KR100698290B1 - Television Receiver and Method for Auto Controlling Phase - Google Patents

Abstract

The present invention provides a television receiver and a method for automatically adjusting the phase of an image signal in the process of sampling an analog image signal and converting the signal into a digital signal. An interrupt is generated when a predetermined reference time elapses and a predetermined time is passed. Calculating a deviation of sampling values of the composite video signal sampled during the step; A second step of increasing or decreasing the phase of the composite video signal within a range of a predetermined maximum phase value and a predetermined minimum phase value as an interrupt is generated; A third step of sampling a composite video signal having a phase increased or decreased, and calculating deviations of sampling values of the composite video signal sampled for a predetermined time; And deciding whether to reduce the phase of the composite video signal according to the magnitude difference between the deviation of the sampling values calculated in the first step and the deviation of the sampling values calculated in the third step, and after increasing or decreasing the phase in the second step. A fourth step is passed to the first step as the predetermined reference time elapses.

TV, phase, sampling, auto, adjustable

Description

Television receiver and method for automatic adjustment of phase {Television Receiver and Method for Auto Controlling Phase}

1 is a block diagram of a television receiver for the automatic adjustment of the phase according to an embodiment of the present invention.

2A and 2B are a flowchart of a method for automatically adjusting phase 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: Screen 103: Speaker

104: A / D converter 105: video processing unit

106: audio processor 107: video output unit

108: amplifier 109: timer

110: 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 adjusting the phase of an image signal in the process of sampling an analog image signal and converting the signal into a digital signal.

In the rapid development of information and communication, to the multimedia field that combines various forms of information such as video and audio, as well as the rapid development of technology such as electricity, electronics, computer and communication, these days, also called digital revolution And presence forms are becoming digital from analog. Due to the development of MPEG (Moving Picture Experts Group) technology, which is a compression standard for moving image data to compress digital image data that requires a relatively large amount of data, the size of digital image data is gradually getting smaller. Increasingly, digital video and audio services have been applied to almost all fields such as communication and telecommunications, and digital devices for providing such services have emerged.

Among them, broadcasting and TV occupy 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, thereby adding a large amount of information. With the advent of digital TV, which can provide fast and reliable, 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, and also includes broadcasting, cable broadcasting, video on demand (VOD, Video On), etc. 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 this way, various broadcasts of various channels are provided, and accordingly, various functions are added to TVs to provide convenience to various tastes of viewers. On-screen display (OSD: On-), which displays information on the TV screen when providing information or changing the TV's settings and functions, i.e., changing the input settings, display settings, audio settings, etc. Screen Display) method is used.

In the conventional TV, a tuner (not shown) receives a composite video signal transmitted from a broadcasting station, outputs a video signal to an A / D converter (not shown), and outputs the A / D converter from the tuner. The analog video signal was converted into a digital video signal. In this conversion process, the A / D converter changes the phase of the image signal according to a preset phase value. However, although the phase of the image signal is changed by the internal elements of the TV or the surrounding environment, there is a problem that the image output on the screen is blurred by always changing the phase of the image signal according to a predetermined phase value.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a television receiver and method that can automatically adjust the phase of the video signal in the process of sampling and converting the analog video signal into a digital signal.                         

Another object of the present invention is to provide a method capable of always keeping the phase of a video signal constant by automatically correcting the phase of the video signal in real time by the changed phase value even when the phase of the video signal received by the television receiver is changed.

Another object of the present invention is to provide a method capable of outputting a clear image on a screen by automatically real-time correcting a phase of a video signal received by a television receiver and always keeping it constant.

According to an aspect of the present invention, a television receiver for receiving a composite video signal transmitted from a broadcasting station through a tuner and outputting a video signal on a screen includes: a timer for timing timing of occurrence of an interrupt; A control unit for controlling driving of the control unit, controlling reception and output of the composite video signal, generating an interrupt at the timing, and adjusting a phase of the received composite video signal; And converting the phase into or out of phase according to the level of the sampling position of the received composite video signal under the control of the controller.

The present invention relates to a method of adjusting a phase of a video signal in a process in which a television receiver samples an analog video signal from a composite video signal received through a tuner and converts the analog video signal into a digital video signal. Calculating a deviation of sampling values of the video signal generated and sampled for a predetermined time; A second step of increasing or decreasing a phase of an image signal within a range of a predetermined maximum phase value and a predetermined minimum phase value as the interrupt is generated; A third step of sampling the video signal of increasing or decreasing the phase and calculating deviations of sampling values of the video signal sampled for a predetermined time; And determining whether to reduce the phase of the video signal according to the difference between the deviation of the sampling values calculated in the first step and the deviation of the sampling values calculated in the third step, and increasing or decreasing the phase in the second step. And after the predetermined reference time elapses, a fourth step is passed to the first step.

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 locking and unlocking according to an embodiment of the present invention.

Referring to FIG. 1, the television receiver 100 of the present invention includes a tuner 101 for receiving a composite video signal transmitted from a broadcasting station and outputting an analog video signal and an audio signal, and a screen for displaying the video signal ( 102, a speaker 103 for outputting an audio signal, an A / D converter 104 for converting an analog video signal output from the tuner 101 into a digital video signal, and an A / D converter 104 The video processing unit 105 makes the digital video signal output from the video signal suitable for the screen 102, and the audio processing unit 106 makes the audio signal output from the tuner 101 into a signal suitable for the speaker 103. And an image output unit 107 for outputting the video signal output from the video processing unit 105 to the screen 102, and an amplifier for amplifying and outputting the audio signal output from the audio processing unit 106 to the speaker 103. 108 The rain.

In addition, the television receiver 100 of the present invention controls the timer 107 for timing the time, the driving of the timer 107, controls the reception and output of the composite video signal, and the timing of the timer 107. And a controller 110 for controlling the A / D converter 104 according to the value and controlling the synchronization of the video signal output from the video processor 105 and the audio signal output from the audio processor 106.

The tuner 101 receives a composite video signal transmitted through a plurality of channels, and outputs a composite video signal of a channel indicated by the controller 110 to output the received channel. In this case, the tuner 101 outputs an analog video signal included in the composite video signal to the A / D converter 104 and outputs an audio signal to the audio processor 106.

The screen 102 is composed of a liquid crystal display (LCD).

The A / D converter 104 samples an analog video signal output from the tuner 101 and converts the analog video signal into a digital video signal, and changes the phase of the video signal under the control of the controller 110.
Here, the phase of the video signal means that when the analog video signal received by the tuner 101 is sampled by the A / D converter, the position level of the sampled analog data becomes the phase of the received video signal. One pixel data is extracted by replacing the level of each sampling position with digital data.

The video processor 105 converts the digital video signal converted by the A / D converter 104 into a signal suitable for the screen 102 under the control of the controller 110 and outputs the signal to the video output unit 108. In particular, since the LCD screen 102 outputs only a video signal having one resolution, the video processor 105 receives a plurality of video signals having a plurality of resolutions. Scaling the video signal input through the) and outputs a video signal having a resolution suitable for the LCD screen (102).

The audio processor 106 converts the voice signal output from the tuner 101 into an electric voice signal suitable for the speaker 103 under the control of the controller 107 and outputs the voice signal to the amplifier 109.

The controller 110 adjusts the phase of the image signal during the digital signal change process in the A / D converter 104, and generates an interrupt for indicating the phase adjustment time of the image signal. The reference time is used to determine the maximum phase value and the minimum phase value used to adjust the phase of the video signal.

The controller 110 generates an interrupt when the time timingd by the timer 109 passes a predetermined reference time and adjusts the phase of the video signal processed by the A / D converter 104.

The process of adjusting the phase of the image signal by the controller 110 having the above function will be described in more detail as follows.

2A and 2B are flowcharts illustrating a method for automatically adjusting phase in a television receiver according to an embodiment of the present invention.

2A and 2B, when the power of the television receiver 100 is turned on and the composite video signal is received through the tuner 101, the controller 110 checks the timing of occurrence of an interrupt. The timer 109 is driven to time the time required for the control. Here, the interrupt informs the time point for adjusting the phase of the video signal in the digital signal change process in the A / D converter 104. That is, the controller 110 generates an interrupt when the time timingd by the timer 109 passes a predetermined reference time and starts adjusting the phase of the video signal in the digital signal change process in the A / D converter 104. do.

In this way, the controller 110 generates an interrupt when the time timingd by the timer 109 passes a predetermined reference time (S201), and when the analog video signal is sampled by the A / D converter 104, sampling is performed. The difference value between adjacently sampled sampling values is continuously obtained by reading the sampling value of the video signal, and the deviation of the sampling values sampled for a preset time is calculated using the obtained sampling difference values (S202).

In addition, the controller 110 determines whether to increase the phase of the image signal sampled by the A / D converter 104 in the '+' direction or the '-' direction (S203). If it is desired to increase in the 'direction, the controller 110 determines whether the phase value of the image signal to be increased in the current' + 'direction is smaller than a predetermined maximum phase value (204).

If the determination result in the determination process (S204) is small, the controller 110 increases the phase of the video signal sampled by the A / D converter 104 in the '+' direction by the phase value to be increased (S205).

If the determination result in the determination process (S204) is greater than or equal to, the control unit 110 reduces the phase of the video signal sampled by the A / D converter 104 by a predetermined minimum phase value (S206).

As a result of the determination in step S203, when it is desired to reduce in the '-' direction, the controller 110 may determine that the phase value of the image signal to be reduced in the current '-' direction is a predetermined minimum phase value (Max Phase). Determine if greater than (207).

If the determination result in the determination process (S207) is large, the control unit 110 reduces the phase of the video signal sampled by the A / D converter 104 in the '-' direction by the phase value to be reduced (S208).

If the determination result in the determination process (S207) is less than or equal to, the control unit 110 increases the phase of the video signal sampled by the A / D converter 104 by a predetermined maximum phase value (S209).

When the phase of the image signal sampled by the A / D converter 104 is increased or decreased through such processes, the controller 110 samples the analog signal according to the changed phase value in the A / D converter 104. The sampling value of the sampled image signal is read out to continuously obtain the difference value of the adjacently sampled sampling values, and the deviation of the sampling values made for a predetermined time is calculated using the obtained sampling difference values (S210).

After calculating the sampling deviation value calculated after the phase change in this way, the controller 110 determines that the sampling deviation value before the phase change calculated in the calculation process S201 is greater than the sampling deviation value before the phase change calculated in the calculation process S210. If it is small (S211), if the determination result is small, that is, if the phase is normally changed, the control unit 110 determines whether the time timingd by the timer 109 has passed a predetermined reference time before the interrupt is generated again. (S212). If the determination result has not passed, the controller 110 maintains a standby state.

As a result of the determination in the determination process S212, when the time timingd by the timer 109 passes the predetermined reference time, the controller 110 proceeds to the interrupt generation process S201.

If the sampling deviation value before the phase change calculated in the determination process S201 in the determination process S211 is greater than or equal to the sampling deviation value before the phase change calculated in the calculation process S210, that is, the phase is incorrectly changed, If an interrupt occurs next, the controller 110 determines a reduced phase value for decreasing the phase in the '-' direction (S213), and proceeds to the determination process (S212).

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, according to the present invention, even if the phase is changed by automatically real-time correcting the phase of the video signal corresponding to the generated deviation, the deviation caused by different levels of the analog data sampling positions of the video signal received by the television receiver is generated. Maintaining a constant phase of always provides a clear image through the screen, thereby increasing the viewer satisfaction.

Claims (10)

In a television receiver for receiving a composite video signal transmitted from a broadcasting station through a tuner and outputs the video signal on the screen, A timer for timing the occurrence of an interrupt; A controller for controlling driving of the timer, controlling reception and output of the composite video signal, and generating an interrupt at the timing to adjust a phase of the received composite video signal; And When the composite video signal is sampled and the phase of the video signal is detected by the position level of the sampled analog data, the phase is increased or decreased according to the level of the sampling position of the detected video signal under the control of the controller. A / D converter Television receiver including. delete The method of claim 1, The control unit performs a phase adjustment process of the composite video signal once each time the interrupt is generated. The method of claim 1, And the control unit adjusts a phase of the composite video signal within a range of a predetermined maximum phase value and a predetermined minimum phase value. In the method of adjusting the phase of the composite video signal in the process of converting the analog video signal from the composite video signal received through the tuner to a digital video signal, A first step of generating an interrupt as a predetermined reference time elapses and calculating a deviation of sampling values of the composite video signal sampled for a predetermined time; A second step of increasing or decreasing the phase of the composite video signal within a range of a predetermined maximum phase value and a predetermined minimum phase value as the interrupt is generated; A third step of sampling the composite video signal having the phase increased or decreased, and calculating deviations of sampling values of the composite video signal sampled for a predetermined time; And It is determined whether to reduce the phase of the composite video signal according to the difference between the deviation of the sampling values calculated in the first step and the deviation of the sampling values calculated in the third step, and the phase is increased or decreased in the second step. A fourth step of proceeding to the first step as the predetermined reference time elapses after Automatic adjustment of the phase in the television receiver comprising a. The method of claim 5, In the first step, the analog image signal outputted from the tuner is continuously sampled, a difference value of sampling values sampled adjacently among sampling values of the sampled composite image signal is obtained, and the predetermined sampling difference values are used. Calculating a deviation of the sampled sampling values for a time of a; The method of claim 5, The second step, Determining whether the phase of the sampled composite video signal is increased in the '+' direction or decreased in the '-' direction; A second step of determining whether the phase value of the composite video signal to be increased in the current '+' direction is smaller than the predetermined maximum phase value when the determination is made to increase in the '+' direction; If the determination result in step 2-2 is small, increasing the phase of the composite video signal sampled by the phase value to be increased in a '+' direction; If the result of the determination in step 2-2 is greater than or equal to, determining the phase of the video signal sampled by the predetermined minimum phase value; As a result of the determination in the step 2-1, if it is determined to decrease in the '-' direction, it is determined whether the phase value of the composite video signal to be reduced in the current '-' direction is larger than the predetermined minimum phase value. Steps 2-5; If the determination result in the step 2-5 is large, reducing the phase of the video signal sampled by the phase value to be reduced in the '-' direction; And If the determination result in the step 2-5 is less than or equal to, the step 2-7 of increasing the phase of the composite video signal sampled by the predetermined maximum phase value Automatic adjustment of the phase in the television receiver comprising a. The method of claim 5, In the third step, continuously sampling the composite video signal having been increased or decreased in phase, obtaining a difference value between adjacent sampling values among sampling values of the sampled composite video signal, and using the obtained sampling difference values. Calculating a deviation of the sampled sampling values for a time of a; The method according to any one of claims 5 to 8, The fourth step, Determining whether the deviation of the sampling values calculated in the first step is smaller than the deviation of the sampling values calculated in the third step; If the determination result in step 4-1 is small, step 4-2 of moving to the first step as the predetermined reference time elapses after the phase is increased or decreased in the second step; And If the determination result in step 4-1 is greater than or equal to, the phase of the composite video signal is determined to be reduced in the '-' direction, and the predetermined reference time elapses after the phase is increased or decreased in the second step. Steps 4-3 to proceed to the first step Automatic adjustment of the phase in the television receiver comprising a. The method of claim 9, In step 4-3, as the predetermined reference time elapses after the phase is increased or decreased in the second step, an interrupt is generated and the phase of the video signal is decreased in the '-' direction by the determined phase value. A method for automatically adjusting phase in a television receiver.

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