JPS5844871A - Pattern information storage device - Google Patents

Abstract

PURPOSE:To store pattern data for a plurality of screen's share with less capacity, by using a data compression and reproducing circuit. CONSTITUTION:A video signal from an input terminal 11 is inputted to a buffer memory 15 via a video detection circuit 12, a wave shape circuit 13, and a sampling circuit 14. Character, symbol and graphic data are stored in a pattern memory 33 based on the data introduced from the buffer memory 15. The data stored in the pattern memory 33 is stored in a plurality of screen memories 57 via a data compression and reproducing circuit 58, and at reproduction, the compressed data stored in the memories 57 are converted into the original pattern data at the data compression and reproducing circuit 58.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pattern information storage device that is effective for use in a system that receives all television signals including text information and performs wagyu beef.

In a teletext broadcasting receiver, image information such as characters and figures is transmitted by digital signals.This is sampled by a data sampling pulse, and the data necessary for display is stored and assembled in a pattern memory. The contents are read out in accordance with the synchronization signal of the display device. In such a receiving device, when trying to store 4-turn data for multiple sides, it is necessary to prepare 4-turn data for multiple sides in the 1,000-turn memo IJ'.
A very large amount of memory was required. In other words, 1
iI! If M bits were required to store 11 pages, 11XM bits of memory would be required to store a plurality of (,) images ml.

This invention has 11 awns to deal with the above circumstances,
An object of the present invention is to provide a data storage device capable of storing all the pattern data for both sides of a sample in a small space.

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

First, the format of the television signal handled by the text-to-multicast receiver to which the present invention is applied will be explained.

The format of the television signal used in teletext broadcasting is set as shown in FIG. Figure 1 (
, ), (b) show the vertical blanking period portions of the first field and the next field of the composite video signal, and ■ is a vertical synchronizing signal.

Teletext packets 1 and 2 are set at the edge of this vertical retrace period, for example, at the 20th H (H: 1 horizontal period) after the end of the previous field. This teletext
The format of Gukerato is set as shown in FIG. 1(c).

H is a horizontal synchronizing signal, and 5 is a color burst.

The teletext packet 2 is formed by a header part 6 and an information part 7. This teletext packet 2 is shown in more detail in FIG. 1(d).

That is, the header part 6 is a clock run-in (cloe
lcrunln) signal CRI, a framing code FC, an identifying code 1' IDC, and the like.

The types of teletext packets 2 include control packets, color code packets, and pattern data packets. The information section of the control packet contains data that indicates the content that will be sent from now on. For example, as shown in Figure 1(d), there is a program code (program number), PCI ,, PC2, page numbers FAI, PA2, etc. are included. The information section of the color code packet and pattern data packet includes color data and turn data (D-D), as shown in FIG. 1(e).

In the header part 6, the clock run-in signal CRI is a signal necessary for sampling the data in the teletext i9 packet and for adjusting the phase of the lock pulse. The framing code FC is a code that marks the beginning of data. identification code I
DC indicates a display format or a transmission signal format, and is a code for identifying when a mixture of programs in various display modes is being transmitted.

The teletext packet as described above is processed, for example, by a system as shown in FIG.

Reference numeral 11 denotes an input terminal to which an intermediate frequency of a television signal based on teletext broadcasting is input. The signal applied to this input terminal is subjected to image detection by the image detection circuit 12.

The video-detected composite video signal is input to a waveform shaping circuit 13 that extracts teletext packets and performs waveform shaping. In addition, the composite video signal includes vertical synchronization signals■,
The signal is input to a synchronization separation circuit 21 that separates the horizontal synchronization signal H.

vertical synchronization signal {circle over (2)} separated from the synchronization separation circuit 21;
The horizontal synchronization signal HFi 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 H, and can obtain a sampling pulse corresponding to the position where the teletext packet is superimposed.

The sampling pulse obtained by the vertical counter 22 is input to the waveform shaping circuit 13. As a result, the waveform shaping circuit 131d extracts the teletext packet described in FIG. 1 and shapes its waveform. The output obtained from the waveform shaping circuit 13 is input to the shaping circuit 14 and also 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. 1(d), and the extracted clock run-in signal is input to the clock pulse generation circuit 17. be done. This clock pulse generation circuit 17 has a function of generating continuous clock pulses synchronized with the clock run-in signal. The continuous clock pulses output from this clock pulse generation circuit 17 are input to the sampling circuit 14,
Used as data sampling pulse.

In the sampling circuit 14, various types of data as shown in FIG. . Further, the output of the sampling circuit 14 is also inputted to the framer code detection circuit 18. This framing code detection circuit 18 detects by comparing a predetermined framing code and the input code, detects all points where the codes completely match, and sets the beginning of data in the buffer memory. It is something to do. The framing code detection circuit 18 is driven by clock pulses from a horizontal position counter 23, for example.

The horizontal position counter 23 is reset by the horizontal synchronization signal H from the synchronization separation circuit 21, and counts the clock pulses from the clock pulse generation circuit 17.The count information of the horizontal position counter 23 is The address circuit 24 also receives the above vertical synchronization signal.

This address circuit 24 can generate address data regarding the horizontal and vertical directions of the image obtained by the currently input composite video signal.

When a teletext packet arrives, the contents of the teletext packet are stored in the buffer memory 15. The data stored in the buffer memory 15 is processed by a microcomputer.

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

For example, let's take the example of a case where you want to display a weather forecast as a teletext broadcast. If it is desired to display the weather forecast, all command signals for processing the weather forecast data can be input by operating the - key 40f. The atmospheric forecast program is specified by the program code shown in the m1 diagram. For example, assuming that the data of the program code PCI is transmitting a weather forecast, this program code PCI is processed by the CPU SO. As a result, this program code PCI
If the data matches the data designated from the keyboard 40, it is understood that the data in the buffer memory 15 is data for the weather forecast. keyboard 3
The command signal for reproducing the weather forecast designated from 5 is stored in a random access memory (hereinafter referred to as RAM).

The gloss turn data of the weather forecast read from the buffer memory 15 is finally stored in the pattern memory 33 as character data and symbol data. The color data is stored in color memory 34.

The data read from the buffer memory 15 is itself character data and symbol data (turn memory 3
However, if the transmission method is a code transmission method, the data read from the buffer memory 15 is decoded and a predetermined character is stored in the read-only memory (hereinafter referred to as ROM). Data, that is, characters, symbols, and graphic data may be read out and stored in the pattern memory 33 or the like. Therefore, a character ROM 39 is further prepared.

As mentioned above, based on the data derived from the buffer memory 15, character, symbol, and graphic data are stored in the pattern memory 33, but only one teletext message is extracted in the vertical period. Therefore, sufficient data cannot be obtained for character display. Therefore, when data is stored in the pattern memory 33 and color memory 34 which are sequentially stored in the turn memory 33 each time there is a vertical synchronization period and each time a desired program is detected,
To determine in which address this data is to be stored, for example, address designation data specifying the storage address may be input together with the data.

The mother turn memory 33. When the data stored in the color memory 34 is read out and displayed, the data in the arm turn memory 33 is converted to direct current via the pattern decoder 35, and the data in the color memory 94 is converted to DC via the color decoder 36. and is combined at the output interface 37 =10-.

Then, it is combined with the composite video signal in a combining circuit 38.

The timing of reading data from the pattern memory 33 and color memory 34 is determined by a command signal from the CPU 3°.

The CPU 30 constantly receives address data input from the address circuit 24 (corresponding to the current screen beam irradiation position).
is being deciphered. When this address data matches the desired display designation data set in the RAM 32, read signals corresponding to these address data are applied to the pattern memory 33 and color memory 34.

The display data is included in a program stored in the RAM 92, and the display format can be set in various ways according to changes in the display designation data and switching of programs.

In the Zara VC1 device, by specifying a certain program, so-called gloss turn data stored in the pattern memory 33 can be transferred to and stored in the multi-screen memory 57. This can be obtained, for example, by a command from the keypad 40, in which case it is recorded in the data in the pattern memory 33 via the data compression/reproduction circuit 58.

This data compression/reproduction circuit 58 is configured as shown in FIG. That is, the output of the thousand-line memory 33 is
After being processed by this compression/reproducing circuit 58, the data is transferred to a multi-screen memory. In this data compression/reproduction circuit 58, 50
is a data compression method that minimizes the required storage capacity by applying a data compression method of M through (M is a positive integer) to all M of the f-turn data read out from the pattern memory 33. is determined and written into the multiple screen memory 57 according to that method, and the data compression method for each 1ii11 blood stored in the index memory 56 and the multiple ii!
i'i, write a code indicating the storage area on the memory surface 7, and convert the compressed pattern data in the multi-screen memory 57 to the original form turn data according to the index memory 56 during playback. (return) (a memory circuit for storing the combination of instruction codes to be omitted in the turn memory 33. 51 is the memory circuit 50
52 is an instruction register for temporarily storing the instruction code read from the storage circuit 50; 53 is an instruction code stored in the instruction register; 54 is a timing control unit for smoothly executing all the above operations;
5 is a working memory for temporarily holding data generated in the process of executing all of the above processes; 57 is a multi-screen memory for compressing and storing the turn data of the counting screen; 56
is the type of data compression performed for each screen stored in the multiple screen memory 57 and the corresponding multiple screen memory 5
This is an index memory in which a code indicating the used area of No. 7 is stored.

The data compression/reproduction circuit 58 is configured as described above. Next, the operation will be explained. First, the keyboard 40 or CP
When a command signal requesting full screen storage processing is output from the main control section of the teletext broadcasting receiving apparatus consisting of ROM 3J, RAM 32, etc., the command register 52 determines this. As a result, the program counter 51 reads out all programs of the data compression method stored in the storage circuit 5° and executes them in the working memory 55. When the program of the data compression method starts execution, (The turn data is read out, this pattern data is compressed, and in that case, it is calculated which 8-counterfeit capacity is required, and the value of the required capacity is temporarily stored. This program During processing, step transitions in the program are decoded by the instruction register 52, and a processing instruction for the next step is outputted via the instruction decoder 53, as well as a timing pulse signal outputted from the timing control circuit 54. Once the capacity required to store the compressed data to which the processing using the first data compression method ends is known, the next program based on the second data compression method is read from the storage circuit 50 by the program counter 51. Yo1
4- When the smallest data compression program required to store all the compressed data is found by selecting multiple data compression programs, the compression method number at that time is stored in the index memory 56, and this method is It can be used to perform data compression processing. The compressed data is stored in the multi-screen memory 57, and the storage area at this time is also stored in the index memory 56 together with the previous compression method number.

On the other hand, for playback, key + l? -Do 40 or CPTJ3
0, ROM 31, RAM 32, etc. from the main control section, the command register 52 decodes this. The song + jlu playback command may specify all of a specific screen among multiple screens, but in this case, the specified screen and a corresponding number are assigned to the index memory 56. The contents of the file are read out. This content is the compression method number and the area of the multiple double-sided memory 57, so 1 [4] of the compressed data in that area is extracted, and a program for playing back the data compressed using that compression method is stored. The data is read out from the circuit 50 and subjected to reproduction processing. The reproduced pattern data is stored in the Fi pattern memory 33 and subjected to display processing.

As described above, by using the data compression/reproduction circuit 58, a plurality of screens can be stored in a small capacity memory. For example, as shown in FIG. 4, the contents of the pattern memory 33 correspond to the number of dots on the display screen.
By performing data compression on the required data, if the next horizontal row is all 0's, it is possible to memorize how many rows are all 0's from the top and from the bottom. , by storing only the data portion surrounded by the dashed dotted line, the "0" portion can be significantly reduced. Therefore, the data surrounded by the dashed-dotted line begins at what column and row (point X in the diagram) of the turn memory.
By memorizing it and remembering it, everything else is ``0'', so you can easily reproduce it by 11 degrees. Also, depending on the data, there may be more "0"s if all "0s" in the column direction are detected, so it is better to employ all such data compression methods and use a method that can be stored in a small capacity.

As described above, the present invention can provide a pattern data storage device that can store all pattern data for multiple sides with a small weight.

[Brief explanation of the drawing]

FIGS. 1(a) to (,) are explanatory diagrams showing the format of the television signal J/signal used in teletext broadcasting, FIG. 2 is a configuration explanatory diagram showing an embodiment of the present invention, and FIG. FIG. 4, which is a block diagram showing the main part of the present invention, is an explanatory diagram of a pattern of memory contents performed by an example of processing by the data compression/reproduction circuit according to the present invention. 33... Pattern memory, 50... Storage device, 51
...Program counter, 52...Instruction register,
53... Instruction decoder, 54... Timing control circuit, 55... Working memory, 56... Index"
51...Multi-screen memory, 58...Data compression and playback circuit. 17-1

Claims (1)

[Claims] A for screen display? There is a pattern memory that stores turn data as a single data amount corresponding to the number of dots used for screen display, and data in this pattern memory is compressed and stored in a multiple screen memory, and when played back, it is stored in the multiple screen memory. A pattern information storage device characterized in that it is completely equipped with a data compression and reproduction circuit that converts stored compressed data into original pattern data.