JPH03291076A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent appearance of a noise component onto split patterns in a reproduced pattern by providing a synchronizing signal detection circuit and a picture memory control section so as to stop the storage operation when no picture data exists. CONSTITUTION:An operator operates an operating section 10 to store a picture data into a memory 7 or a control section 9 is activated automatically after a prescribed time and the data is stored in the memory 7. In this case, a synchronizing signal detection circuit 17 detects the horizontal synchronization of a reproduced signal of a magnetic head 2 and sends a stop signal to the control section 9 when no signal is detected for several H periods. In this case, when the control section 9 is set to the storage operation mode, the operation is stopped. When the synchronizing signal detection circuit 17 detects the horizontal synchronizing signal again from the detecting state, the section 17 sends an operating start signal to the memory 9. When the reproduced video signal is interrupted during the storage to the memory 7, the picture storage operation for the part is stopped and when the signal is again reproduced, the storage operation is started to prevent a defect of storing noise component.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a magnetic recording and reproducing device that records and reproduces image information. For example, by recording a signal at the beginning of a magnetic tape and reproducing this image signal,
Applicable to video tape recorders capable of screen search.

(Prior Art) Generally, a plurality of image information may be recorded on a magnetic tape, and in this case, it is convenient to know which image information is recorded where on the magnetic tape. For this reason, among the various image information recently recorded on magnetic tape, a portion near the start of recording of each image information is extracted for a certain period of time, and each of the extracted image information is temporarily stored in an image memory. A video tape recorder has been provided that is capable of creating indexes of various information by recording all of the image information stored in this manner at the beginning of the magnetic tape.

FIG. 3 shows the electrical configuration of a conventional video tape recorder capable of recording indexes of various types of image information.

A magnetic head 22 that records image information on the magnetic tape 21 and reproduces the recorded image information is connected to a movable terminal C of a first changeover switch 23, and one fixed terminal of the first changeover switch 23. The output of the recording circuit 24 is shown in a.
The inputs of the reproducing circuit 25 are respectively connected to the other fixed terminals.

Further, a second changeover switch 2 is connected to the input of the recording circuit 24.
The movable terminal C of the second changeover switch 26 is connected to one fixed terminal a of the second changeover switch 26, and the video input received by an antenna (not shown) is connected to the other fixed terminal.
The outputs of the image memory section 27 are connected to each other.

On the other hand, the output of the reproduction circuit 25 is transferred to the third changeover switch 33.
It is connected in a straight line to one fixed terminal a of the third selector switch 33 via the image memory section 27.

The movable terminal C of the third changeover switch 33 is led to a monitor or the like as a video signal.

Further, the output of the control head 34 is guided to the control signal reading section 31, and the output of the control signal reading section 31, which reads the address information signal from the control signal, is guided to the control section 28, which controls the operation of each section. It's dark. The control section 28 is led to the output of an operation section 30 having various operation mode buttons. Further, the control section 28 sends a switching control signal to each control input of the first changeover switch 23, the second changeover switch 26, and the third changeover switch 33, and also sends a changeover control signal to the tape running control section 32. A travel control signal is being sent out. Also,
The control section 28 and the image memory control section 29 that sends operation control signals to the image memory section 27 are bidirectionally connected.

Next, the operation of the video tape recorder having the above configuration will be explained.

It is assumed that various types of image information (video signals) have already been recorded on the magnetic tape 21.

Load these two magnetic tapes into a video tape recorder,
First, operate the operation unit 30 to enter the fast forward mode. Thereby, the control section 28 controls the tape running control section 32 to fast-forward the magnetic tape 21. At this time, the control signal detected from the control trunk of the magnetic tape 21 by the control head 34 is input to the control signal reading section 31. The control signal reading section 31 reads a high speed cueing signal (VrSS) from the input control signal and sends the detection signal to the control section 28 . The control section 28 controls the tape running control section 32 based on this detection signal, so that the magnetic tape 2
1 is further run at a predetermined fast forward rate, and then transferred to the playback state, and at the same time, a start signal is sent to the image memory control section 29, and the image memory section 27 is put into the operating state.

After the VISS signal is detected, the magnetic tape 21 is further run at a predetermined fast forward speed in order to avoid unwanted parts such as commercials being recorded at the beginning and reproduce the original image. be. Further, the control unit 28 sends a switching control signal to each changeover switch 23, 26.33, and performs a switching operation of each changeover switch 23, 26.33. That is, the first changeover switch 23
connects the movable terminal C to the fixed terminal side, and the third changeover switch 33 connects the movable terminal C to the fixed terminal side.

Further, the second changeover switch 26 may be connected to either fixed terminal in this state.

As a result, the reproduced FM signal reproduced from the magnetic tape 21 by the magnetic head 22 is transferred to the first changeover switch 23.
is guided to the reproduction circuit 25 via the image memory section 2.
7 to the third selector switch 33, and is sent to a monitor (not shown) via terminals b-c of the switch 33. Therefore, the operator operates the operating section 30 at an appropriate time while viewing the image displayed on the monitor, thereby causing the image memory section 27 to store the image data. Alternatively, the image memory control section 29 automatically operates after a certain period of time and causes the image memory section 27 to store the image data. This image data is stored in a predetermined storage area in the image memory section 27 as divided image data corresponding to the divided screen that is not stored. Thereafter, the control section 28 sends a control signal to the tape running control section 32 again instructing the fast forward mode, and controls the tape running control section 32 to fast forward the magnetic tape 21. Then, the control signal reading section 3
When the high-speed cue signal (VISS) is read again by 1, the same operation as above is performed, and the image data at that time is used as divided image data corresponding to the divided screen that has not been stored. It is stored in a predetermined storage area within the image memory section 27. Repeat this action N times,
When the number of split screens in one screen reaches N (for example, 9),
The operator operates the operation unit 30 to put the magnetic tape 21 into rewind mode. The control section 28 controls the tape running control section 32 in response to a signal from the operation section 30 to rewind the magnetic tape 21 to the beginning.

Thereafter, the operator operates the operation unit 30 to set the image memory to recording mode. The control unit 28 sends a switching control signal to each changeover switch 23, 26, 33 based on the signal from the operation unit 30, and
．． Perform 33 switching operations. That is, the first changeover switch 23 connects the movable terminal C to the fixed terminal a side, and connects the movable terminal C to the fixed terminal a side.
The changeover switch 26 connects the movable terminal C to the fixed terminal side. Further, the third changeover switch 33 may be connected to either fixed terminal side in this state. Further, the control section 28 controls the tape running control section 32 to bring the magnetic tape 21 into a recording state.

Furthermore, the control unit 28 sends a signal instructing the image memory control unit 29 to a recording mode, and puts the image memory unit 27 into a recording operation state on the magnetic tape 21.

As a result, image data indicating all the stored split screens is sent from the image memory section 27 to the fixed terminal of the second changeover switch 26 as a split image signal to be displayed on one screen. It is led to the recording circuit 24 via the second changeover switch 26, and is further led to the first changeover switch 23.
The signal is supplied to the magnetic head 22 via the magnetic tape 21, and is recorded on the leading portion of the magnetic tape 21.

(Problem B to be Solved by the Invention) However, in the conventional video tape recorder described above, when storing image data in the image memory section 27,
Since the storage operation is performed without checking the presence or absence of image data, if the storage operation is performed while the unrecorded portion of the magnetic tape is being played back, the image data becomes only noise components. was there. For example, if the image data when the ν■ss signal is detected four times is an unrecorded portion, the fourth divided image will become a noise screen on the display screen, as shown in Figure 4. Put it away. In the same figure, the numbers with ○ attached to each split screen,
The numbers with zeros attached to the magnetic tape correspond. Therefore, the operator has to repeat the same operation N times from the beginning, making the operation extremely troublesome.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a magnetic recording and reproducing device that detects the presence or absence of image data and stops the storage operation in the image memory section where there is no image data. It's about doing.

(Means for Solving the Problems) In order to solve the above problems, the magnetic recording and reproducing apparatus of the present invention includes a control signal reading section that detects an address information signal from a magnetic tape and sends out the detection signal, A tape running control unit that runs the magnetic tape a predetermined distance each time a detection signal is sent from the control signal reading unit and then plays it back for a predetermined time; and a magnetic tape playback signal controlled by the tape running control unit when storing data. are sequentially stored as image data corresponding to the split screens that have not been stored, and at the same time, when sending out the data, simultaneously transmitting the image data representing all the stored split screens, the split screens can be combined into one screen. Applied to a magnetic recording and reproducing device comprising an image memory section that sends out multiple image signals to be displayed, and a control section that performs control to record the multiple image signals from the image memory section on a leading portion of a magnetic tape, the control Based on the detection signal from the signal reading section,
When a magnetic tape that has been run for a predetermined distance is being played back for a predetermined time, a synchronization signal detection section detects a synchronization signal included in the playback signal, and based on the detection result of this synchronization signal detection section, if a synchronization signal is not detected, The image memory control section controls the operation of the image memory section to be stopped and, when a synchronization signal is detected, to start the operation of the image memory section.

(Function) With the above configuration, when the synchronization signal detection unit does not detect the synchronization signal, since no image data is recorded on the playback portion of the magnetic tape, the operation of the image memory unit is stopped and the synchronization signal is detected. When this happens, since image data is recorded on the reproduced portion of the magnetic tape, the operation of the image memory section is started.

As a result, even if the magnetic tape includes a non-recorded portion, this non-recorded portion is not stored in the image memory section, so that no noise component appears on the divided screen within the playback screen.

(Example) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the electrical configuration of a video tape recorder according to the present invention.

In the figure, a magnetic head 2 that records image information on a magnetic tape 1 and reproduces the recorded image information is connected to a movable terminal C of a first changeover switch 3. The output of the recording circuit 4 is connected to one fixed terminal a, and the input of the reproducing circuit 5 is connected to the other fixed terminal a. Furthermore, a movable terminal C of a second changeover switch 6 is connected to the input of the recording circuit 4, and one fixed terminal a of the second changeover switch 26 receives an image received by an antenna or the like (not shown). The outputs of the image memory section 7 are connected to the other fixed terminals.

On the other hand, the output of the reproducing circuit 5 is connected in a straight line to one fixed terminal a of the third changeover switch 13, and is also connected to the other fixed terminal a of the third changeover switch 13 via the image memory section 7. The video signal is further led to a synchronization signal detection section 17 that detects a synchronization signal from the video signal. The movable terminal C of the third changeover switch 13 is led to a monitor or the like as a video signal. In addition, the synchronization signal detection section 17
The output is led to the image memory control section 9.

When the signal from the synchronization signal detection section 17 is a signal indicating that no synchronization signal has been detected, the image memory control section 9 stops the storage operation of the image memory section 7 and stops the signal from the synchronization signal detection section 17. When the signal is a signal indicating that a synchronization signal has been detected, the image memory section 7 is controlled to be in the operating state again.

The output of the control signal 14 is led to the control signal reading section 11, and the output of the control signal reading section 11, which reads the address information signal from the control signal, is sent to the control section 8, which controls the operation of each section. being guided. The control section 8 is led to the output of an operation section IO having various operation mode buttons. In addition, the control unit 8
A switching control signal is sent to each control input of the first changeover switch 3, second changeover switch 6, and third changeover switch 13, and a travel control signal is sent to the tape travel control section 12. It is being sent out.

Further, the control section 8 and the image memory control section 9 which sends operation control signals to the image memory section 7 are bidirectionally connected.

Next, the operation of the video tape recorder having the above configuration will be explained.

The magnetic tape 1 already contains various image information (video signals).
Suppose that is recorded.

This magnetic tape 1 is loaded into a video tape recorder, and the operating section 10 is operated to first set the fast forward mode. As a result, the control section 8 controls the tape running control section 12 to
Fast forward magnetic tape 1.

At this time, the control signal detected from the control trunk of the magnetic tape 1 by the control head 14 is input to the control signal reading section 11. The control signal reading unit 11 reads a high-speed cue signal (VISS) from this input control signal,
The detection signal is sent to the control section 8. The control section 8 controls the tape running control section 12 based on this detection signal, and
After the magnetic tape 1 is further run by a predetermined amount of fast forwarding, the magnetic tape 1 is moved to the playback state, and at the same time, an activation signal is sent to the image memory control section 9 to put the image memory section 7 into the operating state.

After the VISS signal is detected, the magnetic tape 1 is further run at a predetermined fast forward speed in order to avoid unnecessary parts such as commercials being recorded at the beginning and reproduce the original image. be. In addition, the control unit 8
sends a switching control signal to each changeover switch 3.6.13, and performs a switching operation of each changeover switch 3.6.13.

That is, the first changeover switch 3 connects the movable terminal C to the fixed terminal side, and the third changeover switch 13 connects the movable terminal C to the fixed terminal side. Further, the second changeover switch 6 may be connected to either fixed terminal in this state.

As a result, the reproduced FM signal reproduced from the magnetic tape 1 by the magnetic head 2 is guided to the reproduction circuit 5 via the first changeover switch 3, and further passes through the image memory section 7 to the third changeover switch 13. It is sent to a monitor (not shown) via terminals b-c of the switch 13. Therefore, the operator operates the operating section 10 at an appropriate time while viewing the image displayed on the monitor to cause the image memory section 7 to store the image data. Alternatively, the image memory control section 9 automatically operates after a certain period of time and causes the image memory section 7 to store the image data.

At this time, the synchronization signal detection section 17 detects a synchronization signal (in this case, a horizontal synchronization signal) included in the video signal reproduced by the magnetic head 2.

When the horizontal synchronization signal is not detected by several H (H: horizontal synchronization) amount, an operation stop signal is sent to the image memory control section 9.

At this time, if the image memory control section 9 is in an operation mode for storing image data in the image memory section 7 according to an instruction from the control section 8, the storage operation is stopped. Furthermore, when the synchronization signal detection section 17 detects a horizontal synchronization signal again from a state in which no horizontal synchronization signal has been detected, it sends an operation start signal to the image memory control section 9.

At this time, if the image memory control section 9 is forcibly in the stop mode even though it is in the storage operation mode of image data in the image memory section 7 according to an instruction from the control section 8, the The storage operation of the image data into the image memory section 7, which has been in progress, is started.

That is, if the reproduced video signal is interrupted during the operation of storing image data in the image memory section 7, the storage operation of the image data of that part is stopped, and when the video signal is reproduced again, the storage of the image data is stopped. By starting the operation,
This eliminates the conventional problem of memorizing noise parts.

The image data stored in this manner is stored in a predetermined storage area in the image memory unit 7 as divided image data corresponding to the divided screen that has not been stored. After that, the control section 8 sends a control signal to the tape running control section 12 again instructing the fast forward mode, and the tape running control section 12
is controlled to fast-forward the magnetic tape 1. Then, the control signal reading unit 11 again sends a high-speed cue signal (
VISS) is read, the same operation as above is performed, and the image data at that time is stored in a predetermined storage area in the image memory unit 7 as divided image data corresponding to the divided screen that has not been stored. Remember. N
Repeatedly, the number of split screens in one screen is N (for example, 9)
When reaching this point, the operator operates the operating section 10 to put the magnetic tape 1 into rewind mode. The control unit 8 includes an operation unit 10
The tape running control section 12 is controlled by the signal from the
The magnetic tape 1 is rewound to the beginning.

Thereafter, the operator operates the operation unit 10 to set the p-image memory to recording mode. The control unit 8 sends a switching control signal to each changeover switch 36.13 in response to a signal from the operation unit 10, and performs a switching operation of each of the changeover switches 3, 6.13. , the first changeover switch 3 connects the movable terminal C to the V constant terminal a side, and the second changeover switch 6 connects the movable terminal C to the fixed terminal side. may be connected to the tilted fixed terminal side in this state.The control section 8 also controls the tape running control section 12 to bring the magnetic tape 1 into the recording state.Furthermore, the control section 8 , sends a signal instructing the recording mode to the image memory control unit 9, and puts the image memory unit 7 into a recording operation state on the magnetic tape 1.

As a result, the image data indicating all the stored split screens is sent from the image memory unit 7 to the fixed terminal of the second switching screen as a split image signal to be displayed on one screen. The signal is guided to the recording circuit 4 via the first selector switch 6, and further supplied to the magnetic head 2 via the first selector switch 3, where it is recorded on the leading portion of the magnetic tape 1.

As explained above, according to the magnetic recording and reproducing apparatus of the present invention, when storing image data in the image memory section 7, the presence or absence of image data is checked before performing the storage operation. Even when a storage operation is performed during playback of a non-recorded portion of the image data, the problem that noise components are stored in the image data can be solved. For example, VISS
Even if the video signal when the signal is detected four times includes a non-recorded part, as shown in FIG. Since the video signals before and after (except before and after) are stored as image data, the video also appears in the fourth divided image on the display screen. In FIG. 2, the numbers with O attached to each divided screen correspond to the numbers with O attached to the magnetic tape.

In the above embodiment, the synchronization signal detection section 17 detects the horizontal synchronization signal, and in order to store only the clearest possible image, the image memory control section 9 is set to the stop mode when the interruption occurs for several hours. However, the discontinuous interval is not limited to several H. In addition, the synchronization signal detection section 1
It is possible to detect a vertical synchronization signal at 7 and control the operation of the image memory control section 9 depending on the presence or absence of the vertical synchronization signal.

(Effect of the invention) The magnetic recording and reproducing device of the present invention includes a synchronization signal detection section,
When no synchronization signal is detected, no image data is recorded on the playback section of the magnetic tape, so the operation of the image memory section is stopped, and when a synchronization signal is detected, image data is recorded on the playback section of the magnetic tape. The structure is configured so that the image memory section starts operating based on what is recorded, so even if the magnetic tape contains unrecorded areas,
This eliminates the problem that this unrecorded portion is stored as image data in the image memory section.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the electrical configuration of the magnetic recording/reproducing device of the present invention, and FIG. 2 is a diagram showing index information stored at the beginning of a magnetic tape displayed on a 9-split screen by the same device. , FIG. 3 is a block diagram showing the electrical configuration of a conventional magnetic recording/reproducing device, and FIG. 4 is a diagram showing index information stored at the beginning of a magnetic tape displayed on a 9-split screen by the same device. It is. ...Magnetic tape...Magnetic head...First selector switch...Recording circuit...Reproducing circuit...Second selector switch...Image memory section...Control section... Image memory control section...Operation section 1...Control signal reading section 2...Tape running control section 3...Third changeover switch 4...Control head Fig. 2 Fig. 4 Noise component

Claims (1)

[Scope of Claims] 1) A control signal reading unit that detects an address information signal from a magnetic tape and sends out the detection signal, and a control signal reading unit that moves the magnetic tape every time a detection signal is sent from the control signal reading unit. A tape running control unit that causes the tape to run for a fixed amount of time and then reproduces it for a predetermined time; and when storing data, a magnetic tape playback signal under the control of the tape running control unit is sequentially converted into image data corresponding to a split screen that is not stored. an image memory unit that stores the image data and simultaneously sends out image data representing all the stored split screens at the time of data transmission, thereby sending out the split screens as a plurality of image signals that display the split screens in one screen, and this image memory unit; In a magnetic recording/reproducing apparatus, the magnetic recording/reproducing apparatus is equipped with a control unit that controls recording of multiple image signals from a plurality of image signals on a leading portion of the magnetic tape, based on a detection signal from the control signal reading unit. During time playback, a synchronization signal detection section detects a synchronization signal included in the reproduced signal, and based on the detection result of this synchronization signal detection section, when no synchronization signal is detected, the operation of the image memory section is stopped. 1. A magnetic recording and reproducing apparatus comprising: an image memory control unit that controls the image memory unit to start operating when a synchronization signal is detected.