MXPA98002155A - Decoder and decoding method - Google Patents

Abstract

A plurality of simultaneously inputted signals are successively sent to an additional information decoding means by switching a switching means at prescribed timing, and additional information contained in each input signal is detected and decoded. Thus, a plurality of pictures corresponding to the additional information are generated from the input signals and displayed on the same screen.

Description

rnrpnnt tt (-'- innD v MTTF r «rw nt (- nt trt ar, triK ' The present invention relates to a decoder and a decoding method and more particularly, preferably it is applicable to a decoder and a decoding method for an image receiver to display a plurality of screens on the same screen.

BACKGROUND OF THE INVENTION For example, in the case of a television receiver 1 as shown in FIG. 1, in the first video signal Sl and a first audio signal SIO, which are selected by a tuner 3, a signal of television received by an antenna 2 and a second video signal S2 and a second audio signal S20 of a video signal transmitted through an EX terminal coming from the second input source of a VTR, or the like, respectively are transmitted to a switch SWl. Switch SW1 selects an input signal on the side of the first video signal Sl and the first audio signal SIO or the second video signal S2 and the second audio signal S20 as a main video signal, in accordance with the control of a microprocessor 5 and sends it to a video processor 6 and to the microprocessor 5.

The video processor 6 separates a horizontal synchronizing signal SH and a vertical synchronizing signal SV from the main video signal SA, then, transmits the signal from the main video SA to a TRC7 and transmits the horizontal synchronizing signal SH and the vertical synchronizing signal SV to the microprocessor 5 and a diverter circuit 8 for driving the TRC7. In the present, the microprocessor 5 decodes a closed header data while a header signal is added to the main video signal SA by means of a vision decoder of the header 9. In addition, an XDS signal (extended data service: EDS) ) added to the main video signal SA is decoded by the decoder of the heading vision 9. The XDS signal is a packet signal transferred to be interleaved in the space of a closed header data by which different data, such as time Start, content or similar, in relation to the program, can be transferred. 'In this way, we have investigated the control of the screen presentation for a TV transmission program that is undesirable to be observed by the minors' who use this XDS signal. A transmitting station previously evaluates the advisable age for the viewer about the content of each program and transmits a code according to the age of the observer (classification) as an XDS signal. On the other hand, an observer's age level is established on the receiver's side and compared with the transmitted code. And only when a prescribed condition is satisfied, the transmission program can be shown on the screen. The microprocessor 5 compares the classification established by the user with the classification established and transmitted by the transmitting station and controls the presentation of a program based on the result of this comparison. The "classification" in the present essentially means an evaluation of a step to decide if the content of the expression, such as extremely violent scenes in a movie, should be controlled so that they are not observed by the minor. A regulation, such as the age limit, has been established when a film appears on the screen based on the classification. In the case where the user establishes the classification at his desired level, the vision decoder of the header 9 on the microprocessor 5 first decodes the XDS signal and compares the stage set by the user. As a result of this comparison, if the prescribed condition is not satisfied, a control signal YS is generated to control the display and is sent to the video processor 6. The header vision decoder 9 also transmits a closed header signal SA2 obtained by converting the closed header data of the main video signal SA into a video signal. At this time, the video processor 6 converts the main video signal SA into the signals of 3 primary colors R, V and A (RGB) and performs on / off control of the presentation of a main image on the screen, based on the controller signal YS. On the other hand, the above television receiver 1 is provided only with a header vision decoder 9, in this way, for example, in a television receiver having an image-in-picture function for display video signals, from more than two input sources, on the same screen, such as the picture-in-picture screen (main screen, sub-screen) and a multi-image function to display images in a linear form of a plurality of channels, the closed header data or the XDS data only for the main video signal SA can be decoded, but the closed header data or the XDS data for a sub image can not be decoded.

Therefore, for example, even if the user establishes a classification for a transmission program, the control of the screen presentation has only been effective for the main image and the control has not been undesirably imposed on the sub image whose XDS data does not they are decoded, and in this way, the sub image has been disadvantageously displayed. To solve this problem, for example, a method has been considered in which two heading vision decoders are provided for decoding respectively the closed header data and the XDS data for the main video signal SA and the sub video signal SB. However, in this case undesirably a very high cost is required.

DESCRIPTION OF THE INVENTION The present invention has been made considering the previous points and proposes a decoder having a simple structure and a decoding method in which a plurality of input signals are shown on the same screen and the sample of the signals of Input on the screen can be controlled individually, depending on the additional information of each input signal. To solve the above problems, the present invention consists in a decoder that provides the means for displaying the image to form a plurality of images corresponding to each input signal from a plurality of input signals having additional information, and displaying them in the same screen; the switching means for sequentially switching and entering the plurality of input signals at the prescribed switching time; the means for decoding the additional information for detecting and decoding additional information included in each input signal from each of the plurality of input signals that are sequentially input through the switching means; and the means for controlling the presentation to individually control the presentation of the plurality of images, according to the plurality of additional information corresponding to the plurality of the input signals. When a plurality of images are formed from a plurality of input signals provided at the same time and displayed on the same screen, the plurality of input signals are transmitted sequentially to the decoding means of the additional information by switching the switching means on. a prescribed time, and additional information included in each input signal is detected and decoded from the plurality of input signals. In this way, the presentation of each image corresponding to the additional information can be individually controlled based on the plurality of additional information. Brief description of the drawings. Figure 1 is a block diagram showing the entire structure of a traditional television receiver. Figure 2 is a block diagram showing the entire structure of a television receiver according to the present invention. Figures 3A to 3D are schematic diagrams showing an example of the presentation of the image. Figure 4 is a schematic view showing the structure of a YUV switch. Figure 5 is a block diagram showing the complete structure of a television receiver according to another embodiment. Figures 6A to 6D are schematic views showing examples of the presentation of the image according to another embodiment. Best way to carry out the invention. In connection with the drawings, a mode of the present invention will now be described in detail. Referring to Figure 2 in which the same reference numerals are added to corresponding parts of Figure 1, lu generally designates a television receiver. When a television signal received by an antenna 2 is transmitted to a tuner 3, a desired transmission station is selected in accordance with an SCI controller signal transmitted from a microprocessor 5 based on the control of a remote controller 11 by a remote controller 11. user and a first video signal Sl and a first audio signal SIO are transmitted to a switch SWl. In a similar way, a second video signal S2 and a second audio signal S20 inputted from an external terminal EX of a second input source, such as a VTR, are transmitted to the switch SW1. The switch SW1 selects the input signal via the tuner 3 or the input signal via the VTR, according to the control of the microprocessor 5 through an internal control bus or CB collector. The audio signal selected by the switch SWl, whose low tone, high tone, right and left balance, ambient effects and sound volume or the like are adjusted under the control of the output of the SC10 controller signal through the internal control bus CB of the microprocessor 5 through a sound processor 12, is amplified in the sound by an amplifier circuit 13 and the amplified sound signal leaves a speaker 14. In the meantime, the microprocessor 5 controls the switch SWl through the bus CB internal control based on an operation by the user's remote controller 11, selects an input signal of the first video signal Sl or the second video signal S2 as a main video signal SA and transmits it to a video processor 6 and transmits an input signal of the first video signal Sl or the second video signal S2 as a signal of sub SB to a picture-in-picture processor 17 by a muffler of 16. The output of the main video signal SA and the sub video signal SB coming from the switch SWl, branch simultaneously and also exit to the switch SW2. While the main video signal is input to the video processor 6 via the switch SW1, the sub video signal SB is input to the video processor 6 by a character generator 18 from the image-in-picture processor 17. The video processor separates a synchronizing signal containing a horizontal synchronizing signal SH and a vertical synchronizing signal SV from the main video signal SA, and then transmits respectively the main video signal SA and the synchronizing signals to a TRC7 and a diverter circuit 8. , the RGB signals which are output signals of the video processor 6 are synchronized with the horizontal synchronizing signal SH and the vertical synchronizing signal SV, the synchronized signals are scanned by the diverter circuit 8 and shown on the display of the TRC7. At this time the quality of an image displayed on the TRC7 is adjusted by controlling the video processor 6 via the internal control bus CB of the microprocessor 5. The video processor 6 also transmits respectively the horizontal synchronizing signal SH and the vertical synchronizing signal SV to the microprocessor 5 and to the picture-in-picture processor 17. The picture-to-picture processor 17 sends a sub-picture containing Y, U and V signals of the sub video signal SB to the video processor 6 by the character generator 18 according to a result of the control signal SC10 by the internal control bus CB the microprocessor 5. The sub image is inserted in a part of the main image of the video processor 6. The RGB signals which are the output signals of the video processor 6 are synchronized with the horizontal synchronizing signal SH and the vertical synchronizing signal SV and scanned by the diverter circuit 8 so that s e show an image obtained on the TRC7 screen. As a result, as shown in FIG. 3A, a sub image P2 smaller than a main image Pl is inserted in a part of the main image Pl in the display screen of the TRC7. In addition, the video processor 6 synchronizes the vision of the heading of a main screen with the horizontal synchronizing signal SH and the vertical synchronizing signal SV based on the microprocessor control signal YS, so that an image obtained in the desired position is displayed of the TRC7 screen. In the same way, the character generator 18 is designed to insert the heading view of a sub image in the desired position of the sub image depending on the output of the controlling signal SC10 through the internal control bus CB of the microprocessor. The output signal of the character generator 18 in which the header view or character of the sub image is inserted, such as a channel number or the like, is sent to the video processor 6. By means of which, as shown in Figure 3A, a channel number being selected as sub image P2 is shown in sub image P2 as a character of channel number Pc¿. In addition, the character generator 18 shows a channel number of the main image Pl currently selected as a character of the channel number P_ in a part of the main image Pl by the controlling signal SC10 from the microprocessor 5. The microprocessor 5 switches the switch SW2 by means of a control signal SCI5 for the switched control that is generated by a generating part of the control signal 19 and in an alternative way transmits the main video signal SA and the sub video signal SB to a decoder of header vision 9. That is, the microprocessor 5 generates the control signal SC15 to switch the switch SW2 when the horizontal synchronizing signal SH of the main video signal SA selected by the switch SW2 reaches the line 21 of the scanner lines (21 lines) after the detection of the vertical synchronizing signal SV, and switches the SW2 towards the signal side d e sub video SB. The microprocessor 5 controls to generate again the control signal SC15 from the generating part of the control signal 19 when the horizontal synchronizing signal SH of the sub video signal SB switched from the main video signal SA reaches the line 21 counting from a position in which the vertical synchronizing signal SV is detected and switches the switch SW to the side of the main video signal SA. The microprocessor 5 repeats the aforementioned switching control in relation to the switch SW2. During this time, the microprocessor 5 respectively detects and decodes the data to control the on-screen display that is set for XDS signals SX1 and SX2 respectively transmitted on line 21 of the fields 2 of the main video signal SA and the sun signal. SB video from the main video signal SA and the sub video signal SB which are switched and alternately introduced by the generating part of the control signal 19 to the decoder of the vision of the heading 9. The XDS data is a data formed in a packet on line 21 of field 2 of a television signal and provides a data service as the additional information of the video signal. The decoder of the vision of the heading 9 respectively decodes the XDS signals SXl and SX2 added to the main video signal SA and the sub video signal SB to detect a control data of the presentation of the image added to the XDS signals SXl and SX2. By this means, a previously established classification for a main image and a sub image on the transmitting side is dictated. In the present, the microprocessor 5 respectively compares the result of the dicrimination of the classification, for the main image and the sub-image by the decoder of the vision of heading 9, with the data of the classification previously established by the user in the microprocessor 5 of the receiver side. Then, the microprocessor 5 generates the control signals SC20 and SC21 to control the presentation of the main image and the sub image on the screen based on the result of the comparison and transmits them respectively to an image mute 16 and an OR circuit 21. The image muffler 16 has a function to set the SB sub video signal transmitted from the switcher SWl to the picture processor in picture 6 on a black level and is controlled to turn on / off by the control signal SC20 output of the microprocessor 5. The OR circuit 21 transmits the logical OR of a synchronizer showing the main image on the screen controlled by the control signal SC21 transmitted from the microprocessor 5 and a synchronizer for displaying the sub image on the screen transmitted from the image-in-picture processor 6 as an SC22 control signal, to switch SW10 YUV of video processor 6 shown in figure 2. Switch SW10 YUV switches the main video signal SA and the sub video signal SB depending on the control signal SC22 and sends them to the TRC7 . In this case, first, to block only the presentation of the main image, the control signal SC21, to establish a turn-off output by setting the video signal of the main picture at the black level by means of the microprocessor 5, is transmitted to the OR circuit 21. As a result, as shown in Figure 3B, the switch SW10 YUV is set to stay switched to the side of the sub image during the control period of the presentation of the main image on the screen, and the presentation of a part of the presentation of the main image Pl is controlled in black and only one image A portion of the sub image P2 is projected on the TRC 7. At this time, the microprocessor 5 sends the control signal SC10 to the sound processor 12 to control a sound output of a speaker 14 corresponding to the main image Pl in a normal state where the presentation is not controlled in a state of interruption of the output according to the presentation control of the main image Pl. At this time, a sound of the sub image P2 may be sent instead of the sound of the main image Pl (however, only when the presentation of the sub image is not controlled). In addition, when the presentation of the main image Pl is controlled in black, the character generator 18 shows a presentation character of the PC classification! in a part of the main image Pl shown in the TRC7 by the control signal SC10 provided from the microprocessor 5, so that the display which is controlled in the main image Pl can be perceived by the observer. In this regard, also when the presentation of the main image Pl is controlled, the character generator 18 shows the presentation character of the Pei channel in the main image Pl by the control signal SC10 provided from the microprocessor 5. By means of which , even in the state where the main image Pl does not appear to be controlled at the black level, the channel number of the main image Pl that is selected at that moment can be informed to the observer. Furthermore, when only the sub-image display is blocked, the image muffler is turned on by means of the output of the control signal SC20 to deactivate the image 16 from the microprocessor 5, and the sub-video signal SB transmitted to the processor image in image 6 is set at the black level. At this time, the main video signal SA or the sub video signal SB is transmitted to the TRC7 commuted by the control signal SC22. As a result, as shown in Figure 3C, the main image Pl by the main video signal SA is displayed on the display screen of the TRC7 with the sub image P2 controlled at the black level by the image mute 16 shown in a part of the main image Pl. At this time, the character generator 18 shows a display character of the classification PC4 in a part of the sub image P2 controlled at the black level by the control signal SC10 sent from the microprocessor 5, so that the presentation of the sub P2 image is controlled to be perceived by the observer. Along with this, also when the presentation of the sub image P2 is controlled, the character generator 18 shows the presentation character of the channel PC2 in the sub image P2 by the controlling signal SC10 provided from the microprocessor 5, so that even in the state in which the sub image P2 does not appear because it is controlled in the black level, the channel number of the selected sub image can be informed to the observer. In addition, when the display of the main image and of the sub image on the screen is blocked, the control signal SC21 to set the output of the main image off is sent from the microprocessor 5 to the OR 21 circuit, and the SC20 control signal to set the image mute on it goes out from the microprocessor 5 to the image muffler 16. As a result, the SW10 YUV switch is set to stay switched to the sub-image side during the control period of the main image display and the sub image on the screen, and the SB sub video signal is set to the black level , so that, as shown in Figure 3D, both the main image Pl and the sub image P2 are blocked and are not sent to the TRC7. At this time, the microprocessor 5 sends the control signal SC10 to the audio processor 12 to control the sound that is sent from the speaker 14 which corresponds to the main image Pl in the normal state, where the presentation is not controlled, in an output that interrupts the state in accordance with the presentation control of the main image Pl. Also, when both presentations, the main image Pl and the sub image P2, are controlled in black, the character generator 18 respectively shows the character presentation of the classification PCj, Pc4 in a part of the main image Pl and a part of the sub image P2 controlled in the black level, so that the public can perceive what is controlled in the presentations of the main image Pl and the sub image P2. In this context also, when both presentations of the main image Pl and the sub image P2 are controlled, the character generator shows the presentation character of the channel P? in the main image Pl by the control signal SC10 provided from the microprocessor 5, while displaying the channel display character PC2 in the sub image P2. By this means, even in the state where the main image Pl and the sub image P2 can not be seen because they are controlled on the black level, each channel number of the main image and the sub image selected in that they can be informed to the observer. In addition, when the main image and the sub image are displayed, the control signal SC21 to set the output of the main image on is sent to the circuit 0R21 from the microprocessor 5. At this time, the image mute 16 is simultaneously set to off by the output of the control signal SC20 of the microprocessor 5. In this case, the switch SW10 YUV is switched synchronizing with the respective timing to tune the output of the main image and the sub image based on the synchronizing signal horizontal SH and the vertical synchronizing signal SV of the main image, during a period to show the main image and the sub image on the screen. Consequently, as shown in Figure 3A, the main image Pl and the sub image P2 both appear on the same screen of the TRC7. Incidentally, as the methods of canceling control of the presentation on the receiver side, it can be considered that the user enters a code number in the microprocessor 5 or re-establishes an age of the observer of the classification with the opening of a screen of menu or similar. In addition, the microprocessor 5 transmits the header vision signal SA2 of the decoded main image by a closed header signal from the header vision decoder 9 to the video processor 6. At this time the microprocessor 5 transmits at the same time a control signal YS for controlling whether the header vision is displayed or not in the video processor 6. Further, the microprocessor 5 controls whether the header vision of the sub image is displayed or not, according to a header vision signal SB2 decoded the closed header data of the sub image by outputting the control signal SC10 via the internal control bus CB for the character generator 18. Moreover, the microprocessor 5 controls a position to present the vision of header of the sub image by outputting the control signal SC10 to the character generator 18 through is from the internal control bus CB. The character generator 18 controls the position to present the heading view by synchronizing the horizontal synchronizing signal SH and the vertical synchronizing signal SV transmitted from the video processor 6 with the vision signal heading SB2, based on the control signal SC10, and forms the header view of the sub image screen based on the header vision signal SB2. When the television signal and the video signal respectively are input through the tuner 3 and the EX terminal in the structure described above, these are respectively selected as the main video signal SA and the sub video signal SB in the switch SWl. . The main video signal SA is transmitted to the video processor 6. The sub video signal SB is transmitted to the image-in-picture processor 17. At this time, the main video signal SA and the sub video signal SB are also simultaneously branched transmitted to switch SW2. In the switch SW2, the main video signal SA and the sub video signal SB are switched in alternation with the control of the microprocessor 5 and transmitted to the header vision decoder 9. At this time, the microprocessor 5 counts the synchronizing signals horizontals SH in the main video signal SA and the sub video signal SB and switches and »controls the switch SW2 at a time for every 21 lines counting from the vertical synchronizing signal SV in each field 2. Therefore, when the switch SW2 selects the main video signal SA, the microprocessor 5, after detecting the vertical synchronizing signal SV of the main video signal SA, counts the horizontal synchronizing signal SH for 21 lines counting from the vertical synchronizing signal SV until reaching the signals of main video SA line 21 for the header vision decoder 9. In this way the XDS SXl signal adds The line 21 of the field 2 in the main video signal SA is searched for the header vision decoder 9. After counting 21 lines of the main video signal SA, the microprocessor 5 switches the switch SW2 to search for the signal of sub video SB for the header vision decoder 9. Then, the microprocessor 5, after detecting the vertical synchronizing signal SV of the sub video signal SB, counts the horizontal synchronizing signals SH for 21 lines from the synchronizing signal vertical SV to search for the sub video signal SB up to line 21 for the header vision decoder 9. From this channel, the XDS SX2 signal added to line 21 of field 2 in the main sub video signal SB [sic] for the header vision decoder 9. The header vision decoder 9 respectively and alternately decodes the XDS signals of SXl and SX2 respectively. on the main video signal SA and the sub video signal SB on the line 21, so that a display control of each screen of the main video signal SA and the sub video signal SB is discriminated. In this way, each screen display control data respectively set to two video signals selected through the switch SW1 (the main video signal SA and the sub video signal SB) is repeatedly discriminated alternately in a network decoder. Header vision 9. In this sense, the screen display control data added to each XDS signal XS1, SX2 of the main video signal SA, the sub video signal SB is set according to the content of the signal. image. Therefore, if the level of each display control data discriminated in the header vision decoder 9 is higher than the level previously established by the user and corresponds to the age of the observer, this represents that the image corresponding to the data On-screen display control is undesirable for the observer younger than the age set by the user. In this case, the microprocessor 5 controls the presentation of the image with the on-screen display control data added to it. In the case where the image to be controlled in your presentation is a main image, the microprocessor 5 connmutates the switch SW10 YUV in the video processor 6 on one side of the sub video to, in a forced way, control the presentation of the part where the main image is presented in black. This control of presentation of the main image continues until the level of the presentation control data added to the main video signal SA is the same or lower than the level corresponding to the age of the observer previously established by the user in the microprocessor. Furthermore, in the case where the image to be controlled in its presentation is a sub image, the microprocessor 5 controls, in a forced manner, the presentation of the sub video, in black by means of the image silencer 16. This presentation control of the sub image continues until the level of the presentation control data added to the sub video signal SB is the same or lower than the level corresponding to the age of the observer previously established by the user in the microprocessor 5. According to the structure already mentioned, since the main video signal SA and the sub video signal SB, which come from the two input sources, are respectively defined by the switch SW2 and alternatively transmitted to the header vision decoder 9, the XDS signal SXl recorded in the main video signal SA as additional information, and the signal XDS SX2 recorded in the sub video signal SB as additional information, are detected and decoded. Thus, the classifications concerning the control of the on-screen display that are respectively set for the XDS signals SXl and SX2 can be decoded individually by the header vision decoder 9 with an input. In addition, the on-screen display control corresponding to each SA and SB video signal can be made in the main image and the sub-image to be displayed on the same screen of the TRC7 by the microprocessor 5. In addition, given that the heading data closed respectively added to the main video signal SA and the sub video signal SB, which are the input from the two input sources, are switched through the switch SW2, alternatively sent to the header vision decoder 9 with an input, and decoded in the main image and the sub image to be displayed on the same screen, the header view data can be displayed individually. Although the above-described embodiment has dealt with the case of the presentation of a plurality of images using the video signal input from the tuner 3 and the external terminal, however, the present invention is not only limited to this but also, as shows in figure 5 in which the same reference numbers are added to parts corresponding to those of figure 2, providing a second tuner 4 in addition to the first tuner 3, two video signals can be selected between the two tuners 3, 4 and the external terminal EX by the switch SWl to respectively transmit these signals to the video processor 6 and the image mute 16 as the main video signal SA and the sub video signal SB. In this case, a TV transmission selected by the second tuner 4 is transmitted from a transmitting station different from the TV transmission selected by the first tuner 3. In this way, if a third S3 video signal and a third audio signal S30 selected by the second tuner 4 are transmitted to the switch SW1 and the desired video signal is selected in the SW1 switch, it is possible to select a channel of the other TV station that can not be selected by the first tuner 3. In this arrangement , since the main video signal SA and the sub video signal SB can be selected between the video signals sent from two channels in the air and the external terminal EX, the control of the presentation on the screen and the presentation of the vision of header can be individually performed based on the main video signal SA and the sub video signal SB that are selected. further, the above-described embodiment deals with the presentation case of the sub image P2 smaller than the main image Pl in a part of the main image Pl on the display screen of the TRC7. However, the present invention is not only limited to this but also, as shown in Figure 6A, the present invention can be applied to the case of linearly presenting the main image Pl and the sub image P2 in the presentation regions having almost the same size. In addition, the above-described modality deals with the case of the presentation of two images (the main image Pl and the sub image P2) on the presentation screen of the TRC7. however, the present invention is not limited to this but also as shown in Figure 6B, the present invention can be applied to the case of presenting more than 3 images P1-P7 on a display screen of the TRC7. In this case, by providing a switch for switching a plurality of more than 3 inputs, instead of the switch SW2 for switching two inputs mentioned in the above, in FIG. 2, the on-screen display control can be performed individually for each of them. the plurality of more than 3 images.

Furthermore, the above-described modality deals with the case of presenting the characters of the channel number PC? and Rc in the main image Pl and / or the sub image P2 by the character generator 18. However, the present invention is not only limited to this but also, as shown in figure 6C, a station logo. transmitter, transmitted in the form of the respective XDS signals in the main image Pl and the sub image P2, may be presented as the character (s) P ^ and / or PClJ di logo of the transmitting station. By means of which, the observer can realize the transmitting station that is being transmitted in each image. In this sense, Figure 6B shows the state where the presentation of each image is controlled when the main image Pl and the sub image P2 are presented in linear form. Also in this case, given that the presentation characters of the classification P, - or P, -4 and the characters of the logo of the transmitting station Pc_, or PC6 are presented, the observer can perceive that the presentations of the images Pl , P2 are respectively controlled, and can also confirm the transmitting stations of the images Pl and P2, of which the content can not be confirmed because they are in the process of controlling the presentation. The data service that uses the XDS signal can be applied to the information that includes: 1) different information related to a program, such as start time, duration, content of a program currently transmitted, 2) different related information with a program, such as start time, duration, content of a program that will be presented in the future, 3) information related to a transmitting station that is transmitting, 4) weather information, 5) information of the weather or accidents or similar, and can be applied to the case in which this information is all decoded. In addition, the above-described embodiment deals with the case where a synchronizer is used, when 21 horizontal synchronizing signals are counted after the vertical synchronizing signal is detected, as a switching time for switching the switch SW2. However, the present invention is not only limited to this but also to the switch SW2 that each field can be switched by the vertical synchronizing signal. Additionally, the count number of the horizontal synchronizing signals may be set for a source other than 21, in accordance with the additional position of the transmitted XDS signal together with the account number in the horizontal synchronizing signal. Furthermore, the switch SW2 can be switched and controlled at higher speed by a clock of, for example, 10 and several megahertz, the main video signal SA and the sub video signal SB can be respectively read alternately, transmitted to the microprocessor 5 and respectively stored in a RAM (random access memory) for the main video signal SA and a RAM for the sub video signal SB, and then, the XDS signals added thereto can respectively be sampled and decoded by the decoder of view of the header 9. Moreover, by the respective storage of the 21 lines of the horizontal synchronizing signals of the main image and the sub image in a temporary memory of the main image and a temporary memory of the sub image, these can be read from each temporary memory at a speed higher than its writing speed, they can be sent to the microprocessor 5 and introduced to the header vision encoder 9 on the microprocessor 5.

Industrial Applicability In a television receiver, the present invention can be applied to the case of linearly presented images of a plurality of channels on the same display screen.

Claims (16)

1. CLAIMS A decoder containing: the means of presenting an image to form a plurality of images corresponding to each of the input signals, coming from a plurality of input signals, which have additional information and display them on the same screen; the switching means for switching and sequentially sending the plurality of input signals at the prescribed switching time; the additional information decoding means for detecting and decoding the additional information included in each of the input signals from each of the plurality of input signals that are sequentially input by the switching means; and the display control means for individually controlling the display of the plurality of images according to the plurality of additional information corresponding to the plurality of the input signals. The decoder, according to claim 1, wherein; each of the plurality of input signals is a television signal formed by a video signal and an audio signal. The decoder, according to claim 2 further includes; the means for establishing the switching time for detecting the vertical synchronizing signal of the television signal, and then counting the fixed number of horizontal synchronizing signals to establish the switching time of the switching means. The decoder, according to claim 2 further includes; the separating means for separating the respective audio signals from the plurality of television signals, the decoder wherein; the display control means respectively controls the outputs of the audio signal depending on the additional information corresponding thereto. The decoder, according to claim 1, wherein; each additional information added to each of the plurality of input signals is control data of the presentation in which the evaluation of the step is established to control the presentation of each of the plurality of images corresponding to one of the plurality of Entrance signs The decoder, according to claim 5, wherein; the means of control of the presentation to compare respectively the data of the step previously established by the user with each control data of presentation of the plurality of additional information to individually control the presentation of the plurality of images corresponding to the plurality of signals of entry respectively. The decoder, according to claim 6, wherein; when the control data of the presentation of the additional information satisfies a prescribed condition against the data of the step previously established by the user, the presentation control means limits the presentation of the corresponding image to the additional information that satisfies the condition. The decoder according to claim 7, wherein: the step data previously established by the user is the data based on an upper limit for the audible age; the presentation control data of each of the plurality of additional information is a data based on the youngest age whose visualization of the corresponding image is allowed; if each control data of presentation of the plurality of additional information exceeds the data of the step established by the user, the presentation control means controls the presentation of the corresponding image to it. The decoder, according to claim 1 further includes; the selection means for selecting the fixed number of input signals between the plurality of input signals and the decoder, wherein; the fixed number of input signals selected by the selection means is input to the display means of the image and the switching means. The decoder, according to claim 9, wherein: the selector means selects a first and second input signal from the plurality of input signals; and the image display means presents a second image based on the second input signal within a first image based on the first input signal, in a smaller display area than the first image. The decoder, according to claim 9, wherein: the selector means selects the first and second input signals among the plurality of input signals; and the image display means linearly presents a first image based on the first input signal and a second image based on the second input signal, respectively, in the same display area. The decoder, according to claim 9, wherein: the selector means selects a first input signal and a plurality of sub-input signals among the plurality of input signals; and the image display means presents a main image based on the main input signal in a predetermined screen, and further presents a plurality of images based on the plurality of sub-input signals in the same screen of the main image, in a presentation area smaller than the main image. The decoder, according to claim 2, wherein; each additional information added to the plurality of input signals is added to a part of the character data information that is added to each image signal of the plurality of input signals as a packet data. 14. The decoder, according to claims 1-3 further includes; the presentation character generating means for decoding respectively the plurality of character data information added to the plurality of image signals to generate a plurality of presentation characters corresponding to each character data information. 15. The decoder, according to claim 1, includes; the means of presenting characters to present a character that shows the control of the presentation over the image during the process of controlling the presentation as superimposed. 16. A method for decoding consists of: a switching step of the input signal for switching and sequentially sending a plurality of input signals having additional information at prescribed switching time; a decoding step of additional information for detecting and decoding each additional information coming from the plurality of input signals that are sequentially introduced by the commutator step; and a presentation control step for respectively controlling the presentation of each image based on the plurality of input signals according to the plurality of additional information.