JPS63189082A - Teletext receiver - Google Patents

Abstract

PURPOSE:To effectively utilize a memory by storing a teletext signal as brightness signal into a picture/memory while omitting chrominance information. CONSTITUTION:A television video signal inputted from a television video signal input terminal 1 is subjected to extraction of a teletext signal by a data clock generating circuit 4 and converted into a digital signal. Then a program data per 1Vd is stored in a packet buffer 7 via a BEST 6. A program data stored in a packet buffer 7 before the next Vd period is subjected to picture processing as brightness information while omitting chrominance information by a main CPU 9 and transferred to a picture memory 15 and stored. As the processing above, it is executed at the Vd period and the program data of a teletext is stored in the picture memory 15. In selecting an object program number by a remote controller 30, the program data is extracted from the picture memory 15 as the brightness information and the designated program is displayed by a black/white picture.

Description

Detailed Description of the Invention "Industrial Application Field" The present invention has a screen memory for storing a teletext signal,
This invention relates to a teletext receiver in which color information is omitted and stored as brightness information in order to effectively utilize screen memory.

``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.

Therefore, it is conceivable for the user to store the designated program in a memory so that it can be received and displayed immediately after selection. However, as the number of programs and pages increases,
There was a problem in that it required an extremely large capacity of memory.

The present invention has been made to solve the above-mentioned problems, and includes a circuit for extracting and processing a teletext signal from an input television video signal, and a circuit for extracting and processing a teletext signal from an input television video signal. A circuit for converting a broadcast signal into a digital signal, a program data storage memory for storing the converted signal, and instructions and characters for omitting color information from the teletext signal and storing it as luminance information in the program data storage memory. A program ROM that issues broadcast image processing commands, a command to selectively read program data from the program data storage memory, and a CPU that performs control for omitting color information, image processing commands, and selective readout control. It is equipped with.

"Operation" The teletext program data extracted from the television video signal is stored in memory as luminance information by omitting color information from the teletext signal. When the program is read from the memory, the designated program is immediately displayed in black and white 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 (lO) to a teletext program ROM (11), an image memory (15) for omitting color information from the teletext signal and storing it as luminance information and image processing, and a CG ROM ( 16), printer interface (17), melody processing CPU (18)
), CRTC (19), system control cpU (20)
are connected to each other.

The upper CPU (9) is also connected to an interrupt circuit (21), the printer interface (17) is connected to an external device printer (22), and the melody processing CPU (18) is connected to an interrupt circuit (21). Buffer data RAM
(23) and a sound source circuit (24) are coupled, and this sound source circuit (24) is coupled to a TV interface (25). The CRTC (19) has V-RAM (2
6) is coupled, and the TV interface (25) and RGB encoder (27) are coupled, and this TV interface (25) and RGB encoder (27) are connected to the TV connection terminals (28) and (29). combined.

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.

A television video signal inputted from a television video signal input terminal (1) is subjected to a data clock generation circuit (4) in which a teletext signal is extracted and converted into a digital signal. Then, program data per jVd is stored in the bucket buffer (7) via BEST (6). Before the next Vd period, the program data stored in the bucket buffer (7) is processed by the main CPU (9) by omitting the color information from the teletext signal and converting it into luminance information, and then image-processed into the image memory (15). ) and stored. The above operations are performed in Vd cycles to store teletext program data in the image memory (15).

Now, when you select the desired teletext program number using the remote control (30), the light receiving section (31) and system control C
Program selection number data is sent to the main CPU (9) via the P U (20). Then, the program data of the program selected by the main CPU (9) is taken out from the image memory (15) as brightness information, and the designated program is displayed in black and white.

[Effects of the Invention] Since the present invention is configured as described above, color information that occupies about half of one teletext signal can be omitted, and memory can be used effectively. Additionally, there is no waiting time of 20 to 30 seconds on average as in the past, and the designated program is displayed in black and white as soon as it is selected.

[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)... CPU, (10)...
・Pass line, program ROM for (11), (15)
... Screen memory, (20) ... System control CP
U, (30)...remote control, (31)...light receiving section.

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, a program data storage screen memory that stores the converted signal, and a character broadcasting circuit. A command to omit color information from a broadcast signal and store it as brightness information in the screen memory for storing program data, a command for image processing of teletext, and a command to selectively read program data from the screen memory for storing program data. A teletext receiver comprising a program ROM and a CPU that performs control for omitting color information, image processing control, and selective readout control.