JPH06233261A - Program updating method for teletext receiver - Google Patents

Abstract

PURPOSE:To rewrite page data on the basis of stored update time. CONSTITUTION:This method is constituted of a tuner part 1 to receive and demodulate a desired television channel and output a video signal, a signal extracting part 2 to extract a teletext signal superposed on the prescribed scanning line of the video signal and correct its error, a signal processing part 3 to decode inputted packet data on the basis of control data and generate the pagedata, a memory part 4 for display to store the page data for display in the form of image data, an output part 5 to output a character signal, a channel selecting part 7 to switch the tuner part 1, a timer/clock part 8, an arithmetic part 9 to calculate a program update period from the difference of start time, a comparing part 10 to check the change of an update flag, a memory part 11 to store all the code data of a teletext program and the channel number, the start time, the update period, and the update flag of the television of the teletext program as relating these with the page data, and a control part 12 to control each part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a program updating method for a teletext receiver, which eliminates the "waiting time" for screen display and makes the display screen the latest contents.

[0002]

2. Description of the Related Art Conventionally, when selecting a teletext program,
There is a so-called "wait time" for screen display from the completion of the selection operation until the program is displayed, which makes the teletext receiver unusable. As a countermeasure for that, when the television is not being watched, the tuner is switched at a predetermined time interval in advance, and the character program of each television channel is taken in.
Products have been developed that eliminate the waiting time by the method of storing in the page memory. However, although the conventional method can eliminate the waiting time, when watching a certain character program and selecting a character program of a different channel, the character broadcast data stored in the page memory is the latest. Since it may not be data, it may be a problem particularly when the contents of the called display screen are old (not updated) in some programs such as programs related to stocks.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and eliminates the "wait time" of screen display, stores the latest update data, and displays the data. An object of the present invention is to provide a program update method for a broadcast receiver.

[0004]

In order to achieve the above object, a tuner section for receiving a desired television channel, demodulating and outputting a video signal, and a character superimposed on a predetermined horizontal scanning line of the video signal. A signal extracting unit that extracts and corrects an error in a broadcast data packet, a signal processing unit that decodes an input data packet based on control data to generate page data, and a program that stores image data generated based on the page data In a teletext receiver including a display memory section, an output section for outputting a character signal in a predetermined signal form, a tuning section for switching the tuner, and a control section for controlling each section, the telecast program number is represented. Code data, a channel number of a television on which the teletext program is broadcast, a start time of the teletext program, an update cycle, and A memory unit that stores the new flag together with the page data, a timer / clock unit that measures time and time, an arithmetic unit that calculates an update cycle from the difference in the start time of the same character program, and an update It is composed of a comparison unit for checking the change of the flag.

[0005]

With the above-described configuration, in the update cycle calculation mode, the tuner is switched at a predetermined time interval, for example, in the order of preset TV station numbers, and the designated program is repeatedly captured, and each time the program is captured. The start time and update flag are stored. When the second update flag of the same program changes, the program update cycle is calculated and stored by subtracting the first program start time from the program start time. In the data update mode, the next update time is calculated based on the update cycle of each designated program and the start time to be stored, the predetermined channel is switched at the corresponding time, and the program data is updated and stored.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A program updating method for a teletext receiver according to the present invention will be described in detail below with reference to the drawings. Figure 1
It is a block diagram of the Example which performs the program update method of the teletext receiver by this invention. A tuner unit 1 receives a desired TV channel, demodulates it, and outputs a video signal.
Reference numeral 2 is a signal extracting unit for extracting a teletext signal superimposed on a predetermined horizontal scanning line of the video signal and correcting the error. A signal processing unit 3 decodes the input packet data based on the control data to generate page data. Reference numeral 4 denotes a program display memory unit that stores image data generated based on the page data. An output unit 5 outputs a character signal in a predetermined signal form. 7
Is a tuning unit that switches the tuner unit 1. Reference numeral 8 is a timer / clock section for measuring time and time. 9
Is a calculation unit that calculates the update cycle from the difference in the start time of the same text program. Reference numeral 10 is a comparison unit for checking a change in the text program update flag. Reference numeral 11 relates code data representing a program number of a teletext, a channel number of a television broadcasting the teletext program, a start time of the teletext program, an update cycle, and an update flag in association with the page data. It is a memory unit that stores both. Reference numeral 12 is a control unit that controls each unit.

The operation of the program updating method of the teletext receiver according to the present invention will be described. FIG. 2 is a time chart showing the operation of capturing a designated program in the program updating method of the teletext receiver according to the present invention. (A) The figure shows the operation of sequentially switching channels at predetermined time intervals. At the first time, the tuning unit 7 switches the tuner 1 to the A channel, and after a predetermined time measured by the timer / clock unit 8 has elapsed, switches to the B channel. Next, C channel, ..., Similarly, the second time, A channel,
.. are repeated in this order to switch the tuner 1 and store the teletext data of each channel as page data in the memory unit 11. The figure (b) shows the operation of repeatedly loading the text program a and the start time of each loading. For example, the first time is the start time t
Import from 1 and second from the start time t2,
.. At the k-th time, the import is started from the start time tk.

FIG. 3 is a data table stored in a memory unit for obtaining an update cycle based on a change in a program update flag and a start time of capturing a designated program in the teletext receiver according to the present invention. The first capture is at the start time t1,
At that time, there is no change in the update flag. There is no change in the second time as well. The third capture is at the start time t3, and the update flag is changed at that time (first update flag change).・
.. The nth capture is at the start time tn, and the update flag changes at that time (the second update flag change). The update cycle is calculated as tn-t3 from the difference between the start times when the update flag changes twice consecutively.

FIG. 4 is a flow chart for obtaining the update cycle of a designated program of the teletext receiver according to the present invention. A certain television channel is received, the designated character program is associated with the code data representing the program number of the program, and the start time and the update flag are stored together (S
TP1). The change of the update flag is checked by comparing with the previous value in the comparison unit 10, and the number of changes is stored in the memory unit 11 (STP2). If it is the second time (YES in STP3), it is determined whether the update flag has changed for the second time (STP3), and if it is the second time (YES in STP3), the start time at the time when the update flag is changed from the start time at this time is changed to the start time at this time. Is subtracted by the calculation unit 9, and the difference value is stored in the memory unit 11 in association with the code data of the corresponding program (STP).
4). The comparison unit 10 compares the predetermined time stored in the memory unit 11 with the time measured by the timer / clock unit 8 at the same time as the channel switching, and checks whether a predetermined time has elapsed. (STP5). When the predetermined time has passed (YES in STP5), the process is ended (the channel is switched). If the predetermined time has not elapsed (YES in STP5), the process returns to STP1. In addition, when no change has occurred or the first time (STP
If NO in 3), the process proceeds to STP5.

FIG. 5 is a time chart showing the update timing of the program data of the teletext receiver according to the present invention. Based on the update cycle of each program and the previously updated start time, update time data for each program is stored in the memory unit 11 together with the corresponding program code. Based on the above data, for example, the update of the program a1 switches the tuner unit 1 to the channel A at the time ta1 according to an instruction from the channel selection unit 7.
Next, at time tb1, the tuner unit 1 is switched to the channel B and the program b1 is updated. Hereinafter, similarly designated programs are sequentially updated.

[0011]

As described above, the present invention provides a program update method for a teletext receiver, which eliminates the "waiting time" for screen display, stores the latest update data, and displays the data. provide. Therefore, when the designated program is selected, the program is read from the memory unit and immediately displayed. The program data that is read is always the latest updated data.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of a program updating method of a teletext receiver according to the present invention.

FIG. 2 is a time chart showing the operation of capturing a designated program in the program updating method of the teletext receiver according to the present invention.

FIG. 3 is a data table stored in a memory unit for determining an update cycle based on a change in a program update flag and a start time of capturing a designated program in the teletext receiver according to the present invention.

FIG. 4 is a flowchart for obtaining an update cycle of a designated program of a teletext receiver according to the present invention.

FIG. 5 is a time chart showing update timing of program data of the teletext receiver according to the present invention.

[Explanation of symbols]

 1 Tuner section 2 Signal extracting section 3 Signal processing section 4 Display memory section 5 Output section 7 Tuning section 8 Timer / Clock section 9 Computing section 10 Comparing section 11 Memory section 12 Control section

Claims (2)

[Claims] 1. A tuner unit for receiving and demodulating a desired television channel and outputting a video signal, and a signal extracting unit for extracting and correcting an error of a teletext data packet superimposed on a predetermined horizontal scanning line of the video signal. A signal processing unit that decodes an input data packet based on control data to generate page data; a program display memory unit that stores image data generated based on the page data; and a character in a predetermined signal form. In a teletext receiver including an output section for outputting a signal, a tuning section for switching the tuner, and a control section for controlling each section, code data representing a program number of a teletext and the teletext program are broadcast. The TV channel number, the start time of the teletext program, the update cycle, and the update flag are related to the page data. A memory unit for storing both Te,
It comprises a timer / clock section for measuring time and time, an arithmetic section for calculating the update cycle from the difference in the start time of the same character program, and a comparison section for checking the change of the update flag. Based on this, the TV channel is switched, the specified teletext program is imported,
A program update method for a teletext receiver, characterized by updating page data. 2. The program updating method for a teletext receiver according to claim 1, which is combined with an external channel selection section and tuner section that can be remotely controlled.