JPH07169143A - Recorded signal protector - Google Patents

Abstract

(57) [Summary] [Purpose] Only the necessary recorded signals on the magnetic tape can be protected, and other parts can be freely recorded. After the protected recorded signals are reproduced, (EN) Provided is a recorded signal protection device suitable for a video tape recorder capable of recording a signal. A linear track recording section 3 and a linear track recording control section 5 for writing a rewrite prohibition signal on a magnetic tape 6, and a linear track for reading the rewrite prohibition signal at the time of recording a signal on the magnetic tape 6 and reproducing the signal. The reproduction unit 1 and the rewrite prohibition signal detection unit 2, the main signal recording / reproduction control unit 12 that prohibits signal recording based on the rewrite prohibition signal when recording the signal, and the rewrite prohibition signal that erases the rewrite prohibition signal when reproducing the signal. And an erasing unit 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal protector for a signal recorded on a magnetic recording medium, and more particularly to a recorded signal protector suitable for use in a video tape recorder.

[0002]

2. Description of the Related Art A so-called video tape recorder is a video signal for displaying an image, a video signal including a synchronizing signal and a color signal, an audio signal for recording and reproducing audio,
The control signal for controlling the running speed of the magnetic tape and the cueing of the recorded signal are recorded on the magnetic tape, which is a magnetic recording medium, and the recorded signal is reproduced.

In many of the video tape recorders generally used at present, a video signal for displaying an image is recorded by a helical scanning method on a track formed obliquely with respect to a running direction of a magnetic tape, Audio signals and control signals are recorded on linear tracks formed in the running direction of the magnetic tape.

In such a video tape recorder, conventionally, a signal once recorded is erroneously erased,
To prevent the recorded signal from being erased by being overwritten, divide the magnetic tape into multiple areas so that continuous recording that spans the divided areas cannot be performed. A recorded mechanism is provided on the entire tape to protect the recorded signals.

[0005]

However, in the protection of the recorded signal of the conventional video tape recorder as described above, when the inside of the magnetic tape is divided, the recording over the divided area is not performed. In the case of a signal that can only fit in the divided area, it will be recorded as it is, and the recorded signal of that portion will be erased. However, there is a problem that only a signal having a length that can be stored in this divided area can be recorded.

Further, in the case where a protection mechanism is provided on the entire magnetic tape, if there is an unnecessary recorded signal in a part of the magnetic tape, the entire protection is released in order to use the unnecessary part. There was a problem that the necessary signal was accidentally erased because it was necessary.

Therefore, an object of the present invention is to protect only required recorded signals of the magnetic recording medium, and to freely record other portions, and after the protected recorded signals are reproduced. The purpose of the present invention is to provide a recorded signal protection device capable of recording a signal to that portion.

[0008]

The present invention for achieving the above object provides a recorded signal protection device for protecting a recorded signal recorded on a magnetic recording medium, which is rewritten to the magnetic recording medium. Rewriting prohibition signal writing means for writing a prohibition signal, and rewriting prohibition signal reading means for reading the rewriting prohibition signal at the time of recording a signal on the magnetic recording medium and reproducing a signal recorded on the magnetic recording medium. Recording signal rewriting prohibition means for suppressing erasure of a recorded signal and writing of a recording signal based on the rewriting prohibition signal when recording a signal on the magnetic recording medium, and at the time of reproducing the signal recorded on the magnetic recording medium. And a rewrite prohibition signal erasing means for erasing the rewrite prohibition signal.

Further, the recorded signal protection device of the present invention is
Fast-forwarding means is provided for fast-forwarding the magnetic recording medium based on the rewrite prohibition signal.

[0010]

According to the present invention constructed as described above, a signal is recorded on the magnetic recording medium based on the rewrite prohibition signal, and the rewrite prohibition signal is written on at least a part of the magnetic recording medium by the rewrite prohibition signal writing means. Is recorded. When a signal is to be recorded again in the portion of the magnetic recording medium where the rewrite prohibition signal is recorded, the rewrite prohibition signal is read by the rewrite prohibition signal reading means, so that the signal in this portion is protected. Since it is determined that the signal is recorded, it is possible to prevent the signal from being erroneously recorded.

Further, even when the recorded signal is reproduced, the rewrite prohibition signal reading means reads the rewrite prohibition signal, whereby it can be determined that the portion in which the rewrite prohibition signal is recorded has been reproduced at least once, and at the time of this reproduction. By erasing the detected rewrite prohibition signal by the rewrite prohibition signal erasing means, after the portion in which the rewrite prohibition signal is recorded is reproduced once, the signal can be recorded in that portion.

Further, by providing the fast-forwarding means,
When the rewrite prohibition signal is detected when the signal is to be recorded, the fast-forwarding means can fast-forward the magnetic recording medium to record the signal in a portion having no rewrite prohibition signal.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a block diagram for explaining a recorded signal protection function in a video tape recorder to which the recorded signal protection device according to the present invention is applied.

This video tape recorder includes a magnetic tape 6 (hereinafter simply referred to as a tape) as a magnetic recording medium,
A main signal recording / reproducing unit 11 for recording video signals and audio signals as a video tape recorder, a main signal recording / reproducing control unit 12 for controlling recording / reproducing of these video signals and audio signals, and fast-forwarding tape 6. A fast-forwarding drive unit 13 for controlling the fast-forwarding, a fast-forwarding control unit 14 for controlling the fast-forwarding, a device for controlling the running of the tape 6 (not shown), a power source, a device for processing a video signal and an audio signal, etc. Further, as a recorded signal protection device according to the present invention, a linear track reproducing section 1 which is a head for extracting a signal of a linear track, and a rewrite prohibition signal detecting section for detecting a rewrite prohibition signal from a signal extracted from the linear track. 2. Linear track recording unit, which is a head for writing signals to the linear track, and rewriting of the linear track is prohibited. A linear track recording control unit 5 for controlling the recording and erasing of the rewrite disable signal to the rewrite signal erasure unit 4 and the linear track is a head for erasing provided a degree.

The function and operation of each part of the recorded signal protection device in the video tape recorder of this embodiment will be described below separately for initial recording, recording in the signal protected state, and reproduction.

First, at the time of initial recording, the tape 6 is run for recording, and the linear track reproducing section 1 and the rewrite prohibition signal detecting section 2 function as rewriting prohibition signal reading means, and the linear track reproducing section 1 is operated. At, the linear track of the tape 6 is reproduced, and it is confirmed that the rewrite prohibition signal detection unit 2 has not detected the rewrite prohibition signal.
Main signal recording / reproducing control unit 12 to main signal recording / reproducing unit 1
A recording command is given to the recording medium 1 and the video signal and the audio signal are recorded on the respective tracks on the tape 6. At the same time, the linear track recording unit 3 and the linear track recording control unit 5 function as a rewriting prohibition signal writing means, and the linear track recording control unit 5 issues a rewriting prohibition signal recording command to the linear track recording unit 3 so that the tape 6 is recorded. The rewrite prohibition signal is recorded on the linear track of.

Here, the linear track is one of the tracks formatted on the tape 6, and is a track on which recording is continuously performed in the tape running direction. Then, the rewrite prohibition signal is recorded on this linear track as shown in FIG.

Next, the operation in the case where the rewrite prohibition signal is recorded on the linear track at the time of recording in the signal protection state, that is, at the time of initial recording as described above, and recording is attempted without being reproduced at all, will be described. . In this state, the tape 6 is run for recording, and the linear track reproducing section 1 and the rewrite prohibition signal detecting section 2 function as the rewrite prohibition signal reading means, and the linear track reproducing section 1 is The linear track of the tape 6 is reproduced. Then, the rewrite prohibition signal detection unit 2 detects the rewrite prohibition signal. As a result, the rewrite prohibition signal detection unit 2 sends a recording prohibition request to the main signal recording / reproduction control unit 12, and the main signal recording / reproduction control unit 12 issues a recording prohibition command to the main signal recording / reproduction unit 11. Recording of main signals such as video and audio signals is prohibited.

Further, the fast-forward drive section 13 and the fast-forward control section 14 function as a fast-forward means and the rewrite prohibition signal is detected. Therefore, the portion in which the write prohibition signal is detected is the portion without the rewrite prohibition signal. In other words, the signal is recorded by fast-forwarding to a portion that does not need to be protected, confirming that the rewrite inhibition signal is not detected, as in the case of the initial recording. This state is shown in FIG.

Next, at the time of reproduction, the tape 6 is run for reproduction, the linear track reproduction section 1 and the rewrite prohibition signal detection section 2 function as rewrite prohibition signal reading means, and the linear track reproduction section 1 At, the linear track of the tape 6 is reproduced, the portion in which the rewrite prohibition signal is recorded is reproduced, and the rewrite prohibition signal detection unit 2 detects the rewrite prohibition signal. Then, the rewrite prohibition signal erasing unit 4
And when the linear track recording control unit 5 functions as a rewriting prohibition signal erasing unit and the rewriting prohibition signal is detected during reproduction, it is notified to the linear track recording control unit 5 that the rewriting prohibition signal has been detected, A rewrite prohibition signal erasing command is sent to the rewrite prohibition signal erasing unit 4, and the rewriting prohibition signal of the linear track is erased as shown in FIG. At this time, the main signal recording / reproducing unit 11 reproduces the video signal and the audio signal from the respective tracks on the tape 6.

As a result, the portion of the tape 6 on which the rewrite prohibition signal is recorded is reproduced once, and the rewrite prohibition signal of that portion is erased, so that recording can be freely performed on this portion thereafter. become.

Therefore, by applying the recorded signal protection device of the present invention to the video tape recorder as in the above-mentioned embodiment, for example, when a television program is recorded once, as is used in a general home, once. However, when it is not being played back, the signal of that part is protected so that it is not erased accidentally. On the other hand, once viewed, it can be recorded and used again in that part.

[0024]

As described above, the recorded signal protection device of the present invention is suitable for use in a video tape recorder or the like, and a signal which has never been reproduced is erased or overwritten by a rewrite inhibit signal. However, since the rewrite prohibition signal is erased after being reproduced once, the recording can be performed again at that portion.

[Brief description of drawings]

FIG. 1 is a block diagram of a video tape recorder to which a recorded signal protection device according to the present invention is applied.

FIG. 2 is a diagram illustrating a linear track.

[Explanation of Codes] 1 linear track reproducing section 2 rewrite prohibition signal detecting section 3 linear track recording section 4 rewrite prohibition signal erasing section 5 linear track recording control section 6 tape 11 main signal recording / reproducing section 12 main signal recording / reproducing control section 13 Fast-forward drive section 14 Fast-forward control section

Claims (2)

[Claims] 1. A recorded signal protection device for protecting a recorded signal recorded on a magnetic recording medium, comprising: a rewrite prohibition signal writing means for writing a rewrite prohibition signal on the magnetic recording medium; Rewriting prohibition signal reading means for reading the rewriting prohibition signal at the time of recording the signal on the magnetic recording medium and at the time of reproducing the signal recorded on the magnetic recording medium, and the rewriting prohibition signal at the time of recording the signal on the magnetic recording medium. A recording signal rewriting prohibition means for suppressing erasing of a recorded signal and writing of the recording signal based on the rewriting prohibition signal erasing means for erasing the rewriting prohibition signal when the signal recorded on the magnetic recording medium is reproduced; A recorded signal protection device comprising: 2. The recorded signal protection apparatus according to claim 1, further comprising fast-forwarding means for fast-forwarding the magnetic recording medium based on the rewrite prohibition signal.