KR100727120B1 - TV and method for auto processing offset and gain of image signal - Google Patents

Abstract

The present invention provides a television receiver and a method for automatically setting and adjusting an offset and a gain used for processing a black level signal and a white level signal in a process of converting an analog signal into a digital signal. A first step of setting an automatic signal conversion control mode in response to an execution command of; A second step of determining whether a black level signal and a white level signal are currently output to the screen after setting the automatic signal conversion control mode; If the black level signal is outputted as a result of the determination, a third step of increasing and resetting the offset values set in the A / D converter by a predetermined ratio and linking and storing the reset offset values with corresponding channel information; And if the white level signal is output as a result of the determination, resetting the gain value set in the A / D converter by a predetermined ratio, respectively, and resetting the reset gain value by linking with the corresponding channel information. .

TV, offset, gain, video signal

Description

TV receiver and method for automatic processing of image signal offset and gain {TV and method for auto processing offset and gain of image signal}

1 is a block diagram of a television receiver for automatic processing of offset and gain of a video signal according to an embodiment of the present invention.

2A is a flowchart of a method for automatically processing offset of a video signal in a television receiver according to an embodiment of the present invention.

2B is a flowchart of a method for automatically processing gain of a video signal in a television receiver according to an embodiment of the present invention.

3 is a screen diagram illustrating an automatic process of gain and offset of a video signal according to an embodiment of the present invention.

4A is an exemplary diagram for explaining an automatic process of offsetting a video signal in a television receiver according to an embodiment of the present invention.

4B is an exemplary diagram for explaining an automatic process of gain of a video signal in a television receiver according to an embodiment of the present invention.

5 is a flowchart illustrating a method for automatically processing offset and gain of a video signal in a television receiver according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

100: TV receiver 101: Tuner

102: demodulation unit 103: A / D converter

104: signal separation unit 105: audio decoder

106: video decoder 107: speaker

108: audio processor 109: amplifier

110: screen 111: video processing unit

112: first storage unit 113: second storage unit

114: image processing unit 115: control unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver, and more particularly, to a television receiver and a method capable of automatically setting and adjusting an offset and a gain used for processing a black level signal and a white level signal in a process of converting an analog signal into a digital signal. .

Along with the rapid development of science and technology, the multimedia field that combines various types of information such as video and audio, in the rapid development of information and communication, which is also called the digital revolution, the form of storage and existence of information is becoming digital from analog. Due to the development of MPEG technology, which is a compression standard for moving picture data for compressing digital video data that requires relatively large amounts of data, the size of digital video data is gradually getting smaller. Digital video and audio services have been provided in all fields, and digital devices for providing such services have emerged.

Among them, TV occupies an important place as an easy and effective information transmission medium in daily life, and thanks to the digital technology described above, video data and audio data are compressed and transmitted by MPEG technology, which makes a large amount of information faster and more stable. With the advent of digital TV, which can be provided by the user, more broadcasts can be easily enjoyed at home with clearer picture quality and more vivid sound.

Therefore, the capacity can be increased by 4 ~ 8 times compared to the existing analog method, so that it can provide services in various fields such as sports, movies, home shopping, and music. As more and more video services are provided, such as demand, viewers can select and watch according to their own preferences, and viewers have a wider choice, and as a variety of broadcasts are provided, viewers can watch TV corresponding to many channels. Select to watch the desired broadcast.

In the case of such a TV, a tuner receives a broadcast signal transmitted from a broadcasting station and outputs a video signal to an A / D converter, and the A / D converter converts an analog video signal output from the tuner into a digital video signal. have. The A / D converter samples an analog broadcast signal according to a fixed gain value and converts the analog broadcast signal into a digital broadcast signal, and also converts the analog broadcast signal into a digital broadcast signal according to a fixed offset value. Because of this, it is the cause of buried black level signal and saturation of white level signal, which does not take into account the difference in radio frequency (RF) signal performance of each broadcasting channel. This is because the offset and gain values are fixed in the D converter.

The present invention has been made to solve the above problems, an object of the present invention is to automatically set the offset and gain used in the black level signal and white level signal processing in the process of converting an analog signal into a digital signal Provided are an adjustable television receiver and method.

Another object of the present invention is to automatically adjust the offset used for black level signal processing for each channel in the process of converting an analog signal into a digital signal, thereby adjusting the black level signal among video signals received from specific channels among a plurality of channels. Provided are a television receiver and a method capable of preventing buried phenomenon.

Another object of the present invention is to automatically adjust the gain used for the white level signal processing for each channel in the process of converting an analog signal into a digital signal, thereby adjusting the white level signal among video signals received from specific channels among a plurality of channels. Provided are a television receiver and a method capable of preventing saturation of a device.

The present invention for achieving the above object, A / D conversion means for matching the black level of the video signal according to the set offset value and sampling the input analog broadcast signal according to the set gain value and converting it into a digital broadcast signal; Image processing means for receiving an image signal subjected to the signal conversion process in the A / D conversion means and displaying the image signal on a screen, and detecting and outputting information on the image signal displayed on the screen; Receives and stores information on an image signal currently output to the screen from the image processing means. If the stored image signal information includes a black level signal and a white level signal, an offset value set in the A / D conversion means. And controlling means for increasing and decreasing the gain value by a predetermined ratio, respectively, and controlling the reset offset value and the gain value to be linked and stored with the channel information currently output on the screen. And storage means for storing the information related to the video signal output to the screen and the offset value corresponding to the black level value set in the A / D conversion means and the gain value corresponding to the white level value by linking the channel information with the corresponding channel information. do.

According to an aspect of the present invention, there is provided an apparatus comprising: storage means for storing an offset value corresponding to a black level value and a gain value corresponding to a white level value by linking it with channel information, and storing information about an image signal output on a screen; Receives information about an image signal currently being output to the screen and stores it in the storage means, and the offset value and gain depending on whether the offset value and the gain value linked to the channel output to the screen are stored in the storage means. Control means for resetting an offset and a gain value by reading a value; A / D conversion means for matching the black level of the video signal according to the set offset value according to the control signal of the control unit and sampling the input analog broadcast signal to a digital broadcast signal according to the set gain value; And image processing means for receiving an image signal subjected to the signal conversion process in the A / D conversion means and displaying the image signal on the screen, and detecting and outputting information on the image signal displayed on the screen.

According to an aspect of the present invention, there is provided a system comprising: a first step of setting an automatic signal conversion control mode for automatically controlling resetting of an offset value and a gain value set in an A / D converter when an execution command of an automatic signal conversion control function is input; A second step of determining whether a black level signal and a white level signal are currently output to the screen after setting the automatic signal conversion control mode; If the black level signal is outputted as a result of the determination, a third step of increasing and resetting the offset values set in the A / D converter by a predetermined ratio and linking and storing the reset offset values with corresponding channel information; And if the white level signal is output as a result of the determination, resetting the gain value set in the A / D converter by a predetermined ratio, respectively, and resetting the reset gain value by linking with the corresponding channel information. .

According to the present invention, a specific channel which has undergone a signal conversion process by the A / D converter in a state in which the automatic signal conversion control mode for automatically controlling the reset of the offset value and the gain value set in the A / D converter is not set. A first step of outputting the video signal of the screen; A second step of determining whether an offset value and a gain value linked to a specific channel output on the screen are stored in a storage unit; A third step of maintaining the offset value and the gain value set in the A / D converter if the offset value and the gain value are not stored as a result of the determination; And if the offset value and the gain value are stored as a result of the determination, reading the offset value and the gain value stored in the storage unit and resetting the offset value of the black level and the gain value of the white level to the A / D converter. Steps.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

1 is a block diagram of a television receiver for automatic processing of offset and gain of a video signal according to an embodiment of the present invention.

Referring to FIG. 1, a tuner 101 for tuning a plurality of broadcast channels received through different frequency bands from a plurality of broadcast stations, and a demodulator for demodulating analog broadcast signals received through the tuner 101 ( 102, the A / D converter 103 for converting the demodulated analog broadcast signal into a digital broadcast signal, and the digital broadcast signal converted by the A / D converter 103 for separating the audio signal and the video signal. A signal separator (DEMUX) 104, an audio decoder 105 for decoding the audio signal separated by the signal separator 104, and a decoder for decoding the video signal separated by the signal separator 104 The video decoder 106, the speaker 107 for outputting the audio signal to the outside, and the audio processor 108 for making the audio signal decoded by the audio decoder 105 into an electrical signal suitable for the speaker 107. With audio It amplifies the electrical signal output from the rib 108 and a amplifier 109 to output to a speaker 107.

In addition, the television receiver 100 of the present invention includes a screen 110 for displaying a video signal and a video processor for making the video signal decoded by the video decoder 106 into a signal form suitable for the screen 110. 111, a first storage unit 112 for storing an offset value corresponding to a black level value and a gain value corresponding to a white level value for each channel, and various kinds of information and an execution program, and the screen 110 The second storage unit 113 for storing information about the video signal output to the) and the video signal input from the video processing unit 111 to the screen 110, the video signal output to the screen 110 The image processing unit 114 detects information about the control unit, and receives and outputs a broadcast signal, and receives information about the image signal currently being output on the screen 110 from the image processing unit 115. On 113) And the image signal information stored in the second storage unit 113 in the automatic signal conversion control mode. When the image signal information includes the black level signal and the white level signal, the offset value and the white value corresponding to the black level value are stored. The gain value corresponding to the level value is reset in the A / D converter 103, the reset offset value and the gain value are linked with the channel information currently output on the screen 110, and stored in the first storage unit 112. The controller which reads the offset value and the gain value of the channel currently being output on the screen 110 from the first storage unit 112 and resets the A / D converter 103 in the signal conversion automatic control mode is released ( 115).

The A / D converter 103 samples an analog broadcast signal input from the demodulator 102 and converts the analog broadcast signal into a digital broadcast signal under the control of the control unit 113, and offsets the black level value by the control unit 115. If the gain values corresponding to the value and the white level value are not reset, the analog broadcast signal is sampled and converted into a digital broadcast signal according to the gain value set as the default, and the black level of the video signal is adjusted according to the offset value set as the default. If the offset value and the gain value are reset by the controller 115, the A / D converter 103 samples the analog broadcast signal according to the reset gain value, converts the analog broadcast signal into a digital broadcast signal, and outputs an image according to the reset offset value. Adjust the black level of the signal.

The first storage unit 112 may be implemented as an EEPROM and links the offset value corresponding to the black level value recorded by the controller 115 and the gain value corresponding to the white level value with the channel information. You can save it as shown in [Table 1].

  channel   Offset value   Gain value   CH1      OS1     GA1   CH2      OS2     GA2    · · ·      · · ·     · · ·   CHn      OSn     GAn

The second storage unit 113 is a storage medium for storing various information and may be implemented as a memory device such as RAM or EEPROM or a hard disk driver (HDD). In the second storage unit 113, an execution program for controlling the reception and output of the broadcast signal is set, and an execution program for executing the automatic signal conversion control function according to the present invention is set, and is recorded by the controller 115. Information about the video signal being stored, that is, information about the video signal including the black level signal and the white level signal currently output to the screen 110 is stored.

The image processor 114 is set by the main image module 114-1 and the controller 115 to output the video signal input from the video processor 111 to the screen 110 under the control of the controller 115. Contrast set by the brightness module 114-2 and the controller 115 for adjusting the brightness of the image signal output to the screen 110 by the main image module 114-1 according to the brightness value. Main module according to the screen size value set by the contrast module 114-3 and the controller 115 for adjusting the contrast of the video signal output to the screen 110 by the main image module 114-1 according to the value. Adjusted by the gain value set in the screen module 114-4 and the A / D converter 103 for adjusting the size of the screen composed of the image signal output to the screen 110 by the image module 114-1. Output the white level signal to the screen 110 and output The white level module 114-5 which detects the white level signal and transmits it to the control unit 115, and outputs the black level signal adjusted by the offset value set in the A / D converter 103 to the screen 110 and outputs it. It has a software function, such as the white level module 114-6 to detect the black level signal to be transmitted to the control unit 115, and has a variety of software functions for image signal processing in addition to these functions.

The controller 115 controls a channel tuning of the tuner 101 according to a channel selected through a remote controller, and controls various functions for receiving and outputting a broadcast signal according to a user command. The signal for resetting the offset value corresponding to the black level value and the gain value corresponding to the white level value and controlling the sampling of the analog broadcast signal in the A / D converter 103 according to the control of the main control module 115-1. The signal separation control module 115-3 and the main control module 115-1 for controlling the signal separation process of the signal separation unit 104 under the control of the conversion control module 115-2 and the main control module 115-1. The audio of the audio processor 108 under the control of the decoding control module 115-4 and the main module 115-1 for controlling the decoding process of the audio decoder 105 and the video decoder 106 under the control of. Signal conversion process and video signal conversion of the video processor 111 The image processing unit 114 is controlled under the control of the signal processing control module 115-5 and the main control module 115-1 for controlling the conversion process, and the image processing unit 114 receives the detected image signal information. It has a software function, such as the image control module 115-6 to deliver to the main control module 115-1, and has various software functions for receiving broadcasts and video input and output in addition to these functions.

The main control module 115-1 temporarily stores channel information tuned by the tuner 101 and currently being output on the screen 110, and when the user instructs execution of the automatic signal conversion control function, the A / D converter 103. After setting the automatic signal conversion control mode for automatically adjusting the gain value and the offset value during the signal conversion process, the image signal information stored in the second storage unit 113 is read in the automatic signal conversion control mode. If the signal information includes the black level signal and the white level signal, the signal conversion control module 115-2 is controlled to reset the offset value and the gain value, and the offset value reset by the signal conversion control module 115-2. And the gain value are linked to the channel information currently output on the screen 110 and stored in the first storage unit 112. When the user instructs to release the automatic signal conversion control mode by using a remote controller or the like, after canceling the automatic signal conversion control mode, the first storage unit 112 is searched and the channel information currently being outputted to the screen 110 is displayed. If it is determined that the linked offset value and the gain value are stored, and stored, the gain value and the offset value linked with the current channel information are read from the first storage unit 112 to the signal conversion control module 115-2. The signal conversion control module 115-2 is controlled to transmit and reset the gain value and the offset value to the A / D converter 103. If the offset value and the gain value linked to the channel information currently output on the screen 110 are not stored in the first storage unit 112, the main control module 115-1 may set the offset value and the gain value set as default. The signal conversion control module 115-2 is controlled to perform the signal conversion according to the present invention.

The main control module 115-1 transmits the offset value and the gain value reset from the signal conversion control module 115-2 to the A / D converter 115-2 and displays the offset value and the gain value in the current screen 110. Information about an image signal that is linked to channel information being output to the first storage unit 112 and is output from the image processing unit 114 to the current screen 110, for example, the white level module 114-5. When the white level signal detected by the black level signal information and the black level signal information detected by the black level module 114-6 are transferred to the image control module 115-6, the white level signal is transmitted through the image control module 115-6. And the black level signal are received and linked with the current channel information and stored in the second storage unit 113.

The main control module 115-1 controls the brightness and contrast of the video signal according to the input brightness and contrast when the brightness and contrast values are newly input from the user. To control. In addition, when a screen size value is newly input from the user, the main control module 115-1 controls the image control module 115-6 to adjust the screen size on the screen 110 according to the input screen size value.

The signal conversion control module 115-2 resets the gain value and the offset value of the A / D converter 103 when a control command for resetting the offset value and the gain value is input from the main control module 115-1. The reset gain and offset values are informed to the main module 115-1. When the main control module 115-1 reads the offset value and the gain value stored in the first storage unit 112, transmits them to the signal conversion control module 15-2 and instructs the reset at the same time, the signal conversion control module 115- 2) resets the input offset value and the gain value to the A / D converter 103.

When the brightness control value, the contrast value, or the screen size value is transmitted from the main control module 115-1 and a control command for re-adjustment is inputted, the image control module 115-6 displays an image of the brightness value. The brightness is adjusted to the brightness module 114-2 of the processing unit 114 to control the brightness again, and the contrast is reset to the contrast module 114-3 of the image processing unit 114 to re-adjust the contrast. Or, the screen size value is reset to the screen module 114-4 of the image processor 114 to control the screen size. When the information about the video signal output from the image processing unit 114 to the current screen 110, that is, the information about the video signal including the black level signal and the white level signal, is transferred, the image control module 115-6. Transmits the video signal information to the main module 115-1.

A process of automatically adjusting the offset and gain of a video signal by the television receiver of the present invention having the above-described configuration and function will be described with reference to a flowchart.

2A is a flowchart of a method for automatically processing offset of a video signal in a television receiver according to an embodiment of the present invention.

Referring to FIG. 2A, first, when a user presses a menu key on a remote controller, as shown in FIG. 3, the controller 115 displays predetermined top-level menu items including an automatic signal conversion control item on the screen 102 (S210). At this time, when the user presses a button on the remote control to select the automatic signal conversion control item (S210-2), the controller 115 sets the automatic signal conversion control mode (S210-3). If a hot key for executing the automatic signal conversion control function is attached to a remote controller or the like, the user may instruct the execution of the automatic signal conversion control function by pressing the hot key.

After setting the automatic signal conversion control mode, the control unit 114 reads the image signal information stored in the second storage unit 113 to determine whether the black level signal is included in the image signal information, that is, the current screen 110. It is determined whether or not the black level signal is output on step S210-4. If the black level signal is not stored as a result of the determination, the controller 114 determines that the black level signal is not currently output on the screen 110, and converts the analog signal into a digital signal according to a predetermined offset value. The A / D converter 103 is controlled to match the black level of the signal. Accordingly, the A / D converter 103 samples the black signal of the video signal according to a predetermined offset value in the process of sampling and converting the analog signal into a digital signal. Adjust the level (S210-5).

If the black level signal is stored as a result of the determination, the controller 114 determines that the black level signal is currently output on the screen 110, and resets the offset value set by the A / D converter 103 by 50%. (S210-6). At this time, the A / D converter 103 adjusts the black level of the image signal according to the offset value reset in the process of sampling the analog signal and converting the analog signal into the digital signal (S210-7).

When the black level of the video signal is adjusted according to the offset value reset during the signal conversion process, when the black level of the video signal is adjusted according to the reset offset value as shown in FIG. The black level value 'BL' is increased in the signal so that the black level signal is not buried. In FIG. 4A, the section 'd1' is a region where the black level signal is buried, and is a characteristic of the video signal that appears when the black level of the video signal is adjusted according to the offset value set before resetting the offset value.

Subsequently, the image processor 114 detects the black level value 'BL' from the image signal subjected to the signal conversion according to the reset offset value, and transmits the black level value 'BL' to the controller 115, and then the controller 115 determines the black level value 'BL'. 'Is stored in the second storage unit 113 (S210-8). The controller 115 reads the black level value 'BL' stored in the second storage unit 113 and resets the offset value corresponding to the black level value 'BL', that is, the A / D converter 103. The offset value is linked to the channel information currently output on the screen 110 and stored in the first storage unit 112 (S210-9). For example, when the channel currently being output on the screen 110 is CH1, the controller 115 links and resets the offset value 'OS1' which is reset as shown in [Table 1] with the channel CH1.

In the storage processes S210-8 and S210-9, the black level value 'BL' is stored in the second storage unit 113, and the control unit 115 reads the black level value BL again, thereby resetting the signal by the reset offset value. The conversion is performed so that the controller 115 can recognize that the buried phenomenon of the black level signal is removed. Here, although the image processor 114 stores the black level value 'BL' in the second storage unit 113 through the controller 115, the storage method is not limited thereto. For another example, the image processing unit 114 may directly store the black level value 'BL' in the second storage unit 113 and implement the present invention so that the controller 115 reads it. In this case, the image processing unit ( 114 transmits address information of the memory area storing the black level value 'BL' to the controller 115.

FIG. 2B is a flowchart illustrating a method for automatically processing gain of a video signal in a television receiver according to an embodiment of the present invention. However, the process of resetting the gain value described below may include resetting the offset value described with reference to FIG. 2A. And to be carried out at the same time, for convenience of description the present invention will be described by dividing into 2a and 2b.

Referring to FIG. 2B, in a state in which the automatic signal conversion control mode is set through the setting processes S210-1 to S210-3 in FIG. 2A, the controller 114 stores the image signal information stored in the second storage unit 113. In operation S220-1, it is determined whether the white level signal is included in the video signal information, that is, whether the white level signal is currently output on the screen 110. If the white level signal is not stored as a result of the determination, the controller 114 determines that the white level signal is not currently output on the screen 110 and converts the analog signal into a digital signal in accordance with a predetermined gain value. The D converter 103 is controlled, and accordingly, the A / D converter 103 samples an analog signal according to a predetermined gain value and converts the analog signal into a digital signal (S220-2).

As a result of the determination, if the white level signal is stored, the controller 114 determines that the white level signal is currently output on the screen 110 and resets the gain value preset by the A / D converter 103 by reducing the gain value by 50%. (S220-3). At this time, the A / D converter 103 samples the analog signal according to the reset gain value and converts the analog signal into a digital signal (S220-4).

When the video signal is converted according to the gain value reset in the signal conversion process, as shown in FIG. 4B, when the signal is converted according to the reset gain value, the white level value 'WL' is output from the video signal output to the screen 110. Decreases and the saturation of the white level signal is eliminated. In FIG. 4B, the section 'd2' is a region where the white level signal is saturated, and is a characteristic of an image signal that appears when the signal is converted in accordance with a gain value set before resetting the gain value.

Subsequently, the image processor 114 detects and transmits the white level value 'WL' to the control unit 115 in the image signal in which the signal is converted according to the reset gain value, and then the control unit 115 transmits the white level value 'WL'. 'Is stored in the second storage unit 113 (S220-5). The controller 115 reads the white level value 'WL' stored in the second storage unit 113 and resets the gain value corresponding to the white level value 'WL', that is, the A / D converter 103. The gain value is linked with the channel information currently output on the screen 110 and stored in the first storage unit 112 (S220-6). For example, when the channel currently being output to the screen 110 is CH1, the controller 115 links and stores the reset gain value 'GA1' as shown in [Table 1] with the channel CH1. That is, the controller 115 links the reset offset value 'OS1' and the gain value 'GA1' with the channel CH1 and stores the reset value 'OS1' in the first storage unit 112.

In the storage processes S220-5 and S220-6, the white level value 'WL' is stored in the second storage unit 113, and the controller 115 reads the white level value 'WL' again, thereby resetting the signal by the reset gain value. The conversion is performed so that the controller 115 can recognize that the saturation phenomenon of the white level signal has been eliminated. Here, although the image processor 114 stores the white level value 'WL' in the second storage unit 113 through the control unit 115, the storage method is not limited thereto. For another example, the image processing unit 114 may directly store the white level value 'WL' in the second storage unit 113 and implement the present invention so that the controller 115 reads it. In this case, the image processing unit ( 114 transmits address information of the memory area storing the white level value 'WL' to the controller 115.

A process of resetting the offset value and the gain value stored in the first storage unit 112 to the A / D converter 103 through the processes as described with reference to FIGS. 2A and 2B will be described with reference to FIG. 5.

5 is a flowchart illustrating a method of automatically processing offset and gain of a video signal in a television receiver according to an embodiment of the present invention.

Referring to FIG. 5, when the image conversion automatic control mode is not released or set, when the image processing unit 114 outputs an image signal of a channel tuned by the tuner 101 to the screen 110 (S510). The controller 115 searches the first storage 112 and determines whether an offset value and a gain value linked to the channel currently being output on the screen 110 are stored (S520).

If it is determined that the offset value and the gain value are not stored, the controller 114 controls the A / D converter 103 to adjust the black level of the video signal according to a predetermined offset value in the process of converting the analog signal into the digital signal. And control the A / D converter 103 to sample the analog signal and convert the analog signal into a digital signal according to a predetermined gain value, and in response thereto, the A / D / converter 103 according to the predetermined offset value. The black level of the video signal is matched and the signal is converted according to a predetermined gain value (S530).

If the offset value and the gain value are stored as a result of the determination, the control unit 114 reads the offset value and the gain value stored in the first storage unit 112 and resets them to the A / D converter 103 (S540). Accordingly, the A / D converter 103 adjusts the black level of the video signal according to the offset value reset in the process of converting the analog signal into the digital signal, and also samples the analog signal according to the reset gain value and digitally converts the digital signal. Convert to (S550).

Although the technical spirit of the present invention has been described in detail according to the above-described preferred embodiment, it should be noted that the above-described embodiment is for the purpose of description and not of limitation. In addition, those skilled in the art will understand that various embodiments are possible within the scope of the technical idea of the present invention.

As described above, the present invention, by converting an analog signal to a digital signal, by automatically setting and adjusting the offset and gain used for the black level signal and white level signal processing, respectively, from a particular channel among a plurality of channels The buried phenomenon of the received black level signal and the saturation of the white level signal can be prevented, thereby providing a good image.

Claims (12)

A / D conversion means for matching the black level of the video signal according to the set offset value and sampling the input analog broadcast signal according to the set gain value and converting it into a digital broadcast signal; Image processing means for receiving an image signal subjected to the signal conversion process in the A / D conversion means and displaying the image signal on a screen, and detecting and outputting information on the image signal displayed on the screen; Receives and stores information on an image signal currently output to the screen from the image processing means. If the stored image signal information includes a black level signal and a white level signal, an offset value set in the A / D conversion means. And controlling means for increasing and decreasing the gain value by a predetermined ratio, respectively, and controlling the reset offset value and the gain value to be linked and stored with the channel information currently output on the screen. And Storage means for linking and storing information about an image signal output on a screen and a gain value corresponding to a white level value and an offset value corresponding to a black level value set in the A / D conversion means with the corresponding channel information TV receiver comprising a. The method of claim 1, And the control means resets the offset value set by the A / D conversion means by 50% if the black level signal is included in the image signal information stored in the storage means. The method according to claim 1 or 2, And the control means resets the gain value set in the A / D conversion means by 50% if the white level signal is included in the image signal information stored in the storage means. Storage means for storing the offset value corresponding to the black level value and the gain value corresponding to the white level value by linking the channel information with the channel information, and storing information about an image signal output on the screen; Receives information about an image signal currently being output to the screen and stores it in the storage means, and the offset value and gain depending on whether the offset value and the gain value linked to the channel output to the screen are stored in the storage means. Control means for resetting an offset and a gain value by reading a value; A / D conversion means for matching the black level of the video signal according to the set offset value according to the control signal of the control unit and sampling the input analog broadcast signal to a digital broadcast signal according to the set gain value; And Image processing means for receiving a video signal that has undergone a signal conversion process in the A / D conversion means and displayed on the screen, and detects and outputs information on the video signal displayed on the screen TV receiver comprising a. The method according to claim 1 or 4, The storage means, A first storage unit for storing the offset value and the gain value recorded by the control means in link with channel information; And A second storage section for storing image signal information detected by the image processing means recorded by the control means TV receiver comprising a. A first step of setting an automatic signal conversion control mode for automatically controlling resetting of an offset value and a gain value set in the A / D converter when an execution command of the automatic signal conversion control function is input; A second step of determining whether a black level signal and a white level signal are currently output to the screen after setting the automatic signal conversion control mode; If the black level signal is outputted as a result of the determination, a third step of increasing and resetting the offset values set in the A / D converter by a predetermined ratio and linking and storing the reset offset values with corresponding channel information; And A fourth step of reducing and resetting the gain value set in the A / D converter by a predetermined ratio if the white level signal is output as a result of the determination; linking and storing the reset gain value with corresponding channel information Automatic processing of the gain and offset of the video signal in a television receiver comprising a. The method of claim 6, In the second step, the storage unit storing the video signal information currently output on the screen is checked to determine whether the stored video signal information includes the black level signal and the white level signal, and the black level on the screen through the confirmation result A method for automatically processing gain and offset of a video signal in a television receiver, characterized in that it is determined whether a signal and a white level signal are output. The method of claim 6, A fifth step of maintaining the offset value set in the A / D converter until the black level signal is output to the screen when the black level signal is not output as a result of the determination in the second step; The automatic processing method of the gain and offset of the video signal in a television receiver further comprising. The method of claim 6, A fifth step of maintaining a gain value set in the A / D converter until a white level signal is output to the screen when the white level signal is not output as a result of the determination in the second step; The automatic processing method of the gain and offset of the video signal in a television receiver further comprising. The method of claim 6, In the third step, the gain and offset of the video signal in the television receiver, characterized in that for increasing the offset value set in the A / D converter by 50%. The method of claim 6, And in the fourth step, the gain value set in the A / D converter is reduced by 50%. When a signal conversion automatic control mode for automatically controlling the offset value and the gain value set in the A / D converter is not set, the video signal of the specific channel that has undergone the signal conversion process by the A / D converter is A first step of outputting to the screen; A second step of determining whether an offset value and a gain value linked to a specific channel output on the screen are stored in a storage unit; A third step of maintaining the offset value and the gain value set in the A / D converter if the offset value and the gain value are not stored as a result of the determination; And A fourth step of resetting the offset value and the gain value of the black level and the gain value of the white level to the A / D converter by reading the offset value and the gain value stored in the storage if the offset value and the gain value are stored as a result of the determination. Automatic processing of the gain and offset of the video signal in a television receiver comprising a.

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