KR20000028155A - Method for warning weak signal of external signal when connecting external device - Google Patents

Abstract

PURPOSE: A method for warning a weak signal of an external signal in connecting an outer device is provided to identify whether images and sound signals from outside exist, when converting into a connection mode with an external AV(Audio-Visual) device, to decide whether the connected AV device is well connected or a signal of the AV device is not generated, when the signals do not exist, and to display the result as OSD(On Screen Display) characters. CONSTITUTION: A TV set has a connection terminal with an external image processor, and has a TV broadcasting receiving mode and an image receiving mode of the outer image processor. A method for warning a weak signal of an external signal when connecting an outer device comprises the steps of: deciding whether an image signal and a sound signal exist, entered through the connection terminal when an input mode of an outer image signal is selected by a user; deciding whether the external image processor is well connected, after deciding one signal does not exist among the image signal and the sound signal; warning that the connection is exact and a signal source does not exist through OSD(On Screen Display) characters, after deciding the connection is exact; and warning that the connection is not exact through the OSD characters, after deciding the connection is not exact.

Description

Warning method of weak signal when AV mode

The present invention relates to a method of operating a television receiver according to the combination of the corresponding AV device when the external video device is connected to the television receiver, and in particular, when switching to the connection mode with the external AV device. If there is no signal, check whether there is a connected AV device is well connected or if there is no signal from the AV device. It is about a warning method.

In general, a television receives a demodulated broadcast signal from a broadcasting station, demodulates it, and outputs it as a video signal and an audio signal through a CRT and a speaker. The approximate components of a typical television that perform these functions are the microcomputer, which manages the overall operation of the system, the intermediate frequency processing module for processing video and audio intermediate frequencies (VIF, SIF), and the received video signals. A video demodulation module for reconstructing an image signal and a deflection module for deflection are separately configured to each module (meaning each chip) to receive and process broadcast signals.

In recent years, such a television receiver is connected to an external image providing device such as a learner, a game console, or an LD or a VCR to receive various images and sounds according to the taste of a viewer. The operation mode of the television receiver should be selected by dividing it into a TV mode for performing a video mode and an AV mode for receiving an image and sound from an external video device.

At this time, when the user selects the AV mode but the external device is not correctly connected due to a mistake of the user, noise is displayed through the CRT of the television receiver.

In addition, even if it is properly connected, the user may be annoyed due to a problem such that the user does not recognize what is wrong while being present without performing the operation of the AV device.

An object of the present invention for solving the above problems is to check the existence of video and audio signals coming from the outside when switching to the connection mode with the external AV device, and if there is no signal connected to the connected AV device well The present invention provides a method of warning a weak signal of an external signal when an external device is connected to determine whether a signal is generated or whether a signal is not currently generated in an AV device and displaying it as an OSD text.

1 is a block diagram of a typical AV television system

2 is a flowchart illustrating a weak signal warning process of an external signal when an external device is connected according to the present invention.

A feature of the present invention for achieving the above object is, when inputting an external image in a television receiver having a connection terminal with an external image processing apparatus, and having both functions of a television broadcast receiving mode and an image receiving mode of the external image processing apparatus. In the operating method, if the external video signal input mode is selected by the user, the first step of determining whether there is both the video signal or the audio signal flowing through the connection terminal and the video signal or the audio signal in the first step If it is determined that one or more signals do not exist, the second step of determining whether the connection to the external image processing apparatus is correct, and if the connection is determined to be correct through the second step, the connection is correct and the signal source is A third step that warns that the connection is inadequate, and an OSD statement if it is determined that the connection To include a fourth step to warn that the connection has not been made properly.

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

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

1 is a block diagram of a general television receiver to which the present invention is applied. In the configuration shown in FIG. 1, reference numeral 1 denotes an antenna, and 2 denotes a radio frequency received through the antenna 1. (Radio Frequency: hereinafter referred to as RF) An RF amplifying unit for amplifying a signal, 3 denotes a radio frequency signal output from the RF amplifying unit 2 and an oscillation frequency signal output from the local oscillating circuit 17 to be described later. Denotes a first mixer which outputs an intermediate frequency signal by mixing.

Further, reference numeral 4 denotes an IF amplifier section for amplifying the intermediate frequency signal output from the first mixer 3, and 5 denotes an image intermediate frequency signal PIF in the intermediate frequency signal output from the IF amplifier section 4. And a P / S separator for separating the voice intermediate frequency signal SIF, and 6 represents a voice detector for detecting a voice signal from the voice intermediate frequency signal SIF output from the P / S separator 5. 7 denotes an image detector for detecting an image signal from an image intermediate frequency signal PIF output from the P / S separator 5.

In addition, reference numeral 8 denotes a remote control device that allows a viewer to select a desired channel or to select each mode of the television, that is, a TV / AV mode, and 9 denotes an infrared signal from the remote control device 8. 10 shows a receiver for converting a conventional code signal, 10 denotes a channel memory in which predetermined channel data is stored, and 11 denotes a microprocessor which controls the entire system in accordance with an input signal from the remote controller device 8.

In addition, reference numeral 12 denotes a screen display for overlapping and outputting a character or a picture on a screen on which a broadcast signal is output separately from the broadcast signal according to the control signal of the microprocessor 11 (On Screen Display). (Hereinafter referred to as OSD), and 13 denotes a PWM generator for generating a predetermined pulse width modulation (PWM) signal according to a control signal from the microprocessor 11, and 14 denotes the above. An integration circuit for integrating the PWM signal output from the PWM generator 13 to generate a predetermined level signal is shown.

In this case, when the viewer selects a predetermined channel using the remote controller device 8, the microprocessor 11 reads out channel data corresponding to the channel selected by the viewer from the channel memory 10 and then based on the selected channel. By controlling the PWM generator 13 to generate a predetermined PWM signal, the PWM signal is output as a voltage control signal corresponding to the channel selected by the viewer through the integrator circuit 14.

In addition, reference numeral 15 is provided for a precise tuning operation, and represents an Auto Fine Tunning circuit (hereinafter referred to as AFT) circuit 15, and 16 represents a voltage signal applied from the integrating circuit 14; An adder for adding a voltage signal applied from the AFT circuit 15 is shown, and 17 represents a local oscillating circuit for outputting a predetermined oscillation frequency.

In addition, reference numeral 18 controls the amplification degree of the above-described RF amplifier 102 and the IF amplifier 4 on the basis of the level of the image signal detected by the image detector 7, the image detector ( Figure 7 shows the Automatic Gain Control (AGC) circuit that controls the video signal output level from 7).

On the other hand, reference numeral 19 denotes an external AV device such as a VCR or a laser disc player, and 20 denotes the voice detector 6 and the image detector 7 according to the switching signal from the microprocessor 11 described above. A first switching section for selectively outputting audio and video signals from and external audio and video signals from the external AV device 19 is shown.

Although reference numeral 23 is not shown for the image signal output from the first switching unit 20, the color, tint, and brightness are in accordance with the control signal from the microprocessor 11. A video processing unit which processes (Brightness) and the like and outputs R (Red), G (Green), and B (Blue) signals corresponding to the video signal.

The RGB signal output from the image processor 23 is output by mixing RGB and OSD blanking signals Y ′, which are output signals of the OSD generator 12 described above, in the second mixer indicated by reference numeral 24. Reference numeral 25 denotes a CRT driving unit for driving the CRT based on the RGB signal output from the mixer 24.

In addition, reference numeral 21 denotes a base, treble, and volume according to a control signal from the microprocessor 11 although not shown for the voice signal output from the first switching unit 20. A voice processing unit for executing voice processing such as a volume), and 22 denotes a voice amplifying unit for amplifying and outputting the voice signal processed by the voice processing unit 21 to a speaker.

In a conventional television receiver configured as described above, when the external video device according to the present invention is connected to a weak signal, a microcomputer is provided so that the user does not feel any screen mixing or abnormality by automatically blanking the screen. An operation process of the processor 11, the image processor 23, and the peripheral device will be described with reference to FIG. 2.

2 is a flowchart illustrating a weak signal warning process of an external signal when an external device is connected according to the present invention.

In step S101, the microprocessor 11 determines whether the user has selected the AV mode through the remote control device 8, and if it is determined that the user has not selected the AV mode, the microprocessor 11 proceeds to step S102 to perform an operation of a normal television receiver. do. By performing this process, the user is provided with convenience for watching television.

If it is determined in step S101 that the user has selected the AV mode, the process proceeds to step S103 to check whether there are video and audio signals drawn from the connected AV device. Thereafter, in step S104, it is determined whether both the video and audio signals exist based on the result of the check in step S103, and when it is determined that there is both, the process proceeds to step S105 to perform the operation according to the normal AV operation mode.

In this case, the method of determining whether both the image and the audio signal exist in step S104 is performed by determining whether the horizontal and vertical synchronization signals exist from the signal received from the image processor 23 when the image is present. Also, in the case of sound, the voice furry unit 21 determines.

On the other hand, if it is determined in step S104 that both the video and audio signals do not exist, that is, if only one of the video and audio signals exists, the process proceeds to step S106 in which the external AV device 19 is connected through the AV terminal. It will check the generated unique ID. At this time, the external AV devices 19 typically have a unique ID for recognizing the AV device, such as whether it is a computer or an LD.

Therefore, in step S106, the unique ID generated by the external AV device 19 connected through the AV terminal is examined, and in step S107, it is determined whether the ID exists through the process of step S106.

If it is determined in step S107 that the ID of the external AV device 19 is detected, that is, it is determined that the connection state is normal, the process proceeds to step S108. In step S108, the microprocessor 11 controls the OSD generator 12. The OSD text is displayed on the entire CRT screen to indicate that there is no signal currently provided by the corresponding AV device.

On the other hand, if it is determined in step S107 that the external AV device 19 is not in a normal connection state, the flow advances to step S109 to warn the non-conformity of the external device connection by the OSD text.

When a user selects an AV mode by providing a weak signal warning method of an external signal when connecting an external device according to the present invention operating as described above, a user usually makes a mistake when the external device is not correctly connected due to a user's mistake. If the user selects the AV mode but the external device is not connected correctly due to a mistake by the user, even if the noise is displayed or correctly connected through the CRT of the television receiver, The problem that the user is annoyed by the problem of not being able to recognize what went wrong while remaining without performing an operation can be solved.

While the invention has been shown and described with respect to particular embodiments, it will be apparent to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the invention as set forth in the claims. Anyone can see it easily.

Claims (1)

A method of operating an external video input on a television receiver having a connection terminal with an external video processing device and having both a television broadcast reception mode and a function of a video reception mode of the external video processing device, A first step of determining whether all video signals or audio signals flowing through the connection terminal exist when an external video signal input mode is selected by a user; A second step of determining whether the connection with the external image processing apparatus is correct when it is determined that at least one signal of the video signal or the audio signal does not exist in the first step; A third step of warning through the OSD character that the connection is correct and no signal source is determined through the second step; And And a fourth step of alerting that the connection has not been properly made through the OSD text when it is determined that the connection is inaccurate through the second step.