KR100198343B1 - Screen controlling circuit and method of serial data controlling for vcr - Google Patents

Abstract

The present invention relates to an image control circuit and method by serial data control in VCS (VCR), in which an image control circuit for reducing the distortion of an image signal converts the response characteristic thereof into dB, digitizes it, digitizes and stores it , And to perform image control on the OSD screen conveniently by controlling the OSD processing operation with serial data.

To this end, the present invention provides a tuner comprising: a tuner unit for tuning a signal coming from an antenna; A video / audio signal processing unit for processing the video and audio signals tuned in the tuner unit; A remote controller and a remote controller receiver for interfacing with a user; A microprocessor for controlling and managing the overall operation of the VISIR system; A serial data control switching unit for controlling response characteristics of an image control circuit used for preventing image signal distortion by control of the microprocessor with serial data; A memory unit for storing an image control value controlled by the serial data control switching unit; And an OSD processing unit for generating an arbitrary character according to a control signal of the microprocessor and outputting a character to the OSD screen. In addition, the present invention is characterized in that when it is determined whether to perform image control, Displaying an OSD screen for selecting an image control level; Selecting an image control level after the step and performing a control operation of an image control circuit relating to the level; And when the other level is selected after the step is performed, returning to the step of executing the control operation of the image control circuit, and completing the image control operation if the other level is not selected.

Description

Image control circuit and method by serial data control in VCS (VCR)

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image control circuit and method by serial data control in a VCR system and more particularly to an image control circuit for reducing distortion of an image signal, And controls the image data with serial data using an on-screen display (hereinafter, referred to as OSD) processing operation, so that image control can be conveniently performed on the OSD screen.

In general, a conventional VISIAL image signal processing system is divided into two systems, a luminance signal system and a color signal system. The input image signal is first applied to the automatic gain control circuit, and when the level of the input signal fluctuates, So that the output synchronization level is always constant.

Next, the video signal whose output is constantly adjusted in the automatic gain control circuit is separated into a luminance signal and a color signal respectively through a low-pass filter and a band-pass filter, and the color signal is converted into a low-frequency region near 600 KHz by a frequency converter . Then, the signal is superimposed on the FM-modulated luminance signal, amplified by the recording amplifier, and then supplied to the two image heads through the rotary transformer, thereby being recorded on the tape. Since the image signal to be recorded at this time operates the alternating current bias of the FM signal with respect to the color signal, it is possible to record the image signal with less distortion.

In an image control circuit used for reducing the distortion of the image signal, the response characteristic is converted into a gain value, converted into a digital signal, and stored in a memory. Data is input to the microprocessor through a serial data control switching unit And an object thereof is to provide an image control circuit and method by serial data control in a VCR capable of performing image control by selecting digital data on an OSD.

According to an aspect of the present invention, there is provided a tuner comprising: a tuner unit for tuning a signal received from an antenna; A video / audio signal processing unit for processing the video and audio signals tuned in the tuner unit; A remote controller and a remote controller receiver for interfacing with a user; A microprocessor for controlling and managing the overall operation of the VISIR system; A serial data control switching unit for controlling response characteristics of an image control circuit used for preventing image signal distortion by control of the microprocessor with serial data; A memory unit for storing an image control value controlled by the serial data control switching unit; And an OSD processing unit for generating an arbitrary character according to a control signal of the microprocessor and outputting a character to the OSD screen, wherein the OSD processing unit is configured to control the serial data in the VCR .

According to another aspect of the present invention, there is provided a method of controlling an image display apparatus, the method comprising: displaying an OSD screen for selecting an image control level by entering an image control mode if it is determined that image control is to be performed; Selecting an image control level after the step and performing a control operation of an image control circuit relating to the level; (VCR) when the other level is selected after performing the step, and returning to the step of executing the control operation of the image control circuit, and completing the image control operation when the other level is not selected. The present invention also provides an image control method by serial data control.

1 is a block diagram showing a schematic configuration of a VCR for implementing the present invention;

2 is a block diagram of an image control circuit

Fig. 3 is a waveform diagram showing the response characteristic of each part of the image control circuit of Fig. 2

4 is a flow chart for explaining an image control method according to the present invention.

FIGS. 5A and 5B are diagrams illustrating screen displays for explaining the OSD process according to the present invention.

Description of the Related Art [0002]

10: Microprocessor 11: Antenna

12: tuner section 13: video / audio signal processing section

14: remote controller 15: remote controller receiver

16: Servo unit 17: Memory unit (EEPROM)

18: serial data control switching unit 19: OSD processing unit

21, 22: Delay device 23:

24, 27: subtracter 25: distributor

26,28: adder

Hereinafter, an image control circuit and method by serial data control in VCS (VCR) according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram schematically showing the configuration of an image control circuit and method according to serial data control in a VCR (VCR) according to an embodiment of the present invention. A video / audio signal processor 13 for processing video and audio signals tuned in the tuner unit, a remote controller 14 and a remote controller receiver 15 for interfacing with a user, A microprocessor 10 for controlling and controlling the overall operation of the VISCAL system; and a control unit 10 for controlling the control level of the image control circuit, which is used for preventing image signal distortion by the control of the microprocessor, (EEPROM) for storing an image control level controlled by the serial data control switching unit A servo unit 16 for controlling the recording / reproducing system, and an OSD processing unit for generating a random character according to a control signal of the microprocessor 10 and outputting characters on an OSD screen 19).

FIG. 2 is an embodiment of an image control circuit for explaining the present invention. As shown in FIG. 2, a first delay unit (delay unit) for delaying an input signal applied through a resistor R1 from an input terminal, A multiplier 23 for multiplying a signal delayed by 2? By a constant K and a multiplier 23 for multiplying an input signal applied through the resistor R1 by a constant K, , A first adder (26) for superimposing the output of the multiplier and a subtractor, a divider (25) for dividing the output of the adder in half, and a second subtractor A second subtracter 27 for subtracting the output of the divider from the delayed signal and a second adder 28 for adding the output of the second subtractor and the output of the first delayer to obtain an image control output.

FIG. 3 shows response characteristics of each part of the image control circuit of FIG. 2. The waveform A is an input voltage (Vin) waveform applied from the input terminal through the resistor R1. The waveform B shows that the input waveform has a first delay And the C waveform is a waveform diagram in which the output waveform of the first delay device is delayed by 2? With respect to the input waveform through the second delay device 22 while the D waveform is delayed by? (D = 1/2 (A + C)) waveform diagram of the splitter 25 obtained by adding and dividing the input waveform A and the output waveform C of the second delay device. And the E waveform is an output (E = BD) waveform of the second subtractor 27 obtained by subtracting the output waveform D of the divider from the output waveform B of the first delay. Finally, the waveform of the F (F = B + E) waveform diagram of the second adder 28 which superimposes the output waveform B and the output waveform E of the second subtracter.

Here, the output waveforms of the respective output waveforms commonly denote the case where the value of the constant K is K = 1. The first delay unit 21, the second delay unit 22, The input waveforms applied to the input terminal 23 are

A = sin? (T +?),

B = sin? T,

C = sin? (T -?)

And therefore the output Vout of the image control circuit is expressed by

Vout = 2B - 1/2 {(2-K) A + KC}

= (2 - cosωτ) sinωt - (1-K) sinωτ · cosωt

, And its absolute value (| Vout |) is expressed by

| Vout | =

The gain characteristic of the image control circuit is

Av = | Vout | / | Vin |

, And converting this into dB

dB = 20 log | Av |

.

FIG. 4 is a flow chart for explaining an image control method according to the present invention. In FIG. 4, it is determined whether image control is to be performed (S41) A step (S42) of displaying an OSD screen for selecting a control level, a step (S43) of selecting an image control level when the image control level is designated in the displaying step, (S45) of judging whether or not another level is selected after executing the image control operation, and a control operation of the image control circuit when a different level is selected (S46) of returning to the executing step and completing the image level control operation when another level is not selected.

FIGS. 5A and 5B are diagrams illustrating a screen display process for explaining an OSD process according to the present invention. In the present invention, an image control 1 screen and an image control 2 screen, .

In the image control 1 OSD screen, particularly when the buttons 1 to 8 on the remote controller are pressed, the data is set to 0000 to 0111 to change the clarity (clarity) of the reproduction screen. When the 9th button on the remote controller is pressed, Screen, and pressing the 0 button on the remote control is set to hold the data before the image control setting and move to the previous screen.

In addition, in the image control 2 OSD screen, when the buttons 1 to 8 on the remote controller are pressed, data is set to 1000 to 1111 to change the clarity of the reproduction screen. When the button 9 on the remote controller is pressed, And press the 0 button on the remote control to set the previous data to be retained and move to the previous screen.

An image control circuit and method according to serial data control in a VCR (VCR) according to the present invention configured as described above will be described as follows.

First, the microprocessor 10 determines whether to perform image control (S41). If it is determined that image control is to be performed, the microprocessor 10 enters an image control mode and displays an OSD screen for selecting an image control level (S42). At this time, if the image control level is designated in the display step, the image control level is selected (S43), the level control operation of the image control circuit relating to the level is executed (S44), then it is judged whether another level is selected If the other level is selected as a result of the determination, the operation returns to the step of executing the control operation of the image control circuit. If the other level is not selected, the image level control operation is completed (S46) .

That is, the microprocessor 10 adjusts the numerical value of each signal by using the response characteristic of the image control circuit to control the serial data, converts the analog characteristic into dB, digitizes it, and stores the digital signal in the EEPROM 17. Then, data is input to the microprocessor 10 through the serial data control switching unit 18 to select the data value on the OSD to perform image control.

According to the image control method by the serial data control in the VCR according to the present invention as described above, the response characteristic is digitized and stored in the image control circuit for reducing the distortion of the signal, and then the serial data control switching There is an advantage in that image control can be conveniently performed on the OSD by selecting data values on the OSD screen by using the OSD unit.

Claims (2)

A tuner unit for tuning a signal coming from an antenna; A video / audio signal processing unit for processing the video and audio signals tuned in the tuner unit; A remote controller and a remote controller receiver for interfacing with a user; A microprocessor for controlling and managing the overall operation of the VISIR system; A serial data control switching unit for controlling response characteristics of an image control circuit used for preventing image signal distortion by control of the microprocessor with serial data; A memory unit for storing an image control value controlled by the serial data control switching unit; And an OSD processing unit for generating an arbitrary character according to a control signal of the microprocessor and outputting a character on an OSD screen. If it is determined that image control is to be performed, entering an image control mode and displaying an OSD screen for selecting an image control level; Selecting an image control level after the step and performing a control operation of an image control circuit relating to the level; (VCR) when the other level is selected after performing the step, and returning to the step of executing the control operation of the image control circuit, and completing the image control operation when the other level is not selected. In the image data.