JPH0983902A - Image receiving device - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To properly determine a screen mode even for a signal from an output terminal. SOLUTION: From the start of processing, data that gives arbitrary distortion to a display screen is formed by discrimination of various ID signals and black band portions, and a new screen mode is displayed in step [7]. is there. In the present invention, the S1 signal is output in step [8] following step [7],
It is determined whether the full mode display is obtained by the VBID signal or the EDTV-2 decoding. Here, in the step [8], when the full mode is displayed by the above condition (Y), 5 V DC is superimposed on the chroma signal of the Y / C separation signal taken out to the output terminal 19 in the step [9]. Then, the VBID signal indicating the full mode is inserted in the vertical blanking period of the video signal, and the process is terminated. If it is not in the full mode under the above condition (N) in step [8], the process is terminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image receiving device having a display screen with a wide aspect ratio of 16: 9, for example.

[0002]

2. Description of the Related Art For example, in a receiver having a 16: 9 wide aspect display screen, when displaying a 4: 3 standard aspect video signal, conventionally, for example, no display is made at the left and right edges of the display screen. Had formed a black belt portion. However, such a display of the black band portion is unpleasant to view, and causes various problems such as accelerated deterioration of the phosphor on the display screen at the boundary with the image portion.

On the other hand, the applicant of the present application has previously proposed 16: 9.
Proposed a receiver suitable for use when a 4: 3 standard aspect video signal is displayed on a wide aspect display screen (see Japanese Patent Application No. 5-1555659). According to the invention of this earlier application, a 4: 3 wide aspect ratio display screen can be displayed in a 4: 3 ratio without generating a black band portion.
It is possible to display a standard aspect video signal.

On the other hand, in the above-mentioned 4: 3 standard aspect video signal, black band portions are further provided on the upper and lower sides to form a wide screen image. Therefore, such a video signal can form a wide screen by expansion. Alternatively, a wide-screen image is formed by compressing the left and right of the image to form a video signal and expanding the image to the left and right.

Therefore, when these images are displayed on the above-mentioned 16: 9 wide aspect display screen, the above-mentioned upper and lower black band portions are discriminated, or the ID signal inserted in the video signal. Has been developed to automatically expand a video signal or arbitrarily expand the video signal. According to this, when the original video signal is displayed, the optimum screen mode is always automatically selected and displayed.

That is, for example, with respect to an original 4: 3 standard aspect video signal as shown in FIG. 3A, for example, the left and right sides of the display screen are 1 as shown in FIG. 3B.
A zoom mode for enlarging the entire screen to match the left and right of the 6: 9 wide aspect display screen, and C in FIG.
As shown in, it is possible to perform display such as a full mode in which only the horizontal direction of the screen is expanded.

Further, as shown in D of FIG. 3, the wide zoom mode in which the whole is enlarged and then the upper and lower ends are compressed, the subtitled mode in which only the lower side is compressed as shown in E of FIG. As shown, it is possible to select a screen mode such as a normal mode in which the display is kept as 4: 3.

By the way, for example, in a video camera integrated with a VTR for consumer use, an apparatus for compressing the left and right of a display screen to form a video signal is implemented. For such a video signal, by expanding the display screen in the left-right direction in the above-described full mode, a 16: 9 wide aspect display screen can be obtained without causing image distortion.

Further, in such a video camera,
In some models, a display signal (referred to as an S1 signal) indicating that the left and right sides of the display screen described above are compressed by superimposing DC 5V on the chroma signal of the output obtained by separating the luminance signal and the chroma signal. And that is being done. In other models, a display signal (called a VBID signal) indicating that the left and right sides of the display screen are compressed is inserted in the vertical blanking period of the video signal.

In addition, for example, in reception of a broadcast signal of EDTV-2, a so-called letterbox size video signal is supplemented with a reinforcement signal or the like inserted in the three-dimensional frequency conjugate region of the chroma signal of the non-image part. Decoding such as interpolation of scanning lines is performed. Therefore, such an EDTV
In the case of -2 as well, the decoded video signal is in a format in which the left and right sides of the display screen are compressed.

Therefore, in the above-mentioned device, the determination for automatically selecting the screen mode is made as shown in the flowchart of FIG. 4, for example. That is, in FIG.
When the process is started, the information of the above-mentioned S1 signal is fetched in step [1]. Next, in step [2], the above-mentioned VB
Information of the ID signal is captured. Further step [3]
The information of EDTV-2 is taken in. Further, in step [4], the discrimination information of the black belt portions provided above and below is taken in.

Further, in step [5], it is determined whether or not automatic switching of screen mode selection is set. Then, when the automatic switching is set in step [5] (Y), in step [6], data which gives an arbitrary distortion to the display screen is formed on the basis of the above-mentioned captured information, and step [7] ], A new screen mode is displayed, and the process ends. If the automatic switching is not set in step [5] (N), the process is terminated.

In this way, the ID signal (S1 signal, VBID signal) inserted in the above-mentioned video signal is detected,
Alternatively, it is possible to automatically select the screen modes by discriminating the black belt portions provided above and below. Such enlargement or expansion of the screen can be performed, for example, by non-linearly controlling the deflection system of the picture tube or by controlling the writing / reading address of the image processing memory provided in the video signal system.

[0014]

However, in such a device, when the output terminal for the video signal and the audio signal from the device is provided, for example, when the display is performed in the full mode, A video signal obtained by compressing the left and right sides of the display screen is output to the output terminal. In this case, in the video signal from the above video camera, the above S
Since one signal and VBID signal are taken out to the output terminal as they are, no problem occurs.

However, in the case of the video signal obtained by decoding the above-mentioned EDTV-2, the above-mentioned S1 signal, VBID
No ID signal corresponding to the signal is provided. For this reason, for example, when a signal from the output terminal is supplied to another 16: 9 wide aspect display device, the left and right compressed images are displayed in the normal mode as they are, which may cause a malfunction to the user. It would be misleading and force you to perform complicated operations such as manually switching to full mode.

Further, even when the signal from this output terminal is recorded by a VTR or the like, when this is reproduced and supplied to a display device having a wide aspect ratio of 16: 9, the left and right sides are compressed as they are as described above. The displayed image is displayed in normal mode, giving the user the misunderstanding that it is a malfunction,
You will be forced to perform complicated operations such as manually switching to full mode.

This application has been made in view of such a point, and the problem to be solved is that the left and right are compressed at the output terminals when displaying in the full mode. If the video signal is taken out, the user may misunderstand that it is out of order or may be forced to perform a complicated operation such as manually switching to the full mode.

[0018]

For this reason, in the present invention, when the full mode display is performed, a predetermined direct current is superimposed on the chroma signal output to the output terminal to provide a discrimination signal. According to this, it is possible to satisfactorily determine the screen mode even in the device to which the signal from the output terminal is supplied.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION That is, in the present invention, the size of the screen on which the image in the input video signal is displayed is discriminated, and the display size of the video signal is automatically determined according to the discriminated screen size. In an image receiving device having a screen mode switching means for switching to, in a screen mode having an output terminal of at least a video signal in which a luminance signal and a chroma signal are separated and extending and displaying the display size of the video signal only left and right, A predetermined direct current is superimposed on the chroma signal output to the output terminal to serve as a discrimination signal.

The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of an example of an image receiving apparatus to which the present invention is applied. In FIG. 1, the signal from the terrestrial antenna 1 is supplied to the U / V tuner 2. Further, a signal from a microcomputer (.mu.-COM) 3 for tuning is supplied to the U / V tuner 2 to receive a desired UHF or VHF broadcast signal.

Further, the signal from the satellite antenna 4 is CS /
It is supplied to the BS tuner 5. Further, a signal from a microcomputer (.mu.-COM) 6 for channel selection is supplied to the CS / BS tuner 2 to receive a broadcast signal from a desired broadcast satellite (BS) or communication satellite (CS). The video signal and the audio signal received by these tuners 2 and 5 are supplied to the switching circuit 7, respectively.

Further, for example, a video signal in which a luminance signal (Y) and a chroma signal (C) from a video camera (not shown) are separated, a composite video signal (V), and left and right audio signals (L,
R) through the input terminal 8 respectively the switching circuit 7
Is supplied to. Then, the switching circuit 7 selects a desired signal.

Further, the video signal selected by the switching circuit 7 is supplied to the Y / C separation filter 9 and separated into a luminance signal and a chroma signal. Then, the separated luminance signal and chroma signal are supplied to the decoder 10 of the EDTV-2 and, for example, a reinforcement signal to be inserted into the three-dimensional frequency conjugate region of the chroma signal of the non-picture portion with respect to the video signal of the letterbox size. Decoding such as interpolating the scanning line is performed using.

The video signal from the decoder 10 is supplied to the switching circuit 7 again. Decoder 1
When the video signal input at 0 does not include the above-mentioned reinforcement signal and the like, the input video signal is output as it is without decoding. Also video input terminal 7
If the video signal supplied to is a Y / C separated signal, the signal is selected in the subsequent stage of the decoder 10.

Further, the Y / C separation signal selected by the switching circuit 7 is supplied to the video processing circuit 11. The signal from the video processing circuit 11 is supplied to the picture tube (CRT) 13 through the video output circuit 12. Further, the synchronizing signal from the video output circuit 12 is supplied to the deflection system 15 of the picture tube 13 through the deflection circuit 14. As a result, the video signal received by the tuners 2 and 5 or the video signal supplied to the input terminal 8 is displayed on the picture tube 13.

Further, the audio signal selected by the switching circuit 7 is supplied to the audio processing circuit 16. An audio signal whose volume, balance, sound quality, etc. have been adjusted by the audio processing circuit 16 is supplied to the speaker 18 through the audio output circuit 17. As a result, the audio signal received by the tuner 2, 5 or the audio signal supplied to the input terminal 8 is emitted from the speaker 18.

Further, in this apparatus, the video signal (V) selected by the above-mentioned switching circuit 7, the Y / C separation signal, and the left and right audio signals (L, R) are respectively taken out to the output terminal 19.

Further, in this apparatus, a microcomputer (μ-COM) 20 for main control is provided, and a control signal from the microcomputer 20 is sent through the bus line 21 to the microcomputers 3 and 6 for tuning. Is supplied to each part of the device. Further, the microcomputer 20 is supplied with operation signals from an arbitrary keyboard 22 and a remote control receiver 23.

Further, the video signal and the Y / C separation signal from the switching circuit 7 are supplied to the screen mode discrimination circuit 24. In the screen mode discriminating circuit 24, the VBID signal inserted in the above-mentioned video signal and the S1 signal superposed on the chroma signal supplied to the input terminal 8, and the decoder 10 E
Information indicating that DTV-2 decoding is being performed,
Further, the black band portions provided above and below the luminance signal are detected to determine the screen mode to be selected.

The discrimination information from the discrimination circuit 24 is supplied to the main control microcomputer 20 through the bus line 21. Further, the control signal from the microcomputer 20 for main control is transferred to the bus line 21.
It is supplied to the image processing circuit 11 and the deflection circuit 14 through. As a result, nonlinear control of the deflection system 15 and control of the write / read address of the image processing memory provided in the video processing circuit 11 are performed, and the screen mode is switched by enlarging or expanding the screen.

Further, a microcomputer 2 for main control
A signal associated with the control from 0 is supplied to the display microcomputer (μ-COM) 25. Then, the display signal formed by the microcomputer 25 is
It is supplied to the video processing circuit 11 through C26. Thereby, the picture tube 13 displays the information indicating the content of the control performed by the microcomputer 20, such as the selected screen mode.

It should be noted that the memory 27 stores various control information such as the last channel received last time and its screen mode performed by the microcomputer 20, and setting information for each received broadcast signal. To be done.

Further, in this apparatus, the above-mentioned discrimination of the screen mode is carried out as shown in the flow chart of FIG. That is, in FIG. 2, the process from the start of processing to the display of the new screen mode in step [7] is the same as the conventional one. On the other hand, in this device, in step [8] following step [7], S1 signal, VBID
Whether or not the display in the full mode has been made is determined by the signal or the decoding of the EDTV-2.

Here, when the full mode display is made by the above-mentioned condition in this step [8] (Y), the step is

In [9], the process of superimposing DC 5V on the chroma signal of the Y / C separated signal output to the output terminal 19 is performed,
Further, the VBID signal indicating the full mode is inserted in the vertical blanking period of the video signal, and the processing is ended. If it is not in the full mode under the above condition (N) in step [8], the process is terminated.

Therefore, in this device, for example, an EDTV
Even when full-mode display is performed by decoding -2, when the full-mode display is performed, a predetermined direct current is superimposed on the chroma signal output to the output terminal to form a determination signal. You can

As a result, conventionally, the left and right compressed video signals are taken out from the output terminal, which may give the user a misunderstanding that the video signal is out of order, or force a complicated operation such as manually switching to the full mode. According to the present invention, however, the screen mode can be satisfactorily discriminated even in the device to which the signal from the output terminal is supplied, and these fears can be eliminated.

In the above apparatus, when the normal video signal is displayed in the full mode, the above-mentioned direct current 5V is applied.
Is not superimposed and the VBID signal indicating the full mode is not inserted. Further, even if the EDTV signal whose left and right are compressed is broadcast in the future, if the decoded video signal is taken out to the output terminal 19, the above-mentioned DC 5V is applied.
Are superimposed and the VBID signal indicating the full mode is inserted.

Further, when the decoding of the above-mentioned decoder 10 is stopped and the signal of the letterbox size EDTV-2 is taken out to the output terminal 19 as it is, for example, the VBID signal indicating the zoom mode is changed to the vertical block of the video signal. It may be inserted during the ranking period.

Therefore, in the above device, the tuner 2,
5, the use / non-use of the EDTV-2 decoder, the selected screen mode, 5 V DC (S1) depending on the type of the video signal received at 5 or the video signal supplied to the input terminal 8.
The types of VBID signals to be superimposed and inserted are as shown in Table 1 below.

[0040]

[Table 1]

Thus, according to the above-mentioned receiving device, the size of the screen on which the image in the input video signal is displayed is discriminated, and the display size of the video signal is automatically determined according to the discriminated screen size. In an image receiving device having a screen mode switching means for switching, it has an output terminal for a video signal in which at least a luminance signal and a chroma signal are separated, and outputs in a screen mode in which the display size of the video signal is expanded and displayed only left and right. By superimposing a predetermined direct current on the chroma signal output to the terminal and using it as the discrimination signal, it is possible to favorably discriminate the screen mode even in the device to which the signal from the output terminal is supplied, and it is possible for the user to malfunction. It is possible to eliminate the possibility that a complicated operation such as giving a misunderstanding and manually switching to the full mode is forced.

[0042]

According to the present invention, for example, EDTV-2
Even when the full mode display is being performed by decoding the
It has become possible to superimpose a predetermined direct current on the chroma signal output to the output terminal and use it as a discrimination signal.

As a result, conventionally, the left and right compressed video signals are taken out from the output terminal, which may give the user a misunderstanding that the video signal is out of order, or the user may be forced to perform a complicated operation such as manually switching to the full mode. According to the present invention, it is possible to satisfactorily discriminate the screen mode even in a device to which a signal from the output terminal is supplied, and it is possible to eliminate these fears.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an example of an image receiving device to which the present invention is applied.

FIG. 2 is a diagram for explaining the operation.

FIG. 3 is a diagram for explaining a screen mode.

FIG. 4 is a diagram for explaining a conventional operation.

[Explanation of symbols]

 1 terrestrial antenna 2 U / V tuner 3 microcomputer for channel selection (μ-COM) 4 satellite antenna 5 CS / BS tuner 6 microcomputer for channel selection (μ-COM) 7 switching circuit 8 input terminal 9 Y / C separation filter 10 EDTV-2 decoder 11 video processing circuit 12 video output circuit 13 picture tube (CRT) 14 deflection circuit 15 deflection system 16 audio processing circuit 17 audio output circuit 18 speaker 19 output terminal 20 microcomputer for main control ( μ-COM) 21 Bus line 22 Keyboard 23 Remote receiver 24 Screen mode discrimination circuit 25 Microcomputer for display (μ-COM) 26 Display IC 27 Memory

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kenichi Onuma 6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation

Claims (4)

[Claims] 1. A screen mode switching means for discriminating a size of a screen on which an image in an input video signal is displayed and automatically switching the display size of the video signal according to the discriminated screen size. The image receiving device has an output terminal for a video signal in which at least a luminance signal and a chroma signal are separated, and is output to the output terminal when in a screen mode in which the display size of the video signal is expanded and displayed only left and right. An image receiving device characterized in that a predetermined direct current is superimposed on a chroma signal to be used as a discrimination signal. 2. The image receiving apparatus according to claim 1, wherein the screen mode for expanding and displaying the display size of the video signal only in the left and right includes a wide mode of EDTV. 3. The image receiving device according to claim 1, wherein a predetermined direct current is superimposed on the chroma signal output to the output terminal, and a screen mode identification ID is applied to a predetermined portion of the video signal output to the output terminal. An image receiving device for inserting a signal. 4. The image receiving device according to claim 1, wherein when the input video signal is in a wide mode of an EDTV, a predetermined direct current is superimposed on the chroma signal output to the output terminal, and the output terminal is provided. An image receiving device in which an ID signal for identifying a screen mode is inserted into a predetermined portion of a video signal output to the.