JP2635578B2 - Teletext receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a teletext receiver, and more particularly to a teletext receiver capable of promptly displaying a table of contents program.

(Prior Art) In general, the transmitting side of a teletext system sends out a table of contents program in order to inform a receiver which program is broadcasting what content. This table of contents program is normally assigned a program number "0", and is selected and received by pressing a table of contents table key [table of contents] or a program "0" using a remote controller or the like.

By the way, since the program transmission of the teletext system is performed in a time-division manner, a so-called waiting time is required from when the receiver makes a reception request to when the reception is actually performed. This waiting time is a maximum of the transmission cycle of a teletext program (generally 20 to
30 seconds).

In general, program selection is performed by first receiving a table of contents program, checking the program number of a desired program, and then inputting the program number. In other words, receiving a table of contents program is indispensable for program selection. However, the above-mentioned waiting time is required even in the reception of the table of contents program. Therefore, it is desired to reduce the waiting time when the table of contents program is received.

Therefore, it has been conceived that the reception data of the table of contents program is fetched and stored in a memory, and thereafter, the reception data fetched into this memory is read out and displayed, thereby reducing the waiting time. However, even in this method, since the received data of the table of contents program is not fetched into the memory immediately after the channel switching, the reception of the table of contents program at the time of the channel switching requires a maximum time of about 20 to 30 seconds. .

(Problems to be Solved by the Invention) As described above, in the conventional teletext receiver,
Since a waiting time is required for selecting a table of contents program immediately after a channel change, a desired program cannot be obtained in a short time.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a text broadcast receiving apparatus capable of immediately displaying a table of contents program even when a channel is changed.

[Structure of the Invention] (Means for Solving the Problems) A teletext receiving apparatus according to the present invention provides a teletext signal for receiving a teletext signal including a teletext program and a table of contents program signal indicating the table of contents of the teletext program. In the broadcast receiving device,
A non-volatile memory for storing the table of contents program signal for each reception channel; channel detection means for detecting a changed reception channel; and determining whether the table of contents program signal for the changed reception channel is stored in the non-volatile memory. The determination means, and the determination result of the determination means, read and display the table of contents program signal stored in the non-volatile memory when indicating that it is stored, newly when indicating that it is not stored Display means for storing and displaying the table of contents program signal received from the teletext signal in the non-volatile memory, wherein the non-volatile memory includes a start address where the table of contents program signal is stored for each of the reception channels. An index area consisting of an end address and the table of contents program signal are fixed for each of the reception channels. And a data area comprising a memory area having a continuation address, wherein the determination means determines that the table of contents program signal is not stored when the start address and the end address of the index area have the same value. And determining that the table of contents program signal is stored when the values are different.

(Operation) According to the above configuration, the table of contents program signal is stored in the data area of the non-volatile memory having a continuous address for each channel. When the channel is changed, it is determined from the start address and the end address whether or not the table of contents program signal of the changed channel is stored in the nonvolatile memory. As a result of this determination, if it is already stored, the table of contents program signal read from the non-volatile memory is displayed. If not, the newly received table of contents program signal is stored and displayed in the non-volatile memory.

(Example) Hereinafter, an example of the teletext receiving device of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an embodiment of the present invention.
Selects a signal of the channel selected by the remote controller 11 and outputs it as a video signal and an audio signal. The video signal is supplied to the video amplification circuit 13 and the color demodulation circuit 14 via the switch 12 and then to the CRT 16 via the switch 15 to display an image. On the other hand, the audio signal is a switch
After being supplied to the sound amplification circuit 18 via the speaker 17, the sound is given to the speaker 19 and amplified.

This embodiment has a function of decoding a teletext signal in addition to the normal television function described above. That is, the tuning circuit 10
The video signal output from is converted into a digital signal in the capture control circuit 20. Further, clock reproduction and framing code detection are performed, converted into a character broadcast signal in byte units, subjected to error correction, and then written into the arithmetic RAM 21. When a desired program in a teletext signal is selected by the remote controller 11, a desired program number is input from the channel selection control circuit 22 to the remote controller interface 23. The CPU 24 captures the desired program number from the remote control interface 23 via the data bus, and
Whether the teletext signal stored in M21 is a desired program is detected. If it is a desired program, the CPU 24
Is performed in accordance with the program stored in the program ROM 25. The coded characters are converted into pattern data by a character ROM 26, and are passed through a display control circuit 27 to an image RAM 28.
Is written to. The display control circuit 27 reads the data written in the image RAM 28 in synchronization with the raster scan,
Display on the CRT 16 via the switch 15.

On the other hand, the coded music data is supplied to a music generation circuit 29.
Performs a sound decoding process to convert the sound signal into a music signal. This signal drives the speaker 19 via the switch 17 and the sound amplification circuit 18.

Further, in this embodiment, a nonvolatile table of contents program storage memory 30 for storing a table of contents program for each channel is provided. The table-of-contents program storage memory 30 is provided to reduce the waiting time for displaying the table-of-contents program when a channel is changed, and will be described below with reference to the flowchart of FIG. 2 and the memory configuration diagram of FIG. .

When the channel is changed by the remote controller 11, the channel data is transmitted to the CPU 24 via the channel selection control circuit 22 and the remote controller interface 23. This allows the CPU 24
At step S20 in FIG. 2, it is determined whether or not the channel has changed. If the channel has changed, it is determined in step S21 whether or not the table of contents program data has already been stored in the table of contents program storage memory 30. If not stored, the table of contents program is detected and stored in the table of contents program memory 30 (step S2).
2) Record that the table of contents program of the channel is stored (step S23).

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

With the above configuration, the table of contents of all the channels can be stored in the table of contents program storage memory 30. Therefore,
When selecting a table of contents program at the time of channel change, it is not necessary to wait for a table of contents program to arrive as in the conventional case, and the table of contents programs already stored in the table of contents program storage memory 30 can be displayed immediately on the CRT 16 by reading the table of contents. it can.

Further, in this embodiment, since the table-of-contents program storage memory 30 is constituted by 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 after the power is turned off. Therefore, there is no need to wait for the arrival of the table of contents program as in the case of changing channels, and the table of contents program can be displayed immediately.

[Effects of the Invention] According to the present invention, since a table of contents program is stored in a data area of a non-volatile memory having a continuous address for each channel, the table of contents program can be instantly displayed when a channel is changed or power is turned on with a simple configuration. It can be displayed, and the waiting time in receiving a desired program can be reduced.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing one embodiment of a teletext receiving apparatus according to the present invention, FIG. 2 is a flowchart for explaining the operation of the embodiment shown in FIG. 1, and FIG. 3 is a partial configuration of the embodiment. FIG. 4 is a memory configuration diagram showing details of a memory. 11 Remote control, 16 CRT, 20 Capture control circuit, 22 Tuning control circuit, 23 Remote control interface, 24 CPU, 27 Display control circuit, 28 Image RAM, 30 ...... Table of contents program storage memory.

Claims (1)

(57) [Claims] 1. A teletext receiving apparatus for receiving a teletext signal including a teletext program and a table of contents program signal indicating a table of contents of the teletext program, comprising: a nonvolatile memory for storing the table of contents program signal for each receiving channel; Channel detecting means for detecting a changed receiving channel; determining means for determining whether or not the table of contents program signal of the changed receiving channel is stored in the nonvolatile memory; The table of contents program signal stored in the non-volatile memory is read and displayed when indicating that the contents program is being stored, and the table of contents program signal newly received from the teletext signal is indicated when the non-storing is not stored. Display means for storing and displaying in a memory, wherein the non-volatile memory includes An index area including a start address and an end address in which a table of contents program signal is stored; and a data area including a memory area having a continuous address where the table of contents program signal is fixed for each of the reception channels. Determines that the index program signal is not stored when the start address and the end address of the index area have the same value, and determines that the index program signal is stored when the start address and the end address are different values. A teletext receiving apparatus characterized by the above-mentioned.