JPH0516784Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a special effects device used for editing multiple images in broadcasting stations, studios, etc.

(Prior Art) A special effect device for performing video effects such as increasing or decreasing the area ratio of two types of reproduced images over time on the screen of a television receiver is a
When doing this based on different types of video signals, the effect voltage waveform generated within the device and used as a reference is changed to a fader voltage value that is manually varied by the user in order to vary the area ratio of the two types of reproduced images. Alternatively, it can be compared with a voltage value (ramp wave) that is automatically generated within the device and whose voltage level changes continuously (ramp wave), and the comparison voltage output can be applied to an analog switch in the device to which two types of video signals are applied. This is to obtain a reproduced image with a special video effect by supplying the video signals to the video signals and increasing and decreasing the voltage values of the respective video signals in a complementary manner.

This special video effect occurs during a wipe effect, for example, by scanning a ramp wave from the left side of the screen to the right side, completely replacing (wiping) one playback image with the other playback image, and then continuing. Since the ramp wave is scanned once in the opposite direction (from the right side to the left side of the screen), the screen of the other reproduced image is replaced by the screen of one reproduced image again.

In order to always perform a wipe effect from one side of the screen to the other, every time one scan of the ramp wave is completed, the voltage waveform for the effect whose polarity is reversed is used as a ramp wave returning from the opposite direction. This was done using the voltage obtained by slicing.

Incidentally, a wipe effect is a video effect that complementarily increases or decreases the area ratio of two types of images on the screen over time. For example, from right to left (left to right), from top to bottom (bottom to top) ), the screen gradually transitions to a new image, or a part of the screen gradually becomes larger and a new image appears from there. In extreme cases, it refers to the effect where the screen is completely replaced from one reproduced image to another reproduced image.

(Problem to be Solved by the Invention) When the above-mentioned conventional special effects device performs a wipe effect that always moves from one side of the screen to the other, each time the ramp wave scan is completed, the ramp wave and effect Since it is necessary to invert the voltage waveform and use a voltage obtained by slicing the inverted effect voltage waveform with an inverted ramp wave, a voltage inversion circuit is required to invert the ramp wave and effect voltage waveform, making the circuit configuration complicated. This has the problem of increasing costs, and since the return direction of the ramp wave changes depending on the number of times the wipe effect is performed, good effects cannot be obtained when using a combination of automatic and manual operations. There was a problem.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a special effects device that performs a special effect of increasing or decreasing the area ratio of multiple types of images within the screen. first and second switching circuits that selectively output first and second video signals used for the special effect, respectively; and a control circuit that controls video signal selection of these first and second switching circuits; a ramp wave generation circuit that generates a ramp wave under the control of the control circuit;
An "auto"
a third switching circuit that selects the output of the AND circuit during operation and selects the first signal during "manual"operation; and an effect generation circuit that generates a signal according to the special effect. , a waveform comparator that compares the waveforms of the output of the third switching circuit and the output of the effect generating circuit; and a waveform comparator that is supplied from the first and second switching circuits according to the output from the waveform comparator. The present invention is configured to include an effect means for changing the area ratio of the first and second images within the screen according to the first and second video signals.

(Example) The special effects device according to the present invention has the following configuration. That is, it is a special effect device that performs a special effect of increasing or decreasing the area ratio of multiple types of images within a screen, and selectively outputs first and second video signals (A signal and B signal) used for the special effect. first and second switching circuits 3 and 4;
a control circuit 2 that controls the video signal selection of the switching circuits 3 and 4; a ramp wave generation circuit 9 that generates a ramp wave under the control of the control circuit 2; First signal (D/
"Auto" is controlled by the AND circuit 10 to which the signal from the A converter 13 is supplied and the control circuit 2.
During operation (when switched to "auto" contact 5a), the output of AND circuit 2 is selected, and during "manual" operation (when switched to "manual" contact 5b), the first a third switching circuit 5 that selects a signal, an effect generation circuit 6 that generates a signal according to the special effect, and a waveform comparison that compares the waveforms of the output of the third switching circuit 5 and the output of the effect generation circuit 6. in the screen according to the first and second video signals (A signal and B signal) supplied from the first and second switching circuits 3 and 4 according to the output from the waveform comparator 11 and the output from the waveform comparator 11. This is a special effect device characterized by having an effect means 12 for changing the area ratio of the first and second images.

In particular, when performing a wipe effect, the special effects device of the present invention resets the ramp wave voltage to the scanning start value at the same time as the ramp wave scan is completed, and also resets the two video signals used for the special effect. They are configured to be interchangeable.

In addition, in the following explanation, the screen will always gradually transition to a new image from the right to the left of the screen.
This will be explained using a wipe effect in which the area ratio of two types of images increases or decreases complementary to each other over time, but other wipe effects as mentioned above, such as always moving from left to right and top to bottom (bottom to top) of the screen, will be used to explain. The effect is that the screen gradually changes to a new image, or that a part of the screen gradually becomes larger and a new image appears from there. In extreme cases, it goes without saying that the special effects device of the present invention can also be used to perform a wipe effect where one reproduced image is completely replaced with another reproduced image.

FIG. 1 is a block diagram of an embodiment of the main part of the special effects device according to the present invention, FIG. 2 is a flowchart of the control circuit 2 shown in FIG. 1, and FIG. 3 shows the output waveform of the AND circuit 10. It is a diagram.

The block configuration of the main parts of the special effects device shown in FIG. 1 is as follows: input terminal 1, control circuit 2, program selector 3, movable contact 3A, fixed contacts 3a to
n, preset selector 4, movable contact 4A, fixed contacts 4a to 4n, auto/manual switching circuit 5, movable contact 5A, "auto" contact 5a, "manual" contact 5b, effect generating circuit 6, fader (variable resistor) ) 7, A/D converter 8, ramp wave generation circuit 9, AND circuit 10, waveform comparator 11, effect amplifier 12, D/A converter 13, program display element 14, preset display element 15, output terminal 16 Consisting of

A plurality of video signals for use in special effects are supplied to each of the input terminals 1, from which they are applied to fixed contacts 3a-3n of the program selector 3 and fixed contacts 4a-4n of the preset selector 4.

The control circuit 2 includes a second
The control is performed according to the flowchart shown in the figure. For example, when performing a wipe effect, if the user programs or presets the video signal to be used in advance using a select button (not shown), the control circuit 2 stores this state in the internal memory, and also displays this state in the program display element 14 and preset display element 15. The status is displayed and a program signal or preset signal corresponding to the status is sent out.

The program selector 3 receives a program signal from the control circuit 2 and receives a corresponding video signal (A signal).
Select and output. Further, the preset selector 4 receives a preset signal from the control circuit 2 and selectively outputs a video signal corresponding to the preset signal.

In the illustrated state, program selector 3
The preset selector 4 applies the video signal applied to the fixed contact 3a to one input terminal of the subsequent effect amplifier 12 via the movable contact 3A, and the preset selector 4 applies the video signal applied to the fixed contact 4b to the movable contact 4.
It is supplied to the other input terminal of the effect amplifier 12 via A. The two video signals output from the program selector 3 and preset selector 4 are
It is always supplied to the two input terminals of the effect amplifier 12, and the effect amplifier 12 is connected to the waveform comparator 1.
1 changes the area ratio between the area of the video signal (A signal) from the program selector 3 and the area of the video signal (B signal) from the preset selector 4 within the screen.

Now, the special effects are performed as follows.

Output of ramp wave generation circuit 9 and D/A converter 1
The output of the AND circuit 10 to which the output of 3 is supplied is:
It is applied to the waveform comparator 11 at the next stage. The waveform comparator 11 performs a waveform comparison between the output of the AND circuit 10 and the output of the waveform generation circuit 6. When the effect is to change the area ratio between the area of the A signal and the area of the B signal within the screen, the output of the waveform comparator 11 changes the area ratio of the A signal and the B signal that are supplied to the effect amplifier 12. It is used as a signal for The effect amplifier 12 converts the A signal (B signal) screen to the B signal according to the output voltage level of the waveform comparator 11.
The screen gradually shifts to the signal (A signal) screen, and the entire screen completely shifts to the B signal (A signal) screen.
At this time, the control circuit 2 is supplied with the voltage value from the auto-manual switching circuit 5 which is supplied to the waveform comparator 11, and thereby detects the limit signal voltage value.

Next, the flowchart shown in FIG. 2 performed by the control circuit 2 will be explained step by step.

Step (1): The control circuit 2 is supplied with a limit signal (limit data) from the auto/manual switching circuit 5.

Step (2)...The control circuit 2 detects limit data. If it cannot be detected, the process returns to step (1) above.

Step (3)... Data in a fader value buffer (not shown) in the control circuit 2 is temporarily set to zero. When the control circuit 2 detects the limit data in the state of step (2) above, it sends a signal to the fader value buffer to temporarily set the manual voltage value to zero, sets the value to zero, and returns to the special effect scanning end state. (the "L" state shown in FIG. 3).

Step (4)...Control 2 detects whether the operation selection switch (not shown) has selected "auto" or "manual". "Auto"
The operation is to automatically increase or decrease the area ratio of two types of images, and the "manual" operation is to arbitrarily vary the area ratio of the images using the fader 7. If “Auto” is selected, the step
If you select "Manual", the process will flow to step (5) and step (7).

Step (5)... Return the ramp wave to its original state. Control circuit 2
When it detects that the "auto" operation is selected in the state of step (4) above, it generates a ramp wave and sends a control signal to end the ramp wave scanning and start ramp wave scanning. The signal is sent to circuit 9.

Step (6)...Wait for the ramp wave to enter the scanning start state. When the time T (~) shown in Figure 3 has elapsed, the voltage value of the ramp wave transitions from the "L" state to the "H" state (return end state) (the "H" state shown in Figure 3). .

Step (7)...The data of the fader value buffer in the control circuit 2 is returned to the data value corresponding to the maximum voltage value ("H" state) when the ramp wave is in the scanning start state. This data value is then passed through the control circuit 2 and the D/A converter 13 to the AND circuit 10.
is supplied to one input terminal of A ramp wave is supplied from the ramp wave generation circuit 9 to the other input terminal.

Step (8)...The control circuit 2 exchanges the program signal and preset signal. The control circuit 2 switches between the video signal (A signal) from the program selector 3 and the video signal (B signal) from the preset selector 4, so that the B signal is sent from the program selector 3 and the A signal is sent from the preset selector 4.
The program control signal and preset control signal applied from the control circuit 2 to the program selector 3 are exchanged so that the signal is sent out.

Step (9)...The control circuit 2 outputs the replaced program signal and preset signal.

Step (10)...Until the next limit data is detected, the control circuit 2 uses the signal obtained by subtracting the voltage value supplied from the fader 7 from the maximum voltage value (the "H" state) as the fader manual data. Output to A converter 13.

After this, step (10) returns to "start" and special effects can be obtained by repeating steps (1) to (10) described above.

(Effects of the invention) As mentioned above, the special effects device of the invention does not require reversing the ramp wave and effect voltage waveform every time the ramp wave scan is completed, especially when performing a wipe effect, which is different from the conventional method. This eliminates the need for a voltage inverting circuit that inverts the ramp wave and effect voltage waveform, which has the effect of simplifying the circuit configuration.

Furthermore, since the return direction of the ramp wave does not change depending on the number of times the wipe effect is performed, good special effects can be obtained when the automatic and manual operations are combined.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the main part of the special effects device according to the present invention, FIG. 2 is a flowchart of the control circuit 2 shown in FIG. 1, and FIG. 3 shows the output waveform of the AND circuit 10. It is a diagram. 2... Control circuit, 3... Program selector (first switching circuit), 4... Preset selector (second switching circuit), 5... Auto/manual switching circuit (third switching circuit), 5A ...Movable contact,
5a... "Auto" contact, 5b... "Manual" contact, 6... Effect generation circuit, 9... Ramp wave generation circuit, 10... AND circuit (logical product circuit), 1
1... Waveform comparator, 12... Effect amplifier (effect means), 13... D/A converter, A signal...
First video signal, B signal...second video signal.

Claims (1)

[Scope of utility model registration request] A special effects device that performs a special effect of increasing or decreasing the area ratio of a plurality of types of images within a screen, the first and second switching circuits selectively outputting first and second video signals used for this special effect, respectively. , a control circuit that controls video signal selection of these first and second switching circuits, a ramp wave generation circuit that generates a ramp wave under the control of this control circuit, and an output of this ramp wave generation circuit and the control circuit. An AND circuit is supplied with an output corresponding to a first signal from the circuit, and under the control of the control circuit, the output of the AND circuit is selected during "auto" operation, and the output of the AND circuit is selected during "manual" operation. A third switching circuit that selects the first signal, an effect generation circuit that generates a signal according to the special effect, and a waveform comparison of the output of the third switching circuit and the output of the effect generation circuit. and a waveform comparator that performs a waveform comparator, and a first and second video signal in the screen corresponding to the first and second video signals supplied from the first and second switching circuits in accordance with the output from the waveform comparator. 1. A special effect device comprising: an effect means for changing the area ratio of an image.