JPH0831986B2 - Character / pattern memory playback device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a character / pattern storage device capable of storing an image pattern such as a title character or a graphic, and outputting the image pattern superimposed on another image. is there.

<Prior Art> In recent years, with the spread of home VTRs, the demand for home video cameras has increased, and demands for multifunctional and editing functions of home video cameras have increased.

Among these functions, it is one of the most demanded functions such as imposing for inserting a title and terrorism.

A conventional telop device for inserting a title or the like will be described below with reference to FIG. In FIG.
(1) is a video signal input terminal, (2) is a detection circuit that extracts character / pattern information, (3) is a synchronization separation circuit that separates a synchronization signal from a video signal input, (4) is a serial-parallel conversion circuit, 5) is a parallel-serial conversion circuit,
(6) is a memory, (7) is a reference clock oscillation circuit,
(8) and (9) are vertical counters and horizontal counters that respectively instruct addresses of the memory (6), and (10) is a vertical counter (8) from the sync separation circuit (3) and the oscillation circuit (7),
A frequency dividing circuit for controlling the up-down timing of the horizontal counter (9), (11) a controller, (12) a user command signal such as a switch, and (13) superimposing character / pattern information on another video signal. Character superposition circuit for
(14) is a video signal output terminal.

First, the main flow of the character / pattern signal will be described. The video signal input from the video signal input terminal (1) is converted into a digital signal by the detection circuit (2) at the same time that a synchronization signal is generated by the synchronization separation circuit (3). This digital signal becomes a digital signal of 8 bits or the like by the serial / parallel conversion circuit (4) and is stored in the memory (6). A digital signal of 8 bits or the like, which is information such as characters and patterns stored in the memory (6), becomes a serial digital signal by the parallel-serial conversion circuit (5) and is superimposed on the original video signal by the character superposition circuit (13). Output to the video output terminal (14).

In order to realize the above operation, a reference clock is created by the oscillation circuit (7) of this circuit, and this reference clock is supplied to the serial-parallel conversion circuit (4) and the parallel-serial conversion circuit (5) to convert the conversion timing. give. Also,
This clock is divided by a frequency dividing circuit (10) and then supplied to a horizontal counter (9) which is an addressing counter of a lower bit of the memory (6) to address the memory (6). The carry signal of the horizontal counter (9) is supplied to the vertical counter (8), which is the upper bit addressing counter of the memory (6), to address the memory (6). Further, the controller (11) is designated by a command signal (12) such as a switch to write or read a character / pattern. As a result, the controller (11) has a memory (6), a serial-parallel conversion circuit (4), a parallel-serial conversion circuit (5), a horizontal counter (9), a vertical counter (8), a frequency dividing circuit (10), and an oscillation circuit. (7) is set to the operating or non-operating state. The controller (11) resets the horizontal counter (9) and the vertical counter (8) at the start point of one field with the sync signal supplied by the sync separation circuit (3) as a reference, and patterns and characters on the screen are displayed. Correlation is made between the positions such as and the address of the memory (6). Here, the write operation timing to the memory will be described. For example, in the case of a memory having an 8-bit structure, the result is as shown in FIG. 5, and one bit of the memory, that is, one pixel worth of serial data clock (A).
On the other hand, the address of the memory is changed every 8 pixels. Further, the serial / parallel conversion timing of the data to be written to the memory is performed by the conversion pulse (C), and the writing to the memory is performed during the period displayed on the memory write (D) until the next conversion pulse (C) comes. To do.

<Problems to be Solved by the Invention> The conventional character / pattern storage / reproduction device has been described above. However, in the conventional character / pattern storage / reproduction device, a new character / pattern storage / reproduction device is used without erasing the information previously stored in the memory. The pattern information could not be added and stored in the memory (called add-on) and played back. It is an object of the present invention to provide a character / pattern storage / reproduction device capable of additionally storing (add-on) character / pattern information and reproducing it in a home video camera or the like.

<Means for Solving the Problem> A character / pattern storage / reproduction device according to the present invention forms a character / pattern information by digitizing a first input video signal having a predetermined screen size and input from the outside. Character / pattern information forming means, memory means for storing the character / pattern information formed by the character / pattern information forming means, character / pattern information is read from the memory means, and this is used as a second input video signal. Output video signal forming means for adding and superimposing to form an output video signal, and another character / pattern information having the same screen size and inputted from the outside to the character / pattern information stored in the memory means are added. And re-storing means for re-storing in the memory means.

<Operation> According to the present invention, with the configuration described above, new input information is added and stored (referred to as an add-on) without deleting the character / pattern information currently stored in the memory, and the character・ Can be played as a pattern image.

<Examples of the Invention> Examples of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a character / pattern storage / reproduction device according to the present invention. In FIG.
(1) is a video signal input terminal, (2) is a detection circuit that extracts character / pattern information, (3) is a synchronization separation circuit that separates a synchronization signal from a video signal input, (4) is a serial-parallel conversion circuit, 5) is a parallel-serial conversion circuit,
(6) is a memory, (7) is a reference clock oscillation circuit,
(8) and (9) are vertical counters and horizontal counters for instructing the addresses of the memory (6), (12) is a user command signal such as a switch, and (13) is superimposition of character / pattern information on other video signals. Character superposition circuit for, (14)
Is a video output terminal, (11) is a command signal (12) and the sync signal from the sync separation circuit (3) is input, and the count and reset timings of the vertical counter (8) and horizontal counter (9) and the memory (6 ) Is a controller for controlling reading and writing, and (15) is an AND circuit (16) for enabling a signal read from the memory by an addition gate and an AND circuit (16).
It is composed of an OR circuit (17) for adding a signal from the circuit (16) and an input signal from the serial / parallel conversion circuit (4). (18) is an add-on command signal.

In FIG. 1, the signal of the video signal input terminal (1) is stored in the memory (6) under the control of the controller (11) by the command signal (12), and is read out from the memory (6) at the time of another video input signal. The operation of adding in the character superimposing circuit (13) and outputting from the video signal output terminal (14) is the same as the conventional example.

Now, with the same memory as before, the enable signal (a) from the controller (11) without the add-on signal (18)
Becomes "L", and all outputs of the AND circuit become "L". Therefore, the output of the OR circuit (16) becomes the same signal as the output of the serial / parallel conversion circuit (4) and is stored in the memory (6), and the same operation as that of the conventional character / pattern superposing device is performed. Next, when in add-on mode, add-on signal (18)
Is present, the enable signal (a) from the controller (11) becomes "H". As an example, the case of 8 bits will be explained with reference to FIG. 2. The period from the output of the serial / parallel conversion pulse of the write data to the memory (6) to the output of the next serial / parallel conversion pulse is read from the memory. As in / write (D), the first half of one cycle is read and the contents of the memory (6) at the address to be written are read, latched by the read data latch pulse (E), and the 8-bit OR circuit (17) The data converted by the serial / parallel conversion pulse is added, and the latter half of one cycle is written as a write and written in the memory (6). The logic at this time is as follows, for example.

When the writing to the memory (6) is performed as described above, the input information (n) of this time is added and stored to the information (m) stored up to the previous time as shown in FIG. Information (1) is obtained, and finally it is added and superposed with another video input to become a reproduction output (K). If the addition gate (15) satisfies the above [logical table], the AND circuit (1
6), needless to say, it is not limited to the configuration of the OR circuit (17).

<Effect of the Invention> As described above, according to the character / pattern storage / reproduction device of the present invention, the character / pattern information is obtained by digitizing the first input video signal having a predetermined screen size and input from the outside. Character / pattern information forming means for forming
Characters formed by the character / pattern information forming means
Memory means for storing pattern information; output video signal forming means for reading character / pattern information from the memory means and adding and superposing this on the second input video signal to form an output video signal; Since the stored character / pattern information is provided with a re-storing means for adding another character / pattern information having the same screen size as that of this and input from the outside and storing again in the memory means, New character / pattern information can be added and stored and played back without erasing the information stored in.

[Brief description of drawings]

FIGS. 1, 2 and 3 are diagrams showing an embodiment of the present invention. FIG. 1 is a block diagram showing the configuration, FIG. 2 is a memory storage timing diagram, and FIG. 3 is an operation example screen diagram. Is. Fourth
5 and 5 are diagrams showing a conventional example, FIG. 4 is a block diagram showing the configuration, and FIG. 5 is a memory storage timing diagram. 2: Detection circuit, 4: Serial-parallel conversion circuit, 5: Parallel-serial conversion circuit, 6: Memory, 11: Controller, 13: Character superposition circuit, 15: Addition gate, 16: AND circuit, 17: OR circuit,
18: Add-on signal In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A character / pattern information forming means for digitizing a first input video signal having a predetermined screen size and inputted from the outside to form character / pattern information, and the character / pattern information forming means. Formed characters
Memory means for storing pattern information; output video signal forming means for reading out character / pattern information from the memory means and adding and superposing this on the second input video signal to form an output video signal; Another character that has the same screen size as the stored character / pattern information and is input from the outside
A character / pattern storing / reproducing apparatus comprising: a re-storing unit that adds pattern information and stores it again in the memory unit.