JP3128286B2 - Television receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver for receiving a television signal having an aspect ratio different from that of a current system.

[0002]

2. Description of the Related Art In recent years, television receivers for receiving and projecting television signals having an aspect ratio different from that of the current system, such as HDTV and second-generation EDTV, have been developed. In addition, when a movie or the like is used as a basis, an image that is conscious of a wide screen is being created even in the current television signal due to the copyright and the sense of power of the wide screen. Accordingly, a television receiver having a wide screen corresponding to this has been developed.

An HDTV signal is, for example, MUSE (Multip
le Sub-nyquist Sampling), and is transmitted after being subjected to band compression (hereinafter referred to as a MUSE signal). On the receiving side, the original HDTV signal is restored by decoding the MUSE signal.

However, an MU that decodes a MUSE signal
Since the SE decoder is technically difficult and expensive, the M decoder that converts the MUSE signal into the current NTSC signal is used.
USE / NTSC converters have also been developed. MUS
The provision of the E / NTSC converter makes it possible to reduce the cost of the television receiver.

[0005] In order to display the current television signal on a screen having a wide aspect ratio, a method of processing with an NTSC-HD converter is considered. The NTSC-HD converter converts an NTSC signal into a sequential scanning signal and displays the current television signal having an aspect ratio of 4: 3 on a screen having an aspect ratio of 16: 9.

[0006] A television receiver having a wide screen includes a high-vision receiver comprising a MUSE decoder and an NTSC-HD converter, and a MUSE / NTSC receiver.
A wide-screen television receiver including a converter and an NTSC-HD converter is considered.

[0007] Since an apparatus for recording an HDTV signal is still expensive, it is necessary to convert the signal into an NTSC signal for recording. Therefore, even in a high-definition receiver, M
Requires USE / NTSC converter. For these reasons, wide-screen television receivers are promising.

FIG. 4 shows a wide-screen television receiver. The MUSE signal supplied to the input terminal 11 is MU
The signal is input to an analog / digital (hereinafter referred to as A / D) converter 12 constituting the SE / NTSC converter, and is converted into a digital signal. The output of the A / D converter 12 is MU
The signal is input to the SE processing circuit 13 and decoded. MUS
The output of the E processing circuit 13 is the aspect ratio conversion processing circuit 1
4 and 15 and converted into an NTSC signal.

The aspect ratio conversion processing circuits 14 and 15
The aspect ratio is converted so that a video having an aspect ratio of 16: 9 can be displayed on a standard screen having an aspect ratio of 4: 3. Outputs of the aspect ratio conversion circuits 14 and 15 are input to the selector 16. Selector 16
Is input to a digital / analog (hereinafter, referred to as D / A) converter 17 and converted into an analog signal.

The output of the D / A converter 17 constituting the MUSE / NTSC converter is a current NTSC signal.
Therefore, this signal can be led out to the output terminal 25 and recorded by a current recording device.

Further, EDTV processing is performed to display the current NTSC signal of the D / A converter 17 on a wide screen. First, the output of the D / A converter 17 is NTSC-HD
The signal is input to an A / D converter 18 constituting a converter, converted into a digital signal, and then input to an EDTV processing circuit 19.

The EDTV processing circuit 19 converts the current NTSC signal into a 525-line non-interlace signal. The output of the EDTV processing circuit 19 is input to the aspect ratio conversion circuits 20 and 21.

The aspect ratio conversion circuits 20 and 21 convert the aspect ratio so that an image having an aspect ratio of 4: 3 can be displayed on a wide screen having an aspect ratio of 16: 9. Outputs of the aspect ratio conversion circuits 20 and 21 are input to the selector 22 respectively. The output of the selector 22 is D / A
After being input to the converter 23 and converted into an analog signal, it is output to the output terminal 24.

Hereinafter, the MUSE / NT will be described with reference to FIG.
The modes of the SC converter and the NTSC-HD converter will be described. In the MUSE / NTSC converter, three types of screen modes generally called a squeeze mode, a wide mode, and a zoom mode are set. NTS
The C-HD converter processes these screen modes so that they can be displayed on a wide screen by performing through processing, up / down expansion processing, and left / right compression processing. Thereby, it is possible to project on a wide screen in 3 × 3 = 9 display modes. However, among them, only the display mode (No1) in which the aspect ratio is accurate and there is no loss of the image information is the display mode (No1) in which the squeeze mode is through-processed, and the display mode (No5) in which the wide mode is vertically expanded.

Accordingly, the above aspect ratio conversion processing circuit 1
4 and 15 are assumed to have their aspect ratios converted so as to be in the squeeze mode and the wide mode, respectively. The squeeze mode is compressed in the horizontal direction as shown in FIG. 5, and when displayed on a wide screen as it is, all information of the current television signal is displayed. Therefore, when the image is projected on the standard screen, the image is compressed in the horizontal direction. In the wide mode, the aspect ratio is accurate, but the number of scanning lines is reduced to 3/4 (390 lines).
For this reason, the projected image has a low vertical resolution.

[0016]

As described above, the MUS
In a wide-screen television set provided with an E / NTSC converter and an NTSC-HD converter, two screen modes capable of projecting a wide screen with an accurate aspect ratio are set. The first screen mode is a squeeze mode, in which a standard screen is projected vertically long, but a wide screen is projected with a high vertical resolution and an accurate aspect ratio. The second screen mode is a wide mode, in which a standard screen is projected with an accurate aspect ratio, but the vertical resolution is low.

Here, there is a case where the output of the MUSE / NTSC converter is externally derived and recorded, and the recorded signal is reproduced. The squeeze mode is suitable for displaying on a wide screen, and the wide mode is suitable for displaying on a standard screen. For this reason, the viewers are required to use MUSE / NT
When recording the output of the SC converter, it is necessary to select one of the screen modes.

However, as long as an image projected on a wide screen is viewed, the aspect ratio does not change.
There is a problem that it is difficult to determine which screen mode the E / NTSC converter is set to.

Therefore, the present invention has been made to solve the above-mentioned problem, and determines the setting state of the screen mode of the MUSE / NTSC converter, and selectively derives a television signal of the screen mode according to the reproduction screen. It is an object of the present invention to provide a television receiver capable of performing the above-described operations.

[0020]

In order to achieve the above object, the present invention provides a first aspect ratio (4: 3).
Display screen with wide aspect ratio (16: 9)
Wide aspect ratio
Input the television signal of the first aspect ratio
Means for converting to a television signal of
Blanking areas at the top and bottom of wide aspect video
Output the first video signal in wide mode
To the left and right sides of a wide aspect image.
Conversion means capable of outputting a second video signal in a read mode
And the first or second video from the first conversion means
A selector for selecting and outputting a signal, and the selector
An external output terminal from which the selected video signal is derived,
Processing the video signal selected by the selector,
Output a video signal that matches the display screen aspect ratio
Second conversion means, and a video selected by the selector.
A signal that generates a video signal for a small screen by compressing the image signal
Signal processing circuit, and the video signal from the second
The video signal for the picture screen is switched, and two images are displayed on the display screen.
Image switching means for enabling display of
You.

[0021]

According to the above television receiver, the viewer is outside.
The mode of the signal supplied to the
You can see and confirm.

[0022]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a television receiver according to the present invention. The MUSE signal supplied to the input terminal 11 is input to an analog / digital (hereinafter, referred to as A / D) converter 12 constituting a MUSE / NTSC converter, and is converted into a digital signal. The output of the A / D converter 12 is input to the MUSE processing circuit 13 and decoded. The output of the MUSE processing circuit 13 is input to the aspect ratio conversion processing circuits 14 and 15 and converted into an NTSC signal.

The aspect conversion processing circuit 14 converts an image having an accurate aspect ratio onto a standard screen .
Blankin on the top and bottom of the wide aspect video
A wide mode video signal having a video region is output (wide mode). The aspect ratio conversion circuit 15 converts the information so that all information of the wide aspect video can be projected on the standard screen.
Wide aspect video is compressed horizontally.
Output video signal (squeeze mode). Outputs of the aspect ratio conversion processing circuits 14 and 15 are input to the selector 16 respectively. The output of the selector 16 is input to a digital / analog (hereinafter, referred to as D / A) conversion circuit 17 and converted into an analog signal.

The output of the D / A converter 17 constituting the MUSE / NTSC converter is a current NTSC signal.
Therefore, this signal can be led out to the output terminal 25 and recorded by a current recording device.

Furthermore, the current NTSC signal of the MUSE / NTSC converter is displayed on an ED so that it can be displayed on a wide screen.
Perform TV processing. First, the output of the D / A converter 17 is N
The signal is input to an A / D converter 18 constituting a TSC-HD converter, converted into a digital signal, and then input to an EDTV processing circuit 19.

The EDTV processing circuit 19 converts the current NTSC signal into a 525-line non-interlace signal. The EDTV processing circuit 19 includes the aspect ratio conversion circuit 2
0 and 21 are input.

The aspect ratio conversion circuit 20 vertically expands the wide mode television signal set by the aspect ratio conversion circuit 14 so that the television signal is displayed with an accurate aspect ratio on a wide screen.

The aspect ratio conversion circuit 21 performs through processing so that the television signal in the squeeze mode set by the aspect ratio conversion circuit 15 is displayed on a wide screen with an accurate aspect ratio. Here, after being processed by the aspect ratio conversion circuits 20 and 21, the EDTV processing circuit 1
9, the EDTV processing may be performed.

The outputs of the aspect ratio conversion circuits 20 and 21 are input to the selector 22 respectively. Selector 22
Is input to the D / A converter 23, converted into an analog signal, and then input to one end of the image switching circuit 30. Further, in order to display the output of the MUSE / NTSC converter on a small screen formed in a predetermined area of the wide screen, small screen processing is performed.

First, the output of the D / A converter 17 is input to the analog processing circuit 26. Analog processing circuit 26
Converts the current NTSC signal into a luminance signal and two color difference signals. The output of the analog processing circuit 26 is input to an A / D converter 27 and converted into a digital signal, and then input to a digital processing circuit 28. Outputs of the aspect ratio conversion circuits 20 and 21 are input to selectors 22 respectively. The output of the selector 22 is input to the D / A converter 23, converted into an analog signal, and then input to one end of the image switching circuit 30. In addition, MUSE / NTS
In order to display the output of the C converter on a small screen formed in a predetermined area of the wide screen, small screen processing is performed.

The digital processing circuit 28 performs a time axis compression process and a scanning line conversion process using a digital memory. The output of the digital processing circuit 28 is input to the D / A converter 29 and converted into an analog signal, and then input to the other end of the image switching circuit 30. Note that the child screen processing is A
After the digital signal is converted by the / D converter 27, the analog signal may be converted into a luminance signal and a color difference signal by the analog processing circuit 26.

The image switching circuit 30 multiplexes the video signal for wide screen and the video signal for small screen supplied to each input terminal on the time axis, and derives it to the output terminal 24. The image switching circuit 30 is controlled by an analog signal or a digital signal.

Hereinafter, description will be made with reference to FIG. FIG.
(A) MUSE / NTS set to wide mode
This shows a case where the output of the C converter is projected on a small screen having an aspect ratio of 4: 3 formed in a wide screen.
FIG. 2 (b) shows the MUSE /
This shows a case where the output of the NTSC converter is projected on a small screen.

Furthermore, if the small screen processing is provided with a function of displaying a wide aspect ratio and the MUSE / NTSC converter is set to the squeeze mode, the image is displayed at a wide aspect ratio. The child screen shown in b) is as shown in FIG.

Thus, the externally derived MUSE / N
The setting state of the screen mode of the TSC converter can be determined on the screen. Therefore, it is possible to selectively derive a television signal in a screen mode according to a screen to be projected.

Further, when recording a television signal, a control signal for controlling the setting state of the screen mode is transmitted from the recording device to the television receiver, so that the screen mode according to the reproduction screen is selected. good.

In the embodiment described above, the MUSE
Although the output of the / NTSC converter is projected on the sub-screen in the wide screen, the output of the MUSE / NTSC converter and the output of the NTSC-HD converter may be switched to be projected on the wide screen, respectively. .
In place of the image display, the setting state of the screen mode may be displayed by characters or the like.

[0039]

As described above, according to the television receiver of the present invention, the setting state of the screen mode of the MUSE / NTSC converter is determined, and the television signal of the screen mode according to the playback screen is selected and derived. can do.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a television receiver according to the present invention.

FIG. 2 is an exemplary view for explaining operation of the television receiver shown in FIG. 1;

FIG. 3 is an exemplary view for explaining the operation of the television receiver shown in FIG. 1;

FIG. 4 is a configuration diagram showing a conventional television receiver.

FIG. 5: MUSE / NTSC converter, NTSC-
The figure for explaining the mode of the HD converter.

[Explanation of symbols]

11 input terminal, 12, 18, 27 ... A / D converter, 1
3: MUSE processing circuit, 14, 15, 20, 21 ... aspect ratio conversion circuit, 16, 22 ... selector, 17, 2
3, 29: D / A converter, 19: EDTV processing circuit, 2
4, 25 output terminal, 26 analog processing circuit, 28
Digital processing circuit, 30 ... Image switching circuit.

Claims (2)

(57) [Claims] A first aspect ratio of 4: 3;
With a display screen with an ideal aspect ratio (16: 9)
In a revision receiver, a television signal with a wide aspect ratio is input and
Means for converting into a television signal of the first aspect ratio
The means are provided at the top and bottom of the wide aspect image.
Wide mode first video signal with ranking area
And output wide aspect video in the horizontal direction.
Can output the second video signal in squeeze mode compressed to
First converting means, and the first or second video signal from the first converting means.
And a video signal selected by the selector is derived.
Processing an external output terminal and a video signal selected by the selector,
Output video signal adapted to the aspect ratio of the display screen
A second converting means for compressing the video signal selected by the selector.
A signal processing circuit for generating a video signal for the child screen, a video signal from the second conversion means, and a video signal for the child screen.
Switch the image signal so that two images can be displayed on the display screen.
And an image switching means . 2. The signal processing circuit according to claim 1, further comprising :
A squeeze mode from the selector.
When the first video signal of
2. The television receiver according to claim 1, wherein a child screen having the same ratio can be displayed .