3 a and b. are explanatory diagrams of the tape speed and control signal frequency during cueing, Figures 4a and b
1 and 2 are explanatory diagrams of frequencies of control signals when cuing up a conventional video tape recorder. 2...Video tape, 6...Period measurement circuit, 8
...Period comparison circuit, 11...Motor drive circuit, 1
2... Reel motor, 13... Code reading circuit.

Claims

[Scope of claim for utility model registration] Recording in multiple time modes with different tape speeds,
It has a playback function, and at the time of recording, the duty ratio of the control signal at the position corresponding to the beginning of each recorded program on the videotape is varied in binary according to the code for cueing each recorded program, and each recording At the beginning of a program, the tape is run at high speed in a half-loading state to reproduce the control signal;
In a video tape recorder that detects a binary change in the falling timing of the control signal based on the rising timing of the control signal, and performs high-speed cueing of each recorded program by reading the code based on erroneous detection. , a period measuring circuit for measuring the reproduction period of the control signal by measuring the interval between the rising edges; and when a tape recorded in the longest time mode is run at a constant speed approximately equal to the maximum speed at which the code can be read. a period comparison circuit that compares a specified reproduction period of the measuring circuit with a measurement period of the measurement circuit; and a tape speed control means that controls a tape speed so that the measurement period substantially matches the specified reproduction period based on the comparison result of the comparison circuit. Videotape recorder with and.