JPS62268276A - Device for consecutive image picking-up for magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To make the display gradually shift from a scene A to a scene B in a reproduced picture by re-recording the ending part of the already recorded recording of the scene A with the video signals of the scene B on every other tracks, and forming the tracks of the video signals of the scene B continuously following the ending of the recording area of the scene A. CONSTITUTION:When a picture recording command is issued, in case of consecutive image picking-up, every other ones of the already-formed tracks on a magnetic tape 1 are re-recorded by either video head 2 or 3. Then, a counter 10 counts up output pulses from a NAND gate 12, and when the counting reaches a prescribed value, the video heads 2 and 3 writes video signals consecutively on the magnetic tape 1. Thus, immediately after the command of a recording command, new video signals are intermitently recorded on every other tracks, and this recording is repeated for a duration of several fields. Thereafter, the recording turns to be continuous. As a result, a visual effect of gradual shifting of scenes can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic recording and reproducing apparatus, and particularly to a splicing device for a magnetic recording and reproducing apparatus suitable for use during editing and diving.

[Conventional technology]

Conventionally, in a magnetic recording/reproducing device, when switching and displaying the playback screen from one scene to another, for example,
As disclosed in Japanese Patent Application No. 7-158055, it has been common practice to take continuous shots of each scene so that this switching can be done instantaneously.

That is, as shown in FIG. 4, if a recording track for the video signal for scene AK is formed on a magnetic tape, when recording the video signal for scene B on this track for continuous shooting, the last track for scene A is recorded on the magnetic tape. A scene B track is formed following the track. According to such a continuous shooting method, completely different scenes are instantly switched and displayed without noise or screen disturbance.

[Problem that the invention seeks to solve]

However, according to such conventional technology, it is not possible to adopt the technique of gradually moving from scene A to scene B, as seen in theatrical movies. Certain magnetic recording and reproducing devices have problems, and the addition of such functions is required.

An object of the present invention is to solve such problems, and to provide a magnetic recording system that enables recording that gives a visual effect such as a gradual change from scene person to scene B on the video reproduced on the screen. Our objective is to provide a splicing device for playback devices.

[Failure to solve the problem]

At the end of the area of scene A already recorded on the magnetic tape, every other track of scene A is re-recorded with the video signal of another scene B, and when the recording area of scene A ends, Tracks on which the video signal of scene B is recorded are continuously formed.

[Effect]

Tracks of each scene are alternately formed in the spliced portions of scenes A and B on the magnetic tape, and a gradual transition from scene A to scene B is displayed on the playback screen.

〔Example〕

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

FIG. 1 is a block diagram showing an embodiment of a splicing device for a magnetic recording and reproducing apparatus according to the present invention, in which 1 is a magnetic tape, 2 and 3 are video heads, 4 is a cylinder, 5 and 6 are magnets, and 7 is a head position detector, 8 is a T-type flip-flop (hereinafter referred to as 'I'-FF), 9 is a cylinder control circuit, 10 is a counter, 11.12 is a NARD gate, 13 is a head control circuit, and 14 is a capstan. , 15 is a capstan control circuit, 16 is an inverter, 17 is a D-type flip-flop (hereinafter referred to as D-FF), 18 is an AND gate, and 19 is an input terminal.

FIG. 2 is a waveform diagram showing signals at various parts in FIG. 1, and signals corresponding to those in FIG. 1 are given the same symbols.

Next, the operation of this embodiment will be explained using FIG. 2.

The cylinder 4 is normally operated by the cylinder control circuit 9.
- Controlled to rotate at a constant speed. The video heads 2 and 3 are heads having different azimuth angles, and are installed on the cylinder 4 and rotate together with the cylinder 4. Magnets 5 and 6.

Each of them is provided to represent the position of the video head 2.3 and rotates together with the cylinder 4. Then, each time the magnets 1-2 and 1-3 cross the head position detector 7, a pulse-like voltage is induced in the head position detector 7. From the physical positional relationship between the magnets 5 and 6 and the head position detector 7, the timing of voltage induction by the magnet 6 and the head position detector 7 is determined when the video head 2 is at the top end of the magnetic tape 1 and when the video head 5 is at the top end of the magnetic tape 1. The timing at which the voltage is induced by the magnet 5 and the head position detector 7 represents the timing when the positional relationship between the magnetic tape 1 and the video head 2.3 is opposite to that described above. This pulsed voltage signal from the head detector 7 is supplied to the 'I'-FF 8, and a rectangular waveform voltage signal a having a period of one rotation period of the cylinder 4 is obtained.

4. This voltage signal a is supplied to the T terminal (trigger terminal) K of the D-FF 17, and when the output voltage signal of the inverter 16 is high, it is inverted and passed through the NAND gates 11 and 12. The output voltage signal of the NAND gate 12 is supplied as a clock to the counter 10, and also
When the voltage signal C from the Q terminal of the D-FF 17 is high, the output voltage signal of the gate 11 passes through the AND gate 18 and is supplied to the head control circuit 13 as the voltage signal d. When the output voltage signal of the inverter 16 is low,
The output voltage signals of NAND game) 11 and 12 are fixed at high.

The counter 10 is held in the reset state when the voltage signal from the Q terminal of the D-FF 17 supplied to its R terminal (reset terminal) is...A, and when the voltage signal τ becomes low, the reset state is maintained. It is released and the output pulse of the NARD gate 12 is counted up. Q2 of counter 10
The output is low until its count reaches a certain set value, so the output voltage signal of inverter 16 is no. In this case, voltage signal a is NAN
It inverts and passes through D gates 11 and 12.

The head control circuit 16 performs a recording operation when the voltage signal C from the Q terminal of the I)-FF 17 is high, but in this case, when the voltage signal d from the AND gate 18 is high, the video head 2.3 is set to the recording mode, and 1 to 1. When the voltage signal d is low, the video head 2.3 is set to the playback mode.

The input terminal 19 is connected to the D terminal (data terminal) of D-FF17.
A voltage signal S is supplied from the terminal T, and the voltage signal S is sampled and held every rising edge of the voltage signal a supplied to the T terminal.

Therefore, if the voltage signal is now low, D-FF1
The voltage signal C obtained from the Q terminal of 7 is low. This indicates that the data is not in a recording state. In this case, the head control circuit 1'5 sets the video head 2.3 to another mode. For example, if a reproduction command is issued, the capstan control circuit 15 is set to a different mode by means not shown. The magnetic tape 1 is made to run at a constant speed by rotating the stand 14 at a constant speed, and the head control circuit 16 sets the video heads 2 and 3 in a reproducing state.

In the case of splicing, a portion of the magnetic tape 1 has already been recorded, and the video head 2.3 is positioned a predetermined number of tracks before the last track in this recorded portion. The magnetic tape 1 is stopped.

Therefore, when a recording command is issued, the voltage signal from the input terminal 19 is inverted from low to high, and this causes the D-F
The voltage signal C from the Q terminal of F17 becomes high. Therefore, the capstan control circuit 15 rotates the capstan 14 at a constant speed and causes the magnetic tape 1 to run at a constant speed.

At the same time, the voltage signal τ from the Q terminal of D-FF17
is inverted from a to low, and the counter 10 is released from reset.Moreover, at this time, the Q2 output of the counter 10 is low and the output voltage signal of the inverter 16 is high, so the voltage signal a becomes NAN, It inverts and passes through the D gate 12 and is supplied to the counter 10. Therefore, the counter 10 starts counting up.

Furthermore, since the output voltage signal of the inverter 16 is high, the voltage signal a is inverted and passes through the NAND gate 11, and furthermore, since the voltage signal C from the Q terminal of the D-FF 17 is high, the AND A voltage signal d, which also passes through the gate 18 and has an inverted relation to the voltage signal a, is supplied to the head control circuit 13.

Therefore, the head control circuit 13 puts the video heads 2 and 3 into the recording mode only when the voltage signal d is high, but when the rising and falling edges of the voltage signal a occur, the video heads 2 and 3 are positioned at both ends of the magnetic tape 1. Therefore, during the period when the voltage signal d is high, the video head 2,
Either one of 3 is the period during which the magnetic tape is scanned,
Therefore, only that video head is in the recording state. For this purpose, every other trunk of the already formed tracks on the magnetic tape 1 is placed on the video head 2.
．． Therefore, until the counted value of the counter 10 reaches the predetermined value, two different video signals are alternately recorded on the magnetic tape 1 for each track. become depressed.

The counter 10 counts the output pulses of the NAND gate 12, and when the counted value reaches a predetermined value, its Q2 output becomes high. As a result, the output of the inverter 16 becomes low, and the outputs of the NAND gates 11 and 12 are fixed to high. Therefore, the counter 10 stops counting and the voltage signal d is fixed at high, and thereafter the video head 2.3 continuously writes video signals onto the magnetic tape 1.

FIG. 3 shows a track pattern on the magnetic tape 1 recorded by the above method. In FIG. 3, recording progresses in the direction of the arrow, and fields indicated by body lines are newly recorded tracks. Immediately after a recording command is issued, a new video signal is intermittently recorded every other track, and after this recording state repeats for several fields, it shifts to a state where it is continuously recorded. Here, the number of fields to be recorded intermittently is arbitrary, and the number of bits of the counter 10 and the number of fields recorded intermittently are arbitrary.
It is clear that this can be done by choosing a value at which to stop counting. Also, although I explained it on a field-by-field basis,
It is also clear that the frame unit may be sufficient.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to obtain the visual effect of gradually changing the scene from scene A to scene B without instantly switching, so that it is possible to obtain the visual effect of gradually changing the scene from scene A to scene B. This makes it easier to depict images, which was difficult for general users.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a splicing device for a magnetic recording/reproducing device according to the present invention, FIG. 2 is a waveform diagram showing signals of various parts in FIG. 1, and FIG. FIG. 4 is a diagram showing a track pattern on a magnetic tape according to an embodiment of the present invention. FIG. 1...Magnetic tape, 11° 2.3...Video head 7...Head position detector 10...Counter 12...Head control circuit 19...Kukata terminal for voltage signal based on recording command . , 12. Lotus 1 Figure 2 Lotus Figure 4

Claims (1)

[Claims] In a magnetic recording and reproducing apparatus which records and reproduces video signals by alternately scanning a magnetic tape with two video heads, a first means for generating a pulsed voltage signal phase-synchronized with the rotation of the video head; , a second means for counting the pulsed voltage signal together with the recording command;
The second means has a pulse shape that alternately repeats a first level and a second level in phase synchronization with the pulse voltage signal for a counting period until a preset value is reached. and third means for forming a voltage signal that is fixed at a first level when counting up to the preset value, and for a first level period of the voltage signal from the third means. A splicing device for a magnetic recording/reproducing device, characterized in that the recording mode is: