JPS5834691A - Character multiplex broadcasting receiving device - Google Patents

Abstract

PURPOSE:To make it possible that the operator can select either the partial display or the full display, by installing a memory which stores information of one line share after taking out it from the pattern memory which stores character information multiplexly transmitted in the vertical retrace line period. CONSTITUTION:Multiplex information taken out from a video detecting circuit 12 is series-parallel converted and accumulated in a pattern memory 33 through a buffer memory 15. The assignment information of color is contained in a color memory 34. The data accumulated in the pattern memory 33 are coupled with a normal receiver circuit at a compositing circuit 38 and displayed on the full surface of an image receiving tube. On the other hand, an one line memory 41 which stores data of one line share after taking out them from the pattern memory 33 is installed and the one line data can be displayed on a part of the broadcasting screen of the image receiving tube by overlapping the one line data on the data being displayed. This partial display and the full display can be selected by the operators assignment through a keyboard 40. In this way, the display mode can be selected freely.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a teletext broadcasting receiving apparatus that receives and reproduces television signal including text information and the like.

In a teletext broadcasting receiver), image information such as a character 1 figure is transmitted as a digital signal signal.
Let's calculate this data using the sampling test!
The data necessary for displaying one ring is stored in a pattern memory and assembled, and the data is read out and reused in synchronization with the display device. In this kind of receiving device,
When the transmitted data is to be displayed on a display device, the display format is included in the transmitted control code in advance. Therefore, within the receiving device, a processing circuit that processes the character multiplex signal specifies data in the gloss turn memory based on the control code and adds it to the start-up display device. For example, if the control code specifies horizontal scrolling, the display device will display a horizontally flowing display. Also, if you specify full-screen t-,
The data in the pattern memory is read out and displayed on the entire display screen.

According to a conventional teletext receiver such as Sat8C, the display format 11 on the display device is all forcibly determined by the transmitted control code.

However, even though all teletext broadcasts are being received and displayed as described above, there is a desire to watch regular television broadcasts.

This invention was made to deal with the above circumstances,
Display form I in display device! It is an object of the present invention to provide a teletext broadcasting receiving device which allows the user to receive the following information.

Embodiments of the present invention will be described below with reference to the drawings.

To explain the pre-pin signal used in teletext broadcasting.

The format of the television signal used in teletext broadcasting is set as shown in Figure 1.
Figures (a) and (b) show the vertical return period portions of the first field and the arrow field of the composite film IIIk, and ■ is a vertical synchronizing signal.

In the middle part of this Tarui-Kigan period, for example, at the 20th hour after the end of the ware field (a; l Mizuko period),
Teletext/Mother Ke, ToX, and 2 have been removed. The formats of this teletext broadcast are set as shown in FIG. 1 (,).

HIri Mizuho synchronous decoding, 5 is color burst. Teletext Nonakerato 2゛ has part of the header 6゜informations
It is formed by 1. This ° teletext packet 2
The details are as shown in FIG. 1(d).

Immediately, the header part 6 is closed, run-in (cloc).
k runim ) signal CRI, 7 rating codes FC, 7 ID codes IDC, etc.

The teletext packet 2 has its elliptical classes: a control 1 packet, a color code packet, and a pattern data packet. The information section of the control motherboard contains data indicating what kind of content will be sent from now on.For example, the program code (program number J PCI t PO2, page number PAI.

Includes PA2 etc. In addition, the information section of the color-to-four pattern data packet includes color data, pattern data (D-D), etc., as shown in FIG. 1 (-).

To, da part 6, Kuro, clan in No. 16 CRI
is a signal necessary for sampling the data in this teletext packet and for adjusting the phase of the couplers. The framing code FC is a code that indicates the beginning of data. Identification code IDC.

This indicates the display format or transmission signal format, and is a code for separating programs by tR when programs of various display modes are being transmitted together.

The following teletext broadcasts and messages are processed by a system such as that shown in FIG. 2, for example.

Reference numeral 11 denotes an input terminal to which the intermediate frequency of Prevision 1g by teletext broadcasting is input. The signal applied to this input terminal is subjected to image detection by the Eirin detection circuit 12. A waveform shaping circuit 13 that extracts all of the detected composite video signal from one character broadcasting deck and performs waveform shaping.
is man-powered. In addition, the composite video signal is vertically M encoded V
, are input to a synchronization separation circuit 21 that separates the horizontal synchronization signal H'.

a vertical synchronization signal V separated from the synchronization separation circuit 21;
The horizontal synchronization signal H is input to the vertical position counter 22. This vertical position counter 22 is reset by the vertical synchronizing signal V and counts the horizontal synchronizing signal Ht, and it is possible to obtain the extraction/quantity t corresponding to the position where the teletext message is superimposed. can.

The 9-noise pulse obtained by the vertical counter 22 is input to the waveform shaping circuit 13. As a result, the waveform shaping circuit 13 converts the round text broadcasting packet t as explained in FIG.
- Extract and shape the waveform. The output obtained from this waveform shaping circuit 13 is sent to the sampling circuit 14.
The signal is input to the clock run-in signal detection circuit 16 as well as manually input to the clock run-in signal detection circuit 16.

The clock run-in signal detection circuit 16 extracts the clock run-in signal CRI' shown in FIG.
The signal is input to the shoes and russ generation circuit 17. This clock I
f russ generation port w117 is.

It has a function of generating a continuous clock pulse t4 synchronized with the clock and crank-in signals. This black is a continuous black output from the shoes generating circuit 17.

9 lumes are input to the sampling circuit 14,
y”-used as a tasang ring quantity.

In the sampling (b) path 14, various data as shown in FIGS. 1(d) and 1(e) are sampled by the data sampling pulse.

The data is converted from serial to parallel and stored in the memory 15. Generally, the output of the sampling circuit 14 is also input to a framing code detection circuit 18. This frame t
The processing code detection circuit 18 performs a comparison operation between a predetermined 7 reference code and the input code, detects a point where the codes completely match, and detects the starting point f of the data in the buffer memory. :It is something that requires installation and electricity. The frame ringing cord lifting circuit 18 is driven by, for example, the clock pulses and shoes pulses from the horizontal position counter 23.

The horizontal device counter 23 is remotely controlled by the horizontal synchronization code H from the synchronization separation port 21 and counts all the clock pulses from the distribution lock pulse generation circuit 17. The count information of the horizontal position counter 23 is also applied to the address circuit 24. Further, the first Q vertical synchronization signal is also manually input to this address circuit 24. This address [g1MJ4 is the composite video g
Address data regarding the horizontal and vertical directions of the image obtained by I-decoding can be generated.

As shown in ml above, when one character broadcast (1 kerato) arrives, its contents are stored in the buffer memory 15. The data stored in the buffer memory 15 is processed by the microcomputer.

A central processing unit (hereinafter referred to as CPU) 30 decodes the data contents of the buffer memory 15. For example, what is the data format?

What the program is like.

An example will be explained in which it is desired to display a weather forecast sound as a teletext broadcast. If it is desired to display the weather forecast @, a command signal for processing the weather forecast data can be input by operating the keyboard 40f. The weather forecast program is specified by the program code shown in FIG. For example, if the data of program code PCI is sending a weather forecast, this program code)'CI U.

Arithmetic processing is performed by the CPU SO. As a result, it can be seen that the rth of this program code PCI matches the data designated from the keyboard 40, and that the data in the buffer memory 15 is data for the weather forecast. Key? - The command signal specified from the code 40 for reproducing the weather forecast is stored in the random access memory (hereinafter referred to as 14).
(referred to as RAM).

The air forecast pattern data read out from the buffer memory 15 is finally stored in the lean memory 3 as character data and symbol data.
: Force 2 - stored in memory 34.

The data read from the puff memory sled 15 is itself stored in the pattern memory 3 as character data or symbol data.
However, if the transmission method is a code transmission method, the data read from the buffer memory 16 is decoded and a predetermined data is stored in the read-only memory (hereinafter referred to as ROM). character data, tsumashi,
Read out characters, symbols, and graphic data, and convert this to friρ
It may be stored in the online memory 33 or the like. Therefore, furthermore,
Character ROM l9 is prepared.

As mentioned above, based on the data derived from the buffer memory 15, characters, symbols, and graphic data are stored in the arm turn memory 33. Extracting alone does not provide enough data to display one character. Therefore, each time there is a vertical synchronization period and each time the desired program is detected,
The Noreen memory JJK is stored sequentially.

Pattern memory 33. When storing data in the color memory 34, "In which address should this data be stored?"
For example, address designation data specifying a storage address may be input together with the data.

Before! Self/f turn memory 33. When reading and displaying data stored in the color 7' memory 34,
The data in the pattern memory 33 is converted to the @ style via the pattern decoder 35, and the data in the color memory S4 is converted to the @ style via the color decoder 36, and then synthesized at the output interface 7/8 31.

Then, the composite video signal and the gold [1g circuit 38] combine the signals. ) The configuration of the data in the 9-turn memory 31 and the color memory 34 is based on command No. 100 from the CPU 30. The CPU s o constantly decodes address data (corresponding to the current screen beam irradiation position) inputted from the address circuit 24 . This atto, response data is R
AM 3 ; When the desired display designation data set in 1 matches the desired display designation data, the read signals corresponding to these address data are sent to the pattern memory 33. It is added to the cash memory J4.

The display specification data is included in the program stored in the RAM:III.
The display format can be set in various ways according to the switching of the log 2 mode.

When text multiplex signal processing is performed as described above, the display format is 1. Normally, when a teletext message containing a control code is sent, the control code is stored in the RAM 3.
By writing in J, it is used as display designation data.

However, in this device, it is possible to change the display form by adding an external key by operating the - key 4o. That is, when the key 40 is used to designate line display, one line of data is sent from the pattern memory 3J to the 1 line memory 41, and this is sent to the display device via the output interface 37. In other words,
Data in the mother turn memory 33 is sent line by line via the 12-in memory 4Ji. In this case, as shown in Fig. 3, the display screen 42 had a normal full-screen display (display based on the display specification data of the control code).
What appears on the entire screen as shown in a) is shown in Figure 3 (
b) (cl) As shown in (d), one line of display content is sequentially displayed at a certain location on the display screen at a certain time interval.Of course, in this case, the synthesis circuit 18 only displays the text part. Alternatively, the video signal for this one line is deleted, and the other parts are processed so as to remain.

Therefore, with the display as shown in Figure 3 (1), it is possible to view teletext images while viewing video #J by operating this device, even though the current screen cannot be viewed. ,Wear.

Note that the IF in-memory 41 can store data for at least one horizontal line, but it can store data for one character line.
It may be something that can be remembered.

As explained above, this function allows the user to freely change the display format on the display device. It is possible to provide a character multiplex number transmission/reception (!!'v=position) that can be specified.

[Brief explanation of the drawing]

Figure 1 (al~()) is an explanatory diagram for explaining the format of a television signal used in teletext broadcasting, and Figure W42 is a configuration explanatory diagram showing an embodiment of the present invention.
FIG. 3 (11-(dl is an explanatory diagram showing display formats that can be displayed by the device of the present invention. 33...) Arm turn memory, 41... 1 line memory, 42... Display screen. Application Person's agent Patent attorney Suzue Takehiko (a) Mufu (c) Mufu 2 Figure 3 (b) 2 (d) 2

Claims (1)

[Claims] Image information such as characters and figures is superimposed as a digital signal on one horizontal line part of the vertical retrace period of the television signal and is sent as a digital signal, which is sampled using a Sansolingts reference and the data necessary for display is extracted. In a teletext broadcasting receiving device that stores and assembles data in an arm turn memory and reads and reproduces the same in synchronization with a display device, the data in the arm turn memory is read out to a memory capable of storing at least one line in response to a command from an operation unit. Teletext broadcasting reception characterized by having means for temporally separating the data in the gloss turn memory line by line and displaying the data on a part of the display screen by sequentially adding the data to the display device. Device.