JPS62151086A - Teletext receiver - Google Patents

Abstract

PURPOSE:To make unnecessary the re-registration of a program number accompanied by a channel switching by storing the registration of a requested program making a correspondence between the program number and a channel. CONSTITUTION:A non-volatile memory 14 is put in a write mode when a registration operation is performed on a keyboard 6, and is put in a read mode when the channel is switched. When a broadcast is received, a television signal on which a text signal is multiplexed is derived from a terminal 12a on one side of a selection/demodulation circuit 12, and a channel data in receiving is derived from a terminal 12b on the other side. A channel data 13, when the channel is switched, is decoded with a microcomputer 5, and a data in the non-volatile memory 14 accumulated at an area corresponding to the channel is read out at a RAM5a. In this way, it is no necessary to re-register the program number at every switching of the channel.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a teletext broadcasting receiving device, and particularly relates to a teletext broadcasting system that allows a desired program to be immediately received even when switching to another channel. This invention relates to a receiving device.

[Technical Background of the Invention] Teletext broadcasting is a system that repeatedly transmits various kinds of teletext programs in the form of digital signals during a specific horizontal scanning period of the vertical blanking period of a television signal. The receiving side is provided with a buffer memory for taking in the multiplexed signal, and the information sent is sequentially written into this buffer memory. In this case, when the receiver specifies the number of the desired program from among these multiple pieces of information, the control signal of the specified program is searched, and only the information of the subsequent specified programs is read out from the buffer memory. and the desired program can be viewed.

However, as the number of types of information to be transmitted increases, the time required to transmit all programs becomes longer, which causes a problem in that the waiting time until a designated program is displayed on the screen becomes longer.

FIG. 4 shows a conventional character multiplex receiver which solves the above problem.

In FIG. 4, a video-detected television signal is supplied to a terminal 1, and this signal is supplied to a data acquisition circuit 3 via a waveform shaping circuit 2.

The data acquisition circuit 3 detects the character multiplex digital signal in the preview signal according to instructions from the microcomputer 5, samples the data, and sequentially writes the sampled data into the buffer 7 memory 4. The buffer 7 memory 4 is controlled by the microcomputer 5 and outputs data of a program specified by a program selection keyboard 6 in the form of a remote control, for example. After this data is decoded into display data by the microcomputer 5, it is written to the first image memory 8 via the display control circuit 7, and at the display timing of the display control circuit 7 controlled by the microcomputer 5. The image is read out from the image memory 8. The display data from the image memory 8 is supplied to the television receiver via the display control circuit 7.

A teletext receiving device with such a configuration has a keyboard 6.
Even if a desired program is selected, a waiting time is required until all the information about the program is received and read out from the image memory 8 as display data.

This waiting time improves as the amount of information increases, so in the device shown in FIG.
It is provided with a second image memory (hereinafter referred to as page memory 9) that stores . This page memory 9 stores a plurality of programs to be viewed in advance and then receives the stored programs upon request without being subject to time constraints.

To receive registered programs using the page memory 9,
First, the number of the desired program is stored in the ffiRAM 5a built in the microcomputer 5 by operating the keyboard 6 for registration. As a result, the microcomputer 5 reads the program data corresponding to the storage number from the buffer memory 4, decodes it into display data, and then displays it in the page memory 4.
Accumulate in.

After completing the registration operation, enter the program number on the keyboard 6.
, the microcomputer 5 instructs the display control circuit 7 to read out the display data that has been multiplied by '1i from the basis memory 9.

As described above, the display control circuit 7 can read the display data from the page memory 9 with the same processing as the image memory 8, and the recipient can view the desired information without waiting for data.

J3, the above flow is performed by a program stored in the built-in ROM 5b.

[Problems with Background Art] The countermeasure for the device shown in FIG. 4 is that registered programs can be displayed immediately on the condition that the teletext channel 11 is not switched to another channel. However, when switching teletext channels, the program content and program number do not necessarily match between broadcast stations! There was a problem in that it was not possible to receive programs that had the same content as desired. For this reason, conventional teletext receiving apparatuses have the disadvantage of having to switch broadcast channels.

[Object of the Invention 1] The present invention has been made in view of the above-mentioned points, and an object of the present invention is to provide a multi-text broadcast receiving apparatus that does not require re-registration of program numbers when switching channels.

[Summary of the Invention 1] The present invention provides a teletext broadcasting receiving device equipped with an image memory for storing teletext data of a plurality of programs, including a receiving channel detecting means for detecting a channel being received, and a predetermined number of channels for each broadcast channel. storage means for storing the program number of the program, the registration of the desired program is stored in the storage means by matching the program number and the channel, and when the reception channel is detected, the desired program on that channel is registered. is updated and stored in the image memory, thereby eliminating the trouble of re-registration.

[Embodiments of the invention] Hereinafter, the present invention will be described with reference to illustrated embodiments.

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

In FIG. 1, the same symbols are given to the same parts as in FIG. The video-detected television signal is output from one output terminal 12a of this channel selection/demodulation circuit 12, and the other output Ca
J data 13 indicating the channel being received is output from 12b. This channel data 13 is decoded by the microcomputer 5.

Further, the microcomputer 5 is connected to a nonvolatile memory 14 via a bus 15. This embodiment is unique in that it has this non-volatile memory 14, and the receiver can register multiple numbers representing desired programs for each channel in this non-volatile memory 14, so that even if the receiving channel is switched, a new number will be added. There is no need to register for such programs.

This nonvolatile memory 14 is put into a write mode mainly when a registration operation is performed using the keyboard 6, and becomes a read mode when a channel is changed.

Note that the microcomputer 5 is a ROM 5E).

In addition to being equipped with a RAM 5a, a waveform shaping circuit 2.a data acquisition circuit 3. The teletext signal that has passed through the buffer 1 memory 4 is input, and the image memory 8 and page memory 9 are further controlled via the display control circuit 7.

FIGS. 2(a) to 2(C) show examples of memory tables of the RAM 5a, page memory 9, and nonvolatile memory 14 used in the apparatus shown in FIG. 1, respectively. The page memory 9 has a storage area for 8 pages and can store program data. The RAM 5a stores program numbers of program data to be stored in each page of the page memory 9 for the channel being received. The non-volatile memory 14 can store 8 pages worth of program numbers for 12 channels.
In FIG. 2, the program number data of MIJ, N2J, etc. "18" is stored in the area of page 1 [1 to 8 pages] of the first channel, and the program number data of "18" is stored in the area of page 1 of the first channel, r21J, r
22J .

The operation of the teletext broadcasting receiving apparatus having the nonvolatile memory 14 as described above will be explained with reference to FIG.

FIG. 3 shows the processing flow of the microcomputer 5 according to this embodiment.

When a broadcast is received, one end 12 of the channel selection/demodulation circuit 12
A television signal including multiple character multiplex signals is derived from the terminal a, and channel data 13 being received is derived from the other end 12b. The signal from the above-mentioned 12a is sliced at a predetermined slice level by the waveform shaping circuit 2 to produce a rectangular waveform signal, and the data acquisition circuit 3 extracts only the multiplexed signal from this rectangular signal and stores it in the buffer memory 4. Input.

On the other hand, the channel data 13 is decoded by the microcomputer 5 when the channel is switched (steps 81, 82). microcomputer 5
determines whether to change the channel or not, and reads out the data stored in the nonvolatile memory 14 in the area corresponding to the channel, that is, the program number data for pages 1 to 8 into the RAM 5a. Then, data loading into the buffer memory 4 is resumed (step 83゜8).
4>.

In step S5, it is determined whether there is a request to register the program number, and if it is right '°, the process goes to step SO.

Registration processing is performed in S7. That is, re-registration is performed by writing the designated program number into the RAM 5a, and data retrieval is resumed. Further, the program number written in the RAM 5a is stored in a predetermined storage area allocated for each channel in the nonvolatile memory 14. Then, in step S8,
The presentation process of the data taken into the buffer 7 memory 4 is executed.

Part 15 of the program data taken into the buffer 7 memory 4 is one in which the program control signal sent to the head of the program number data matches the program number read into the RAM 5a.
The data is stored in the corresponding area of the page memory 9.

In other words, when channel 1 is switched to channel 2, if the non-volatile memory 14 is not provided, the program number data that is encrypted to retrieve only the desired data from the buffer memory 4 is, for example, "11". However, by providing the non-volatile memory 14, when switching to the second channel, the data changes from [11] to "21" and the program number corresponding to that channel is stored. This means that it is possible to capture signals with the desired content.

In the above embodiment, the channel data 13 from the channel selection/demodulation circuit 12 is used as a means for detecting a change in channel, but the transmission identification number can be determined from the program index data included in the teletext data. It may be possible to know that the Boo1J channel has been changed by reading this transmission identification number. According to this embodiment, there is no need to input the channel data 13 from the channel selection/demodulation circuit 12 to the microcomputer 5.

In this way, each time you change the channel, you can check the program in this embodiment.
This eliminates the need to re-watch the FI issue.

Furthermore, since a non-volatile memory is used as a storage means for program numbers, there is an advantage that the registered program numbers will not be erased even if the power is turned off and then turned on again. However, the present invention does not necessarily require the use of nonvolatile memory as the storage means.

[Effects of the Invention] As explained above, according to the present invention, the user can always receive registered programs without waiting time by performing the σ recording operation once for the desired channel. .

[Brief explanation of drawings]

FIG. 1 is a block circuit diagram showing an embodiment of a character multiplex reception device according to the present invention, FIGS. 2 and 3 are explanatory diagrams for explaining the operation of the present invention in detail, and FIG. 4 is a conventional reception FIG. 2 is a block circuit diagram showing the device. 4... Buffer 7 memory, 5... Microcomputer 6... Keyboard, 9... Page memory, 11
... Antenna, 12 ... Tuning/demodulation circuit, 14
...Non-volatile memory. Agent Patent Attorney Noriyuki Chika
Hiroshi Uji Figure 1

Claims (1)

[Scope of Claims] A teletext broadcasting receiving device equipped with an image memory for storing character multiplex data of a multiple character multiplex program, comprising: receiving channel detection means for detecting a channel being received; a storage means for storing a number of a text multiplex program; a program number for each channel stored in the storage means is read out based on the channel data detected by the reception channel detection means; 1. A teletext broadcasting receiving apparatus comprising an image memory updating means for updating the contents stored in the memory.