KR19980040850A - How to operate audio in monitor off mode - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to audio related technologies in a multimedia monitor, and more particularly, to a method of operating an audio in an off mode that enables an audio circuit to be heard even when a vertical / horizontal synchronization signal is not input from a computer.

This method of the present invention comprises the steps (301, 302) of waiting in the off mode when the horizontal / vertical synchronization signal is not input; Determining whether an audio key is input when a key is input in an off mode (303, 304); If it is an audio key, switch to on mode to display sound (305, 306); Displaying the sound and turning on the audio power while switching to the off mode (307); Judging whether a horizontal / vertical synchronization signal is input if it is not an audio key, and if not, switching to on mode again to display a no signal and to turn off mode (308 to 311); And operating in the normal mode when the horizontal / vertical synchronization signal is input (312).

Therefore, according to the present invention, since the audio circuit is normally operated in the off mode, it is possible to listen to music and the like using the audio circuit of the monitor without the help of a computer.

Description

How to operate audio in monitor off mode

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to audio related technologies in a multimedia monitor, and more particularly, to a method of operating an audio in an off mode that enables an audio circuit to be heard even when a vertical / horizontal synchronization signal is not input from a computer.

With the rapid growth of the multimedia field, the distinction between conventional home appliances and computers is blurring, and personal computers are also being developed into multimedia computers that can watch various movies and music. Here, the multimedia refers to a system and service that integrates various types of information such as text, voice, music, video, and the like to generate, transmit, and process information.

Such a multimedia computer requires not only an image processing function but also a high quality audio function. To this end, most multimedia computers provide a sound card for processing audio or a dedicated audio chip on a monitor to provide high quality audio functions. As such, a monitor equipped with an audio circuit must provide an audio power source for a dedicated chip.

On the other hand, in recent years, DPMS technology has been widely adopted in monitors in order to efficiently use the power of the monitor in an energy-saving aspect.

Here, Display Power Management Signaling (DPMS) is a kind of office equipment that is defined by the Video Electronics Standards Association (VESA), a video equipment standardization organization, in order to save energy by reducing the waste of power consumed in the most widely used monitors. It relates to a power control technology.

In the DPMS, as shown in Table 1, four states are defined according to the state of APM (Advanced Power Management) operated in the computer main body, and horizontal and vertical synchronization signals are used to identify them. Here, APM is a computer power management process defined by Microsoft and IBM.

condition signal Required Power saving degree Normal recovery time Horizontal synchronization Vertical synchronization video On has exist has exist Normal input compulsion Saving - Standby none has exist Blanking option small short Suspend has exist none Blanking compulsion versus Kim off none none Blanking compulsion maximum -

As shown in Table 1, the state (or mode) in the DPMS is on (on), standby (stand-by), suspend (suspend), off (off), dual on (on), suspend Suspend and off states must be at least acceptable.

In the on state (mode), there are both a horizontal synchronous signal and a vertical synchronous signal input from the computer through the D-sub, and the video signal is normally input and displayed on the screen. In standby mode (mode), there is no horizontal synchronous signal input from the computer through D-sub, only vertical synchronous signal, and the video signal is blanked so that nothing is displayed on the screen. This is a state of saving. In the suspend state (mode), there is a horizontal synchronous signal input from the computer through the D-sub, no vertical synchronous signal, and the video signal is blanked so that nothing is displayed on the screen. It is a state of saving. The off state (mode) is a state in which the power is off, there is no vertical and horizontal synchronization signal, the video signal is blanked, and the power is maximized.

In this way, the state of the DPMS is determined according to the synchronization signal input from the computer, and power can be saved by turning off or on the power of the corresponding part according to each state.

However, even when the multimedia computer needs to listen to the audio only without the help of the computer main body, conventionally, if the horizontal synchronization signal and the vertical synchronization signal are not input from the computer, the monitor operates in the off mode by DPMS technology. Therefore, the power of the audio system is cut off, so there was a problem that the audio can be enjoyed in the off mode.

That is, in the off mode, as shown in FIG. 2, when any key is pressed, the horizontal / vertical sync signal is checked, and when there is no sync signal, the signal is switched to the on mode and returns to the off mode after displaying a no signal. 201 to 207, the signal is switched to the normal operation (on) mode (210). Therefore, in the off mode, no voltage was applied to the power supply circuit, so audio listening was impossible.

Accordingly, the present invention has been made to solve the above problems, and provides an audio operating method in the off mode to operate only the audio circuit in the off mode to listen to the audio only without a signal input from the computer. There is a purpose.

In order to achieve the above object, the method of the present invention includes a built-in audio circuit to amplify the audio signal input from the outside to be heard through the speaker and DPMS technology is applied according to the horizontal and vertical synchronous signal on mode, A monitor operating in a suspend mode, an off mode, etc., comprising: waiting in an off mode if a horizontal / vertical synchronization signal is not input; Determining whether an audio key is input when a key is input in an off mode; If it is an audio key, switching to the on mode to display a sound; Turning on the audio power while switching the off mode after displaying the sound; Determining whether a horizontal / vertical synchronization signal is input if not an audio key, and if not, switching to an on mode to display a no signal and to switch to an off mode; And operating in a normal mode when the horizontal / vertical synchronization signal is input.

1 is a block diagram showing an audio circuit of a general monitor;

2 is a flowchart illustrating a self test operation flow in a monitor;

3 is a flowchart illustrating a method of operating audio in an off mode according to the present invention.

* Explanation of symbols for main parts of the drawings

100: main power supply device 110: audio integrated circuit device

112a, b: audio input terminal 114a, b: speaker

120: micom 130: key input unit

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

1 is a circuit diagram showing an audio circuit of a multimedia monitor according to the present invention.

As shown in FIG. 1, the audio circuit according to the present invention includes a main power supply 100 (SMPS), an audio integrated circuit 110, a microcomputer 120, and a key input unit 130.

Referring to FIG. 1, the main power supply 100 receives a commercial AC power and converts it into a DC, and then a switching device switches by PWM control to induce a plurality of voltages to a secondary transformer, which is required by an audio circuit and a monitor. Provide various voltages.

The audio integrated circuit 110 is operated by a voltage input from the main power supply 100 to amplify the R channel audio signal and the L channel audio signal input through the audio input terminals 112a and 112b.

In this case, when the mute signal is input through the 'Mute' terminal, the output of the amplifier inside the audio IC 110 is cut off so that noise is not heard through the speakers 114a and 114b. Adjust the volume of the sound output.

Here, in the exemplary embodiment of the present invention, the audio integrated circuit 110 has a case in which the mute signal terminal and the volume control terminal are respectively described as an example, but the mute and volume control functions may be processed by one terminal to reduce the number of terminals. have. In this case, in order to distinguish between the volume control voltage and the mute control signal, when the volume control voltage becomes less than or equal to a predetermined voltage (for example, 0.4V or less), the output is muted as a mute signal.

The microcomputer 120 receives horizontal and vertical synchronization signals (H.sync, V.sync), and outputs a corresponding volume control signal and a mute control signal when an audio volume and mute key is operated by a user.

In addition, the microcomputer according to the present invention, as shown in Figure 3, the step of waiting in the off mode when the horizontal / vertical synchronization signal is not input (301, 302); Determining whether an audio key is input when a key is input in an off mode (303, 304); If it is an audio key, switch to on mode to display sound (305, 306); Turning on the audio power while switching to the off mode after displaying the sound (307); Determining whether a horizontal / vertical synchronization signal is input if not an audio key, and if not, switching to on mode again to display a no signal and switching to off mode (308,309,310,311); When the horizontal / vertical synchronization signal is input, step 312 of operating in the normal mode is sequentially performed.

Referring to FIG. 3, if the microcomputer 120 does not determine whether the horizontal synchronous signal H.sync or the vertical synchronous signal V.sync is input and is not input, the microcomputer 120 enters the off mode by the DPMS technology and only + 5V. To be alive. Therefore, only the microcomputer operated by the 5V power supply is operated, and the horizontal deflection, the high voltage part, and the CRT are turned off.

In this state, if any key is pressed, the process of the microcomputer 120 wakes up to determine whether the input key is an audio key, and if it is an audio key, switches to the on mode.

Since the monitor system operates normally in the on mode, it displays sound on the screen to indicate that the audio circuit is to be operated in the off mode, and then continues to provide the power required by the audio circuit while operating in the off mode. .

Therefore, since the audio circuit operates normally even in the off mode, the audio signal input from the outside through the audio input terminals 112a and 112b is sounded through the speakers 114a and 114b of the monitor.

On the other hand, if it is determined that the audio key is an arbitrary key other than the audio key, it is determined whether a horizontal / vertical synchronization signal is input as in the prior art. Then, it returns to the off mode. If the horizontal / vertical sync signal is inputted, normal operation (on) mode is entered.

As described above, according to the present invention, since the audio circuit is normally operated in the off mode, it is possible to listen to music using the audio circuit of the monitor without the help of a computer.

Claims (1)

The built-in audio circuit can amplify the audio signal input from the outside to be heard through the speaker. DPMS technology is applied to monitors operated in on mode, suspend mode, off mode, etc. according to horizontal and vertical synchronization signals. , Waiting (301, 302) in the off mode if the horizontal / vertical synchronization signal is not input; Determining whether an audio key is input when a key is input in an off mode (303, 304); If it is an audio key, switch to on mode to display sound (305, 306); Displaying the sound and turning on the audio power while switching to the off mode (307); Judging whether a horizontal / vertical synchronization signal is input if it is not an audio key, and if not, switching to on mode again to display a no signal and to turn off mode (308 to 311); And Operating in the normal mode when a horizontal / vertical synchronization signal is input;