JPH0535657Y2 - - Google Patents

Description

[Detailed explanation of the idea]

INDUSTRIAL APPLICATION FIELD This invention relates to a video special effects device that can obtain a special wipe pattern that allows a particular image to be inserted into a part of another image or replaced with another image. BACKGROUND TECHNOLOGY AND THEIR PROBLEMS A video special effect device for obtaining a special video effect is installed in a video sub-adjustment console installed in a broadcasting station, and a wipe pattern selection button provided on this device is selected. By operating the fader lever, a predetermined wipe pattern or mix pattern can be obtained. Therefore, this video special effects device includes a plurality of selection buttons that can freely select a plurality of wipes or mix patterns, a feeder lever, and a W/M selection button that selects either a wipe pattern or a mix pattern. is provided. Now, as shown in Figure 2, for example, you can switch from screen S _A to screen S _B , or as shown in Figure 3,
When cutting a part of S _A and inserting screen S _B , conventionally, in the case of Fig. 2, for example, operate the video switching button, and in the case of Fig. 3, use the square wipe of the wipe pattern. After selecting the pattern selection button, the fader lever is operated to obtain a wiped image of the size shown. Therefore, since the buttons to be operated are different between FIG. 2 and FIG. 3, operation is troublesome. This kind of special image can be considered a modification of the wipe pattern, so
In order to solve the above-mentioned drawbacks, it is possible to provide a selection button (FF selection button) for selecting this modified wipe pattern (hereinafter referred to as flip-flop pattern) in addition to the W/M selection button. When a button is selected, a flip-flop pattern can be immediately displayed by operating the feeder lever, further improving operability. However, when providing an FF selection button, it is not only necessary to change the current video special effects device, but also causes problems such as storage space on the operation panel, so it cannot be said to be a very good solution. A flip-flop pattern is a pattern in which a particular selected video signal is wiped and that particular video is inserted into a portion of another image or replaced with that particular image in place of another image. Since this is a pattern, this can be considered a special pattern among wipe patterns. Purpose of the invention Therefore, this invention improves the operability when selecting this special wipe pattern. Summary of the invention Therefore, in the video special effects device according to this invention, a flip-flop selection button, which is a variation of the wipe pattern, is provided among the selection buttons that can select a plurality of wipes or mix patterns. When this happens, the specific video signal selected by operating the fader lever is wiped, and the specific image can be inserted into or replaced with another image. With this configuration, the above-mentioned FF pattern can be obtained extremely easily using only the above-mentioned FF selection button and fader lever. Embodiment Next, an example of the video special effects device according to the invention will be explained in detail with reference to FIG. 1 and FIG. 4 and subsequent figures. Figure 1 shows a video special effects device 10 according to this invention.
In this example, the video switching unit 11 transfers seven different video signals S _A to S _G to three buses BS ₁ to _{BS 3.}
It will be possible to select and distribute the information. In the figure,
The "x" marks are selection switches, and buses BS ₁ to _{BS 3} have seven selection switches (A ₁ to A ₇ ), (B ₁ to _{B 7} ),
(C ₁ to C ₇ ) are provided, and in this example, the selection switch
This is a case where A ₁ , B ₂ , and C ₃ are turned on and video signals S _A to _SC are supplied to the respective buses BS ₁ to BS ₃ . The outputs of the first and second buses BS ₁ , BS ₂ are fed to a first mix swipe circuit 12 , which outputs, together with the output of the third bus BS ₃ obtained via a delay circuit 14 , are applied to the second mix swipe circuit 12 . A mixed or wiped video signal S ₀ is supplied to the circuit 13 and output at its output terminal 15 . Reference numeral 16 denotes a wipe signal generator, and the plurality of types of wipe signals outputted by the wipe signal generator are supplied to the first and second control signal forming circuits 20 and 30, and the respective outputs are sent to the first and second mix wipe circuits 12 and 30, respectively. 13
is supplied to Associated with the control signal forming circuits 20 and 30 are fader levers FL ₁ and FL ₂ (see FIG. 8), respectively. FIG. 4 shows an example of the first control signal forming circuit 20, which includes horizontal and vertical control signal forming means.
It consists of 20H and 20V, and these have the same configuration. To explain the configuration of the horizontal control signal forming means 20H, wipe signals W ₁ to W _o are input to the terminal 21 in order to obtain a plurality of different types of wipe waveforms such as a horizontal wipe and a vertical wipe, and these are input to the selection circuit 22. is supplied to As is well known, the selection circuit 22 is controlled in conjunction with a wipe waveform selection button 41 provided on the console 40 shown in FIG. The terminal 23 is open when the wipe waveform is selected, thereby changing the bias value of the control amplifier 24 at the subsequent stage. Here, the first wipe signal _W1 is used to cut screen S _A and replace it with screen S _B as described above.
This is a wipe signal for obtaining an FF wipe pattern, and the second wipe signal _W2 is a wipe signal for obtaining a wipe screen as shown in FIG. 3B in contrast to screen S _A in FIG. 3A. However, in order to form these screens without going through mix swipe processing, the first and second control signal forming circuits 20 and 30 and the respective fader levers are required.
FL ₁ and FL ₂ are used. At this time, select button 41
FF button is selected. The selected wipe signal is supplied to an inverting/non-inverting control amplifier (buffer amplifier) 24 to generate a control signal.
The inversion and non-inversion states of the wipe signal are controlled based on S _CTL . VR ₁ is a volume for setting the inversion center level when inverting the wipe signal, and _LI indicates the setting level. The output of the control amplifier 24 is fed to a first comparator 25 together with the output associated with the first fader lever FL ₁ . 1st fader lever
A volume VR _F1 is associated with FL ₁ , and its fader output LF ₁ is supplied to the first comparator 25 via a voltage shift circuit 26. The feeder output LF ₁ is further supplied to second and third comparators 27A and 27B forming a window comparator. And the second comparator 27A
The reference level for the output is set by the volume VR ₂ , and in this example, as shown in Figure 5A, it is set to the level LP ₂ , which is slightly lower than the maximum level of the fader output within the variable range L _V of the fader output LF ₁ . be done. The reference level for the third comparator 27B is set by the volume VR ₃ , in this example a level slightly higher than the minimum level fader output.
Set to LP ₃ . Second and third comparator outputs WP ₂ , WP ₃
is supplied to the logic circuit 28 for forming the control output S _CTL , and is a control signal obtained when either of the comparator outputs WP ₂ and WP ₃ is at the “H” level.
The wipe signal is controlled to be inverted by S _CTL , and remains in a non-inverted state at other times. A vertical blanking pulse V.BLK is supplied from a terminal 29 to the logic circuit 28, and an inversion control signal S _CTL is output only at this blanking timing. Therefore, the first fader lever FL ₁
is operated in the middle of the vertical period, so that the second or third comparator output WP ₂ ,
Even if _WP3 becomes "H", the inversion control signal _SCTL is not output until the next vertical blanking period arrives. The first comparator 25 outputs a wipe control signal S _H1 having a horizontal width corresponding to the waveform of the wipe signal from the control amplifier 24 supplied thereto and the level of the first fader output _LF1 . Further, a wipe control signal S _V1 corresponding to the vertical period is also output from the vertical control signal forming means 20V, and the wired-OR output SHV1 of both is supplied to the first mix swipe circuit 12, and in response to this wipe control signal S _H1. The wipe waveform will be displayed. The second control signal forming circuit 30 is similarly configured, and the selected wipe waveform is controlled according to the wipe control signal _SHV2 . Here, wipe control signals SHV ₁ and SHV ₂ are “H”
When , the first mix swipe circuit 12
The video signal supplied to the third bus BS ₂ is selected, and the second mix swipe circuit 13 selects the video signal supplied to the third bus BS ₃ .
It is assumed that the video signal supplied to is selected. Next, the fifth operation for projecting the FF pattern is performed.
This will be explained with reference to the figures below. First, in FIG. 8, M ₁ and W ₁ are _mode selection buttons used when operating the first mix swipe circuit 12;
_W2 is a mode selection button used when operating the second mix swipe circuit 13, and when giving a key signal from the outside, key M, key W
mode selection button is used. To achieve the FF wipe pattern shown in Figure 2 or Figure 3, press wipe mode selection buttons W ₁ and W ₂ .
and FF selection buttons are selected simultaneously. Therefore, in order to realize the FF pattern shown in FIGS. 2A to 2B, the video signal supplied to the third bus BS ₃ is prohibited in the second mix swipe circuit 13. Therefore, the second fader lever FL2 is set at a position where the maximum fader output _LF2 is obtained so that the second wipe control signal _SHV2 becomes "L _" . In the case of the FF wipe pattern shown in Figure 2, the fifth
Wipe signal with a predetermined DC level as shown in Figure A
W ₁ is used. This wipe signal W ₁ has a DC level lower than the minimum reference level LP ₃ by ΔL,
When the first fader lever FL ₁ is operated from the higher side to the lower side, the relationship between the first fader output LF ₁ and the control signal _SCTL becomes as shown in Table 1.

[Table] Therefore, when LF ₁ ≦ LP ₃ , the control signal S _CTL becomes “H”, so the vertical blanking period V・
By the arrival of BLK, this control signal S _CTL
is supplied to the control amplifier 24, at this time the polarity of the wipe signal _W1 is inverted around the inversion level _LI (FIG. 5B). Since the inverted wipe signal _W1 is supplied to the first comparator 25 together with the first fader output _LF1 , the wipe control signal S _H1 becomes "H" for the first time through this inversion process.
The first mix swipe circuit 12 selects the video signal S _B instead of the video signal S _A , and this is supplied to the second mix swipe circuit 13 . Since the second mix swipe circuit 13 has already disabled the video signal S _C , only the video signal S _B is output to the terminal 15 . Therefore, as described above, the screen is replaced from S _A to S _B based on the vertical blanking pulse V·BLK immediately after LF ₁ ≦LP ₃ . In the case of the FF wipe pattern shown in FIG. 3, the selection switch _C1 is turned on so that the video signal S _A can be obtained on the third bus _BS3 , and in this state,
When the second fader lever FL ₂ is operated to obtain the minimum fader output LF ₂ , contrary to the case shown in FIG. 2, the video signal S _A is selected in the third mix swipe circuit 13 and the image S _A It will be projected. In this state, the wipe selection button 41A is selected and the first fader lever FL ₁ is set to the intermediate level. At this time, the triangular wave-like wipe signal _W2 as shown in FIG. 6A is selected, and since the control signal S _CTL is "L", the wipe signal
As a result of supplying W ₂ itself to the first comparator 25, a rectangular waveform wipe control signal S _H1 shown in FIG. 6B is obtained, and the vertical control signal forming means 20V
A similar wipe control signal S _V1 can also be obtained from. Therefore, the first mix swipe circuit 12 outputs a video signal with a wipe _waveform as shown _{in FIG} . In FIG. 6C), the wipe control signal _SHV2 is inverted to select the output of the first mix-swipe circuit 12. As a result, the image is switched from the state shown in FIG. 3A to the state shown in FIG. 3B with the vertical blanking set to low. Note that when the first fader lever FL ₁ is operated in the state shown in FIG. 3B, the magnitude of the wipe waveform changes. A trapezoidal wave signal as shown in FIG. 7 may be used as the wipe signal _W2 . Also, the wipe signal
Various FF wipe waveforms can be realized by selecting W ₁ to W _o . Effects of the invention As explained above, according to this invention, the FF
Just by providing one wipe pattern selection button, you can obtain the desired FF wipe waveform by operating this and the fader lever. Therefore, the operability is further improved than before. In this case, all wipe waveforms can be converted to FF wipe waveforms simply by operating the FF wipe pattern selection button, which greatly simplifies the configuration. Incidentally, in order to realize the same operation as this invention with the conventional device, it is necessary to provide three switches for changing the FF wipe pattern as shown by the broken line in FIG. Furthermore, if the switching to the FF wipe pattern is performed in synchronization with the vertical blanking period as in this embodiment, switching to the FF wipe image in the middle of the vertical scanning period will not occur, and the can prevent image distortion.

[Brief explanation of the drawing]

Fig. 1 is a system diagram showing an example of the video special effects device according to this invention, Figs. 2 and 3 are diagrams for explaining the operation of this invention, and Fig. 4 shows a specific example of the main part of Fig. 1. FIGS. 5 to 7 are waveform diagrams for explaining the operation, and FIG. 8 is a plan view showing an example of the key arrangement on the operation desk. 11 is a video switching unit, 12 and 13 are first and second
16 is a wipe signal generating circuit, 20 and 30 are first and second control signal forming means, and FL ₁ and FL ₂ are fader levers.

Claims (1)

[Claims for Utility Model Registration] A group of switches for selecting a desired wipe pattern and a plurality of types of wipe signals whose levels gradually change are supplied, and correspond to the desired wipe pattern specified by the group of switches. a selection circuit that outputs a wipe signal to be selected; a comparator that compares the level of the wipe signal output from the selection circuit with a signal level corresponding to the position of the fader lever;
a video signal and a second video signal are input, the video signal is provided with a combining circuit that combines the first video signal and the second video signal at a ratio according to the comparison result of the comparator and outputs the result. In the special effects device, a flip-flop selection switch is provided adjacent to the switch group, and a wipe signal having a constant level is inputted to the selection circuit, and when the flip-flop selection switch is operated, the selection circuit controls the wipe signal to maintain the constant level. The selection circuit is configured to output a wipe signal, and when the fader lever is moved from the first position to the second position with the flip-flop selection switch being operated, A video special effects device characterized in that the comparison circuit is configured to output a comparison result signal whose level is inverted in synchronization with a vertical synchronization signal at a predetermined position between the second positions.