KR20100025692A - Apparatus and method for multi-detection of color burst - Google Patents

Apparatus and method for multi-detection of color burst Download PDF

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Publication number
KR20100025692A
KR20100025692A KR1020080084341A KR20080084341A KR20100025692A KR 20100025692 A KR20100025692 A KR 20100025692A KR 1020080084341 A KR1020080084341 A KR 1020080084341A KR 20080084341 A KR20080084341 A KR 20080084341A KR 20100025692 A KR20100025692 A KR 20100025692A
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KR
South Korea
Prior art keywords
color
burst
color burst
signal
level
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Application number
KR1020080084341A
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Korean (ko)
Inventor
박효민
Original Assignee
엘지전자 주식회사
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Application filed by 엘지전자 주식회사 filed Critical 엘지전자 주식회사
Priority to KR1020080084341A priority Critical patent/KR20100025692A/en
Publication of KR20100025692A publication Critical patent/KR20100025692A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/44—Colour synchronisation
    • H04N9/455—Generation of colour burst signals; Insertion of colour burst signals in colour picture signals or separation of colour burst signals from colour picture signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/64—Circuits for processing colour signals

Abstract

PURPOSE: A signal processing device with a color burst multi detection function and a method thereof are provided to demodulate a color even about an abnormal signal in which a burst level is not uniform. CONSTITUTION: A delay unit(22) delays a detected horizontal synchronization signal during a fixed time. A color burst detecting unit(23) sets at least one color burst detection point into which a backporch section of the detected horizontal synchronization signal is inserted. The color burst detecting unit detects a color burst whose color burst level is bigger than a threshold level. A color demodulating unit(25) separates a carrier color signal based on the detected color burst to detect a color difference signal.

Description

Apparatus and method for multi-detection of color burst}

The present invention relates to a signal processing apparatus and method having a color burst multi-detection function, and more particularly, to a signal processing device having a color burst multi-detection function by multiplexing a detection interval for a color burst signal which is a reference signal of a color signal; It is about a method.

In general, all analog TV receivers detect a color burst signal to determine whether there is a color on that channel depending on the level of the burst signal. However, in case of an abnormal signal, there is a difference in level depending on the interval of the burst signal, so that the level of the detection interval is only small, which causes a problem of no color, which is a problem of IC setting and cannot be solved at each service center. It is a problem. In the prior art, the IC maker (Maker) is configured to fix the detection point (Fix), so the above problems occur. Conventional techniques for detecting burst signals include various cases of determining a certain period from the horizontal synchronous signal (H-sync) and determining a few cycles after the start of the burst signal.

1B is an exemplary view showing a conventional color burst detection point. The color burst is a sine wave pulse corresponding to a color carrier frequency (3.58 MHz) as a component having several periods carried in a color signal of an image signal. Color bursts are used as reference signals when reproducing color signal components. As shown in FIG. 1B, since the conventional burst detection point is fixed to one center X of the color burst section, the burst point is detected as no color at the center point X having a low burst level. .

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to enable color demodulation even for an abnormal signal whose burst level is not constant by plurally detecting color bursts.

According to an aspect of the present invention, there is provided a signal processing apparatus having a color burst multi-detection function, including: a video signal processor extracting a carrier color signal and a color burst signal component included in an applied composite video signal to remove a DC component; A synchronization signal detector for detecting a horizontal synchronization signal of the composite video signal; A delay unit for delaying and outputting the detected horizontal synchronization signal for a predetermined time period; At least one color burst detection point inserted in a backporch section of the detected horizontal pottery signal is set in the output carrier color signal and color burst signal component to detect a color burst whose color burst level is greater than a threshold level. A color burst detection unit; And a color demodulator for separating the carrier color signal based on the detected color burst to detect a color difference signal.

The color burst detection unit sets the time from the horizontal synchronization signal to the color burst center as a color burst detection point as a reference.

When the detected burst level is less than the threshold level, the color burst detector sets a plurality of burst detection points which are delayed or delayed by a predetermined time from the reference color burst detection point.

The color burst detection unit stores the color burst detection point when the detected burst level is greater than a threshold level.

The color burst threshold level is 0.3V.

In addition, the present invention provides a color burst multi-detection method of a signal processing apparatus, comprising: setting a color burst detection point as a reference; Comparing the burst level detected at the set color burst detection point with a threshold level; Storing the color burst detection point and setting a plurality of color burst detection points based on the comparison result; And modulating a color signal based on the detected burst level.

And when the detected burst level is greater than a threshold level, storing the color burst detection point.

If the detected burst level is less than the threshold level, the method may further include setting a plurality of burst detection points which are delayed or delayed a predetermined time from the reference color burst detection point.

The setting of the plurality of burst detection points may be performed until the detected burst level is greater than a threshold level.

The color burst threshold level is 0.3V.

The present invention provides multiple demodulation periods of color bursts to demodulate a color even for an abnormal signal whose level is not constant.

The objects, features and advantages of the present invention will be more readily understood by reference to the accompanying drawings and the following detailed description. In describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the description thereof will be omitted.

1A is an exemplary diagram illustrating a general color burst output screen.

The Color Burst signal detects the color carrier on the receiver side so that the frequency and phase of the subcarrier on the transmitter side can match the local oscillation frequency and phase on the receiver side for accurate R, G, B processing. It is a signal inserted in the back porch of each horizontal synchronization signal in the composite video signal. The color burst is located in the part of the back porch following horizontal synchronization with the video signal.

2 is a block diagram of a signal processing apparatus having a color burst detection function according to the present invention.

The video signal processor 20 extracts a 3 to 4 MHz signal, that is, a carrier color signal and a color burst signal component included in the applied composite video signal, and removes and outputs a DC component.

The sync signal detector 21 detects a horizontal sync signal of the composite video signal to be applied. The delay unit 22 delays and outputs the detected horizontal synchronization signal for a predetermined time.

In order to extract the color burst signal inserted in the back porch section of the horizontal synchronization signal from the carrier color signal and the color burst signal component, the color burst detection unit 23 has a predetermined pulse voltage of a delayed signal (burst gate pulse). The color burst signal is extracted by allowing the collector current to flow only during the period applied to the base of the. In particular, the color burst detection unit 23 according to the present invention multiplexes the color burst detection section. In this case, the plurality of detection sections include a center (X) detection point of the color burst signal section, a -Z moving detection point from the center (X) detection point, and a + Z moving detection point from the center (X) detection point.

The band amplifier 24 separates the carrier color signal from the carrier color signal and the color burst signal component to amplify and output the carrier color signal.

The color demodulator 25 synchronously detects and outputs the color difference signals R-Y, G-Y, and B-Y using the subcarriers from the color synchronizer in the carrier color signal from the band amplifying section 24.

3 is an exemplary view showing a color burst detection point according to an embodiment of the present invention.

For accurate color in the video signal, the color sync signal has 8 to 11 periodic burst locks of the 3.58 MHz subcarrier signal on the backporch of each horizontal blanking pulse.

At this time, a burst signal of a predetermined level (0.3V) or more is detected from a plurality of detection points D1, D2, and D3 in a color burst signal section and demodulated into a color signal.

4 is a flowchart illustrating a color burst detection method according to the present invention.

The color burst detection point A1 as a reference is set (S41). At this time, A1 is the time from the horizontal synchronization signal to the center X of the color burst signal.

When the burst level value is greater than the threshold level Y detected at the A1 site, the detection interval point A1 is stored in the corresponding channel (S42 and S47). At this time, the burst level threshold Y is set to 300 mV.

When the burst level value detected at the A1 point is smaller than the threshold Y, the burst detection point A2 is set as early as a predetermined time Z at the color burst detection point A1 as a reference (S43).

When the burst level value is greater than the burst level value detected at the A2 point, the detection point A2 is stored in the corresponding channel (S44, S47).

When the burst level value detected at the A2 point is smaller than the threshold Y, the burst detection point A3 delayed by a predetermined time Z is set at the reference color burst detection point A1 (S45).

When the detected burst level value is larger than the threshold level Y detected at the point A3, the detection point A3 is stored in the corresponding channel (S46 and S47).

By pluralizing A1, A2, A3 without fixing the burst detection interval, the no color problem for the signal is solved by adding a simple algorithm at no additional cost.

On the other hand, the terms used in the present invention (terminology) are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of the skilled person in the relevant field, the definitions of which are used throughout the present invention. It should be based on.

The present invention is not limited to the above-described embodiments and may be variously modified and changed by those skilled in the art, which are included in the spirit and scope of the present invention as defined in the appended claims.

1A is an exemplary view showing a general color burst output screen.

Figure 1b is an illustration showing a conventional color burst detection point

2 is a block diagram of a signal processing apparatus having a color burst detection function according to the present invention;

3 is an exemplary view showing a color burst detection point according to an embodiment of the present invention.

4 is a flowchart illustrating a color burst detection method according to the present invention.

* Description of the symbols for the main parts of the drawings *

20. Video signal processor 21. Sync signal detector

22. Delay unit 23. Color burst detection unit

24. Band amplification section 25. Color demodulation section

Claims (10)

Setting a color burst detection point as a reference; Comparing the burst level detected at the set color burst detection point with a threshold level; Storing the color burst detection point and setting a plurality of color burst detection points based on the comparison result; And And modulating a color signal based on the detected burst level. The method of claim 1, And when the detected burst level is greater than a threshold level, storing the color burst detection point. The method of claim 1, And setting a plurality of burst detection points that are delayed or delayed a predetermined time from the reference color burst detection point when the detected burst level is smaller than a threshold level. The method of claim 3, wherein The setting of the plurality of burst detection points is performed until the detected burst level is greater than the threshold level. The method of claim 1, And the color burst threshold level is 0.3V. A video signal processor extracting a carrier color signal and a color burst signal component included in an applied composite video signal, and removing and outputting a DC component; A synchronization signal detector for detecting a horizontal synchronization signal of the composite video signal; A delay unit for delaying and outputting the detected horizontal synchronization signal for a predetermined time period; At least one color burst detection point inserted in a backporch section of the detected horizontal pottery signal is set in the output carrier color signal and color burst signal component to detect a color burst whose color burst level is greater than a threshold level. A color burst detection unit; And And a color demodulator for separating the carrier color signal based on the detected color burst to detect a color difference signal. The method of claim 6, And the color burst detection unit sets the time from the horizontal synchronization signal to the color burst center as a color burst detection point as a reference. The method of claim 6, When the detected burst level is less than a threshold level, the color burst detection unit sets a plurality of burst detection points that are delayed or delayed a predetermined time from a reference color burst detection point. Signal processing device. The method of claim 6, And the color burst detection unit stores the color burst detection point when the detected burst level is greater than a threshold level. The method of claim 6, And said color burst threshold level is 0.3 volt.
KR1020080084341A 2008-08-28 2008-08-28 Apparatus and method for multi-detection of color burst KR20100025692A (en)

Priority Applications (1)

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KR1020080084341A KR20100025692A (en) 2008-08-28 2008-08-28 Apparatus and method for multi-detection of color burst

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020080084341A KR20100025692A (en) 2008-08-28 2008-08-28 Apparatus and method for multi-detection of color burst

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KR20100025692A true KR20100025692A (en) 2010-03-10

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