JPH11331767A - Eeprom data interactive modifying method for video cassette tape recorder thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To speed up after-sale service and to lower service cost for displaying on-screen data on a television screen by using a remote control and a television and modifying a set of EEPROM data to be interactive. SOLUTION: An on-screen generation part 30 inputs on-screen data(OSD DATA), superposes an OSD signal on a composite video signal, and outputs the resulting signal. When a service mode is selected in response to 1st remote control input, a service menu screen is displayed on the television screen. When an EEPROM data modification mode is selected in response to 2nd remote control input, a data modification menu screen is displayed. When a data modification item is selected in response to 3rd remote control input, the characteristic value selection screen of the selected item is displayed. When a specific characteristic value is selected in response to 4th remote control input, data in an EEPROM 80 are rewritten with the selected characteristic value. A control part 90 controls them in accordance with an internal program.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a service mode of a video cassette tape recorder, and more particularly, to an EEPROM corresponding to a screen on a television screen by a worker using a remote controller at the time of a test or repair.
The present invention relates to a method and apparatus for interactively changing EEPROM data of a video cassette tape recorder capable of interactively changing the data of the EEPROM.

[0002]

2. Description of the Related Art Video cassette tape recorders are used to receive TV broadcasts, for example, NTSC, PAL, SCE.
It is designed and manufactured according to specifications conforming to the CAM system. Therefore, manufacturers of video cassette tape recorders have adopted a method of improving production efficiency through unification and standardization of parts in order to produce various products conforming to various broadcast systems on the same production line.

Due to the technical tendency described above, the video cassette tape recorder adopts an integrated circuit of circuit components and adopts a microcomputer control system, so that data transfer between each circuit block and the microcomputer is performed in a serial transfer system. Has been adopted. By adopting such a serial transfer method, it is easy to change the circuit characteristics of each circuit block by various options. The option specifications of each circuit block are standardized in a table, and the option data that meets the specification of the set is stored in the EEPROM by referring to the table standardized in the production and assembly process of the set.
It is set to.

[0004] US Pat.
No. 506,892 describes LANC (Local Application Con
A technology for recreating data of a video cassette tape recorder through a trol bus system) is disclosed.

[0005]

However, as described above, the conventional EEPROM data can be changed only by connecting a set with a specific device such as a computer. EEPROM
Because of the inability to change this data, there was a problem that work was restricted in the development room, the production line test process, and the after-sales service site.

[0006] In particular, in the after-sales service, when a home visit service is performed, a failure is checked at the site and the circuit coefficient is adjusted, so that the problem cannot be solved and the set must be brought to the after-sales service center. Was. Therefore, there is a problem that not only the speed of the after service is reduced but also the cost of the after service is increased. In addition, since special equipment such as a computer has to be operated, a skilled person using the equipment is required.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a video cassette capable of interactively changing a set of EEPROM data using a remote controller and a television. An object of the present invention is to provide a method of interactively changing EEPROM data of a tape recorder.

[0008]

According to the present invention, there is provided a method for displaying a service menu screen of a service mode on a television screen when a service mode is selected in response to a first remote control input. Process and
Displaying a data change menu screen on the television screen when an EEPROM data change mode on the service menu screen is selected in response to a second remote control input; and setting the data change mode in response to a third remote control input. When an item on the screen is selected, displaying a characteristic value selection screen of the selected item on the television screen, and selecting a predetermined characteristic value on the characteristic value selection screen in response to a fourth remote control input EEPRO with selected characteristic value
The method further comprises the step of changing the data of M.

The apparatus of the present invention further comprises a video processing unit for processing a video signal according to recording and reproduction characteristics, and an EEPR for storing characteristic values of the recording and reproduction characteristics of the video processing unit.
OM, input means for inputting a remote control signal, on-screen generating means for inputting on-screen data and outputting an on-screen screen signal to a television,
When a service mode is selected in response to the first remote control input input through the input means, a service menu screen of the service mode is displayed on the television screen through the on-screen generating means, and in response to the second remote control input. When the EEPROM data change mode on the service menu screen is selected, the data change menu screen is displayed on the television screen. When an item on the data change mode screen is selected in response to a third remote control input, the data change menu screen is selected. Displaying a characteristic value selection screen of the selected item on the television screen, and selecting a predetermined characteristic value on the characteristic value selection screen in response to a fourth remote control input, changing the EEPROM data with the selected characteristic value. It is characterized by comprising a part.

The above objects and other features and advantages of the present invention will become apparent from the following description of some preferred embodiments of the present invention to which reference is now made.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an EEP of a video cassette recorder according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.
The configuration and operation of the ROM data interactive change method and apparatus will be described. FIG. 1 shows a block configuration of a video cassette tape recorder according to the present invention. As shown in FIG. 1, the video cassette tape recorder includes a tuner unit 10, a switching unit 20, an on-screen generation unit 30, a video processing unit 40, a deck unit 50, an input unit 60, a display unit 70, an EEP.
It includes a ROM 80 and a control unit 90.

The tuner unit 10 tunes a broadcast signal of a selected channel among television broadcast signals received through an antenna, demodulates the tuned signal, and outputs a video signal and an audio signal. Also,
The tuner unit 10 modulates the input video signal and audio signal into a broadcast signal of a specific channel and outputs it as a high-frequency signal. This high frequency signal is provided at the television set's antenna input.

The switching section 20 switches input and output of a video signal and an audio signal according to an operation mode. The line output of the switching unit 20 is line-input to the television set.

The on-screen generator 30 receives the provided on-screen data (OSD DATA) and
The signal is converted into a GB signal, the RGB signal is converted again into a video signal, and the converted signal is superimposed on a composite video signal and output.

The video processing section 40 separates a signal reproduced from a video cassette tape through a video reproducing head into a luminance signal and a chrominance signal and processes the signals.

The reproduced FM signal is equalized, phase-clamped, and then automatically gain-adjusted. The modulated signal whose gain has been adjusted is demodulated through a limit process. The demodulated luminance signal is subjected to low-pass filtering, reduced in luminance noise, and then subjected to de-emphasis processing. The signal subjected to the de-emphasis processing is subjected to noise reduction processing, and the screen is controlled to adjust the sharpness. On the other hand, the reproduced F
The M-modulated signal is subjected to automatic color control through a low-pass filter. The color controlled signal is upconverted at 627 kHz at 4.43 MHz. The converted color signal is band-filtered to remove crosstalk components, and then amplified and subjected to noise reduction processing. The screen-controlled luminance signal and the noise-reduced color signal are superimposed through a mixer, and the superimposed video signal is output to the on-screen generator 30 as a composite video signal through a video amplification process.

The video signal input to the video processing section 40 is video-amplified, and 4.43 MH of the amplified signal is output.
Only signals in the z band are band-filtered. This filtered signal is separated into color signals through a comb filter. The separated color signal is subjected to automatic color control, and the color-controlled signal is down-converted to a 627 kHz band. The down-converted color signal is low-pass filtered. On the other hand, the amplified video signal is 減 衰 -attenuated, and the attenuated signal is low-pass filtered and subjected to luminance noise reduction processing. The noise-reduced signal is FM-modulated after being emphasized to emphasize a high-frequency portion. The FM modulation signal is subjected to a recording equalization process. The low-pass filtered color signal and the equalized FM modulation signal are subjected to automatic gain processing and provided to a recording head.

The video processing section 40 processes the chrominance signal and the luminance signal through complicated processing steps. As described above, various processing processes require adjustment of circuit characteristic values in order to perform setting through appropriate circuit characteristics in each process. In particular, it is necessary to adjust circuit coefficients in a luminance noise reduction process during recording and reproduction, a screen control process for sharpness of a screen during reproduction, and an emphasis process for high-frequency emphasis during recording. Such adjustment of the circuit coefficient is performed by decoding serial data provided from the outside and adjusting the circuit coefficient value in the corresponding process.

The deck unit 50 includes a capstan motor, a drum motor, a reel motor, a loading motor, and the like, and reproduces a video signal from a video cassette tape and drives a loading mechanism to record the video signal on the tape.

The input section 60 receives a light signal emitted by a key input of the remote controller 62 to generate a key signal, and generates a key signal in response to a keypad on the front panel of the set.

The display unit 70 is constituted by a fluorescent display tube and displays time and each operation mode state of the system. EEPROM
80 stores system characteristic data, for example, data of a broadcast system, a head system, recording and reproduction speed, and control characteristic data of a recording or reproduction video signal.

The control characteristic data of the video signal includes a pre-emphasis gain of the recording signal, a luminance signal-to-noise ratio of the recording and reproduction signals, a screen definition of the reproduction signal, an equalization characteristic, and a recording level. Pre-emphasis gain adjustment data is standard,
The luminance signal-to-noise ratio adjustment data is composed of the standard, medium, and enhancement steps, and the reproduction signal screen definition adjustment data is -7.
It consists of 15 steps from dB to +7 dB.

The control unit 90 is constituted by a microcomputer. The microcomputer executes the operation program to control the above-described units and executes the service mode program. The control unit 90 is connected to the video processing unit 40 and the EEPROM 80 via a serial data bus.
Accordingly, the video processing unit 40 decodes the EEPROM data provided from the control unit 90 and adjusts the circuit coefficients in each signal processing process according to the given control characteristics.

FIGS. 2 and 3 are flowcharts illustrating a method of interactively changing EEPROM data according to a preferred embodiment of the present invention. The operator executes the error check mode in a state where the video cassette tape recorder and the television set are line-connected.

Referring to FIG. 2, the service mode program of the present invention is opened only by an encryption key combination which is open only to a specific worker such as a set developer, a test worker or an after service worker. This can prevent consumers from approaching the service mode. That is, the operator first presses a “menu key” on the remote controller 62 and then continuously presses an encryption key such as a numeric key 4-8-4. In the set, a key signal of the remote controller 62 is input through the input unit 60 and provided to the control unit 90.
The control unit 90 determines that the service mode has been selected when the input key combination is a predetermined key combination (S200), and provides the on-screen data to the on-screen generation unit 30. Accordingly, the on-screen generator 30 receives the on-screen data and generates a video signal. The generated video signal is supplied to the switching unit 20.
Is transmitted to the television set through the on-screen display shown in FIG. 4 (S202). Service mode (SERVICE MODE) is roughly divided
Repair mode (REPAIR MODE; "1"), timer check mode (TIMER CHECK MOD)
E; “2”), EEPROM data change mode (EEP
ROM DATA CHANGE MODE; "3")
and so on.

Next, when the operator presses the numeric key 3 through the remote control 62 to select the EEPROM data change mode as displayed on the screen, a key signal is transmitted to the control unit 90 in the same manner as described above. You. The controller 90 determines that the EEPROM data change mode has been selected (S204), and provides the on-screen data to the on-screen generator 30. Accordingly, the on-screen generator 30 receives the on-screen data and generates a video signal. The generated video signal is transmitted to the television set through the switching unit 20, and the on-screen screen shown in FIG. 5 is displayed (S20).
6). In the EEPROM data change mode, the pre-emphasis data change (PRE-EMPHASIS DATA) is performed.
CHANGE; “2”), luminance signal to noise ratio data change (YNR DATA CHANGE; “2”), screen control data change (PICTURE CONTROL D)
ATA CHANGE; "3").

First, when the numeric key 1 is pressed through the remote controller 62 to select a pre-emphasis data change item, the control unit 90 determines that the pre-emphasis data change item has been selected by the same operation as described above. (S208), providing the on-screen data to the on-screen generating unit 30. Accordingly, the on-screen generator 30 receives the on-screen data and generates a video signal. The generated video signal is transmitted to the television set through the switching unit 20, and the on-screen screen shown in FIG. 6 is displayed (S21).
0).

The operator adjusts the emphasis gain adjustment to standard (STANDARD; "1"), medium (MEDIUM; "2"), and emphasis (STRON) while viewing the screen of FIG.
G; "3"), when a corresponding numeric key is pressed to select one, the control unit 90 determines that pre-emphasis data is selected by the same operation as described above (S212). ), E
The data in the EPROM 80 is changed (S214). The control unit 90 issues a return instruction (RETUR) after changing the data.
N; “0”) is checked (S213),
If there is no return command, step 210 is performed, and if there is a return command, the process returns to step 206.

Referring to FIG. 3, when the user presses numeric key 2 through remote controller 62 to select a luminance signal-to-noise ratio data change item in step 206, the control unit 90 performs the same operation as described above. It is determined that the noise-to-noise ratio data change item has been selected (S21).
6), the on-screen data is output to the on-screen generator 3
0 is provided. Accordingly, the on-screen generator 30 receives the on-screen data and generates a video signal. The generated video signal is transmitted to the television set through the switching unit 20, and the on-screen screen shown in FIG. 7 is displayed (S218).

When the operator presses the corresponding numeric key to select one of OFF, standard, medium and emphasis adjustment of the luminance signal-to-noise ratio while viewing the screen of FIG. By the same operation as that described above, the control unit 90 determines that the luminance signal-to-noise ratio data has been selected (S220), and changes the data in the EEPROM 80 with the selected data (S222).

After the data change, the control unit 90 checks whether there is a return command (S223), and if there is no return command, executes step S218, and if there is a return command, returns to step S206.

When the numeric key 3 is pressed through the remote control 62 to select a screen control data change item in step S206, the control unit 90 performs the same operation as described above.
Then, it is determined that the screen control data item has been selected (S224), and the on-screen data is provided to the on-screen generator 30. Accordingly, the on-screen generator 30 receives the on-screen data and generates a video signal. The generated video signal is supplied to the switching unit 20.
And transmitted to the television set, and the on-screen screen shown in FIG. 8 is displayed (S226).

The operator adjusts the screen control (PIC CTL) while looking at the screen shown in FIG. 8, and presses the left / right key to select a certain step between -7 dB and +7 dB, and moves the cursor to a desired step. Let it. Then, when the OK key is pressed with the cursor positioned at a desired stage,
The control unit 90 determines that the screen control data has been selected by the same operation as described above (S22).
8) The data in the EEPROM 80 is changed with the selected data (S230). The control unit 90 checks whether there is a return instruction after the data change (S23).
1) If there is no return command, step S226 is performed, and if there is a return command, the process returns to step S206. In step S206, when the numeric key 0 is pressed through the remote controller 62, the control unit 90 performs step S202 to return to the menu screen.

[0034]

As described above, according to the present invention, as long as there is only a television and a remote control, the EEPROM data of the video cassette tape recorder can be provided to the development room, the production assembly test process, and the special equipment at the after-sales service site. You can easily change it without it. In addition, since the data change operation is automatically changed when a desired item is selected by the remote controller in accordance with the instruction shown on the screen, even an unskilled person can perform the data change operation interactively. .

In particular, when changing the control characteristic value of the set by visiting each home during the after-sales service, the operator can easily open the service mode using the remote controller and change the EEPROM data. All service work can be completed on site without having to move the service to the after-sales service center. This can reduce the cost of after-sales service and allow for quick after-sales service.

The present invention has been described in detail with reference to the embodiments. However, the present invention is not limited to the embodiments, and any person having ordinary knowledge in the technical field to which the present invention belongs may depart from the spirit and spirit of the present invention. Rather, the invention could be modified or changed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a video cassette tape recorder according to the present invention.

FIG. 2 is a flowchart illustrating a method of interactively changing EEPROM data according to a preferred embodiment of the present invention;

FIG. 3 is a diagram showing a state of an interactive change display screen of EEPROM data.

FIG. 4 is a diagram showing a state of an interactive change display screen of EEPROM data.

FIG. 5 is a diagram showing a state of an interactive change display screen of EEPROM data.

FIG. 6 is a diagram showing a state of an interactive change display screen of EEPROM data.

FIG. 7 is a view showing a state of an interactive change display screen of EEPROM data.

FIG. 8 is a diagram showing a state of an interactive change display screen of EEPROM data.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Tuner part 20 Switching part 30 On-screen generation part 40 Video processing part 50 Deck part 60 Input part 62 Remote control 70 Display part 80 EEPROM 90 Control part

Claims (16)

[Claims] A step of displaying a service menu screen of a service mode on a television screen when a service mode is selected in response to a first remote control input; and a step of displaying a service menu screen in response to a second remote control input on the service menu screen. A step of displaying a data change menu screen on the television screen when the EEPROM data change mode is selected; and selecting an item on the data change mode screen in response to a third remote control input. Displaying a characteristic value selection screen on a television screen, and changing EEPROM data with the selected characteristic value when a predetermined characteristic value is selected on the characteristic value selection screen in response to a fourth remote control input. A method for interactively changing EEPROM data of a video cassette tape recorder, the method further comprising: 2. The method according to claim 1, wherein the selection of the service mode is made by a combination of at least three or more remote control key inputs. 3. The method according to claim 2, wherein the combination of at least three or more remote control key inputs is disclosed only to a maker or a service worker. 4. The video cassette tape recorder according to claim 1, wherein the EEPROM data is a control characteristic of a recording or reproduction video signal.
M data interactive change method. 5. The control characteristic of the video signal is at least one of a pre-emphasis gain of a recording signal, a luminance signal-to-noise ratio of a recording and reproduction signal, and a screen definition of the reproduction signal. Item 5. The method for interactively changing EEPROM data of a video cassette tape recorder according to Item 4. 6. The method according to claim 5, wherein the pre-emphasis gain is selected from one of a standard, a medium, and an emphasis. 7. The video cassette tape recorder EE according to claim 5, wherein the luminance signal to noise ratio is selected from one of a standard, a medium, and an emphasis.
PROM data interactive change method. 8. The method according to claim 5, wherein the screen sharpness of the reproduced signal is selected from one of -7 dB and +7 dB. 9. A video processing unit for processing a video signal according to recording and reproduction characteristics, an EEPROM for storing characteristic values of recording and reproduction characteristics of the video processing unit, input means for inputting a remote control signal, On-screen generating means for inputting screen data and outputting an on-screen screen signal to a television; and when the service mode is selected in response to a first remote control input input through the input means, the on-screen generating means A service menu screen of the service mode is displayed on the television screen through the display screen. When the EEPROM data change mode on the service menu screen is selected in response to the second remote control input, the data change menu screen is displayed on the television screen. 3 On the data change mode screen in response to remote control input When an eye is selected, a characteristic value selection screen of the selected item is displayed on the television screen, and when a predetermined characteristic value is selected on the characteristic value selection screen in response to a fourth remote control input, the selected characteristic value is selected. A video cassette tape recorder comprising a control unit for changing the data of the EEPROM. 10. The video cassette tape recorder according to claim 9, wherein the service mode is selected by a combination of at least three or more remote control key inputs. 11. The video cassette tape recorder according to claim 10, wherein the combination of at least three or more remote control key inputs is open to only a maker or a service worker. 12. The video cassette tape recorder according to claim 9, wherein said EEPROM data is a control characteristic of a recording or reproduction video signal. 13. The control characteristic of the video signal is at least one of a pre-emphasis gain of a recording signal, a luminance signal-to-noise ratio of a recording and reproduction signal, and a screen definition of a reproduction signal. Item 13. A video cassette tape recorder according to Item 12. 14. The video cassette tape recorder according to claim 13, wherein the pre-emphasis gain is selected from one of a standard, a medium, and an emphasis. 15. The video cassette tape recorder according to claim 13, wherein the luminance signal to noise ratio is selected from one of a standard, a medium, and an emphasis. 16. The reproduction signal has a screen definition of -7 dB.
14. The video cassette tape recorder according to claim 13, wherein the video cassette tape recorder is selected to a certain one of the levels from +7 dB to +7 dB.