JPH06205355A - Teletext broadcast data recording method - Google Patents

Abstract

PURPOSE:To prevent program data with less total page numbers from being erased from a memory to record program data with many total page numbers at the time of an end of teletext broadcast. CONSTITUTION:A tuner section 1 receives a television signal demodulates the signal into a composite video signal, a telelext extract section 2 extracts a broadcast signal and the signal is stored in a memory section 3. The broadcast signal stored in the memory section 3 is read by a control section 9 and decoded into a required teletext signal by a decode section 7 and the signal is displayed on a screen by a display section 8. The number of program of the teletext broadcast extracted by the teletext extract section 2 is counted by a program number counter section 4 and it is inputted to a discrimination section 6 by the control section 9 and compared with a set value being the number of programs read from the storage section 5, and when the number is equal to the set number or below, on discrimination output is outputted, and program data write in the memory section is stopped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for recording teletext data, and more particularly to a method for recording teletext program data at the end of teletext.

[0002]

2. Description of the Related Art In a teletext program transmitted by being superimposed on a television broadcast signal, one program has a minimum number of pages of 1 page to a maximum of 99 pages. When a large number of programs having different numbers of pages are broadcast, the transmission side manages so that the last page of each program is transmitted and the broadcast is terminated at the end of the character broadcast. That is, the program is sequentially terminated from the program having the smallest number of pages, and finally the last page of the program having the largest number of pages is transmitted to terminate the character broadcasting. On the other hand, the teletext receiving side records the teletext signal extracted from the composite video signal in a memory (program memory). When the program data is recorded by the conventional recording method, for example, the memory is a ring buffer format. If the storage capacity of the program is relatively small and the transmission of the program data is completed at the end of the character broadcasting and the writing to the memory is completed, all or part of the program data with a small number of pages is input later. It is erased for recording the program data having a large number of total pages. This can be solved by using a memory for recording programs, for example, by channels, by program numbers, or by dividing into reserved programs / non-reserved programs. There is a problem that a large memory is required.

[0003]

SUMMARY OF THE INVENTION In view of the above, the present invention is to broadcast character programs of various page numbers in a mixed manner from one with many pages to one with few pages, and the character broadcasting ends. At the same time, it is another object of the present invention to provide a teletext data recording method capable of leaving data of a program having a small number of pages without increasing the capacity of the program memory.

[0004]

In order to solve the above problems, the present invention provides a tuner section for receiving a television broadcast and demodulating it into a composite video signal, and a character broadcasting signal from the composite video signal demodulated by the tuner section. A character extraction unit for extracting the data, a memory unit for recording data from the character extraction unit, a decoding unit for decoding the character broadcasting signal read from the memory unit into a display signal, and a display for displaying the signal from the decoding unit. Section, a program number counting section that counts the number of programs from the character extraction section, a storage section that stores a set value of the program number, and the data from the program number counting section is compared with the data read from the storage section and the results match. And a control unit that controls the tuner unit, the character extraction unit, the memory unit, the decoding unit, the display unit, the program number counting unit, the storage unit, and the determination unit, and a signal from the determination unit. Based on Character broadcast data recording method so as to stop writing data to the memory portion Te and it provides a.

[0005]

With the above construction, in the teletext data recording method according to the present invention, when a plurality of teletext programs having different total pages are being broadcast, a program with a small number of pages is displayed at the end of the teletext. When the character broadcasting ends in sequence and the number of remaining character programs continuing to be broadcast reaches the set number of programs, writing of the character broadcasting signal to the memory section is stopped, or the following data is stored in the auxiliary memory. Make a record in the department.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a teletext data recording method according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a block diagram of essential parts of an embodiment of a teletext data recording method according to the present invention. In the figure, reference numeral 1 denotes a tuner section which receives a television broadcast and demodulates it into a composite video signal. A character extraction unit 2 extracts a character broadcast signal (program data) superimposed on the composite video signal from the tuner unit 1. Reference numeral 3 is a memory unit for recording the character broadcast signal from the character extracting unit 2. A program number counting unit 4 counts the number of programs of the teletext signal extracted by the character extracting unit 2. A storage unit 5 stores a set value of the number of programs. 6 is a discriminator, which compares the data from the program number counter 4 with the data read from the memory 5,
When the count value is less than the set number, a signal is output, and writing of the teletext signal to the memory unit 3 is stopped. A decoding unit 7 decodes the teletext signal read from the memory unit 3 into a required text signal. A display unit 8 displays the character signal from the decoding unit 7 on the screen. A control unit 9 controls each unit.

FIG. 2 is a block diagram of the essential parts of another embodiment of the method for recording teletext data according to the present invention. Reference numerals 1 to 9 in the figure are the same as those in FIG. Reference numeral 10 denotes an auxiliary memory unit, which records the subsequent program data in response to the stop of the writing of the program data in the memory unit 3 at the end of the character broadcasting.

Next, the operation of the teletext data recording method according to the present invention will be described. First, in the case of FIG. 1, the tuner unit 1
It receives a television broadcast signal and demodulates it into a composite video signal. The composite video signal from the tuner unit 1 is input to the character extraction unit 2, the character broadcast signal is extracted and recorded in the memory unit 3 via the control unit 9. In the case of teletext, if the number of programs to be broadcast is n, first, the first page of program number 1,
Next, the first page of the program number 2, ..., The first page of the program number n is sequentially transmitted, then the second pages of the program numbers 1 to n are sequentially transmitted, and the program number 1 to The third page of the n-th page is transmitted as shown in the following. While the data transmission of all pages of a program with a large number of pages completes one cycle,
In a program with a small number of pages, the data of the same page will be repeatedly transmitted. And at the end of the teletext,
Since the character broadcast signal transmission side manages to transmit the data up to the last page of each program and terminate the broadcast,
The transmission of the final page data ends earlier for a program with a smaller number of pages, and thereafter, the remaining page data of a program with a large number of pages continues to be transmitted.

On the receiving side, these program data are extracted by the character extracting section 2 and recorded in the memory section 3. Memory part 3
The teletext signal recorded in is read out in accordance with the required program number and page selection operation, is input to the decoding unit 7 via the control unit 9, is decoded into the required character signal, and is displayed by the display unit 8 on the screen. To display. The number of programs of the character broadcasting extracted by the character extracting unit 2 is counted by the program number counting unit 4 via the control unit 9. For this counting, for example, a program number table is created in the program number counting unit 4 based on the program index data header data (PICI) of the teletext signal or the data header data (PRCI), and the program number of this program number table is created. To count the number of programs in which the program data is continuously transmitted, or
Among the program numbers of C or PRCI, the number of programs for which program data continues to be transmitted is counted. On the other hand, the storage unit 5 stores the set value of the number of programs.
The data from the program number counting unit 4 is input to the discriminating unit 6 via the control unit 9 and compared with the set value of the program number read from the storage unit 5 via the control unit 9 to obtain the value from the program number counting unit 4. When the value becomes less than or equal to the set value from the storage unit 5, a signal is output.
Based on the signal from the discriminating unit 6, the writing of the program data to the memory unit 3 is stopped.

Accordingly, when the storage capacity of the memory unit 3 is smaller than the data amount of all the teletext signals, the transmission of the teletext signals is sequentially ended from the text program having the smaller total number of pages at the end of the text broadcasting. Since the writing of data to the memory unit 3 is stopped during the data transmission of the text program which is being transmitted because of the large number of pages, the data of the subsequent pages will not be recorded. Some program data having a small number do not have to be erased from the memory unit 3.

In the case of FIG. 2, in response to the stop of writing to the memory section 3 described above, the subsequent program data is written to the auxiliary memory section 10. As a result, not only the program data having a small total number of pages need not be erased, but also program data having a large total number of pages can be recorded. Moreover, since the auxiliary memory unit 10 only records the program data of the remaining portion of the character program having a large number of pages, it does not require a large capacity.

[0012]

As described above, according to the teletext data recording method of the present invention, when a teletext signal is recorded in a memory having a relatively small recording capacity, such as a ring buffer format, at the end of the teletext. , Program data with a small total number of pages is not erased from the memory due to recording of program data with a large total number of pages, and an auxiliary memory with a relatively small storage capacity is added, and the total number of pages is set in this auxiliary memory. It is possible to record most of the entire program data by recording the remaining part of the program data with a large number of cases, and there are many opportunities to listen to the character broadcast recorded in the memory after the completion of the character broadcast. And so on.

[Brief description of drawings]

FIG. 1 is a block diagram of a main part of an embodiment of a teletext data recording method according to the present invention.

FIG. 2 is a principal block diagram showing another embodiment of the teletext data recording method according to the present invention.

[Explanation of symbols]

 1 Tuner part 2 Character extraction part 3 Memory part 4 Program number counting part 5 Storage part 6 Discrimination part 7 Decoding part 8 Display part 9 Control part 10 Auxiliary memory part

Claims (2)

[Claims] 1. A tuner unit for receiving a television broadcast and demodulating it into a composite video signal, and a character extraction unit for extracting a character broadcast signal from the composite video signal demodulated by the tuner unit.
A memory unit that records data from the character extraction unit, a decoding unit that decodes the character broadcast signal read from the memory unit into a display signal, a display unit that displays the signal from the decoding unit, and the character extraction unit. A program number counting unit that counts the number of programs, a storage unit that stores the setting value of the program number, a determination unit that compares the data from the program number counting unit with the data read from the storage unit, and determines whether they match. A tuner unit, a character extraction unit, a memory unit, a decoding unit, a display unit, a program number counting unit, a storage unit, and a control unit for controlling the discriminating unit, and program data to the memory unit based on a signal from the discriminating unit. A method of recording teletext data that stops writing. 2. The teletext data recording method according to claim 1, wherein an auxiliary memory unit is provided, and the subsequent data is recorded in the auxiliary memory unit in response to the stop of writing data to the memory unit. .