KR930006532B1 - Autocontrol method of teletext tv - Google Patents

Abstract

This invention is about regulating timing point judging wheather the sliced data is 1 or 0 in the teletext receiver. In the teletext receiver, it initializes at TV program receiving state using teletext after power on, next transfers to CPU by judging the state of sliced data inputted from data slice (2) at teletext processor (7) on the value of EEP ROM (12) in parallel, and comprises using main contents page of all transferred teletext data from teletext pre-processor (3) in parallel.

Description

Automatic Control of Data Discrimination Point in Teletext Receiver

1 is a block diagram of a conventional apparatus.

2 is a block diagram for explaining the operation of the present invention.

3 is a flow chart illustrating an operation relationship when power is turned on in the present invention.

4 is a flowchart illustrating an operation relationship in teletext mode in the present invention.

5 is a diagram showing timing delay values corresponding to EEPROM data in a timing table in the present invention.

* Explanation of symbols for main parts of the drawings

1: Image detector 2: Data slicer

3: Teletext Preprocessor

4: Video Signal Generator 5: Key Pad

6: preamplifier 7: CPU

8: slice timing point adjustment switch 9: program ROM

10: program RAM and video RAM 11: timing table

12: EEP ROM

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to timing point adjustment for discriminating sliced teletext data as 0 or 1 in a teletext receiver. In particular, the characteristics of the teletext receiver itself and the location and time at which the receiver is installed are provided. The present invention relates to an automatic control method for automatically and dynamically finding and storing optimal data discrimination points according to the transmission characteristics of teletext data, and extracting teletext data accordingly.

In the conventional apparatus, as shown in FIG. 1, the timing point adjustment switch 8 for teletext data determination is connected to the CPU 7 so that the CPU 7 switches when the teletext receiver is reset after the power is turned on. Reads the on and off states of the data, finds the actual data discrimination point adjustment value of this combination, and sends it to the teletext preprocessor 3, which in the data slicer 2 The slid and input signal is discriminated to 0 or 1 with a time delay according to the data discrimination timing point value, and the discriminated data are output in parallel to the CPU 7.

However, the above-mentioned conventional apparatus has a problem of failing to reflect the characteristics of a signal according to a region and not having an optimal data determination capability since it is manufactured and fixed at the time of data discrimination point adjustment switch. Due to the difference in signal characteristics of each broadcasting station, it is difficult to find the optimal data discrimination point considering the regional and time signal characteristics and the characteristics of each set, and the correction point must be corrected by disassembling the receiver and adjusting the switch. This was not an easy problem.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the receiver can find an appropriate data discrimination timing point according to the characteristics of the receiver itself, the place where the receiver is installed, the reception time, and the signal characteristics of the reception broadcasting station. To maintain an optimal reception state as described above according to the accompanying drawings as follows.

As shown in FIG. 2, in the conventional circuit, the timing table 11 and the slice timing adjustment circuit function for optimal teletext data reception are performed without connecting the slice timing point adjustment switch 8 to the CPU 7 in the conventional circuit. The EEP ROM 12 is added.

The operational relationship of the present invention will be described with reference to FIGS. 3 and 4 as follows.

As shown in FIG. 3, when the power is turned on, the teletext receiver operates.

First, the state of the teletext is initialized to the TV program reception state.

Next, the value of the EEP ROM 12 (see FIG. 5) is read, and the teletext preprocessor 3 determines the sliced data 1 or 0 state input from the data slicer 2 according to the value, and determines the aCPU ( 7) to be delivered in parallel.

At this time, the CPU 7 finds and configures a master index page among the teletext data transmitted in parallel from the teletext preprocessor 3.

If an error occurs during configuration, count the number of error occurrences and check the number of error occurrences up to that point.

If the number of error occurrences exceeds the appropriate number (N), erase the EEP ROM, write data to indicate the new determination point adjustment value, and let the teletext preprocessor 3 operate according to the new determination point value. Repeat the page configuration again.

If an error occurs less than the proper number during the construction of the main contents page, wait for the user to enter the keypad.

If there is a change request of the TV channel, the process returns to the initialization state to find the sliced data determination point suitable for the characteristics of the station, and if the teletext mode selection key, the operation process as shown in FIG. 4 is performed.

That is, when the teletext mode is selected, the teletext receiver is first initialized to the teletext page processing state.

Next, the data discrimination value is outputted to the teletext preprocessor 3 according to the EEP ROM value to discriminate the sliced data as 1 or 0, and the parallel data is received therefrom.

Construct the requested teletext page among the data. At this time, if the number of error occurrences exceeds the appropriate number N during the construction of the requested page, the data according to the new determination point value is written to the EEP ROM, and it starts again from where the EEP ROM is read. If an error occurs less than the appropriate number of times during the requested page configuration, the page data is processed and displayed on the screen, and a new user enters a key pad.

If the TV channel change or TV mode selection is requested, the operation of FIG.

As described above, according to the present invention, a suitable data discrimination time point can be found by the receiver itself according to the characteristics of the receiver itself, the place where the receiver is installed, the reception time, and the signal characteristics of the reception broadcasting station. The most optimal state of reception can be performed automatically.

Claims (1)

In a teletext receiver, after the power is turned on, the teletext state is initialized to a TV program reception state, and then the data of the EEP ROM 12 is read and data is read from the teletext processor 3 according to the value. Determine the sliced data 1 or 0 input from the slicer 2 and pass it to the CPU 7 in parallel, and find and configure the attention difference page among the teletext data transferred in parallel from the teletext preprocessor 3. If an error occurs during configuration, count the number of error occurrences and check the number of error occurrences up to that time.If the error occurrences exceed the appropriate number (N), erase the EEP ROM and display the data indicating the new determination point adjustment value. Write it, operate the teletext preprocessor 3 according to the new discrimination point value, and repeat the attention difference page configuration again. If an error occurs less than the proper number of times during the construction of the next page, the user waits for the keypad input. If the teletext mode selection key is used, the automatic adjustment method of data discrimination point in a teletext receiver performs a similar process to that of power-on.

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