JPH0212073B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a television special effects device, and more particularly to a special effects device that produces novel screen switching effects.

Traditionally, special effects for screen switching have included two screens switching horizontally, vertically, or while rotating, but in order to make the screen switch from multiple positions, it is necessary to store data using memory. It was designed to circulate, and the configuration was complicated.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a special effects device that can create a novel multi-wipe effect with a simple configuration.

In the present invention, the television video signal is N
(N=1, 2, 3,...) In the process of sequentially writing data into a memory with a capacity equal to the width of a horizontal scanning period, and reading the written data at a timing that matches the phase of the reading side, writing is usually linear. A multi-wipe effect can be achieved by performing address modification and reading with address modification, which will be described later in the present invention.

Hereinafter, the present invention will be described in detail with reference to the drawings.

In FIG. 1, the main address generator 5 is a period counter that is set to an initial value by being supplied with a clear pulse from the terminal 2 every horizontal period. create. The write address is a straight line as mentioned above, and the necessary phase correction is applied so that the data that reaches the image memory at the time of the horizontal clear pulse is written to the zero address, and is then supplied to the memory system (not shown) from terminal 1. be done. In order to match the horizontal phase of the image data at the image memory input/output terminal, a read-before-or-write operation is required, and the phase-corrected address for this purpose is simultaneously output from the main address generator 5 as the read address. Supplied.

The address shown in FIG. 2 1 is this read address, and the pulse shown in 2 is a horizontal period clear pulse. The register 6 in FIG. 1 is cleared by the above-mentioned clear pulse, and the output data of the adder 7 is latched by the output pulse of the comparator 10, so that the data changes in a stepwise manner as shown by the curve B in FIG. 2. You can get it like this. The amount of step-like change at this time is supplied from the terminal 3 in FIG. 1, and this amount controls the number of multi-screens that appear during multi-wipe. The input data of the register 6 changes as shown in curve A of FIG. 2, and this data is simultaneously sent to the comparator 10 and compared with the read address shown in FIG. A coincidence pulse is generated and supplied to register 6 as a clock pulse. A register like this,
By subtracting the data obtained by the combination of the adder and the comparator from the original read address, the address shown in FIG. 2 is obtained at the output of the subtracter 11. Since this address is an address that repeats between 0 and a certain value, if this data is used as a read address, a portion of the data in the image memory will be read back, resulting in a multi-wipe effect. Furthermore, by superimposing certain offset data on the output value of the subtracter 11, any part of the image memory can be read out cyclically, and the adder 16 and control data input terminal 15 are used for this purpose. It is being A comparator 12 compares the output of the subtracter 11 with external data, and the comparison result is sent to an output terminal 24 via a switch 18.
It is output as a key signal. This waveform is the second
This key signal is shown in FIG. 6, and is used so that the inside of this key signal is output as a valid image. This comparator 1
The two inputs of No. 2 are also applied to the switch 13 at the same time. Since switching control is performed using the output of the comparator 12, the output address is as shown in FIG. 7. Since the subtracter 25 subtracts the amount of slide applied via the terminal 4 from the output of the switch output 13, the output address becomes as shown in FIG. 8.

A split-slide effect can also be created using the previously described embodiments. By adding the output data of the subtracter 25 and the data shown in FIG. 2, 3B in the adder 26, the address shown in FIG. 2 is obtained.

When the data given to control terminal 4 is changed, the second
The time width of the part larger than the zero value of the read address shown in FIG. 7 will be changed, and furthermore,
The address will be changed during the time period shown in the shaded area. This means that in the image memory reading operation, the part of the data that is output as a valid image in each section obtained by dividing the original signal by the split amount applied to terminal 3 is controlled, and the control method The width of the appearing image is controlled by reading the image data from the starting point of each dividing point and sliding the image in the horizontal direction. The effect is to simultaneously slide and split the screen. Data applied to terminal 3 controls the split amount, and data applied to terminal 4 controls the slide amount.

The maximum value of the slide amount in this case is defined within the split amount.

The switch 14 is used to switch the read addresses for generating the various effects described above, and uses the A terminal input to produce a slide effect, the B terminal input to produce a multi-wipe effect, and the C terminal input to produce a split slide effect. can get. Positioning data from the terminal 15 is added to the output of the switch 14 and output as a read address. The maximum value data of the effective image address specified in the memory system is supplied to the terminal 23, and the maximum value data and the read address are compared by the comparator 17, and when the read address is larger, a detection pulse is generated. controlled in a similar manner. This pulse is outputted from the terminal 21 as a key signal via the switch 18.

For a simple image slide effect, the address obtained by adding the position data to the address at the input terminal A of the switch 14 may be read and used as the address.
However, since the actual television signal has a blanking period, it is necessary to control so that the blanking signal does not appear on the screen. Subtractor 19 and switch 20 are used for this purpose. That is, when the read address is within the blanking area in the comparator 17, a detection pulse is generated, and the switching device 20 is controlled by this pulse, but at this time, the blanking width amount is subtracted from the switching device output. The specified address will be output.

Next, FIG. 3 shows this relationship. Figure 1 shows the relationship between the memory read address and time when the image is not moved horizontally, and when the maximum effective image address value M is exceeded, the address shown by the broken line is folded back as shown by the solid line. An address is generated. FIG. 2 shows pulses corresponding to this folding section, which are obtained from the comparator 17 (FIG. 1). By gating the memory read signal using this pulse, unnecessary image signals can be gated. FIG. 3 shows a case where the image is horizontally moved, and the address offset amount a determines the horizontal movement amount, and this data is given from the terminal 15 in FIG. In this case as well, the read address is folded back in the same manner as described above, and the address shown by the solid line is generated.

The pulse shown in FIG. 4 corresponds to this folding section and can be used as an unnecessary image signal gate pulse. If the polarities shown in FIGS. 2 and 4 are used as they are, image movement within the effective image area will be executed in the upper left direction of the raster. This relationship is shown in FIGS. FIG. 6 shows an input image, and FIG. 7 shows an image read out from the memory.The shaded area is gated by the gate pulse shown in FIG. 4, and the image shown in FIG. 5 is obtained. Here, if the gate pulse polarity in FIG. 4 is reversed, an image is obtained in which the shaded portion in FIG. 5 is output and the other portions are gated. At this time, the movement of the image will be executed in the upper right direction of the raster. In FIG. 3, "910" indicates the maximum address of H width, and "M" indicates the maximum address of valid image.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing the output of the main part of FIG. 1, and FIG. 3 is a diagram for explaining the present invention. In the figure, 1... an offset data input terminal that provides the offset amount between the read address and write address given to the image memory with a capacity for one horizontal period, and 2... a clear horizontal period given to the main address generator 5. Pulse input terminal, 3...
Image split amount control data input terminal, 4...Split image slide amount control data input terminal,
5... Main address generator for image memory control, 6
. . . A register that is cleared every horizontal period by the clear pulse and latches the output pulse of the adder 7 with the output pulse of the comparator 10, 7 . . . An adder for the output of the register 6 and the split amount data of 3 above, 8... Image memory write address output terminal, 9... Subtractor for the write address and the offset amount, 10... Comparator for the output of the subtracter 9 and the output of the adder 7, 11... The above A subtracter between the output of register 6 and the output of the subtracter 9, 12...the output of the subtracter 11 and the 4
a comparator for control data of 13, . . . the subtracter 11;
output and control data switch of 4, 14...
A switch for the output of subtracters 9, 11, 13, 15...
Position data input terminal for adjusting the reading position of image memory output data, 16... an adder between the above position data and the output value of the switch, 17... a comparator between the output of the adder 16 and the control data given from the terminal 23 , 18...Switcher between the output of the comparator 17 and the output of the comparator 12, 19...Adder between the output data of the adder 16 and the difference amount, 20...Controlled by the output of the comparator 17 Switcher and adder 19 and 1
6 Output data switch, 21... Difference amount input terminal between the maximum value of the horizontal periodic circulation addresser and the maximum value of the image memory control address, 22... Image memory read address output terminal, 23... Maximum image memory control address Value input terminal, 24...Output terminal of the switch 18, 25...Subtractor for the output of the switch 13 and the control data of 4 above, 26...Adder for the output of the subtracter 25 and the output data of the register 6 .

Claims (1)

[Claims] 1. An address generator comprising: a memory for storing a television video signal for at least one horizontal period; and means for generating write and read addresses for the memory, wherein the address generating means is cleared every horizontal period to generate a write address; , a register that is cleared every horizontal cycle and latches at the timing of a clock pulse, an adder that adds the output of the register and external control data and sends the added output to the register, and an output of the adder and the address generator. and a subtracter that takes the difference between the output of the register and the output of the address generator, and reads the output of the subtracter from the memory. A special effects device characterized by creating a multi-wipe effect by addressing.