KR20040069734A - Input Signal Control Apparatus - Google Patents

Abstract

PURPOSE: An input signal switching device is provided to automatically switch only a video signal of a jack to which normal signals are input whenever an external input signal switching key is input. CONSTITUTION: An input signal switching device includes external input video jack ports, a connection determining unit(220), a signal determining unit(230), and a controller(20). The connection determining unit detects whether the video jack ports are respectively connected to external input jacks and transmits the detected result. The signal determining unit determines whether a signal output from the connection determining unit is normal or not and transmits the determined result to the controller. The controller selects an image of a port to which a normal signal is input based on the detected result transmitted from the connection determining unit and the determined result transmitted from the signal determining unit and displays the image on a display device.

Description

Input Signal Switching Device {Input Signal Control Apparatus}

The present invention relates to an input signal switching device of a video input jack to automatically recognize the connection state of a plurality of video jacks and to automatically switch only the port where the image is connected to the current jack.

Generally, a TV for receiving and watching a broadcast signal transmitted from a broadcasting station includes a control unit 20 for controlling overall operation of the TV by the key operation of the key input unit 22 and the control unit (see FIG. 1). A memory 24 for storing data to be processed at 20), a tuner 10 for receiving and tuning a broadcast signal of a channel selected by the tuning voltage output from the controller 20 from the antenna ANT, An image processor 30 for processing the broadcast signal tuned by the tuner 10 and an image signal input from external terminals (eg, AV1 to AV3), and an image for amplifying the image signal output from the image processor 30. A vertical / horizontal synchronization processor for biasing the vertical synchronization signal and the horizontal synchronization signal of the image signal displayed on the screen of the CRT 40 by the amplifier 32 and the vertical / horizontal synchronization signal processed by the image processor 30 ( 34) and the zero The CRT 40 receiving the video signal output from the amplifier 320 and displaying it on the screen, the audio signal of the broadcast signal received by the tuner 10 and the voice input from external terminals (eg, AV1 to AV3). A voice processor 50 for processing a signal, a voice amplifier 52 for amplifying the voice signal processed by the voice processor 50 to a predetermined level, and a voice signal amplified by the voice amplifier 52 The speaker 60 is configured to allow the viewer to listen to the voice. In addition, as the configuration related to the external input signal switching associated with the present invention, the selection unit 80 for selecting an external signal input terminal 90 and an output of the external signal input terminal 90 for inputting an image signal from the outside and the The signal processor 36 outputs the signal of the selector 80 to the image processor 30 and the audio processor 50 and receives the output of the signal processor 36 to detect the presence or absence of a signal. A signal detection and control means 70 for selecting and outputting a signal at 80 is provided.

In addition, the key input unit 22 is provided with a function key and an external input signal switching key used to control the overall operation of the TV.

In the general TV configured as described above, when a viewer selects a broadcast channel (including an external selection channel) to be watched by operating the key input unit 22, the controller 20 recognizes this and generates a tuning voltage corresponding thereto. 10). Accordingly, the tuner 10 tunes the broadcast signal of the broadcast channel selected by the tuner voltage generated by the controller 20 to the broadcast signal received from the free space through the antenna ANT, thereby adjusting the image processor 30 and the audio processor ( The broadcast signal is input to 50). Thus, the image processor 30 processes and processes the broadcast signal input by being tuned by the tuner 10 or the video signal input from one of the external terminals (eg, AV1 to AV3) by the control signal of the controller 20. The input video signal is input to the video amplifier 32. That is, the image amplifier 32 amplifies the video signal to a level that can be displayed on the screen of the CRT 40 and is supplied to the CRT 40 so that the video signal transmitted from the broadcasting station to the free space on the screen of the CRT 40 or The video signal input from one of the external terminals (eg, AV1 to AV3) is displayed so that the viewer can watch the video.

Here, the vertical / horizontal synchronization processor 34 deflects the image signal and the character broadcast signal displayed on the screen of the CRT 40 in the vertical direction and the horizontal direction based on the vertical synchronization signal and the horizontal synchronization signal processed by the image processor 30. Done.

In addition, the voice processor 50 processes a voice signal input from one terminal of an external signal (for example, AV1 to AV3) or a voice signal from the broadcast signal that is tuned from the tuner 10 to the voice amplifier 52. Type in Therefore, the voice amplifier 52 amplifies the voice signal processed by the voice processor 50 to a predetermined level and outputs it to the speaker 60 so that the viewer can listen to the voice.

Hereinafter, a process in which the user selects an external signal input to the external input selection unit 100 using the external input signal switching key will be described in detail.

If the user wants to switch the external input signal using the external input signal switching key (not shown) of the key input unit 22, the control unit 20 signals the control signal to select the signal input to the selection unit 80. If the signal detection and control means 70 outputs to the detection and control means 70, the signal detection and control means 70 controls the switch of the selector 80 so that the selected signal is output to the image processor 30 and the audio processor 50. And voice are respectively processed and output. At this time, the external input signal switching key is normally controlled to select the input of the external signal input terminal 90 in a predetermined order. That is, "AV1" is selected by one external input signal switching key input, "AV2" is selected twice, and "AV3" is selected three times.

Therefore, in order to watch an external signal input to one of the plurality of external input terminals (for example, AV1 to AV3) (for example, AV3), for example, a signal reproduced by a VCR on a TV, the viewer must use a key input unit (remote control). ), The trouble of having to select the external terminal as "AV3" by operating the key three times. In addition, since the user cannot check whether a signal is input to the "AV3" terminal that the user wants to watch, it is possible to check only after selecting "AV3", and thus may make an error of selecting an external input port for which no signal is input. will be.

The present invention is to solve the above problems, to automatically recognize the current video jack connection state using the control unit and to automatically switch only the video signal of the normal signal input jack every time the external input signal switching key is input; An object of the present invention is to provide an input signal switching device.

1 is a block diagram schematically showing a typical television receiver;

2 is a block diagram schematically showing a television receiver equipped with an input switching device of the present invention; and

3 is a block diagram of another embodiment of an input switching device of the present invention.

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

70: signal detection and control means 80: selection unit

90,210,310: External signal input terminal 100,200,300: External input selector

220: connection presence determination unit 230: signal determination unit

320: signal detector 321: synchronization signal detector

322: synchronization signal separator

According to a preferred embodiment of the input signal switching device according to the present invention for achieving the above object is to detect whether the external input jack is connected to a predetermined number of external input video jack port and the video jack port, respectively A signal discrimination unit for determining whether a connection output judging unit outputs an input signal and whether or not the signal output from the connection existence judging unit is normal, and transmits the result of the determination to the control unit. And a control unit for controlling the display unit to select an image of a port through which a normal input is input, as a result of detection and signal determination of the signal discrimination unit.

The signal discriminating unit is configured to determine whether the signal is normal by separating and detecting the synchronization signal of the signal output from the connection presence determining unit.

The controller may be configured to display a normal video signal according to a predetermined priority when at least two external input signals are simultaneously detected by the external input jack ports.

More preferably, the controller is configured to display a port on which a normal video signal is input from the external input port on a display device and to display a corresponding port of an image currently displayed on the display device differently from other ports.

On the other hand, in the connection presence / absence determination section, the presence or absence of connection is determined by separating and detecting the synchronization signal of the input signal.

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

2 is a block diagram schematically illustrating a television receiver equipped with an external input signal switching device of the present invention. As shown in the drawing, the water receiver having the external input signal switching device of the present invention is controlled by the control unit 20 and the control unit 20 to control the overall operation of the TV by the key operation of the key input unit 22. A memory 24 for storing data, a tuner 10 for receiving and tuning a broadcast signal of a channel selected by the tuning voltage output from the controller 20 from the antenna ANT, and in the tuner 10; An image processor 30 for processing the tuned broadcast signal and an image signal output from the signal processor 36, a character generator 31 for receiving a control signal from the controller 20 and displaying a character; Vertical synchronization of the image signal displayed on the screen of the CRT 40 by the image amplification unit 32 for amplifying the image signal output from the image processor 30 and the vertical / horizontal synchronization signal processed by the image processor 30. Signal and horizontal synchronization A vertical / horizontal synchronization processor (34) for deflecting the signal, a CRT (40) for receiving an image signal output from the image amplifier (32), and displaying it on a screen; and audio of a broadcast signal received by the tuner (10). A voice processor 50 for processing a voice signal output from the signal and the connection determining unit 220, a voice amplifier 52 for amplifying the voice signal processed by the voice processor 50 to a predetermined level, and The video signal from the outside as a novel configuration related to the external component and the general component of the conventional TV receiver composed of a speaker 60 for outputting the amplified voice signal from the voice amplifier 52 so that viewers can listen to the voice An external signal input terminal 210 for inputting an external signal input terminal 210 and the external signal input terminal 210 to determine whether the external signal is connected or not, the normal signal by the output of the connection existence determination unit 220 and the connection existence determination unit 220 Detecting the presence of input Is composed of a signal discriminating unit 230.

Hereinafter, the operation of the present invention configured as described above will be described. Since the operation of a general TV receiver is the same as in the prior art, a description thereof will be omitted and a method of selecting an external input signal will be described in detail.

When the user views the broadcast through the tuner 10 and then switches to a signal input from the outside, the user presses an external input signal switching key of the key input unit 22. The controller 20 recognizes the external input signal switching key input through the key input unit 22 and determines whether the external input terminal 210 is input from the connection presence / determination unit 220. That is, the connection presence determination unit 220 determines whether the connection jack is connected to the external input terminal 210 from the outside and transmits the determination result to the control unit 20. The input signal of the external input terminals (AV1 to AV3 in the drawing) determined to be connected by the connection presence / absence determination unit 220 is transmitted to the signal discrimination unit 230, and the signal input unit 230 receives the input signal. It determines whether or not it is a normal signal and transmits the determination result to the control unit 20. On the other hand, it is preferable that the order of determining whether the connection determining unit 220 is connected or not is confirmed in a predetermined order in the control unit 20. When it is determined that the signal discrimination unit 230 is a normal signal, the control unit 20 supplies an output signal of the presence / absence determination unit 220 to the image processor 30 and the audio processor 50 to process the image and the audio, respectively. To be output to the CRT 40 and the speaker 60. In addition, when the user presses the external input signal switching key again, the controller 20 transmits another signal connected to the connection presence / absence determination unit 220 to the signal determination unit 230 and transmits the result to the control unit 20. The controller 20 repeats the above process to control only the output of the input terminal to which a normal signal is input while being connected to the external input terminal 210. In this case, when only one normal input is connected, it is preferable that the external input signal switching key is no longer operated so that an image of the same terminal is output.

More preferably, when the external input signal switching key is input, the controller 20 controls the connection presence / absence determination unit 220 and the signal discrimination unit 230 to be connected to the external input terminal 210 and input a normal signal. By determining the terminal to display all the ports through which the normal signal is input through the character generator (OSD) 31 and separately displaying the terminal currently displayed among them, the user can easily distinguish and select an external input signal. .

In addition, the character generator 31 may separately display a terminal connected to the terminal and a terminal to which a normal signal is input.

3 is a block diagram of another embodiment of an input switching device of the present invention. As shown in the drawing, the external input selector 200 of FIG. 2 is configured as the signal detecting unit 320 and the connection determining unit 220 and the signal discriminating unit 230. The signal detector 320 includes a sync signal separator 322 and a sync signal detector 321, and the sync signal separator 322 separates a sync signal from a signal input from an external input terminal 310 to sync signal detector. 321 and transmits the result of the determination to the control unit 20 if it is determined to be a normal signal. The output of the 310 is to be output to the image processor 30 and the audio processor 50.

While the invention has been described in detail only with respect to the described embodiments, it will be apparent to those skilled in the art that various modifications and variations are possible within the spirit of the invention, and such modifications and variations belong to the appended claims.

As described above, according to the external input switching device according to the present invention, the current state of the video jack connection is automatically recognized using the control unit, and only the video signal of the jack that the normal signal is input whenever the external input signal switching key is inputted automatically. By switching to, the TV user has an effect of conveniently selecting only the AV input to be viewed from many external inputs.

Claims (5)

A predetermined number of external input video jack ports; and A connection presence judging unit which detects whether an external input jack is connected to each of the video jack ports, transmits the detection presence to the control unit, and outputs an input signal; and A signal discrimination unit for determining whether the signal output from the connection determining unit is normal and transmitting the determination result to the control unit; And And a controller configured to control the display apparatus to select an image of a port through which a normal input is input as a result of signal detection of the connection determination unit and a signal determination unit of the signal determination unit. The method of claim 1, And the signal discriminating unit determines whether the signal is normal by separating and detecting the synchronization signal of the signal output from the connection presence / absence determination unit. The method of claim 1, wherein the control unit And at least two external input signals are simultaneously detected by the external input jack ports, the normal image signal being displayed according to a preset priority. The input device of claim 1, wherein the controller displays a port on which a normal video signal is input from the external input port on a display device, and displays a corresponding port of an image currently displayed on the display device differently from other ports. Signal switching device. 3. The input signal switching device according to claim 2, wherein the presence or absence of a connection is determined by separating and detecting a synchronization signal of a signal input to the connection presence / determination section.