JPS6039985A - Portable character broadcast receiver - Google Patents

Abstract

PURPOSE:To obtain simply only character information for a portable at any place by writing the data of a program number set by an external keyboard to a memory for one pattern's share, reading the data and receiving the image of a character broadcast. CONSTITUTION:A high frequency circuit including an antenna receiving and demodulating a TV radio wave is provided before a decoder 11. The character/pattern information demodulated and selected by the decoder 11 is stored in a pattern memory 12. A data from the memory 12 is fed to an LCD driver 14 driving the lateral dot of a liquid crystal panel LCD16 through a controller 13. On the other hand, the longitudinal axis of the liquid crystal display panel LCD16 is driven by a driver circuit 15 generating a time division drive pulse by means of a timing signal from the controller 13. Further, the controller 13 generates an address signal to read sequentially the memory 12. Thus, the pattern data for pattern's share transmitted from the character broadcast is displayed on the LCD16 in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a small and portable receiver dedicated to teletext broadcasting.

(Prior Art) Teletext broadcasting is a system in which text and graphic information are converted into dinocils, superimposed on a television video signal, and transmitted, and the receiver decodes this signal and displays it on a screen.

There are two types of transmission methods: the multi-turn transmission method, in which the screen is divided into pixels and transmitted, and the code transmission method, in which characters and figures are encoded and transmitted as code signals.

Here, an example of a decoder using a pattern transmission method will be described.

A teletext screen is composed of pixels of 248 horizontal x 2 o/I dots, and is designed to display characters and graphics. Then, on the transmitting side, the screen is sequentially scanned in the horizontal direction and converted into 0 and 1 signals corresponding to black and white.

In addition, there are 8 types of color information, and the screen consisting of the above pixels is 8 dots horizontally x 12 dots vertically.

It is sent at 1r- position.

These characters, graphics, and color information are transmitted while being superimposed on one predetermined horizontal timing signal section within the vertical retrace section of the TV signal.

The data unit of this horizontal synchronization signal section is data
It is called 1.

As shown in FIG.
, and a control code C having an error correction code.
It is composed of an information data section 22 that transmits symbols, characters, graphic information data, color information data, page control data, and the like. Note that 23 indicates a horizontal open 11J] signal, and 24 indicates a color burst. This 1 data Gukerato information data part 22
It is possible to transmit the code of one horizontal row of pixels on the screen, color processing, and query rows.

The number data packet includes a program number, a control target for transmitting data related to the control of the entire page (-), a color code packet for transmitting color information for each row of color blocks, It is composed of data for pixel transmission, etc., and transmits data for one screen.

On the receiver side, the teletext information thus superimposed on the vertical retrace interval is demodulated by the decoder circuit shown in FIG. 2 and displayed on the cathode ray tube.

This block diagram of the decoder circuit shows the circuit blocks after demodulating the video signal from the TV radio waves. In the figure, l demodulates a normal TV signal, modulates it to 0, and activates a cathode ray tube through a video switching device 4.

On the other hand, the data for teletext is generated in the resampling and lasing generator 2 by the color side transmission wave FSC, and the clock data CR4% in the text data is generated in the resampling and lasing generator 2. ;;f[Separated from normal video signal in circuit 3.

Each separated character data block 1 is recorded in IH memory (1 horizontal scanning line memory) 4 (and 1
The control code C in the header section 2) in the packet is 1 bit, 1, with a Hamming code capable of error correction added.
This error correction 7E is performed by the error correction and decoder circuit 5.

To identify A and G, select the program number and page number data specified by the keyboard 6, and store the data in the pattern memory 7 and color memory 8, respectively. Zeru. The color matrix 9 is a circuit that generates R, 'G, and 13 outputs in accordance with the color signals from the eight areas of the camera memory 8.

The R, G, and B outputs demodulated in this way are the normal T
V image reception] The R, G, and B outputs demodulated by the receiver are selected by the switch 10 and drive Brownian compensation. Although a literary broadcast receiver can be realized by using a normal cathode ray tube to receive TV images (built-in or by adding an IY8 character adapter), it is not practical for portability, which is the purpose of the present invention.

゛However, in portable TV receivers that have an LCD-e channel display, the TV radio wave reception demodulation unit is relatively sophisticated, and an AD converter for data conversion is required, and a teletext decoder is required. Adding a circuit increases the circuit scale, which has drawbacks such as an increase in price and a larger size.

(Object of the Invention) The object of the present invention is to eliminate such conventional deficiencies and to make it portable so that only character tFj' information can be easily obtained anywhere.

(Structure of the Invention) The present invention includes an antenna circuit! The teletext signal is separated from the video signal demodulated by the JTV radio wave reception/adjustment circuit, the data is decoded and error corrected by the lever 9 circuit, and the data is set using an external keyboard. Sa'i''
L program number (D data is written in the memory circuit for one side, and the data is sequentially read out and displayed. (The 1U drive circuit drives the character/figure input/column display by 1 to receive the teletext. An embodiment of the present invention will be described in detail below with reference to the drawings.

(Embodiment) FIG. 3 is a block diagram of essential parts showing one embodiment of the portable teletext receiver of the present invention. In the figure, T demodulated to 11
The second decodes only the reverse character/graphic information from the V video signal.
In the figure, a decoder 5 including a sampling pulse generator 2, a data separation circuit 3, an IH memory 4, and an error correction circuit,
This is a character information data decoder composed of a keyboard 6 for program selection.

In order to configure a teletext receiver, a high frequency circuit including an antenna for receiving and demodulating TV waves is placed in front of the decoder 11. The decoder 11 also stores the character/graphic information l-1 selected by the decoder 11 into the pattern memory 12. Here, the turn memo l) l2 is essentially the same as that described in the conventional example. Color memory is omitted in this explanation because only character information is displayed in this embodiment, but it will of course be included if a small display device that can easily and inexpensively display color is put into practical use. It is.

・The circuit after pattern memory 12 is pattern memory 12.
This circuit drives a multi-dot liquid crystal display channel 16 (hereinafter referred to as LCD-e channel) on which literary figures stored in the LCD can be displayed.

This type of LCD/'pnel 16 is currently being put into practical use in No. 1711 teletext receivers such as No. No. 1711, such as No. Obviously it can be done.

The data from the pattern memory 12 passes through the controller 13 and is displayed on the LCD panel 16 in the horizontal direction.

The signal is sent to the LCD driver 14, which drives the gate. L
Since the response speed of the CD panel 16 is relatively slow, the turn data is stored in a memory circuit that has a one-to-one relationship with the LCD driver built into the -tan driver 14, and data for one horizontal column is simultaneously output and displayed on the LCD. Drive panel 16.

On the other hand, the vertical direction 6'↓ of the LCD-e channel 16 is driven by a driver circuit 15 which generates five time-divided drive pulses according to timing signals from the controller 13. Further, the controller 13 sequentially generates address signals for sequentially reading out the memory 12. of course,
I, CD The vertical time division of the panel 16, the drive pulse and the address scanning signal are synchronized.

In this way, one screen (2
48 x 204 do, g) noma turn desk is LCD-e
Displayed on Nernoro.

Note that since the LCD panel 16 is small, it does not have all 248 x 20/l dots, but half of the 12 dots, for example.
Even 8x102 dots and gs provide sufficient resolution.

In this case as well, it is sufficient to scan one vertical scanning line for every two horizontal scanning lines in the same way as described above.

Further, the keyboard 6' for specifying the program number and wave number can be arranged near the LCD panel 16 as shown in FIG. 4, and can be of a keyboard type.

In this way, in the first embodiment, the teletext-only image reception can be made portable, so the necessary information can be accessed at any time.
You can get it no matter where you are.

This is a great advantage for those who require timely information, as they can obtain weather forecasts, sports news, traffic information, and stock news that are scheduled to be sent via teletext at any time. . Furthermore, it is currently being commercialized. +? It is obvious that the construction of portable TVs such as 7L-TVs and wristwatch-type TVs is simple.

The keyboard of the teletext display screen and program can be used as the display and operation keys of a calculator or hand belt computer to send and receive the number of characters (combined fhi with the elephant key and other functions). For example, if we take the example of a calculator, adding a calculator function can be achieved by adding one IC.

If this is done, it will have the characteristics of a comprehensive information device, and the effectiveness will be even higher.

Indeed, if a switching function υ1j is added to the pattern memory so that input from the key Je-1 can be stored, it can also be applied as a data storage device.

(Effect of the invention) As explained in detail below, the present invention
It has a simpler structure than V, and has the effect of allowing you to access various information whenever and wherever you need it. Note that it is easy to combine the display with a product that requires a display and a key switch, such as a calculator. Therefore, it is a field of application for mobile phones! Can be used as an I device.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a teletext data packet, FIG. 11 is a block diagram of a teletext decoder, and FIG. 3 is a block diagram of essential parts of an example of a portable teletext receiver according to the present invention.
FIG. 4 is an external view of a receiver according to the present invention. 1 Video signal processing circuit, 2 - Zanopring/Grus generation 2 ;), 3 - Data division circuit, 4... IH memory, 5... Erroneous word] correct and decoder circuit, 6 - Keyboard, 7 - η turn Memory, 8 Color memory, 9 Force-based Ramatosu, Cus, lO/video, switch, 11...Character information data decoder, J2...iE turn memory, 1
3 controller, 14 ・LCD driver for data,
15...LCD driver for Sugyan, 16...LCD
Nogunel. Patent author: Okiichi Ki Kogyo Co., Ltd.

Claims (1)

[Claims] 1. Separating teletext data from a video signal demodulated by a TV radio wave reception/demodulation circuit including an antenna circuit, decoding the data and correcting errors by a decoder circuit,
Writing the data of the Zoko program number set by the external keyboard into the memory circuit for one screen, reading out the data sequentially, driving the display device for displaying characters and graphics by the display drive circuit, and receiving the teletext broadcast. A portable teletext receiver featuring: 2 Gibo-1 and display unit can be used for other functions.
Claim No. 1 characterized in that it is a portable device.
Portable teletext receiver described in Section 1. 3. Claim 1, characterized in that the memory circuit is capable of storing input data from a keyboard.
Portable teletext receiver described in Section 1.