JPH0424699Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Industrial Application Field] This invention is based on the North American Display Level Protocol Syntax System (hereinafter referred to as the NAPLPS system).
The present invention relates to a videotex receiving device. [Prior Art] Conventionally, videotex services are a type of information communication system called new media, and are two-way communication between an information providing device at an information center and a user's videotex receiving device using a telephone line or the like. By performing directional communication, digital signals of character and graphic information desired by the user are transmitted from the information center to the user. Note that the digital signal to be transmitted includes not only text and graphic information but also various control information and the like. A videotex receiver usually includes a microcomputer and a television receiver.
The characters and figures of the digital signal received via the telephone line are displayed on the television screen. Conventional video text receiving devices only display received characters and graphics on a CRT in the order in which they are received, but if you want to record and save desired text and graphics information, for example, The digital signal or video signal may be recorded on a video tape recorder or the like. By the way, videotex transmits digital signals of text and graphic information using telephone lines, and in this case, since the telephone line is a so-called narrowband information transmission path, it is difficult to transmit digital signals of text and graphic information at high speed. Therefore, it takes a considerable amount of time from the start of receiving the text and graphic information to the end of receiving the text and graphic information for one page, that is, one screen. The video text receiving device is provided with one page memory that rewrites and stores the digital signals of received character and graphic information for one screen at a time, and converts the digital signals of the characters and graphics stored in the memory into video signals. A character generator is provided that converts the signal into a CRT and outputs it to a CRT. Therefore, for example, if the video tape recorder is immediately set to recording mode and starts recording the video signal of the character generator described above immediately after starting to receive the digital signal of desired character or graphic information, the video tape recorder can display a complete one-screen image. Not only the video signal of the desired character and graphic information for each minute, but also the video signal of one screen's worth of character and graphic information that is being received is recorded. When this happens, it becomes extremely uneconomical. In order to eliminate the above-mentioned drawbacks, Utility Application No. 59-39271 proposes a configuration as shown in FIG. It is described that the video signal is recorded on a video tape recorder. By the way, to explain the operation shown in FIG. 2, when a digital signal of received information is input to the communication interface circuit 2 via the telephone line 1, the digital signal is sent to the video screen via the general-purpose asynchronous transmitter/receiver circuit (UART) 3. Tux decoder and control circuit i.e.
NAPLPS is input to the decoder/control circuit 4, which separates and extracts the character/graphic information and control information in the received information, and also outputs the digital signal of the character/graphic information and the write address signal from the circuit 4. The data is sent to the page store memory 7 via the data bus 5 and address bus 6, respectively. Further, the extracted control information is sent from the circuit 4 to the blink detection circuit 8. On the other hand, a read address signal is output from the display timing signal generation circuit 9 to the memory 7 via the address bus 6, and the address specified by the read address signal is output from the memory 7 to the character generator 10 via the data bus 5. Digital signals of character and graphic information are read out. Then, the character generator 10 outputs the input digital video signal of characters and graphics to the CRT 11 of the television receiver.
The characters and figures of the received information are displayed on the CRT 11. Reference numeral 12 denotes an operation keyboard and decoder, which sends digital signals for specifying various information, such as desired character and graphic information, to the host computer of the information center via the transmitting/receiving circuit 3, interface circuit 2, and telephone line 1. Send out. Further, an interface circuit 2, a transmitting/receiving circuit 3, a decoder/control circuit 4, etc. are formed by a microcomputer. By the way, the screen display command format (PICTURE-DESCRIPTION) used for NAPLPS videotext services is
The operation code and operands of INSTRUCTIONS are configured as shown in Figure 3, where the first byte (8 bits) is the operation code (OP CODE), and each subsequent byte is the multiple operands (OPERANDS). Each is used. In addition,... in the figure...
...,, indicate the 0th to 7th bits, and X indicates 0 or 1. The sixth bit is set to 0 in the case of an operation code forming control information, and is set to 1 in the case of an arithmetic number forming character, graphic information, etc. Furthermore, as shown in Figure 3, the operation codes include RESET, DOMAIN,...
..., BLINK, etc. For example, the BLINK operation code consists of the codes "X, 0, 1, 1, 1, 1, 1, 1", and it also covers one screen. It is sent after the text and graphic information. Note that b ₀ , b ₁ , b ₂ , b ₃ , b ₄ , b ₅ , and b ₆ in FIG. 4 indicate the 0th to 6th bits. Therefore, the blink detection circuit 8 decodes the input control information, and when the blink operation code, that is, the code "X, 0, 1, 1, 1, 1, 1, 1" is input, the video tape recorder 13 A detection signal is output to the recording command input terminal r and the timer circuit 14. Furthermore, when the video input terminal i is connected to the character generator 10, the pause command input terminal p is connected to the timer circuit 14, and the detection signal is input to the input terminal r, the video tape recorder 13 enters the pause mode. The mode shifts to the recording mode, and recording of the video signal input to the input terminal i, that is, the video signal of character and graphic information is started. By the way, when the blink operation code is output, since the transmission of one screen's worth of character and graphic information has been completed as described above, at this time, the digital signal of one screen's worth of character and graphic information is stored in the memory 7. Completely written and memorized. Therefore, when the blink operation code is output, the character generator 10 to CRT1
1 and the input terminal i of the video tape recorder 13
The video signal outputted to the 1 screen becomes a video signal of character and graphic information for one complete screen, and only the video signal of character and graphic information for one complete screen is recorded on the video tape recorder 13. The video signal that is in the middle of receiving character and graphic information for minutes is not recorded. On the other hand, the timer circuit 14 is activated by the detection signal, and after a predetermined period of time has elapsed until the recording of the video signal of one screen's worth of characters and graphics information is completed, recording is stopped from the timer circuit 14 to the input terminal p of the video tape recorder 13. Output a signal. Therefore, when the video tape recorder 13 finishes recording the video signal of character and graphic information for one screen, it shifts from the recording mode to the pause mode and stops recording. Therefore, in the video tape recorder 13,
Since only the video signal of the complete character and graphic information for one screen is recorded, and the video signal that is in the middle of receiving the character and graphic information for one screen is not recorded, desired character and graphic information can be recorded economically. It becomes possible to save the data. [Problem that the invention attempts to solve] By the way, the blink operation code can be used to
It is not necessarily sent every time the graphic information screen is updated. Therefore, when the desired character and graphic information consists of information on multiple screens, there is a problem that the desired character and graphic information cannot be completely automatically recorded unless the blink operation code is transmitted every time the screen is updated. [Means for solving the problem] This invention detects the operation code of the received screen filling command in a videotex receiving device using the North American display level protocol syntax, and detects the operation code of the received screen filling area with the code. It has a fill-in detection means that outputs a control signal when the fill-in area based on the information is equal to or larger than a set area, and a function to rewrite and store digital signals for one screen of character and graphic information, each time the control signal is output. two memories into which digital signals of received character and graphic information are inputted alternately, and characters read from one or the other of the two memories to which input of digital signals of received character and graphic information is stopped; a video converter that converts a digital signal of graphic information into a video signal; a video tape recorder that starts recording the video signal upon input of the control signal; The videotex receiving apparatus is provided with a timer means for outputting a recording stop signal to the video tape recorder after a predetermined period in which one screen worth of video signals is recorded. [Operation] In the case of the NAPLPS method, when updating the screen, the operation code for the screen filling command and information on the filling area are always transmitted, and after specifying the filling of the entire screen, the next screen is updated. When the specified filling area is equal to or larger than a predetermined area, the detection means outputs a control signal, and the digital character and graphic information for one screen is sent immediately before the operation code for the filling command is received. Updated every time the screen is updated by recording the video signal for one screen immediately before the reception of the operation code on the video tape recorder based on the digital signal read from one or the other memory storing the signal. It becomes possible to automatically record the video signal of text and graphic information for the previous screen. [Example] Next, this invention will be explained in detail with reference to FIG. 1 showing one example. In FIG. 1, the same symbols as those in FIG.
Characters, by NAPLPS decoder and control circuit 15.
Graphic information and control information are separated and transmitted to the shift register 16, and the shift register 16 outputs digital signals for character and graphic information and write address signals to the data bus 5 and address bus 6, respectively. A fill detection circuit 17 forming a fill detection means from
Control information is output to. In addition, the control information includes:
The above-mentioned blink operation code and operation code for a screen filling command are included. As mentioned above, in the NAPLPS method, when updating the screen, the operation code for the screen filling command and the information on the filling area are always transmitted, and after specifying that the entire screen is to be filled with blue, for example, the next A new screen of characters,
A digital signal of graphical information is transmitted. Note that even during the formation of one screen, an operation code for a screen filling command and information on the area to be filled are transmitted, and partial filling of one screen is specified. By the way, one screen was created in July 1983.
For example, as shown on page 84 of BYTE Publication Inc.
y, dx and dy are operation codes for screen filling commands, and after drawing is specified by SO of a,
After the entire screen is specified to be filled with blue based on the CONTROL, ..., dx and dy operation codes of b, the color specification information of blue, and the information of the filling area, a new screen is created using c or i, respectively. Formed sequentially. In addition, for example, c
CONTROL, POLYGON, etc. are also operation codes for commands to fill in the screen, and c to i are used to partially color the screen. Therefore, the detection circuit 17 uses CONTROL,
In addition to detecting the operation code of the screen filling command of RECTANGL,..., the information on the filling area received with the code, that is, the received
Compare the filled area based on the values of dx and dy with the dx and dy values of the set area set in advance, and check if the received filled area is

【table】

【table】

[Effect of idea]

Therefore, according to the video text receiving device of this invention, each time the screen is updated, the video signal of character and graphic information for one screen immediately before the update is automatically recorded on the video tape recorder, and the desired character and graphic information is recorded. Video signals can be completely and economically automatically recorded.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of one embodiment of the videotex receiving device of this invention, Fig. 2 is a block diagram of a conventional videotex receiving device, Fig. 3 is an explanatory diagram of the screen display command format, and Fig. 4 is the operation. It is an explanatory diagram of the code. 7, 18... Page store memory, 13... Video tape recorder, 17... Fill detection circuit, 19, 20, 21... Switch, 22... Character generator, 23... Timer circuit.

Claims (1)

[Scope of utility model registration request] A video text receiving device using the North American display level protocol syntax detects the operation code of the received screen filling command, and outputs a control signal when the filled area based on the filled area information received with the code is equal to or larger than the set area. and a function to rewrite and store one screen worth of digital signals of character and graphic information, and each time the control signal is output, the received digital signals of character and graphic information are alternately input. and a video conversion means for converting the digital signal of the character and graphic information read from one or the other of the two memories into which the input of the digital signal of the received character and graphic information is stopped into a video signal. a video tape recorder that starts recording the video signal upon input of the control signal; and a timer activated upon input of the control signal;
A video text receiving device comprising: timer means for outputting a recording stop signal to the video tape recorder after a predetermined period of time during which one screen worth of video signals is recorded on the video tape recorder.