MXPA97009096A - System of television of image frozen of division of tie - Google Patents

Abstract

The present invention provides a time division frozen image television system, wherein a frame that needs a receiver, can be selected by a simplified configuration. A natural frozen image frame that includes a frame of reference in a certain sequence is repeatedly transmitted, using the frame of reference as a reference. In a receiver device, the reference frame is detected by a reference frame identification signal in the scan line in the vertical retrace interval, in the visual display image or sound, and the frame to be displayed is detected and displayed by counting the number of frames received

Description

SYSTEM OF TELEVISION OF IMAGE FROZEN OF DIVISION OF TIME FIELD OF THE INVENTION The present invention relates to an information service, which is provided using television transmission, such as terrestrial wave transmission, CATV, satellite transmission, etc., and in particular, to a system for providing information service by transmitting frozen picture television.

BACKGROUND TECHNIQUE In the so-called information-oriented age, which is what we currently have, different types of electrical and electronic information are now handled, such as sound, images, text data, binary data, etc., using various types of information elements. transmission. From these different types of electrical and electronic information, low quality voice, low speed monochromatic frozen image, low speed text data, and low speed binary data are transmitted by means of the public telephone line as an electrical signal, the high-speed monochromatic frozen image, the high-speed text data, and the high-speed binary data are transmitted by ISDN (Integrated Service Digital Network) as an electrical signal, and the high-quality voice and the moving image they are transmitted by means of terrestrial wave transmission, satellite transmission, or CATV, as a modulated wave transmission route or by means of optical fiber as modulated light. In the information-oriented age as described above, attention is now focused on interactive information systems as a more promising information system, where the general public, who until now has been merely receiving information from a via sent to him, he can selectively receive and use the information positively. The interactive information systems currently used are answering systems that use an automatic voice response system through a public telephone line, videotex systems represented by CAPTAIN (Character and Telephone Telephone Access Information Network), which use an image frozen, and VRS (Video Response System) that use the moving image through a dedicated line. Among these interactive information systems, the answering system relies solely on audio information. Therefore, it is not possible to obtain sufficient information, and the data entered or taken out can not be confirmed visually.

In the videotex system, characters and images are displayed using character codes. This means that there is a limitation in the content of the visual display, and the image information using character codes can provide a smaller amount of information than a natural image. The VRS system can handle the natural moving image, and has no limitation on the content of the visual display, while the cost of communication is high, because it uses a dedicated broadband transmission line. On the other hand, in the television system currently available, information services such as television purchases, different types of subscription, weather forecast, traffic information, etc. are offered, although they are not interactive. Many of these types of image information needed in these information services are frozen image information, and moving image information is less frequently needed. In this aspect, in the television system currently used, which offers these information services, the frozen image is transmitted as a moving image. That is, when sending from several hundred to several thousand of the same image, a frozen image is displayed on the screen of a television set.

Accordingly, the transmission of the frozen image is very expensive, and is not available to provide an interactive information service to transmit frozen images to satisfy the requirements of the users. For example, in the case of purchases by television, which is a typical information service that uses images, it has been practiced to date that the user uses the information of products in frozen images, which are sent on a track from a transmission station , and an interactive information service has not been provided, where the image of the desired products is displayed on the television set according to the intention of the users, and the users make purchases based on the content displayed. A television image consists of frames. In the NTSC system, as adopted in Japan, the image is sent at a frame rate of 30 frames per second. If a frozen image is transmitted for each frame, 30 natural frozen images per second are transmitted. As the system for transmitting frozen images based on this principle, there is a system called "time division frozen image transmission system". Figure 1 is a schematic drawing explaining the time division frozen image transmission system. In the time division frozen image transmission system, first, the frozen images 3-1, 3-2, 3-3, 3-4, ... are first photographed by independent television cameras 4-1, 4 -2, 4-3, 4-4, ... in a frozen image transmission station 1. Then, these frozen images are composed in television signals, which comprise frames 5-1, 5-2, 5 -3, 5-4, ..., and these are transmitted to the receiving devices of frozen images 2-1, 2-2, 2-3, 2-4, .... When receiving the television signals, the Necessary frames are stored in frame memories in the frozen picture receiving device 6-1, 6-2, 6-3, 6-4, .... Then, the stored frames are read repeatedly from the frame memories, and they are displayed as frozen images in the visual display units 7-1, 7-2, 7-3, 7-4, .... The selection of the Necessary frames, and the recording of the frames in the frame memories, are performed by means such as inserting a frame identification signal into the horizontal scan line during the vertical retrace interval of each frame. In the interactive frozen image information service system, the selection of the necessary frames and their recording in the frame memories are made by inserting the frame identification signal in the horizontal scan line during the retrace interval vertical of each frame, in the frozen image transmission station, and by detecting the frame identification signal in the frozen image receiving device. Figure 2 represents a method for receiving frozen images using the identification mark of the frame. In this figure, among the elements that constitute a frame, an image displayed on a screen is represented by the reference numeral 10, and an image identification signal inserted in the horizontal scanning line during the vertical retrace interval, not shown on the screen, it is represented by reference numeral 11. These are arranged in a vertical direction along a time base. The image 10 includes a menu image 12 and information images 14, 16, .... The frame identification signal 11 includes a menu screen identification signal 13, and information screen identification signals 15, 17, .... These identification signals are designed as different signals, and the desired frame can be selected according to the identification signal. In this case, the menu screen is used to display the information of the entire frozen image, but this menu screen is not necessarily required. Among the frame identification signals used in the time division frozen image transmission system, the signal inserted in the horizontal scan line during the vertical retrace interval between the frames, is the one that is used more generally. In the method that uses these frame identification signals, the identification signal is used for each frame. This means that a problematic procedure is required to insert the identification signals and a consumption of the radio wave resource increases, because the identification signals of the inserted frame occupy the television signal. The present inventor has proposed a method, in Japanese Patent Application Number 6-289357, wherein a specific frame of image is established as a frame of reference, and ordinary picture frames different from the frame of reference can be selected, counting the frame of reference. number of frames, based on the positional relationship with the frame of reference. Also, the present inventor has proposed a method for using the audio band of the television signal as the identification signal of the frame, and a method for using a frame identification signal transmitted by a medium different from the television signal, for example. example, a telephone line.

The present invention is an invention related to Japanese Patent Application Number 6-289357.

DESCRIPTION OF THE INVENTION The frozen image transmitted in the time division frozen image transmission system is transmitted repeatedly in a previously determined sequence. Therefore, if it is known that a specific framework is used as a reference, and in what kind of relation to the specific framework the desired framework is transmitted, the desired framework can be identified using the specific reference framework as a key. Based on the above point of view, it is an object of the present invention to provide a method and an apparatus, by which it is possible to easily capture the desired frozen picture frame in a time division frozen image transmission system. In the method for capturing a frozen image in accordance with the present invention, an added frame with an identification signal is used by suitable elements, such as a frame of reference, although no identifying signal is added to the frames that are to be capture, and are defined by the number of frames counted from the frame of reference. The frame of reference and the frozen picture frames counted from the frame of reference are repeatedly transmitted as a series. In the apparatus for capturing the frozen image according to the present invention, the frame count is initiated by finding the frame of reference, using the identification signal, and the frame, where the predetermined number of frames is counted, is recorded. capture as the frozen image. With the configuration described above, it is possible not only to simplify the configuration of the frozen image capture apparatus, but also to transmit the audio signal and the image signal, different from the identification signal in the different frames of the reference frame, and transmit information using the horizontal scan line during the vertical retrace interval. To insert the identification signal of the reference frame, there are three methods: insert into the horizontal scan line, insert into the image signal, and insert into the audio signal. The information on the number of frames from the frame of reference for the desired frame image is given in advance in some cases, or is given by the frame of reference, or by the information frame, such as the menu screen in some other cases. The frame number is counted in a first field, or in addition in a second field. The present method can also be applied, not only for a television system of frozen images using frames as a series, but also for a television system of frozen time division image, using fields as a series. In this case, the desired frozen image is captured by counting the number of fields, instead of counting the number of frames.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 represents a configuration of a time division frozen image television system. Figure 2 is a drawing explaining the time division frozen image television system. Figure 3 represents a basic embodiment of the present invention. Figures 4 (a) - (c) are drawings that explain one embodiment of the present invention, which uses the vertical retrace interval. Figures 5 (a) - (e) represent drawings that explain an embodiment of the present invention, wherein the frozen images have a hierarchical structure. Figures 6 (a) and (b) represent drawings that explain one embodiment of the present invention, using a plurality of reference frames. Figures 7 (a) and (b) are drawings that explain an embodiment of the present invention that uses images. Figures 8 (a) and (b) are drawings that explain another embodiment of the present invention, which uses images.

BEST MODE FOR CARRYING OUT THE INVENTION In the following, a description will be given of the embodiments of the present invention, with reference to the accompanying drawings. Figure 3 shows a first embodiment of the present invention, wherein a reference frame identification signal is inserted into the horizontal scan line as a basic configuration of the method of the present invention, and frozen image frames are repeatedly transmitted in a previously determined sequence. In this figure, the reference numeral 20 represents an image displayed on a screen between the elements to constitute a television frame. Among the elements that constitute the television frame, a portion of the vertical retrace interval signal not displayed on the screen is represented by the reference numeral 21. These are configured in the vertical direction along the time base . In the image 20, the reference numeral 22 represents a reference time image, and the reference numerals 24, 26, 27, and 28 each represent a different frame image of the reference frame. In the portion of the vertical retrace interval signal 21, the reference numeral 23 represents a vertical retrace interval signal including the identification mark of the reference frame, and the reference numeral 25 represents an interval signal of vertical retrace that does not include the identification signal of the frame of reference. As an example, it is assumed that a frozen image frame that a user wants to receive, has been transmitted at 50 ° in the order counted from the frame of reference. When the number of frames, ie 50, that the user wishes to receive is counted, they are put into the receiving device of frozen images, and the receiving device of frozen images first observes the vertical retrace interval signal of each frame. When the identification signal of the reference frame has been found, the frame count is started according to the following vertical retrace interval. When the previously determined account is counted (50 in this case), the frame is captured as a frozen image, and the captured frozen image is displayed. Now, the description will be given about a method to count the frames. In the NTSC television system with interleaved scanning, a frame constituting an image comprises two fields, that is, a first field and a second field. Because a television signal for a frame comprises 525 horizontal scan lines, a frame comprises the first field and the second field, each comprising 262.5 horizontal scan lines. Therefore, the initial position of the scan lines is different between the first field and the second field. The scan line of the first field starts from one end of the screen, while the scan line of the second field starts from the center of the screen. In other words, the time to start in the first field of a vertical synchronization signal separated from the horizontal synchronization signal, is in accordance with the rise time of the horizontal synchronization pulse, while the time to start in the second field is delayed by half cycle (H / 2) of the horizontal synchronization pulse from the elevation time of the horizontal synchronization pulse. The framework account is made according to the previous principle. It is judged that the field in which the start time of the vertical synchronization signal is in accordance with the rise time of the horizontal synchronization pulse is the first field, and that the field where the start time of the synchronization signal vertical is delayed by half cycle (H / 2) of the horizontal sync pulse from the horizontal synchronization pulse rise time, is the second field, and any of them is counted. In this case, the number of frames is counted in general by the first field, while the number of frames can be counted by the second field when necessary. Now, a description will be given about the identification signal of the frame of reference. The television signal comprises video signal and audio signal, and the audio signal further comprises the image signal and the synchronization signal. In the image signal, there is information displayed on a screen and information inserted in the vertical retrace interval, and not displayed on the screen. Therefore, simply speaking, the identification signal of the reference frame can be inserted into the audio signal, the visual display screen, and the vertical delay interval. Figure 4 shows signal forms for transmitting teletext programs and subtitled television programs, as has been practiced until now, to explain the case where the identification signal of the reference frame is inserted in the vertical retrace interval. In this figure, the polarity of the signal is inverted. Figure 4 (a) shows signals from the first field of the television signal, and Figure 4 (b) shows signals from the second field. In these figures, the horizontal synchronization pulses and the equalizing pulses are shown below, while the signals inserted in the horizontal scanning line are shown above. The signals of the first field in Figure 4 (a), and those of 1-3H and 7-9H and the last half of 273H-265H and 270H - the last half of 272H in the second field shown in Figure 4 (b ), are equalizing impulses. The signals of 4-6H and the last half of 266H - the first half of 269H, are the vertical synchronization pulses, and no signal is inserted into the horizontal scan line of these portions. Television picture signals are inserted at 22-62H and 263H, and the latter half at 265H, 286 - 524H, and the first half at 525H. Accordingly, 10-21H and 273-284H can be used for the insertion of different types of signals. However, 17-20H and 280-283H are used for the operation of the transmission station, and therefore, 10-16H, 21H and 273-279H and 284H are actually available. In the teletext transmission, scanning lines 14-16H, 21H, 277-279H, and 284H are used, in view of the compatibility of the existing receiver device. The subtitle signal can be inserted in 21H and 284H.

Figure 4 (c) shows a form of the data format in case the text signals are multiplexed in the horizontal scanning line of the teletext transmission. The reference numeral 33 represents a video signal, and the portion between the horizontal synchronization pulses 34 and 35, is the horizontal scanning line where the signals are inserted. Immediately before the signals, a color burst signal 36 is inserted. After the color burst signal 36 is inserted, a data line 37 is inserted. On the data line 37, 296 data may be inserted. bits, and comprise a synchronization portion 38 having a 24-bit data capacity, and a data packet 39 having a data capacity of 272 bits. In addition, the data packet 39 comprises a prefix 40 having a data capacity of 14 bits, and a data block 41 having a data capacity of 176 bits, and a verification signal 42 having a data capacity of 82 bits, and the teletext transmission data are inserted in the data block 41. The identification signal of the frame of reference used in the present invention can be inserted in the data block 41 of the teletext transmission currently practiced. Because this data block has a capacity as large as 176 bits, a large amount of information can be included in the identification signal of the reference frame, and can be used for the hierarchy of identification signals of the frame of reference. reference, as described later. The data block in the teletext transmission has a large data capacity, and a large number of reference frame identification signals can be inserted, while the teletext signals, ie the digital data, are difficult to detect. record on a videotape recorder for home use. In addition, it is very difficult to reproduce exactly the recorded data due to the high or delayed phases caused by the elongation or shrinkage of the video tape, or by an irregular rotation of the head. For this reason, it is not available to fix a transmission system, which can produce a program of transmission of frozen images that includes the identification signal of the reference frame inserted in the data block of the teletext transmission, and transmit and record it in The video tape recorder for home use. On the other hand, since subtitled television has a smaller amount of data that can be recorded on the videotape recorder for home use, it is possible to fix a transmission system, which can produce programs for transmitting frozen images, including signals identifying the reference frame inserted in the portion of the subtitle signal, and also recording the program in the video cassette recorder for home use. Instead of the signal form on the subtitled television, it is possible to use an identification signal of the reference frame according to an original signal form having less amount of information. A description of the count of the number of frames from the reference frame will now be given. As described above, frames are counted using the relationship between the start time of the vertical synchronization signal, and the rise time of the horizontal synchronization pulse as a key, and the field where they match with each other , that is, the field where there is 4H, is judged as the first field. The field where they do not agree with each other, that is, the field where there is 266H, is judged as the second field. Therefore, the number of frames is counted by the account of only one of the fields. A more concrete account is made using a previously established counter to produce a signal when a predetermined number has been counted. The number of frames to be counted, as it is arranged by different types of elements, it is put in advance to the counter that can be established previously, as previously established data. When the reference frame signal is detected, the previously settable counter performs the processing, such as the initialization of the number of accounts, and counting of the number of frames begins. The previously established counter is divided into an up counter and a down counter. In the case of the previously established up-counter, the number of frames is counted as described above. When the number of frames entered in advance has been reached, the counter produces the signal, and the frozen image is captured in the frame memory by this signal. As the previously settable counter, the previously settable counter up successively adds the counted value that is used in general, while the previously settable down counter successively subtracts the count value that can be used. In the case that the previously stable counter down is used, contrary to the case of the previously settable up counter, the number of frames counted is subtracted from the number of frames entered in advance. When the subtraction result reaches zero, the previously settable down counter produces the signal, and the frozen image is captured in the frame memory by this signal. When the number of frames is counted, and the signal corresponding to the result is produced to capture the frozen image in frame memory by this signal, if the number of frames is counted using 4H of the first frame as a key, the time interval is: 18 / (525 X 30) = 1/875 seconds, because the interval up to 22H where the image signal is inserted is 18H. In case the operation of the circuit to control the frame memory is slow, you can not capture the desired frozen image in the frame memory. In such a case, the operation to capture the frozen image starts when the first field or the second field of the frozen image has been counted one frame before. In order to capture the frame of the frozen image as desired, by means of the frame counting method, it is necessary to have information on the number of frames from the frame of reference of the frozen image. The most simplified procedure is to provide information on the number of frames in advance, by means of printed matter, while it is possible to execute the frame counting method only by transmitting frozen images, that is, by transmitting it uses an information frame such as a menu screen, and the frame of reference is transmitted in the transmission of frozen images, without using another means of information, such as printed matter.

Furthermore, by providing the reference frame with the function of the menu screen, and by giving the sub-menu function to the frozen image screen captured according to the menu, it is possible to hierarchize the frozen image, and transmit various types of images. frozen image information. Figure 5 represents a modality with the previous configuration. A basic television signal configuration is used in the case of the menu screen, with the frame counting method shown in Figure 5 (a), and the visual display examples of the menu screens shown in Figures 5 (b) - (e). In the television signal configuration shown in Figure 5 (a), the reference numeral 50 represents an image displayed on a screen between the elements constituting the frame, and 51 represents an identification signal inserted in the horizontal scanning line during the vertical retrace interval not displayed on the screen between the elements that constitute the frame, and are configured in the vertical direction along the time base. The image 50 comprises a reference menu screen 52, a plurality of sub-menu screens 54, 58, 61, ..., and information screens 56, 57, ..., that accompany each of the menu screens 54, 58, 61, .... Also, the signal 51 comprises a reference frame identification signal 53, and the signals 55, 55, 55, ..., which do not contain identification signals. In the reference menu screen 52 shown in Figure 5 (b), the numbers of frames accounts are displayed in each of the sub-menu screens 54, 58, and 61. In addition, the menus of the screen of information included in a sub-menu A, are displayed included in screen 54 of sub-menu A. The menus of the information screen included in a sub-menu B, are displayed on screen 58 of sub-menu B. the screen 61 of the sub-menu C, the menus of the information screen included in the sub-menu C are displayed. To simplify the explanation in this mode, the sub-menu screens are supposed to be three screens of A, B , and C, and that 9 information screens are included in each of these sub-menu screens. The previous number is used to facilitate the explanation, and it is not necessary to say that any other number can be used as the screen number. Also, in Figures 5 (c) - (e), only 4 menus of information screens are displayed, while 9 menus are actually displayed in the menu screen of this mode. In the system of the modality described above, the receiving device initially recognizes the identification signal of the reference frame 53. Then, the reference frame screen 52 is captured in the frame memory of the receiving device, and the screen is displayed from the reference menu 52 as shown in Figure 5 (b). If the receiver sees the screen and wishes to have the display of the sub-menu A, and puts "01" for example, the receiver's device recognizes again the identification signal of the frame of reference repeatedly transmitted. Then, counting the number of frames starts from the recognized reference screen. When the "1" is counted, the sub-menu A screen is captured in the frames memory, and displayed. When the number of the desired information screen is entered, for example, "04", according to the sub-menu displayed on the sub-menu screen A, the receiver's device calculates as: "1 + 0 X 10 + 4 = 5", because the fourth information screen of the sub-menu is at 5o (1 + 0 X 10 + 4 = 5), counted from the reference frame. The identification signal of the frame of reference transmitted repeatedly, is recognized again. The count of the number of frames starts from the recognized reference screen, and when the number "5" is counted, the information screen is captured in the frame memory, and displayed. In the case of the other sub-menu screens, similar processing is also performed. For example, in case you want to see the second information screen of sub-menu C, first enter the number "21" to select sub-menu C from the reference menu screen, and display the sub -C menu C located at 21 ° from the frame of reference. Then, when the number "02" is entered via sub-menu C, the receiver device calculates as: "1 + 2 X 10 + 2 = 23", and the identification signal of the reference frame is recognized again as It was repeatedly transmitted. The count of the number of frames starts from the recognized reference screen, and when the number "23" is counted, the information screen is captured in the frame memory, and displayed. With the configuration described above, the frame count of the menu form can be performed by a single frame of reference. In the case where the identification signal of the reference frame is inserted in the horizontal scan line during the vertical retrace interval, it is possible to insert a signal different from the identification signal of the reference frame, not only in the case of that the teletext signal method be adopted as the form of the identification signal, but also in the case that the subtitling system is adopted. Based on this, it is possible for the receiver to obtain the frozen image, with which the receiver is interested, within a short time, either directly or indirectly, by giving different data of the frame of reference to a plurality of frames of reference. Figure 6 shows a modality with the previous configuration. Figure 6 (a) shows a basic television signal configuration in the case that the frame counting method is executed, using a plurality of reference frames. Figure 6 (b) represents a modified television signal configuration. In the television signal configuration as shown in Figure 6 (a), the reference numeral 70 represents an image displayed on a screen between the elements constituting the frame, and 71 represents a signal inserted in the scan line horizontal during the vertical retrace interval not displayed on the screen between the elements that make up the frame, and are set in the vertical direction along the time base. The image 70 comprises a plurality of reference frames 72, 77, 81, ..., and information screens 74, 76, ..., 79, 80, ..., 83, 84, ..., which accompany to these frames of reference. The signal 71 comprises the identification signals of reference frames 73, 78, 82, ..., each being a different signal, and the signals 75, 75, 75, ... which do not contain any identification signal. Information about frames of reference is given in advance to the recipient. When the receiver inserts the data of the identification signal of the desired reference frame into a device of the receiver, a frame of reference is captured with the identification signal of the corresponding reference frame, for example, the frame of reference of a screen of reference A, for example, in the frame memory of the receiver device, and it is displayed. Reference screen A is a menu screen as shown in Figures 5 (c), (d), or (e). When the receiver selects the desired information screen from the menu screen, and enters its number, for example, the number "03", the receiver device recognizes again the identification signal of the reference frame A transmitted repeatedly. The count of the number of frames starts from the recognized reference screen, and when the number entered "3" is counted, the information screen is captured in the frame memory, and displayed. The frames of reference and frames of frozen image that accompany the frame of reference, can be configured as a continuous group, as shown in Figure 6 (a), while the reference frames 72, 77, 81, ... can be configured continuously, and the frozen image frames 74, 79, 83, ..., and the Frozen image frames 76, 80, 84, ..., can be configured continuously, respectively as shown in Figure 6 (b). By doing so, it is possible to reduce the waiting time of the receiver. In the foregoing, a description has been given in the case where an identification signal of the reference frame is inserted in the horizontal scan line during the vertical retrace interval. In the following, a description will be given in the case where it is inserted into other signals. When the identification signal of the reference frame is inserted in the video signal, it can be inserted in the horizontal scanning line, where the video signal displayed on a screen is inserted in general. In this case, the identification signal of the reference frame is displayed on the screen of the receiver's device. However, this screen is for a long frame at most, that is, for 1/30 seconds, and it is the time for the different horizontal scanning lines when it is short, and this is practically negligible. Figure 7 (a) shows a first example. An alternating current signal 19, synchronized with a horizontal scanning line, and having the same frequency, is inserted into the horizontal scanning line 90 of the video signal. The alternating current signal 91 is an alternating current having the frequency of: 525 X 30 = 15.75 KHz, and can be easily detected by using a band filter, which allows only this frequency to pass. Because this signal continues for a certain period of time, it can be easily identified, even when another similar signal may be present. In this case, it is exhibited a vertical strip with graduation on the screen. Figure 7 (b) represents a second example. An alternating current signal is inserted with 1/4 cycle of the horizontal scan line, and synchronized with the horizontal scan line, in the video signal. This alternating current signal is an alternating current signal having the frequency of: 525 X 30 X 4 = 63 KHz, and can be easily detected by using a band filter, which allows only this frequency to pass. Because this signal is also continuous for a certain period of time, it can be easily identified, even when another similar signal is present. In this case, four vertical stripes with graduation are displayed on the screen. Figure 8 (a) shows a third example. The identification signal of the reference frame of this example is different from that shown in Figure 7. The entire horizontal scanning line contains a luminance signal of the same level. A plurality of signals with different luminance intensities are combined and repeated. In this example, a horizontal scanning line 93 is repeated with five blank luminance level signals, and a horizontal scanning line 94 with five black luminance level signals. The signals are integrated by an integration circuit, and are discharged by a discharge circuit, which has the time constant of - 5 / (525 X 30) seconds. As a result, a triangular wave having the frequency of 3150/2 = 1575 Hz is obtained. By means of this triangular wave, the frame of reference is identified. In this case, approximately four black / white horizontal stripes are displayed on the screen. Figure 8 (b) shows a fourth example. The identification signal of the reference frame of this example is different from that shown in Figure 8 (a). The entire horizontal scanning line contains a luminance signal of the same level, but the luminance level for each of the horizontal scanning lines 95 changes in the sine wave form. In this example, the luminance level changes with 10 horizontal scan lines as one unit. This signal is collected as a luminance signal, and a sine wave is obtained that has the frequency of 3150/2 = 1575 Hz from the luminance signal thus collected, and the reference frame is identified from this sine wave. In this case, approximately 24 black / white horizontal stripes are displayed on the screen.

Finally, a description will be given of the case where the identification signal of the frame of reference in the audio signal is inserted. Because the television system also uses sound, it is also possible to insert the identification signal of the reference frame into the audio band. As the identification signal of the reference frame to be inserted into the audio band, there is sound inserted in the main audio band, sound inserted in the sub-audio band, and signals other than the sound inserted in the audio band. sub-audio. In the case where the identification signal of the reference frame is inserted in the main audio band, the identification signal of the reference frame is heard as sound by the receiver. To avoid this, the identification signal of the reference frame must be inserted in the sub-audio band. Also, as the signal to be inserted into the sub-audio band, a suitable control signal other than sound can be used. In a television set, the video signal and the audio signal are processed separately, and even when trying to use the signal inserted in the audio band as a control signal to select a frozen image, it can not be performed an appropriate control.

In such a case, it would be better to transmit the inserted signal in the audio band earlier than the corresponding frozen picture frame. In the above embodiments, a description of the case has been given mainly in that the frozen image is supplied by transmission elements, while the frozen image in the time division frozen image television system according to the present invention can be be provided by a video package, such as a videotape or a video disc. In particular, in the case that the same frozen image is transmitted for a long time, it is effective to use an endless video tape.

INDUSTRIAL APPLICABILITY As described above, in a system to provide information service by transmission of frozen image television, if a specific frame is used as a reference, and if it is known in what kind of relation with the specific frame the desired frame is transmitted , the desired frame can be identified using the specific frame of reference as a key in the present invention, which provides a method and an apparatus for easily executing the capture of the desired frozen picture frame.

Claims (8)

1. A time division frozen image television system for using a plurality of frozen images by means of the time division frozen image system, wherein: a frame of the frozen image comprises a frame of reference having an identification signal and an information frame that has no sign of identification; the information frame comprises a menu screen frame and an information screen frame; a positional relationship of the menu screen frame is established in the frame of reference, at a constant value; the counting information is displayed on the positional relationship of the information screen frame to the frame of the menu screen, on the menu screen; the frame of the menu screen configured in a specific position with the frame of reference is detected, according to the frame of reference that has the identification signal as a reference; and the number of frames is counted according to the positional relationship displayed in the frame of the menu screen, and a desired information screen frame is detected.

2. A time division frozen image television system according to claim 1, wherein there is a plurality of reference frames, and each of the plurality of reference frames has a different identification signal.

3. A time division frozen image television system according to claim 1 or 2, wherein the menu screen frame is displayed as an initial operation, and a basic operation of the freeze frame television system of division of time. A time division frozen image television system according to claim 1 or 2, wherein the frame of the menu screen comprises a main menu screen frame and a sub-menu screen frame, and the frame of the main menu screen is set at a specific position with the frame of reference; and the sub-menu screen frame is set to a specific position with the frame of the main menu screen. 5. A time division frozen image television system, for using a plurality of frozen images by means of the time division frozen image system, wherein: a frame of the frozen image comprises a frame of reference having a signal of identification and an information frame that has no sign of any identification; the information frame comprises a menu screen frame and an information screen frame; the positional relationship of the menu screen frame with the reference frame is set to a constant value; the counting information on the positional relationship of the information screen frame with the menu screen frame is displayed on the menu screen; and by adding the count of the positional relation to the constant value, the positional relationship of the information screen frame with the reference frame is calculated. 6. A time division frozen image television system according to claim 5, wherein there is a plurality of reference frames, and each of the plurality of reference frames has a different identification signal. 7. A time division frozen image television system according to claim 5 or 6, wherein the menu screen frame is displayed as an initial operation, and a basic operation of the split-freeze-frame television system of time. 8. A time division frozen image television system according to claim 5 or 6, wherein the menu screen frame comprises a main menu screen frame, and a sub-menu screen frame, and The main menu screen frame is set to a specific position with the reference frame, - and the sub-menu screen frame is set to a specific position with the main menu screen frame.