JP2000244942A - Video deck and method for adjusting image quality of video deck - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a video deck by which the image quality of a reproduced video image can be corrected matching the preference of a user through simple adjustment by means of a remote commander in spite of a simple configuration and to obtain an image quality adjustment method of the video deck. SOLUTION: A user of the video deck uses a remote commander 80 to change an image quality adjustment parameter table written in an EEPROM 60, thereby setting a desired setting value to each parameter. Thus, the image quality of a reproduced video image can easily be adjusted with a simple adjustment method matching the preference of the user.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video deck and a video deck image quality adjustment method, and more particularly, to a video deck and a video deck image quality adjustment method capable of variably operating parameters for adjusting reproduced video.

[0002]

2. Description of the Related Art Conventionally, as this kind of video deck, one disclosed in Japanese Utility Model Laid-Open No. 58-48585 is known. In the publication, a reproduction luminance signal component obtained from a magnetic tape is mixed with a reproduction chroma signal component from the magnetic tape through image quality adjustment means capable of variably adjusting the frequency characteristic from outside the VCR, and The image quality is adjusted by outputting as a video decoded signal. The adjustment of the image quality of the reproduced video by the video deck is mainly performed by picture control, and emphasizes or weakens the outline in the video. In addition, D which is usually used for adjusting image quality
As parameters included in an OC (dropout control) circuit and a noise reduction circuit, parameters assumed at the time of design are written in a ROM or the like of a circuit board.

The above-mentioned conventional video deck has the following problems. That is, there is a problem that a predetermined circuit for changing the frequency characteristic and a volume for adjustment are required, and the configuration of the device becomes large. In addition, there is a problem that the user has to perform an operation of adjusting the volume and the like, which complicates the operation. When changing the parameters of the DOC circuit and noise reduction circuit, use the ROM on the circuit board.
There is a problem that the written parameters must be removed and the written parameters must be rewritten. The present invention
In consideration of the above-mentioned problems, the video deck and the video quality adjustment of the video deck which have a simple configuration and can correct the image quality of the reproduced video according to the user's preference by a simple adjustment operation using a remote control. The purpose is to provide a method.

[0003]

According to a first aspect of the present invention, there is provided a signal processing IC for performing predetermined signal processing on a recording signal read by a video head to generate a reproduced video signal. A parameter table having a plurality of parameters for adjusting the image quality of a reproduced video based on a reproduced video signal generated by the signal processing IC, a microcomputer for transferring setting contents of the parameter table to the signal processing IC at a predetermined timing, The signal processing IC is connected to the microcomputer and the parameter table, and includes an IIC bus for transferring predetermined data, and parameter operating means for changing the setting contents of the parameter table via the IIC bus. is there.

[0004] In the invention according to claim 1 configured as described above, the signal processing IC inputs a recording signal read by a video head, and executes predetermined signal processing on the input recording signal. Then, a reproduced video signal for forming a reproduced video is generated. Further, the microcomputer performs the above signal processing I
A parameter table having a plurality of parameters for adjusting the image quality of the reproduced video based on the reproduced video signal generated by C is provided, and the setting contents of the parameter table are transferred to the signal processing IC at a predetermined timing. These signal processing IC, microcomputer and parameter table are
They are connected by an IC bus, and transfer predetermined data via the IIC bus. Here, the parameter operation means is connected to the IIC bus, and changes the setting contents of the parameter table by a predetermined operation. When this change operation is performed, the microcomputer transfers this parameter table to the signal processing IC, and the signal processing IC corrects a predetermined signal to adjust the image quality of the reproduced video. That is, it is possible to change the parameters for adjusting the image quality stored in advance as a parameter table while watching the reproduced image, and to make the reproduced image suitable for the user's preference.

The operation of changing the parameter table by the predetermined operation of the parameter operation means described above may be performed from an operation panel provided on the video deck. However, various operations of the video deck are often performed by a remote controller. It is preferable that the parameter for adjusting the image quality can be changed while watching the reproduced video. Therefore, according to a second aspect of the present invention, in the video deck according to the first aspect, the parameter operation unit displays the setting content of the parameter table on a screen that displays an image based on a reproduced video signal by an OSD function. The configuration is such that the setting contents of each parameter in the parameter table are changed by a remote controller that transfers predetermined operation contents. In the invention according to claim 2 configured as described above, when the user of the present video deck executes an operation of changing the parameters of the parameter table, first, the present video deck is connected by the parameter operation means, and playback is performed. OS that displays characters, etc., on the display that displays the video to be played on the playback video
The setting contents of the parameter table are displayed on a screen for displaying a video based on the reproduced video signal by a D (on-screen display) function. Then, a predetermined operation is performed on the remote controller, and the content of the operation is transferred to the video deck. The video deck changes the setting contents of each parameter in the parameter table when the operation contents are input.

[0006] Generally, various parameters are stored in the above-mentioned parameters. Therefore, the user of the video deck identifies and corrects the corresponding parameter while viewing the reproduced video. Here, when there are a plurality of parameters that need to be corrected, it is troublesome because the parameters must be corrected while specifying each one.
On the other hand, when the reproduced video has poor image quality for some reason, it is preferable that the user recognize this situation and correct a plurality of parameters at once according to the situation. Therefore,
According to a third aspect of the present invention, in the video deck according to any one of the first and second aspects, the microcomputer includes a plurality of parameter tables in which a plurality of parameters for adjusting a predetermined image quality are defined, The parameter operation means is configured to select one parameter table from the parameter table.

In the invention according to claim 3 configured as described above, the microcomputer includes a plurality of parameter tables in which a plurality of parameters for correcting image quality are defined. A parameter changing operation is executed by selecting one parameter table, that is, each situation for adjusting image quality is assigned to each of the plurality of parameter tables. Then, the user can adjust a plurality of parameters by selecting a parameter table according to a corresponding situation.

[0008] As described above, the method of correcting the setting contents of the parameter table having the parameters for adjusting the image quality of the reproduced video from the remote controller for executing each operation of the VCR need not always be limited to a substantial device. However, it can be easily understood that it also functions as the method. For this reason, the invention according to claim 4 is a video deck image quality adjusting method for correcting the setting contents of a parameter table having parameters for adjusting the image quality of a reproduced video from a remote controller that executes each operation of the video deck. hand,

A parameter operation step of changing the setting contents of the parameter table provided in the microcomputer, and when the parameter table is changed in the parameter operation step, the setting contents of the parameter table are connected via the IIC bus. The configuration includes a parameter transfer step of transferring the signal to the signal processing IC, and an adjustment step of adjusting a video signal to be reproduced based on the setting contents of the parameter table transferred in the parameter transfer step. In other words, there is no difference in that the present invention is not necessarily limited to a substantial device and is also effective as a method.

[0010]

As described above, the present invention provides a video deck having a simple configuration and capable of correcting the image quality of a reproduced image according to the user's preference by a simple adjustment operation using a remote controller. can do. According to the second aspect of the present invention, it is possible to perform a change operation while viewing the contents of the parameter table displayed on the display by the remote controller provided in the VCR. Further, according to the third aspect of the present invention, it is not necessary to correct a plurality of parameters for correcting the image quality, and it is only necessary to select one parameter table according to the state of the image quality. Becomes possible. Furthermore, according to the invention according to claim 4, a video deck image quality adjusting method which has a simple configuration and can correct the image quality of a reproduced video according to a user's preference by a simple adjustment operation using a remote controller. Can be provided.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a block diagram of a video deck according to an embodiment of the present invention, and FIG.
2 shows a block diagram of a signal processing IC included in the video deck. In the figure, a video signal reading unit 10
Is provided with a rotating head 11 and a video head 12 disposed on the rotating head 11, the rotation of which is controlled by the microcomputer 20, the video playback signal inserted from the video deck and recorded from the loaded video tape. To get. The video reproduction signal is supplied to a signal processing IC 30. The signal processing IC 30 reads and reproduces the video reproduction signal by the video head 12 and amplifies and high-frequency-compensates the reproduced video signal by the head amplifier 31. The high-pass filter 32 controls only the FM signal. And the original luminance signal is demodulated by the FM demodulation circuit 33. In the low-pass filter 34,
Only the carrier chrominance signal subjected to the low-frequency conversion is extracted, and the frequency demodulation circuit 35 returns the carrier chrominance signal to a carrier chrominance signal of 3.58 MHz.
Here, the FM demodulation circuit 33 and the frequency demodulation circuit 3
Reference numeral 5 integrally forms the demodulation circuit 40. Thus F
The luminance signal and the carrier chrominance signal demodulated by the M demodulation circuit 33 and the frequency demodulation circuit 35 are mixed by the YC mixing circuit 36 to form a composite video signal. This composite video signal is transferred to the video output interface 20 via the IIC bus 40 after being subjected to predetermined amplification by the output amplifier 37.

Although the video head 12 is directly connected to the microcomputer 70, the signal processing IC 30 and the microcomputer 70 are connected to each other via the IIC bus 40, and the microcomputer 70 inserts and removes the video tape. The control of the video deck as a whole, such as the control of the drive mechanism, is performed. Further, an on-screen display (OSD) circuit 71 is built in the microcomputer 70, and a predetermined character or graphic image can be superimposed on a video signal generated by the signal processing IC 30 and displayed. For example, it is possible to display a picture control setting screen, a channel setting screen, a channel display, a remaining tape amount, and the like as characters or graphic images. In the present embodiment, the microcomputer 70 and the signal processing IC 30
Exist independently of each other, but they can also be configured integrally.

In addition to the above, an EEPROM 60 for storing initial settings and the like and an infrared flickering signal output from a remote controller 80 are input to the IIC bus 40 to perform predetermined signal conversion. An infrared interface 81 for transferring the blinking signal to the microcomputer 70 is also connected. The EEPROM 60 is a non-volatile storage area, and the microcomputer 70 writes preset data indicating the presence / absence of a broadcasting station, the configuration status of devices, and the like, in addition to the set value of the channel frequency, and refers to it when necessary. In the present embodiment, an image quality adjustment parameter table set by the operation panel 50 or the remote controller 80 is written in the EEPROM 60 as described later. Of course, other storage elements or the like can be employed, and the data may be stored in another RAM area or the like each time the power is turned on.

Here, the luminance signal and the carrier chrominance signal are input to the image quality adjustment circuit 38 before being mixed by the YC mixing circuit 36 in the demodulation circuit 40. This image quality adjustment circuit 3
8 reads the image quality adjustment parameter table written in the EEPROM 60 and corrects the luminance signal and the carrier color signal based on the parameter table.

FIG. 3 shows the structure of the image quality adjustment parameter table written in the EEPROM 60. In the figure, the image quality adjustment parameter table is DOC
(Dropout control) DOC correction 100 as a processing parameter, and noise reduction 101 for setting the frequency band of the noise component included in the luminance signal and the carrier chrominance signal when the noise component is attenuated.
And tone correction parameters 102 and 103 for adjusting the degree of color of the reproduced video, and parameters 105 for modulating a predetermined frequency band to sharpen the video. Then, the image quality adjustment circuit 38 reads out the image quality adjustment parameter table thus configured, and outputs the luminance signal and the frequency demodulation circuit 3 output from the FM demodulation circuit 33 based on the set values of these parameters.
5 is corrected.

FIG. 4 is a flowchart showing the outline of the image quality adjustment processing executed by the video deck 10 when the user of the video deck 10 adjusts the image quality of the reproduced video. In FIG. 1, when the user of the video deck 10 selects the parameter setting function of the video deck 10 using the remote controller 80 or the operation panel 50, the microcomputer 7
0 detects a parameter setting request by this selection (step S100), and causes the OSD circuit 71 to display a setting selection screen shown in FIG. 5 on a display (not shown) connected to the video output interface 20. Here, the user depresses a selection key on the operation panel 50 or the remote controller 80 to perform the following operations. Select the image quality adjustment. Then, the microcomputer 70 detects this selection and causes the OSD circuit 71 to display an image quality adjustment parameter table setting screen corresponding to the image quality adjustment parameter table shown in FIG. 6 and shown in FIG.

Here, the operation panel 50 or the remote controller 8
Use the 0 selection key to check the video being played back with the parameters "DOC correction", "Noise reduction", "Tint (red)", "Tint (blue)", "Outline" and "Sharpness". Meanwhile, the microcomputer 70 performs a change operation by inputting a desired set value, and the microcomputer 70 temporarily stores the set value in a built-in RAM. The change operation of the set value is completed by selecting “decision” (step S110). When the microcomputer 70 detects the completion of the change operation by the selection of “decision”, the microcomputer 70 sets each parameter temporarily stored in the RAM. Is written in the image quality adjustment parameter table written in the EEPROM 60,
Update (step S110). And the microcomputer 70
Uses the updated image quality adjustment parameter table as a signal IC.
30 via the IIC bus 40 (step S1).
15). Here, the image quality adjustment circuit 36 of the signal processing IC 30
Reads the transferred image quality adjustment parameter table and corrects the luminance signal and the carrier chrominance signal based on the content of each parameter in the image quality adjustment parameter table (step S120).

In the present embodiment, a configuration is adopted in which each parameter of the image quality adjustment parameter table shown in FIG. 3 is appropriately changed and corrected to adjust the image quality. Of course, the configuration of the image quality adjustment parameter table is However, the present invention is not limited to this. As shown in FIG. 7, a plurality of image quality adjustment parameter tables are written in the EEPROM 60, and the user selects one image quality adjustment parameter according to the image quality situation. The configuration may be as follows. In such a case, the image quality adjustment circuit 38 may read out one selected image quality adjustment parameter and correct the luminance signal and the carrier chrominance signal in accordance with the parameters included in the read image quality adjustment parameter table. . That is, each image quality adjustment parameter table is distinguished corresponding to a pattern in which the image quality deteriorates. If the user determines the image quality state and selects one image quality adjustment parameter table, the image quality adjustment parameter table is averaged. It will be possible to obtain a well-organized image. Further, even when a plurality of image quality adjustment parameter tables are configured as described above, it is needless to say that the set values of the parameters included in each image quality adjustment parameter table can be appropriately changed.

Next, the operation of this embodiment having the above configuration will be described. The user of the VCR 10 inserts a video tape to be viewed into the VCR 10 and selects playback using the remote controller 80. Here, for example, this video tape is a rental video tape, and if there is a flaw, a noise component is generated in the reproduced video or a color shift occurs. At this time, the remote control 80
When the parameter setting function is selected in, a screen showing a setting list shown in FIG. 5 is displayed. Here, 1. 6 is displayed, and the screen shown in FIG. 6 is displayed.
While checking the reproduced image of "OC correction", "noise reduction", "hue (red)", "hue (blue)", "outline", and "sharpness", input a desired set value. Then, when the input of the set value is completed, “enter” is selected. Thereby, the reproduced video can be adjusted.

As described above, the user of the video deck can change each parameter to a desired set value by changing the image quality adjustment parameter table written in the EEPROM 60 using the remote controller 80. become. Therefore, it is possible to adjust the image quality of a video image that is easily reproduced by a simple operation, and it is also possible to adjust the image quality to a user's preference.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram of a video deck according to an embodiment of the present invention.

FIG. 2 is a schematic block diagram of a signal processing IC of the video deck.

FIG. 3 is a diagram showing a configuration of an image quality adjustment parameter table.

FIG. 4 is a flowchart showing processing contents of an image quality adjustment processing executed in the video deck.

FIG. 5 is a diagram showing a parameter setting screen displayed on a display connected to the video deck.

FIG. 6 is a diagram showing an image quality adjustment parameter table setting screen displayed on a display connected to the video deck.

FIG. 7 is a diagram showing another configuration of the image quality adjustment parameter table.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 12 ... Video head 30 ... Signal processing IC 31 ... Head amplifier 32 ... High pass filter 33 ... FM demodulation circuit 34 ... Low pass filter 35 ... Frequency demodulation circuit 36 ... YC mixing circuit 37 ... Output amplifier 38 ... Image quality adjustment circuit 40 ... Demodulation circuit

Claims (4)

[Claims] 1. A signal processing IC for performing predetermined signal processing on a recording signal read by a video head to generate a reproduced video signal, and adjusting a quality of a reproduced video based on the reproduced video signal generated by the signal processing IC. A parameter table having a plurality of parameters to be transferred; a microcomputer for transferring the setting contents of the parameter table to the signal processing IC at a predetermined timing; connecting the signal processing IC to the microcomputer and the parameter table; A video deck comprising: an IIC bus for transferring; and parameter operating means for changing and setting the contents of the parameter table via the IIC bus. 2. The video deck according to claim 1, wherein the parameter operation means displays a setting content of a parameter table on a screen displaying an image based on a reproduced video signal by an OSD function, and performs a predetermined operation content. A video deck, wherein the setting contents of each parameter in the parameter table are changed and operated by a remote controller for transferring the video data. 3. The video deck according to claim 1, wherein the microcomputer has a plurality of parameter tables in which a plurality of parameters for adjusting a predetermined image quality are defined.
A video deck, wherein the parameter operation means selects one parameter table from the parameter table. 4. A video deck image quality adjusting method for correcting the setting contents of a parameter table having parameters for adjusting the picture quality of a reproduced video image from a remote controller executing each operation of the video deck. A parameter operation step of changing the setting contents of the parameter table, and a parameter for transferring the setting contents of the parameter table to a signal processing IC connected via the IIC bus when the parameter table is changed in the parameter operation step. A video deck image quality adjustment method, comprising: a transfer step; and an adjustment step of adjusting a video signal to be reproduced based on setting contents of a parameter table transferred in the parameter transfer step.