JPH0426291A - Teletext receiver - Google Patents

Abstract

PURPOSE:To efficiently utilize a program memory in which teletext information is stored by providing a second storage control means to control whether storage by a first storage control means is to be executed or not according to the compared output of the calculated values of a first and a second arithmetic means. CONSTITUTION:The calculated values of the first and the second arithmetic means are compared with each other, and the second storage control means controls whether the storage by the first storage control means is to be executed or not according to the compared result of a comparing means. 'Page omission' apt to be caused when the memory capacity of the program memory 30 is not enough is prevented by the first and the second arithmetic functions, the comparing function, and the second storing function of a CPU 20 based on a program in a program ROM 26. Plural programs desired to store in the program memory 30 and plural programs desired to display by a display part 9 by paging automatically are set respectively in a timer 48, a storing program setting memory 44 and a displaying program setting memory 46. Thus, the teletext information can efficiently be utilized from the program memory.

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention stores teletext information of a plurality of programs desired to be displayed in a program memory, and displays the teletext information sequentially read from the program memory at a set time. This invention relates to a teletext receiver that can automatically turn pages at intervals and display them on a display unit, and that can efficiently utilize program memory.

``Prior Art'' In general, in one text broadcast, the transmission interval of one page is set at 20 to 30 seconds or less in consideration of reading time and other factors. Therefore, in conventional teletext receivers, even if a program or page is selected, it must wait for a certain period of time before it is displayed, and the page of the selected program is also turned every certain period of time t (for example, 20 seconds) determined by the transmitting side. That's all I could do. In addition, in order to be able to display the set program as soon as it is selected, the receiver is equipped with a program memory that stores teletext information for multiple programs.When a teletext program is selected, the teletext information for the corresponding program is displayed from the program memory. There was also a teletext receiver that read out the program, transferred it to the display memory, and displayed it on one display, but turning the pages of one selected program was done by a remote control or a push signal from a switch.

[Problem to be solved by the invention] However, conventional teletext receivers can only automatically turn pages for the selected program being received, and furthermore, the page turning is determined by the broadcast transmitter. There is a problem in that the page turning can only be done every fixed time t (for example, 20 seconds), and the receiving side cannot freely set the time interval for page turning. Furthermore, even if you install a program memory that stores teletext information for multiple programs and try to automatically turn the pages of any selected program, it is inconvenient that you can only turn the pages manually using a remote control or switch. There was a problem that.

The present invention has been made to solve the above-mentioned problems, and it is possible to sequentially display teletext information of a plurality of pre-selected (set) programs by automatically turning the pages at arbitrary time intervals. As well as being able to.

It is an object of the present invention to provide a teletext receiver that can efficiently utilize a program memory that stores teletext information.

The present invention provides a teletext receiver that extracts teletext information from a received television signal, transfers it to a display memory, and displays it on a display unit. A program memory for storing broadcast information, a stored program setting means for setting a program to be stored in the program memory, and a stored program setting means for storing teletext information of the programs set by the stored program setting means in the program memory in the order of reception. a first memory control means; a display program setting means for setting programs to be sequentially displayed on the display section; a page turning time setting means for setting a time interval for page turning; program playback means for sequentially reading teletext information of the program set by the display program setting means from the program memory and transferring the teletext information of the program set by the display program setting means to the display memory; a first calculation means for calculating the time required from the time when the corresponding program is extracted from the received television signal until the time when the corresponding program is displayed on the display section by the program playback means; and the storage program setting means; a second calculating means for calculating the time required from the time when the set program is extracted from the received television signal until the time when the set program is stored in the program memory by the first storage control means; Comparison means for comparing the calculated values of the second calculation means, and second storage control means for controlling whether or not the first storage control means stores based on the comparison output of the comparison means. It is characterized by: In order to enable page-turning display of teletext information of programs spanning multiple television channels, the stored program setting means sets a plurality of programs spanning multiple television channels. A discriminating means for discriminating the TV channel of the program set by the discriminating means, and a channel control means for controlling the tuner circuit to select a corresponding channel based on the discriminating output of the discriminating means. Further, in order to reduce the memory capacity required for setting and to facilitate setting operations, the stored program setting means also serves as the display program setting means.

"Operation" The page turning time setting means, the stored program setting means, and the display program setting means set the page turning time interval T (for example, 7 seconds), select multiple programs to be extracted and stored, and automatically turn the page on the display section. Multiple programs to be displayed are set. The first storage control means extracts teletext information of the program set by the stored program setting means from the received television signal and stores it in the program memory in the order of reception. When automatic page turning is selected, the teletext information of the program set by the display program setting means is read out from the program memory by the program playback means at every time interval T of page turning, and is transferred to the display memory and displayed. displayed in the section. Here, the first
The calculation means calculates the time required from the time the teletext information of the display program is received until the time it is displayed, and the second calculation means calculates the time required from the time the teletext information of the display program is received until the time it is stored. The comparison means compares the calculated values of the first and second calculation means, and the second storage control means controls whether or not the first storage control means stores based on the comparison output of the comparison means. Therefore, when teletext information of a displayed program is received, whether or not to store it in the program memory is controlled depending on whether the time required from reception to display is shorter than the time required from reception to storage. Ru. That is, compared to the time required for storage, the received information for which there is enough time for five displays is not stored in the program memory, and only the received information for which there is no time for one display is stored in the program memory. A plurality of programs spanning a plurality of television channels are set in the stored program setting means, and a discriminating means for discriminating the television channel of the program set by the stored program setting means is provided, and a tuner circuit is provided with a discriminating output of the discriminating means. If the TV is configured to include channel control means for controlling channel selection, teletext information of programs spanning multiple television channels can be displayed by automatic page turning.

r Example” Hereinafter, one embodiment of the present invention will be described based on the drawings.

Figure 1 shows the main parts of a built-in teletext receiver in which a character signal processing circuit is built into the television receiver.
A tuner circuit that selects a predetermined TV signal from among the received TV signals and an IF that converts the frequency of the channel selection signal.
It consists of circuits and a detection circuit that detects the IF output and outputs a video signal. One of the output sides of the demodulator 1 is coupled to a video signal input terminal 7 of a teletext decoder 5. Reference numeral 9 denotes a display section composed of a video switching circuit, a video output circuit, a cathode ray tube, etc., and this display section 9 is connected to the other output side of the demodulation section 1 and the teletext decoder section 5.
is connected to the output side of the video output. The tuner circuit of the demodulator 1 is configured to be able to switch channels in response to a switching control signal from a CPU 20, which will be described later.

The teletext decoder section 5 is constructed as follows. That is, the video signal input terminal 7 is connected to a synchronization separation circuit 12 and also to an error correction circuit 18 via a waveform equalization circuit 14 and a character signal separation circuit 16. The synchronization separation circuit 12 includes the waveform equalization circuit 14, the character signal separation circuit 16, and the CPU 2, which will be described later.
0 and a synchronizing signal to the display clock generation circuit 22. 20 is the CPTJC central processing unit), and this CP
The program ROM 26.U20 stores a teletext program via the bass line 24. RAM 28, program memory 30 for storing teletext information of multiple programs
, CGR○M32, remote control I/F 36 that converts the signal from the remote control 34 into a predetermined signal and outputs it, CRTC4
0 and an additional sound decoder 42 are coupled. Said R
The AM 28 includes a stored program setting memory 44 for setting a plurality of programs to be stored in the program memory 30 in advance, and a display program setting memory 46 for setting programs to be sequentially displayed on the display section 9. A timer 48 for setting a page turning time interval T (for example, 7 seconds) is coupled to the CPU 20, and a clock signal from the display clock generation circuit 22 is input to the CRTC 40, which also serves as a display memory. A video RAM 50 is coupled, and the CRTC 40 displays R, G, B, Ys, Y on the display section 9.
m signal is output. An audio output section 49 is coupled to the output side of the additional sound decoder 42 . The timer 48 receives the vertical synchronization signal Vd from the synchronization separation circuit 12.
It is mainly composed of a counter that counts.

Next, the operation of the embodiment described above will be explained with reference to FIGS. 2 to 7.

(b) When the settings for self-financing display are commanded in advance using the remote control 34, the automatic page turning time interval T (for example, 7 seconds) is set based on the program in the program ROM 26, and the received television signal is controlled by the CPU 20. A plurality of programs to be extracted from the program and stored in the program memory 30 and a plurality of programs to be displayed by automatic page turning on the display section 9 are set in the timer 48, stored program setting memory 44, and display program setting memory 46, respectively. . For convenience of explanation, the setting contents of the stored program setting memory 44 and the display program setting memory 46 are the same, and 1 program (consisting of 10 pages) and 2 programs (consisting of 1 page) of TV channel number 1 (hereinafter simply referred to as "chi") are shown. shall be.

(b) On the other hand, as shown in Figure 3, the transmission order of teletext programs sent from the broadcasting station is 1 for chi.
The first page of the program, the first page of the second program.

1st page of 3 programs, . . . , 1st page of 100 programs, . . . 10th page of 1 program, 1st page of 2 programs.

5th page of 3 programs,..., 1st page of 100 programs.

···become that way. Therefore, the program ROM26
The teletext information corresponding to program 1 (consisting of 10 pages) and program 2 (consisting of 1 page) set in the stored program setting memory 44 is set by the first storage control means of the CPU 20 based on the program in the program. The teletext programs transmitted and received in the transmission order shown in FIG. 3 are extracted and stored in the program memory 30. At this time, program ROM2
Based on the program in 6, the discrimination means and channel control means of the CPU 20 discriminate the television channel of the program set in the stored program setting memory 44, and the tuner circuit selects the corresponding channel based on the discrimination output. be done. Therefore, when a program with only chi is selected as described above, there is no channel switching in the tuner circuit based on the discrimination output, but if the program set in the stored program setting memory 44 spans multiple TV channels, In this case, each time the channel of the set program changes, the channel of the tuner circuit is switched by the discrimination output.

(c) Then, when the remote control 40 is used to command the self-work display, based on the program in the program ROM 26, under the control of the CPU 20, as shown in FIG.
Regarding the automatic display flag in RAM 28, "Automatic display flag on?" is rYEsJ + Display program setting memory 4
When rYEsJ determines whether there is a reserved program in 6, the display program setting memory 46 is set based on this determination result.
The first program among the reserved programs set in , 1 of 1
A page is selected.

(d) Next, the CPU 20 searches the program memory 30 by comparing whether or not the one page of the one program selected in the above (c) matches the program information in the program memory 30, and -M When the teletext information is read out from the program memory 30 and transferred to the video RAM 50,
It is displayed on the display section 9. At the same time as this display, CPU20
sets the timer 48 and starts measuring time, and when the set time T of the timer 48 has elapsed, the message “Time up?
” is determined to be rYEsJ, and “Is this the last page?” is determined.

(e) Next, the CPU 20 asks "What is the last page?"
When it is determined to be NOJ, the teletext information of the second page of one program, which is the second page of the program being displayed, is read out from the program memory 3o and transferred to the video RAM 50, in substantially the same manner as in (d) above. It is displayed on the display section 9, and at the same time, the timer 48 is set to start timing. That is, the pages of the display are automatically turned over at intervals of the set time T.

(v) Then, when the above operations (d) and (e) are repeated and the display of 10 pages of one program is completed, the CPU 20 determines "Is it the last page?" as rYESJ, and "Is it the last program?"
” is determined to be rNOJ. Then, one page of two programs, which are the programs following the first program among the reserved programs set in the display program setting memory 46, is selected, and then the (
In almost the same manner as in (d), one page of teletext information for two programs is read from the program memory 30, transferred to the video RAM 50, and displayed on the first display section 9, and at the same time, the timer 48 is set to start timing. do. That is, the pages of the display are automatically turned over at intervals of the set time T.

(G) When the display time of the first page of the two programs has elapsed for the set time T, the CPU 20 selects "YESJ" for "Is this the last program?"
The automatic page turning display is terminated.

(H) In (B) to (G) above, the program memory 30
If the memory capacity of the program memory 30 is sufficient, the problem of "r page skipping" will not occur even if the first storage control means alone is used.
This problem may occur when the memory capacity of the
Page skipping is prevented by a function mainly based on the second storage control means, which will be described later.1 For example, assume that the capacity of the program memory 30 is 10 pages.

As shown in FIG. 4, the current writing pointer of the received program "1st page of 2 programs" written into the program memory 30 by the first storage control means in (b) above is set to 0 when "8th page of 1 program" is written. If "page 7 of program 1" is currently being displayed and the next program to be displayed is "page 8 of program 1," then page 7 of program r1 has finished being displayed. When you go to read out "8 pages of 1 program" to the program memory 3o, the area where "8 pages of 1 program" was written has been rewritten with "1 page of 2 programs", so page 8" cannot be displayed, and "page skipping" occurs.

Such "page skipping" is prevented by the first and second arithmetic functions, comparison function, and second storage function of the CPU 20 based on the program in the program ROM 26. That is, as shown in FIG. , the first calculation function by the CPU 20 calculates the interval t during which the same program is transmitted from the broadcast station side.
(for example, 20 seconds), the total number of pages in the program data header,
Based on the set time T (for example, 7 seconds) and the total number of pages of programs that are automatically displayed at the set time T, the time from when [1 page of 2 programs] is received to the display is calculated as A (7 (seconds) x 4 (pages). ); 28 (seconds)) is calculated. In addition, the second calculation function by the CPU 20 calculates the time B (420 (seconds)) required to memorize "1 page of 2 programs" when it is received, based on the set time T, the total number of pages of the received programs, etc. do.

The comparison function by CPU20 is rA<B? J to rNO
J is determined, and the second storage control function by the CPU 20 discards the data of "1 page of 2 programs" without performing storage by the first storage control means based on the determination result "N○" of the comparison function. The area where "8 pages of 1 program" was written will not be overwritten.
is prevented.

(S) In (H) above, the currently displayed program is “1”.
If the program to be displayed next is "page 1 of program 2" instead of "page 7 of program", and the next program to be displayed is "page 10 of program 1", the received program "page 1 of program 2" is stored in the program memory 30 by the first storage control means. No matter where the current write pointer is for "Page 1 of 2 Programs", A=7 (seconds), xi (page)=7 (seconds), and B#20 (seconds).

Is rA<B? '' is judged as rYEsJ, and the first storage control means writes the received program [1 page of 2 programs] into the program memory 3o.

Thereafter, in the same manner, the display pages of the teletext information of the reserved program set in the display program setting memory 46 are automatically turned over at the set time interval T without skipping r pages.

In the above embodiment, for convenience of explanation, two programs are set in the stored program setting memory and the display program setting memory: one program (consisting of 10 pages) and two programs (consisting of one page).
The present invention is not limited to this, and for example, as shown in FIGS. 6 and 7, 100 programs (1 page composition), 1 program (10 page composition), 2 programs (1 page composition), and 3 programs (5 pages) and 4 programs (3 pages) and 5
It may be six programs (one page); in this case,
Prevention of "page skipping" is performed as follows.

That is, as shown in Fig. 6, if what is currently being displayed is "1 page of 1 program" and what is currently being received is "1 page of 4 programs", then A = 7 (seconds) x 16 (pages) =1
12 (seconds), B valve 20 (seconds) x 3 (pages) = 60 (seconds), and since the time required for display is longer than the time required for memorization (there is some margin), is rA<B? ” is judged as “No”, and the data of 1 page of the 4 programs currently being received is discarded and not written to the 1 program memory. Also, as shown in Figure 6, the currently displayed data is “4”. If the current reception is "1 page of 1 program", then A = 7 (seconds) x 5 (pages) = 35 (seconds)
, B valve 20 (seconds) XIO (page) = 200 (seconds), and since the time required to display is shorter than the time required for memorization (there is no margin), is rA<B? ” rY
EsJ, and writes the data of "one page of one program" currently being received into the program memory. In the above embodiment, a memory number setting memory and a display program setting memory are provided separately, and the settings of these memories are Although the contents are the same, the present invention is not limited to this, and the program of teletext information stored in one program memory and the program to be automatically flipped and displayed can be set independently, and the content of multiple programs stored in the program memory can be set independently. The teletext information of any program from among the teletext information may be automatically flipped and displayed in any order, and the storage number setting memory may also be configured to serve as the display program setting memory. If this combination is used,
Although the order of automatic flip display is limited to the order set in the storage number setting memory, it is possible to reduce the required memory capacity and simplify the setting of stored programs and display programs.

In the embodiment described above, there is provided a discriminating means for discriminating the TV channel of the program set by the stored program setting means, and a channel control means for controlling the tuning of the tuner circuit to the corresponding channel based on the discriminating output of the discriminating means. Although the teletext information of multiple programs spanning multiple TV channels can be automatically flipped and displayed, the present invention is not limited to this.
The stored program setting means may be configured to set a plurality of programs on a single television channel.For example, the system may be a system in which a separate teletext adapter is combined with a television receiver that does not have a built-in single character signal processing circuit. When a teletext is received and displayed with automatic page turning, the stored program setting means sets a plurality of programs of a single television channel.

"Effects of the Invention" As described above, the teletext receiver according to the present invention reads the teletext information of the program set by the display program setting means at preset time intervals from the program memory and transfers it to the display memory. Since I configured it so that it is displayed on the display section,
Teletext information for a plurality of programs desired by the user can be sequentially displayed by automatic turning, and the page turning speed can be set to any speed desired by the user.

Furthermore, when the discrimination means and the channel control means are provided and the stored program setting means is configured to set multiple programs spanning multiple television channels, teletext information of programs spanning multiple television channels may be set. The page can be automatically turned and displayed, which is extremely convenient.

Furthermore, if the stored program setting means also serves as the display program setting means, the required memory capacity can be reduced and the setting of stored programs and display programs can be simplified.

[Brief explanation of the drawing]

Figure 1 is a block diagram of the main parts of an embodiment of a teletext receiver according to the present invention, Figures 2 to 5 explain the operation of Figure 1, and Figure 2 shows automatic page turning. FIG. 3 is a flowchart explaining the operation; FIG. 3 is an explanatory diagram explaining the transmission order of teletext programs sent from the broadcasting station;
The figure is an explanatory diagram explaining the operation in which programs set by the storage program setting means are stored in the program memory in the order of reception, FIG. 5 is a flowchart explaining the operation to prevent page skipping, and FIGS. Figure 7 explains the page skip prevention operation in another embodiment, Figure 6 is an explanatory diagram illustrating a case where the time required for display is longer than the time required for writing, and Figure 7 is an explanatory diagram for explaining the case where the time required for display is longer than the time required for writing. FIG. 6 is an explanatory diagram illustrating a case where the time required to display is short compared to time. 1... Demodulation section, 5... Teletext decoder section, 7...
・Video signal input terminal, 9...Display unit, 16...Character signal separation circuit, 20...CPU (central processing unit, 26...
...Program ROM, 28...RAM, 30...
Program memory, 44...Stored program setting memory, 46...
・Display program setting memory, 48...Timer, 50...
-Video RAM (display memory). Applicant Fujitsu General Ltd.

Claims (3)

[Claims] (1) In a teletext receiver that extracts teletext information from a received television signal, transfers it to a display memory, and displays it on a display unit, a program memory for storing teletext information of a plurality of programs; a stored program setting means for setting a program to be stored in the program memory; a first storage control means for storing teletext information of the program set by the stored program setting means in the program memory in the order in which it was received; and the display section. display program setting means for setting programs to be displayed sequentially;
a page-turning time setting means for setting a time interval for page turning; and a page-turning time setting means for sequentially transmitting teletext information of the program set by the display program setting means from the program memory at each time interval set by the page-turning time setting means. A program playback means reads and transfers the program to the display memory, and from the time the program set by the stored program setting means is extracted from the received television signal, the corresponding program is displayed on the display section by the program playback means. a first calculation means for calculating the time required until the program is displayed in the first storage control means from the time when the program set by the stored program setting means is extracted from the received television signal; a second calculation means for calculating the time required until the program is stored in the program memory;
Comparing means for comparing the calculated values of the first and second calculating means, and second storage control means for controlling whether or not the first storage control means stores based on the comparison output of the comparison means. A teletext receiver characterized by: (2) The stored program setting means sets a plurality of programs across a plurality of television channels, and includes a determination means for determining the television channel of the program set by the stored program setting means, and a determination output of this determination means. 2. The teletext receiver according to claim 1, further comprising channel control means for controlling the tuning of the tuner circuit to the corresponding channel. (3) The teletext receiver according to claim 1 or 2, wherein the stored program setting means also serves as display program setting means.