JPH038629B2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field> The present invention utilizes the vertical blanking period of a television video signal to transmit character (multiplex) signals transmitted by data packets whose unit length is one horizontal scanning period. Regarding teletext receivers that receive
In particular, the present invention relates to a teletext receiver having a multi-memory that stores teletext program contents in advance.

<Prior art> A conventional teletext receiver is equipped with a multi-memory to reduce the waiting time for displaying teletext, and this multi-memory is pre-stored with the contents of the teletext that the user wishes to view. There is a system that allows teletext to be displayed immediately on a CRT screen when necessary. However, in the conventional example, once the main power connected to the multi-memory is turned off, the stored contents of the multi-memory are lost, and when the main power is turned on again, the contents of the teletext broadcast that you wish to watch are stored in the multi-memory again. This requires tedious operations. Therefore, it has been desired to eliminate the need for such operations and to be able to display teletext immediately when the main power is turned on again.

<Purpose> The present invention provides that, after storing, for example, a teletext broadcast that you wish to view in the multi-memory, even if the stored content is lost when the main power is turned off, the stored content is automatically restored when the main power is turned on again. It is an object of the present invention to simplify the operation for storing teletext contents in a multi-memory.

<Example> Hereinafter, the present invention will be described in detail based on an example shown in the drawings.

FIG. 1 is an overall circuit diagram of a teletext receiver according to this embodiment. The teletext receiver of this embodiment has a television receiving section A and a teletext decoder section B. The television receiving unit A performs RF amplification and IF on the television signal received by the television antenna 1, similar to a normal television receiver.
It includes a receiving section 2 that performs processing such as amplification and detection, and a normal processing circuit 3 that processes the composite video signal from the receiving section 2, and also switches between the video signal and the text signal from the teletext decoder B. It includes a circuit 4 for outputting and a CRT 5. On the other hand, the teletext decoder section B includes a circuit 6 that extracts a character signal from the composite video signal from the receiving section 2 and performs predetermined data processing, and a buffer memory 7 that temporarily stores the character signal from the processing circuit 6. , a CPU 8 that controls the overall operation, a program ROM 9 that stores programs for the operation of the CPU 8, and a CPU 8 that controls the overall operation.
8 includes a working RAM 10 used for operation. Further, this teletext decoder section B generates a control signal in response to an operation signal from a multi-memory 11 in which contents of a teletext program are stored in advance and an operation section (not shown) for teletext broadcasting. The operation unit control circuit 12 and the operation unit control circuit 12,
The main power supply 13 includes a main power supply 13 whose supply/cutoff of power is controlled in response to a first control signal via a first signal line _l1 . The operating unit control circuit 12 is configured to provide a second control signal to the processing circuit 3 of the television receiving unit A and the CPU 8 via a second signal line _l2 .
Further, the main power supply 13 supplies main power to the switching circuit ₄ of the television reception section A, the processing circuit 6 of the teletext decoder section B, the buffer memory 7, and the multi-memory 11 via the first power supply line l3, Further, main power is supplied to the receiving section 2 of the television receiving section A, and the CPU 8 and program ROM 9 of the teletext decoder section B via the second power supply line _l4 . 14 is a data bus, and 15 is an address bus.

Next, in this embodiment, the backup power supply 16
have. This backup power supply 16 is connected to the working RAM 10 via a third power supply line _l5 . Also, this backup power supply 16
is supplied with a third control signal from the operating section control circuit 12 via the third signal line _l6 , and the power supply to the working RAM 10 is controlled in response to this third control signal.

Next, the function of the backup power supply 16 when the main power supply 13 is turned off and then turned on again will be explained with reference to FIG. Figure 2 shows
First area a and second area b of working RAM 10
FIG. Working RAM10
The first area a contains the teletext program number "1".
"2", "7", "3", "5"..."23" are stored. The program number and the contents of the program corresponding to this program number are stored in the memory area in the multi-memory 11 corresponding to the first area a. In the second area b, the program number desired to be viewed, in this embodiment, "7" and "15" are stored. In the second area b, "FF" indicates that no program number is stored. The number of program numbers that can be registered in the first area a matches the teletext storage capacity of the multi-memory 11, and the number of program numbers that can be registered in the second area b is equal to or less than that in the first area a. It's summery. Arrow lines m ₁ to _{m 5} are working
Program numbers “1” and “2” sent by PIP (program index packet) to the first area a of RAM 10
This indicates that "3", "5", . . . "23" are assigned and stored. In this state of memory,
The main power supply 13 is turned off. However, working
The RAM 10 is always connected to the backup power supply 16.
Since power is supplied, the memory contents of the working RAM 10 shown in FIG. 2 are not destroyed and are maintained as they are. Further, at this time, the stored contents of the multi-memory 11 are lost when the main power supply 13 is turned off. However, working
Since the program number is stored in the first and second areas a and b of the RAM 10, when the main power supply 13 is turned on again, the program number and the corresponding program content are stored in the multi-memory 11 again. here,
When storing the program number and program content stored in the second area b in the multi-memory 11, move the stored content in the second area b to the first area a with an arrow.
Transfer as shown in m ₆ and m ₇ .

Next, a more specific explanation will be given with reference to the flowchart shown in FIG.

When the main power supply 13 is turned on,
Check YES in the step and proceed to the step.
In this step, the second area b of the working RAM is
Clear and initialize all other circuits. Also, if the determination in step is NO, proceed to step. In the step, it is determined whether or not the channel has been switched, and if the determination is YES, the first area a is initialized in the step. If the determination in step is NO, the first area a is not initialized and normal routine processing is performed. If the judgment is YES in step or step, proceed to step, and as described below, the multi-memory 1 is stored in the first area a.
Start setting the program number whose contents are to be stored in 1. That is, in step, the second area b is searched, and if there is a reserved program number, it is determined as YES and the process proceeds to step. In the step, it is checked whether the reserved program with that number is being broadcast, and if it is, it is determined as YES and the program proceeds to the step, in which the reserved program number is transferred to the first area a. If the program is not being broadcast in the step, it is determined as NO, and the reserved program is not transferred. Next, in step, the second area b is searched again, and if a reserved program number still remains, it is determined as YES, the process returns to step, and the same process is repeated. Finish this operation for all reserved program numbers, and if there are no reserved program numbers left, go to step NO.
It is determined that this is the case and the process proceeds to the next step. In this step, program numbers read from the PIP are sequentially assigned to addresses within the first area a that have not received program numbers transferred from the second area b (step). When this allocation is completed, the teletext of the program number set in the first area a is stored in the multi-memory 11. In this way, reserved programs are stored preferentially in the multi-memory 11, and in the remaining portion of the multi-memory 11, teletext broadcasts of other program numbers are stored to the maximum extent permitted by the storage capacity of the multi-memory. Even when you suddenly think of watching a teletext program that you have not reserved, you can view many teletext programs without waiting.

<Effect> As described above, according to the present invention, in addition to the multi-memory that stores in advance the program number of teletext broadcasting and the program content corresponding thereto, the program number corresponding to the program content is stored, and in particular, the program number corresponding to the program content is stored. If there is a reserved program number, a working memory is provided to preferentially store the reserved program number, and a backup power source separate from the main power source connected to the multi-memory is connected to the working memory, and the main power source is connected to the working memory. When the main power is turned back on after being turned off, if there is a specially reserved program number in the working memory, that reserved program number will be stored preferentially, and if there is no reserved program number, the program will be automatically stored. The program number that is currently being broadcast is stored in the working memory, and the teletext program number and its contents are automatically reset in the multi-memory in accordance with the program number stored in the working memory. Users can easily change the program number of the program they want to watch with priority, and the program with the changed program number can be watched without waiting time when the main power is turned on again. The operation for storing the contents of teletext can be simplified.

In addition, even if the viewer has not specifically reserved a program number, the program number being broadcast is automatically stored in the working memory, and teletext broadcasting is automatically performed in accordance with the program number stored in the working memory. The program number and its contents are reset in the multi-memory, and the teletext programs being broadcast are stored to the maximum extent permitted by the storage capacity of the multi-memory, so you can suddenly watch teletext programs that you have not reserved. When you feel like it, you can watch many teletext programs without waiting.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which FIG. 1 is an overall circuit diagram, FIG. 2 is a diagram showing the states of the first area a and second area b of the working memory, and FIG.
12 is a flowchart showing a procedure for setting a teletext program number to area a. 8...CPU, 10...Working RAM, 11
...Multi-memory, 16...Backup power supply.

Claims (1)

[Scope of Claims] 1. A teletext decoder section is provided in a television receiving section, and the teletext decoder section includes a multi-memory that stores in advance at least a teletext program number and the program contents corresponding thereto. , a working memory that stores a program number corresponding to the program content and preferentially stores the reserved program number when there is a reserved program number, and the multi-memory is connected to a main power source. However, a backup power source separate from the main power source is connected to the working memory, and when the main power source is turned on again, the program number for which the program content is to be stored in the multi-memory is set in the working memory, and the program contents are stored in the working memory. A teletext receiver that automatically resets the teletext program number and its contents in the multi-memory in accordance with the program number set in the program number set in the working memory when the main power is turned on again. In particular, when there is a reserved program number, it is checked whether the program with the reserved program number stored in the working memory is being broadcast, and only when the program with the reserved program number is being broadcast. A reserved program number is set preferentially in the working memory, and after the reserved program number being broadcast is preferentially set in the working memory, automatically other reserved program numbers other than the preferentially set reserved program number are set in the working memory. The program number of the program being broadcast is set in the working memory, and automatically when the program with the reserved program number stored in the working memory is not being broadcast or there is no specially reserved program number. A teletext receiver that sets the program number of the program being broadcast on the computer in its working memory.