JPH03289889A - Teletext receiver - Google Patents

Abstract

PURPOSE:To store character graphic information with a required minimum memory capacity by constituting the teletext receiver with a memory storing the character graphic information of a received teletext program, a memory management means dividing the memory into small blocks and combining the small blocks in response to the data size of the teletext program so as to form a data storage area and a memory provision means providing a different data storage area for each program of the teletext. CONSTITUTION:A memory provision mean 13 stores a program number whose data storage area is already provided to a RAM 4. Upon the receipt of a teletext program, the number is read and compared with the number of the program stored in the RAM 4 and whose data storage area is already provided. When the data storage area is not yet given, the data storage area is provided, in which the data is stored and the program number is stored in the RAM 4. The data storage area different from each teletext program is provided by repeating the operation. Moreover, the size of each data storage area is a required minimum size by a memory management means 12.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a teletext receiving device that receives and decodes character and graphic information multiplexed with television broadcasting and displays it on a display unit such as a CRT. be.

2. Description of the Related Art In recent years, various television multiplex broadcasts have been considered in order to make effective use of broadcast waves. Teletext broadcasting that can display information on the screen of a TV receiver has already been put into practical use.With 0 text broadcasting, users select the program they want to watch, then receive the selected program and display it on the screen. It requires some waiting time. In order to eliminate this waiting time, it is widely practiced to provide teletext receiving apparatuses with a data storage function. The data storage function is a function that receives a teletext program in advance, stores the program data in the memory of the teletext receiver, searches the memory for the data of the program selected by the user, and displays it immediately. It is.

Hereinafter, a teletext receiver having the data storage function as described above will be described with reference to the drawings.

FIG. 4 shows the configuration of a conventional teletext receiver.

In FIG. 4, 1 is a text/graphic information decoding unit that decodes text/graphic information into a text/graphic image; 2 is a text/graphic information decoding unit 1;
3 is a receiving circuit that extracts character and graphic information from the video signal as digital data; 4 is a RAM used as a work area for the microprocessor circuit 2; 5 is a program for controlling the microprocessor circuit 2; 7 is a display memory for storing the character and graphic information decoded by the microprocessor circuit 2; 6 is a display processing circuit for synthesizing the character and graphic information stored in the display memory 7 into RGB signals; 9; 8 is a character generator used to decode text and graphics information into text and graphics images; 8 is an additional sound decoder that processes additional sound data included in the text and graphics information; lO is a keypad that instructs selection of text and graphics information, etc. , 11 is a data storage memory for storing received character/graphic information.

20 is a television signal receiving section, 21 is an antenna, 2
2 is a television signal receiving circuit, 23 is an audio demodulation/amplification circuit, 24 is a brightness amplification/color demodulation circuit, and 25 is a television digital video/audio signal, an RGB signal and an additional sound signal output from the character/graphic information decoding section 1. 26 is an audio amplification output circuit;
7 is a video amplification output circuit, 28 is a speaker, and 29 is a display unit that displays video on the screen.

The operation of the teletext receiving apparatus configured as described above will be described below.

The television signal input from the antenna 21 is transmitted to the television signal receiving circuit 22 of the television signal receiving section 20.
The signal is demodulated and the video and audio signals are extracted. The video signal is input to the receiving circuit 3 of the character/graphic information section 1, character/graphic information is extracted from the video signal, and the character/graphic information is stored in the data storage memory 11. By operating the keypad 10, the user instructs the microprocessor circuit 2 to select text and graphic information of a desired program from among the many text and graphic information stored in the data storage memo January 1. to request. The microprocessor circuit 2 selects the instructed character and graphic information, and according to the contents of the program stored in the ROM 5,
Further, the character generator 9 is used as necessary to convert the character/graphic information into a character/graphic image, which is then stored in the display memory 7. The character and graphic images stored in the display memory 7 are synthesized into RGB signals by the display processing circuit 6. Further, the additional sound data included in the width of the character/graphic information is converted into an additional sound signal by the additional sound decoder 8.

On the other hand, the audio signal and video signal demodulated by the television receiving circuit 22 are input to and processed by an audio demodulation amplifier circuit 23 and a brightness amplification/color demodulation circuit 24, respectively, and then input to a video/audio switching circuit 25. Ru. The video/audio switching circuit 25 converts the video signal (RGB
signal) and audio signal (additional sound signal), and the television video signal and video signal.
The former is selected when displaying a character/figure image, and the latter is selected when a television image is displayed, and the audio amplification output circuit 26,
Each speaker 28 is connected through the video amplification output circuit 27.
, is input to the display section 29. Through the above operations, the user can display text and graphic information on the display section 29.

Next, the data storage function of a conventional teletext receiver will be explained.A character broadcast program is usually composed of multiple pages of character and graphic information. Text and graphic information for each page is sent from the broadcast station at fixed time intervals (standard 20 seconds). Therefore, if all character and graphic information data received during a certain period of time of 20 seconds or more are stored in the storage memory 11,
For each teletext program, at least one page of character and graphic information can be stored. User has 10 keypads
When you select a program by operating , you can immediately display text and graphic information for the desired program.

Problems to be Solved by the Invention However, in the teletext receiving device configured as described above, when character and graphic information of all pages of the teletext program is stored in the memory 11, the total number of pages of the teletext program is Since it is not constant, the data accumulation time required to accumulate all pages varies. In order to accumulate all the pages of all the teletext programs broadcast on a single television channel, it is necessary to match the data accumulation time to the program with the largest number of pages. In this case, programs with a small number of pages have the problem of poor memory usage efficiency, in which the same character and graphic information is stored redundantly and more memory is used than necessary.

In view of the above-mentioned problems, the present invention provides a teletext receiving apparatus that can store data of all pages of all teletext programs using the minimum necessary memory.

Means for Solving the Problems In order to achieve this object, the teletext receiving device of the present invention includes a memory for storing character and graphic information of received teletext programs, and a memory that is divided into small blocks to receive teletext broadcasts. It is comprised of a memory management means that combines the small blocks to form a data storage area according to the data size of the program, and a memory allocation means that allocates a different data storage area for each teletext program.

Operation The present invention provides the minimum necessary memory according to the data size of the received teletext program with the above-described configuration, so that the text and graphic information of all pages of all programs can be stored with the minimum necessary memory capacity. It becomes possible to do so.

EXAMPLE An example of the present invention will be described below with reference to the drawings. FIG. 1 shows the configuration of a teletext receiver according to an embodiment of the present invention.

In FIG. 1, l is a character/graphic information decoder, 3 is a receiving circuit, 4 is a RAM, 5 is a ROM, 6 is a display processing circuit, 7 is a display memory, 8 is an additional sound decoder, 10 is a keypad,
11 is a data storage memory, 2o is a television signal receiving circuit, 23 is an audio demodulation amplification circuit, 24 is a brightness amplification circuit/color demodulation circuit, 25 is an audio video switching circuit, 26 is an audio amplification output circuit, and 27 is a video amplification circuit. The output circuit, 28 is a speaker, and 29 is a display section, which is the same as the configuration shown in FIG. 4. 2 also includes a memory management means 12 that divides the data storage memory 11 into small blocks and combines the small blocks according to the data size of the teletext program to form a data storage area; This is a microprocessor circuit having memory providing means 13 for providing different data storage circuit areas.

The operation of the teletext receiving apparatus configured as described above will be described below.

The teletext receiving apparatus of this embodiment can basically operate in the same manner as the conventional teletext receiving apparatus shown in FIG.

FIG. 2 is a diagram explaining the operation of the memory management means 12 of this embodiment. In FIG. 2, a is the memory management means 12
b is a data storage area of the teletext number & [lA formed by combining small blocks of data storage memory a by the memory management means 12, This is a data storage area of teletext number &llB formed by combining small blocks of storage memory a. Since the teletext program A and the teletext program B have different data sizes, the data storage areas and the data storage areas C also differ in size.

FIG. 3 is an operational flowchart of the memory provisioning means 14 of this embodiment. The memory assigning means stores in the RAM 4 the number of the program to which a data storage area has already been assigned.When a 0 character broadcast program is received, the memory assigning means reads the number, and then stores the number of the program to which the data storage area stored in the RAM 4 has already been assigned. compare. If a data storage area has already been assigned, the received data is stored in the corresponding data 4M product area. If a data storage area has not been assigned yet, assign a data storage area, store data, and send the program number to RA.
M44 is memorized. By repeating this operation, a different data storage area can be provided for each teletext program. Further, the size of each data storage area is set to the minimum necessary size by the memory management means 12.

As described above, according to this embodiment, the data storage memory 1
1, memory management means 12, and memory provision means 13, it is possible to store text and graphic information of all pages of all programs using the minimum required memory capacity.

Note that the memory providing means 13 may provide different data storage areas to all teletext programs broadcast on a single television channel, or may assign different data storage areas to all teletext programs broadcast on a plurality of television channels. It is also possible to assign different data storage areas to different data storage areas.

Effects of the Invention As described above, the present invention includes a memory for storing text/graphic information of a received teletext program, and a memory that is divided into small blocks and combined with the small blocks according to the data size of the teletext program. By providing a memory management means for forming a data storage area for each teletext program, and a memory allocation means for allocating a different data storage area for each teletext program, the storage of text and graphic information on all pages of all programs can be kept to the minimum necessary. This can be done with a limited amount of memory.

[Brief explanation of the drawing]

FIG. 1 is a functional block diagram of a teletext receiver according to an embodiment of the present invention, FIG. 2 is an explanatory diagram of the operation of a memory management means according to an embodiment of the present invention, and FIG. 3 is a functional block diagram of a teletext receiver according to an embodiment of the present invention. FIG. 4 is a functional block diagram of a conventional teletext receiving apparatus. 2...Microprocessor circuit, 11...
. . . Data storage memory, 12 . . . Memory management means, 13 . . . Memory provision means.

Claims (3)

[Claims] (1) A memory that stores the text and graphic information of the received teletext program, and a memory that divides the memory into small blocks and combines the small blocks according to the data size of the teletext program to form a data storage area. What is claimed is: 1. A teletext receiving apparatus comprising: a management means; and a memory provision means for assigning different data storage areas to each teletext program. (2) The teletext receiving apparatus according to claim 1, wherein the memory provision means assigns different data storage areas to all teletext programs broadcast on a single television channel. . (3) The teletext receiving apparatus according to claim 1, wherein the memory providing means assigns different data storage areas to all teletext programs broadcast on a plurality of television channels.