JPH0230105B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention records image information such as characters and figures, computer program information, etc. on an audio magnetic tape such as a compact cassette tape, and reproduces and displays this on a display device such as a television screen. The present invention also provides a magnetic tape recording method for use in image reproduction and display devices that can be used in fields such as education and entertainment.

The present invention will be explained in detail below with reference to the drawings.

FIG. 1 shows a schematic block diagram of an embodiment of an image reproducing and displaying device used in the present invention, and numeral 1 in the figure is an audio magnetic tape such as a compact cassette tape, which is a well-known suitable tape. The drive mechanism allows it to run at a constant speed. 2 is a playback head, 3 is a tape interface, 4 is a tape running control section, and 5 is a central processing unit (hereinafter referred to as CPU).
6 is a read-only memory for system control fixed programs (hereinafter referred to as ROM);
7 is a random access memory for program data (hereinafter referred to as RAM); 8 is a display RAM; 9
is a display control unit, 10 is a display interface, 11
is the display section.

Figures 2a, b, c, and d show an embodiment of the recording format on the audio magnetic tape used in the present invention.
3 is the running direction of the tape, 14 is the recording format of the display control data block, 15 is the recording format of the image data block, 16 is the recording format of the program data block, 17 is the recording format of the tape running control program data block, and 18 is the dummy. , 19 is the synchronization code, 2
0, 21, 22, 23 are identification (block name) codes for each block, 24 is display control data, 25 is checksum data, 26 is an inverted synchronization code, 2
7 is display memory (RAM) selection data, 28
is image data length data, 29 is display memory (RAM) start address data, 30 is image data, 31 is program data length data, 32 is program memory (RAM) start address data, 33 is program data, 34 is This is tape travel control program data.

First, an explanation will be given of the image reproduction display device shown in FIG. 1 used in the present invention. This device has CPU5
The basics of this system are a tape interface 3 that processes playback signals (data) from the audio magnetic tape 1 and supplies data to the data bus line of the CPU 5, a tape running control section 4 that controls the tape mechanism, and the basics of this system. a control fixed program ROM 6 that stores control programs for executing various operations, a program RAM 7 that temporarily stores application software programs supplied from the audio magnetic tape 1, and a display that stores image data of the application software. A display RAM 8 for displaying on the screen, a display control unit 9 that generates synchronization signals and control signals for display, a display interface 10 that performs processing such as digital/analog (D/A) conversion with the display unit 11, and a television. The display unit 11 includes a display unit 11 such as a digital receiver. In this device, the control program for executing the basic operations of this system is resident in the ROM 6 as a control program in the main body.
Application software programs, image data, etc. are supplied from audio magnetic tapes depending on the software.

Therefore, there are four types of programs and data that are classified based on the functionality of application software supplied from audio magnetic tape: () display control data, () image data, () CPU program, and () tape travel control program data. Composed of blocks. In the embodiment shown in FIG. 1, when the display control data () is reproduced from the audio magnetic tape, this data is processed by the CPU 5, and a control signal (data) is supplied to the display control section, and the display control data to be used is
Controls RAM8 address, range, color specification, scrolling, etc. Furthermore, when the image data in parentheses is reproduced, this data is transferred to the display RAM 8 via the data bus of the CPU 5 and displayed on the display section 11. Furthermore, () of
When the CPU program is reproduced, this program data is transferred to the program RAM 7 via the data bus of the CPU 5, and the application software program is executed. When the tape running control program data in parentheses is reproduced, this data is processed by the CPU 5, and a signal to stop or start the tape running is sent to the tape running control section 4.
to control tape running.

In this way, the recorded content of the audio magnetic tape in this device is functionally classified into four types as described above, and the recording format is determined according to each function to improve data reliability and redundancy. It's getting older. Of course, it goes without saying that the content of the application software is a complex combination of the four data blocks mentioned above.

FIG. 2 shows one embodiment of the recording format on the audio magnetic tape of the present invention, which corresponds to the four blocks of data described above. Note that each data in FIG. 2 is illustrated assuming that one frame is 1 byte (8 bits) of data.
In format 14 of the display control data block,
The dummy 18 is repeated data such as "01", which has no particular meaning as data, and is inserted to reduce distortion due to electrical transient response of each circuit section of the image reproduction display device. That is, if data is suddenly recorded from a silent part, the transient response of each circuit may not be able to follow immediately, causing distortion and preventing correct reproduction of data, so the dummy 18 is inserted.

Then, a synchronization code 19 is recorded after the dummy 18. This synchronization code 19 is a code indicating the start of each data block, and the image reproducing/displaying device detects this code and prepares to receive subsequent data. Next, the block's identification code 20 is recorded. This is a code for identifying the data block, and the image reproducing/displaying device identifies this to determine the subsequent data processing procedure. Here, the identification code of the display control data block is recorded. Subsequently, display control data 24 is recorded, then checksum data 25 for error checking, and inverted synchronization code 26 are recorded. This reversal synchronization code 26 allows the tape to run not only in the forward direction but also in the forward direction when checking the recorded contents when creating application software.
This allows you to check the data while traveling in the opposite direction.When traveling in the forward direction, the beginning of the data can be determined by reading the synchronization code 19, but even when traveling in the reverse direction, the beginning of the data (actually the end of the data block) can be determined. For easy discrimination, the upper and lower digits of each bit of the synchronization code 19 are exchanged, and the inverted synchronization code 26 is set to match the synchronization code when running in the forward direction when running in the reverse direction. For example, if the synchronization code is (00010110), the inverted synchronization code is (01101000).

Now, the display control data block 14 is dummy 1.
8, a series of data has been recorded with the first inverted synchronization code 16, but here we will record the same data again, check for errors with the checksum, and use the correct data. , improving reliability. This is the display control data block 14.
This is because the size of the data is not that large, so the degree of redundancy does not increase.

The image data block format 15 first includes a dummy 18, a synchronization code 19, and an identification code 21.
(image data block identification code) and
Next, the selection data 27 in the display memory is recorded. This display RAM selection data is configured so that the display RAM of the image reproducing display device is divided and used as necessary, and the divided memory is selected. Next is image data length data 2
8. Start address of display memory (address that specifies where to start displaying on the display)
Data 29 and actual image data 30 are recorded.
After that, checksum data 25, inverted synchronization code 26, and dummy 18 are recorded, and this data block is completed. Since this data block has a large data length, it is not recorded twice.

Program data block format 16
is dummy 18, synchronization code 19, identification code 2
2 (program data block identification code),
Program data length data 31, start address data 32 of program memory (RAM) that stores program data, checksum data 2
5. Program data 33, checksum data 25, inverted synchronization code 26, and dummy 18 are recorded in this order. The error check here is performed by checking the checksum, and if an error is found, the tape is run again.

The tape running control program data block format 17 includes a dummy 18 and a synchronization code 1.
9. Identification code 23 (identification code of tape running control program data block), tape running control (control for stopping or running the tape depending on various conditions) program data 3
4. Record the inverted synchronization code 26 in order, and after repeatedly recording the synchronization code 19 to the inversion synchronization code 26 once again, attach the dummy 18. Here, the same data is recorded twice, and if the data match both times, it is considered valid data, and if not, it is reproduced again. In this case as well, since the data length is short, there is almost no redundancy.

In addition, the checksum target in each of the above formats is display control data 2 in format 14.
In format 15, the checksum is from display memory selection data 27 to image data 30. In format 16, the checksum is from program data length data 31 to start address 32.
The checksum up to this point and the checksum of program data 33 are taken.

As is clear from the above description, the image reproducing and display device using the magnetic tape recording method of the present invention uses an audio magnetic tape as a medium, records and reproduces application software programs, data, etc. on the audio magnetic tape, and records and reproduces the image and the CPU. It is a system that integrates the functions of the program. The recording method of the present invention allows data to be recorded on a tape to be recorded in a format that is functionally divided into four types, thereby making it possible to create a format suitable for the function of each data, and making it possible to finely correspond to application software. Can be done. For example, since these four types of formats are independent of each other, by recording and transmitting the image data first and recording and transmitting the display control data one after another, it is possible to use different display methods for the same image data. You can make a difference.

[Brief explanation of drawings]

FIG. 1 is a schematic block diagram of an embodiment of the image reproducing display device of the present invention, and FIG. 2 a, b, c, and d are pattern diagrams showing examples of recording formats on the audio magnetic tape used in the present invention. It is. 1, 12... Audio magnetic tape, 2... Playback head, 3... Tape interface, 4...
Tape running control unit, 5...CPU, 6...Control fixed program ROM, 7...RAM for program,
8...Display RAM, 9...Display control unit, 10...
...Display interface, 11...Display section, 14...Format of display control data block, 15...Format of image data block, 16...Format of CPU program data block, 17...Format of tape travel control program data block. Format, 18...Dummy, 19...Sync code, 20, 21, 22, 2
3...Identification code, 24...Display control data, 2
5...Check sum data, 26...Reverse synchronization code, 27...Display memory selection data, 28...
...Image data length data, 29...Start address of display RAM, 30...Image data, 31...Program data length data, 32...Program
RAM start address, 33...program data, 34...tape travel control program data.

Claims (1)

[Claims] 1. Recording of display control data, image data, program data, and tape running control data in an image reproducing display device characterized in that image information, programs, and control data are supplied from an audio magnetic tape. The formats are respectively a display control data block, an image data block, a program data block, and a tape travel control data block. an identification code for identifying the type of data, the display control data, checksum data, and reverse synchronization that is set so that the same data as the synchronization code is reproduced when the audio magnetic tape is run in the opposite direction. A magnetic tape recording method in which a code is sequentially recorded, and then the same data is recorded twice by sequentially recording from the dummy to the inverted synchronization code, and finally a dummy is added to form a data block. 2. The image data block is defined as the dummy, the synchronization code, the identification code, the selection data of the display random access memory, the data length data of the image data, the start address data of the display position on the display, the image data, 2. The magnetic tape recording method according to claim 1, wherein the data block is formed by sequentially recording checksum data, the inverted synchronization code, and the dummy. 3. Put the program data block into the dummy,
The synchronization code, the identification code, the data length data of the program data, the start address data of the random access memory that stores the program, the checksum data, the program data, the checksum data, the inverted synchronization code, and the dummy are sequentially A magnetic tape recording method according to claim 1 or 2, wherein the magnetic tape is a recorded data block. 4. In the tape running control data block, the dummy, the synchronization code, the identification code, the tape running control data, and the inverted synchronization code are sequentially recorded, and then the inverted synchronization code is sequentially recorded from the synchronization code again, so that the same operation is performed. Record the data twice,
3. A magnetic tape recording method according to claim 1, wherein said dummy is added at the end of said data block.