KR20000037668A - Method for controlling television during signal absence - Google Patents

Abstract

PURPOSE: A method for controlling television during signal absence is provided to kill the image when signal is absent for a predetermined time interval, and then turn off the television set after another predetermined time interval. CONSTITUTION: A method for controlling television during signal absence includes seven steps. At the first step(S100), whether the channel includes signal is determined. At the second step, the sound is killed(S130) and whether the signal absence goes on is determined(S140). At the third step, the sound is restored(S110) when signal comes. At the forth step, the video is killed, and an LED(light emission diode) is turn on(S150) after a predetermined time period of signal absence. At the fifth step(S180), key input is detected for another period of time interval. At the sixth step, sound and video are restore with a key input and the LED is turned off(S170). At the seventh step, the power is turned off(S200) when no key input comes.

Description

A television controlling method when no signal is received

The present invention relates to a non-signaled television control method. Specifically, when a no-signal state is detected in a selected channel, a voice mute is first performed. When the no-signal state lasts for a predetermined time, the output is primarily output to the screen. And then wait for a key input for a predetermined time, and then turn off the power and switch to the standby state when there is no key input.

Figure 1 shows a block diagram of a conventional general television.

As shown in the drawing, a conventional general television tuner 50 extracts only a frequency band of a channel selected by a user by tuning a radio frequency signal received through an antenna ANT from airwaves, and according to an input local oscillation signal. IF detector 60 for detecting an intermediate frequency from the frequency band signal of the channel tuned through the tuner unit 50, and an image intermediate frequency signal (PIF) and audio from the signal output from the IF detector 60. P / S separation unit 70 for separating the intermediate frequency signal (SIF), and voice detector for separating the voice signal (S) from the voice intermediate frequency signal (SIF) output from the P / S separation unit (70) And an image detector 110 for separating the image signal P from the image intermediate frequency signal PIF output from the P / S separator 70, the audio detector 80, and an input. After the voice signal (S) of the external device 150 is selected according to the input control signal Select a predetermined signal according to a selection signal input from the audio processor 90 that is externally displayed through the speaker 100 and the image signal P of the image detector 110 and the external device 150. Thereafter, the luminance signal and the color signal are separated, and each color band is extracted from the color signal, and then demodulated and transmitted to the CRT 140. The image processor 120 receives a signal corresponding to the input operation control signal. OSD (On Screen Display) 130 for outputting the information on the CRT (140) screen to overlap the screen, and various operation modes (tuning, volume control, screen control, external device mode switching) of the television Etc.), a remote controller 20 for remotely controlling various operation modes of the television, and a remote controller key for receiving a signal output from the remote controller 20 and outputting a signal accordingly. Signal input And a microprocessor 40 for controlling the overall operation of the television by controlling a corresponding component in accordance with a signal output from the key panel 10 or the remote controller key signal input unit 30.

The operation of such a television is explained as follows.

When the user selects a broadcast channel using the key panel 10 or the remote controller 20, the microprocessor 40 outputs a corresponding tuning voltage to the tuner unit 50 to tune the corresponding channel. As described above, in the broadcast signal of the broadcast channel tuned by the tuner unit 50, an intermediate frequency is detected from the broadcast signal through the IF detector 60, and the voice intermediate frequency is passed through the P / S separation unit 70. The signal SIF and the image intermediate frequency signal PIF are separated.

The voice intermediate frequency signal SIF output from the P / S separation unit 70 passes through the voice detector 80 and the voice signal S is detected, and the voice processor 90 undergoes a predetermined process. The image intermediate frequency signal PIF output through the speaker 100 and output from the P / S separation unit 70 passes through the image detector 110 to detect the image signal P, thereby processing the image processor 120. ) Is output to the CRT 140 through a predetermined process.

Meanwhile, the television displays a menu screen, channel change information, volume change information, and input signal (RF or AV input) change information in the form of characters or figures on a video screen displayed by the CRT 140. It has an OSD function.

The OSD function displays the corresponding character screen on the background of the displayed image screen or displays the corresponding character screen on the blue-back image screen, so that the user can easily recognize the current state when performing each function. This is a useful feature.

In such a television, the audio is muted in a non-signal state in which a broadcast signal is not received on a selected channel, and when the non-signal state continues for a predetermined time, the power is turned off to a standby state to prevent unnecessary waste of power.

However, the video output is continued for a considerable time until the standby state, which still requires a waste of power because the CRT and necessary components must be driven.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and its object is to perform image mute once when no signal continues for a predetermined time, wait for a user's key input for a predetermined time, and then, if there is no key input. It is therefore an object of the present invention to provide a method of controlling a signalless television when the power is turned off to a standby state.

1 is a block diagram of a general television

2 is a block diagram of a television employed in accordance with the present invention;

3 is a flowchart illustrating a signal-free television control process according to an exemplary embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

10 key panel 20 remote control

21: signal response unit 30: remote control key signal input unit

30: remote control key signal input unit 40: microprocessor

50: tuner 60: IF detector

70: P / S separation unit 80: voice detector

90: voice processing unit 100: speaker

110: image detector 120: image processor

130: OSD unit 140: CRT

150: external device 160: LED

In the non-signal television control method of the present invention, a process of determining whether or not a selected channel is no signal, a process of performing a voice mute if the no signal state, and determining whether the non-signal state continues for a predetermined time, If not, the process of releasing the audio mute and performing the television function; if the signal-free state continues for a predetermined time, performing the video mute, turning on the LED, and again whether or not the key is pressed within the predetermined time that the signal-free state continues. The process of judging, releasing the audio mute and video muting if there is no signal within a predetermined time or if there is a key input, turning off the LED and performing a television function, and turning off the power if there is no key input within the predetermined time. It is characterized by consisting of a process to switch to the standby state.

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.

The configuration of the television employed in the embodiment of the present invention further includes means for informing the viewer when the video is muted, as shown in FIG.

That is, the key panel 10, the remote controller 20, the first and second remote controller key signal input units 30a and 30b, the microprocessor 40, the tuner unit 50, the IF detector 60, and P / S separation. The unit 70, the voice detector 80, the voice processor 90, the speaker 100, the image detector 110, the image processor 120, the OSD unit 130, the CRT 140, the signal transceiver It consists of 150 and LED.

In such a configuration, the key panel 10 or the remote controller 20 is an input means for operating the television, and includes a volume up / down key for volume control and a predetermined key (menu key, image quality control key, Remote control unit 20 having a plurality of keys including a direction key, a number key), a key for sound quality setting, and a key for image quality setting, and outputs a key signal corresponding to a user's key operation, and is typically remotely inputable. A key signal corresponding to a key operation is transmitted on an infrared carrier using a remote control, and the remote controller key signal input unit 30 provided in the television body demodulates, detects, and amplifies the received infrared carrier to be described later. Is applied.

Then, the microprocessor 40 controls the overall operation of the television based on the key signal from the key panel 10 or the remote controller 20.

In addition, the LED 160 is controlled to notify the user when image muting is performed due to no signal.

The tuner unit 50 outputs a broadcast signal received by being tuned to a channel corresponding to the control of the microprocessor 40.

Meanwhile, the voice processing unit 90 is a signal capable of outputting a voice signal received by the tuner unit 30 and applied through the IF detector 60, the P / S separation unit 70, and the voice detector 80. Processed and output to the speaker 100, and adjusts the volume of the output under the control of the microprocessor (40).

The image processor 120 processes the image signal received from the tuner unit 30 and applied through the IF detector 60, the P / S separation unit 70, and the image detector 110 into a displayable signal, thereby providing a CRT. Output to 140.

In addition, the OSD unit 130 is a character screen display means for synthesizing the OSD text signal corresponding to the control of the microprocessor 40 to the image signal output from the image processing unit 120 and outputs it to the CRT 140.

Although not shown, the OSD unit 130 may include a timing unit for determining the horizontal / vertical position of the OSD, a character ROM for storing and exporting the OSD text font, a ROM for storing a program for controlling the OSD text display, and an OSD character. RAM operating a program for display control, and controlling the display of OSD characters based on the control signal for OSD character size conversion and OSD character type selection from the microprocessor 40 and vertically with the RGB signal for displaying the character. The display generator outputs a blanking signal.

The LED 160 is turned on when image muting is performed under the control of the microprocessor 40 so that the viewer can recognize the image.

Next, a detailed description will be given with reference to the flowchart of FIG. 3 attached to a no-signal television control process according to a preferred embodiment of the present invention in a television having the above-described configuration.

When the main power is supplied to the television, the microprocessor 40 puts the television on standby and waits for a key input by the user through the key panel 10 or the remote controller 20.

At this time, when the user presses the power-on key by using the key panel 10 or the remote controller 20, the microprocessor 40 recognizes this, switches to the active state, and controls each component of the television to watch the broadcast of the selected channel. To control each component.

First, it is determined whether the selected channel (the channel which was finally selected without the input of the channel change key) is in a no signal state, that is, a broadcast signal is not received (S100).

As a result of the determination, if there is a broadcast signal received through the selected channel, the voice mute is released for the case where the voice is muted in step S130 (S110), and the function of the television is selected through the speaker 100 and the CRT 140. Each component is controlled to watch the broadcast of the channel (S110).

However, if there is no broadcast signal received through the selected channel, voice muting is performed so that noise is not output (S130), and it is determined whether or not the signal is continuously maintained for a predetermined time (for example, 1 minute) (S140).

If the no-signal state is shorter than the predetermined time, the process proceeds to step S110 to normally perform the function of the television.

On the other hand, if no signal continues for a predetermined time, the image output to the CRT 110 is blocked to perform image mute, and the LED 160 is turned on so that the user can recognize it. The image muting may be performed by controlling the image processor 120 to prohibit the output of the image to the CRT 140 as well as controlling the power supply means (not shown) to cut off the power supplied to the CRT 140, thereby unnecessary waste of power. Can be prevented.

After the video mute is first performed, it is determined whether there is a key input within the predetermined time while the signal-free state continues for a predetermined time (for example, 8 minutes), and a broadcast signal is received within the predetermined time, or the key input is recognized. When the audio mute and the video mute are released, the LED 160 is turned off, and then the process proceeds to step S120 to perform the function of the television.

That is, if the user inputs a key such as a channel change to control the operation of the television within a predetermined time from the no-signal state or the non-signal state continues, the process proceeds to step S120 to perform the normal television function.

However, if the signal-free state continues for a predetermined time and there is no key input within the predetermined time, that is, when the viewer falls asleep while watching television or leaves the room where the television was being viewed and does not recognize the signal-free state, the power is turned off. To enter the standby mode (S160 to S200).

As described above, according to the present invention, when all the broadcast programs of the tuned channel are terminated and the signal-free state continues, if the user does not recognize it and does not properly control the television, the video mute is first performed. By switching off the power supplied to the components other than the component for receiving the key input to the standby mode, unnecessary waste of power can be reduced as much as possible.

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)

Determining whether there is no signal of the selected channel, performing a voice mute if there is no signal, determining whether the non-signal state continues for a predetermined time, and canceling the voice mute if the signal is released within a predetermined time. Performing video muting, turning on the LEDs, determining whether a key is pressed within a predetermined time period when the no-signal state continues, and no-signaling within the predetermined time period. A process of releasing the audio mute and the video muting if the key is out of state or turning off the LED, turning off the LED, and performing a television function, and turning off the power and turning to standby if there is no key input within a predetermined time. No signal television control method, characterized in that.