KR100235349B1 - Color signal converting apparatus of television - Google Patents

Abstract

The present invention relates to a color signal converting apparatus of a television which is capable of adaptively converting a color difference signal of an HDTV video signal or a color signal of an NTSC video signal to an RGB signal in an HDTV or a general television. The first path for processing the RY signal among the color signals separated from the input video signal when the signal is a video signal of a general TV, the P _r signal among the color difference signals separated from the input video signal when the input video signal is a video signal of the HDTV. And a switching means for selecting the first path or the second path in response to the detection result of the second path and the input video signal, and provided through the luminance signal separated from the input video signal and the first path or the second path. R signal generating means for generating an R signal on the basis of the RY signal or the P _r signal; When the input video signal is a video signal of a normal TV, when the third path, the input video signal is a video signal of the HDTV for processing a color signal of the BY signal separated from the input video signal, separating the chrominance in the input video signal sinhojung P _b signal And a switching means for selecting a third path or a fourth path in response to a fourth path for processing a signal and a detection result of the input video signal, wherein the luminance signal and the third path or the fourth path separated from the input video signal are separated. B signal generating means for generating a B signal based on the BY signal or the P _b signal provided through; And a fifth path for processing the RY signal and the BY signal of the color signal separated from the input video signal when the input video signal is a video signal of a general TV, and separated from the input video signal when the input video signal is the video signal of HDTV. Switching means for selecting a fifth path or a sixth path in response to detection results of a sixth path and an input video signal for processing the P _r signal and the P _b signal of the color difference signal, respectively; And a G signal generating means for generating a G signal based on the RY signal and the BY signal or the P _r signal and the P _b signal provided through the luminance signal and the fifth or sixth path.

Description

TV's color signal converter

The present invention relates to an apparatus for converting a color signal of a video signal received by a television into an RGB signal, and more particularly, a color difference signal (P _b) of an HDTV video signal having a different format in a high-definition television (HDTV) or a general television. , P _r ) or a color signal converter of a television suitable for adaptively converting color signals (RY, BY) of an NTSC video signal into an RGB signal.

Recently, since the development of technology related to HDTV which has enhanced the quality of general TVs has been accelerated, commercial products are being released everywhere. Considering the transitional current situation in which ordinary TVs and HDTVs can coexist, The compatibility problem of receiving and displaying HDTV broadcast signals and receiving and displaying general TV broadcast signals (for example, NTSC broadcast signals) on an HDTV should be solved as a first priority. Therefore, if this compatibility problem is not solved, this will be a major obstacle to the expansion of HDTV.

Therefore, studies to secure compatibility between HDTV and general TV are still being conducted everywhere. To maintain such compatibility, HDTV is not only HDTV broadcasting signal but also general TV broadcasting signal (for example, NTSC broadcasting signal). Etc.) and a circuit capable of receiving and decoding the color signal RY and BY of the decoded general TV video signal to an RGB signal, on the contrary, the general TV is not only HDTV broadcasting but also general TV broadcasting signal. by receiving the signal can be decoded and will also be provided with a to convert the color difference signal (P _b, P _r) of a decoded HDTV video signal into an RGB signal circuit.

Here, the present invention converts not only the color difference signals (P _b , P _r ) of the HDTV video signals in HDTVs, but also the color signals (RY, BY) of general TV video signals (eg, NTSC video signals, etc.) to RGB signals. In addition, the present invention relates to a technique capable of converting not only color signals RY and BY of general TV video signals, but also color difference signals P _b and P _r of HDTV video signals to RGB signals.

Accordingly, the present invention has been made in view of the above, and a color signal conversion apparatus of a television capable of adaptively converting a color difference signal of an HDTV video signal or a color signal of an NTSC video signal to an RGB signal in an HDTV or a general TV The purpose is to provide.

To achieve the above object, the present invention detects whether an input video signal is a video signal of an HDTV or a video signal of a general TV, and adaptively converts a color signal separated from the input video signal into an RGB signal based on the detection result. A color signal converting apparatus of a television for converting, the first path for processing an RY signal of color signals separated from the input video signal when the input video signal is a video signal of the general TV, and the input video signal is the HDTV. A second path for processing the P _r signal among the color difference signals separated from the input video signal, and a switching means for selecting the first path or the second path in response to a detection result of the input video signal when the video signal is a? And through the luminance signal separated from the input video signal and the first path or the second path. R signal generating means for generating the R signal on the basis of the RY signal or the P _r signal provided; A third path for processing a BY signal among color signals separated from the input video signal when the input video signal is a video signal of the general TV, and separated from the input video signal when the input video signal is a video signal of the HDTV a color difference sinhojung fourth path and in response to the detection result of the third path, or provided with a switching means for selecting a fourth path, a luminance signal separated from the input video signal of the input video signal for processing the P _b signal B signal generating means for generating the B signal based on the BY signal or the P _b signal provided through the third path or the fourth path; And a fifth path for processing the RY signal and the BY signal of the color signal separated from the input video signal when the input video signal is a video signal of the general TV, when the input video signal is a video signal of the HDTV, Switching means for selecting the fifth path or the sixth path in response to a detection result of the input video signal and a sixth path for processing the P _r and P _b signals of the color difference signal separated from the input video signal, respectively; And a G signal that generates the G signal based on the luminance signal separated from the input video signal and the RY and BY signals or the P _r and P _b signals provided through the fifth path or the sixth path. Provided is a color signal converting apparatus for a television composed of generating means.

1 is a schematic block diagram of a typical television color processing system suitable for applying a color signal conversion apparatus according to the present invention;

2 is a block diagram of a color signal conversion apparatus of a television according to a preferred embodiment of the present invention;

3 is a circuit diagram of the R signal and B signal converter shown in FIG.

4 is a circuit diagram of the G signal converter shown in FIG.

<Description of the code | symbol about the principal part of drawing>

102: Y / C separator 104: color signal judgment block

106: controller 108: matrix block

202: R signal converter 204: G signal converter

206: B signal converter 302,402: operational amplifier

The above and other objects and various advantages of the present invention will become more apparent from the preferred embodiments of the present invention described below with reference to the accompanying drawings by those skilled in the art.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As is well known, Y, RY and BY signals, which are matrix formats of NTSC video signals, have a matrix as shown in Equation 1 below, and Y, P _b , and P _r signals, which are matrix formats of HDTV video signals, Have the same matrix.

[Equation 1]

Y = 0.59G + 0.11B + 0.30R

B-Y = = 0.59G + 0.89B -0.30R

R-Y = -0.59G -0.11B + 0.70R

[Formula 2]

Y = 0.701 G + 0.087 B + 0.212 R

B-Y = -0.701G + 0.913B -0.212R

R-Y = -0.701G -0.087B + 0.788R

P _b = (BY) /1.826

P _r = (RY / 1.576)

That is, as can be seen from the above equation, the NTSC video signal and the HDTV video signal have different matrix formats.

Accordingly, in the present invention, based on the detection result of detecting whether the input signal is the color difference signal (P _b , P _r ) of the HDTV video signal or the color signal (RY, BY) of the NTSC video signal, different matrix formats as described above are used. Adopts technical means for adaptively converting two signals (color difference signal (P _b , P _r ) of HDTV video signal or color signal (RY, BY) of NTSC video signal) to RGB signal using one circuit based on do.

Here, the color signal C is defined as a generic term for the color difference signals P _b and P _r and the color signals RY and BY for the convenience of explanation and improvement of understanding.

Figure 1 shows a schematic block diagram of a typical television color processing system suitable for applying the color signal conversion apparatus according to the present invention.

As shown in the figure, a typical television color processing system includes a luminance signal / color signal (Y / C) separator 102, a color signal determination block 104, a controller 106 and a matrix block 108. .

Referring to FIG. 1, the Y / C separator 102 separates a luminance signal Y and a color signal C from a complex television signal input using, for example, a filtering technique, and the separated luminance signal. (Y) is provided to the matrix block 108 related to the present invention via line L11, and the separated color signal C is provided to the matrix block 108 and the color signal determination block 104 via the line L13, respectively. do.

At this time, the color signal C on the line L13 output from the Y / C separator 102 will be the color difference signal P _b , P _r when the input signal is an HDTV video signal, and the input signal is a general TV video signal ( For example, it will be a color signal (RY, BY) when it is an NTSC video signal.

Next, in the color signal determination block 104, the peak-to-peak voltage V _PP level of the color signal C provided by the Y / C separator 109 through the line L13 and the controller 106 to be described later. Based on the reference voltage Vref provided through the line L15, it is determined whether the input color signal is the color difference signal (P _b , P _r ) of the HDTV video signal or the color signal (RY, BY) of the NTSC video signal. A high or low level logic signal corresponding to the result is generated and provided to the controller 106 via line L17. As an example of such a color signal determination block 104, there is disclosed a "color signal discrimination apparatus in high-definition television" filed by the present applicant with the present invention to the Korean Intellectual Property Office.

On the other hand, the controller 106 is, for example, a microprocessor that performs the operation control of each component when processing a signal (video signal, audio signal, etc.) received from a general TV or HDTV receiver, the detected peak-to-peak Based on the comparison result between the voltage V _PP and the preset reference voltage Vref, the current input signal is the NTSC color signal (RY, BY) based on the logic signal of the high or low level provided from the color signal determination block 104 described above. It determines whether or not the color difference signal (P _b , P _r ) of the HDTV. Based on the determination result, a control signal CS for selecting a signal conversion path is determined and provided to the matrix block 108 through the line L19. . For example, the controller 106 generates a low level control signal CS on line L19 when the input signal is a color signal of an NTSC signal, and a high level on line L19 when the input signal is a color difference signal of an HDTV signal. The control signal CS may be generated.

On the other hand, the matrix block 108 is a part directly related to the present invention, and the luminance signal Y on the line L11 is based on the control signal CS provided from the controller 106 described above via the line L19. and by creating a RGB signal through the matrix conversion based on (the color signal of the color difference signal of the HDTV (P _b, P _r) or NTSC (RY, bY)) line color signal on L13, in this matrix block 108 The color conversion process will be described in detail below with reference to FIGS. 2, 3, and 4 showing the specific configuration thereof.

2 is a block diagram of a color signal conversion apparatus of a television according to a preferred embodiment of the present invention.

As shown in the figure, the color signal conversion device of the present invention can be regarded as similar to the configuration of a typical conventional color signal conversion device from the viewpoint of having three color signal converters 202, 204, and 206, but FIGS. As shown in FIG. 2, each color signal converter 202, 204, 206 has at least two signal conversion paths (i.e., a path for color signal processing of NTSC and a color difference signal processing of HDTV). The difference is achieved by the object of the present invention.

2, the R signal converter 202 converts the luminance signal Y on the line L11 and the color signal on the line L13 (RY signal of NTSC or P _{r of} HDTV) based on the control signal CS on the line L19. The B signal converter 202 also generates a luminance signal Y on line L11 and a color signal on line L13 (BY signal of NTSC or P _{b of} HDTV) based on control signal CS on line L19. To generate the B signal.

As an example, as shown in FIG. 3, the R signal converter 202 and the B signal converter 204 may be configured using a plurality of resistors, a transistor TR1, and an operational amplifier 302. That is, the ground potential and its output which are fed back are connected to the inverting terminal (-) of the operational amplifier 302, and the luminance signal Y and the color signal RY, BY or P _r , P are connected to the non-inverting terminal (+) thereof. _b ) are commonly connected, and in particular, two signal conversion paths a0 and b0 are formed in the connection line of the color signal, as indicated by the arrows in the same figure. At this time, two resistors R31 and R32 are gain adjusting resistors of the operational amplifier 302. As the operational amplifier 302, for example, a wideband operational amplifier having a bandwidth of 140 MHz at a gain G = + 2 and a bandwidth of 120 MHz at a gain G = + 1 can be used.

Here, one signal conversion path a0 formed between the collector-emitter and the resistor R35 of the transistor TR1 is a path for processing the color difference signal P _r or P _b of the HDTV, and the two connected in series The other signal conversion path b0 formed of the resistors R34 and R35 is a path for processing the NTSC color signal RY or BY.

Therefore, when the input signal is an NTSC signal, the transistor TR1 connecting the low level control signal CS to its base terminal is turned off, so that the color signal RY or BY of the NTSC is connected to the line L11 through the signal conversion path b0. When the transistor TR1 is coupled to the luminance signal Y of the image and the input signal is an HDTV signal, the transistor TR1 to which the high level control signal CS is connected to its base terminal is turned on, so that the color difference signal P _r or P _{b of the} HDTV is turned on. Will be combined with the luminance signal Y on the line L11 via the signal conversion path a0.

As an example, assuming that the input signal is a color difference signal of the HDTV and the circuit shown in Fig. 3 is a B signal converter, as can be seen from the above equation, P _b becomes 0.548 (BY), so Y _V : P _bV = 1 becomes 0.548. At this time, since equalize the level of the voltage ratio between Y and Y to P _b P _b is the yeokbi of 0.548: 1 will have to be.

In addition, since the level of Y and BY corresponds to 1: 1 when the input signal is a color signal of NTSC, for example, when the resistor R33 is used as 1.8K, the resistor R35 is approximately 1K and the resistor R34 is. You can use 0.8 K.

Therefore, in the present embodiment, as described above, two signal conversion paths a0 and b0 for color signal processing and switching means (transistor TR1) for switching the two signal conversion paths a and b are used. the circuit configuration through use of a luminance signal (Y) and HDTV or P _r P _b RY or bY signals of the NTSC signal and the color signal of the color difference signal can generate an R signal or the B signal of the image adaptively.

Referring back to FIG. 2, the G signal converter 206 is based on the control signal CS on the line L19 and the luminance signal Y on the line L11 and the color signal on the line L13 (RY and BY signals of NTSC or P of HDTV). Generating a G signal using _r and P _b ), such a G signal converter 206 may include a plurality of resistors, two transistors TR2 and TR3 and an operational amplifier (for example, as shown in FIG. 4). 402 may be used. Here, as the operational amplifier 402, as in the R signal converter and the B signal converter described above, for example, a wideband operation having a bandwidth of gain G = + 2 at 140 MHz and a bandwidth of gain G = + 1 at 120 MHz An amplifier can be used.

That is, the luminance signal Y on the line L11 is connected to the non-inverting terminal + of the operational amplifier 402 through the resistor R41, and the control signal CS is connected to the inverting terminal thereof through the resistor R47. ), RY or P _r and BY or P _b are commonly connected. At least one signal conversion path is connected to each input line of the RY or P _r and BY or P _b signals through one transistor TR2 or TR3. Two signal conversion paths (a, b and a ', b') are formed, respectively. Here, each base terminal of the two transistors TR2 and TR3 is connected to the control signal CS on the line L19 in common. In this case, the transistor TR2 is of the PNP type and the transistor TR3 is of the NPN type. In other words, when the high or low level control signal CS is input to the base terminal, an alternate on / off operation is performed.

Referring to FIG. 4, one of the two signal conversion paths a and b for inputting the RY or P _r signal is formed between the resistor R43 and the collector-emitter of the transistor TR2. It is a path for NTSC's RY signal processing (that is, a path formed by applying the low level control signal CS and the transistor TR2 is turned on), and the other of the two resistors R43 and R44 connected in series. The signal conversion path b is a path for processing the P _r signal of the HDTV (that is, a path formed by applying the high level control signal CS and turning off the transistor TR2).

In addition, one signal conversion path (a ') formed between the collector (R') and the collector-emitter of the transistor (TR3) of the two signal conversion paths (a ', b') inputting the BY or P _b signal is HDTV. _Pb signal processing path (that is, a path formed by applying the high level control signal CS and the transistor TR3 is turned on), and the other of the two resistors R46 and R45 connected in series. The signal conversion path b 'is a path for processing the BY signal of the NTSC (that is, a path formed by applying the low-level control signal CS and turning off the transistor TR3).

Therefore, assuming that the input signal is the color difference signal of the HDTV, the circuit of FIG. 4 is summarized, and the voltage V = 0.124 (BY) + 0.302 (RY) at the resistor R47 which is the point where the P _r and P _b signals are mixed. , because it is _{P b = 0.548 (BY),} P r = 0.635 (RY), V = 0.226P is a _b + 0.476P _r. Therefore, the resistance ratio when P _b : P _r = 0.226: 0.476, that is, the resistance ratio between the resistors R46 and the two resistors R43 and R44 is about 4425: 2101, that is, about 4.5: 2. Similarly, assuming that the input signal is a color signal of NTSC, BY: RY = 0.124: 0.302, so the resistance ratio between resistor R43 and two resistors R45, R46 is 8065: 3311, that is, about 8: 3. do.

Therefore, it is possible to adaptively generate the G signal from the color difference signal or the NTSC color signal of HDTV by setting the resistance value of each signal conversion path (a, b and a ＇, b＇) so that this condition can be satisfied. will be.

That is, in the generation of the G signal, when the input signal is the color signal of NTSC, that is, when the control signal CS is at the low level, the RY signal and the signal conversion path b 'provided through the signal conversion path a are changed. By mixing the BY signal provided through the signal, it is possible to generate a G signal in the NTSC video signal, and through the signal conversion path (b) when the input signal is a color difference signal of the HDTV, that is, when the control signal CS is at a high level. By mixing the provided P _r signal and the P _b signal provided through the signal conversion path a ', a G signal in the HDTV video signal can be generated.

On the other hand, in the embodiment of the present invention as described above has been described as using a transistor as a switching means for switching each of the two signal conversion paths provided in each signal converter (RGB signal converter) of the matrix, but is not necessarily limited thereto. It will be appreciated by those skilled in the art that simple modifications or variations of the present invention may be employed to compose and employ devices other than transistors.

As described above, according to the present invention, two signal conversion paths (NTSC color signal path and HDTV color difference) which differ in their combined resistance ratios in each signal converter (RGB signal converter) in a matrix circuit for converting color signals to RGB signals. Signal path) and adaptively set one of the two paths for each signal converter based on the color signal determination result of the input signal, so that not only the color difference signal of the HDTV video signal but also the color signal of the NTSC video signal can be obtained. Adaptive conversion to RGB signals ensures compatibility between HDTV video signals and regular TV video signals.

Claims (13)

In a color signal converter of a television for detecting whether the input video signal is a video signal of an HDTV or a video signal of a general TV, and adaptively converts a color signal separated from the input video signal into an RGB signal based on the detection result. , A first path for processing an RY signal among color signals separated from the input video signal when the input video signal is a video signal of the general TV, and separated from the input video signal when the input video signal is a video signal of the HDTV A second path for processing a P _r signal among one color difference signal and switching means for selecting the first path or the second path in response to a detection result of the input video signal, the luminance signal separated from the input video signal R signal generating means for generating the R signal based on the RY signal or the P _r signal provided through the first path or the second path; A third path for processing a BY signal among color signals separated from the input video signal when the input video signal is a video signal of the general TV, and separated from the input video signal when the input video signal is a video signal of the HDTV a color difference sinhojung fourth path and in response to the detection result of the third path, or provided with a switching means for selecting a fourth path, a luminance signal separated from the input video signal of the input video signal for processing the P _b signal B signal generating means for generating the B signal based on the BY signal or the P _b signal provided through the third path or the fourth path; And A fifth path for processing the RY signal and the BY signal of the color signal separated from the input video signal when the input video signal is a video signal of the general TV, and when the input video signal is a video signal of the HDTV, And a sixth path for processing the P _r signal and the P _b signal of the color difference signal separated from the input video signal, and switching means for selecting the fifth path or the sixth path in response to the detection result of the input video signal. And generating a G signal based on the luminance signal separated from the input video signal and the RY and BY signals or the P _r and P _b signals provided through the fifth path or the sixth path. A color signal converter of a television made up of a means. The apparatus of claim 1, wherein the general TV video signal is an NTSC video signal. 3. The signal generating apparatus according to claim 1 or 2, wherein each of the R signal generating means and the B signal generating means has a predetermined predetermined resistance value and transmits any one of the color signals separated from the video signal of the general TV. A first pass; A second pass having a different resistance value at least smaller than the synthesized resistance value and transferring any one of the color difference signals separated from the video signal of the HDTV; The switching means for switching the selection of the first pass or the second pass based on a detection result of the input video signal; And An operational amplifier having a ground potential connected to an inverting terminal and a feedback output thereof, and an op amp connected to a non-inverting terminal connected to a signal in which the luminance signal separated from the input video signal and the output of the first pass or the second pass are connected. TV color signal converter. 4. The color signal conversion apparatus of claim 3, wherein the first pass comprises two resistors connected in series. 5. The color signal converting apparatus of claim 4, wherein the second pass comprises a signal path of the switching means and one of the two resistors. 6. The color signal converter of claim 5, wherein the switching means comprises a transistor. 3. The apparatus of claim 1 or 2, wherein the G signal generating means comprises: a third pass having a predetermined first resistance value and transferring an RY signal of the color signals separated from the video signal of the general TV; A fourth pass having a first composite resistance value greater than the first resistance value and transferring a P _r signal of the color difference signals separated from the video signal of the HDTV; A first switch for switching the selection of the third pass or the fourth pass based on a detection result of the input video signal; A fifth pass having a predetermined second synthesized resistance value and transferring a BY signal among the color signals separated from the video signal of the general TV; A sixth pass having a second resistance value at least less than the second synthesis resistance value and transferring a P _b signal of the color difference signals separated from the video signal of the HDTV; A second switch for switching the selection of the fifth pass or the sixth pass based on a detection result of the input video signal; And a non-inverting terminal connected with the luminance signal separated from the input video signal, and an inverting terminal connected with a signal obtained by mixing the output of the third or fourth pass with the output of the fifth or sixth pass. Color signal converter of the television, characterized in that consisting of an amplifier. The apparatus of claim 7, wherein the fourth pass comprises two resistors connected in series. The apparatus of claim 8, wherein the third pass comprises a signal path of the first switch and one of the two resistors. 10. The color signal converter of claim 9, wherein the first switch comprises a transistor. 8. The color signal converter of claim 7, wherein the fifth pass comprises two resistors connected in series. 12. The color signal converting apparatus of claim 11, wherein the sixth pass comprises a signal path of the second switch and one of the two resistors. 13. The color signal conversion apparatus for a television according to claim 12, wherein said second switch is composed of a transistor.

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