JPH0676550A - Magnetic recording/reproducing device and its program searching and retrieving method - Google Patents

Abstract

PURPOSE:To operate the program searching and retrieving at a high speed by accurately carrying out the program searching by a time code LTC or VITC after the program searching in the vicinity of an editing point is carried out by an address code VASS. CONSTITUTION:A fast fowarding command is sent to a mechanism control microcomputer 16 by an operation microcomputer 14 and a video tape is travelled at a high speed. A tape travelling speed is descriminated by a tape speed discriminating device 13 using a signal from a control head 5 and a switch 11 is changed to an H terminal. When a VASS code in the vicinity of the editing point read by the head 5 is sent to the microcomputer 14 by a VASS reader 17 via time switch 11, a speed searching command is sent to the microcomputer 16 by the microcomputer 14 and the tape speed is switched to a middle speed. Then, the switch 11 is changed to an L terminal by the device 13, the time code LTC read by an audio head 4 is inputted to the microcomputer 14 and when the editing point and input data are made coincident, the travelling of the tape is stopped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus and a cue searching method for the same, and more particularly to a cue searching apparatus and method for editing.

[0002]

2. Description of the Related Art When editing a video tape, it is important to know the editing position of the video tape.
Therefore, in addition to the information signal to be recorded and reproduced,
Recording of video tape position information on a video tape has been conventionally practiced. The position information is Longitudina which is a standardized time code.
l Time Code (hereinafter referred to as “LTC”),
Vertical Interval Time Co
de (hereinafter referred to as “VITC”) is in practical use.

Of these, LTC is a 24-hour address of a digital code recorded in 1CH of an audio track, and is configured to be carried up in 1-frame units.
Since 80 bits are set in the frame and it has a 32-bit binary group (also called user bits) in addition to the time code, it is also used for marking the tape number, material number, broadcast date, recording date, tape content, etc. It is possible.

VITC is a helical scan VTR.
Is a number (address) sequentially assigned to each frame of the television signal in the time code recorded on the video track of NTSC, and is 30 frames per second in the NTSC system. Allocate 29 frames to 01 seconds 00 frames, and in the following order, the second order is 00 to 59 seconds, the minute order is 00 to 59 minutes, and the hour order is 24 hours from 00 to 23:00. Has become.

FIG. 13 is a view showing a tape running system of a VTR. Reference numeral 1 is a rotary drum equipped with a video head, 1a and 1b.
Is a video head that is fixed to the peripheral portion of the rotary drum 1 by slightly protruding, and rotates at high speed together with the rotary drum 1.
Exactly 180 with respect to the center of rotation of each rotating drum
It has been indexed to the ° position. 2a and 2b are loading tape guides, both of which have a function of stably mounting the magnetic tape 3 on the rotary drum 1. Reference numeral 4 is an audio head for recording / reproducing an audio signal, 5 is a control head, and both heads 4 and 5 are integrally formed.

FIG. 14 is a diagram showing a tape pattern according to this system. 6 is an LCH audio track and 7 is an R track.
In the audio track of CH, LTC is recorded / recorded by the audio head 4 in 1CH of this audio track.
Is played. Reference numeral 8 is a normal video track, and V is driven by the video heads 1a and 1b during the vertical synchronization period of the video track 8.
ITC is recorded / reproduced.

FIG. 15 is a block circuit diagram of a conventional cue retrieval device, in which the LTC written in the audio track is picked up by the audio head 4 to obtain the LTC.
Reader / generator (hereinafter referred to as "LTC reader")
The LTC sent to the switch 10 and written up to the frame unit is accurately read and sent to the switch 11 as a code (0, 1).

The VITC written in the vertical synchronization period together with the video signal is picked up by the video heads 1a and 1b, read by the VITC reader / generator (hereinafter referred to as "VITC reader") 12 in frame units, and (0, The code of 1) is sent to the switch 11.

On the other hand, the control signal normally written by the control head 5 is picked up and sent to the tape speed discriminating device 13, and when the tape speed is a medium speed up to about 100 times the standard speed, the tape speed discriminating device 13 outputs H. A signal is issued to the switch 11, the switch 11 is switched to the H terminal side, and the LTC is sent to the operation microcomputer 14. Since LTC is a time code having a voice characteristic, it cannot be reproduced when the video tape is running at low speed or in a stationary state.
It becomes impossible to read LTC. When the tape speed becomes such that the LTC cannot be read, the tape speed determination device 13 issues an L signal, the switch 11 is switched to the L terminal side, and the VITC is sent to the operation microcomputer 14.

When the VITC input to the operation microcomputer 14 at the time of editing becomes the edit point, the operation microcomputer 14 issues a stop command to the mechanical control microcomputer 16 to stop the tape feeding. Even if the stop position is different due to variations in VTR, VI even during slow and still playback
Since the TC can be read, it is possible to perform cueing by slow running until it completely matches.

[0011]

[Problems to be Solved by the Invention] Conventional LTC and V
In the cue control device using the ITC, the cue speed by the LTC is about 100 times the practical range, and since it takes time to switch from the LTC to the VITC, it takes a long time to search for the editing point. There was a problem.

The present invention has been made in order to solve the above problems, and an object thereof is to obtain a magnetic recording / reproducing apparatus and a cue search method for the same, which can perform a cue search at a high speed of about 300 times. And

[0013]

A cue search method for a magnetic recording / reproducing apparatus according to the present invention is a tape speed (hereinafter referred to as "high speed") about 300 times the standard speed of a video tape with respect to a cue target point. ), The tape address code VA recorded on the control track.
SS (VHS Address Search Sys)
tem) code or VISS (VHS Index), which is an index code for finding the beginning of the tape recorded on the control track like the VASS code.
Use the Search System code to locate the video tape near the target point, then run the video tape at a tape speed around 100 times the standard speed (hereinafter referred to as "medium speed"), such as speed search, and use the LTC to set the target point. Or the video tape is run at a tape speed (hereinafter referred to as "low speed") such as standard speed playback or slow speed playback, and the VITC is used to start the playback at the target point.

In addition, the video tape is run at a high speed and V
Use the ASS or VISS code to move to the vicinity of the target point, then run the video tape at medium speed and use the LTC code to move to the vicinity of the target point, and run the video tape at low speed to move to the target point using the VITC code. I tried to cue.

A magnetic recording / reproducing apparatus according to the present invention has a V
ASS or VISS code and LTC or VIT
A means for detecting each C code is provided, the video tape is run at a high speed, the video tape is located near the target point by the VASS or VISS code, then the video tape is run at a medium speed, and the target point is set by the LTC code. Or the video tape was run at a low speed to find the target point by the VITC code.

Also, VASS or VISS code and L
It is equipped with means for detecting TC and VITC codes, runs the video tape at a high speed, locates the video tape near the target point by the VASS or VISS code, and then runs the video tape at a medium speed.
The C code was used to locate the target point very close to it, the video tape was run at a low speed, and the VITC code was used to locate the target point.

[0017]

According to the present invention, the VHS code, which is a cue code for a VHS tape and is an address code that can be found at an absolute address, is used for cueing in the vicinity of the edit point, and then LTC or VITC, Or, since I used LTC and VTC together to perform accurate cueing,
It is possible to perform a cue search at a high speed of about 300 times.

The VISS code, which is a VHS tape cue code, is used to cue near the edit point, and then LTC or VITC, or LTC and VIT.
Since C is used together to perform accurate cueing, a cue search for each program can be performed at a high speed of around 300 times speed.

[0019]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, the same reference numerals as those in FIG. 15 denote the same components, and 17 is a VASS reader / generator (hereinafter referred to as “VASS reader”), which receives the VASS code read by the control head and outputs the data. Output to the H side terminal of the switch 11.

Next, the cue search operation of the first embodiment will be described.
This will be described with reference to the flowchart of FIG. Now, with the edit point command device 15, the edit points are 0H, 00M, 00
S, 10F (zero hour, zero minute, zero second, 10th frame) are set. When the cueing operation starts, in step 1 (hereinafter, displayed as "S1"),
The operation microcomputer 14 issues a fast-forward command to the mechanical control microcomputer 16,
FF or RE the videotape toward the editing point in S2
Set to W mode and run at a speed around 300x.

The tape speed discriminating device 13 discriminates the tape speed from the control signal read by the control head 5, sends out the H signal, and switches the switch 11 to the H terminal side.

The VASS reader 17 reads the VASS code read by the control head 5 and inputs the data into the operation microcomputer 14 via the switch 11. When the VASS code 10 seconds before the editing point is input in S3, the operation microcomputer 14 sends a speed search command to the mechanical control microcomputer 16 in S4 to switch the tape speed to a speed search of about 100 times speed.

Then, the tape speed discriminating device 13 determines S5.
Then, the L signal is sent to switch the switch 11 to the L terminal side, and the LTC data read by the audio head 4 is input to the operation microcomputer 14. The operation microcomputer 14 is
The edit point and the input data are compared, and if they match in S6, a stop command is sent to the mechanical control microcomputer 16 to stop the tape feeding.

According to the first embodiment, the cueing position is ± 0.
Applicable when the accuracy of the frame is not required, it is almost 3
A cue search can be performed at a tape speed of 00 times.

Example 2. 3 is a block circuit diagram of Embodiment 2 of the present invention, and FIG. 4 is a flowchart thereof. In this second embodiment, a VI is used instead of the LTC reader 10 of the first embodiment.
The configuration of the part is the same except that a TC reader / generator (hereinafter referred to as "VITC reader") 12 is used.

Next, the cue search operation of the second embodiment will be described.
This will be described with reference to the flowchart of FIG. The operation from S11 to S13 is the same as the operation from S1 to S3 in the first embodiment. The operation microcomputer 14 sends a reproduction mode command to the mechanical control microcomputer 16 in S14 to switch to the reproduction mode. Then, the tape speed determination device 13 sends an L signal at S15 to switch the switch 11 to the L terminal side,
The data of C is the operation microcomputer 14
Entered in.

Operation microcomputer 14
When the input data is 10 frames before the edit point in S16, the slow play command is sent to the mechanical control microcomputer 16 to switch to the slow play state in S17, and the stop command is sent when the input data becomes the edit point in S18. Stop the tape feeding.

In the second embodiment, the area up to the editing point is 300
Since the search is performed at a double speed, and then the cue is performed with the VITC that can be read by the slow and still reproduction, the cue can be performed with an accuracy of ± 0 frame at a tape speed of approximately 300 times.

Example 3. FIG. 5 is a block circuit diagram of Embodiment 3 of the present invention, and FIG. 6 is a flowchart thereof. Figure 5
1, the same reference numerals as those in FIGS. 1 and 3 respectively denote the same or corresponding portions.
Sends an M signal when the tape speed is slow or still, an L signal when the tape speed is around 100 times speed, and an H signal when the tape speed exceeds 100 times speed, and switches 11 to terminals M, L and H, respectively. Switch to.

Next, the cue search operation of the third embodiment will be described with reference to the flowchart of FIG.

The operation from S21 to S25 switching to LTC is the same as S1 to S5 in FIG.

Next, when the data 10 frames before the editing point is input in S26, the operation microcomputer 14 issues a reproduction mode command in S27 to switch to the reproduction mode, and in S28 the switch 11 is switched to the M terminal. The operation microcomputer 14
VITC data is input to. When the data five frames before the editing point is input in S29, the operation microcomputer 14 issues a slow playback command in S30 to switch to the slow playback mode, and in S31 issues a stop command and feeds the tape. To stop.

In the third embodiment as well, similar to the second embodiment, the cue can be performed with an accuracy of ± 0 frame at a tape speed of approximately 300 times.

Example 4. 7 is a block circuit diagram of Embodiment 4 of the present invention, and FIG. 8 is a flowchart thereof. Figure 7
1, the same reference numerals as those in FIG. 1 denote the same components, and 18 is a VISS reader / generator (hereinafter referred to as “VISS reader”), which is the control head 5.
The VISS signal read in step 3 is output to the H terminal of the switch 11. Reference numeral 19 denotes a frame reset device. When a plurality of programs are recorded on a video tape, the VISS code is written in the control track at the start point (IN point) of the program, and at the same time, the LTC frame code written in the audio track becomes 00F. Like LT
The function is to reset the counter in the C reader 10.

Next, the cue search operation of the fourth embodiment will be described with reference to the flowchart of FIG.

The operation from S41 to S42 is S1 in FIG.
It is the same as the operation from S2 to S2. The operation microcomputer 14 searches for the VISS code indicating the program number designated by the edit point command device 15 in S43, and when the VISS code of the program number designated in S44 is detected, the speed search mode command is sent in S45. , S46 sends a rewinding operation command to rewind the video tape for about 1 second, and then switches to forward speed search in S47. Therefore, the tape speed determination device 13 sends the L signal at S48, and the switch 11
Is switched to the L terminal side, and the LTC data is input to the operation microcomputer 14. When the data specified in S49 is input, the operation microcomputer 14 issues a stop command to stop the tape feeding.

According to the fourth embodiment, it is possible to obtain the effect of cueing at approximately 300 times speed for each recorded program.

Example 5. 9 is a block circuit diagram of Embodiment 5 of the present invention, and FIG. 10 is a flowchart thereof. 9, the same reference numerals as those in FIGS. 3 and 7 denote the same components, and the L terminal of the switch 11 has a VI
The data read by the TC reader 12 is input.

Next, the cue search operation of the fifth embodiment will be described with reference to the flowchart of FIG.

The operation from S51 to S56 is the same as S in FIG.
It is the same as the operation from 41 to S46. The operation microcomputer 14 issues a reproduction mode command in S57 to switch to the reproduction mode. Then, the tape speed determination device 13 sends an L signal in S58, and the switch 11
Is switched to the L terminal side. The operation microcomputer 14 sends a slow playback mode command when the data of 10 frames before the editing point is input in S59, switches to the slow playback mode in S60, and stops command when the editing point data is input in S61. To stop the tape feed.

According to the fifth embodiment, it is possible to obtain the effect of locating at approximately 300 times speed for each recorded program.

Example 6. 11 is a block circuit diagram of Embodiment 6 of the present invention, and FIG. 12 is a flowchart thereof.
11, the same reference numerals as those in FIGS. 5 and 7 and 9 respectively denote the same components, and the tape speed discriminating device 13 outputs H, L and M signals as in the case of the third embodiment shown in FIG. It is sent and the switch 11 is switched.

Next, the operation of this embodiment will be described with reference to the flowchart of FIG.

The operation from S71 to S78 is S4 in FIG.
It is similar to the operation from 1 to S48. Next, S79
6 to S84 operate in the same manner as S26 to S31 in FIG.
In S84, a stop command is issued to stop the tape feeding.

According to the sixth embodiment, it is possible to obtain the effect of locating at approximately 300 times speed for each program.

In each of these embodiments, the tape speed discriminating device 13 is provided to discriminate the tape speed from the reproduced control signal to create the switching code of the switch 11. However, in the operation microcomputer 14, the mechanical control is performed. It may be generated in synchronization with the command to the microcomputer 16.

[0047]

According to the present invention, the standard speed of 3 can be obtained by the VASS code which is an address code or the VISS code which is an index code for cueing.
Run the tape at a high speed of around 00 times to find the beginning of the edit point, and then run the tape at a medium speed of around 100 times speed to run the tape by LTC or at a low speed such as slow playback. Then, since the cue is performed by VITC, a cue search method capable of cueing at a tape speed of about 300 times speed can be obtained.

Further, the tape is run at a high speed of about 300 times the standard speed by the VASS code or the VISS code to find the position near the editing point, and then 10
The tape is run at a medium speed around 0x speed and the LTC is used to cue to the very vicinity of the edit point, and then the tape is run at a low speed such as slow playback and the VITC is used to cue the edit point. So I made about 300
It is possible to obtain a cue search method capable of cueing with an accuracy of ± 0 frame at a tape speed of about double speed.

Further, means for detecting the VASS code,
With the means to detect LTC, the tape is fed at a high speed of around 300 times and the VASS code is used to cue up to the vicinity of the editing point, and then the tape is fed at a medium speed around 100 times the speed of the editing point by LTC. Since it is provided with a means for performing a cue, it is possible to perform a cue search applicable when the cue position accuracy is not required up to ± 0 frame even at a tape speed of about 300 times speed.

Further, means for detecting the VASS code,
A means to detect VITC and tape feeding at a high speed of around 300 times, cue to the vicinity of the editing point by VASS code, then tape feeding at a low speed such as slow playback and edit by VITC Since it is provided with a means for finding a point, a cue search can be performed with an accuracy of ± 0 frame at a tape speed of about 300 times speed.

Also, means for detecting the VASS code,
Means for detecting LTC, means for detecting VITC,
The tape is fed at a high speed of around 300 times and the VASS code is used to find the beginning of the editing point and then 10
Means to perform tape feeding at a medium speed around 0x speed, perform the cue to the very vicinity of the editing point by LTC, and then perform the tape feeding at a low speed such as slow playback and cue the editing point by VITC. Therefore, it is possible to perform a cue search with an accuracy of ± 0 frame at a tape speed of about 300 times speed.

Further, means for detecting the VISS code,
With the means to detect LTC, the tape is fed at a high speed of around 300 times and the VISS code is used to cue up to the vicinity of the editing point, and then the tape is fed at a medium speed of around 100 times the speed of the editing point by LTC. Since it is provided with a means for performing a cue, it is possible to perform a cue search that can be applied when a cue position accuracy of ± 0 frames is not required for each program at a tape speed of approximately 300 times.

Further, means for detecting the VISS code,
A means to detect VITC and tape feeding at a high speed of around 300 times, cue to the vicinity of the editing point by VISS code, then tape feeding at a low speed such as slow playback, and VITC Since it is provided with a means for locating an edit point, it is possible to perform a cue search with an accuracy of ± 0 frame for each program at a tape speed of approximately 300 times speed.

Also, means for detecting the VISS code,
Means for detecting LTC, means for detecting VITC,
The tape is fed at a high speed of about 300 times, and the VISS code is used to cue to the vicinity of the editing point and then 10
Means to perform tape feeding at a medium speed around 0x speed, perform the cue to the very vicinity of the editing point by LTC, and then perform the tape feeding at a low speed such as slow playback and cue the editing point by VITC. Therefore, it is possible to perform a cue search with an accuracy of ± 0 frame for each program at a tape speed of about 300 times speed.

[Brief description of drawings]

FIG. 1 is a block circuit diagram of a first embodiment of the present invention.

FIG. 2 is a flowchart of a first embodiment.

FIG. 3 is a block circuit diagram of a second embodiment of the present invention.

FIG. 4 is a flowchart of a second embodiment.

FIG. 5 is a block circuit diagram of a third embodiment of the present invention.

FIG. 6 is a flowchart of a third embodiment.

FIG. 7 is a block circuit diagram of a fourth embodiment of the present invention.

FIG. 8 is a flowchart of a fourth embodiment.

FIG. 9 is a block circuit diagram of a fifth embodiment of the present invention.

FIG. 10 is a flowchart of a fifth embodiment.

FIG. 11 is a block circuit diagram of a sixth embodiment of the present invention.

FIG. 12 is a flowchart of a sixth embodiment.

FIG. 13 is a plan view showing a tape running system of a VTR.

FIG. 14 is a diagram showing a recording format of a video tape.

FIG. 15 is a block circuit diagram of a conventional cue search device.

[Explanation of symbols]

 1a Video head 1b Video head 4 Audio head 5 Control head 10 LTC reader / generator 11 Switch 12 VITC reader / generator 13 Tape speed discriminating device 14 Operation microcomputer 15 Edit point command device 16 Mechanical control microcomputer 17 VASS reader / generator 18 VISS Reader / generator 19 Frame reset device

Claims (8)

[Claims] 1. An address code (VASS code) recorded on a control track of a video tape or an index code (VISS code) for cueing, by running a video tape at a high speed with respect to a cueing target point.
The video tape to the vicinity of the target point, then run the video tape at a medium speed, and record the time code (LT) recorded on the audio track of the video tape.
Depending on C), the video tape is cued to the target point,
Alternatively, the video tape is run at a low speed, and the time code (VI) recorded on the video track of the video tape is recorded.
A search method for a magnetic recording / reproducing apparatus in which the video tape is searched for at a target point according to TC). 2. An address code (VASS code) recorded on a control track of the video tape or an index code (VISS code) for cueing, by running the video tape at a high speed with respect to a cueing target point.
The video tape to the vicinity of the target point, then run the video tape at a medium speed, and record the time code (LT) recorded on the audio track of the video tape.
By C), the video tape is located very close to the target point, the video tape is run at a low speed, and the video tape is recorded by the time code (VITC) recorded on the video track of the video tape. Cue search method for magnetic recording / reproducing device adapted to cue. 3. A means for detecting an address code (VASS code) recorded on a control track of a video tape, a means for detecting a time code (LTC) recorded on an audio track of a video tape, and the video. A means for selecting the VASS code when the tape running speed is high speed, a means for selecting the LTC code when the tape speed is medium speed, and, at the time of searching for the beginning, first run the video tape at high speed and use the VASS code. A magnetic recording / reproducing apparatus provided with control means for performing cueing up to near a target point, then running a video tape at a medium speed, and cueing with the LTC code. 4. A means for detecting an address code (VASS code) recorded on a control track of a video tape, and a means for detecting a time code (VITC) recorded on a video track of the video tape.
When the running speed of the above video tape is high, the above VA
A means for selecting the SS code and selecting the VITC code when the speed is low, and at the time of searching for the cue, first, the video tape is run at a high speed and the cue to the vicinity of the target point is performed by the VASS code. A magnetic recording / reproducing apparatus provided with a control means for running a video tape at a low speed and performing a cue according to the VITC code. 5. A means for detecting an address code (VASS code) recorded on a control track of a video tape, a means for detecting a time code (LTC) recorded on an audio track of the video tape, and a video tape. Means for detecting the time code (VITC) recorded on the video track of the above, and the VASS code is selected when the running speed of the video tape is high speed, and the LTC code is selected when the running speed is medium speed,
A means for selecting the above-mentioned VITC code at low speed,
When searching for the cue, first run the video tape at a high speed, find the cue near the target point by the VASS code, then run the video tape at a medium speed and reach the very near the target point by the LTC code. Cue, and then run the video tape at a low speed to
A magnetic recording / reproducing apparatus provided with a control means for performing cueing by an ITC code. 6. An index code (VISS code) recorded on a control track of a video tape.
To detect the time code (LTC) recorded on the audio track of the video tape, and to select the VISS code when the running speed of the video tape is high, and to select the VISS code when the running speed is medium. Is above LTC
When selecting the code and searching for the cue, first the video tape is run at a high speed and the VISS code is used to search for a point near the target point, and then the video tape is run at a medium speed and the LTC code is used. A magnetic recording / reproducing apparatus having a control unit for performing a cue. 7. An index code (VISS code) recorded on a control track of a video tape.
To detect the time code (VITC) recorded on the video track of the video tape, and when the running speed of the video tape is high, the VISS code is selected to select a low speed. When the above VIT
A means for selecting a C code, and at the time of searching for a cue, first the video tape is run at a high speed, and the VISS code is used to find the cue near the target point, and then the video tape is run at a low speed and the VITC code is searched. A magnetic recording / reproducing apparatus having a control means for performing cueing by a magnetic recording medium. 8. An index code (VISS code) recorded on a control track of a video tape.
For detecting the time code (LTC) recorded on the audio track of the video tape, a means for detecting the time code (VITC) recorded on the video track of the video tape, and When the running speed of the video tape is high speed, the above VISS code is selected, when it is medium speed, the above LTC code is selected, and when it is low speed, the above VITC code is selected. The video tape is run at a high speed to perform cueing to the vicinity of the target point by the VISS code, and then the video tape is run at a medium speed and the cue to the vicinity of the target point is performed by the LTC code. Further, magnetic recording / reproducing provided with a control means for running the video tape at a low speed to find the head by the VITC code. Location.