JPH0654275A - Television receiver - Google Patents

Abstract

PURPOSE:To obtain an optimum picture output even at the time of reproducing the picture of an external apparatus recorded as a squeeze picture. CONSTITUTION:When a squeeze picture is inputted from the external apparatus like a video tape recorder, a microcomputer 23 for channel selection is controlled to perform the compressing operation by the operation of a compression on/off button provided in a remote controller 21. A MUSE/NTSC down converter and a scanning conversion circuit 9 are switched to the squeeze mode from the microcomputer 23 for channel selection by a control signal based on this control. As the result, the squeeze picture of 525 scanning lines reproduced from the external apparatus has the time base compressed in the vertical direction without conversion of the number of scanning lines, and scanning lines are added to the top and the bottom of the squeeze picture to output a picture signal having 735 scanning lines as the whole.

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 displaying a squeeze mode output of a MUSE / NTSC down converter on a monitor having an aspect ratio of 4: 3.

[0002]

2. Description of the Related Art As a conventional MUSE-NTSC down converter, there is one disclosed in JP-A-2-285897 (H04N11 / 20).

This device inputs a high-definition image signal having an aspect ratio of 16: 9, which is band-compressed by the MUSE system, as shown in FIG. 6A, and displays it on an NTSC display having an aspect ratio of 4: 3 as shown in FIG. 6C. The aspect ratio is 16: 9.

[0004]

However, in such a conventional apparatus, as shown in FIG. 6C, there is a problem that the image portion has only 375 scanning lines and the image quality is poor.

Also, when reproducing an image output from an external device (for example, a video tape recorder), there are the following problems.

That is, when the image recorded on the external device is a squeeze image, the image reproduced from the external device has a problem that the vertically elongated screen is displayed on the display as it is. there were.

The present invention solves such a problem and obtains an optimum image output according to the image output from an external device.

[0008]

The present invention is a television receiver for displaying a squeeze image output from an external device such as a video tape recorder on a monitor having an aspect ratio of 4: 3 at an aspect ratio of 16: 9. Depending on the squeeze image compression means for vertically time-compressing the squeeze image input from the external device into an image having an aspect ratio of 16: 9, and the number of scanning lines of the image generated by the squeeze image compression means. NTSC input from the external device
The scanning line number converting means for converting the number of scanning lines of the image into a predetermined number of scanning lines and the output from the squeeze image compressing means in the first mode for displaying the squeeze image are selected,
A television receiver comprising: selecting means for selecting an output from the scanning line number converting means in a second mode for displaying an SC image.

The present invention is also a television receiver for displaying a squeeze image output from an external device such as a video tape recorder or a MUSE-NTSC down converter on a monitor having an aspect ratio of 4: 3 with an aspect ratio of 16: 9. , Image from the external device or MUSE-NT
First selecting means for selecting an image from the SC down converter, and a squeeze for vertically squeezing the squeeze image input from the external device or the MUSE-NTSC down converter into an image having an aspect ratio of 16: 9. The image compression means and N input from the external device or the MUSE-NTSC down converter according to the number of scanning lines of the image generated by the squeeze image compression means.
The scanning line number converting means for converting the scanning line number of the TSC image into a predetermined scanning line number and the output from the squeeze image compressing means in the first mode for displaying the squeeze image are selected to display the NTSC image. It is a television receiver provided with a 2nd selection means which selects the output from the said scanning line number conversion means in a 2nd mode.

Further, the present invention is a television receiver characterized in that the first selecting means and the second selecting means are controlled by a remote control device (hereinafter abbreviated as a remote controller).

Further, the present invention is a television receiver for displaying an image output from a MUSE / NTSC down converter on a monitor having an aspect ratio of 4: 3 with an aspect ratio of 16: 9, and a squeeze image for switching between a squeeze image and a wide image. / Wide switching means, a microcomputer controlled by the squeeze / wide switching means, and a MUSE / NTSC down converter for outputting a squeeze image or a wide image in response to a control signal from the microcomputer. The output from the MUSE / NTSC converter is made into a squeeze image or a wide image by controlling the microcomputer by means,
The television receiver is characterized in that a squeeze image or a wide image output from a USE / NTSC converter is output from an external output terminal.

[0012]

In the television receiver of the present invention, when it is confirmed that the image from the external device is a squeeze image, the number of scanning lines 525 input from the external device by remote control operation.
The squeeze image of the book is time-axis compressed in the vertical direction without conversion of the number of scanning lines, and then scanning lines are added to the non-image area.
As shown in (3), it operates so as to output an image signal having 735 scanning lines as a whole.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a television receiver of the present invention, FIGS. 2 to 4 are flow charts showing image selection states of the television receiver of the present invention, and FIG. 5 is a scan conversion of the present invention. It is a block diagram showing a circuit.

In FIG. 1, when receiving a normal NTSC broadcast, an NTSC signal is received by an antenna 1 and demodulated into a composite signal by a VIF / SIF processing circuit 3 via a tuner 2.

Next, this composite signal is input to the parent screen color demodulation processing circuit 6 and the parent screen sync separation circuit 7 via the AV input switching circuit 5 which is the first selecting means, and the color difference signal and A sync signal is output. Next, these color difference signals and sync signals are input to the scan conversion circuit 9 via the color difference / sync switching circuit 8. The scan conversion circuit 9 inserts scan lines into 525 normal NTSC scan lines and interpolates into 735 scan lines.

The block configuration of the scan conversion circuit 9 is as shown in FIG.

In FIG. 5, reference numeral 50 denotes a first switch, which constitutes a second selecting means together with a second switch 57 which will be described later. 51 is a squeeze image input terminal, 52 is a squeeze image compression means for vertically compressing the squeeze image signal in the time axis, 53 is a blanking insertion means for adding a scanning line to a non-image portion, 54 is an NTSC signal input terminal, and 55 is NT
SC signal encoder, 56 is a scanning line number converting means, 57 is a second switch, and the second switch 57 is interlocked with the first switch.

In the scan conversion circuit 9, the first switch 50 is switched to the upper side during the squeeze image,
The input signal is vertically image-compressed by the squeeze image compression means 52, and then blanking signals are added to the top and bottom of the squeeze image by the blanking insertion means 53, and the video / chroma / sync signal processing circuit is added via the second switch 57. It is output to 10. Further, at the time of inputting an NTSC image and at the time of wide image (FIG. 6C), the first switch 50 is switched to the lower side, after being decoded by the NTSC decoder 55, the scanning line number converting means 56 interpolates the scanning lines, It is output to the video / chroma / sync signal processing circuit 10 via the second switch 57.

Further, in the video / chroma / synchronization signal processing circuit 10, known video signal processing is performed, and the display 1
The image is displayed from 3. In addition, 11 is a horizontal output circuit, 1
2 is a vertical output circuit. Further, 20 is a switch for selecting a BS signal or a high-definition signal from the MUSE / NTSC down converter.

Separately from this, an input signal (for example, BS signal) is also input to the child screen color demodulation circuit 14 and the child screen sync separation circuit 15 via the AV input switching circuit 5, and the PIP processing circuit. After the PIP processing is performed by 16, it is superimposed on the output signal from the scan conversion circuit 9 described above.

The audio signal is demodulated by the audio demodulation processing circuit 4 and then emitted from the speaker 26 via the audio control circuit 24 via the AV input switching circuit 5 and the audio output circuit 25.

On the other hand, when receiving high-definition broadcasting,
High definition broadcasting is received by the parabolic antenna 17,
MUSE / NTS via second BS converter 18
The frequency is converted by the C converter 19. Where M
The USE / NTSC converter uses a composite signal 4
4 and this composite signal to a color demodulation circuit (MUSE
/ In the NTSC converter), two signals of the color difference signal 45 processed can be output.

Then, the color difference signal from the MUSE / NTSC converter is input to the scan conversion circuit 9, and after the image is compressed, scanning lines are added above and below the image so that the total number becomes 735. By this compression operation, high-definition broadcasting can be viewed on an appropriate screen as shown in FIG. 6D without thinning the scanning lines and deteriorating the image quality.

Since the sub-screen creation process and the scan destination number conversion process are the same as those when a normal NTSC system broadcast is received, the description thereof will be omitted.

The audio signal is demodulated by the audio demodulation processing circuit 4 and then emitted from the speaker 26 via the audio control circuit 24 via the AV input switching circuit 5 and the audio output circuit 25.

As described above, in the scan conversion circuit 9, 525 scan lines are set to 735 during normal NTSC broadcasting.
Interpolation operation is performed to interpolate into a book, and during high-definition broadcasting, horizontal frequency is changed and scanning line compression operation is performed, and then blanking signals are added up and down. Is switched by the tuning microcomputer 23.

Next, the case of reproducing an image from an external device will be described with reference to FIGS.

Reference numeral 21 is a remote controller.
Compression O for switching image compression ON / OFF
An N / OFF button (not shown) is provided. now,
When the compression ON / OFF button of the remote control is pressed to select compression ON, a compression ON control signal is input to the light receiving section 22 provided in the main body of the television receiver, and this control signal causes an external device to transmit the control signal. It is determined that the image is in the squeeze mode (a 4: 3 image obtained by horizontally compressing 525 high-definition signals), the channel selection microcomputer 23 is controlled, and the scanning line compression operation is performed.

On the other hand, when compression OFF is selected by pressing the compression ON / OFF button on the remote controller 21, a control signal for compression OFF is input to the light receiving unit 22, and the image from the external device is displayed in wide mode ( 735 with blanking signals added above and below the 16: 9 image signal
It is determined that the image has a book scanning line), the tuning microcomputer 23 is controlled, and the scanning line interpolation operation is performed.

Further, the channel selection microcomputer 23 is set to issue a compression OFF control signal as an initial operation each time the power switch of the television receiver is turned on.

In the television receiver thus configured, when the power button of the remote controller 21 is pressed, the tuning microcomputer 23 first operates in wide mode.
In this state, when a wide mode image is input from the external device from the AV terminal, the scan conversion circuit 9 interpolates the number of scanning lines of the image input from the external device from 525 to 735 and displays it on the display 13. To be done. On the other hand, when the image from the external device is a squeeze image, the user presses the compression ON / OFF button of the remote controller 21 and inputs a compression ON control signal to the tuning microcomputer 23 to change to the squeeze mode. . Then, the scan conversion circuit 9 operates according to the control signal from the tuning microcomputer 23, the squeeze image is compressed in the scan conversion circuit 9, and then 735 images in which the blanking signals are superimposed vertically are obtained.

Here, when there are a plurality of AV terminals described above, for example, when they have AV1, AV2 and AV3 inputs, the compression ON / OFF button of the remote controller turns compression ON or OFF independently for each input. Can be controlled.

Next, an example having a PIP function will be described with reference to FIGS. 3 and 4.

3 and 4, the case where a reproduced image from an external device (input from the AV1 terminal) is input as a parent screen and a high-definition broadcast is input as a child screen will be described.

Turn on the power switch of the television receiver
Then, when the power button of the remote controller is pressed, the tuning microcomputer 23 first operates in wide mode. Here, when a wide-mode image is input from the external device as the main screen from the AV1 terminal, the scan conversion circuit 9 interpolates the number of scanning lines of the image input from the external device from 525 to 735, and displays it. 13 is displayed.
On the other hand, if the image from the external device is a squeeze image,
The user presses the compression ON / OFF button of the remote controller 21 to change the control mode of the tuning microcomputer 23 to the squeeze mode. Then, the squeeze image is compressed by the tuning microcomputer 23, and then 735 images in which blanking signals are superposed on the top and bottom are obtained.

Next, in the small screen, when a high-definition broadcast is input from the parabolic antenna 17, M is displayed.
A squeeze image is created by the USE / NTSC converter 19, vertical compression is performed by the scan conversion circuit 9, and then blanking signals are added above and below the image to obtain 735 images. Therefore, a 16: 9 high-definition broadcast is displayed on the display 13 on the child screen.

As described above, the compression ON / OFF of the remote controller 21
The OFF control is performed when the power switch of the television receiver is ON or when the power button of the remote control is pressed.
In the initial state, the compression ON of the image is canceled and the compression OFF
Although it starts from the state, the input image from the external device has much more images by the normal NTSC system than images recorded by high-definition broadcasting (for example, squeeze images), so it is better to start with compression OFF. This is because it is used frequently.

Next, squeeze / wide switching means 47
Will be described. The squeeze / wide switching means 47 mainly selects whether the recording to the external device is performed by a squeeze image or a wide image, and is configured by a slide switch or the like.

The squeeze / wide switching means 4
Reference numeral 7 outputs a high level signal when recording a squeeze image and a low level signal when recording a wide image by switching the slide switch, and transmits the signal to the tuning microcomputer 23.

Here, the squeeze / wide switching means 4
If the squeeze mode is selected by 7, the tuning microcomputer 23 outputs a control signal to the MUSE / NTSC converter 19, and the squeeze image shown in FIG. Is output and recorded in an external device. Further, when the wide mode is selected by the squeeze / wide switching means 47, the tuning microcomputer 23 outputs a control signal to the MUSE / NTSC converter 19, and the monitor (recording) output terminal 30 is switched to the wide mode. The wide image shown in FIG. 5C is output and recorded in an external device.

Thus, in the television receiver of the present invention, the desired recording method can be selected by switching the squeeze / wide switching means as the recording method for the external device.

[0043]

According to the present invention, with the above-described configuration, even if an image from an external device is a squeeze image, it can be displayed well on the display. Further, when there are a plurality of AV input terminals, it is possible to independently control the compression ON or OFF of the image for each input terminal, so that it is possible to optimize the compression independently depending on the image from the external device. The image can be selected. Also, since the initial state when the main power of the television receiver is turned on or when the power of the remote control is turned on is set to the compression OFF state, priority is given to the case of recording a normal NTSC signal which is frequently used, so that the user is not required. There is no need to perform the necessary compression ON operation. Further, by providing the squeeze / wide image switching means, the user can record a favorite image of the squeeze image or the wide image on the external device.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a television receiver according to the present invention.

FIG. 2 is a flowchart illustrating a compression operation of the television receiver according to the present invention.

FIG. 3 is a flowchart illustrating a compression operation of a parent screen of the television receiver according to the present invention.

FIG. 4 is a flowchart illustrating a compression operation of a sub-screen of the television receiver according to the present invention.

FIG. 5 is a block diagram of a scan conversion circuit of a television receiver according to the present invention.

FIG. 6 is a diagram illustrating an image compression operation for displaying a high-definition broadcast on a 4: 3 display.

[Explanation of symbols]

 1 Antenna 3 VIF / SIF Processing Circuit 5 AV Input Switching Circuit 9 Scan Conversion Circuit 10 Video / Chroma / Sync Signal Processing Circuit 13 Display 17 Parabolic Antenna 19 MUSE / NTSC Converter 21 Remote Control Transmitter 23 Channel Selection Microcomputer 27 AV1 Input Terminal 28 AV2 input terminal 29 AV3 input terminal 30 Monitor (recording) output terminal 47 Squeeze / wide switching means

Claims (4)

[Claims] 1. A television receiver for displaying a squeeze image output from an external device such as a video tape recorder on a monitor having an aspect ratio of 4: 3 with an aspect ratio of 16: 9, and a squeeze image input from the external device. Image compression means for vertical time-axis compression processing to form an image having an aspect ratio of 16: 9, and NTSC input from the external device according to the number of scanning lines of the image generated by the squeeze image compression means. A scanning line number converting means for converting the number of scanning lines of an image into a predetermined scanning line number; and a first mode for displaying the squeeze image, selecting an output from the squeeze image compressing means and displaying the NTSC image. A television receiver provided with a selecting means for selecting an output from the scanning line number converting means in two modes. 2. A television receiver for displaying a squeeze image output from an external device such as a video tape recorder or a MUSE-NTSC down converter on a monitor having an aspect ratio of 4: 3 at an aspect ratio of 16: 9. And a squeeze image input from the external device or the MUSE-NTSC down converter in the vertical direction by time-axis compression processing and an aspect ratio of 16: 9 squeeze image compression means, and the external device or MUSE-NT depending on the number of scanning lines of the image generated by the squeeze image compression means.
The scanning line number converting means for converting the number of scanning lines of the NTSC image input from the SC down converter into a predetermined number of scanning lines, and the output from the squeeze image compressing means in the first mode for displaying the squeeze image are selected. , A second selection means for selecting an output from the scanning line number conversion means in a second mode for displaying the NTSC image. 3. The television receiver according to claim 1, wherein the first selecting means and the second selecting means are controlled by a remote control device (hereinafter abbreviated as a remote controller). 4. A television receiver for displaying an image output from a MUSE / NTSC down converter on a monitor having an aspect ratio of 4: 3 with an aspect ratio of 16: 9, and a squeeze / wide switching means for switching between a squeeze image and a wide image. And a microcomputer controlled by the squeeze / wide switching means, and a MUS for outputting a squeeze image or a wide image according to a control signal from the microcomputer.
An E / NTSC down converter, and by controlling the microcomputer by the squeeze / wide switching means, the output from the MUSE / NTSC converter becomes a squeeze image or a wide image, and the MUSE / NTSC
A television receiver characterized in that a squeeze image or a wide image output from a converter is output from an external output terminal.