JPH06251500A - Information display device for dealing with audio - Google Patents

Abstract

PURPOSE:To simplify the reproduction by recording and reproducing respective signals of audio control on one side of a cassette tape and picture control on the other side. CONSTITUTION:A cassette tape deck 10 is provided with magnetic heads 27L, 27R reading the signal recorded on the left and right tracks of the cassette tape 15, preamplifiers 28L, 28R, power amplifiers 29L, 29R and speakers 30L, 30R. A switching part 31 is provided between the amplifiers 29 and the speakers 30, and when an input plug is inserted, the outputs of the amplifiers 29 are supplied only to a conversion part 16 and an audio storage part 17. By the conversion part 16, the signal on the left track of the tape 15 is converted to a digital signal, and the signal on the right track is stored in the audio storage part 17. This device is provided with a CPU 18, a ROM 19, a RAM 20 controlling the operation of respective parts in an information display device for dealing with audio and an A/V signal generator 21 outputting a video signal, and a character and a graphic are displayed on a liquid crystal display plate 22. In such a manner, the reproduction of the audio and the video are performed by the cassette tape.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention utilizes a commercially available cassette tape deck to reproduce audio signals and video signals recorded on a cassette tape, and makes characters and figures correspond to the audio on a liquid crystal display or an external device. The present invention relates to a voice-corresponding information display device adapted to be displayed on an attached television.

[0002]

2. Description of the Related Art There are cassette tape decks and video decks as devices for reproducing audio signals and video signals, and these are now widely spread. The cassette tape deck is a device that reads an audio signal recorded on a cassette tape with a magnetic head and reproduces it with a speaker. The VCR is a device that reads an audio signal and a video signal recorded on a video tape with a magnetic head and reproduces them on a television or the like.

[0003]

Although the cassette tape is small, lightweight and inexpensive, it is generally inconvenient that it can only record and reproduce audio signals and cannot handle video signals. is there. On the other hand, a video tape can record a video signal and an audio signal, but it has a drawback that it is larger and more expensive than a cassette tape, and the video deck has a complicated circuit structure and is expensive. There is a point. The present invention has been made in view of this problem, and an object thereof is to provide an audio corresponding information display device capable of reproducing an audio signal and a video signal while having an inexpensive and simple configuration. And

[0004]

In order to achieve the above-mentioned object, a voice-corresponding information display device according to claim 1 comprises:
A signal reading unit for reading a sound signal and a screen control signal from a cassette tape that records a sound signal on one side of a recording track and a screen control signal corresponding to the sound signal on the other side, and a read sound signal. A storage unit that stores the screen control signal, and the stored screen control signal is decoded, an image corresponding to the decoded content is displayed on the image display device, and the audio signal stored in the storage unit is reproduced. And a control unit that operates.

The cassette tape is a commercially available tape, in which an audio signal is recorded on one side track and an image control signal is recorded on the other side track in advance. The recording method of the image control signal is not particularly limited, but the image control signal may be recorded by, for example, the FS modulation method. Although the specific content of the image control signal is not particularly limited, for example, the character / graphic information to be displayed on the image display device and the character / graphic information.
It is conceivable that the information includes command information for instructing the display mode of the graphic information. Further, it may include a first reference signal FS-modulated by either one of the signals 1 and 0 and a second reference signal FS-modulated by the signals 1 and 0 alternately. .

The reading section is, for example, a commercially available cassette tape, and reads out the audio signal recorded on the one side track and the image control signal of the other side track containing the above-mentioned information and the like. The storage unit is, for example, a semiconductor memory and converts the audio signal and the image control signal into, for example, a digital signal and stores the digital signal. The control unit is a unit mainly composed of a CPU, for example, and decodes the image control signal stored in the storage unit and displays an image according to the contents of the decoding on the image display device. Also, the audio signal stored in the storage unit is reproduced.

Here, if the image control signal includes the first reference signal, the command information and the like can be decoded on the basis of the repetition cycle of the first reference signal. Even if the carrier frequency in the modulation fluctuates, each information can be accurately decoded. Also,
If the image control signal includes the second reference signal, it is possible to determine whether or not the cassette tape recording the signal is the original product by decoding the reference signal.

[0008]

The present invention will be described in more detail based on the following examples. FIG. 1 is a diagram showing an external appearance of the device and a usage state of the device for a voice-corresponding information display device 1 according to an embodiment of the present invention. An example is shown in which an English word (HOUSE) and a Chinese character (house) are displayed together with corresponding figures and a model pronunciation is output from a speaker to perform language education.

A liquid crystal display 2, an image illuminance adjusting volume 3, a speaker 4, and a display selecting switch 5 are provided on the front surface of the voice-compatible information display device 1.
, A backlight switch 6, and a power switch 7. Here, the backlight switch 6
Is a push button switch, and when it is turned on, the backlight (EL) of the liquid crystal display 2 is turned on, and it can be used even in a dark place. The display selection switch 5 is a rotary switch, and when it is rotated, characters or figures are displayed on either the liquid crystal display 2 or the television screen.

An input jack 8 for audio signals is provided at the left end of this apparatus, and the input jack 8 is connected via an input plug 9 to an existing cassette tape deck 10.
Is connected to the headphone jack. On the other hand, at the right end of this device, there is an audio jack 11 and a television jack 1.
2 is provided so that the output signal from the audio jack 11 is supplied to the earphone 13 and the output signal from the television jack 12 is supplied to the A / V terminal of the television 14.

FIG. 2 is a circuit block diagram showing a connection relationship among the audio corresponding information display device 1, the cassette tape deck 10 and the television 14. The voice-compatible information display device 1 is
A conversion unit 16 for converting a signal obtained from the left track of the cassette tape 15 into a digital signal, and the cassette tape 1.
5, a voice storage unit 17 for storing a signal obtained from the right track of FIG. 5, a CPU 18 for controlling the operation of each unit of the apparatus, and a CP
RO that stores the program for operating U18
M19, a RAM 20 for temporarily storing the decoded data DISP from the conversion unit 16, an A / V signal generation unit 21 for outputting a video signal in accordance with a command from the CPU 18, and a liquid crystal display plate 22 for displaying characters and figures. , A liquid crystal controller 23 for driving the liquid crystal display plate 22 in accordance with a command from the CPU 18, and the like.

Further, an EL section 24 forming a backlight is provided on the back surface of the liquid crystal display panel 22, and the EL section 24 emits light based on a signal output from the inverter 25. ing. Inverter 2
5 is connected to the power supply unit 26 via the backlight switch 6, and the display selection switch 5, the backlight switch 6, and the speaker 4 are connected to the front surface of the device 1 as shown in FIG. It is provided in.

The cassette tape deck 10 includes magnetic heads 27 _L and 27 _R for reading signals recorded on the left and right tracks of the cassette tape 15, preamplifiers 28 _L and 28 _R for amplifying the output of the magnetic head 27, and a preamplifier 2.
Power amplifiers 29 _L and 29 _R for amplifying the output of 8 and a speaker 30 that speaks based on the output of the power amplifier 29.
It is composed of _L and 30 _R. Also, power amplifier 2
A switching unit 31 is provided between the speaker 9 and the speaker 30. When the input plug 9 (see FIG. 1) is inserted into the switching unit 31, the output of the power amplifier 29 is output only to the conversion unit 16 and the voice storage unit 17. It is being supplied.

FIG. 3 shows the recorded contents of the cassette tape 15. As shown in the figure, an audio signal is recorded on the right track of the cassette tape 15, and a character / graphic signal is recorded on the left track. An audio signal is recorded on the right track as in the normal case, but a carrier signal of 1 and 0 is recorded on the left track as F.
An FS signal obtained by S-modulation (Frequency-Shift) is recorded. FIG. 4 is a diagram showing this FS signal, and shows a case where it is modulated by data 1 (a) and a case where it is modulated by data 0 (b). As is clear from this figure, the pulse widths W ₁ and W ₀ are W ₀
= 2 × W ₁ , and the frequency f ₁ of the FS signal modulated with data ₁ is twice the frequency f ₀ of the FS signal modulated with data 0. The mark X in FIG. 4 is for explaining the operation of the modulator 16 and is not relevant at this time.

The character / graphics signal recorded on the left track is characterized by its recording format, which is shown in FIG. That is, the FS signal is recorded on the left track in the order of "noise prevention signal N" + "8 bit length command signal COM" + "character / graphic signal GR" + "copy protection signal C". The CPU 18 reads the series of FS signals together with the audio signal, stores them in the RAM 20 and the audio storage unit 17, and then reproduces the image and the audio based on the stored contents.

By the way, since the voice reproduction time may be long or short, the time interval of the noise prevention signal N (that is, the voice reproduction time) is irregular (see the hatched portion in FIG. 6). The noise prevention signal N is a signal obtained by continuously modulating a carrier signal with 1 or 0 data,
The CPU 18 demodulates the "copy protection signal C" from the "command signal COM" that follows, using the noise protection signal N as a reference. In this way, the noise prevention signal N is recorded corresponding to the group of character / graphic signals GR, so that even if the frequency of the carrier signal fluctuates for some reason, C
The PU 18 can demodulate the FS signal in response to the frequency fluctuation, that is, it can always recognize the cassette tape signal without error.

The copy protection signal C is, for example, an FS signal modulated by 8-bit length data 10101010, and is used for distinguishing an original cassette tape from a copied product. When the copy protection signal C is copied, a deviation occurs at the boundary between data 1 and data 0 in the process of reading this copy protection signal C and copying it again to the cassette tape (see D in FIG. 7).
Decodes this deviation and detects a copy product.

The command signal COM is a signal for controlling the display contents of the liquid crystal display panel 22 and the television 14.
The command signal COM consists of 8-bit data, and an example of the command contents is shown in FIG. CPU1
Reference numeral 8 decodes the command signal, and controls the liquid crystal controller 23 and the A / V signal generator 21 based on the decoded content. Although only eight types of commands are shown in FIG. 8,
It is possible to arbitrarily add instructions within the range of 256 types.

The character / graphic signal GR has a different data amount depending on the screen information to be displayed on the liquid crystal screen, but in the case of expressing one still screen, an F of 160 × 64 bit length is used.
It becomes an S signal. In this embodiment, both characters and figures displayed on the screen are formed in a dot pattern of 160 dots × 64 dots. Further, the time information signal T may be added to the character / graphic signal GR, which is utilized in a karaoke function or the like which will be described later.

The character / graphic signal GR is a command signal CO.
It is processed according to the contents of M. For example, the command signal COM
Is F0 (hexadecimal number display), the character / graphic signal (1024 dots) following this command signal is displayed on the liquid crystal display panel 2.
2 is displayed line by line from top to bottom. When the command signal COM is F2, the CPU 18 causes horizontal 160 dots × vertical 16
After reading the dot / character signals (one line of the screen), the screen up to that point is scrolled up one line and a new line is displayed at the bottom. Command signal COM is F4
In this case, after the CPU 18 reads the character / graphic signals for 160 × 16 dots, the screen up to that point is scrolled down one line and a new line is displayed on the top line.
When the command signal COM is F6, the CPU 18 moves horizontally 16
After reading a character / graphics signal (for one column of the screen) for dots × 64 dots vertically, the screen so far is scrolled to the left by one column, and a new column is displayed on the rightmost line. When the command signal COM is F8, after the CPU 18 reads the character / graphic signals for 16 × 64 dots, the screen until then is scrolled to the right by one column and a new column is displayed on the leftmost line. . When the command signal COM is FA, the CPU
After 18 reads a character / graphic signal (for one screen) for 1024 dots, the screen blinks.

Next, the case where the command signal COM is FE and this command signal means the karaoke function will be described with reference to FIG. For example, "Ye
For example, a case is displayed in which the characters "standy oh my trouble ..." are displayed and the display of each character is reversed in accordance with the voice. In this case, the character / graphic signal GR including the above lyrics is read from the cassette tape for one screen (1024 bits) and is first displayed on the screen. Since the data as shown in FIG. 9 is recorded at the next recording position of the cassette tape, the CPU 18 operates by reading this data and 0.3 seconds after the second character (Y), the second character (e ) Invert the display. That is, in FIG. 9, ... Is a character number of a character already displayed, and 0.3, 0.3 ... Are time information signals T.

FIG. 10 is a flow chart for explaining the operation of this device. Hereinafter, the operation of the voice-compatible information display device will be described with reference to FIG. When the power of this device is turned on, each part of the device is first initialized (ST
1). In the following description, it is assumed that the selection switch 5 is connected to the liquid crystal controller 23 side. When the initialization process ends, the CPU 18 takes in the output data from the conversion unit 16 and determines whether or not the noise prevention signal N is input (ST2).

If the cassette deck is in the PLAY state,
Since the noise prevention signal N is continuously input, the CPU 1
Based on this noise prevention signal N, 8 recognizes the pulse width W ₀ of the FS signal indicating data ₀ and the pulse width W _{1 of the} FS signal indicating data 1 (ST3). More specifically, the conversion unit 16 receives the noise prevention signal N and outputs digital data at regular time intervals (see the cross mark in FIG. 4). In the case of this data string ((a) in FIG. 4), 11110000
11110000 ...) is used to determine the pulse period W ₁ .
Since the pulse width W ₀ and the pulse width W ₁ have the above-mentioned predetermined relationship, the other pulse width W ₀ can be automatically determined by recognizing the pulse width W ₁ . Then, the determined pulse widths W ₀ and W ₁ become reference values for determining whether the character / graphic data input from the conversion unit 16 is 1 or 0.

Subsequently, the CPU 18 converts the digital data string output from the conversion unit 16 into a pulse width W which is a reference value.
Decoding based on ₀ and W ₁ , a series of decoding data DISP
(Specifically, COM + GR + (T) + C) RAM20
Remember. 11A to 11C show the relationship between the FS signal supplied to the conversion unit 16, the digital data string output from the conversion unit 16, and the decrypted data DISP stored in the RAM 20. It was done. In parallel with the above operation, the audio storage unit 17 converts the audio signal output from the main amplifier 29 _R into digital data and stores it. The voice storage unit 17 is a RAM type storage element and has a storage capacity capable of storing a voice signal for about 7 to 10 seconds.

The CPU 18 uses a series of decrypted data DISP.
The above process is repeated until is stored in the RAM 20 (ST4). Then, when the storage of the series of decoded data is completed, the process proceeds to the next process. That is, the CPU 18
Is a series of decrypted data DISP stored in the RAM 20.
Referring to, decoding of the command signal COM and the liquid crystal display panel 22
Then, the contents to be displayed next are examined, the time information signal T is analyzed, and the copy protection signal C is analyzed (ST5). Since the validity of the decrypted data stored in the RAM 20 can be determined by the analysis processing of the copy protection signal C (ST
6) If it is determined that the copied product is mounted in the audio cassette 10, the screen operation is stopped and the process is finished (ST7).

On the other hand, when the decrypted data DISP stored in the RAM 20 is determined to be valid, the CPU 18 controls the liquid crystal controller 23 so that the liquid crystal display plate 23 displays an appropriate screen. To do. Since the display content of the liquid crystal display panel 23 is instructed by the command signal COM, the screen scrolling or screen blinking operation is performed according to the operation of the liquid crystal controller 23. Then, it is determined whether or not the processing should be ended, and if necessary, S
The process returns to T2 (ST9).

The processes of ST2 to ST9 described above can be summarized as follows. The magnetic head 27 reads a series of FS signals and audio signals recorded on the cassette tape 15 and adds them to the conversion unit 16 and the audio storage unit 17. The conversion unit 16 converts this into a digital data string (see FIG. 11).
(See (b)) and output to the CPU 18. CP
U18 decodes this digital data string, converts it into decoded data DISP ((c) in FIG. 11), and stores it in RAM20. In addition, in parallel with this processing, the voice storage unit 17
Stores audio signals.

After that, the liquid crystal controller 23 makes the CPU 1
The liquid crystal display panel 22 is driven based on the command from the speaker 8, and at the same time, the audio signal of the audio storage unit 17 is output to the speaker 4. Next, during operation of this device, the PAU of the cassette deck
The case where the SE button is pressed will be described. PAUS
When the E button is pressed, the noise prevention signal N is not applied to the conversion unit 16. Therefore, the processing is from ST2 to ST1.
After shifting to 0, the CPU 18 keeps the display screen of the liquid crystal display panel 22 in the previous state, and repeatedly outputs the audio signal already stored in the audio storage unit 17 (ST.
3). Since this process continues until the PAUSE button is released, it is particularly effective when this device is used for language learning.

[0029]

As described above, the audio-corresponding information display device according to the present invention is characteristically provided with the signal reading section, the storage section and the control section, and the audio signal recorded on the cassette tape It is possible to easily reproduce the video signal. In the present invention, since a commercially available cassette tape is sufficient, when a FS signal in the audio band is used as the video signal, the commercially available cassette tape deck can be used as a substitute for the signal reading section, and the entire apparatus can be used. It can be further simplified.

The image control signal recorded on the cassette tape can include character / graphic information and command information for instructing the display mode of the character / graphic information. Can be scrolled as appropriate. Since it is possible to add the first and second reference signals to the image control signal, it is possible to reliably decode the command information and detect the cassette tape which is a copy product. Will also be possible.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a usage mode of a voice-corresponding information display device according to an embodiment of the present invention.

FIG. 2 is a diagram showing an internal block diagram of the audio-corresponding information display device shown in FIG.

FIG. 3 is a schematic diagram showing a relationship between a voice signal and a character / graphic signal recorded on a cassette tape.

FIG. 4 is a diagram showing a waveform of an FS signal.

FIG. 5 is a detailed diagram showing signal contents recorded on a cassette tape.

FIG. 6 is a detailed diagram showing the contents of signals recorded on a cassette tape.

FIG. 7 illustrates a copy protection signal.

FIG. 8 illustrates an example of a command signal.

FIG. 9 is a diagram illustrating a karaoke function.

10 is a flowchart for explaining the operation content of the audio-corresponding information display device shown in FIG.

FIG. 11 is a diagram showing a relationship among an FS signal, a digital data string, and decoded data.

[Explanation of symbols]

 10 cassette tape deck (signal reading unit) 15 cassette tape 16 signal conversion unit 17 audio storage unit 18 CPU 19 ROM 20 RAM (storage unit) 21 AV signal generation unit 23 liquid crystal controller

Claims (6)

[Claims] 1. An audio signal is provided on one side of a recording track,
On the other side, a signal reading unit that reads the audio signal and the screen control signal from the cassette tape that records the screen control signal corresponding to the audio signal, and a storage unit that stores the read audio signal and the screen control signal, And a control unit for decoding the stored screen control signal, displaying an image according to the content of the decoding on the image display device, and reproducing the audio signal stored in the storage unit. Voice-enabled information display device. 2. The audio-compatible information display device according to claim 1, wherein the signal reading section is a commercially available cassette tape deck. 3. The audio-corresponding information display device according to claim 1, wherein the control unit causes a liquid crystal display device or a television device to display an image. 4. The image control signal includes character / graphic information to be displayed on the image display device, and command information for instructing a display mode of the character / graphic information. The audio-compatible information display device according to item 1. 5. The audio corresponding information display device according to claim 1, wherein the cassette tape records an image control signal by an FS modulation method. 6. The image control signal includes a first reference signal FS-modulated with either one of 1 and 0, and 1
6. The audio-corresponding information display device according to claim 5, further comprising: a second reference signal that is alternately FS-modulated with the signals 0 and 0.