JPH08221961A - Automatic editing device for magnetic tape - Google Patents

Abstract

PURPOSE: To reduce positional deviation between a start point and an end point of a magnetic tape by converting a count value at the start point and the end point of the magnetic tape to the value from the magnetic tape head when automatic editing is started. CONSTITUTION: Any one among a rewinding button 28c, a reproducing button 28d, a fast-forwarding button 28e is operated, and rewinding, or reproduction, or fast-forwarding is performed, and the magnetic tape 15 is forwarded, and the start point of the part to be copied by the editing is sought. Then, by depressing a start point specification button 29C at the point of time of arriving at the start point, the value of a counter 23 is stored in a nonvolatile memory 24 as the start point. Thus, when no magnetic tape 15 is taken out, even if power source of a reproducing side VTR 1 is turned off, when power source is turned on again, a copy tape with the same contents is formed without performing preparative operation specifying the start point and the end point of the part to be copied by the editing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic magnetic tape editing apparatus which controls an editing operation in a recording / reproducing apparatus using a magnetic tape.

[0002]

2. Description of the Related Art Video tape recorders (hereinafter "VTR")
As an editing device used for the above), an absolute address is written on a magnetic tape like a subcode of an 8 mm video tape recorder, and the capstan is running on the magnetic tape depending on the address or the VTR. Is used to constantly contact the magnetic tape, and is provided with a counter for counting the rotation signal generated according to the rotation of the capstan according to the rotation direction of the capstan. There is one that automatically edits by using the count value at the end point.

[0003]

However, in the former case, the circuit for writing the absolute address on the magnetic tape becomes very large in scale, which is not suitable for a small device such as a camera-integrated VTR. Furthermore, it also leads to cost increase.

In the latter case, when the same editing operation is repeated a plurality of times, the position on the magnetic tape and the count value of the counter are increased each time the number of times of editing increases due to the displacement of the contact between the capstan and the magnetic tape. There is a large gap in the correspondence between.

According to the present invention, there is no need to write an absolute address on a magnetic tape, and moreover, even if the same editing operation is repeated a plurality of times, the positional deviation between the start point and the end point of the magnetic tape does not become large. The purpose is to provide a device.

[0006]

In order to solve the above-mentioned problems, the present invention provides an automatic magnetic tape editing apparatus which responds to a capstan that constantly contacts the magnetic tape while the magnetic tape is running and a rotation of the capstan. Rotation signal generating means, a counter for counting the output pulses from the rotation signal generating means in accordance with the rotation direction of the capstan, and the counter at the start and end points of the magnetic tape reproduced as an editing operation. Storage means for storing at least one set of count values, rewinding means for reversely rotating the capstan at the start of automatic editing to rewind the magnetic tape to the start end, and rewinding the count value stored in the storage means for rewinding. Converting means for converting into a count value from the head of the magnetic tape using the value of the counter at the end of rewinding by the means; And resetting means for resetting after completion the counter rewinding by return means, equipped with a, a reproduction control means for performing cue and playback of the magnetic tape based on the converted count value by the conversion means.

Further, the storage means is composed of a non-volatile memory.

[0008]

When the automatic editing is started, the count values at the start and end points of the magnetic tape are converted into values from the beginning of the magnetic tape.

Further, the converted count value is retained even when the power of the device is turned off.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a functional block diagram showing a reproducing side VTR including an automatic magnetic tape editing apparatus according to an embodiment of the present invention. In the figure, 1 is a reproduction side VTR, 2 is a recording side VT
R and 3 are monitor devices. The video and audio signals reproduced by the reproducing VTR 1 are supplied to the recording VTR 2 and the monitor device 3. Also, the recording side VTR 2 is
As will be described later, it is controlled by a control signal from the reproducing VTR 1.

Next, the inside of the reproducing VTR 1 will be described in detail. 11 is two magnetic heads 12, 12
Is a rotating cylinder that is rotated by a cylinder motor 13. Reference numeral 14 is a cassette that houses a magnetic tape 15, and the magnetic tape 15 is a pull-out guide 16, 16.
Is pulled out from the cassette 14 by the rotary cylinder 11
It is tightly wound around 180 degrees. And the magnetic tape 15
Is sandwiched between a capstan 18 rotated by a capstan motor 17 and a pinch roller 19, and travels in the longitudinal direction. The capstan motor 17 is used for the cassette 1
The reel base (not shown) that engages with the four reels (not shown) is also driven. Further, the capstan 18 and the pinch roller 19 are always in contact with the magnetic tape 15 regardless of the mode of the reproducing side VTR 1 when the magnetic tape 15 is mounted. Further, 20 is a magnetic head 12,
It is a signal processing circuit for processing the reproduction signal from the signal No. 12 and outputting the video signal and the audio signal to the terminal 21.

On the other hand, the capstan motor 17 generates an electric pulse (hereinafter referred to as "FG pulse") according to the rotation. The FG pulse is amplified and waveform-shaped by the FG amplifier 22 and counted by the counter 23.
Since the capstan 18 is always in contact with the magnetic tape 15 while the magnetic tape 15 is running, the count value of the counter 23 indicates the relative position of the magnetic tape 15.
Further, 24 is a counter 2 via the system control circuit 25.
It is a non-volatile memory that stores the value of 3.

The light emitting element 26, the light receiving element 27a,
27b is for detecting the transparent portions provided at the start and end of the magnetic tape 15, and the light receiving element 27a is for detecting the start end.
The light receiving element 27b detects the end.

The system control circuit 25 uses the VT on the reproducing side.
It controls the entire R1, and in the case of the present embodiment, controls the cylinder motor 13, the capstan motor 17, the signal processing circuit 20, the counter 23, the non-volatile memory 24, the light emitting element 26, and the counter 23, the non-volatile memory. The value from 24 is input, and the signals from the light receiving elements 27a and 27b, the VTR operation button group 28, the edit operation button group 29, and the power button 30 are input. Further, a control signal is output to the recording side VTR 2 through the terminal 31. In addition, VTR
The operation button group 28 has a stop button 28a, a pause button 28b, a rewind button 28c, a play button 28d, and a fast-forward button 28e. The edit operation button group 29 has an edit start button 29a, an edit preparation button 29b, and a start point designation. It has a button 29c and an end point designation button 29d.

Next, the operation of this embodiment will be described with reference to FIGS. FIG. 2 is a flowchart showing the operation of the preparation for editing, which specifies the start point and the end point of the portion to be duplicated by the editing, as the preparation for performing the automatic editing, and is started by operating the edition preparation button 29b. First, one of the rewind button 28c, the play button 28d, and the fast forward button 29e is operated to rewind, play, or fast forward the magnetic tape 15, and the starting point of the portion to be duplicated by editing is searched (S1). ). Then, when the start point designation button 29c is pressed when the start point is reached, the value of the counter 23 is set as the start point in the nonvolatile memory 2.
4 (S2, S3). Subsequently, the end point is searched for in the same manner as the start point (S4), and when the end point is reached, the end point designation button 29d is pressed to store the value of the counter 23 in the nonvolatile memory 24 as the end point. (S5, S6). With the above, one set of the start point and the end point is stored, but from step S1 to step S
By repeating steps 6 to 6, a plurality of sets of start points and end points are stored. When the edit preparation button 29b is operated while searching for the start point (S7), 0 is assigned to the variable F (S8), and the edit preparation operation ends. The variable F
Will be described later.

Next, the operation of automatic editing will be described with reference to FIG.
It will be described using the flowchart shown in FIG. Before performing the automatic editing, a recordable magnetic tape is attached to the recording side VTR 2 in advance, and the recording temporary stop state is set.

First, when the edit start button 29a is operated, the magnetic tape 15 is rewound (S11). next,
When the light receiving element 27b detects the light from the light emitting element 26 and the beginning of the magnetic tape 15 is confirmed (S12), it is determined whether the variable F is 0 (S13). And F is 0
If so, the values of the start point and the end point stored in the non-volatile memory 24 are converted into the count value from the head of the magnetic tape 15 by using the value of the counter 23 at the completion of rewinding, and the counter 23 is reset. (S14), 1 is substituted for the variable F (S15). Note that the conversion of the values of the start point and end point of n sets (n is a positive integer) is performed by converting the value of the start point before conversion to P
(N), the value of the end point is Q (n), the value of the counter 23 at the completion of rewinding is T, the value of the converted start point is P '(n), and the value of the end point is Q' (n). Then, the following equation is used.

[0018]

[Equation 1]

Further, 0 is substituted for the variable F at the stage of the above-mentioned editing preparation operation, and 1 is substituted at step S15. Further, if it is determined in step S13 that the value is not 0, the value conversion in step S14 and the reset of the counter 23 are not performed. Therefore, the value conversion and reset are performed only in the first editing operation after the editing preparation operation is performed, and
Do not perform after the first time.

After the values are converted and the counter is reset in step S14, the magnetic tape 15 is stored in the nonvolatile memory 24.
It is fed until the counter value indicating the starting point stored in the counter and the value of the counter 23 match (S16, S17), and when the starting point is reached, the system control circuit 25 first puts the playback VTR 1 into the playback pause state (S18). ). And the terminal 31
A control signal is output through the recording side VTR 2 to release the recording paused state of the recording side VTR 2, recording is started (S19), and reproduction by the reproducing side VTR 1 is started (S20). This recording and reproduction are performed until the counter value indicating the end point stored in the nonvolatile memory 24 and the value of the counter 23 match (S21), and if they match, the system control circuit 25 causes the terminal 3 to operate.
A control signal is output through 1 to bring the recording-side VTR 2 into a recording pause state (S21, S22).

If no other counter value indicating the start point and the end point remains in the non-volatile memory 24, the playback side V
TR1 is stopped (S24), and the editing operation ends. If it remains, the operations from step S16 to step S22 are repeated.

By the operation described above, the VTR1 on the reproducing side is
Of the information recorded on the magnetic tape 15 mounted on the recording side VTR 2, the portion designated by the editing preparation operation is copied to the magnetic tape mounted on the recording side VTR 2. In order to obtain m magnetic tapes (m is a positive integer) of copy tapes having the same contents by the editing operation, recordable magnetic tapes should be attached to the recording VTR 2 and the recording paused state should be set. And Fig. 3
Steps S11 to S24 shown in are only performed m times. Moreover, since the counter values at the start point and the end point of the portion to be copied by editing are stored in the non-volatile memory 24, if the magnetic tape 15 is not taken out, even if the power supply of the reproducing side VTR 1 is turned off, it will be again. When the power is supplied, the copy tape having the same content can be created without performing the preparatory operation of designating the start point and the end point of the portion to be copied by editing.

[0023]

According to the present invention, m lines (m is a positive integer)
When the same program is edited on the above magnetic tape, the deviation of the editing becomes the same as the first editing even after m times, and it is possible to suppress the error to the same minimum error as the first error in the conventional editing. . Also, the counter values at the start point and end point of the portion to be copied by editing are converted to values from the beginning of the magnetic tape and stored in the non-volatile memory, so after turning off the power of the editing device, turn on the power again. Even if the editing operation is performed, the same editing can be performed without performing the preparatory operation of designating the start point and the end point of the portion to be copied by the editing, and the effect is great. .

[Brief description of drawings]

FIG. 1 is a functional block diagram showing an embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the embodiment of the present invention.

FIG. 3 is a flowchart showing the operation of the embodiment of the present invention.

[Explanation of symbols]

 1 Playback-side VTR 2 Recording-side VTR 18 Capstan 22 FG Amplifier 23 Counter 24 Nonvolatile Memory 25 System Control Circuit 26 Light-Emitting Element 27a Light-Receiving Element (For Leading Edge Detection) 29 Editing Operation Button Group

Claims (2)

[Claims] 1. A capstan which is always in contact with the magnetic tape while the magnetic tape is running, a rotation signal generating means which is generated according to the rotation of the capstan, and an output pulse from the rotation signal generating means of the capstan. A counter that counts according to the rotation direction, a storage unit that stores at least one set of count values of the counter at the start point and the end point of a magnetic tape that is reproduced as an editing operation, and the capstan is rotated in the reverse direction at the start of automatic editing. The rewinding means for rewinding the magnetic tape to the start end, and the count value stored in the storage means by using the value of the counter at the end of rewinding by the rewinding means, the count value from the head of the magnetic tape. Converting means for converting into a conversion means, reset means for resetting the counter after rewinding by the rewinding means, and the converting means. An automatic magnetic tape editing apparatus comprising: a reproduction control unit that performs cueing and reproduction of the magnetic tape based on the converted count value. 2. The automatic magnetic tape editing apparatus according to claim 1, wherein the storage means is a non-volatile memory.