JP2894136B2 - Teletext receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for updating a program in a teletext receiver in which the "wait time" of screen display is eliminated and the display screen has the latest contents.

[0002]

2. Description of the Related Art Conventionally, when selecting a teletext program,
There is a so-called "waiting time" on the screen from the completion of the selection operation until the program is displayed, which makes the teletext receiver difficult to use. As a countermeasure method, the tuner is switched in advance at a predetermined time interval at a time when the user is not watching the television, and the text program of each television channel is captured
Products with no waiting time have been developed by storing them in a page memory. However, in the conventional method, although the waiting time can be eliminated, when watching a text program and selecting a text program of a different channel, the text broadcast data stored in the page memory is updated with the latest text data. Since the data may not be data, a problem may occur particularly when the content of the called display screen is 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 "waiting time" on the screen display, stores the latest updated data, and displays the data. An object of the present invention is to provide a method of updating a program of a broadcast receiver.

[0004]

In order to achieve the above object, a tuner section for receiving and demodulating a desired television channel and outputting a video signal, and a character superimposed on a predetermined horizontal scanning line of the video signal are provided. a signal extraction unit for error correction takes the data packets of a broadcast, a signal processing unit for generating the decoded page data based the de <br/> Tapaketto inputted to the control data from the control unit, generated based on the page data A memory for displaying a program storing the selected image data, an output unit for outputting a character signal of the image data in a predetermined signal form, a tuning unit for switching the tuner, and a control unit for controlling each unit. In the teletext receiver, code data representing a teletext program number, a channel number of a television on which the teletext program is broadcast, Broadcast start time of the character broadcast program (hereinafter referred to the start time), and an update period and the update flag, and a memory unit for storing together related to the page data,
A timer / clock section for measuring the channel switching time and the start time, and two consecutive update files of the same character program
A calculation unit for calculating an update cycle from the difference between the respective start times at the change of the lug, on the basis of the update flag, and a comparator unit for checking the change.

[0005]

With the above configuration, in the update cycle calculation mode, the designated program is repeatedly fetched while switching the tuners at predetermined time intervals, for example, in the order of preset TV station numbers. The start time and the update flag are stored. When the second update flag of the same program changes, the program update period 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 specified update cycle of each program and the storage start time, a predetermined channel is switched at the corresponding time, and the program data is updated and stored.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a method for updating a program of a teletext receiver according to the present invention. FIG.
FIG. 3 is a block diagram of an embodiment for performing a program updating method of a teletext receiver according to the present invention. A tuner 1 receives and demodulates a desired television channel and outputs a video signal.
Reference numeral 2 denotes a signal extracting unit for extracting a teletext data packet superimposed on a predetermined horizontal scanning line of the video signal and correcting the error. 3 decodes basis of the data packet to the control data is a signal processing unit that generates 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 of the image data in a predetermined signal form. Reference numeral 7 denotes a tuning unit for switching the tuner unit 1. 8 is a timer / clock unit for measuring a <br/> and between the start time when cut conversion example of the channel.
Reference numeral 9 denotes a calculation unit that calculates an update cycle from a difference between start times of the same text program. Reference numeral 10 denotes a comparison unit that checks a change in the text program update flag. 11 is code data representing a teletext program number, a channel number of a television on which the teletext program is broadcast, a start time of the teletext program,
A memory unit for storing an update cycle and an update flag in association with the page data. A control unit 12 controls each unit.

The operation of the method for updating a program of a teletext receiver according to the present invention will be described. FIG. 2 is a time chart showing an operation of capturing a designated program in the program updating method of the teletext receiver according to the present invention. (A) shows an 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 switches to the B channel after a predetermined time measured by the timer / clock unit 8 elapses. Next, the C channel,...
The tuner 1 is switched, and the teletext data of each channel is stored in the memory unit 11 as page data. (B) The figure shows the operation of repeatedly capturing the text program a and the start time of each capture. For example, the first time is the start time t
The second time is taken from the start time t2,
.. At the k-th time, the capture starts 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 of a program update flag and a designated program fetch start time of a teletext receiver according to the present invention. The first capture is the start time t1,
At that time, there is no change in the update flag. There is no change in the second time. The third capture is at the start time t3, at which time the update flag is changed (first update flag change).・
... The n-th fetch is at the start time tn, at which time the update flag changes (the second update flag changes). The update cycle is determined as tn-t3 from the difference between the respective start times when the update flag changes two consecutive times.

FIG. 4 is a flowchart for obtaining the update cycle of a specified program in the teletext receiver according to the present invention. A certain television channel is received, the specified character program is associated with 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 it with the previous value in the comparing unit 10, and the number of times of the change is stored in the memory unit 11 (STP2). It is determined whether the update flag has changed for the second time (STP3). If the change has been performed for the second time (YES in STP3), the start time from the previous change time of the update flag stored in the memory unit 11 to the current start time Is subtracted by the operation 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 comparing 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). If the predetermined time has elapsed (YES in STP5), the processing ends (channel switching). If the predetermined time has not elapsed (YES in STP5), the process returns to STP1. Also, when no change has occurred or the first time (STP
In the case of NO at 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. On the basis of the above data, the channel selecting unit 7, the signal extracting unit 2,
By controlling the signal processing unit 3, for example, the program a1
Is updated by switching the tuner unit 1 to channel A at the time ta1 according to the instruction of the tuning unit 7. Next, at time tb1, the tuner unit 1 is switched to channel B, and the program b1 is updated.
Then, it is stored in the memory unit 11 . Hereinafter, similarly designated programs are sequentially updated and stored in the memory unit 11 .

[0011]

As described above, the present invention eliminates the "waiting time" of the 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 read program data is always the latest updated data.

[Brief description of the drawings]

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

FIG. 2 is a time chart showing a fetch operation of 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 obtaining an update cycle based on a change of a program update flag and a start time of a designated program taken by a teletext receiver according to the present invention.

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

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tuner part 2 Signal extraction part 3 Signal processing part 4 Display memory part 5 Output part 7 Tuning part 8 Timer / clock part 9 Operation part 10 Comparison part 11 Memory part 12 Control part

Claims (2)

(57) [Claims] 1. A tuner section for receiving and demodulating a desired television channel to output a video signal, and a signal extracting section for extracting a teletext data packet superimposed on a predetermined horizontal scanning line of the video signal and correcting the error. When, a signal processing unit for generating the decoded page data based the data packet input to the control data from the control unit, and the display memory section of the program for storing the image data generated based on the page data, wherein In a teletext receiver including an output unit for outputting a text signal in a predetermined signal form of image data, a tuning unit for switching the tuner, and a control unit for controlling each unit, a text broadcast program number , The channel number of the television on which the teletext program is broadcast, the broadcast start time of the teletext program, the update cycle, And an update flag in association with the page data, a timer / clock unit for measuring a channel switching time and a broadcast start time, and two consecutive characters of the same character program.
A calculation unit for calculating the respective differences from the update period of the broadcast start time of the time change of times update flag of, based on the update flag
And a comparison unit for checking the change. Based on the broadcast start time and the update cycle, the control unit
By controlling through the switching TV channels, captures the designated character broadcasting program, teletext receiver characterized by updating the page data. 2. The teletext receiver according to claim 1, wherein the teletext receiver is combined with an external tuner and a tuner that can be remotely controlled.