JPH0437429B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a stereo cassette tape used in a learning data reading device and the like.

[Prior Art] Stereo cassette tapes have been known in which a sound signal is stored on one track of the stereo cassette tape, and program data and image data (video data) are stored on the other track.
This type of stereo cassette tape is used, for example, as a recording medium for learning equipment, and images and sounds are generated in accordance with the execution of a program (see, for example, Japanese Patent Laid-Open No. 55-26767).

[Problem to be Solved] In conventional stereo cassette tapes, program data and video data are located at different positions within the same track. However, the tape itself does not clearly indicate whether the data to be reproduced next is program data or video data, leading to malfunctions.

SUMMARY OF THE INVENTION An object of the present invention is to provide a stereo cassette tape in which it is possible to easily determine whether the data to be reproduced next is program data or video data.

[Embodiments] Preferred embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is a CPU, 1a is an address bus for switching connections between blocks, 1b is a data bus for transmitting data signals between blocks,
2 is a ROM involved in the operation of the CPU, and 3 is a program into which program data 33, which will be described later, is read.
RAM, 4 is a multiplexer, 5 is a video RAM into which video data 32 (described later) is read and addressed by the multiplexer 4, 6 is an interface for converting the serial data signal 7a into parallel data, and 7 is a large computer (not shown) on the cassette tape. 8 is a video controller that converts the output of the video RAM 5 into video signals 8a, 8b, 8c corresponding to red, green, and blue; 9 is a video signal 8a, 8b,
RF modulator that modulates 8c with RF (carrier wave) and converts it into video output 9a, 10 is video output 9a
11 is the monitor TV that displays the image.
This is a light pen that can specify coordinates etc. via 10.

The external memory 7 is composed of a cassette tape 20 as shown in FIG. 2, with one of the left and right stereo channels serving as a data track 21 and the other as an audio track 22. Further, the external memory 7 is a cassette tape drive mechanism of a normal cassette tape recorder,
It goes without saying that it includes components such as a magnetic head and a waveform shaping circuit, and the data signal 7a output from the data track 21 is input into the interface 6 as a waveform-shaped serial digital signal. The audio signal output from 22 becomes audio via a speaker (not shown).

The data track 21 is constructed as shown in Fig. 3, and starts from the beginning in the tape running direction (arrow).
Non-recording section 30, header 31a, video data 3
2, data signals are recorded in the order of header 31b, program data 33, headers 31c, 31d, and 31e.

The unrecorded portion 30 is provided corresponding to a page of text (not shown), and is always recorded at the beginning of each page. Therefore, it is regarded as a data signal of the same page until the next unrecorded section arrives.

The headers 31a to 31 are constructed as shown in FIG.
From the beginning in the tape running direction (arrow), a 20-byte φ signal 40, a 1-byte control signal 41, and a 1-byte page signal 42 are provided to clearly distinguish between other noise and header signals. ,
A 2-byte data length signal 43 and a 2-byte start address signal 44 are recorded in this order.

There are four types of control signals 41: 01 selects when video data 32 follows, 02 selects when program data 33 follows, 04 selects to stop tape running, and 08 selects to start a program. .

The page data 42 records what page of the text the data signal (including the video data 32 and program data 33) is on, and it is sufficient that it is recorded in at least one location per page. By combining this with the non-recording section 30, it becomes possible to locate the beginning of the tape by specifying the page (number of pages).

The data length signal 43 specifies the data length of the next recorded video data 32 or program data 33, or the length of the next program to be executed.
5. Control operations when writing data to the program RAM 3 and when executing the contents of the program RAM 3 can be facilitated.

The start address signal 44 specifies the address for executing the program start (when the control signal 41 is 08).
The program at the specified address in RAM will be executed.

The video data 32 and program data 33 in FIG. 3 are recorded as digital signals with an average rate of 3200 bits/second, with the 4.8 kHz half waveform set to 1 and the 2.4 kHz half waveform set to 0.

The data signal 7a of the external memory 7 described above is converted into a parallel signal of 8 bits by the interface 6 and sent to the data bus 1b.

Next, the operation of the present invention will be explained based on the embodiment of the data track shown in FIG.

First, following the tape running direction indicated by the arrow, the unrecorded section 30 at the right end of the data track 21 is read and input from the interface 6 to the CPU 1 via the data bus 1b, and it is recognized that a new page has been entered. Ru.

Next, 6-byte signals 41 to 44 of the header 31a (following the φ signal 40) are input, but the control signal 41 01 (followed by the video data 32)
is input to the CPU 1, the address bus 1a connects the interface 6 and the video RAM 5,
Subsequent video data 32 is written from the interface 6 to the video RAM 5 via the data bus 1b. At this time, even if data is written at the aforementioned 3200 bits/second, one screen is 6k bytes, so it takes 15 seconds.
80% of the actual tape has no data signal (consisting only of 2400Hz "0"), 17% is video data, and 3% is program data, so it is a portion that takes time to transfer.

Since the data bus 1b is always connected to the block, the contents of the video data 32 can be viewed on the monitor TV 10 via the video controller 8 and RF modulator 9 even while the video data 32 is being written.

When the video data 32 has been written to the video RAM 5, the header 31b is input.
Since the future control signal 41 is 02 (followed by program data 33), address bus 1
a connects the interface 6 and the program RAM 3, and subsequent program data 33 is written to the program RAM 3 via the data bus 1b.

When writing of the program data 33 is completed, the header 31c is input, and the control signal 41 is input.
08 (program start), the contents of the program RAM 3 designated by the data length signal 43 and start address signal 44 are executed.
For example, the image read out from the video RAM 5 by the multiplexer 4 and displayed on the monitor TV 10 via the video controller 8 is modified or calculated. That is, the data track 2 synchronized with the explanatory audio portion of a particular point on a certain graph.
If the header 31c is provided at position 1, it becomes possible to perform operations such as changing the color of the specific point.

The header 31d also has a control signal 41 for starting the program.
The data length signal 43 and start address signal 44 are different from those in the header 31c and are used to execute other programs.

The control signal 41 of the header 31e is 04 (tape running stop), and the tape is stopped here and will not run unless it is started by a key switch (not shown) of the external memory 7.

[Effects] As described above, since the present invention is provided with a header section that selects the data immediately after that, it is possible to easily determine whether the data to be played next is program data or video data, reducing malfunctions. The effects are enormous.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a data reading device for a stereo cassette tape according to the invention, FIG. 2 is an explanatory diagram showing a part of the stereo cassette tape according to the invention, and FIG. The illustrated diagram, FIG. 4, is an explanatory diagram showing the header of FIG. 3. 21...Data track, 22...Audio track, 31a to 31e...Header, 32...Video data, 33...Program data, 41...Control signal.

Claims (1)

[Claims] 1. Consisting of one track that stores audio signals and another track that stores digital data used in an external device, the other track stores video data that is used in the external device. It consists of a video data section, a program data section storing program data used in an external device, and a header section corresponding to each of the video data section and the program data section, and the header section stores the data immediately after it. A stereo cassette tape characterized in that a control signal for selecting either the video data or the program data is stored.