JPH01194687A - Consecutive recording device for magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To improve a visual effect for the change of a picture by recording by the fading-out to attenuate a video signal gradually in the part of the completion of a scene A and recording a scene B succeeding to this by a fading-in for every other field during the fading-out period of the scene A. CONSTITUTION:An input signal 20 (hereinafter, signal (b)) is a command signal from a user and a picture recording condition is shown by a high level and a picture recording awaiting condition is shown by a low level. At present, the signal (b) is a high level and the output of a shift register 12 is a high level. A shift register 12 is constituted by an (n) (n is integer) number of T type flip flops, a signal (a) is triggered and the signal 20 is sampled. When an output signal (d) of a shift register 12 is a high level, a capstan control circuit 10 becomes the picture recording condition, a capstan 11 is constantly rotated and a magnetic tape 1 is travelled at a constant speed. Simultaneously, a control signal is generated by a signal 23 and this is recorded through a CTLP detector 18 onto a magnetic tape 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic recording/reproducing apparatus, and more particularly to a splicing apparatus for a magnetic recording/reproducing apparatus suitable for use during one editing or 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 No. 9-18805, it has been common practice to take continuous shots of each scene so that this switching can be done instantaneously. In other words, assuming that a recording track for the video signal for scene A is formed on a magnetic tape, when recording a video signal for scene B on the magnetic tape, the last track for scene A is followed by the track for scene B. K is set so as to form . This continuous shooting method eliminates noise and screen distortion.

Completely different scenes are displayed in an instant.

[Problem to be solved by the invention]

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, and it is not possible to adopt the technique of gradually transitioning from scene A to scene B as seen in theatrical movies. There are problems with the magnetic recording and reproducing devices that are becoming popular, and the addition of such functions is required.

An object of the present invention is to solve this problem by providing magnetic recording that enables recording that gives a visual effect such as a gradual change from scene A to scene B on a video reproduced on one screen. An object of the present invention is to provide a splicing device for a playback device.

[Means to solve the problem]

The above purpose is to record by fade-out that gradually attenuates the video signal at the end of scene A, and then record by fade-in every Kl field during the fade-out period of scene B'& scene A that follows. Scene B
K. The purpose is to obtain a visual effect that gradually changes. Furthermore, a spliced portion is detected using CTL information (for example, VISS), and during playback, a video signal for one field is formed from data for two fields by arithmetic processing.

Achieve more natural connections.

[Effect]

In the spliced portion of scenes A and B on the magnetic tape, the tracks of each scene are recorded alternately, and the video signal of scene A gradually attenuates, while the video signal of scene B gradually returns to the normal level from the attenuated state. , on the playback screen, from scene A to scene B
A display that gradually shifts to .

Furthermore, during playback, the continuous shooting area is detected using CTL information (for example, VISS in the VH8 standard), and one
By obtaining a signal for one field through arithmetic processing and outputting it as a video signal, it is possible to obtain a more natural continuous shot.

〔Example〕

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

FIG. 1 is a block diagram showing an embodiment of a latch photographing device of a magnetic recording/reproducing apparatus according to the present invention.

1 is a magnetic tape, 2.3 is a video head, 4 is a cylinder, 5 and 6 are magnets, 7 is a head position detector, 8 is a head switching signal generator, 9 is a cylinder control circuit, 10 is a capstan control circuit, 11 is a capstan, 12 is a shift register, 13 is a monostable multi-high Y-ray-II,
14ha EXCLUSIVE-OR (hereinafter referred to as EXOR
), 15 is an inverter, 16 is an AND, 17 is a signal processing circuit, 1B is a control signal detector (hereinafter referred to as CTL)
P detector), 20 to 22 are signals.

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 receives a signal 23'f! based on the vertical synchronization signal detected from the signal 21 in the signal processing circuit 17. : As a reference signal for phase control, by the cylinder control circuit 9,
Controlled to always 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 5.6 are provided to represent the positions of the video heads 2.3 and rotate together with the cylinder 4. Then, each time the magnet 2.3 crosses the head position detector 7, a pulse-like voltage is induced in the head position detector 7. From the physical positional relationship between the magnet 5.6 and the head position detector 7, the voltage induction timing by the magnet 6 and the head position detector 7 is determined when the video head 2 is at the upper end of the magnetic tape 1 and when the video head 3 is at the upper 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 position detector 7 is supplied to the head switching signal generator 8, and a rectangular waveform voltage signal a having a cycle of the cylinder 401 rotation period is obtained.

Signal a indicates whether the video head in contact with magnetic tape 1 is video head 2 or 3, and is a head output for converting the output signals from video heads 2 and 3 into one continuous signal. This is a widely known signal that is used for purposes such as selection.

The input signal 20 (hereinafter referred to as signal b) is a command signal from the user, and a high level indicates a recording state, and a low level indicates a recording standby state.The current signal is at a high level, and the output of the shift register 12 is at a high level. do. The shift register 12 is composed of n T-type flip-flops (n is an integer), and uses the signal ak as a trigger to sample the signal 2 (l).

When the output signal d of the shift register 12 is at a high level, the capstan control circuit 10 enters the recording state and the capstan 11? D. The magnetic tape 1 is rotated at a constant speed and runs at a constant speed. At the same time, a control signal is generated from the signal 23 and recorded on the magnetic tape 1 via the CTLP detector 18.

This is because signals C and d are at high level.

The output signal e of EXOR14 is 4 at low level, AND
The output signal f of No. 16 becomes low level. Signal processing circuit 1
7, when the signal d is at a high level and the signal f is at a low level, a signal 21 is recorded on the magnetic tape 1 via the video heads 2 and 3.

As described above, when the signals C and d are at a constant high level, generally known recording is performed.

The case where the signal changes from high level to low level will be described.

Since the shift register 12 samples the signal A with the signal a, the signal C first changes from high level to low level at the rise of signal a, and soon the output signal d of the n-th T-type flip-flop also changes from high level to low level. It changes to.

First, signal C is at low level and signal d is at high level.
explain about.

The signal d is at a high level, and the capstan control circuit 10
remains the same as described above.

The signal e becomes high level, and the inverter 15 inverts the signal a and passes it through the AND 16.

When the signal f is input as a pulse while the signal d is at a high level, the signal processing circuit 17 gradually attenuates the signal level of the portion of the signal 21 that becomes the image on the TV screen every time a rising edge of the signal f is detected. do.

This amount of attenuation is arbitrary. This situation is shown in FIG. In FIG. 3, the vertical axis represents the amount of attenuation of the video signal 21, and the horizontal axis represents time, and the two-time axis glance is 1730 seconds (twice the period of the vertical synchronization signal).

When signal d changes from high level to low level.

The output signal e of the EXOR 14 changes from high level to low level, and the monostable multivibrator 13 starts operating and outputs the signal gY. During the period when the signal g is at the no-y level (arbitrarily set), the capstan control circuit 10 rotates the capstan 11 in the reverse direction to rewind the magnetic tape 1. The amount of rewinding is determined as the amount of overlap with the next recording signal. Become.

When both the signals g and e are at low level, the capstan control circuit 10 enters a recording standby state for the next signal, and the capstan 11 stops.

A case will be described in which the signal goes from low level to high level again and recording starts.

When the signal C changes from a low level to a high level, the signal C changes from a low level to a high level at the rising edge of the signal a, and the signal e becomes a high level.

When the signal d is at the q-level and the signal e is at the high level, the capstan control circuit 10 rotates the capstan In at a constant speed, runs the magnetic tape l, and further converts the control signal detected by the CTLP detector 18 into a signal. Phase control is applied to the capstan 11 so that the phase coincides with 23.

The signal e is input to the AND 16, and the output signal of the inverter 15 is passed therethrough to obtain the signal f.

When the signal f is input as a pulse while the signal d is at a low level, the signal processing circuit 17 gradually returns the signal level of the portion of the signal 21 that becomes the image on the TV screen every time a rising edge of the signal f is detected. . This situation is shown in FIG. This is written in the same manner as in FIG. 3, and shows how the final attenuation amount -XdB gradually returns to OdB at the end of the previous recording.

Further, the signal processing circuit 17 enters a state where the signal d or f is continuously recorded and records the video signal 21' on the magnetic tape 1.

When the signal d becomes high level, the system returns to the above-mentioned initial state and enters the normal recording state.

The state of the signal on the magnetic tape l recorded in the above manner is shown in FIG. 5. In FIG. 5, the vertical axis indicates the level of the recording signal, which is OdB during normal recording.

The horizontal axis indicates the first field, and new video signals are recorded as the field moves from left to right. The white field means the old video signal, and the diagonal line field means the new video signal for the next scene. From FIG. 5, it can be easily understood that the visual effect of gradually transitioning from scene A to scene B can be obtained during playback.

Next, details of the signal processing circuit 17 will be explained using FIG. 6. In Figure 6, 30 is a recording/reproducing circuit, 31 is an attenuator, 32°40
is OR, 33, 37 are field discrimination circuits, 34, 35
38 and 39 are ANDs, 36 is an RS flip-flop, and 41 is an inverter.

Figure 7 is a waveform diagram of the main part of Figure 6! I will also explain @saku.

Video signal 2! is input to the attenuator 31. The attenuator 31 is.

When the signal d is low level and the signal f rises, the video signal 2
1 is attenuated, and when the signal d rises to a high-level cutting signal f, the video signal 21 is changed in the direction of the attenuation amount O dB,
It is output to the recording/reproducing circuit 30.

The recording/reproducing circuit 30 is controlled by the output signal of 0R32.

When the level is high, the output signal of the attenuator 31 is modulated and recorded on the magnetic tape 1 via the video head 2.3.

At low level, magnetic tape 1 to video head 2.3
The reproduced signal is demodulated and output as a video signal 22.

The field discrimination circuit 33 discriminates whether the reproduced signal 22 is an odd field or an even field.

Output as pulse signals i and j. It is assumed that signal i generates a pulse at the start of an odd field and signal j generates a pulse at the start of an even field. It is clear that the determination as to whether it is an odd field or an even field is determined by the vertical synchronization signal 1g and the horizontal synchronization signal in the video signal, and therefore the pulse generation position which is the determination result generally coincides with the vertical synchronization signal. It is easy to get into position.

The changing point of the signal a is generally set at vertical blanking, which is not displayed on the TV screen, and is set 5 to 8 H before the leading edge of the vertical synchronizing signal in the VH8 standard, for example. Therefore, the relationship between the vertical synchronizing signal and signal a is 5 as shown in FIG.

Further, the signal a is phase-locked to the signal 23 as described above, but the phase is normally controlled at 30 flz.

In this description, it is assumed that the phase lock point is within the high level of the signal a. Therefore, the phase of the signal 23 is controlled so that it matches the vertical synchronization signal within the high level of the signal a.

When the signal 22 changes from low level to high level and recording starts, the signal f becomes a pulse and opens until the signal d goes high level.When the signal f is low level, the signal 22 is played back from the magnetic tape 1. The field discrimination circuit 33 discriminates the field of the signal 22. The signal f at the time of starting recording is the inverted signal of the signal a, as described above.

That is, the signal 22 reproduced at this time is the signal on the phase lock point side, and the signal recorded on the 1 phase lock point side is the AN
If a pulse is output from D34, it is an odd field.

If a pulse is output from AND35, it indicates an even field. In FIG. 7, the left half shows the case of an even field, and the right half shows the case of an odd field. AND34
The output of A is connected to the set terminal of the RS flip-flop 36.
The output of ND35 is input to the reset terminal. Therefore, when the reproduced signal 22 on the one phase lock point side is an odd field, the signal is at a high level, and when an even field, the signal is at a low level. When the signal d becomes high level, AND34.35
The output of the RS flip-flop 36 is fixed at a low level, and the output signal of the RS flip-flop 36 holds the state before the signal d becomes high level.

By the way, the field of the signal 21 is discriminated by the field discriminating circuit 37, and the pulse signal 1 indicating an odd field is generated.
．． A pulse signal m indicating an even field is output. When signal k is at high level.

Pulse signal l indicating an odd field passes through AND391, and when signal k is at low level, pulse signal m indicating an even field passes through AND38, 0R40'%:
The signal is outputted from the signal processing circuit 17 as an intermediate signal 23.

The output signals l and m of the field discrimination circuit 37 are as follows.

Similar to the field discrimination circuit 33, it is output to a position that almost coincides with the vertical synchronization signal of the video signal 21, and is output to the cylinder control circuit 9 and capstan control circuit 100 as a phase reference signal 23.
shall meet sufficient specifications.

As a result of the above, the video signal 21 and the reproduced signal 22 from the magnetic tape 1 are controlled so that their respective odd and even fields coincide.

As described above, it is possible to create a recording pattern on the magnetic tape 1 that provides a visual effect of gradually changing from scene A to scene B during playback at the transition from scene A to scene B.

In this embodiment, the video heads 2 and 3 are explained to be in recording mode and playback mode alternately in units of one field, but one head is always in playback mode and the other head is always in recording mode. It is easy to see that it is possible.

Another embodiment will be described using FIG. 8. 8, those having the same functions as those in FIG. 1 are designated by the same reference numerals. Reference numeral 50 in FIG. 8 is an index circuit, which has a cueing function typified by the index system VISS using control signals found in the VH8 standard. 52 is a signal processing circuit.

It is assumed that the signal 51 is at a high level in the recording mode, and the index circuit 50 is in the recording mode.

Every time the index circuit 50 detects a rising edge of the signal C indicating the recording start point, in addition to the control signal generated from the signal 23, the index circuit 50 outputs information indicating the beginning of recording to the CTLP.
The information is recorded on the magnetic tape 1 via the detector 18. Here, in the embodiment described above, the recording control of the control signal was performed by the capstan control circuit 10, and in this embodiment, it was performed by the index circuit 50, but other controls are exactly the same as in the previous embodiment. It is assumed that the video signal 21 is recorded as described above.

Next, the playback mode will be described.

In the regeneration mode, the cylinder control circuit 9 and the capstan control circuit 10 are locked to a phase reference signal generated by an oscillator (not shown).

The cylinder 4 and capstan 11 are constantly rotating.

A control signal detected from the magnetic tape 1 by the CTLP detector 181C is input to the index circuit 50. In the reproduction mode, the signal 51 is at a low level, and the index circuit 50 is in the reproduction mode.

The index circuit 50 detects the recording start point from the control signal and generates a pulse signal n'&. pulse signal n
The signal processing circuit 52 receives the pulse signal n, calculates the reproduced signal from the magnetic tape 1 in units of one field for a certain period of time after inputting the pulse signal n, and outputs it as a video signal 22.

Details of the signal processing circuit 52 will be explained using FIG. 9. −
Components that overlap with the signal processing circuit 52 explained in the embodiment 60 in FIG. Vibrator &63 is a switch.

The switch 63 connects to the A terminal when the signal p is at high level;
When the level is low, the B terminal is selected and output as a video signal 22.

The recording/reproducing circuit 30 connects the magnetic tape 1 to the video head 2,
The signal reproduced by .3 is demodulated by the delay element 60 and the arithmetic unit 61.3. It is output to terminal B of switch 63.

The delay element 60 delays the output signal of the recording/reproducing circuit 30 by one field. The arithmetic unit 61 calculates the output signal of the delay element 60, which is one field before, and the output signal of the recording/reproducing circuit 30, and outputs the terminal AK ratio. The inside of the arithmetic unit 61 is composed of an adder 9, a multiplier, etc., and is a circuit that performs a computation.

Now, when the monostable multivibrator 62 receives the signal n, it remains constant for a predetermined period of time, and the switch 63 selects the terminal AY to output the video signal 22 which is the output signal of the arithmetic unit 61. When the monostable multivibrator output returns from high level to low level, switch 63 selects terminal B and converts the output signal of recording/reproducing circuit 30 into video signal 22.
Output as .

Through the above operations, each time a recording start point is detected from the control signal recorded on the magnetic tape 1, calculation processing is performed on the signal between fields, and when transitioning from scene A to scene B during playback, the visual You can get special effects. It is clear that this embodiment is also effective for continuous shooting patterns (such as one in which scene A is connected to scene B in one or two fields) other than the recording signal explained in the previous embodiment.

〔Effect of the invention〕

As explained above, according to the present invention, there is no need to instantly switch from scene A to scene B. This makes it easier to depict images that were previously difficult for role users.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a splicing device for a magnetic recording/reproducing apparatus according to the present invention, FIG. 2 is a waveform diagram of the main part of FIG. 1, and FIGS. 3 and 4 are shown in FIG. 1. FIG. 5 is a diagram showing the recorded video signal level on the magnetic tape according to the embodiment shown in FIG. 1, and FIG. 6 is a diagram showing the signal processing in FIG. 1. FIG. 7 is a block diagram showing the details of the circuit, FIG. 7 is a waveform diagram of the main part of FIG. 6, FIG. 8 is a block diagram showing another embodiment, and FIG. 9 is a detailed diagram of the signal processing circuit in FIG. 8. FIG. 7...Head position detector. 8...Head switching signal generator. 9...Cylinder control circuit. 10...Capstan control circuit. 12...Shift register, 17.52...Signal processing circuit. 30...recording/reproducing circuit, 31...attenuator. 33, 37...Field discrimination circuit. 50...index circuit. 60...Delay element, 61... Arithmetic unit. 62... Monostable multivibrator. 63...Switch.

Claims (1)

[Claims] 1. In a magnetic recording/reproducing apparatus which records and reproduces video signals by alternately scanning a magnetic tape with two video heads, a
a first means for generating a pulsed voltage signal that alternately repeats a first level and a second level for each field; and a first means for generating a signal indicating a predetermined period immediately after the start of the recording command and immediately after the stop of the recording command. 2, each time the pulsed voltage is input, the video signal to be newly recorded is gradually returned from a predetermined attenuation amount immediately after the start of the recording command to 0 during the period immediately after the stop of the recording command; The output of the third means is recorded by the video head at the first level during the period immediately after the start of recording, and is always recorded during the period immediately after the stop of recording, and the output of the third means is attenuated to A splicing device for a magnetic recording/reproducing device, characterized in that normal recording is performed during a recording period. 2. In the configuration according to claim 1, a fourth step for determining a phase relationship between a vertical synchronizing signal and a horizontal synchronizing signal of a reproduction signal obtained from the magnetic tape by the video head at a second level during a period immediately after the start of recording. and a fifth means for determining the phase relationship between the vertical synchronizing signal and the horizontal synchronizing signal of the video signal, and performing phase control so that the outputs of the fourth means and the fifth means coincide. A splicing device for a magnetic recording and reproducing device, characterized by: 3. In a magnetic recording and reproducing apparatus which records and reproduces video by alternately scanning a magnetic tape with two video heads, a first means for detecting a recording start point and a predetermined period of time after the detection are provided. a third means for delaying the output signal of the video head; and a fourth means for calculating the output signal of the third means and the output signal of the video head; A splicing device for a magnetic recording/reproducing device, comprising a fifth means for selecting the calculation result and the video head output signal based on the output signal of the second means.