JPS63240188A - Teletext receiver - Google Patents

Abstract

PURPOSE:To speedily display a contents program by storing received contents programs by detected channels in a contents program storage means. CONSTITUTION:When channels are changed under remote control 11, channel data is sent to a CPU 24 through a channel selection control circuit 22 and a remote control interface 23. The CPU 24 judges the change of the channels to detect and store contents programs in a contents program storage memory 30 by the detected channels, so that the storage of the contents programs of the channels is recorded. Therefore, when the channels are changed and a next contents program is selected, the contents program which is already stored in the memory 30 are read out and displayed immediately on a CRT 16.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to a teletext receiving device, and more particularly to a teletext receiving device that can quickly display a table of contents program.

(Prior Art) Generally, on the transmitting side of a teletext system, a table of contents program is sent out for the purpose of informing recipients of which program and what content is being broadcast. This table of contents program is usually assigned a program number "0" and is selected and received by pressing the table of contents program key [table of contents] or the program "0" using a remote control or the like.

Incidentally, since programs in the teletext system are transmitted in a time-division manner, a so-called waiting time is required from when a receiver makes a reception request until the program is actually received. This waiting time is limited to a maximum transmission period of teletext programs (generally 20 to 30 minutes).
30 seconds).

Generally, program selection is performed by first receiving a table of contents program, checking the program number of each desired program, and then manually inputting the program number. In other words, reception of the table of contents program is essential for program selection. However, since the above-mentioned waiting time is required to receive the table of contents program, it has been desired to reduce the waiting time when receiving the table of contents program.

Therefore, it has been considered to reduce the waiting time by importing and storing the received data of the table of contents program in a memory, and subsequently reading out and displaying the received data imported into the memory. However, even with this method,
Immediately after channel switching, the received data of the table of contents program is not captured in the memory, so it takes a maximum of about 20 to 30 seconds to receive the table of contents program at the time of channel switching.

(Problems to be Solved by the Invention) As explained above, in the conventional teletext receiving device, it was not possible to obtain the desired program in a short time because it required waiting time to select the table of contents program immediately after changing the channel. .

The present invention has been made to solve the above-mentioned problems, and its purpose is to provide a teletext receiving apparatus that can immediately display a table of contents program even when changing channels.

[Structure of the Invention] (Means for Solving the Problems) This invention provides reception channel detection means for detecting a channel being received, and a received table of contents corresponding to the reception channel detected by the reception channel detection means. and a table of contents program storage means for storing program signals.

(Function) According to the above configuration, since the table of contents program is stored for each channel in the table of contents program storage means, the table of contents program can be immediately read out from the table of contents program storage means and displayed even when changing channels.

(Embodiments) Hereinafter, embodiments of the teletext receiving apparatus of the present invention will be described in detail with reference to the drawings.

In FIG. 1 showing an embodiment of the present invention, a selection 5 circuit 10
selects the signal of the channel selected by the remote control 11 and outputs it as a video signal and an audio signal. The video signal is supplied to a video amplifier circuit 13 and a color demodulation circuit 14 via a switch 12, and then supplied to a C
It is given to RT16 and an image is displayed. On the other hand, the audio signal is supplied to the sound amplification circuit 18 via the switch 17, and then to the speaker 19 to be amplified.

This embodiment has a teletext signal decoding function in addition to the normal television function described above. That is, the tuning circuit 10
The video signal output from the capture control circuit 20 is converted into a digital signal. Furthermore, clock reproduction and framing code detection are performed, the signal is converted into a teletext signal in units of bytes, and after error correction is performed, the signal is written into the arithmetic RAM 21. When a desired program in the teletext signal is selected by the remote control 11, the desired program number is input manually from the channel selection control circuit 22 to the remote control interface 23. The CPU 24 takes in the desired program number from the remote control interface 23 via the data bus, and detects whether the teletext signal stored in the arithmetic RAM 21 is the desired program. If it is the desired program, the CPU 24 decodes the teletext signal stored in the arithmetic RAM 21 according to the program stored in the program ROM 25. The coded characters are converted into pattern data by the character ROM 26 and written into the image RAM 2B via the display control circuit 27. Two display control circuits read out the data written in the image RAM 2B in synchronization with the raster scan, and display it on the CRT 16 via the switch 15.

On the other hand, the encoded music data is transmitted to the music generation circuit 29
A sound decoding process is performed by the system, and the signal is converted into a music signal. This signal drives the speaker 19 via the switch 17° sound amplification circuit 18.

Furthermore, in this embodiment, a non-volatile table of contents program storage memory 30 is provided for storing table of contents programs for each channel. The table of contents program storage memory 30 will be explained with reference to a block diagram of the table of contents program memory when changing channels.

When the channel is changed using the remote controller 11, the channel data is transferred to the channel selection control circuit 22. The information is transmitted to the CPU 24 via the remote control interface 23. Thereby, the CPU 24 determines whether or not the channel has changed in step S20 of FIG. If the channel has changed, it is determined in step S21 whether the table of contents program data is already stored in the table of contents program storage memory 30. If the table of contents program is not stored, the table of contents program is detected (7 and stored in the table of contents program memory 30, step 522), and the fact that the table of contents program of that channel is stored is recorded (step 523).
.

Here, as shown in FIG. 3, the table of contents program storage memory 30 is roughly divided into an index area and a data area. The index area indicates the start address and end address where the data of the table of contents programs of channels 1 to n are stored. The data area is 1
This is an area for storing table of contents program data for ~n channels. In the index area, if the start address and end address are the same, it indicates that table of contents data for that channel is not stored.

With the above configuration, it becomes possible to store the table of contents of all channels in the table of contents program storage memory 30. Therefore,
When selecting a table of contents program when changing channels, there is no need to wait for the arrival of the table of contents program as in the past, and the table of contents program already stored in the table of contents program storage memory 30 can be read out and immediately displayed on the CRT 16. can.

Furthermore, in this embodiment, since the table of contents program storage memory 30 is configured with a non-volatile memory, the table of contents program data is stored in the table of contents program storage memory 30 even when the power is turned on again after being turned off. Therefore, there is no need to wait for the arrival of the table of contents program as when changing channels, and the table of contents program can be displayed immediately.

[Effects of the Invention] According to the present invention, since the table of contents program is stored for each channel, the table of contents program can be displayed immediately even when changing channels, and the waiting time for receiving a desired program can be shortened.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an embodiment of the teletext receiver of the present invention, FIG. 2 is a flowchart explaining the operation of the embodiment shown in FIG. 1, and FIG. 3 is a partial configuration of the embodiment. FIG. 2 is a memory configuration diagram showing details. 11...Remote control, 16...CRT. 20...Intake control circuit, 22...Tuition selection control circuit. 23...Remote control interface. 24...CPU, 27...Display control circuit. 28... Image RAM, 30... Table of contents program storage memory.

Claims (1)

[Scope of Claims] In a teletext receiving device that receives a teletext signal including a broadcast program and a table of contents program indicating a table of contents of the broadcast program, a reception channel detection means for detecting a channel on which a broadcast program is being received; a table of contents program storage means for storing a received table of contents program signal corresponding to the reception channel detected by the reception channel detection means; and a table of contents program storage means for reading out the table of contents program signal stored in the table of contents program signal according to the reception channel. What is claimed is: 1. A teletext receiving device comprising a table of contents program display means for displaying a table of contents program.