JPS62136985A - Character broadcasting receiver - Google Patents

Abstract

PURPOSE:To display the contents of reserved programs continuously on a screen with a key operation of one time by reading out continuously the broadcasting data in the reserved programs stored at a data memory with a search command by a user at every regulated time, and displaying them after appropriate processings are performed. CONSTITUTION:A television signal obtained from a reception part 2 is supplied to and waveform-arranged at a waveform equalization data sampling circuit 12, and a broadcasting character signal is sampled. Next, through a serial/ parallel conversion and error correction circuit 16 and a fetching buffer 17, only a required data is transferred to and stored on a data memory 22 based on the number of the reserved program stored on a reserve program memory 22'. Meanwhile, a sub CPU24 retrieves the data memory 22 based on a reserved content indicated by the key operation, and reads out a required character code, and calculates an address within a KANJI (Chinese character) ROM31, and transfers in order each character pattern and each display address to a display controller 27, and displays them on a CRT7 through a matrix circuit 29 and a video switching circuit 6 taking a synchronization with a display clock generator 18 and a synchronizing signal generator 14.

Description

Detailed Description of the Invention (Technical Field) The present invention utilizes the vertical blanking period of a television video signal to transmit teletext signals transmitted in data packets whose unit length is the horizontal scanning period. This invention relates to a teletext receiver for receiving teletext broadcasts.

(Prior Art) As a teletext broadcasting method in which a character signal is multiplexed and transmitted on a television video signal, a pattern method in which characters and graphics are separated into pixels and transmitted has already been put into practical use. In addition, a coding system for transmitting encoded characters and figures is being put into practical use.

By the way, the receivers of each of these systems are equipped with a multi-memory as a data memory, and the data of the program and page specified in advance by the user is stored in this multi-memory every time the data arrives, so that the program can be reserved. There is something I did.

However, if there are a large number of reserved programs, the display on the screen becomes difficult to read, which is inconvenient. In this conventional example, a program index is displayed, which is convenient for the viewer, but the program index only displays the program number. The content of the program is unknown. Therefore, in order to grasp the reservation details of the program corresponding to the program number, the viewer must perform key operations each time, which is very troublesome.

(Object of the Invention) The present invention has been made in view of the above circumstances, and provides a teletext receiver capable of continuously displaying the contents of reserved programs on the screen with just one key operation. is intended to provide.

(Structure of the Invention) In order to achieve the above object, the present invention has the following structure.

FIG. 1 is a block diagram showing the configuration of the present invention. A teletext receiver according to the present invention includes a data memory A having a plurality of storage areas capable of storing a plurality of pages of broadcast data of a teletext program, and a reserved program that stores reserved programs to be stored in the data memory A. It is equipped with a memory B.

The received video signal is sent to teletext data importing means C.
given to. Teletext data importing means C extracts teletext data packets from the video data, performs appropriate data processing, and transfers the broadcast data of the program stored in the reserved program memory B to the data memory A.

On the other hand, when there is a search command from the user, the readout control means controls the data memory A based on the command.
Broadcast data of reserved programs stored in the memory is continuously read out at regular intervals.

The read broadcast data is appropriately processed and displayed on the display means.

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

FIG. 2 shows teletext reception according to an embodiment of the present invention.

FIG. 2 is a block diagram of the machine.

The teletext receiver includes a receiving section 2 that performs RF amplification, IF amplification, and detection of a television signal input from an antenna l, and extracts and processes a video signal from a composite video signal output from the receiving section 2. A video signal processing section 3, an audio signal processing section 4 that also extracts and processes an audio signal from a composite video signal, and a teletext signal processing section 5, which will be described in detail later.
a video signal switching circuit 6 for switching between the television video signal obtained by the video signal processing section 3 and the character signal obtained by the teletext signal processing section 5; and a CRT serving as a display section.
7, a drive circuit 8 that drives the CRT 7, an audio switching circuit 9 that switches between the audio signal obtained by the audio signal processing section 4 and the audio signal obtained from the teletext signal processing section 5, and an audio amplification circuit. IO and a speaker 11.

The teletext signal processing unit 5 includes a receiving unit 1 as a component corresponding to the broadcast data importing means C shown in FIG.
A waveform equalization data extraction circuit 1 which introduces a composite video signal from and extracts a character signal included in the composite video signal.
2, clock pulse generator 13, and synchronization signal generator 1
4, a framing detection and identification circuit 15, a serial-parallel conversion and error correction circuit 16, a capture buffer 17 that temporarily captures data, and a main CPU 1 that determines whether the data captured by the buffer 17 is correct.
9, a program ROM 20 for the main CPU 1Q, and a work RAM 21 for the main CPU 1Q.

Further, the data memory 22 corresponding to the data memory A shown in FIG. 1 stores predetermined data of the extracted teletext signal. This data memory 22 is a multi-memory having a plurality of storage areas, and can store a plurality of pages of data of a teletext program.

A reserved program memory 22' corresponding to the reserved program memory B shown in FIG. 1 stores the numbers of a plurality of teletext programs to be stored in the data memory 22.

Although the data memory 22 and the reserved program memory 22' are shown separately for convenience of explanation, the reserved program memory 22'
' can also be formed using a part of the memory area of the data memory 22.

Furthermore, as a part corresponding to the broadcast data reading means shown in FIG.
4 program ROM 25 and the same sub CPU 24
A work RAM 26 and a kanji ROM 31 are provided.

As parts corresponding to the display means corresponding to FIG. 1, a display clock generation circuit 18, a display controller 2
7, a display memory 28, and a matrix circuit 29.

The operation timings of the main CPU 19 and sub CPU 24 are controlled by a timing control circuit 23.

Further, the teletext signal processing section 5 includes an audio decoder 30, an interface circuit Ia 32, a remote control receiving section (R/C) and a keyboard 33, and a printer 3.
4.

Next, a general reception operation of the teletext signal processing section 5 having the above configuration will be explained.

The television signal obtained from the receiving section 2 is supplied to a waveform equalization data extracting circuit 12. The television signal is waveform-shaped by slicing it to an appropriate level in this circuit 12, and a teletext signal is extracted.

The extracted teletext signal is converted from a serial signal to a parallel signal in a direct value conversion and error correction circuit 16, and after error correction is performed, it is temporarily stored in a capture buffer 17. At this time, it is necessary to synchronize the teletext signal with the direct value conversion in the direct value conversion and error correction circuit 16, so the clock pulse generator 13 and the framing detection and identification circuit 15 synchronize in bits and bytes. It will be done. The teletext signal stored in the capture buffer 17 is judged by the main CPU 9 as to whether there is a framing detection error, error correction error, etc., and whether there is a reservation or not based on the number of the reserved program stored in the reserved program memory 22'. A determination is made, and only the necessary data is transferred and stored in the data memory 22.

On the other hand, the sub CPU 24 reads only necessary data from the data memory 22, decodes it, and sends it to the display controller 27.

That is, the sub CPU 24 searches the data memo IJ 22 based on the reservation details specified by the user by operating the keyboard or remote control operation section,
Necessary character codes stored in the data memory 22 are read out, addresses in the kanji ROM 31 are calculated from the character codes, and each character pattern and its display address are sequentially transferred to the display controller 27. Accordingly, the display controller 27 sets the character pattern in the display memory 28. At this time, in order to synchronize with the television image, the display clock generator 1
8 and a synchronization signal generator 14, and is output to the video switching circuit 6 via a matrix circuit 29. As a result, the required character pattern is displayed on the CRT 7.

Further, the audio data is converted into an audio signal by the audio decoder 30 and output to the audio switching circuit 9. This reproduced audio signal is output to the speaker 11 through the amplifier 10.

Note that the timing control circuit 23 switches access to the data memory 22 between the main CPU 19 and the sub CPU 24 .

Next, searching within the data memory 22 will be explained based on the flowchart of FIG. The routine shown in this flowchart shows the operating procedure of the sub CPU 24, and is started by a reset start such as when the power is turned on.

First, in step a, the work RAM 26 is initialized.

Next, the process moves to step b, where it is determined whether or not there is key human power. If there is no key manpower, repeat step b.

When it is confirmed that there is key human power, the process moves to step C, where it is confirmed whether the key human power is search key human power.

If the search key is not manually operated, the process moves to step d, where processing corresponding to the search key is performed manually, and then returns to step b.

If it is confirmed in step C that the search key is manually operated, the process moves to step e and multi-memory block 1 is specified.

Then, in step f, it is checked whether the designated multi-memory magnet 1 is already reserved.

If the program has been reserved, the process moves to step g, and it is checked whether the reserved program has already arrived.

If the reserved program has arrived, the process moves to step h and a timer is set. This timer sets the time for displaying the data in the multi-memory on the CRT screen, and is set to, for example, 3 to 5 seconds.

Then, the process moves to step i, where the data in the multi-memory is decoded and transferred to the display memory 28.

The data transferred to the display memory 28 is given to the CRT 7 via the matrix circuit 29, video switching circuit 6, and CRT drive circuit 8, so that an image corresponding to the data is displayed.

In step j, it is checked whether the cent time of the timer has elapsed.

By the way, if it is determined in step f that the multi-memory is not reserved, and if it is determined in step j that the timer set time has elapsed, the process moves to step k and the multi-memory number is increased. Specify the next multi-memory.

Then, in step 1, it is checked whether there is any multi-memory that has not been specified. If there is a multi-memory that has not been specified, the process returns to step f and repeats the above-described procedure, whereas if there is no multi-memory that has not been specified, the process returns to step b.

In this way, the contents of the reserved programs are sequentially displayed on the CRT screen at regular intervals.

(Effects of the Invention) As described above, the teletext receiver according to the present invention continuously reads teletext data stored in the data memory at regular intervals based on a search command from the user, and displays the teletext data. Therefore, the user can easily check the contents of the reserved program. Therefore, according to the present invention, there is no need to perform key operations every time the content of each program is checked, which is the case with conventional devices, and is very convenient.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a teletext receiver according to the present invention, FIG. 2 is a block diagram of an embodiment of the present invention, and FIG. 3 is a flow chart showing a search procedure in the embodiment. A...Data memory, B...Reserved program memory, C.
. . . Broadcast data importing means, D . . . Broadcast data reading means, E . . Displaying means, 5 . ...Main CPU, 24...Sub CPU
U.

Claims (1)

[Claims] (1) A data memory having multiple storage areas capable of storing multiple pages of broadcast data of teletext programs, a reserved program memory that stores reserved programs to be stored in the data memory, and characters from received video signals. a teletext data importing means for extracting broadcast data packets, performing appropriate data processing, and transferring the broadcast data of the program stored in the reserved program memory to the data memory; The present invention is characterized by comprising: readout control means for continuously reading out broadcast data of reserved programs stored in the data memory at regular intervals; and display means for appropriately processing and displaying the broadcast data read from the data memory. teletext receiver.