JP4178648B2 - Signal processing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a signal processing apparatus for automatically switching a display mode of a TV screen.
[0002]
[Prior art]
Conventionally, a connection between an Internet terminal and a TV is simply a connection of video / audio signals. When a wide-screen TV with an aspect ratio of 16: 9, which is popular recently, is connected to an Internet terminal, an image from the Internet terminal is displayed in the wide-screen display mode selected at that time.
[0003]
[Problems to be solved by the invention]
For this reason, when the display mode on the wide TV side is the wide display mode or the zoom display mode, the upper and lower and left and right image information is lost, so the original video cannot be displayed entirely on the screen. There was a problem that various information displayed at the edge could not be displayed.
[0004]
There is no problem if the aspect ratio 4: 3 is switched to the display mode on the wide TV side only when displaying images from the Internet terminal, but it is troublesome. Furthermore, when switching from displaying video from an Internet terminal to displaying video on the TV side, switching to the previous display mode again is cumbersome and cumbersome.
[0005]
Accordingly, an object of the present invention is to provide a signal processing apparatus capable of automatically switching the display mode of a TV screen so that the entire screen to be displayed can be displayed.
[0006]
[Means for Solving the Problems]
The invention according to claim 1 is an information acquisition means for acquiring information by computer communication , a signal separation means for separating a vertical synchronization signal, a composite synchronization signal, and a burst flag from a luminance signal, and a first from a vertical synchronization signal. generates a signal to generate a second signal from a composite synchronizing signal, a first signal is generated, the second signal, and a timing signal generating means for generating a timing signal from the burst flag, the aspect ratio information In the case of 16: 9 , based on the generated timing signal, signal superimposing means for superimposing the color subcarrier frequency on the color signal as identification information for a certain period from the fall of the vertical synchronization signal, and information on which the identification information is superimposed and a transmitting means for transmitting to the display means for displaying the, according to the identification information, is a signal processing apparatus for displaying information on the display means
[0007]
When displaying information acquired by an Internet terminal device on a wide TV with an aspect ratio of 16: 9, the wide ID signal is set to a fixed mode with an aspect ratio of 4: 3 and superimposed on the AV signal and transmitted from the Internet terminal device to the wide TV. To do. In the wide TV that has received the AV signal, information transmitted from the Internet terminal device is displayed with an aspect ratio of 4: 3.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an overall configuration of an embodiment to which the present invention is applied. The Internet terminal apparatus 1 is connected to a provider server 3 via a telephone line 2. The Internet terminal device 1 is provided with a built-in modem or Ethernet, and is connected to the server 3 via the telephone line 2 from the built-in modem or Ethernet. The user operates a button on the keyboard 4 or the keypad in order to obtain desired information. A signal from the keyboard 4 is input to the Internet terminal device 1 via infrared rays.
[0009]
The Internet terminal device 1 receives HTML format data and various multimedia data from the server 3 and converts them into images and / or sounds such as still images, characters, sounds, and animations using a decoding function in the terminal device 1. The converted image and / or sound is transmitted via the AV signal line 5 to the TV 6 having an aspect ratio of 4: 3 or the wide TV 7 having an aspect ratio of 16: 9 (hereinafter simply referred to as TV, both the TV 6 and the wide TV 7). Is included).
[0010]
In this embodiment, a wide ID signal is transmitted from an Internet terminal device 1 of a type using a TV as a display screen to a TV as a display device using an AV signal line 5. Specifically, on the Internet terminal device 1 side, when the information acquired on the Internet is displayed by displaying the wide ID signal in a fixed mode of 4: 3 and superimposing it on the AV signal and sending it to the TV side, In this system, the display aspect ratio is 4: 3.
[0011]
In this system, when the TV 6 having an aspect ratio of 4: 3 is connected to the Internet terminal device 1, there is no particular problem, but a wide TV 7 having an aspect ratio of 16: 9 is connected and the display mode on the wide TV 7 side is zoomed. When the display mode is set, the video signal from the Internet terminal device 1 lacks the display of the upper and lower edges as shown in FIG. 2B, and important information is not displayed.
[0012]
In order to prevent this, a wide ID signal to be displayed in the aspect ratio 4: 3 on the wide TV 7 in advance is superimposed on the AV signal and transmitted from the Internet terminal apparatus 1 side. As a result, the normal aspect ratio 4: 3 TV 6 has no effect, and when displayed on a 16: 9 wide TV 7 or HDTV, the aspect ratio 4: 3 is displayed as shown in FIG. 2A. it can. By doing so, it is possible to prevent omission when the video signal from the Internet terminal device 1 is displayed on the wide TV 7. Further, when a normal TV image is selected on the TV side after displaying the video signal from the Internet terminal device 1, the video signal from the Internet terminal device 1 is not supplied to the demodulator in the TV. Therefore, the aspect ratio on the TV side used up to now, that is, the display mode is restored, which is convenient for use.
[0013]
Here, an example of superimposing the wide ID signal is shown in FIG. In this example, a 4.43 MHz signal that is the same as the color subcarrier frequency is used as the wide ID signal. The position where the wide ID signal is superimposed is a part of the VSync signal and is superimposed on the chroma signal. First, a case where a wide ID signal is superimposed will be described.
[0014]
The chroma signal C is supplied from the input terminal 11, the color subcarrier frequency fsc is supplied from the input terminal 12, and the luminance signal Y is supplied from the input terminal 13. The luminance signal Y supplied via the input terminal 13 is input to the VideoSync separator 14. In the VideoSync separator 14, a CompositeSync signal (FIG. 4A), a VSync signal (FIG. 4B), and a burst flag are generated from the input luminance signal Y. The CompositeSync signal and the VSync signal are supplied from the VideoSync separator 14 to the retriggerable multivibrator 15, and the burst flag is supplied from the VideoSync separator 14 to one input of the AND gate 17.
[0015]
In the retriggerable multivibrator 15, a signal A (FIG. 4C) that becomes High for a certain period from the fall of the VSync signal is generated. The wide ID signal is superimposed during the period when the signal A is high. The retriggerable multivibrator 15 generates a signal B (FIG. 4D) that remains High for a certain period from the rising edge of the CompositeSync signal. The wide ID signal is superimposed at a position where the signal B becomes High. Signal A and signal B are input from the retriggerable multivibrator 15 to the input of the AND gate 16, respectively.
[0016]
The AND gate 16 calculates the logical product of the signal A and the signal B. What is necessary is just to superimpose a wide ID signal on the calculation result (FIG. 4E). However, since the color burst is also superimposed on the supplied VSync signal, it is desired to avoid the portion and superimpose the wide ID signal. Therefore, the AND gate 17 calculates the logical product of the operation result of the AND gate 16 and the burst flag from the VideoSync separator 14. The burst flag is a signal that becomes Low only during the period when the color burst is superimposed. The calculation result of the AND gate 17 is a timing signal for superimposing the wide ID signal.
[0017]
The color subcarrier frequency fsc is supplied from the input terminal 12 to one input of the switch circuit 18, and the chroma signal C is supplied from the input terminal 11 to the other input of the switch circuit 18. The switch circuit 18 is controlled by a timing signal from the AND gate 17. The switch circuit 18 is turned on so that the color subcarrier frequency fsc is superimposed as a wide ID signal in the case of a wide-size image with an aspect ratio of 16: 9. In the adder 19, the selected color subcarrier frequency fsc is superimposed on the chroma signal C as a wide ID signal, and a signal as shown in FIG. 5B is generated. The generated signal is output from the output terminal 20.
[0018]
In the case of a video signal from the Internet terminal device 1, the switch circuit 18 is turned off because it is desired to set the TV side to a fixed mode with an aspect ratio of 4: 3. At this time, the chroma signal C has no effect as shown in FIG. 5A.
[0019]
Next, a case where a wide ID signal is detected will be described. Further, the signal generated by the adder 19 is supplied to the band pass filter 21. The band pass filter 21 extracts only the 4.43 MHz band from the supplied signal. In the clamp circuit 22, the signal level of the extracted 4.43 MHz band is kept constant. The envelope detection circuit 23 detects whether or not the supplied signal is at a predetermined level. If it is wide at this point, the VSync signal will be high, and if it is normal, it will be low.
[0020]
In the low-pass filter 24, the low-pass filter is passed through the supplied signal and integrated. In the comparator 25, the signal is always high when the video is wide-sized and the signal is always low when the video is normal. The LED driver 26 drives the LED so as to be turned on when the LED is a wide size image and to be turned off when the image is a normal size image according to the supplied signal.
[0021]
The detection should be made only by confirming the presence or absence of the wide ID signal. However, the burst flag generated by the VideoSync separator 12 is shifted from the actual color burst position in the VSync signal portion. As a result, the wide ID signal could not be superimposed. Therefore, detection was performed using the fact that the level of the wide ID signal is larger than that of the color burst.
[0022]
Thus, in the case of a video on which a wide ID signal is superimposed, the wide ID signal is detected and the LED is turned on.
[0023]
Information on whether the video is wide-size or normal-size is necessary for TV. Therefore, information is transmitted by a method in which the DC voltage of the chroma signal C transmitted from the Internet terminal device 1 to the TV is set to 2.5 V or more for wide-size video. With this method, the complicated detection circuit as described above is not necessary on the monitor side, and can be made very simple with only a comparator.
[0024]
Here, FIG. 6 shows an example in which a DC voltage is used as the wide ID signal superimposed on the AV signal. A resistor 41 is inserted between the terminal 40 and the base of the transistor 43. From this terminal 40, a timing signal as to whether or not a DC voltage is superimposed on the AV signal is supplied. A resistor 42 is inserted between the emitter and base of the transistor 43. The emitter of the transistor 43 is supplied with +5 V, and resistors 44 and 45 are inserted in series between its collector and ground. A connection point between the resistors 44 and 45 is connected to the S terminal 48. Resistors 46 and 47 are inserted in series between + 5V and ground. The connection point between the resistors 46 and 47 is connected to the collector of the transistor 43 and also to the S terminal 49. The S terminal 48 is an S video line output, and the S terminal 49 is an S video monitor output.
[0025]
Next, FIG. 7 shows a circuit diagram of an example of the receiving side provided in the TV. A resistor 51 is inserted between the power supply VCC and the collector of the transistor 55. A resistor 52 is inserted between the power supply VCC and the anode of the light emitting diode 53. The cathode of the light emitting diode 53 and the collector of the transistor 55 are connected. A resistor 56 is inserted between the base and emitter of the transistor 55, and a resistor 54 is inserted between the base and the S terminal 57. The emitter of the transistor 55 is grounded. A resistor 59 is inserted between the S terminal 57 and the ground. A capacitor 58 and a resistor 60 are inserted in series between the S terminal 57 and the ground so as to be in parallel with the resistor 59.
[0026]
In addition, high-definition broadcasting uses a wide TV that is 1.33 times longer than the current TV. If this wide TV spreads widely, software compatible with wide TV will appear even in the current VTR. Then, the VTR or TV needs information on whether the video to be played is a wide-size video with an aspect ratio of 16: 9 or a standard-size video with an aspect ratio of 4: 3. This information may be input by the user each time. However, since this is inconvenient, the wide ID signal is superimposed on the wide-size video software, and the wide ID signal superimposed upon reproduction is detected to obtain a wide-size video. Or whether it is a standard size video.
[0027]
In this embodiment, when the wide ID signal is not superimposed, the information acquired by the Internet terminal device can be completely displayed on the wide TV by setting the display screen of the wide TV to the aspect ratio 4: 3. it can.
[0028]
【The invention's effect】
According to the present invention, when displaying a video signal from an Internet terminal device on a TV displayed in a conventional wide display mode or zoom display mode, it is possible to prevent missing of the left, right, top and bottom images.
[0029]
According to the present invention, it is possible to automatically change the aspect ratio when the TV image is viewed and the aspect ratio when the video signal from the Internet terminal device is displayed.
[Brief description of the drawings]
FIG. 1 is a block diagram of an embodiment of a system to which the present invention is applied.
FIG. 2 is a schematic diagram for explaining screen display according to the present invention;
FIG. 3 is a block diagram showing an example of superimposing a wide ID according to the present invention.
FIG. 4 is a timing chart of an example when superposing a wide ID according to the present invention.
FIG. 5 is a schematic diagram of an example in which a wide ID signal of the present invention is superimposed.
FIG. 6 is a circuit diagram showing an example of superimposing a wide ID according to the present invention.
FIG. 7 is a circuit diagram showing an example of detecting a wide ID according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Internet terminal device, 2 ... Telephone line, 3 ... Server, 4 ... Keyboard, 5 ... AV signal line, 6 ... TV, 7 ... Wide TV

Claims (1)

Information acquisition means for acquiring information by computer communication;
Signal separation means for separating the vertical synchronization signal, the composite synchronization signal, and the burst flag from the luminance signal;
A first signal is generated from the vertical synchronization signal, a second signal is generated from the composite synchronization signal, and a timing signal is generated from the generated first signal, the second signal, and the burst flag. Timing signal generating means for performing,
When the aspect ratio of the information is 16: 9 , signal superimposing means for superimposing the color subcarrier frequency on the color signal as identification information for a certain period from the falling edge of the vertical synchronization signal based on the generated timing signal ; ,
Transmitting means for transmitting to the display means to display the information on which the identification information is superimposed,
According to the above identification information, a signal processing device for displaying the information on the display means.

Images