JPH05308536A - Aspect ratio converting device - Google Patents

Abstract

PURPOSE:To convert an aspect ratio to an aspect ratio suitable for video signals by superimposing title signals to the video signals after the aspect ratio of the title signals is converted to the aspect ratio same as that of the video signals based on an aspect ratio discriminating signal. CONSTITUTION:The video signals are supplied through a video signal input terminal 1 to an adder 2. The aspect ratio discriminating signal from an aspect ratio discriminating signal input terminal 4 and the title signals from a title generating circuit 5 are supplied to a 4:3=16:9 pulse width conversion circuit 3. The title signals are converted to the aspect ratio corresponding to the aspect ratio discriminating signal and supplied to the adder 2. At the adder 2, the title signals are superimposed to the video signals.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aspect ratio converter for converting the aspect ratio of a character signal or a graphic signal superimposed on a video signal so as to correspond to the aspect ratio of the video signal.

[0002]

2. Description of the Related Art For example, an image pickup signal shot by a video camera is monitored on a current screen having an aspect ratio of 4: 3. A superimpose function for superimposing a character signal and a graphic signal (hereinafter, referred to as a title signal) on this video signal is known. By superimposing the title signal on the video signal, it becomes possible to superimpose a desired character or figure (hereinafter referred to as a title) on the video.

The screen has an aspect ratio of 16:
A television having a wide screen of 9 has been put into practical use. A video camera for obtaining a video signal corresponding to such an aspect ratio of the screen has been considered. As in the above case, by superimposing the title signal on the image pickup signal shot by the video camera,
It is possible to obtain a title suitable for the size of the screen.

[0004]

When the video signal on which the title signal is superimposed is reproduced on the current screen, for example, a title having an aspect ratio of 4: 3 is displayed. When a video signal having a title signal that is displayed in a normal aspect ratio on the current screen is reproduced on a wide screen, the title is displayed horizontally. Further, when a video signal having a title signal displayed in a normal aspect ratio on a wide screen is reproduced on the current screen, the title is displayed vertically. Therefore, an image different from the user's intention to display a title having an appropriate aspect ratio on the reproduced image is formed. In other words, the aspect ratio of the image on the screen and the title is different,
An uncomfortable image is displayed on the monitor.

Therefore, an object of the present invention is to provide an aspect ratio conversion device capable of converting the aspect ratio of a title signal into an aspect ratio suitable for a video signal based on the aspect ratio discrimination signal.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a terminal to which an aspect ratio discrimination signal indicating the first aspect ratio or the second aspect ratio is input, and a title to be superimposed on a video signal are provided. It is an aspect ratio conversion device including a title generation circuit for generation and an aspect ratio conversion circuit for converting an aspect ratio of a title in accordance with an aspect ratio discrimination signal.

Further, according to the present invention, a terminal to which an aspect ratio discrimination signal indicating whether the aspect ratio is 4: 3 or the aspect ratio is 16: 9 is input, and a title to be superimposed on the video signal is generated. The aspect ratio conversion device includes a title generation circuit and an aspect ratio conversion circuit that converts an aspect ratio of a title in accordance with an aspect ratio determination signal.

[0008]

The aspect ratio discrimination signal from the aspect ratio discrimination signal input terminal 4 and the title signal from the title generation circuit are supplied to the pulse width conversion circuit. Further, in the pulse width conversion circuit, the title signal is converted into an aspect ratio corresponding to the aspect ratio discrimination signal and superposed on the video signal by the adder.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of an aspect ratio conversion device to which the present invention is applied will be described below with reference to the drawings. In Figure 1,
A circuit block diagram in the case of displaying an image with a title superimposed on a wide monitor having an aspect ratio of 16: 9 is shown. In FIG. 1, a video signal including a luminance signal Y and a color signal C is input from a video signal input terminal 1 and supplied to the adder 2. This video signal is converted into a video signal having an aspect ratio of 16: 9, corresponding to a wide monitor described later. Further, an aspect ratio discrimination signal indicating that the video signal is 4: 3 is added to the video signal in the vertical blanking period, for example.

An aspect ratio discrimination signal is supplied via an aspect ratio discrimination signal input terminal 4 to a 4: 3⇒16: 9 pulse width conversion circuit 3 for converting the pulse width of the superimposed title. The user inputs a desired title (aspect ratio is 4: 3) from the title generation circuit 5. When the aspect ratio determination signal is "16: 9", the aspect ratio of the title signal input from the title generation circuit 5 is converted from 4: 3 to 16: 9. As the title generation circuit 5, both a title composing function built in the video camera and a title input device such as an externally connected titler can be used. The output signal of the 4: 3 → 16: 9 pulse width conversion circuit 3 is supplied to the adder 2.

In the adder 2, the title signal having the aspect ratio converted for the wide monitor is superimposed on the video signal having the aspect ratio converted for the wide monitor.
The output signal from the adder 2 has an aspect ratio of 16:
9 is supplied to the wide monitor 6.

FIG. 2 shows an example of the circuit configuration of the 4: 3 → 16: 9 pulse width conversion circuit 3. In FIG. 2, 1
The aspect ratio of the title signal L supplied to the H delay memory 7 is 4: 3, and the data width thereof is t. The title signal L input to the 1H delay memory 7 is 1
After being delayed by H, it is read at a clock period of 3/4. Therefore, the data width of the title signal M, which is the output signal of the 1H delay memory 7, is set to 3 / 4t. In this way, by setting the data width to 3/4 t, the aspect ratio is set to the aspect ratio corresponding to the video signal of 16: 9. Therefore, the aspect ratio of the title signal and the video signal superimposed by the adder 2 becomes the same, and the video and title corresponding to the wide monitor 6 can be obtained.

FIG. 3 is a circuit block diagram for displaying a video on which a title is superimposed on a monitor having an aspect ratio of 4: 3. In FIG. 3, a video signal including a luminance signal Y and a color signal C is input from the video signal input terminal 11 and supplied to the adder 12. This video signal is
The aspect ratio is 4: 3, corresponding to the current monitor described later.
Is converted into a video signal. Further, an aspect ratio determination signal indicating that the video signal is 16: 9 is added to the video signal in the vertical blanking period, for example.

The aspect ratio discrimination signal is supplied to the 16: 9⇒4: 3 pulse width conversion circuit 13 for converting the pulse width of the superimposed title, through the aspect ratio discrimination signal input terminal 14, and A title desired by the user from the title generation circuit 15 (aspect ratio of 16:
9) is input. Aspect ratio discrimination signal is "4: 3"
In this case, the aspect ratio of the title signal input from the title generation circuit 5 is converted from 16: 9 to 4: 3. The output signal of the 16: 9 → 4: 3 pulse width conversion circuit 13 is supplied to the adder 12.

In the adder 12, the title signal whose aspect ratio has been converted for the current monitor is superimposed on the video signal whose aspect ratio has been converted for the current monitor. The output signal from the adder 12 has an aspect ratio of 4: 3 as a video signal and a title signal having a correct aspect ratio.
Is supplied to the current monitor 16.

FIG. 4 shows an example of the circuit configuration of the 16: 9 → 4: 3 pulse width conversion circuit 13. In FIG.
The aspect ratio determination signal input from the aspect ratio determination signal input terminal 14 is the switch SW1 and the switch SW2.
And the switching of these switches is controlled by the aspect ratio discrimination signal. The title control signal CS input from the terminal 21 is the terminal a of the switch SW1.
Is supplied to. The terminal b of SW1 is connected to the terminal d of the switch SW2 via the 4: 3 title generation circuit 22. On the other hand, the terminal c of the switch SW1 is connected to the terminal e of the switch SW2 via the 16: 9 title generation circuit 23. The 4: 3 title generation circuit 22 or the 16: 9 title generation circuit 2 via the terminal f of the switch SW2.
3 output signal is taken out from the terminal 24.

With such a configuration, for example, when the aspect ratio discrimination signal extracted from the video signal is "4: 3", the terminal a of the switch SW1 and the terminal f of the switch SW2 are respectively terminals b. And terminal d. As a result, the aspect ratio is 4: based on the control of the title control signal CS input from the terminal 21.
The title signal of 3 is supplied to the terminal 24. Also,
The aspect ratio discrimination signal extracted from the video signal is "1.
In the case of 6: 9 ”, the terminal a of the switch SW1 and the terminal f of the switch SW2 are switched to the terminal c and the terminal e, respectively. As a result, the aspect ratio becomes 1 based on the control of the title control signal CS input from the terminal 21.
A title signal of 6: 9 is output from the terminal 24.

The specific structure of the pulse width conversion circuit is as follows.
The circuit is not limited to the one shown in FIG. 2 or FIG.

[0019]

According to the present invention, the aspect ratio of the title signal is converted based on the aspect ratio discrimination signal. Therefore, the aspect ratio of the title signal is made the same as the aspect ratio of the video signal, and the video and the title can be displayed on the monitor with an appropriate aspect ratio.

[Brief description of drawings]

FIG. 1 is a circuit block diagram of a television to which the present invention is applied.

FIG. 2 is a circuit block diagram of an aspect ratio conversion device according to the present invention.

FIG. 3 is a circuit block diagram of a television to which the present invention is applied.

FIG. 4 is a circuit block diagram of an aspect ratio conversion device according to the present invention.

[Explanation of symbols]

 3 4: 3⇒16: 9 pulse width conversion circuit 4, 14 Discrimination signal input terminal 13 16: 9⇒4: 3 pulse width conversion circuit

Claims (2)

[Claims] 1. A terminal to which an identification signal indicating whether the aspect ratio is the first aspect ratio or the second aspect ratio is input, title generating means for generating a title to be superimposed on a video signal, and the identification signal. An aspect ratio conversion device comprising an aspect ratio conversion means for converting the aspect ratio of the above-mentioned title. 2. The first aspect ratio is 4: 3 and the second aspect ratio is 16: 9.
Aspect ratio converter described.