JPH03101575A - Television receiver - Google Patents

Abstract

PURPOSE:To allow the user to observe a title even when it exists on a non- display portion by detecting title information from the non-display portion and displaying the title onto a display screen of a display portion based on the information superimposingly. CONSTITUTION:A conversion output of an A/D converter 22 is fed to an AND circuit 29. A timing signal inputted from a terminal 28 is fed also to the AND circuit 29. The timing signal represents a period outputted from the A/D converter 22 as a portion not displayed as a picture in an input television signal and the gate of the AND gate 29 is opened for the period. Thus, the non-display portion of the input television signal is fed to a comparator circuit 30 and the television signal of the title in existence on the on-display portion is extracted, The conversion output of a scanning line conversion circuit 32 is synthesized with the conversion output of a time axis conversion circuit 24 with an OR circuit 25 and the title is superimposed on the display pattern.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a television receiver that displays an image in an image display area based on a portion of an input television signal, for example, The present invention relates to a television receiver having an image display area having a different aspect ratio from a human input television signal and displaying an image therein based on a portion of an input television signal.

(Prior Art) In recent years, in television broadcasting systems, HDTV and EDTV systems having an aspect ratio of 3:5 or 9:16 have been proposed as next-generation television systems. These wide aspect type television receivers are also required to receive television signals with a conventional aspect ratio of 4:3.

FIG. 5 is a circuit diagram showing the configuration of a conventional television receiver capable of displaying a television signal with an aspect ratio of 3:4 in an image display area with an aspect ratio of 9:16.

In the figure, a television signal in an interlace format with an aspect ratio of 3=4 and a number of scanning lines of 525 is inputted from an input terminal 11 by an analog/digital conversion circuit (hereinafter referred to as an A/D conversion circuit) 12. converted into a digital signal.

This conversion output is converted into 11 scanning lines by the scanning line conversion circuit 13.
It is converted into 25 television signals.

This conversion output is time-compressed or time-expanded by the time axis conversion circuit 14 so that when a television signal depicting a circle is input, the image displayed on the monitor becomes a perfect circle. This time-base conversion output is converted into an analog signal by a digital/analog conversion circuit (hereinafter referred to as a D/A conversion circuit) 15. This conversion output has an aspect ratio of 9:
The signal is supplied to an HDTV monitor 16 having 16 image display areas, and is used for image display.

By the way, if you convert a screen with an aspect ratio of 3:4 to an aspect ratio of 9
There are two methods for displaying in the image display area of :16.

One method is to display a part of the screen with an aspect ratio of 3:4 in an image display area with an aspect ratio of 9:16.

FIG. 6 is a diagram showing an example of this method. The example shown is
Of the screen with an aspect ratio of 324, only the central part (shaded area) with an aspect ratio of 9:16 has an aspect ratio of 9:16.
The image is displayed in the image display area, and the white part is not displayed.

Another method is to display the entire screen with an aspect ratio of 3:4 in an image display area with an aspect ratio of 9:16.

FIG. 7 is a diagram showing an example of this method. In the illustrated example, a screen with an aspect ratio of 3:4 is displayed in the center of an image display area with an aspect ratio of 9:16.

In this way, you can convert a screen with an aspect ratio of 3:4 to an aspect ratio of 9.
: There are two methods for displaying the subtitles in the image display area of 16. In the case of the first method, even if there are subtitles in the part that is not displayed (the white part in the example of Fig. 6), this 7 The problem was that I couldn't see it.

(Problem to be solved by the invention) A part of a screen with an aspect ratio of 3:4 is converted to an aspect ratio of 9:1.
In conventional television receivers that display images in the image display area based on a part of the input television signal, such as the television receiver that displays images in the image display area No. 6, among the input television signals, There is a problem in that even if there are subtitles in a portion that is not displayed as an image, the subtitles cannot be viewed.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a television receiver that allows the user to view subtitles even if the subtitles are present in a portion that is not displayed as an image.

[Structure of the Invention] (Means for Solving the Problem) In order to achieve the above object, the present invention provides a means for detecting subtitle information from a portion of a human-powered television signal that is not provided for image display; The apparatus is provided with means for superimposing and displaying subtitles represented by the subtitle information provided on the display screen of a portion of the human-powered television signal that is provided for image display.

(Function) According to the above configuration, when subtitles exist in a portion of the input television signal that is not provided for image display, the subtitles are detected by the subtitle information detection means and are displayed in the portion that is provided for image display. superimposed on the screen. Therefore, even if a subtitle exists in a portion that is not displayed as an image, the user can view the content.

(Embodiments) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a circuit diagram showing the configuration of an embodiment of the present invention.

In the following explanation, this invention will be described with an aspect ratio of 3:4.
A typical example will be described in which the present invention is applied to a television receiver that displays an image in an image display area with an aspect ratio of 9:16 based on a portion of a conventional television signal.

In the figure, a television signal in an interlaced format with an aspect ratio of 3:4 and a number of scanning lines of 525 inputted from an input terminal 21 is converted into a digital signal by an A/D conversion circuit 22. This conversion output is converted by the scanning line conversion circuit 23 into a television signal having 1125 scanning lines. This conversion output is the time axis conversion circuit 14
The vertical and horizontal scale of the screen can be adjusted, and the number of scanning lines is 1.
It is converted into a television signal with 125 lines and an aspect ratio of 9:16. This television signal is combined by an OR circuit 11 with a subtitle television signal, which will be described later. This combined output is converted into an analog signal by the D/A conversion circuit 25. This converted output is supplied to the HDTV monitor 27 and used to display an image in an image display area with an aspect ratio of 9:16.

The converted output of the A/D conversion circuit 22 is further supplied to an AND circuit 29. This AND circuit 29 is further supplied with a timing signal input from a terminal 28 . This timing signal is a part of the human-powered television signal that is not used for image display (hereinafter referred to as a non-display part).
It shows the period of output from the D conversion circuit 22, and this period,
Open the gate of AND circuit 29. As a result, the non-display portion of the human-powered television signal is supplied to the comparator circuit 30. By comparing the level of the input signal with a preset reference level, the comparison circuit 30 extracts only the portion of the input signal whose level is higher than the reference level. As a result, the television signal of the subtitles present in the non-displayed portion is extracted. The reason why it is possible to separate the video portion and the subtitle portion through this comparison process is that in a television signal, the subtitle portion has a higher level than the video portion. Noise components are removed from the output of the comparison circuit 30 by a noise removal circuit 31. This noise removal circuit 31
The output of the scanning line conversion circuit 32 converts the number of scanning lines to 11.
Converted to 25 pieces.

This conversion output is converted by the time axis conversion circuit 33 into a signal with an aspect ratio of 9:16. This conversion output is combined with the conversion output of the time axis conversion circuit 24 by an OR circuit 25. As a result, the subtitles existing in the non-display part are replaced with the part of the input television signal that is provided for image display (hereinafter referred to as
(referred to as the "display part") is displayed in a superimposed state on the display screen.

Note that, in FIG. 1, a time adjustment delay circuit for superimposing subtitles present in the non-display portion on the display screen of the display portion is omitted.

FIG. 2 is a circuit diagram showing an example of a specific configuration of the noise removal circuit 31.

The illustrated noise removal circuit 31 is a so-called isolated point removal circuit.

In the figure, a signal input from an input terminal 41 is sequentially delayed by one horizontal scanning period by three line memories 42, 43, and 44 connected in series. Each line memory 4
The delayed outputs of 2, 43, and 44 are latched by latch circuits 45, 46, 47, and 48 driven by a clock of one pixel period.

As a result, five pixels P, , P2 . P3. P4. The P5 signal is output at the same time. Here, P is the pixel of interest, and the pixel P
1 is a pixel one horizontal scanning line above this pixel of interest P, pixel P2 is a pixel one pixel to the left, and pixel P4
is a pixel one pixel to the right, and pixel P is a pixel one horizontal scanning line below.

Pixels other than the pixel of interest P, P+, P2, P4, P%
The signal is supplied to the OR circuit 49. The output of the OR circuit 49 and the signals of the target pixel P are supplied to an AND circuit 50. The output of this AND circuit 50 is output from an output terminal 51.

In such a configuration, the signal of the pixel of interest P is transmitted from the surrounding four pixels P, , P2 . It is output only if there is a signal in any one of P, PS, and if there is no signal in any one, it is regarded as an isolated point signal and is not output. As a result, such isolated signals are removed as noise components.

As described above, this embodiment is provided with a comparison circuit 30 that detects subtitle television signals from non-displayed areas, and the signal detected by this comparison circuit 30 is superimposed on the displayed areas. Subtitles can be superimposed on the display screen. Thereby, even if subtitles exist in a non-displayed portion, the subtitles can be viewed.

Furthermore, there is an advantage that the subtitles can be checked on the display screen of the display section at the same time as the image of the display section.

FIG. 4 is a circuit diagram showing the configuration of another embodiment of the present invention.

In FIG. 4, the processing configuration of the display portion is the same as in FIG. 1, so the same reference numerals are given to this portion, and the processing configuration of the non-display portion will be mainly described.

The converted output of the A/D conversion circuit 41 is supplied to a character recognition circuit 61. This character recognition circuit 61 recognizes characters existing in the non-display portion from an input signal.

As a result, subtitle information present in the non-displayed portion is detected as characters on this subtitle. This character detection output is supplied to a character pattern generation circuit 62.

The character pattern generation circuit 62 refers to the character pattern ROM 63 based on the character detection output and generates a new television signal for displaying subtitles. This signal is combined with the television signal of the display portion by the OR circuit 25, and is provided for image display. As a result, the subtitles are displayed in a superimposed manner on the display screen of the display portion.

With such a configuration, it is possible to obtain the same effects as in the previous embodiment, as well as recognize the characters on the subtitles and recreate the television signal for displaying the subtitles based on the character recognition output. Therefore, as in the previous example,
The image quality of subtitles can be improved compared to when a television signal for displaying subtitles is directly extracted from a non-display area.

Although two embodiments of the present invention have been described above in detail, the invention is not limited to these embodiments.

For example, in the embodiment shown in FIG. 1, a case has been described in which a scanning line conversion circuit and a time axis conversion circuit are provided independently in each of the display portion and non-display portion, but even if these circuits are used for both. good.

Further, in the previous embodiment, the case where the input television signal and the image display area have different aspect ratios has been described, but the present invention is of course applicable to the case where both have the same aspect ratio.

It goes without saying that the present invention can be modified in various other ways without departing from the spirit thereof.

[Effects of the Invention] As described above, the present invention detects subtitle information from the non-display part and displays the subtitles in a superimposed manner on the display screen of the display part based on this information, so that it is possible to detect subtitle information from the non-display part. Even if the user does, the user may be able to see this.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing the configuration of an embodiment of the present invention, and FIG.
The figure is a circuit diagram showing an example of a specific configuration of the noise removal circuit shown in FIG. 1, FIG. 3 is a diagram for explaining the operation of FIG. 2, and FIG. 4 is a configuration of another embodiment of the present invention. A circuit diagram showing,
FIG. 5 is a circuit diagram showing the configuration of a conventional television receiver, and FIGS. 6 and 7 are diagrams for explaining aspect ratio conversion of a television signal. 21.41... Input terminal, 22... A/D conversion circuit, 23.32... Scanning line conversion circuit, 24.33...
Time axis conversion circuit, 25.49... OR circuit, 26...
・D/A conversion circuit, 27...HDTV monitor, 28
...Terminal, 29.50...AND circuit, 30...
Comparison circuit, 31... Noise removal circuit, 42, 43.4
4... Line memory, 45, 46, 47.48...
Line memory, 51... Output terminal, 61... Character recognition circuit, 62... Character butter generation circuit, 63... Character pattern OM0

Claims (3)

[Claims] (1) An image display means for displaying an image in an image display area based on a part of the input television signal, and subtitle information from the part of the input television signal that is not provided for image display by the image display means. subtitle information detection means for detecting subtitle information, and subtitle display means for superimposing and displaying subtitles represented by the subtitle information on the display screen of the image display means based on the subtitle information detected by the subtitle information detection means. A television receiver characterized by: (2) The subtitle information detection means detects the subtitle television signal by comparing the level of a portion of the television signal that is not provided for image display by the image display means with a reference level. The subtitle display means is configured to superimpose a subtitle television signal detected by the subtitle detection information output means on a portion of the input television signal that is provided for image display by the image display means. A television receiver comprising: (3) The subtitle information detection means is configured to detect characters on the subtitles by character recognition from a portion of the television signal that is not provided for image display in the image display area, and the subtitle display means is configured to subtitle signal generation means for generating the subtitle television signal based on the characters detected by the subtitle information detection means; A television receiver characterized in that it is configured to be superimposed on a portion provided for image display by an image display means.