JP3314496B2 - Key signal generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a key signal generator for constructing a special effect device for performing a wipe effect and a window opening effect of a video signal.

[0002]

2. Description of the Related Art A method of performing a wipe effect used in a still image file system or the like can be roughly classified into a first method of generating a key signal by gating an output of an up / down / left / right wipe key counter. , As a second method,
By having key planes corresponding to all pixels of an image, a key signal is rewritten for each field by a microprocessor or the like, and a third method is realized by inter-memory transfer (created by the HDTV diffusion support center). See the technical guideline for the display type HDTV still image disk system).

[0003]

The first method, however, has a relatively small circuit size and is widely used for performing a normal wipe effect. However, the wipe method allows a user to freely define a wipe shape. (Program wipe) cannot be realized. The second method has a problem that the rewriting speed cannot keep up if the amount of rewriting data of the key plane per field increases.

In the third method, when reading is continuously performed at high speed from the frame memory for display on the monitor, the transfer position and size must be set in units of fields and transferred one after another. The restrictions are large and the hardware burden is very large,
Since the image data is overwritten, there is a problem that the original image data does not remain in the frame memory after the wipe effect.

The present invention proposes a key signal generating apparatus which solves the above-mentioned drawbacks, thereby performing various wiping effects including program wiping, and at the same time, realizing a window opening effect of an arbitrary shape using the hardware. It is intended to constitute an effect device.

[0006]

According to the present invention, there is provided an address member corresponding to an address for reading an image from a frame memory, and a key signal is activated at a position of the address member after wiping starts. A field member indicating a field value to be set, a size member indicating an active period of the key signal at the position of the address member, the address member to perform an effect of a next field, and information for updating the size member. A wipe key information storage memory comprising means for defining a wipe key information packet composed of incremental members including each line of an image, storing the wipe key information packet for all lines of the image, and reading out the field by field; and the frame memory. Read image from Address value a ₁ and for, wipe compares the address members a ₂ and said field member f ₂ of the Waipuki information packets read sequentially elapsed field value f ₁ from the Waipuki information storage memory since the start, a A comparison means for generating a reference pulse when ₁ = a ₂ , f ₁ ≧ f ₂ ,
Means for generating, as a key signal, a timing pulse having a width based on the size member of the wipe key information packet read from the wipe key information storage memory from the reference pulse, and the wipe key information sequentially read from the wipe key information storage memory Means for performing an operation on the address member and the size member of the packet with the increment member and then writing the result back to the wipe key information storage memory.

[0007]

With the above arrangement, the key signal generator according to the present invention, when performing a wipe effect, stores a series of sets of wipe key information packets for realizing the wipe effect in the wipe key information storage memory before performing the wipe effect. I do.
Here, the order of storage is the order of reading images from the frame memory. Further, by including a plurality of wipe key information packets in one line, a spatially and temporally complicated wipe effect is performed.

At the start of the wipe effect, the wipe key information packet is read from the wipe key information storage memory, and the read address of the frame memory and the field value passed after starting the effect are compared with the address member and the field member of the wipe key information packet. When the above condition is satisfied, a timing pulse for opening a one-line width window having a length (horizontal direction) based on the size member of the wipe key information packet is generated. Update using the indicated address increment, size increment, etc., and write it back to memory.

This operation is performed for all wipe key information packets during one field, and in the subsequent field, the same operation is performed again on the set of wipe key information packets updated in the previous field. As described above, the key signal generation device according to the present invention provides
The initial value of the spatial position where the wipe key is activated,
It is given in the form of address members and size members, the initial value of the temporal position is given in the form of a field member, and in subsequent fields, an incremental member is given as information for updating the value from the above initial value. .
By this series of actions, a program wipe of an arbitrary shape can be realized from a normal wipe, a square wipe, and a divided wipe.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration example of a key signal generator according to the present invention as a first embodiment.

In FIG. 1, reference numeral 10 denotes a wipe key information storage memory for storing a series of wipe key information packets for performing a wipe effect. The data size per address is determined by the number of bits of each member of the wipe key information packet. It is a sum. The address size (memory depth) is the total number of wipe key information packets used,
If a complex program wipe is assumed, it must be larger than the number of required packets.

Reference numeral 12 denotes an address member of the wipe key information packet 20 read from the wipe key information storage memory 10, 14 denotes a field member of the wipe key information packet 20 read from the wipe key information storage memory 10, and 16 denotes a field member of the wipe key information storage memory 10. The size member of the read wipe key information packet 20;
Reference numeral 18 denotes an increment member of the wipe key information packet 20 read from the wipe key information storage memory 10. In this embodiment, the increment member 18 is configured by an address increment and a size increment.

Reference numeral 30 denotes a wipe key information packet 2 read from the wipe key information storage memory 10 in this embodiment.
An operation unit for adding the address increment of the increment member 18 to the address member 12 of 0, and adding the size increment of the increment member 18 to the size member 16 to generate a wipe key information packet 32 of the next field;
Reference numeral 4 denotes a wipe key information packet to be stored in the wipe key information storage memory 10 before the start of the wipe effect.

Reference numeral 40 denotes an address counter for generating an address for reading image data from the frame memory;
2 is an address counter value indicating an address output from the address counter 40, 50 is a field counter indicating a field that has elapsed since the start of the wipe effect,
52 is a field counter value indicating a field output from the field counter 50.

A comparing section 60 compares the address counter value 42 with the address member 12 and the field counter value 52 with the field member 14, and outputs a reference pulse 70 when the values become (Equation 1) and (Equation 2). Is a pulse generator for generating a timing pulse of a time based on the size member 16 of the wipe key information packet 20, that is, a key signal 90.

(Equation 1) Address counter value 42 = Address member 12 (Equation 2) Field counter value 52 ≧ Field member 14 The operation of the key signal generator of the present embodiment configured as described above will be described below. I do. As an example of a configuration of a wipe key information packet for realizing a wipe of 8 pixels / field from left to right (hereinafter abbreviated as right wipe), a set of an initial value (0th field) and a wipe key information packet of the next 1st field Is shown in FIG. In the following embodiments including this embodiment, a high-definition size (1920 × 1035) image is used as an example.

When the wipe key information packet is shown in the figure, the numerical value to be used is expressed in decimal notation, but the numerical value actually stored in the memory is not limited to decimal. In particular, the address is described in the form of (horizontal address, vertical address) in consideration of readability, but the present invention is not limited to this format. Also,
The initial value of the address counter 40 is (0, 0), and the initial value of the field counter 50 is 0.

To execute the right wipe, the initial value of the wipe key information packet for executing the right wipe is written in the wipe key information storage memory 10. At the start of the wipe, the first wipe key information packet 100 is read out, and the comparing unit 60 reads the address member 12 (101), the address counter value 42, and the field member 14 (10
2) and the field counter value 52 are compared. here,
In the read wipe key information packet, (Equation 3)
Is satisfied, successively succeeding wipe key information packets are read out.

(Equation 3) Address counter value 42> Address member 12 or Field counter value 52 <Field member 14 In the case of this wipe key information packet 100, immediately after the start of wiping, (Equation 1) and (Equation 2) are satisfied. As a result, a reference pulse 70 is output. The pulse generation unit 80 generates a timing pulse having a length (8 pixels) corresponding to the value of the size member 16 (103) from the reference pulse 70, as shown in FIG. Wipe key information packet 100
Is calculated by the arithmetic unit 30 in the size member 16 (103).
Is added to the size increment 105 of the increment member 18 to obtain a wipe key information packet 32 (120). Note that if (Expression 3) is satisfied in the read wipe key information packet, the packet is not updated.

The arithmetic operation time from the reading of the wipe key information packet 20 to the generation of the reference pulse 70 by the comparing section 60 is configured to end within the clock time corresponding to one pixel. Processing can also be performed when address members are continuous in units of one pixel. Further, the calculation time after the read wipe key information packet is calculated by the calculation unit 30 and stored in the wipe key information storage memory 10 again may be calculated by reading the packet in the next field. The 30 arithmetic circuits do not need to operate at high speed.

Next, the read wipe key information packet 1
10 is held at the output stage of the wipe key information storage memory 10 until the address counter value 42 = (0, 1). When the address counter value 42 = (0, 1),
Similar to the wipe key information packet 100, the comparison unit 60 generates a reference pulse, and the pulse generation unit 80 generates a timing pulse. This process is repeated in the same manner,
When the processing is completed for 1035 wipe key information packets, the field counter 50 counts up and the next first field starts. The first field is the same as the zeroth field, except that the wipe key information packet is updated as shown in FIG. 2, and the same processing is performed on the subsequent fields to implement a right wipe.

Next, as an example of a configuration of a wipe key information packet for realizing a square opening wipe (hereinafter abbreviated as a square opening wipe) that opens at 8 pixels / field in the horizontal direction and 4 lines / field in the vertical direction from the center (960, 517). FIG. 4 shows a part of a set of the initial value (the 0th field) and the wipe key information packet of the next 1st field.
In this example, only 150 wipe key information packets are valid in the 0th field where the wipe has started,
The address member 151 is added with the address increment 154 of the increment member, and the size member 153 is added with the size increment 155 of the increment member.

In the following first field, wipe key information packets 130, 140,
160, 170 and the updated wipe key information packet 180 become valid, and a desired timing pulse is generated and updated. As described above, when moving in the vertical direction, it can be performed by setting the field member, and when moving in the horizontal direction, it can be performed by increasing the address and size of the increment member.

Next, an example of a wipe key information packet for realizing a square closing wipe (hereinafter abbreviated as a square closing wipe) closing from the periphery to the center (960, 517) with 4 pixels / field in the horizontal direction and 2 lines / field in the vertical direction. FIG. 5 shows a part of the initial values as a configuration example. In this example, 1
In the line, three wipe key information packets (in the case of the first line, for example, wipe key information packets 230, 24
0, 250) realizes a square closing wipe. In this way, by defining a plurality of wipe key information packets for each line, a wipe key of any shape can be generated.

In the present invention, the memory type of the wipe key information storage memory 10 is not particularly limited. For example, if a FIFO (First In First Out) configuration is used, the first-in first-out device can store the wipe key information packet of the present invention. It is convenient for reading method, and FIFO
Is used, it is not necessary to generate an address for reading from the wipe key information storage memory, so that the hardware configuration is simplified. Further, if a normal memory is used as the wipe key information storage memory, random access becomes possible, and it becomes possible to partially rewrite the wipe key information packet from the wipe key information packet. In this regard, the same applies to the following embodiments.

Although the increment member is an address increment and a size increment in the present embodiment, the main purpose of the present invention in the increment member is information for updating another member in the next field. It is also possible to add further different members in order to achieve. For example, in addition to address increment, size increment,
By providing an address secondary increment for increasing the address increment for each field and a size secondary increment for increasing the size increment for each field, the speed of moving the border (horizontal direction) gradually increases for each field. Wipe can be realized. By expanding the incremental member in this manner, various wipe effects can be realized. In this regard, the same applies to the following embodiments.

Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. FIG. 6 is a block diagram showing a configuration example of a key signal generating device according to the present invention as a second embodiment.

In FIG. 6, reference numeral 200 denotes a horizontal speed coefficient value, 210 denotes a vertical speed coefficient value, and 220 denotes a vertical speed coefficient value 210 and a vertical direction for calculating the field member 14 described in the first embodiment. Speed calculator, 230
Is an operation unit that performs an operation on the address member 12 and the size member 16 after performing an operation on the horizontal speed coefficient value 200 and the increment member 18 described in the first embodiment.
Other configurations are the same as in the first embodiment.

The operation of the key signal generator of the present embodiment configured as described above will be described below with respect to differences from the first embodiment in the operation thereof. FIG. 7 shows a part of an initial value of a wipe key information packet for realizing a right-to-left wipe (hereinafter abbreviated as left wipe). When writing back the wipe key information packet 20 read from the wipe key information storage memory 10 to the wipe key information storage memory 10,
The address increment × horizontal velocity coefficient value 200 of the increment member 18 of the wipe key information packet 20 is added to the address member 12, and the size increment × horizontal velocity coefficient value 20
The wipe key information packet 20 is updated to the wipe key information packet 32 by adding 0 to the size member 16. With this feature, by setting the horizontal speed coefficient value to, for example, 1, 2, or 3, the speed at which the border of the wipe moves is 1 pixel / field, 2 pixels / field,
It can be changed to 3 pixels / field.

Next, FIG. 8 shows an example of a configuration of an initial value of a wipe key information packet for realizing a top-to-bottom wipe (hereinafter, abbreviated as a bottom wipe). Vertical speed calculator 22
0, the field member 14 of the wipe key information packet read from the wipe key information storage memory 10
And the quotient divided by the vertical velocity coefficient value 210
Enter 0. With this feature, the speed at which the border of the wipe moves can be changed to 1 line / field, 2 lines / field, and 3 lines / field by setting the vertical speed coefficient value to, for example, 1, 2, or 3.

Thus, by using the key signal generator in this embodiment, it is not necessary to prepare as many sets of wipe key information packets as the number of times when the same shape wipe is performed.

Hereinafter, a third embodiment of the present invention will be described with reference to the drawings. FIG. 9 is a block diagram showing a configuration example of a key signal generating device according to the present invention as a third embodiment.

In FIG. 9, 710 is a wipe key information storage memory, 720 is a part of a wipe key information packet composed of an address member 12, a field member 14, and a size member 16, and 719 is read from the wipe key information storage memory 710. It is a command member of the wipe key information packet. In the present embodiment, the command member is composed of a command number and a command argument.

725 is an address increment value 742 based on the command member 719 and the field counter value 52,
It is a command interpreter that outputs a field increment value 744 and a size increment value 746.

In the embodiment, reference numeral 730 indicates that the address increment value 742 is added to the address member 12 of the wipe key information packet read from the wipe key information storage memory 710, and the field increment value 7 is added to the field member 14.
44 is an arithmetic unit for adding a size increment value 746 to the size member 16 and generating a wipe key information packet 732 for the next field. Other configurations are the same as in the first embodiment.

The key signal generator of the present embodiment configured as described above uses a command member instead of the incremental member described in the first embodiment as a member constituting the wipe key information packet. In the case of a wipe, by assigning a command variation with a required increment member variation in advance, such as assigning an address increment (= 0) size increment (= 8) of the increment member as a command number, for example, 1
The amount of information required by the increment member can be compressed, and the capacity of the wipe key information storage memory can be reduced. This is effective when performing a complicated wipe effect by adding different incremental members as described in the first embodiment.

Further, the command arguments of the command members are used by appropriately using the arguments according to the commands so that the required commands do not become enormous.

Next, as an example of realizing a temporally complicated wipe effect in the horizontal direction by using the field counter value 52 as an input signal in the command interpreter 725 and using the field increment as the increment value,
FIG. 10 shows the initial value of the wipe key information packet, the first field, and the wipe key information packet of the twentieth field. Here, the command number of the command for performing the wipe effect of performing 16 pixels / field from left to right from the start of the effect to the X field from the left to the right, stopping, and then continuing from the Y field again is temporarily set to 2. .

Here, X is the first argument of the command argument, and Y is the second argument. In the 0th field, the read wipe key information packet 750 generates the desired timing pulse and then outputs the desired timing pulse to the command interpreter 72.
The arithmetic unit 730 adds the address increment value (= 0), the field increment value (= 0), and the size increment value (= 16) generated from the command number (= 2) according to No. 5, and becomes a wipe key information packet 760. Here, the command interpreter 725 compares the field counter value 52 with the command argument (in this case, the first argument 20) of the command member 719, and if they match, sets 50 (the second argument of the command argument) as the field increment value. It shall be output. Therefore, in the twentieth field, as shown in the wipe key information packet 770, the number of field members becomes 50, so that a wipe effect of stopping up to 50 fields thereafter can be realized.

Hereinafter, a fourth embodiment of the present invention will be described with reference to the drawings. FIG. 11 is a block diagram showing a configuration example of a key signal generator according to a fourth embodiment of the present invention.

In FIG. 11, reference numeral 310 denotes a window opening key information storage memory for storing a series of window opening key information packets for performing a window opening effect. The data size per address is represented by the window opening key information packet. Is the sum of the number of bits of each member of. The address size (memory depth) is the total number of window opening key information packets to be used, and must be larger than the number of required packets when assuming that a complicated window opening is performed.

Reference numeral 312 denotes a window opening key information storage memory 31.
The address member 316 of the window opening key information packet read from 0 is the size member of the window opening key information packet read from the window opening key information storage memory 310, and 334 is the window opening key information storage before the window opening effect starts. This is a window opening key information packet stored in the memory 310.

Reference numeral 360 denotes a comparator which compares the address counter value 42 with the address member 312 and outputs a reference pulse 70 when (Equation 4) holds.

(Equation 4) Address counter value 42 = Address member 312 The operation of the key signal generator of the present embodiment configured as described above will be described below. Unlike the key signal generator described in the first embodiment, it is not necessary to update the read packet, the same packet is used in all fields, and since there is a window, there is no need to have a packet in every line. Instead, window opening key information packets may be prepared by the number of windows in the line where the window is open. Further, the comparing section 360 does not need to perform the field comparison, and compares only (Equation 4), and generates a timing pulse for opening a one-line width window from the matched address position. With the device in this embodiment, a window opening effect of any shape can be obtained.

Hereinafter, a fifth embodiment of the present invention will be described with reference to the drawings. FIG. 12 is a block diagram showing a configuration example of a key signal generator according to the present invention as a fifth embodiment.

In FIG. 12, reference numeral 400 denotes a signal indicating that window opening is effective, and reference numeral 460 denotes that when the signal 400 indicates that window opening is effective, the reference pulse 70 is generated when (Equation 1) described in the first embodiment is satisfied. When the signal 400 does not indicate that window opening is effective and the formula (1) and the formula (2) hold, as in the case of the comparison unit 60 described in the first embodiment, the comparison unit that outputs the reference pulse 70 is there. If the signal 400 indicates that window opening is valid, the operation 430 is performed on the wipe key information packet 3 without performing the operation on the wipe key information packet 20.
This is an arithmetic unit that outputs as 2.

With the above configuration, the signal 4
As a result, the key signal generator described in the first embodiment can generate the window opening key signal described in the fourth embodiment.

Hereinafter, a sixth embodiment of the present invention will be described with reference to the drawings. As a sixth embodiment, a first embodiment as a configuration example of a key signal generating device according to the present invention will be described.
FIG. 13 is a block diagram showing a configuration of a wipe key information storage memory as a configuration different from the described key signal generation device.

In FIG. 13, reference numeral 510 denotes a first wipe key information storage memory, 511 denotes a second wipe key information storage memory, and 500 denotes a first wipe key information storage memory and a second wipe key information storage memory. 513 is a wipe key information packet 32 (34).
Selector 515 for selecting a memory for writing
Is a second selector for selecting a memory from which the wipe key information packet is read.

With the above configuration, the signal 5
00, while the key signal generator according to the first embodiment is reading the wipe key information packet from the first wipe key information storage memory 510, storing another wipe key information packet in the second wipe key information storage memory 511. By switching the signal 500 and reading the wipe key information packet from another wipe key information storage memory, it is possible to instantaneously switch to a different wipe effect. In this regard, the same applies to the key signal generator described in the second embodiment, the key signal generator described in the third embodiment, the key signal generator described in the fourth embodiment, and the key signal generator described in the fifth embodiment.

Hereinafter, a seventh embodiment of the present invention will be described with reference to the drawings. As a seventh embodiment, as a configuration example of the key signal generation device according to the present invention, the first embodiment
Embodiment 1 is different from the key signal generator described in
FIG. 14 is a block diagram showing the configuration of the address counter 40 described.

In FIG. 14, reference numeral 600 denotes a synchronization signal attached to a video signal, which is a horizontal synchronization signal and a vertical synchronization signal. Reference numeral 640 denotes a counter that counts a reference clock, resets a horizontal address by a horizontal synchronization signal, counts up a vertical address, resets a vertical address by a vertical synchronization signal, and counts up the field counter 50. The counter 642 is an address counter value composed of a horizontal address and a vertical address similar to the address counter value described in the first embodiment.

By configuring the address counter described in the first embodiment as described above, the key signal generator according to the present invention mixes not only the video signal read from the frame memory but also the two video signals accompanied by the synchronization signal. This can be applied to the case where the wipe effect is performed. Regarding this point, the key signal generator described in the second embodiment, the key signal generator described in the third embodiment, the key signal generator described in the fourth embodiment, the key signal generator described in the fifth embodiment, and the key signal generator described in the sixth embodiment are described. The same applies to the key signal generator.

[0054]

As described above, the key signal generator according to the present invention uses a wipe key information packet as information for generating a wipe key signal, and updates the wipe key information packet as needed by simple arithmetic processing of data in the packet. By using the means for performing the operation, it is possible to easily complete the calculation in the time of the field, to realize the wipe effect of any shape with hardware having a simple configuration, and to use the hardware to form a window of any shape. The opening effect can be realized, and the practical effect is very large.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a key signal generating device according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating an initial value of a wipe key information packet for realizing a right wipe and a wipe key information packet of a first field according to the first embodiment;

FIG. 3 is a timing chart of a pulse generator in the first embodiment.

FIG. 4 is a diagram illustrating an initial value of a wipe key information packet for realizing a square opening wipe and a wipe key information packet of a first field according to the first embodiment;

FIG. 5 is a diagram showing an initial value of a wipe key information packet for realizing a square closing wipe in the first embodiment;

FIG. 6 is a block diagram showing a configuration of a key signal generator according to a second embodiment.

FIG. 7 is a diagram showing an initial value of a wipe key information packet for realizing a left wipe in the second embodiment;

FIG. 8 is a diagram showing an initial value of a wipe key information packet for realizing a lower wipe in the second embodiment;

FIG. 9 is a block diagram illustrating a configuration of a key signal generation device according to a third embodiment.

FIG. 10 is a diagram showing a wipe key information packet for realizing a wipe in the third embodiment.

FIG. 11 is a block diagram showing a configuration of a key signal generator according to a fourth embodiment.

FIG. 12 is a block diagram showing a configuration of a key signal generator according to a fifth embodiment.

FIG. 13 is a block diagram showing a part of the configuration of a key signal generator according to a sixth embodiment;

FIG. 14 is a block diagram showing a part of the configuration of a key signal generator according to a seventh embodiment;

[Explanation of symbols]

 Reference Signs List 10 wipe key information storage memory 12 address member 14 field member 16 size member 18 increment member 20 wipe key information packet 30 operation unit 40 address counter 50 field counter 60 comparison unit 80 pulse generation unit 90 key signal

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-2-270480 (JP, A) JP-A-3-254287 (JP, A) JP-A-6-261251 (JP, A) JP-A 64-64 62086 (JP, A) JP-A-3-224370 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G09G 5/00-5/42 G06T 1/60 H04N 5/262- 5/278

Claims (9)

(57) [Claims] When a wipe effect of a video signal is performed by a special effect device having two or more frame memories, an address member corresponding to an address for reading an image from the frame memory, and the address member after a wipe is started. A field member indicating a field value for activating a key signal at a position of a member, a size member indicating an active period of the key signal at a position of the address member, the address member for effecting a next field, and the size A wipe key information packet composed of incremental members including information for updating members is defined for each line of an image, and the wipe key information packet is stored for all lines of the image and read out for each field. Information storage memo An address value a ₁ for reading an image from the frame memory, a field value f ₁ that has elapsed since the start of the wipe, and the address member a ₂ of the wipe key information packet sequentially read from the wipe key information storage memory. Comparing the field member f ₂ , a ₁ =
a _2, a comparing means for generating a reference pulse when having a f ₁ ≧ f ₂ the relationship, as a starting point the reference pulse, the Waipuki information storage width based on the size members of the Waipuki information packets read from the memory Means for generating a timing pulse as a key signal, the address member of the wipe key information packet sequentially read from the wipe key information storage memory, the size member, after performing an operation between the increment member, the A key signal generator comprising means for writing back to a wipe key information storage memory. 2. A means for calculating an address member and a size member, calculating a horizontal speed coefficient value and the increment member, and then calculating the address member and the size member. 2. The key signal generator according to claim 1, wherein the comparison means compares the field member and the vertical velocity coefficient value, and then compares the calculated value with the field member. 3. An address member, a field member,
A wipe key information packet is constituted by a size member and a command member defining a command for performing an operation for each member, and a command of the command member of the wipe key information packet sequentially read from the wipe key information storage memory is defined. Means for interpreting and outputting an increment value corresponding to each of the members, and means for writing back to the wipe key information storage memory after performing an operation between the increment value and each of the members. The key signal generator according to claim 1, wherein 4. A window opening key information packet composed of an address member and a size member is defined for each image line when a window effect of a video signal is performed by a special effect device having two or more frame memories. A window opening key information storage memory comprising means for storing the window opening key information packet and reading it out for each field; an address value for reading an image from the frame memory; and a sequential reading from the window opening key information storage memory. Comparing means for comparing the address members of the window opening key information packet and generating a reference pulse when they match; and the window opening key information packet read from the window opening key information storage memory starting from the reference pulse. Means for generating a timing pulse having a width based on the size member of Key signal generating apparatus characterized by. 5. A means for switching between comparing means and a comparing means in response to a signal S indicating that window opening is effective, and a wipe key information packet is always stored in a wipe key information storage memory when the signal S indicates that window opening is effective. 2. The key signal generating device according to claim 1, further comprising: means for reading the same set. 6. A memory device comprising a plurality of wipe key information storage memories, and means for selecting a memory from which a set of wipe key information packets is read for each field by a signal for selecting the wipe key information storage memory. Item 4. The key signal generator according to any one of Items 1 to 3. 7. A plurality of window opening key information storage memories, and means for selecting a memory from which a set of window opening key information packets is read for each field by a signal for selecting the window opening key information storage memory. 5. The key signal generator according to claim 4, wherein: 8. A memory device comprising a plurality of wipe key information storage memories, and means for selecting a memory from which a set of wipe key information packets is read for each field by a signal for selecting the wipe key information storage memory. Item 6. The key signal generator according to Item 5. 9. The mixed video signals of two systems when performing a wipe effect, a horizontal synchronizing signal of said video signal, a vertical synchronizing signal, an address generating means for generating an address corresponding to the address value a ₁ comprising The key signal generator according to any one of claims 1, 2, 3, 5, 6, and 8.