JPS63189071A - Teletext receiver - Google Patents

Abstract

PURPOSE:To display a designated program without any waiting time by storing a program data of a designated channel while being subject to picture processing till the limit of memory capacity after the memory is all cleared at the time of turning on a power supply or switching a channel. CONSTITUTION:When the power supply is turned on or the channel is switched by a remote controller 30, all program data stored in a pattern memory 15 are cleared and the program data of a channel designated newly is subject to picture processing and stored till the limit of capacity of the pattern memory regardless of the program content or the program number. In such a case, a television video signal inputted from a television video input terminal 1 is subject to extraction of a teletext signal by a data clock generating circuit 4 and converted into a digital signal. Then a program data for 1Vd is stored in a packet buffer 7 and transferred sequentially in the pattern memory 15.

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a teletext receiver that processes and stores teletext signal data in a screen memory until the capacity is full. .

``Prior Art'' In general, in teletext broadcasting, the sending interval of one page is set at 20 to 30 seconds or less in consideration of reading time and other factors. Therefore, even if a program or page is selected, it will be displayed for a certain period of time. 'However, as a user,
It was desired that when a certain channel was selected, the programs in that channel could be displayed immediately.

Means for Solving the Problems The present invention has been made to solve the above-mentioned problems.The present invention has been made to solve the above-mentioned problems. A circuit for converting a teletext signal into a digital signal, a screen memory of a certain capacity for image processing and storage of the converted teletext signal, and a screen memory for storing image processing instructions for the teletext signal, when turning on the power or switching channels. A clear command, a command to store the image-processed program data of the cleared channel until the memory is full, and a program RO to command the selective reading of program data from the memory.
M, image processing control, clearing and storage control of the memory,
It is equipped with an image processing microprocessor that performs selective readout control.

1. When the power is turned on or the desired teletext channel is selected using the remote control, all previously stored program data in the screen memory is cleared and the program data of the newly selected channel is used as the program content. Images are processed and stored until the memory capacity is full, regardless of the number of programs. Then, when a program within that channel is designated, the designated program is immediately displayed from among the stored programs.

"Example" Hereinafter, one embodiment of the present invention will be described based on the drawings.

(1) is a TV video signal input terminal, and a synchronization signal generation circuit (3) and a data clock generation circuit (4) are connected to this video signal input terminal (1) via a waveform equalization circuit (2). This data/clock generation circuit (4) is coupled to an error correction circuit (6) via an interface (5), and is further coupled to a bucket buffer (7) for temporarily storing program data, as well as a path. Buffer (8)
is combined with (9) is the main CPU, and this main CPU
U (9) is connected via a pass line (10) to a teletext program ROM (11), a screen memory (15) for image processing and storage of teletext signals, and a CGROM (16).
, a printer interface (17), a melody processing CPU (1B), a CRT C (19), and a system control CPU (20).

The main CPU (9) is also coupled with an interrupt circuit (21), the printer interface (17) is coupled with an external device printer (22), and the melody processing CPU (18) is coupled with an interrupt circuit (21). Buffer data RAM (
23) and the sound source circuit (24) are combined, and this sound source circuit (
24) is coupled to the TV interface (25). The CRTC (19) 4: is connected to the V-RAM (26) and the TV interface (25).
) and RGB encoder (27) are combined, and this TV interface 7 x -X (25)
:l-da (27) is coupled to the TV connection terminal (2g) (29).

The system control CPU (20) includes a remote control (
30) is coupled to the light receiving section (31), and the system reset output terminal (32) and power on/off terminal (
33) is connected.゛The operation of the circuit configuration as described above will be explained.

When the power is turned on or the channel is changed using the remote control (30), all program data stored in the screen memory (15) will be cleared, and the program data of the newly specified channel will be updated to the program content, programs, and number of programs. Regardless, the image is processed and stored until the capacity of the screen memory (15) is full. The operation up to this storage will be further explained. The television video signal inputted from the television video signal input terminal (1) is extracted as a teletext signal by a data clock generation circuit (4), and is converted into a digital signal.

bucket buffer (7) via BEST (6).
) program data per IVd is stored in memory. Next Vd
Before the end of the period, the program data stored in the bucket buffer (7) is sequentially transferred and stored in the screen memory (15) by the main CPU (9). The above operation is performed in Vd cycles, and data is stored until the capacity of the screen memory (15) is full.

Now, when a program number of a stored channel is selected using the remote control (30), program selection number data is sent to the main CPU (9) via the light receiving section (31) and the system control CPU (20). Then, the program data of the selected program is retrieved from the one-screen memory (15), the designated program is immediately displayed, and the page of the program can be moved up and down.

"Effects of the Invention" As mentioned above, the present invention stores programs on a certain channel until the memory capacity is full, so there is no waiting time of 20 to 30 seconds on average as in the past, and the programs are displayed immediately after selection. Specified programs can be displayed.

Since the teletext signal is image-processed and stored in the screen memory, it can be reproduced and displayed at particularly high speed.゛、

[Brief explanation of the drawing]

The figure is a block diagram showing an embodiment of a teletext receiving apparatus according to the present invention. (1)...TV video signal input terminal, (7)...Bucket buffer, (9)...Main CPU, (10)...
・Pass line, (11)...Program ROM, (1
5)...screen memory, (20)...system control CPU, (30)...remote control, (31)...light receiving unit.

Claims (1)

[Claims] (1) A teletext circuit that extracts and processes a teletext signal from an input television video signal, a circuit that converts the teletext signal into a digital signal, and a circuit that processes and stores the converted teletext signal as an image. a capacity screen memory, an image processing command for a teletext signal, a command to clear the memory when the power is turned on or a channel is changed, a command to store the image-processed program data of the channel after clearing until the memory reaches its capacity. , a program ROM that commands selective readout of program data from the memory, and an image processing microprocessor that performs image processing control, clearing and storage control of the memory, and selective readout control. Characteristic teletext receiver.