JPS62231577A - Teletext receiver - Google Patents

Abstract

PURPOSE:To smooth a display at the time of a writing action on a screen by constituting such that a piece of data in a function block composed of plural lines can be written by allocating them to attribute memories for every line. CONSTITUTION:Data of 4-dots x 1-line obtained by quatering the minimum unit 30 of the function block is allocated to four attribute memories 2, 4, 6 and 8(the 1st-fourth memories) including 4 dots X l-line for every line and written in them. When data is written in an attribute memory 31 and a pattern memory, pattern data of one line is written in the 1st pattern memory in the pattern memory 32, after which attribute data of one line is written in the 1st attribute memory 2 in an attribute memory 31. After pattern data of one line is similarly written in the 2nd pattern memory 3, attribute data of one line is similarly written in the 2nd attribute memory 4.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a teletext receiving device, and in particular,
Display attributes (coloring, flashing) of display memory for writing figure pattern data.

The present invention relates to a teletext receiving device that improves the allocation of attribute memory for writing data for controlling concealment, etc., so that screen display becomes smooth (natural).

(Prior technology) Recently, a new broadcasting service has been teletext broadcasting (hereinafter referred to as
teletext) has been put into practical use.

Furthermore, there is a hybrid method that combines the disadvantages of the conventional pattern method with a code method having good (high) transmission efficiency.

Unlike regular television programs that are organized by time, teletext repeatedly transmits various information and entertainment programs consisting of text, graphics, and additional sounds, allowing viewers to access the information they want when they want it. This is a new broadcasting system that has made it possible to

The above-mentioned information such as letters and figures is multiplexed and broadcast on the teletext radio waves (video signal @) from the broadcasting stations currently broadcasting, and the receiver must have a receiving device or adapter that can receive teletext. If you prepare one, you can select and watch the teletext program you want from among many teletext programs.

Furthermore, this teletext signal (text signal packet) is transmitted as a digital signal using the time gap (i.e., vertical blanking period) of the current television signal, and the receiving device side receives the signal. It decodes and converts it into a television signal, displays images on the television screen, and emits additional sounds such as music, so that text programs can be viewed.

The above receiving devices and adapters consist of a character decoder,
An example of the configuration of this character decoder is shown in FIG.

In the figure, a character decoder separates and extracts a character signal from a demodulated video signal (television signal) supplied via an input terminal 1, and converts the character data into I! The screen is displayed in various display formats and additional sounds are played back. These signal processes are performed using a microprocessor (CPU) 10.

The synchronization separation circuit 2 generates a gate pulse to separate character signals, and also reproduces a byte synchronization signal, a hit synchronization signal, etc., which is necessary to reliably provisionally output a specified data bucket. The timing signals are supplied to the waveform enrichment circuit 32, the character signal separation circuit 4, and the display clock generation circuit 12, respectively.

The waveform equalization circuit 3 compensates for waveform distortion caused by the source l- or the intermediate frequency amplification circuit of the receiver.

The character signal separation circuit 4 separates the character signal from the video signal using the gate pulse generated by the synchronization separation circuit 2, performs code identification at the timing of the clock signal, and performs Ml, rO
This is to extract the digital data of J.

The error correction circuit 5 corrects code errors occurring during signal transmission, and for this error correction, for example, a method capable of correcting errors of up to 8 bits in one data packet is adopted.

The character data whose errors have been corrected in this manner is taken into the buffer RAM G via the pass line and decoded. This decoding procedure is processed according to the decoding procedure written in the program ROM 7.

Furthermore, characters and figures are generated by accessing a character generator (character and figure pattern generator) 8. Note that 9 is a work ROM.

Furthermore, the generated character/graphic pattern data is written into the display memory 11 and read out in synchronization with the horizontal and vertical scanning cycles. The read pattern data is then converted into analog R, G, and B signals by the color matrix circuit 14, applied to a picture tube (not shown), and displayed on the screen. Note that 13 is a display control/bus control circuit.

The display memory 11 described above is composed of a pattern memory Ila and an attribute memory 11b. The pattern memory 11a is for writing shape data such as character shape patterns and various mosaic patterns.

Further, the attribute memory 11b is used for coloring the foreground color and the background color.

This is used to capture data related to display attributes such as flashing 7 concealment. Set this display attribute to 1111
The unit to be controlled is called a functional block, and its size can be specified as a section four times the length and width (4 dots x 4 lines) of the smallest logical pixel (dot).

That is, as shown in FIG. 3(a), the minimum unit 20 of the functional block is 4 dots x 4 lines, which corresponds to the attributes of 4 dots x 1 line as shown in FIG. 3(b). It is allocated to the memory 21 and written.

(Problem to be Solved by the Invention) However, as described above, since the attribute memory 21 is allocated to each of the minimum units of 20 functional blocks (4 dots x 4 lines), it is difficult to set the attribute of the corresponding block. Then, 4 dots x 4 lines are colored all at once, resulting in a problem that the display on the screen during the writing operation becomes unnatural.

That is, as shown in FIG. 3(C), when the attribute memory 21 is filled with 4 dots x 4 lines after the pattern memory 22 is filled with 4 dots x 4 lines, the pattern memory 22 is filled with 4 dots x 4 lines. (From the end of writing to the attribute memory 22 until the end of writing to the attribute memory 21, the display is performed using the previous 8 (data) that has already been written to the attribute memory 21. - Shun, the color is unnatural and the display looks unnatural.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a teletext receiving apparatus that can solve the above-mentioned problems of the conventional technology and make the display smooth (natural) during the writing operation on the screen. do.

(Means for Solving the Problems) In order to achieve the above object, the present invention receives a character signal superimposed within the vertical blanking period of a television signal, and stores data of this character signal in a pattern memory. In a teletext receiving device that allows display to be performed in writing to a display memory consisting of an attribute memory and an attribute memory, data of a functional block consisting of a plurality of lines is written by allocating an attribute memory for each line. The present invention provides a teletext receiving device characterized by having the following configuration.

(Function) In the teletext receiver having the above configuration, after one line of data is written into the pattern memory, one line of data is written into the attribute memory corresponding to that line.
Do this alternately.

(Embodiment) An embodiment of the teletext receiver according to the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing the configuration of a display memory which is a main part of an embodiment of a teletext receiving apparatus according to the present invention.

As shown in FIG. 1(a), the minimum unit 30 of a functional block consisting of 4 dots x 4 lines is further divided into 4 lines (4 dots x 1 line) in line units.

Further, as shown in FIG. 1(b), the attribute memory 31 has four
Four attribute memories of dots x 1 line ■, ■, ■, ■(
(first to fourth attribute memories).

Then, as mentioned above, the minimum unit of functional block 30 is set to 4.
Data for 4 dots 1 × 1 line divided into 4 attribute memories of 4 dots × 1 line are stored for each line.
Allocate them to (1), (1), and (1) (first to fourth attribute memories) so that 1 is stored in each of them.

Further, the above-mentioned attribute memory 31 includes a foreground color memory, a background color memory, a flashing memory, etc., and data is allocated and written to each of them as described above.

Furthermore, when writing data to the attribute memory 31 and the pattern memory described above, one line of pattern data is written to the first pattern memory 2 of the pattern memory 32 as shown in FIG. 1(C). After writing, one line of attribute data is written to the first attribute memory ■ of the attribute memory 31, and then one line of pattern data is written to the second pattern memory ■. Similarly the second
Write one line of attribute data to the attribute memory ■.

Then, write one line of pattern data to the third pattern memory ■ → write 1 to the third attribute memory ■
Writing is performed in the following order: writing attribute data for a line → writing pattern data for one line to the fourth pattern memory ■ → writing attribute data for one line to the fourth attribute memory ■ .

By performing store loading in this way, the screen is smoothly (naturally) loaded from top to bottom (or from bottom to top).

As described above, attribute memory (foreground color memory, background color memory, flashing memory, etc.) corresponding to 4 dots x 1 line is allocated to each line, and one line of display pattern data is written to the pattern memory. On the other hand, by writing the data of the corresponding line into the attribute memory alternately line by line, the screen can be displayed smoothly (naturally).

(Effects of the Invention) As described above, according to the teletext receiving device of the present invention,
It has the feature that the screen display can be made smooth (natural) from top to bottom (or from bottom to top).

[Brief explanation of drawings]

FIG. 1 is a diagram showing a configuration related to a display memory which is a main part of an embodiment of a teletext receiver according to the present invention, FIG. 2 is a diagram showing an example of the configuration of a character decoder, and FIG. FIG. 2 is a diagram showing a configuration related to a display memory of a broadcast receiving device. DESCRIPTION OF SYMBOLS 11... Display memory, 11a, 32... Pattern memory, 11b, 31... Attribute memory, 30... Minimum unit of another side block, ■, ■, ■, ■... 1st to 1st 4 pattern memory, ■
,■,■,■...first to fourth attribute memories. ((1) (b)
(C)=1゛ i C2] (ku),
tb)
3 mouths

Claims (1)

[Claims] A character signal superimposed within a vertical blanking period of a television signal is received, and data of this character signal is written into a display memory composed of a pattern memory and an attribute memory to perform display. What is claimed is: 1. A teletext receiving device characterized in that the teletext receiving device is configured such that data of a functional block consisting of a plurality of lines is written by allocating an attribute memory for each line.