KR960005941B1 - Detecting method & recording method of recording end signal - Google Patents

Abstract

checking whether a record signal currently detected is at a first level; whether the detected signal is at the first level, checking whether functions like "pause", "stop", and "power off" are being performed; and if it is checked that the record operation is completed, recording a record end signal on a control track of a tape.

Description

VTR recording end detection and setting method and recording end detection and recording method

1 is a diagram showing an example of a pattern of a magnetic recording tape for a VTR.

2 is a block diagram for inserting a recording end signal of the present invention onto a tape;

3 is a flowchart illustrating a recording end detection and setting process of the present invention.

4 is a flowchart illustrating a recording end signal detection and recording process of the present invention.

* Explanation of symbols for main parts of the drawings

1: recording end detection part 2: servo / ciscon part

3: recording end generation unit 4: deck

5: recording driving circuit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video tape recorder (VTR), and more particularly to a recording end detection and setting method and a recording end detection and recording method of a VTR, which enable recording from the end of an area recorded on a tape when recording. It is about.

As shown in FIG. 1, a signal recorded on a video tape includes an audio track A on which an audio signal is recorded, a video track B on which a video signal is recorded, and a control signal for controlling the position of a reproduction head. It is composed of a control track C for recording, and also shows a region I on which a video signal is recorded on a tape and a blank region II not recorded.

When a user generally records video and audio information to be recorded on the tape using a recording tape, the video and audio information may not be duplicated with an already recorded portion or may be recorded from the end portion before recording. Review the tape's contents on the TV screen. That is, in the VTR, in order to record after the end of recording after the recording, the VTR checks the point of time when the image information ends on the TV screen, and presses the stop or pause key to start recording.

However, since the VTR device receives a recording start signal and starts recording after waiting for 1 to 2 seconds, looking at the actual recorded part, the VTR device is duplicated on a part of the end of the already recorded image information or tape. There was a problem such that some areas of? Were not recorded.

This problem occurs because the user manually manipulates the recording standby command while monitoring the recorded state of the tape through the TV. Furthermore, the problem may be further exacerbated by the user's careless recording operation.

Accordingly, it is an object of the present invention to provide a recording end detection and setting method which automatically detects a position at which recording ends during recording on a tape and automatically enables a recording end signal to be set at that position.

It is still another object of the present invention to provide a recording end detection and recording method which automatically detects a recording end signal set on a tape and starts recording from the position of the signal when starting recording on the tape. .

According to an embodiment of the present invention, a method of detecting and setting a recording end of a VTR includes: detecting a current recording signal and determining whether the signal is a first level ('high' or 'low') signal; Determining whether the signal detected in the step is pause, stop, or power off because it is currently being recorded; And recording the recording end signal RES on the control track of the tape when it is determined that the recording is finished in the pause, stop, or power off determination step.

According to another embodiment of the present invention, a recording end detection and recording method of a VTR includes: inputting a recording command; Performing a rewind (REW) operation after the recording command input step; Determining whether a recording end signal (RES) is detected after the rewinding operation; When the RES is detected in the determining step, the RES is erased, and then the image information is recorded from the time of erasing.

Hereinafter, with reference to the accompanying drawings, the present invention will be described in detail.

The main principle of the present invention is an area in which a video signal is recorded, as shown in FIG. 1, in order to automatically detect a recording end position on a tape when recording video and audio information and to start recording at that detection position. Inserting the recording end signal RES as shown in the part on the control signal track C coinciding with the position where (I) ends, it is notified that arbitrary video and audio information can be recorded after this signal. Or it indicates that something has already been recorded up to the location of the signal. This is achieved by detecting the recording end position and inserting the recording end signal at that position, which can be recognized from signal detection such as power off, stop key input, pause key input or timer value in the case of scheduled recording. will be.

2 is a block diagram for inserting the recording end signal of the present invention, as shown in the drawing, the apparatus for inserting the recording end signal is a recording end detection unit (1), servo / sheath unit (2), recording end signal generation unit (3), the deck portion 4 and the recording drive circuit (5).

In the present invention configured as described above, the recording end detection unit 1 detects a falling edge at which the recording (REC) signal transitions from a high level to a low level, that is, a signal for a stop or pause or a power off mode. When detecting the input time of the signal, the detection signal is transmitted to the servo / syscon unit 2, and the servo / syscon unit 2 transmits the recording end signal RES in the generation unit 3. The deck unit 4 and the associated recording drive circuit 5 are controlled so that the output information provided is recorded as a pulse signal indicating 'RES' on the control C of the tape.

The hardware operation described above may be implemented in software in the scissor unit 2 as described later.

3 is a flowchart illustrating a recording end detection and setting method according to the present invention. As shown in step (1), it is determined whether the current record (REC) signal is at the current high level. If it is not at the high level, it is not related to the operation of the present invention, so that the routine 'A', that is, the next instruction is performed. If the recording (REC) signal of (1) is at high level, the recording is currently in progress, and therefore the sheath controller 2 kisses whether it is paused, stopped, or powered off as in step (7). To judge.

In step 7 (i.e., 2 to 4), it is determined that the recording is finished, and the process proceeds to step 5 where the RES is recorded on the control track C of the tape and proceeds to routine 'A'. At this time, the RES signal may be supplied through the output port of the sheath 2 or may use the output of the recording end generator 3 described above.

Described below is a description of the detection and recording process of the recorded RES when recording is desired.

Referring to FIG. 2 again, the recording end signal is detected by the recording end detection unit 1 by performing a rewind operation by the tape distance moving during the transition to the standby mode during the recording REC. When the detection signal is transmitted to the servo / scicon unit 2, the servo / ciscon unit 2 applies the REC signal to the deck 4 and the recording drive circuit 5 so that the deck 4 can be recorded from the end of the RES signal. ) And the associated driving circuit (5). At this time, in the present invention, the RES already recorded at the time of recording is erased through the erasing head, and at the end of the recording, the same operation as the above-described second or third degree is repeated.

4 is a control flowchart programmed in the sheath 2 at the time of recording in FIG. 2, in which step 10 is an input step of a recording command. When a write command is input, a rewind (REW) operation is performed in step 11, and then in step 12 it is determined whether the RES is detected. If RES is detected in step 12, the detected RES is erased as in step 13, and then image information is recorded from the time of erasure.

As described above, the recording end detection and setting method of the VTR according to the present invention has the advantage that the recorded information can be continuously recorded without overlapping.

Claims (2)

A recording end detection and setting method of a VTR, the method comprising: detecting a current recording (REC) signal and determining whether it is a first level ('high' or 'low') signal; Determining whether the signal detected in the step is pause, stop, or power off because it is currently being recorded; And recording the recording end signal (RES) on the control track of the tape when it is determined that the recording is finished in the pause, stop, or power off determination step. A recording end detection and recording method of a VTR, comprising: inputting a recording command; Performing a rewind (REW) operation after the recording command input step; Determining whether a recording end signal (RES) is detected after the rewinding operation; And if the RES is detected in the determining step, erasing the RES, and then recording the image information from the time point of erasing.