KR100429194B1 - Method and apparatus for processing input signal of TV - Google Patents

Abstract

The present invention relates to a TV input signal processing apparatus and method for receiving and processing an external input signal (CVBS / R / L) signal and a DVD signal (Y / Cr / Cb) simultaneously through a single input port. A signal input unit for inputting a / L or Y / Cb / Cr signal, a first filter for extracting a voice signal from an output of the signal input unit, a second filter for extracting a color signal from an output of the signal input unit, A signal level detector for determining whether the output level of the second filter is equal to or greater than a predetermined level, a switching unit for selecting a CVBS or Y signal at the output of the signal input unit, and a mode change according to the output level of the signal level detector And a control unit for controlling the switching unit to output a corresponding signal according to the switched mode. Since the parties have a DVD signals and video signals can be input is effective to minimize the inconvenience to the user to automatically change to the appropriate mode while minimizing the input to detect when the wrong port type.

Description

TV input signal processing apparatus and method {Method and apparatus for processing input signal of TV}

The present invention relates to a TV, and more particularly, to an input signal processing apparatus and method of a TV.

In general, the TV input signal in the form of a three-terminal phone jack is a plurality of CVBS / R / L and Y / Cr / Cb. In order to accommodate all types of external input terminals, a direction to minimize input terminals is required.

Hereinafter, a TV input signal processing apparatus according to the prior art will be described in detail with reference to the accompanying drawings.

1 is a view showing an input signal processing apparatus of a TV according to the prior art.

As shown in FIG. 1, a TV input signal processing apparatus according to the prior art includes a first signal input unit 1 for receiving a video signal or an audio signal, a second signal input unit 7 for receiving a DVD signal, A multiplexer 2 for receiving the output of the first signal input unit 1 and multiplexing the voice signal processor for extracting a voice signal from the output of the multiplexer 2 and outputting the voice signal through the speaker 4; 3), a video signal extractor 5 for extracting a CVBS signal from the output of the multiplexer 2, a CVBS signal extracted from the video signal extractor 5 and the second signal input unit 7; The image processing unit 6 receives the Y / Cr / Cb signal output from the image processing unit as a displayable signal on the screen, and a display unit 8 for displaying the output of the image processing unit 6.

Here, the first signal input unit 1 includes first to third AV input terminals AV1, AV2, and AV3 for receiving a CVBS / R / L signal, and the second signal input unit 7 includes: It consists of a 3rd AV input terminal AV3 and a DVD input terminal DVD.

In addition, CVBS / R / L terminals are respectively connected to the first to third AV input terminals AV1, AV2, and AV3, and Y / Cr / Cb terminals are connected to the DVD input terminal DVD.

The image processor 6 receives a CVBS signal extracted from the image signal extractor 5 and extracts a color signal from the output of the image signal extractor 5 and a notch filter 6a for detecting a color signal. A color signal processor 6b for supplying the signal, a PLL 6c for supplying a synchronization signal to the color signal processor 6b, a delay unit 6d for delaying the output of the color signal processor 6b for a predetermined time, and the color signal. And a multiplier 6e for generating CVBS by multiplying the output of the processor 6b, and a signal detector 6f for detecting the AV input signal or DVD signal.

The input signal processing apparatus of the TV according to the prior art configured as described above, first, the signal receiving the CVBS signal is extracted by filtering the color signal through the notch filter 6a to extract the Y signal, and is input to the color signal processor 6b. The Cr / Cb signal is output through chroma processing.

Meanwhile, in the case of inputting a voice signal, a signal processed by the voice processor 3 is output through the speaker 4 through an amplification process.

As described above, due to the difference in the processing of the Y signal and the CVBS signal, and the difference in signal components such as the Cb / Cr signal and the voice signal, the external terminal must be dualized, and the signal flow and the internal circuit pattern or applied separately. .

As described above, the TV input signal processing apparatus and method according to the prior art separately input an external input signal and a DVD signal into separate ports, and thus, if a user mistakenly inputs a port incorrectly, the user must confirm this several times. There was a problem.

The present invention has been made to solve this problem, it is possible to receive an external input signal (CVBS / R / L) signal and DVD signal (Y / Cr / Cb) at the same time to input and process a TV It is an object of the present invention to provide an input signal processing apparatus and method.

1 is a layout showing an input signal processing apparatus of a TV according to the prior art

2 is a layout showing an input signal processing apparatus of the TV according to the present invention;

3 is a flowchart illustrating a method of processing an input signal of a TV according to the present invention.

Explanation of symbols for main parts of the drawings

10: signal input unit 20: multiplexer

30: first filter (LPF) 40: voice processing unit

50: second filter (HPF) 60: signal level detector

70: color signal processing unit 80: switching unit

90: image processing unit 100: microcomputer

The input signal processing apparatus of the TV according to the present invention for achieving the above object is a signal input unit for inputting a CVBS / R / L or Y / Cb / Cr signal, and a second for extracting a voice signal from the output of the signal input unit; A first filter, a second filter for extracting color signals from the output of the signal input unit, a signal level detector for determining whether the output level of the second filter is greater than or equal to a predetermined level, a CVBS or It includes a switching unit for selecting a Y signal, and a control unit for controlling the mode switching according to the output level of the signal level detection unit, and the control unit for controlling the switching unit to output the corresponding signal according to the switched mode. .

In accordance with another aspect of the present invention, there is provided a method of processing an input signal of a TV according to an output level of a color signal (Cb) (Cr). Determining whether a video signal is input to an input terminal; determining whether a DVD audio signal is input from a corresponding external input terminal according to the presence of the video signal; and if the DVD audio signal is input, And synchronizing and outputting the DVD audio signal in the switched DVD mode.

Hereinafter, an apparatus and method for processing an input signal of a TV according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a view showing the input signal processing apparatus of the TV according to the present invention, Figure 3 is a flow chart showing the input signal processing method of the TV according to the present invention.

As shown in FIG. 2, the TV input signal processing apparatus according to the present invention includes a signal input unit 10 for inputting a CVBS / R / L or Y / Cb / Cr signal, and an output of the signal input unit 10. A multiplexer 20 for multiplexing, a first filter (LPF) 30 for extracting a voice signal from the output of the multiplexer 20, and a voice extracted by the first filter (LPF) 30 A voice processor 40 for processing a signal to be output through a speaker, a second filter (HPF) 50 for extracting a color signal from the output of the multiplexer 20, and the second filter (HPF) ( A signal level detection unit 60 for determining whether the output level of the signal 50 is greater than or equal to a predetermined level, a color signal processing unit 70 for signal processing such that the color signal extracted by the second filter 50 can be displayed on the screen; A switching unit 80 for selecting a desired CVBS or Y signal from the output of the multiplexer 20, and And an image processor 90 for processing a signal selected by the switching unit 80 to be displayed on the screen, and a microcomputer 100 for controlling mode switching according to the output level of the signal level detector 60. .

Herein, the signal input unit 10 may selectively receive a CVBS signal or a luminance (Y) signal, and may selectively receive Cb or R, Cr, or L signals. (13) and (14). In addition, the first filter 30 is a low pass filter (LPF), the second filter 50 is composed of a high pass filter (HPF).

In the TV input signal processing apparatus configured as described above, the audio signal, that is, the signal output to the R / L terminal and the color signal Cr (Cb) have different frequency characteristics, so that the first and second filters 30 and 50 are separated. The audio signal and the color signal Cr (Cr) Cb are respectively separated.

That is, when the input signal is an audio signal, only the video signal of 25 KHz or less may be input through the first filter (LPF) 30. When the input signal is a color signal Cr (Cb), the second filter may be input. Extract through (HPF) (50).

At this time, the signal filtered by the second filter (HPF) 50 is input to the signal level detector 60 to determine whether the signal level is a predetermined level or more and outputs the signal to the microcomputer (100).

When the output level of the second filter 50 is greater than or equal to the predetermined level (0.5), the color filter signals Cb and Cr are recognized, and the microcomputer 100 outputs a signal to switch to the DVD mode.

In addition, when an image signal is input through the signal input unit 10, the image signal is output in the form of a luminance signal Y or a composite image signal CVBS, and the switching unit 80 provides information on whether a signal is input or not. Output to the microcomputer (100).

This TV input signal processing method will be described with reference to FIG. 3. First, it is determined whether the color signal Cr (Cb) is input from the first AV terminal AV1 (S1) (S2).

Then, the output level Vp-p of the color signal Cr (Cb) is detected, and it is determined whether or not the preset level (0.5) or more (S3) (S4).

Subsequently, when the determination result (S4), the output level (Vp-p) of the color signal (Cr) (Cb) is greater than or equal to the predetermined level (0.5), it switches from the AV mode to the DVD mode (S5).

After switching to the DVD mode, it is determined whether a video signal and an audio signal are input from the second AV terminal AV2 (S6 to S9).

Subsequently, when only the audio signal is input from the second AV terminal AV2 without inputting the video signal from the second AV terminal AV2 as a result of the determination (S8) (S9), the second AV terminal AV2 is the DVD audio signal of the first AV terminal AV1. Output to (S10).

In operation S11, it is determined whether the user rejection mode is selected.

Subsequently, when the user rejection mode is selected (S11), the DVD audio signal of the first AV terminal AV1 is switched to be supplied from the second AV terminal AV2 (S12).

On the other hand, if the video signal is input from the second AV terminal AV2 or the audio signal is not input from the second AV terminal AV2, the determination result S8 returns to the routine S6, and returns to the third AV. It is determined whether a video signal and an audio signal are input from the terminal AV3.

In addition, after checking the signal input of the third AV terminal AV3, it is determined whether a video signal is input from the fourth AV terminal AV4 (S13).

Subsequently, if the video signal is not input from the fourth AV terminal AV4, the determination result (S13) determines whether or not the audio signal is input from the fourth AV terminal AV4 (S14).

As a result of the determination (S14), if the audio signal is input from the fourth AV terminal AV4, the audio signal of the first AV terminal AV1 is output (S15).

In operation S16, it is determined whether the user rejection mode is selected.

Subsequently, if the user rejection mode is selected (S16), the audio signal inputted to the fourth AV terminal AV4 is output to the first AV terminal AV1 DVD mode (S17).

On the other hand, the determination result (S13), (S14), (S16), the video signal is input from the fourth AV terminal (AV4), the audio signal is not input from the fourth AV terminal (AV4), or the user rejection mode is selected. If not, error information of the audio signal input is output (S18).

As described above, when the color signals Cb and Cr are input to the first AV terminal AV1, the level of the signal passing through the second filter HPF is detected and the preset level is 0.5 or more. When a signal is input, it switches to the DVD mode and automatically displays the mode change so that the user can recognize the content.

Next, the color signal Cb (Cr) is input to the first AV terminal AV1 in order to check the audio component of the same signal. Therefore, the video signal input is confirmed from the second AV terminal AV2.

This is for the case where there is an external input terminal currently used by the user. If there is a video signal, it is switched to the third AV terminal AV3. If there is no video signal, the audio signal of the second AV terminal AV2 is present. Check.

If the audio signal does not exist in the second AV terminal AV2, the third AV terminal AV3 switches to the third AV terminal AV3 to determine whether or not the video signal of the third AV terminal AV3 exists. If there is a video signal of the terminal AV3, it is determined whether there is an input of a video signal from the fourth AV terminal AV4.

In addition, when a user inputs and uses only an audio signal without inputting a video signal, a user rejection function may be added to check if the video and audio do not match.

The input signal processing apparatus and method of the TV according to the present invention has the following effects.

First, the input signal can be minimized because the DVD signal and the video signal can be input to one terminal for the continuously increasing external input signal receiving terminal.

Second, even if the DVD jack is connected to the R / L terminal, the mode change is possible by detecting and switching the DVD input signal.

Third, since an external input signal and a DVD signal can be received through one terminal, the circuit can be simplified.

Claims (5)

A signal input unit for inputting a CVBS / R / L or Y / Cb / Cr signal; A first filter for extracting a voice signal from an output of the signal input unit; A second filter for extracting a color signal from an output of the signal input unit; A signal level detector for determining whether an output level of the second filter is greater than or equal to a predetermined level; A switching unit for selecting a CVBS or Y signal at an output of the signal input unit; And, And a controller for controlling mode switching according to the output level of the signal level detector and controlling the switching unit to output a corresponding signal according to the switched mode. The method of claim 1, And the first filter is a low pass filter, and the second filter is a high pass filter. Determining whether the DVD mode is switched according to the output level of the color signals Cb and Cr; Determining whether an input of a video signal is present at an external input terminal except for the terminal switched to the DVD mode; Determining whether a DVD audio signal is input from a corresponding external input terminal according to the presence of the video signal; And, And if the DVD audio signal is input, synchronizing and outputting the DVD audio signal to the switched DVD mode. The method of claim 3, wherein Determining whether the DVD mode is switched And if the signal level of the color signal (Cb) (Cr) is greater than or equal to a predetermined level, switching from the AV mode to the DVD mode. The method of claim 3, wherein If there is a video signal in a terminal other than the terminal switched to the DVD mode And outputting a voice signal error to all of the corresponding terminals.