JPS6366749A - Video tape recorder - Google Patents

Abstract

PURPOSE:To remarkably improve a state where the head part of pictures is not recorded for a few seconds when an alarm is inputted by making a VTR in the state of the pause of picture recording when a certain time lapses after the application of AC power source and releasing a pausing state to turn into the state of picture recording when the alarm is inputted. CONSTITUTION:When an AC plug socket is entered, a power source recitification circuit 1 supplies DC power sources to the respective circuit systems of the VTR and simultaneously outputs an output for operation so as to turn a picture recording switch means 2 and a pause switching means 3 on. Both switch means are inputted in a system control circuit 4 which executes the control of the VTR, for example, a micro computer, and the circuit 4 starts a driving circuit 5 which drives a cylinder motor, capstan motor, etc., in order to make the VTR in the pausing state of picture recording. If an alarm input is inputted in such a state, the pausing state of picture recording is released to be turned on to the state of picture recording by switching the pause switch means 3. Thus the state of picture recording is immediately obtained by the alarm input.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a video tape recorder that is effective for monitoring purposes and the like.

[Prior art] Conventional surveillance VTRs, called time-lag video, have an alarm input terminal (alarm input terminal), and this input allows for intermittent recording (recording the entire video signal, so it is possible to skip many frames). ℃ recording) to normal recording (recording all video signals)
We have the means to increase the amount of information. In addition, by applying this to a general VTR, it is normally in a stopped state, and when an alarm is input, it is in a recording state, and information is recorded only when an alarm is input.
T.R.

also exists. Since this VTR shifts from a stopped state to a recording state, it takes several seconds to load, and there is a problem in that the initial few seconds, which are considered the most important in a monitoring device, are not recorded and are omitted. Incidentally, examples of the time lag video include, for example, Japanese Patent Application Laid-open No. 175288/1983.

[Problem that the invention seeks to solve]

An object of the present invention is to enable such a surveillance VTR to immediately enter the recording state when an alarm is input by placing it in a recording pause state (not in a stopped state before the good news is input), so that the recording state can be set immediately when an alarm is input. The purpose is to improve the recording of

[Means for solving problems]

The purpose of the above is to turn on the VTR (kC power is turned on), and after a certain period of time has passed, turn the VTR into a recording pause state (
The cylinder and capstan are rotating and the tape is lightly touching the cylinder, so you can immediately start recording by canceling the pause) or the VTR is stopped (you can also press the stop button and automatically stop the tape at the end of the tape). If you put the recording pause state after a certain period of time has elapsed after switching to (including), and then cancel the pause state and enter the recording state when an alarm is input, the period for this movement will be several minutes of the period from the stopped state to the recording state. This is achieved by significantly improving the situation in which the head area is not recorded for several seconds when an alarm is input.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

When the AC outlet is turned on, the power rectifier circuit 1.

At the same time, DC power is supplied to each circuit system of the VTR, an output for operation is output, and the recording switch means 2 and the pause switch means sy1 are turned on. Both switch means are input to a system control circuit 4, for example, a microcomputer, which controls the VTR, and this circuit controls the cylinder motor so that the VTR enters the recording pause state.

The drive circuit 5 that drives the cabnut motor (not shown) etc. is operated. When an alarm input is input in this state, the pause switch means 3 is turned on to cancel the recording pause state and enter the recording state. In this way, when an alarm is input, the recording state is immediately started. Even in the stopped state, it is possible to enter the recording halt state by means similar to the power supply rectifier circuit 1. Therefore, this VTR is normally in a recording pause state with a very high probability, and can immediately switch to a recording state upon input of an alarm.

〔Effect of the invention〕

According to the present invention, when an alarm is input, the few seconds immediately after the occurrence of an incident are recorded without any omissions, and the effect is significant.

[Brief explanation of the drawing]

The drawing is a block diagram showing an embodiment of the invention. 1...Power rectifier circuit. 2... Recording switch means. 6... Pause switch means. 4...System control circuit. 5... Drive circuit.

Claims (1)

[Scope of Claims] 1. A video tape recorder characterized by having means for suspending recording after a certain period of time has elapsed after the power is restored or after a stop operation. 2. The video tape recorder according to claim 1, wherein the video tape recorder cancels the recording pause state and enters the recording state in response to an alarm input.