JP3310974B2 - Teletext receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to a teletext receiving apparatus having a page memory for storing a program in page units, and in particular, can smoothly perform a page search operation. The present invention relates to a teletext receiving apparatus configured as described above.

(Prior Art) Teletext broadcasting is a system for repeatedly transmitting various types of teletext programs in the form of digital signals during a specific horizontal scanning period of a vertical retrace period of a television signal. The receiving side is provided with a buffer memory for taking in the teletext data, and the teletext data is sequentially written into the buffer memory. Then, the receiver specifies the program number of the desired program using a keyboard or the like, and the specified program is retrieved from the buffer memory, and the subsequent data of the program is transferred to the display memory and presented. It can be performed.

In such a receiving system, when the number of programs increases, the time required to transmit all programs becomes longer, and the waiting time until the designated program is presented on the screen becomes longer. Therefore, conventionally, a page memory for storing text broadcast data for a plurality of screens is provided, and the program desired by the receiver is stored in the form of program number registration, thereby eliminating the waiting time.

FIG. 4 is a memory map showing the operation of the page memory. FIG. 4 (a) shows the order of receiving teletext data (the order in which the data is held in the buffer memory). Now, in the case of registering the programs of the program numbers 0/012, 0/013, 0/014, 0/015,..., The data of each registered program is one page at a time as shown in FIG. They are stored in the page memory in the order in which they were received. When the time further elapses, the page memory is rewritten with data as shown in FIG. 4 (c). The bold line indicates this rewriting time. Therefore, the program secured in the page memory at each rewriting time can be presented without waiting time. Further, in the case of a program having a multi-page structure, even if the program is not stored in the page memory, the stored portion is presented without a waiting time, and data of the unregistered page is transmitted during that time. Then, the entire program can be received and presented without waiting time.

On the other hand, the character multiplexed signal written in the buffer memory is subjected to processing such as error correction. At this time, since the character multiplex signal determined to be a signal error is not stored in the page memory, it is stored in the page memory as incomplete page data with some data missing. Therefore, there is a problem that if the missing page data is presented, it is not presented correctly, and only an incomplete page can be presented to the recipient.

(Problems to be Solved by the Invention) As described above, conventionally, due to a character multiplex signal reception error,
Incomplete page data with some data stored in page memory missing may be presented, in which case it will be an unfinished unsightly page, and in order to present a page without errors, the next same page without errors Required a waiting time before re-receiving.

Therefore, the present invention is to improve the above problem,
The page data determined to have a data error in the page memory is deleted, and when presenting the page, the old page data stored in the page memory is searched and presented, and the newly received data is received in the erased memory area. It is an object of the present invention to provide a teletext receiving device in which data is written.

[Constitution of the Invention] (Means for Solving the Problems) The present invention has a page memory which fetches teletext data in a television broadcast signal and stores it as page data in page units, and specifies a program number. In a teletext receiver for transferring and presenting program data registered in the page memory to a display memory, a page data total number storage unit for storing a total number of page data of programs stored in the page memory; Receiving error discriminating means for discriminating a page-by-page receiving error from the total number of page data stored in the means, and when the receiving error discriminating means determines that there is an error per page, the reception error is stored in the page data total number storing means. Error page area erasing means for erasing a page area of a corresponding page based on data Than it is.

Further, it is provided with a page memory storage means for storing the next received page data in the erased page area of the page memory.

The receiving error determining means refers to a means for determining a total data error of a page unit by referring to a set value of DGS (data group size) and confirming the total number of page data of the received page.

Further, the present invention has a page memory for taking in teletext data in a television broadcast signal and storing the page data as page data in page units, and displaying a program data registered in the page memory by designating a program number. In the teletext receiving apparatus, the total number of page data stored in the page memory is stored in the page data total number storing means for storing the total number of page data of the program stored in the page memory. Receiving error discriminating means for discriminating a page-by-page receiving error, and, if the receiving error discriminating means determines that there is an error per page, the page of the corresponding page based on the data stored in the page data total number storing means. Error page area erasing means for erasing an area.

(Operation) In the present invention, an error in the total number of data in page units is detected, and if an error is detected in the data in page units stored in the page memory, the erroneous page area is erased and the erased page area is deleted. Is to write newly received data so that error-free program data can be presented.

(Example) Hereinafter, the present invention will be described based on an illustrated example.

FIG. 1 is a block diagram showing one embodiment of a teletext receiving apparatus according to the present invention.

In FIG. 1, 11 is a television antenna, 12 is a tuner, 13 is a video detection circuit, a high-frequency signal induced in the antenna 11 is received by the tuner 12 as an intermediate frequency signal of a desired channel, and the output of the tuner 12 is The image enters the image detection circuit 13 and is detected. Note that the tuner 12 is controlled by a tuning voltage from the tuning control circuit 14 so as to receive a signal of a desired channel.

On the other hand, reference numeral 15 denotes a data fetch circuit for extracting teletext data, temporarily correcting the error after correcting the error, and having a buffer memory for temporarily storing the extracted teletext data. The output end of the data acquisition circuit 15 is a data bus
Connected to 19.

The CPU 16, the RAM 17, and the ROM 18 are central processing circuits that execute a search (reception process) and a presentation process of the data stored in the buffer memory. Reference numeral 20 denotes a display control circuit controlled by the CPU 16. The display control circuit 20 is transferred with the program data of the desired program number detected by the search processing from the data capturing circuit 15, presents the transferred data, writes it to the display memory 21, and writes the written data to a predetermined memory. Is displayed during the period.
Reference numeral 22 denotes a keyboard such as a remote controller, which supplies key input data for receiving a desired channel to the tuning control circuit 14 by operating a predetermined key, and supplies a CPU 16 with a text broadcast program number to be received.

Reference numeral 23 denotes a page memory configured by a memory that stores a large number of pages. This page memory 23 is controlled to store data for each teletext program,
Each program data is written in a predetermined program memory area. Also, programs can be registered separately for each channel. The RAM 17 is provided with a program number and a registration area for receiving channel data for broadcasting the program, corresponding to each program memory area. These reception channel data and program number data can be input by key operation from the keyboard 22.

FIG. 2 is an explanatory diagram for explaining the write operation of the page memory 23. 2A shows the reception order of program data, and FIG. 2B shows a map of the program memory "1". Although the page memory 23 has an area for storing n (n is an arbitrary integer) programs, only the operation of the program memory "1" is shown here. The page memory 23 according to the present embodiment divides the entire area into n program memory areas, and divides each of the divided area memories “1”, “2”, “3”, Using "4",..., Memory "n", the program to be stored in each memory is specified in the form of program number specification by operating the keyboard 22, and when the specified program is received, the storage is performed. The starting address (address), the superimposed H data, the service identification (SI) data, and the total number of page data (DGS) are stored in the RAM 17, and the subsequently received page data is stored in the corresponding page data area (hereinafter, referred to as each page memory area). Simply stored in the page area). When there is no more free space in each memory, the process returns to the top of the memory area to store the latest page data. The total number of page data (DGS) means the number of data (that is, the number of bytes or the number of bits) constituting the page data.

Here, the total page data (DGS) stored in the RAM 17
Is subtracted each time a data block of page data is written to each page area, and when the last part of the page data is received or the beginning of the next page data is received, the total number of page data (DGS ) Is "0", it is determined that there is no reception error in the stored page unit when it is "0", and it is determined that there is a reception error in the stored page unit when it is "other than 0". The page data determined to have a page-by-page reception error is erased from the page address from the start address of the corresponding page stored in the RAM 17, and the next received page data is stored from the start address.

More specifically, the program number 0/010 # is registered in the memory “1” of the page memory 23. This program is registered in advance in the form of number designation by operating the keyboard 22. When the packet data of the registered program number (0/010 #) is held in the buffer memory, it is sequentially stored in the address area of the memory “1”. In FIG. 2, (b) shows the data stored in the memory "1" at the receiving point of (a).
In (b), at the end of the second page data reception of page 02, it is determined that there is an error in the total number of pages, so the corresponding page area is deleted, and the next received page 03 is stored following page 01. . So at this point the page
When presenting 02, the first stored data is searched for.

Here, whether or not the packet held in the buffer memory of the data acquisition circuit 15 is a registered program is determined by a program data header (PRCI) and a page data header (PACI).
The CPU 16 makes a determination based on such data identification data.

FIG. 3 is a flowchart showing a page data storage operation performed by the CPU 16 in FIG. When new data is received in the buffer memory (step S1: YES)
In step S2, error correction processing is performed on the received data stored in the buffer memory, and it is determined that there is no error (step S2).
(S3: NO), the content of the buffer memory is determined to be data identification data (PRCI, PACI) in step S4. If the data is data identification data, the program number in the data identification data is set to the registered program in step S5. In the case of a registered program, it is determined in step S7 whether or not the total page data (DGS) of the corresponding memory held in the RAM 17 is "0".
If "0" (NO), the process proceeds to step S9, and if "other than 0", the process proceeds to step S8.

Step S8 is a reception error of the total number of page data stored before, the data in the corresponding page area is erased, and the erased top address is set as the next page data write start address. Here, the corresponding page area is from the write start address held in the RAM 17 to the address where the final data is stored.

In step S9, the write address data at the top of the page, the superimposed H data, the service identification data, and the total number of page data are held in the corresponding area of the RAM 17.

In step S10, the received data of the buffer memory is written to the corresponding area of the page memory.

In step S11, the page memory write address is updated, and the page data total number (DGS) is incremented by 1 (DGS = DG
S-1) Store in RAM17.

In step S6, if there is a stored page memory,
The superimposed H data and service identification data held in the RAM 17 are compared with the data identification data other than the received registered program, and when the data match, the corresponding superimposed H data and service identification data held in the RAM 17 are compared. And the write operation to the page memory is interrupted.

In step S12, a search is made for a page memory that matches the buffer memory in which the superimposed H data and the service identification data of each page memory stored in the RAM 17 have been received, and if there is a corresponding page memory, the flow proceeds to step S10.

When new data is not received in step S1 or when there is an error in step S3, when there is no corresponding page memory in step S12, and after the processing in step S6 or step S11 is completed, Then, the process returns to the start and enters the reception standby state.

[Effects of the Invention] As described above, according to the present invention, a means for counting the total number of data in page units of each program is provided, and the presence or absence of an error in the total number of data in page units is always determined based on the counting result. The page memory always stores data without reception errors, and the data without reception errors can be presented without waiting time.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of a teletext receiving apparatus according to the present invention, FIG. 2 is a memory map for explaining a write operation of the page memory shown in FIG. 1, and FIG.
FIG. 4 is a flowchart showing the write operation of the page memory, and FIG. 4 is a memory map for explaining the operation of the conventional page memory. 15 Data capture circuit, 16 CPU, 17 RAM, 18 ROM, 19 Data bus, 20 Display control circuit, 21 Display memory, 22 Keyboard, 23 Page memory

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04N ⁷ /00-7/088 H04L 13/00-13/18 H04L 1/00 H04L 1/08-1 / twenty four

Claims (3)

(57) [Claims] The present invention has a page memory for fetching teletext data in a television broadcast signal and storing the page data as page data in page units. By designating a program number, program data registered in the page memory is stored in a display memory. In a teletext receiver for transferring and presenting, a total number of page data storing means for storing a total number of page data of a program stored in the page memory; Receiving error determining means for determining an error; and an error for erasing a page area of a corresponding page based on data stored in the page data total number storing means when the receiving error determining means determines that there is an error per page. A teletext receiving apparatus comprising: a page area erasing unit. 2. A page memory for fetching text broadcast data in a television broadcast signal and storing the page data as page data in page units. By designating a program number, program data registered in the page memory is stored in a display memory. In a teletext receiver for transferring and presenting, a total number of page data storing means for storing a total number of page data of a program stored in the page memory; Receiving error determining means for determining an error, and when the receiving error determining means determines that there is an error per page, a corresponding page area of the page memory is stored based on the data stored in the page data total number storing means. Page area erasing means for erasing; And a page memory storing means for storing the data in the erased page area of the memory. 3. A page memory for fetching teletext data in a television broadcast signal and storing the page data as page data in page units, and by specifying a program number, the program data registered in the page memory is stored in a display memory. In the teletext receiving apparatus for transferring and presenting, a total number of page data storing means for storing a total number of page data of a program stored in the page memory, and a last page of the total number of page data stored in the total number of page data storing means. A reception error discriminating means for discriminating a page-based reception error, and a page area of a corresponding page based on data stored in the page data total number storage means when the reception error discrimination means determines that there is an error per page. Character broadcast receiving device, comprising: .