JP3572741B2 - Receiver - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a receiver having a 16: 9 wide aspect display screen, for example.
[0002]
[Prior art]
For example, in a receiver having a 16: 9 wide aspect display screen, for example, when displaying a 4: 3 standard aspect video signal, conventionally, for example, a non-display black band portion is provided at the left and right ends of the display screen. Had formed. However, the display of such a black band portion is unpleasant for viewing and causes various problems such as accelerated deterioration of the phosphor on the display screen at the boundary with the video portion.
[0003]
On the other hand, the applicant of the present application has previously proposed a receiver suitable for use in displaying a video signal of a standard aspect ratio of 4: 3 on a display screen of a 16: 9 wide aspect (Japanese Patent Application No. Hei 5 (1993) -19764). 155569, etc.). According to the invention of the prior application, it is possible to display a 4: 3 standard aspect video signal without generating a black band on a 16: 9 wide aspect display screen.
[0004]
On the other hand, in the above-described 4: 3 standard aspect video signal, a black screen portion is further provided above and below to form a wide-screen image. Therefore, such a video signal can form a wide screen by enlargement. Alternatively, a video signal is formed by compressing the left and right sides of an image, and a wide-screen image is formed by expanding the image left and right.
[0005]
Therefore, when these images are displayed on the 16: 9 wide aspect display screen described above, the black bands provided above and below are discriminated, or the ID signal inserted into the video signal is detected. Thus, a technique for automatically expanding a video signal or performing arbitrary expansion has been developed. According to this, when the original video signal is displayed, the optimum screen mode is always automatically selected and displayed.
[0006]
That is, for example, as shown in FIG. 3B, for the original 4: 3 standard aspect video signal as shown in FIG. 3A, the left and right sides of the display screen are 16: 9 wide aspect display screen. A display such as a zoom mode in which the entire screen is enlarged so as to match the left and right and a full mode in which only the left and right directions of the screen are extended as shown in FIG. 3C can be performed.
[0007]
Also, as shown in FIG. 3D, a wide zoom mode in which the whole is enlarged and then the upper and lower ends are compressed, a subtitle mode in which only the lower side is compressed as shown in FIG. 3E, and further, as shown in FIG. It is possible to select a screen mode such as a normal mode in which the image is displayed as 4: 3.
[0008]
Therefore, these screen modes are further determined as shown in the flowchart of FIG. 4, for example. That is, in FIG. 4, when the process is started, the information of the ID signal inserted into the video signal is taken in step [11], and the discrimination information of the upper and lower black belt portions is taken in step [12]. Further, in step [13], it is determined whether or not automatic switching of screen mode selection is set.
[0009]
When the automatic switching is set in step [13] (Y), in step [14], data for giving an arbitrary distortion to the display screen is formed based on the fetched information described above. ], A new screen mode is displayed, and the process ends. If automatic switching is not set in step [13] (N), the process is terminated as it is.
[0010]
In this way, it is possible to discriminate the above black band portions provided above and below, or to detect the ID signal inserted into the video signal, and automatically select these screen modes. . Such enlargement and expansion of the screen can be performed by, for example, controlling the deflection system of the picture tube in a non-linear manner, or controlling the read / write address of a memory for image processing provided in the video signal system.
[0011]
[Problems to be solved by the invention]
However, in such a device, for example, when a teletext signal in a video signal is demodulated and displayed, if the screen size of the original video signal changes, the change is discriminated and the enlargement of the video signal or The extension is performed automatically. When such enlargement or expansion is performed by the above-described control of the deflection system of the picture tube or the like, the size of the displayed character is changed by this, and it feels obtrusive.
[0012]
Further, even when the display of the video is erased and only the audio is viewed, if the screen size of the original video signal changes, for example, when the display of the video is not completely erased, the video remains. Changes in the display will be annoying. In addition, if the display on the screen indicates that the display has been erased, the size of the display is changed, or the display indicating that it has been discriminated is displayed each time the screen size changes, Become.
[0013]
Furthermore, even when the video signal is absent, the black band portion and the ID signal, which do not exist originally, are erroneously detected due to noise, and the screen size is frequently changed, or a display indicating that the determination is repeated is repeatedly performed. However, there is a fear that the display on the screen becomes extremely obtrusive.
[0014]
On the other hand, an HDTV or so-called MUSE video signal originally has a 16: 9 wide aspect display. Therefore, for such a signal, the above-described processing of determining the screen size and enlarging and expanding the video signal is completely unnecessary. Similarly, these processes are unnecessary for a video signal from a personal computer or the like.
[0015]
The present invention has been made in view of such a point, and a problem to be solved is a conventional screen mode automatic switching means for determining a screen size of a video signal and automatically switching a display size. In such a receiver, there is a case where the screen mode is switched when it is unnecessary, and the display of the screen becomes extremely obstructive.
[0016]
[Means for Solving the Problems]
For this reason, in the present invention, the automatic switching operation by the screen mode switching means is prohibited under predetermined conditions. According to this, unnecessary screen mode switching is prevented, and the screen is switched. Can always be displayed satisfactorily.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
That is, in the present invention, the screen mode switching means for determining the size of the screen on which the image in the input video signal is displayed and automatically switching the display size of the video signal according to the determined screen size is provided. In such a receiver, the automatic switching operation by the screen mode switching means is prohibited under predetermined conditions.
[0018]
Hereinafter, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of an example of a receiver to which the present invention is applied. In FIG. 1, a signal from a terrestrial antenna 1 is supplied to a U / V tuner 2. Also, a signal from a tuning microcomputer (μ-COM) 3 is supplied to the U / V tuner 2 to receive a desired UHF or VHF broadcast signal.
[0019]
Further, a signal from the satellite antenna 4 is supplied to the CS / BS tuner 5. Also, a signal from a tuning microcomputer (μ-COM) 6 is supplied to the CS / BS tuner 2 to receive a broadcast signal from a desired broadcast satellite (BS) or communication satellite (CS). Then, the video signal and the audio signal received by these tuners 2 and 5 and the video signal and the audio signal supplied to the video input terminal 7 are respectively supplied to the switching circuit 8 to select a desired signal. .
[0020]
The video signal selected by the switching circuit 8 is supplied to a Y / C separation filter 9 to be separated into a luminance signal (Y) and a chrominance signal (C), and then supplied to the switching circuit 8 again. When the video signal supplied to the video input terminal 7 is a Y / C separation signal, a signal is selected at a stage subsequent to the Y / C separation filter 9. Then, the Y / C separation signal selected by the switching circuit 8 is supplied to the video processing circuit 10.
[0021]
The luminance signal (Y) selected by the switching circuit 8 is supplied to a teletext decoder 11, and the demodulated text information is supplied to a display IC 12. Then, for example, RGB signals formed by the display IC 12 are supplied to the video processing circuit 10. Also, a signal from an input terminal 13 of a 16: 9 wide aspect video signal such as an HDTV or so-called MUSE video signal and an RGB signal input terminal 14 from a personal computer or the like are supplied to the video processing circuit 10.
[0022]
Then, a signal from the video processing circuit 10 is supplied to a picture tube (CRT) 16 through a video output circuit 15. Further, a synchronization signal from the video output circuit 15 is supplied to the deflection system 18 of the picture tube 16 through the deflection circuit 17. As a result, the picture signal supplied to the tuners 2 and 5, or the terminals 7, 13, and 14 and the character information demodulated by the teletext decoder 11 are displayed on the picture tube 16.
[0023]
Further, the audio signal selected by the above-described switching circuit 8 is supplied to the audio processing circuit 19. A signal whose volume has been adjusted by the audio processing circuit 19 is supplied to a speaker 21 through an audio output circuit 20. Thus, the audio signal supplied to the tuners 2 and 5 or the terminals 7, 13 and 14, and the audio information demodulated by the teletext decoder 11 are emitted from the speaker 21.
[0024]
In this apparatus, a microcomputer (μ-COM) 22 for main control is provided, and a control signal from the microcomputer 22 is transmitted through a bus line 23 to the microcomputers 3 and 6 for tuning. It is supplied to each part. The microcomputer 22 is supplied with operation signals from an arbitrary keyboard 24 and a remote-controlled receiver 25.
[0025]
Further, the video signal and the Y / C separation signal from the switching circuit 8 are supplied to the screen mode determination circuit 26. The screen mode discrimination circuit 26 detects the black bands provided above and below and the ID signal inserted into the video signal, and discriminates the screen mode to be selected. This discrimination information is supplied to the main control microcomputer 22 through the bus line 23.
[0026]
A control signal from the main control microcomputer 22 is supplied to the video processing circuit 10 and the deflection circuit 17 through the bus line 23. As a result, the non-linear control of the deflection system 18 and the control of the write / read address of the image processing memory provided in the video processing circuit 10 are performed, and the screen mode is switched by enlarging or expanding the screen.
[0027]
Further, a display signal accompanying the control from the main control microcomputer 22 is supplied to the display IC 12 through the display microcomputer (μ-COM) 27. As a result, information indicating the content of the control performed by the microcomputer 22, such as a display indicating the switched screen mode, is displayed on the picture tube 16. The memory 28 stores various control information such as the last channel received last time and its screen mode.
[0028]
Further, in this device, the above-described determination of the screen mode is performed as shown in the flowchart of FIG. That is, in FIG. 2, when the process is started, it is determined in step [1] whether or not the input is no signal. If no signal is present (N), in step [2], the display of the text broadcast signal, the display of the video is erased, and only the audio is viewed (deletion mode), or the video signal of the HDTV or MUSE system is 16: It is determined whether the display is any of the nine wide aspect displays.
[0029]
When the display is not such (N), the same processing as that in the flowchart shown in FIG. 4 is further performed. That is, the information of the ID signal inserted into the video signal is fetched in step [11], and the discrimination information of the upper and lower black belt portions is fetched in step [12]. Further, in step [13], it is determined whether or not automatic switching of screen mode selection is set.
[0030]
When the automatic switching is set in step [13] (Y), in step [14], data for giving an arbitrary distortion to the display screen is formed based on the fetched information described above. It is supplied to the video processing circuit 10 and the deflection circuit 17 described above. Further, a new screen mode is displayed in step [15], and the process is terminated. If automatic switching is not set in step [13] (N), the process is terminated as it is.
[0031]
On the other hand, if any of the determinations in the above steps [1] and [2] are YES (Y), the processing in the above steps [11] to [15] is prohibited, and the processing ends as it is. Is done.
[0032]
Therefore, this apparatus has a screen mode switching means for determining the size of the screen on which the image in the input video signal is displayed and automatically switching the display size of the video signal according to the determined screen size. Also in this case, the automatic switching operation by the screen mode switching means can be prohibited under a predetermined condition.
[0033]
Thus, according to the present invention, it is possible to prevent unnecessary screen mode switching from being performed when the screen mode is switched when it is unnecessary and the screen display becomes extremely obtrusive. As a result, the display on the screen can always be satisfactorily performed.
[0034]
That is, in the above-described apparatus, when there is no signal, the display of a text broadcast signal, the display of a video is erased, and only the audio is viewed (deletion mode), or the video signal of the HDTV or MUSE system is 16: In any of the nine wide aspect displays, the automatic switching operation by the screen mode switching means is prohibited.
[0035]
Therefore, in these cases, the size of the displayed character is changed, the size of the screen is frequently changed, or the display indicating that the determination is made is repeated, and the display on the screen becomes extremely obstructive. It is possible to eliminate the fear of becoming.
[0036]
Thus, according to the above-described receiver, the screen mode in which the size of the screen on which the image in the input video signal is displayed is determined, and the display size of the video signal is automatically switched according to the determined screen size. When the switching unit is provided, the automatic switching operation by the screen mode switching unit is prohibited under a predetermined condition, so that unnecessary switching of the screen mode is prevented, and the display of the screen can always be performed satisfactorily. Things.
[0037]
【The invention's effect】
According to the present invention, there is provided a screen mode switching means for determining a size of a screen on which an image in an input video signal is displayed, and automatically switching a display size of the video signal according to the determined size of the screen. Even in the case where the display mode is provided, the automatic switching operation by the screen mode switching means can be prohibited under a predetermined condition.
[0038]
Thus, according to the present invention, it is possible to prevent unnecessary screen mode switching from being performed when the screen mode is switched when it is unnecessary and the screen display becomes extremely obtrusive. Thus, it is possible to always display the screen satisfactorily.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of an example of a receiver 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]
Reference Signs List 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)
Reference Signs List 7 Video input terminal 8 Switching circuit 9 Y / C separation filter 10 Video processing circuit 11 Teletext decoder 12 Display IC
13 Input terminal for HDTV or so-called MUSE video signal 14 Input terminal for RGB signal from personal computer 15 Video output circuit 16 Picture tube (CRT)
17 Deflection Circuit 18 Deflection System 19 Audio Processing Circuit 20 Audio Output Circuit 21 Speaker 22 Microcomputer for Main Control (μ-COM)
23 Bus Line 24 Keyboard 25 Remote Control Receiver 26 Screen Mode Discrimination Circuit 27 Display Microcomputer (μ-COM)

Claims (5)

A video signal processing circuit having a memory in which the video signal is written, and performing enlargement or reduction of an image based on the video signal by writing or reading control of the memory;
Display means for displaying an image based on the video signal from the video signal processing circuit;
Screen mode determining means for determining whether the image is displayed in a mode in which the image is enlarged or enlarged or displayed without being enlarged or reduced ,
And control means for determining whether it is automatically switched set enlargement or reduction of the image according to the determined screen mode by said screen mode determination means,
Demodulation means for forming a video signal from text information obtained by demodulating a teletext signal in the video signal, and outputting the video signal to the video signal processing circuit;
And a control unit for prohibiting an automatic switching operation of automatically switching the display size when the control unit determines that a character based on a video signal from the demodulation unit is displayed . A video signal processing circuit having a memory in which the video signal is written, and performing enlargement or reduction of an image based on the video signal by writing or reading control of the memory;
Display means for displaying an image based on the video signal from the video signal processing circuit;
Screen mode determining means for determining whether the image is displayed in a mode in which the image is enlarged or enlarged or displayed without being enlarged or reduced ,
Wherein the control means prohibits an automatic switching operation of automatically switching the display size when judging that a state that an image displayed by the video signal is erased is displayed. Receiver. A video signal processing circuit having a memory in which the video signal is written, and performing enlargement or reduction of an image based on the video signal by writing or reading control of the memory;
Display means for displaying an image based on the video signal from the video signal processing circuit;
Screen mode determining means for determining whether the image is displayed in a mode in which the image is enlarged or enlarged or displayed without being enlarged or reduced ,
And a control unit for prohibiting an automatic switching operation of automatically switching the display size when the control unit determines that the video signal is no signal . The screen mode determination means determines the screen mode by detecting an ID signal inserted into the video signal or a signal included in the video signal and corresponding to a black band displayed at an end of a display screen. The receiver according to claim 1, wherein: 4. The screen mode discriminating means according to claim 2, wherein the screen mode discriminating means discriminates the screen mode by detecting a signal included in the video signal and corresponding to a black band displayed at an end of a display screen. The receiver as described in the above.

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