JPH0765557A - Image retrieval and magnetic recorder/reproducing apparatus - Google Patents

Abstract

PURPOSE:To retrieve an image scene securely even if the recording period of the scene is very short. CONSTITUTION:Date and time data which are generated by a date and time generating means 3 are recorded on a magnetic tape 1 by a recording/ reproducing means 2 through a rotary head together with image voice signals. A data detecting means 4 detects the date and time data from reproduced signals and transmits the data to a comparing means 5 and the reproduced signals are supplied to an image output means 8. An input means 6 outputs the retrieval data of date and time which are inputted by a user with keys and a retrieval request which notifies the start of the retrieval. The comparing means 5 compares the date and time data with the retrieval data and, if both of the data agree with each other, outputs a stop request. A tape driving control means 7 starts the running of the magnetic tape 1 in accordance with the retrieval request and stops the running in accordance with the stop request. The image output means 8 detects the image voice signals and the date and time data from the reproduced signals and supplies them through an output terminal 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video scene retrieving function, and more particularly, recording the date and time together with digital video and audio data on a magnetic tape, and reproducing the video and audio data and the date and time data from the magnetic tape by a rotary head. The present invention relates to a magnetic recording / reproducing device.

[0002]

2. Description of the Related Art In recent years, the popularity of VHS video tape recorders (hereinafter abbreviated as VTRs) has increased considerably, and there has been a particular demand for operability and easy-to-understand displays that can be used by anyone.

Searching for a recorded scene in a conventional VTR is performed in the following procedure. In the conventional VHS type VTR, the phase control of the magnetic tape running is performed so that the rotary head scans along the recording track recorded on the magnetic tape during reproduction. In order to perform phase control, a fixed head is used during recording to record a control signal (hereinafter abbreviated as CTL) at the lower end of the magnetic tape. Usually C
The TL is recorded with a duty ratio of 1: 1. However, there is a planning rule called a video index search system (hereinafter abbreviated as VISS) in order to search for recorded scenes, and as a search signal (hereinafter abbreviated as VISS signal) at the recording start position on the magnetic tape. Recording is performed for about 2 seconds while changing the duty ratio of CTL. VISS during playback
By detecting the signal, it is possible to search for the beginning of the recorded scene.

A digital audio tape recorder (DAT) can record a calendar time together with an audio signal in a subcode area on a magnetic tape, and can detect a discontinuity point of the calendar time to detect a final recording point. (Japanese Patent Laid-Open No. 62-134840).

[0005]

However, when a large number of recorded scenes are recorded at a short recording interval by the VTR with a built-in camera and an attempt is made to search for one scene, the VISS signal must be recorded for at least 2 seconds. You cannot search recorded scenes that are shorter than 2 seconds. Further, in the VISS signal, it is necessary to remember information about the number of the recorded scene to be searched from the first recorded scene. Alternatively, the search operation cannot be performed unless the search operation is repeated for each scene and the playback output screen is checked. Further, there is a problem that the search using the VISS signal is not performed in the recording standby state.

In the DAT recording end point detection method,
It has a problem that it cannot be used when it is desired to retake from the previous recorded scene.

The present invention solves the above-mentioned conventional problems. When recording a video signal, the recorded date and time are recorded on a magnetic tape, and the data is recorded by detecting the data by a detecting means. It is an object of the present invention to provide a magnetic recording / reproducing apparatus capable of searching recorded scenes by date and time, capable of searching even shortest recorded scenes, and realizing a very simple and highly accurate search function.

[0008]

In order to achieve this object, a magnetic recording / reproducing apparatus of the present invention comprises a date and time generating means for generating date and time when a video and audio signal was recorded as date and time data, and a video and audio signal and date and time. Recording / reproducing means for recording / reproducing data on / from a magnetic tape, and date / time data is detected from the reproduction signal reproduced by the recording / reproducing means, and the date / time detected this time when the date / time data previously detected is different from the date / time data currently detected Data detection means for outputting data, input means for outputting one or more values among year, month, day, hour, minute, second as search data and outputting a search request when a search start is requested from the outside, and the data detection Comparing the date and time data output from the means with the search data, and outputting a stop request when they match, and a magnetic tape running control according to the search request A control means for stopping the running of the magnetic tape in response to the stop request, and a video output means for detecting a video signal and a date / time signal from the reproduction signal at the position where the magnetic tape is stopped by the stop signal and outputting them to an output terminal. I have it.

The magnetic recording / reproducing apparatus of the present invention is a recording / reproducing device for recording / reproducing the audio / video signal and the date / time data on a magnetic tape, and a date / time generating means for generating the date / time when the image / audio signal was recorded as the date / time data. Means, data detecting means for detecting date / time data from the reproduction signal reproduced by the recording / reproducing means and outputting the date / time data, input means for transmitting a search request by an external input, and running of the magnetic tape. A moving amount detecting means for detecting the moving amount of the magnetic tape and outputting a sampling signal every time the moving amount reaches a predetermined value, date and time data at the start of running the magnetic tape, and the arrival time of the sampling signal. A calculating unit that outputs a reversal request when the difference from the date and time data does not match the predetermined value, and a constant that reduces the predetermined value by the reversal request. If the predetermined value is less than or equal to the threshold value when it is detected that the output cycle of the inversion request is equal to the output cycle of the sampling signal, the date and time data output from the data detection means is incorrect. Discontinuity detection means for detecting the continuation and outputting a stop request, the running of the magnetic tape is started by the search request, the running direction of the magnetic tape is reversed by the inversion request, and the stop request is issued by the stop request. And a tape drive control means for stopping the running of the magnetic tape.

Further, the magnetic recording / reproducing apparatus of the present invention records / reproduces the video / audio signal and the date / time data on the magnetic tape, and the date / time generating means for generating the date / time / minute / second as the date / time data at the time of recording the video / audio signal. Recording / reproducing means, data detecting means for detecting date / time data from a reproduction signal reproduced by the recording / reproducing means, and outputting the date / time data when there is a change, and input means for transmitting a search request by an external input A moving amount detecting means for detecting a moving amount of the magnetic tape while the magnetic tape is running and outputting a sampling signal when the moving amount becomes equal to a predetermined value; date and time data at the start of running the magnetic tape and the sampling. Arithmetic means for outputting a reversal request when the difference from the date and time data at the time of arrival of the signal does not match the predetermined value; and the predetermined value according to the reversal request. When the constant changing means for decreasing and the output cycle of the inversion request become equal to the output cycle of the sampling signal, if the predetermined value is less than or equal to a threshold value, the date and time output from the data detecting means A discontinuity detection means for detecting that the data has become discontinuous and outputting a stop request; and an image memory for detecting a video signal from the reproduction signal and storing at least two screens while updating the video data. An image synthesizing unit for terminating the update of the image memory in response to the stop request, compressing and synthesizing the video data stored in the image memory and outputting as a video signal for one screen, and running the magnetic tape in response to the search request And a tape drive control means for reversing the traveling direction of the magnetic tape in response to the reversal request and stopping the traveling of the magnetic tape in response to the stop request. Eteiru.

[0011]

According to the present invention, by providing the date and time generating means and the data detecting means, it is possible to search the recorded scene by the date and time when the video was recorded. The date and time when was recorded can be displayed on the same screen.

Further, according to the present invention, with the above-mentioned structure, it is possible to detect the joint between the recorded scenes recorded by the discontinuity detecting means and the movement amount detecting means and stop the magnetic tape at that position.

Further, according to the present invention, with the above construction, the joint between recorded scenes recorded by the discontinuity detecting means and the movement detecting means is detected, the magnetic tape is stopped at that position, and the image before and after the joint is formed by the image synthesizing means. Can be displayed on one screen.

[0014]

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

FIG. 1 is a block diagram showing the circuit arrangement of an image search operation unit of a magnetic recording / reproducing apparatus (VTR) according to the first embodiment of the present invention. In FIG. 1, the date generation means 3
When recording, the date and time are sent to the recording / reproducing means 2 as date and time data. The recording / reproducing means 2 records the date / time data together with the video / audio signal on the magnetic tape 1 via a rotary head (not shown), and at the time of reproduction, the video / audio signal and the date / time data from the magnetic tape 1 via the rotary head as a reproduction signal. It is sent to the data detection means 4. The data detection means 4 detects the date and time data from the reproduction signal, sends it to the comparison means 5, and outputs the reproduction signal to the video output means 8. When the user inputs a date or time recorded in a recorded scene to be searched by a key operation by the user, the input unit 6 sends it as search data to the comparison unit 5 and sends a search request notifying the start of the search to the tape drive control unit 7. Send out. The comparing means 5 compares the date / time data with the search data, and when they match, outputs a stop request to the tape drive control means 7 and the video output means 8. The tape drive control means 7 inputs a search request to input the magnetic tape 1
Is started, and a stop request is input to stop the running of the magnetic tape 1.

The video output means 8 inputs the stop request, detects the video signal and the date and time data from the reproduced signal, and outputs the output terminal 1.
Output to 0.

The operation of the magnetic recording / reproducing apparatus according to the first embodiment of the present invention constructed as described above will be described with reference to FIGS.
Will be described with reference to FIG.

The magnetic recording / reproducing apparatus of this embodiment is an apparatus for recording / reproducing a video / audio signal as digital data on a magnetic tape, and a video signal area, an audio signal area and an index area are allocated in one track. In the index area, absolute time information, relative time information such as date and time, and a signal for cueing can be recorded. FIG. 2 shows the structure of date and time data. The date / time data is assigned a capacity of 1 byte for each of the year, month, day, hour, minute, and second, and is recorded / reproduced in the index area on the magnetic tape as 6-byte data in total.

The operation of the data detecting means 4, the comparing means 5, and the inputting means 6 will be described with reference to FIG. FIG. 3 is a flow chart showing the processing flow of the data detecting means 4, the comparing means 5, and the input means 6.

First, in branch 501, the parameter A is 0
Determine if When the parameter A is 0, the operation process of the input means 6 is executed. First branch 5
In 04, it is determined whether or not it is the search mode. In the search mode, the search data input by the user is set in the memory 0 in step 505, and the parameter A is set to 1 in step 506. If it is not the search mode, the process proceeds to the next process with the parameter A set to 0.

Next, when the parameter A is 1, the operation processing of the data detecting means 4 is performed. When the parameter A is 1 in branch 502, the process proceeds to branch 507, it is determined whether date / time data is detected from the reproduction signal, and if detected, the date / time data detected in step 508 is set in the memory 1, Parameter A is set to 2 at 509
Set to. When the date and time data is not detected, the parameter A is set to 1 and the process proceeds to the next step.

Further, when the parameter A is 2, the processing of the comparing means 5 is executed. When the parameter A is 2 in branch 503, memory 0 and memory 1 in branch 510
It is determined whether or not the difference between and is 0. That is, it is determined whether the date / time data and the search data are the same. When both are equal, a stop request is output to the tape drive control means 7 in step 511, the search mode is canceled and the parameter A is set to 0 in step 512. Branch 510
If memory 0 and memory 1 are not equal in step 5, step 5
The parameter A is set to 1 in 13 and the process proceeds to the next step.

By performing the above processing, when the user sets the search data and inputs the search start, the input means 6 sends the search data setting and the search start, and the data detecting means 4 detects the date and time data from the reproduced signal. Then, each time it is detected, the date / time data is sent to the comparing means 5. Comparison means 5
Compares the search data sent from the input means 6 with the date / time data sent from the data detection means 4, and when they are equal, outputs a stop request to the tape drive control means 7,
The search operation can be completed.

Next, the operation of the video output means 8 will be described.
The video output unit 8 inputs the stop request output from the comparison unit 5 when the search is completed, detects the video signal and the date / time data from the reproduction signal, and outputs the video signal and the date / time data to the output terminal 10. Therefore, if a monitor is connected to the output terminal 10 when the search is completed, the video and the recorded date and time can be confirmed on the monitor.

The data detecting means 4, the comparing means 5, the inputting means 6 and the tape drive controlling means 7 of this embodiment are realized by software of a microprocessor, but hardware alone or a mixture of software and hardware is used. Even if it does, the effect of the present invention does not change.

FIG. 4 is a block diagram showing the circuit arrangement of the image search operation unit of the magnetic recording / reproducing apparatus (VTR) in the second embodiment of the present invention. In FIG. 4, the date generation means 3
Sends the shooting date and time to the recording and reproducing means 2 as date and time data. The recording / reproducing means 2 records the date / time data together with the video / audio signal on the magnetic tape 1 via a rotary head (not shown), and at the time of reproduction, the video / audio signal and the date / time data from the magnetic tape 1 via the rotary head as a reproduction signal. It is sent to the data detection means 4. The data detecting means 4 detects the date and time data from the reproduced signal and calculates the calculating means 11 and the discontinuity point detecting means 1.
It sends to 4. The input unit 15 outputs a search request to the tape running control unit 16 and the movement amount detection unit 12 when the user inputs a search start by a key operation. The movement amount detecting means 12 inputs a signal (hereinafter abbreviated as FG signal) proportional to the rotation period of the capstan motor controlling the running of the magnetic tape 1 from the tape drive control means 16 and inputting a search request. The amount of movement of the magnetic tape 1 is detected, and when the amount of movement becomes equal to the set predetermined value, a sampling signal is output to the calculating means 11 and the discontinuity detecting means 14. The calculating means 11 reads the date and time data from the data detecting means 4 each time the sampling signal is inputted, and when the difference from the date and time data at the time of starting the search is not equal to the moving amount of the magnetic tape 1, the tape drive control means is issued. 16, discontinuity detecting means 14, constant changing means 13
Output to. When the inversion request is input, the constant changing means 13 decreases the predetermined value which determines the output cycle of the sampling signal in the movement amount detecting means 12. The predetermined value is also used as the same value in the calculation means 11 and the discontinuity detection means 14. The discontinuity detecting means 14 inputs the date and time data, the inversion request, the sampling signal and the changed predetermined value to detect the discontinuity and outputs a stop request to the tape drive control means 16. The tape drive control means 16 starts running of the magnetic tape 1 in response to a search request, and the magnetic tape 1 in response to a reversal request.
The running direction of the magnetic tape 1 is reversed and the running of the magnetic tape 1 is stopped by a stop request. Further, the FG signal is sent to the movement amount control means 12
Is output to.

The operation of the magnetic recording / reproducing apparatus according to the second embodiment of the present invention constructed as described above will be described with reference to FIGS.
It will be described in detail with reference to FIGS. 5 and 6.

The magnetic recording / reproducing apparatus of this embodiment is an apparatus for recording / reproducing a video / audio signal as digital data on a magnetic tape, and a video signal area, an audio signal area and an index area are allocated in one track. In the index area, absolute time information, relative time information such as date and time, and a signal for cueing can be recorded. FIG. 2 is a configuration diagram showing the configuration of date and time data. The date / time data is assigned a capacity of 1 byte for each of the year, month, day, hour, minute, and second, and is recorded / reproduced in the index area on the magnetic tape as 6-byte data in total.

Next, the operation of the movement amount detecting means 12 will be described with reference to FIG. FIG. 5 is a flowchart showing the flow of the operation of the movement amount detecting means 12.

First, the branch 601 determines whether or not it is in the search mode. If it is in the search mode, the process of detecting the movement amount of the magnetic tape is executed. If it is not in the search mode, the next process is performed. In the branch 602, it is determined whether or not the search request or the inversion request is output, and if it is output, the FG counter is cleared and the process proceeds to the branch 604. The branch 604 detects whether or not the leading edge of the FG signal has arrived, and when it has arrived, the process proceeds to step 605. In step 605, the edge count of the incoming FG signal is counted. In step 606, FG
The count value of the signal is converted into time data and stored in the memory 3. That is, branch 602 to step 606
With the above processing, the amount of movement of the magnetic tape moved in the search operation is detected every time the FG signal arrives. Next, in the branch 607, the memory 3 in which the movement amount is stored
Is compared with a predetermined value and when they are equal, step 608
The sampling signal is output with and the FG counter is cleared in step 609. That is, since the sampling signal is output when the movement amount of the magnetic tape reaches a constant value by the processing of the branch 607 to step 609, the output cycle of the sampling signal can be changed by a predetermined value.

The predetermined value will be described with reference to (Table 1). (Table 1) is a table showing the contents of predetermined values stored as table ROM data.

[0032]

[Table 1]

Ts is an address pointer for reading a predetermined value from the table ROM, which is changed and set by the constant changing means 13. Predetermined value is maximum 5 minutes to 1 minute, 30
The values of seconds, 10 seconds, 5 seconds, and 1 second are sequentially stored as hexadecimal data in units of seconds. In the present embodiment, the predetermined value uses the data obtained by dividing the maximum value from 5 minutes to the minimum value of 1 second into 6, but the effect of the present invention does not change regardless of how the maximum value or the division number is set.

Next, the operations of the calculating means 11, the discontinuity detecting means 14, the constant changing means 13 and the input means 15 will be described with reference to FIG. FIG. 6 is a flowchart showing the flow of processing for detecting discontinuities in date / time data.

When the parameter B is 0, the processing by the input means 15 is performed, and when it is 1, the processing by the arithmetic means 11 is performed.
At the time of, the processing of the discontinuity detecting means 14 is performed. The processing of the constant changing means 13 is step 7
It is realized by 07 and step 716. First, branch 701 determines whether parameter B is 0 or not.
When the parameter B is 0, the branch 704 determines whether or not the search mode is set.
The processing from 05 to 708 is executed. In step 705, a search request is output, and in step 706, the date and time data at the start of the search is stored in the memory 0. Step 707
Then 1 for Ts which is the address pointer of the table ROM
Is set, and in step 708, 1 is set in the parameter B.

If parameter B is 1, branch 7
02 to branch 709. In the branch 709, it is determined whether or not a sampling signal has arrived, and when it has arrived, the processing from step 710 onward is executed. In step 710, the date and time data detected from the magnetic tape is stored in the memory 1. In step 711, memory 0
And the data stored in the memory 1 are calculated and stored in the memory 2. Here, the moving amount of the magnetic tape is obtained from the date and time data actually recorded on the magnetic tape.

Next, in the branch 712, the moving amount of the magnetic tape calculated using the FG signal output from the tape drive control means 10, that is, a predetermined value which is the cycle of the sampling signal and the date and time recorded on the magnetic tape. The memory 2 that stores the data difference is compared. As a result, if they are the same, the counter is incremented in step 718 and the process proceeds to the next process. If they are different, it means that the discontinuity point of the date and time data has been passed, so the process proceeds to step 713 to output the inversion request, and the date and time data at the time of the inversion at step 714 is stored in the memory 0. Branch 7
In 15, it is judged whether the counter is 0 or not. When the counter is 0, it means that the difference between the date and time data and the movement amount were not equal in the branch 712, so it means that there is a discontinuity point of the date and time data in the output cycle of the sampling signal. To do. Therefore, in step 717, the parameter B is set to 2 and the process proceeds to the next step.
If the counter is not 0, Ts is incremented and the counter is cleared at step 716, and the above processing is repeated with the parameter B being 1.

When the parameter B is 2, branch 70
The routine proceeds to branch 719 by 3, and it is determined whether Ts is 6 or not. When Ts is 5 or less, the parameter B is set to 1 in step 723, and the process proceeds to the next process. When Ts is 6, the predetermined value is the minimum value of 1 second, which means that there is a discontinuity point within the 1 second interval. So branch 724
Then, it is judged whether or not the difference between the date and time data sent from the data detecting means 4 is larger than 1 second. If the difference is larger, the search mode is canceled and the stop request is output in step 720, and the parameter B is set to 0 in step 722. Then move to the next process. When the difference between the date and time data is 1 second or less in the branch 724, the parameter B remains 2 and the process proceeds to the next step. That is, branches 719 and 724 and step 72
By the processing of 0,723, the position of the discontinuity point can be detected from the 1 second section where the discontinuity point exists, and the magnetic tape can be stopped at that position.

As described above, by detecting the discontinuity of the date and time data by performing the above-described operation, it is possible to surely search even the shortest shooting scene and automatically search the previous video recording scene. You can easily realize the one-scene rewind function.

The data detecting means 4, the calculating means 11, the moving amount detecting means 12, and the discontinuity detecting means 14 of the present embodiment.
The constant changing means 13, the input means 15, and the tape drive control means 16 are realized by software of a microprocessor, but the effect of the present invention is not changed even if the hardware is independent or the software and the hardware are mixed.

FIG. 7 is a block diagram showing the circuit arrangement of an image search operation unit of a magnetic recording / reproducing apparatus (VTR) according to the third embodiment of the present invention. In FIG. 7, the date and time generation means 3
Sends the shooting date and time to the recording and reproducing means 2 as date and time data. The recording / reproducing means 2 records the date and time data together with the video and audio signal on a magnetic tape through a rotary head (not shown), and at the time of reproduction, detects the video and audio signal and the date and time data from the magnetic tape through the rotary head as a reproduction signal. Send to means 4. The data detection means 4 detects date and time data from the reproduction signal and sends it to the calculation means 11 and the discontinuity point detection means 14. Further, the input means 15 is a tape running control means 16 when the user inputs a search start by a key operation.
And a search request is output to the movement amount detection means 12. The moving amount detecting means 12 uses the tape drive control means 16 to detect the magnetic tape
By inputting a signal (hereinafter, abbreviated as FG signal) proportional to the rotation period of the capstan motor that controls the traveling of the magnetic tape 1, the moving amount of the magnetic tape 1 from the time when the search request is input is detected. When it becomes equal to the set predetermined value, the sampling signal is calculated by the calculating means 11 and the discontinuity point detecting means 14.
And output to. The calculating means 11 reads the date and time data from the data detecting means 4 each time the sampling signal is inputted, and when the difference from the date and time data at the time of starting the search is not equal to the moving amount of the magnetic tape 1, the tape drive control means is issued. 16 to the discontinuity detecting means 14 and the constant changing means 13. When the inversion request is input, the constant changing means 13 decreases the predetermined value which determines the output cycle of the sampling signal in the movement amount detecting means 12. The predetermined value is calculated by the calculation means 11
And the discontinuity detecting means 14 use the same value. The discontinuity detecting means 14 inputs the date and time data, the inversion request, the sampling signal and the changed predetermined value, detects the discontinuity and detects the tape drive control means 16 and the image synthesizing means 18.
Output a stop request to. The tape drive control means 16 starts running of the magnetic tape 1 in response to a search request, reverses the running direction of the magnetic tape 1 in response to a reversal request, and stops running of the magnetic tape 1 in response to a stop request. Further, the FG signal is output to the movement amount control means 12. The image memory 17 inputs a reproduction signal, detects a video signal, stores the video signal for one screen while updating it as video data. When a stop command is input from the image synthesizing means 18, the video data storage operation is stopped. The image synthesizing means 18 inputs a stop request, outputs a stop command to the image memory 17, and reduces all the video data stored in the image memory 17 to output it as one screen data capable of multi-screen display. It outputs to 19.

The operation of the magnetic recording / reproducing apparatus of the third embodiment of the present invention thus constructed is shown in FIGS.
It will be described with reference to FIGS. 5 and 6.

The magnetic recording / reproducing apparatus of this embodiment is an apparatus for recording / reproducing a video / audio signal as digital data on a magnetic tape, and a video signal area, an audio signal area and an index area are allocated in one track. In the index area, absolute time information, relative time information such as date and time, and a signal for cueing can be recorded. FIG. 2 is a configuration diagram showing the configuration of date and time data. The date / time data is assigned a capacity of 1 byte for each of the year, month, day, hour, minute, and second, and is recorded / reproduced in the index area on the magnetic tape as 6-byte data in total.

Next, the operation of the movement amount detecting means 12 will be described with reference to FIG. FIG. 5 is a flowchart showing the flow of the operation of the movement amount detecting means 12.

First, the branch 601 determines whether or not it is in the search mode. If it is in the search mode, the process of detecting the movement amount of the magnetic tape is executed. If it is not in the search mode, the next process is performed. In the branch 602, it is determined whether or not the detection request or the inversion request is output, and if it is output, the FG counter is cleared and the process proceeds to the branch 604. The branch 604 detects whether or not the leading edge of the FG signal has arrived, and when it has arrived, the process proceeds to step 605. In step 605, the edges of the incoming FG signal are counted. In step 606, the count value of the FG signal is converted into time data and stored in the memory 3. That is, branch 602 to step 606
With the above processing, the amount of movement of the magnetic tape moved in the search operation is detected every time the FG signal arrives. Next, in branch 607, the memory 3 in which the movement amount is stored is compared with a predetermined value, and if they are equal, a sampling signal is output in step 608 and the FG counter is cleared in step 609. That is, since the sampling signal is output when the movement amount of the magnetic tape reaches a constant value by the processing from the branch 607 to step 609, the output cycle of the sampling signal can be changed by a predetermined value.

Here, the predetermined value will be described using (Table 1). (Table 1) is a table showing the contents of predetermined values stored as table ROM data. Ts is an address pointer for reading a predetermined value from the table ROM, which is changed and set by the constant changing means 7. As the predetermined value, values of maximum 5 minutes to 1 minute, 30 seconds, 10 seconds, 5 seconds and 1 second are sequentially stored as hexadecimal data in units of seconds. In the present embodiment, the predetermined value uses the data obtained by dividing the maximum value from 5 minutes to the minimum value of 1 second into 6, but the effect of the present invention is not changed even if the maximum value and the number of divisions are set.

Next, the operation of the calculating means 11, the discontinuity detecting means 14, the constant changing means 13 and the input means 15 will be described with reference to FIG. FIG. 6 is a flowchart showing the flow of processing for detecting discontinuities in date / time data.

When the parameter B is 0, the processing by the input means 15 is performed, and when it is 1, the processing by the arithmetic means 11 is performed.
At the time of, the processing of the discontinuity detecting means 14 is performed. The processing of the constant changing means 13 is step 7
It is realized by 07 and step 716. First, branch 701 determines whether parameter B is 0 or not. When the parameter B is 0, the branch 704 determines whether or not the search mode is set, and when the search mode is set, the processes of steps 705 to 708 are executed. Step 70
In step 5, the search request is output, and in step 706, the date and time data at the start of the search is stored in the memory 0. Step 7
In 07, Ts which is the address pointer of the table ROM
Is set to 1 and parameter B is set to 1 in step 708.
Is set.

If parameter B is 1, branch 7
02 to branch 709. In the branch 709, it is determined whether or not a sampling signal has arrived, and when it has arrived, the processing from step 710 onward is executed. In step 710, the date and time data detected from the magnetic tape is stored in the memory 1. In step 711, memory 0
And the data stored in the memory 1 are calculated and stored in the memory 2. Here, the moving amount of the magnetic tape is obtained from the date and time data actually recorded on the magnetic tape.

Next, in the branch 712, the moving amount of the magnetic tape calculated using the FG signal output from the tape drive control means 10, that is, the predetermined value which is the cycle of the sampling signal and the date and time recorded on the magnetic tape. The memory 2 that stores the data difference is compared. As a result, if they are the same, the counter is incremented in step 718 and the process proceeds to the next process. If they are different, it means that the discontinuity point of the date and time data has been passed, so the process proceeds to step 713 to output the inversion request, and the date and time data at the time of the inversion at step 714 is stored in the memory 0. Branch 7
In 15, it is judged whether the counter is 0 or not. When the counter is 0, it means that the difference between the date and time data and the movement amount were not equal in the branch 712, so it means that there is a discontinuity point of the date and time data in the output cycle of the sampling signal. To do. Therefore, in step 717, the parameter B is set to 2 and the process proceeds to the next step.
If the counter is not 0, Ts is incremented and the counter is cleared at step 716, and the above processing is repeated with the parameter B being 1.

When the parameter B is 2, branch 70
The routine proceeds to branch 719 by 3, and it is determined whether Ts is 6 or not. When Ts is 5 or less, the parameter B is set to 1 in step 723, and the process proceeds to the next process. When Ts is 6, the predetermined value is the minimum value of 1 second, which means that there is a discontinuity point within the 1 second interval. Therefore, in branch 724, it is judged whether or not the difference between the date and time data sent from the data detecting means 4 is larger than 1 second. If it is larger, in step 720 the search mode is canceled and the stop request is output, and in step 722 the parameters are set. Set B to 0 and move to the next processing. When the difference between the date and time data is 1 second or less in the branch 724, the parameter B remains 2 and the process proceeds to the next step. That is, branches 719 and 724 and step 72
By the processing of 0,723, the position of the discontinuity point can be detected from the 1 second section where the discontinuity point exists, and the magnetic tape can be stopped at that position.

As described above, by detecting the discontinuity of the date and time data by performing the above-described operation, it is possible to surely search even a short shooting scene, and the previous video recording scene is automatically searched. You can easily realize the one-scene rewind function.

The data detecting means 4, the calculating means 11, the moving amount detecting means 12, and the discontinuity detecting means 14 of the present embodiment.
The constant changing means 13, the input means 15, and the tape drive control means 16 are realized by software of a microprocessor, but the effect of the present invention is not changed even if the hardware is independent or the software and the hardware are mixed.

Next, the image memory 17 and the image synthesizing means 18
The operation of will be described. When the image search operation is completed by the above operation, a stop request is output from the discontinuity point detection means 14,
The running of the magnetic tape 1 is stopped by the tape drive control means 16. The image memory stores 30 screens of video data obtained when the magnetic tape 1 is reproduced for about 1 second. When the image synthesizing means 18 inputs a stop request, it outputs a stop command to the image memory 17 and outputs the video data for 30 screens stored in the image memory 17 as a video signal for one screen. By performing such an operation, the images before and after the discontinuity point of the date and time data can be confirmed at the same time, so that the editing work can be performed very easily and accurately.

The image memory 17 of the present invention can store video data for 30 screens, but the effect of the present invention is not affected as long as it has two or more screens.

[0056]

As described above in detail, according to the present invention, when the date and time data is recorded at the time of recording the image signal and the date and time of the image desired to be detected by the user is set as the search data by the input means, the magnetic tape is running. The date and time data is detected by the data detection means, and the comparison means compares the search data with the date and time data, and stops when they match. Therefore, the user can easily and accurately search for a desired video scene at any position on the cassette tape by simply remembering the recorded date and time.

Further, date and time data is recorded at the time of recording the video signal, and when the user inputs a search start, the date and time data at that time is stored and the tape drive control means starts the running of the magnetic tape. On the other hand, when the moving amount of the magnetic tape is detected by the moving amount detecting means and the moving amount reaches a certain value, the date and time data detected by the data detecting means is fetched,
The computing means detects that the difference from the date and time data at the start of the search is not equal to the movement amount. The amount of movement of the magnetic tape is gradually reduced by the constant changing means, and the above detection is repeated. When the amount of movement is minimized by the discontinuity detecting means, the date and time data is read to detect the discontinuity and the magnetic tape running is stopped. That is, since the recorded video scene is searched by searching the discontinuity of the date / time data, the video scene of at least 1 second can be automatically and reliably searched. Therefore, the operability and reliability of the video scene search can be greatly improved.

Further, the image synthesizing means inputs a stop signal to stop the storage operation of the video data in the image memory, compresses the video data stored in the image memory and outputs it as a video signal for one screen. Therefore, when the monitor is connected, the images before and after the seam of the video scenes can be confirmed, so that the operability and reliability of the video scene search can be greatly improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing a circuit configuration of an image search operation control portion of a magnetic recording / reproducing apparatus according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a structure of date and time data in the first embodiment.

FIG. 3 is a flowchart showing an image search operation procedure in the first embodiment.

FIG. 4 is a block diagram showing a circuit configuration of an image search operation control portion of a magnetic recording / reproducing apparatus according to a second embodiment of the present invention.

FIG. 5 is a flowchart showing an operation procedure of a movement amount detecting means in the second embodiment.

FIG. 6 is a flowchart showing an image search operation procedure in the second embodiment.

FIG. 7 is a block diagram showing a circuit configuration of an image search operation control portion of a magnetic recording / reproducing apparatus according to a third embodiment of the present invention.

[Explanation of symbols]

 1 magnetic tape 2 recording / reproducing means 3 date and time generating means 4 data detecting means 5 comparing means 6,15 input means 7,16 tape drive control means 8 video output means 10, 19 video output terminal 11 computing means 12 movement amount detecting means 13 constant Changing means 14 discontinuity detecting means 17 image memory 18 image synthesizing means

Claims (3)

[Claims] 1. A date and time generating means for generating the date and time when a video and audio signal was recorded as date and time data, a recording and reproducing means for recording and reproducing the video and audio signal and the date and time data on a magnetic tape, and the recording and reproducing means. Data detecting means for detecting the date and time data from the reproduction signal reproduced by, and outputting the date and time data detected this time when the date and time data detected this time is different from the date and time data detected this time; An input unit that outputs one or more values as search data and outputs a search request when a search start is requested from the outside, and the date and time data output from the data detection unit and the search data are compared, and they match each other. A comparing means for outputting a stop request at times, and running control of the magnetic tape according to the search request, and stopping running of the magnetic tape according to the stop request. A magnetic recording / reproducing apparatus comprising: a control means; and a video output means for detecting a video signal and a date / time signal from the reproduction signal at a position where the magnetic tape is stopped by the stop signal and outputting the video signal and the date / time signal to an output terminal. . 2. A date and time generating means for generating the date and time when a video and audio signal was recorded as date and time data, a recording and reproducing means for recording and reproducing the video and audio signal and the date and time data on a magnetic tape, and the recording and reproducing means. Data detection means for detecting date and time data from the reproduction signal reproduced by the data output means, output means for outputting the date and time data, input means for transmitting a search request by an external input, and movement of the magnetic tape while the magnetic tape is running. Of the moving amount detecting means for detecting the amount and outputting a sampling signal each time the moving amount reaches a predetermined value, and the date and time data at the time when the magnetic tape starts running and the date and time data at the time when the sampling signal arrives. Arithmetic means for outputting a reversal request when the difference does not match the predetermined value, and constant changing means for decreasing the predetermined value by the reversal request. When it is detected that the output cycle of the inversion request is equal to the output cycle of the sampling signal, if the predetermined value is equal to or less than the threshold value, the date and time data output from the data detecting means becomes discontinuous. A discontinuity point detecting means for detecting that the magnetic tape is stopped and outputting a stop request; starting the running of the magnetic tape in response to the search request; reversing the running direction of the magnetic tape in response to the reversal request; A magnetic recording / reproducing apparatus comprising: a tape drive control means for stopping the running of the tape. 3. A date / time generating means for generating year / month / day / hour / minute / second as date / time data when recording a video / audio signal; a recording / reproducing means for recording / reproducing the video / audio signal and the date / time data on a magnetic tape; Data detecting means for detecting date and time data from the reproduced signal reproduced by the reproducing means and outputting the date and time data when there is a change, input means for transmitting a search request by an external input, and running the magnetic tape. A moving amount detecting means for detecting the moving amount of the magnetic tape and outputting a sampling signal when the moving amount becomes equal to a predetermined value; date and time data at the start of running of the magnetic tape and arrival of the sampling signal. Arithmetic means for outputting a reversal request when the difference from the date and time data does not match the predetermined value; and the predetermined value is decreased by the reversal request. And a constant changing means for controlling, and when the output cycle of the inversion request is detected to be equal to the output cycle of the sampling signal, the date and time data output from the data detecting means if the predetermined value is less than or equal to a threshold value. A discontinuity point detecting means for detecting a discontinuity and outputting a stop request, an image memory for detecting a video signal from the reproduction signal and storing at least two screens while updating the video data, Stop the update of the image memory by the stop request,
An image synthesizing unit for compressing and synthesizing the video data stored in the image memory and outputting it as a video signal for one screen, and running the magnetic tape in response to the search request, and running the magnetic tape in response to the reversal request. Flip the direction,
A magnetic recording / reproducing apparatus comprising: a tape drive control means for stopping the running of the magnetic tape in response to the stop request.