JPH0583655A - Television receiver - Google Patents

Abstract

PURPOSE:To select and output the TV signal of a screen mode accordant with the screen to be reproduced while looking at the screen by projecting the output of a MUSE/NTSC converter in order to decide the mode of a 1st screen. CONSTITUTION:The MUSE signal received from an input terminal 11 is converted into a wide mode by an aspect ratio conversion processing circuit 14 and also converted into a squeeze mode by an aspect ratio converter circuit 15. These processed TV signals undergone the conversion of aspect ratios are selected and outputted by a selector 16 and then turned into the wide screen video signals accordant with the wide aspect ratios converted by the aspect ratio converter circuits 20 and 21. Meanwhile the TV signal selected and outputted by the selector 16 undergoes the time base compression processing and the scan line number conversion processing through a digital processing circuit 28 and is turned into a slave screen video signal. Then an image switching circuit 30 outputs the wide and slave screen video signals after applying the time base multiplexing to these signals.

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 the current system.

[0002]

2. Description of the Related Art In recent years, television receivers such as HDTV and second generation EDTV have been developed which receive and display a television signal having an aspect ratio different from the current system. In addition, when a movie or the like is used as a base, even in a current television signal, an image in which a wide screen is conscious has been created due to the copyright and the power of the wide screen. Therefore, a television receiver having a wide screen corresponding to this has been developed.

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

However, the MU which decodes the MUSE signal
Since the SE decoder is technically difficult and expensive, an M decoder that converts a MUSE signal into a current NTSC signal is used.
A USE / NTSC converter has also been developed. MUS
By providing the E / NTSC converter, the cost of the television receiver can be reduced.

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

A television receiver having a wide screen includes a high-definition television receiver including a MUSE decoder and an NTSC-HD converter, and a MUSE / NTSC receiver.
A wide television receiver including a converter and an NTSC-HD converter can be considered.

Since an apparatus for recording an HDTV signal is still expensive, it is necessary to convert it into an NTSC signal for recording. Therefore, even in high-definition TV receivers, M
Requires a USE / NTSC converter. For this reason, wide television receivers are regarded as promising.

FIG. 4 shows a wide television receiver. The MUSE signal supplied to the input terminal 11 is the MU
It is input to an analog / digital (hereinafter referred to as A / D) converter 12 which constitutes an SE / NTSC converter and converted into a digital signal. The output of the A / D converter 12 is the MU
It 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
It is input to 4, 15 and converted into an NTSC signal.

The aspect ratio conversion processing circuits 14 and 15 are
The aspect ratio is converted so that an image having an aspect ratio of 16: 9 can be displayed on a standard screen having an aspect ratio of 4: 3. The outputs of the aspect ratio conversion processing circuits 14 and 15 are input to the selector 16, respectively. Selector 16
Is output 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 the current NTSC signal.
Therefore, this signal can be led to the output terminal 25 and recorded by the existing recording device.

Further, EDTV processing is performed in order 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 the A / D converter 18 forming a converter and converted into a digital signal, and then input to the EDTV processing circuit 19.

The EDTV processing circuit 19 converts the current NTSC signal into a non-interlaced signal of 525 scanning lines. 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 of an image having a 4: 3 aspect ratio into a wide screen having an aspect ratio of 16: 9. The 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 led to the output terminal 24.

Hereinafter, referring to FIG. 5, the above MUSE / NT will be described.
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 squeeze mode, wide mode, and zoom mode are set. NTS
The C-HD converter processes these screen modes so that they can be displayed on a wide screen by through processing, vertical expansion processing, and horizontal compression processing. Thereby, it is possible to display on a wide screen in 3 × 3 = 9 display modes. However, of these, the only ones having an accurate aspect ratio and no loss of image information are the display mode in which the squeeze mode is through processed (No1) and the display mode in which the wide mode is vertically expanded (No5).

Therefore, the above aspect ratio conversion processing circuit 1
It is assumed that the aspect ratios 4 and 15 are converted so that the squeeze mode and the wide mode are set, respectively. The squeeze mode is compressed in the horizontal direction as shown in FIG. 5, and when it is displayed on the wide screen as it is, all the information of the current television signal is displayed. Therefore, when the image is displayed 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 thinned to 3/4 (390).
Therefore, the projected image has a low vertical resolution.

[0016]

As mentioned above, the MUS
In a wide television receiver including an E / NTSC converter and an NTSC-HD converter, two screen modes capable of displaying on a wide screen with an accurate aspect ratio are set. The first screen mode is a squeeze mode, in which a standard screen displays images in a portrait orientation, but a wide screen displays images with a high vertical resolution and an accurate aspect ratio. The second screen mode is a wide mode, and a standard screen is displayed with an accurate aspect ratio, but the vertical resolution is low.

Here, there are cases where the output of the MUSE / NTSC converter is externally derived and recorded, and this 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. Therefore, the viewer is MUSE / NT
When recording the output of the SC converter, it is necessary to select one of the screen modes.

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

Therefore, the present invention has been made to solve the above problems, and determines the setting state of the screen mode of the MUSE / NTSC converter, and selectively derives the television signal of the screen mode according to the reproduction screen. An object of the present invention is to provide a television receiver that can be used.

[0020]

In a television receiver according to the present invention, a television signal having a wide aspect ratio different from that of the current system is selectively adapted by adapting the aspect ratio or the wide aspect ratio of the current system. First conversion means for converting to obtain a first screen and second screen obtained by deriving the first screen obtained by the first conversion means, and at least performing aspect ratio conversion to adapt to a wide aspect ratio Second conversion means for obtaining the above, and the first and second
And an image switching unit for projecting the second screen in a predetermined area formed in the first screen.

[0021]

In the above means, the output of the MUSE / NTSC converter is displayed to determine the screen mode of the first screen. Therefore, the viewer can select and derive the television signal in the screen mode according to the screen to be reproduced while watching the screen.

[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 that constitutes a MUSE / NTSC converter and 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 ratio conversion processing circuit 14 performs conversion so that the standard screen can be displayed with an accurate aspect ratio (wide mode). The aspect ratio conversion processing circuit 15
Converts all the information of the current television signal so that it can be displayed on the standard screen (squeeze mode). The 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 the current NTSC signal.
Therefore, this signal can be led to the output terminal 25 and recorded by the existing recording device.

Further, the current NTSC signal of the MUSE / NTSC converter is displayed on the 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 the A / D converter 18 constituting the TSC-HD converter, converted into a digital signal, and then input to the EDTV processing circuit 19.

The EDTV processing circuit 19 converts the current NTSC signal into a non-interlaced signal of 525 scanning lines. The EDTV processing circuit 19 includes the aspect ratio conversion circuit 2
It is input to 0 and 21.

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

The aspect ratio conversion circuit 21 performs through processing on the television signal in the squeeze mode set by the aspect ratio conversion circuit 15 so that it is displayed on the 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
EDTV processing may be performed in step 9.

The outputs of the aspect ratio conversion circuits 20 and 21 are input to the selector 22, respectively. Selector 22
Is output 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 child screen formed in a predetermined area of the wide screen, child screen processing is performed.

First, the output of the D / A converter 19 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 the A / D converter 27 and converted into a digital signal, and then input to the digital processing circuit 28.

The digital processing circuit 28 uses a digital memory to perform time axis compression processing and scanning line conversion processing. The output of the digital processing circuit 28 is input to the D / A converter 29, converted into an analog signal, and then input to the other end of the image switching circuit 30. In addition, the sub-screen processing is A
After the digital signal is converted by the / D converter 27, it may be converted by the analog processing circuit 26 into a luminance signal and a color difference signal.

The image switching circuit 30 time-axis-multiplexes the wide-screen video signal and the sub-screen video signal supplied to the respective input terminals and outputs them 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. Figure 2
(A) is MUSE / NTS set to wide mode
It shows a case where the output of the C converter is displayed on a child screen having an aspect ratio of 4: 3 formed in the wide screen.
FIG. 2B shows MUSE / set to squeeze mode.
The case where the output of the NTSC converter is displayed on the child screen is shown.

Further, if the MUSE / NTSC converter is set to the squeeze mode and the wide-screen aspect ratio is provided in the small screen processing, the wide-screen aspect ratio is displayed. The child screen shown in b) is as shown in FIG.

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

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 corresponding to the reproduction screen is selected. good.

In the embodiment described above, MUSE
Although the output of the / NTSC converter is displayed on the child screen in the wide screen, the output of the MUSE / NTSC converter and the NTSC-HD converter may be switched to display on the wide screen. ..
Further, instead 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 according to the present invention, the setting state of the screen mode of the MUSE / NTSC converter is discriminated and the television signal of the screen mode corresponding to the reproduction screen is selectively derived. can do.

[Brief description of drawings]

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

FIG. 2 is a diagram for explaining the operation of the television receiver shown in FIG.

FIG. 3 is a diagram for explaining the operation of the television receiver shown in FIG.

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

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

[Claims] 1. A first conversion means for obtaining a first screen by selectively converting a television signal having a wide aspect ratio different from that of the current system to the aspect ratio or wide aspect ratio of the current system. And second conversion means for deriving the first screen obtained by the first conversion means and at least converting the aspect ratio to obtain a second screen adapted to a wide aspect ratio, A television receiver comprising: an image switching unit that switches between two screens to be displayed. 2. The television receiver according to claim 1, further comprising image processing means for displaying the second screen in a predetermined area formed in the first screen.