KR20040008858A - Mike input volume control system for portable computer - Google Patents

Abstract

PURPOSE: A system for adjusting a microphone input volume of a portable computer is provided to prevent a howling phenomenon being generated according as a space between a cover unit and a main body of a portable computer is shortened. CONSTITUTION: A microphone(14) inputs voice of a user. A cover position sensing unit outputs a volume adjusting signal according to positions of a cover unit. An inputted volume adjusting circuit(52) adjusts a volume of a signal being inputted from the microphone(14) according to a sensing signal from the cover position sensing unit. An audio circuit unit(50) outputs a microphone input signal the volume thereof is adjusted through the inputted volume adjusting circuit(52) through a speaker(12). The cover position sensing unit outputs a volume adjusting signal for adjusting volume of a microphone input signal according to opening/closing angles of the cover unit from a computer main body.

Description

MIKE INPUT VOLUME CONTROL SYSTEM FOR PORTABLE COMPUTER}

The present invention relates to a microphone input volume control system of a portable computer, and more particularly, to a microphone input volume control system for preventing howling phenomenon that occurs as the distance between the cover portion and the main body of the portable computer is reduced.

Currently, most computers include a speaker for providing sound and a microphone for supporting an Internet phone function, a voice chat function, and a voice recognition function through the Internet.

5 is a perspective view of a portable computer provided with a speaker and a microphone. As shown in the figure, the portable computer 101 has a plate-shaped computer main body 103 in which various hardware modules are embedded, and a cover portion 105 that is foldably coupled to the upper portion of the main body 103.

The front part of the body 103 is provided with a keyboard 109 for typing input work and a touch pad 110 that is a pointing input means, and a speaker 112 and a microphone 114 are provided, and the cover part 105 is provided with a main body. A display unit 107 for displaying the image signal from 103 is provided. Accordingly, the user rotates the cover portion 105 from the main body 103 so that the display portion 107 and the keyboard 109 are exposed to use the portable computer 101, and after use, the cover portion 105 is finished. The cover part 105 is pivotally folded to closely contact the main body 103 to shield the display unit 7 and the input means 109 and 110.

In the state in which the cover portion 105 is opened, the user can input a voice through the microphone 114 provided in the main body 103 to use an Internet phone function, a voice chat function, a voice recognition function, and the like. The microphone input system of the portable computer 101 is as shown in FIG.

As shown in the drawing, a conventional microphone input system includes a microphone 114 for a voice input of a user, and an audio circuit unit 150 for mixing a signal input from the microphone 114 and outputting the mixed signal to the speaker 112. .

The microphone 114 converts a voice signal from the user into an electrical analog signal and provides the same to the audio circuit unit 150. The audio circuit unit 150 converts the input microphone input signal mic_in through the speaker 112. Send it out. Accordingly, when the user inputs a voice into the microphone 114, the voice of the user may be directly output to the speaker 112 through the audio circuit unit 150.

However, since the position of the cover portion 105 can be freely rotated within a predetermined angle with respect to the rear end portion of the main body 103, a case where a voice is input while the cover portion 105 is not fully opened may occur. .

In this case, since the angle formed by the main body and the cover portion is reduced, the voice signal input by the user is reflected by the cover portion and is input again into the microphone to generate a howling phenomenon. That is, the user's voice signal output to the speaker is reflected by the cover part and input again to the microphone, and thus resonates at a specific frequency and is output to the speaker so that the low frequency oscillation sound of 'boo ~ woo', 'beep' is very loud. The sound will continue to ring.

Accordingly, it is an object of the present invention to provide a microphone input volume control system that prevents howling from occurring as the separation distance between the cover portion and the main body of a portable computer becomes smaller.

1 is an operational state diagram of a cover part of a portable computer to which a microphone input volume adjusting system according to the present invention is applied;

2 is an exploded perspective view of the portable computer of FIG.

3 is a control block diagram of a microphone input volume adjusting system according to the present invention;

4 is a graph showing the correlation between the operation of the cover portion of the microphone input volume control system of Figure 3 and the microphone input volume,

5 is a perspective view of a conventional portable computer,

6 is a control block diagram of a microphone input system of a conventional portable computer.

* Explanation of symbols for the main parts of the drawings

1: portable computer 3: body

5 cover part 7 display unit

9: keyboard 10: touch pad

12: speaker 14: microphone

20: hinge portion 22: hinge pin

24: hinge pin receiving portion 30: hinge coupling portion

50: audio circuit section 52: input volume control circuit

54: Volume Control Knob 56: Volume Signal Line

58: cover position detection unit 60: knob receiving groove

According to the present invention, the object of the present invention is a plate-shaped computer main body, a microphone and a speaker provided in the front portion of the main body, an audio circuit unit for outputting a microphone input signal input from the microphone to the speaker, and an upper portion of the main body. A microphone input volume control system of a portable computer including a cover part freely rotatably coupled to the microphone input volume control system, the cover position sensing part outputting a volume control signal in association with a rotation of the cover part; And an input volume control unit configured to increase or decrease the volume of the microphone input signal inputted from the microphone to the audio circuit unit according to the volume control signal from the cover position detecting unit. Achieved by the system.

The cover position detecting unit preferably outputs a volume reduction signal such that the volume of the microphone input signal decreases as the angle between the cover portion and the main body decreases.

The cover part and the hinge part are protruded upward from the plate surface of the main body and provided in the hollow hollow shaft shape, the receiving hole provided in the cover part, the hinge of the main body and the receiving hole of the cover part. A hinge pin for enabling free rotation between the bodies; The cover position detecting unit is installed in at least one region of the hinge pin and has the same rotation axis as the rotation axis of the hinge pin to rotate in conjunction with the rotation of the hinge pin, volume control to output the volume control signal according to the rotation state It is possible to include a knob.

Here, the input volume control unit is interposed on a power line branched from a power line for transmitting the microphone input signal to the audio circuit unit to adjust the current amount of the microphone input signal according to the volume control signal from the volume control knob. It is possible to include a variable resistor.

The volume control knob is implemented to output a volume reduction signal to reduce the volume of the microphone input signal in conjunction with the rotation of the hinge pin, when the hinge pin rotates in the direction in which the cover portion is folded with the main body. Can be.

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

1 is an operational state diagram of a cover part of a portable computer to which a microphone input volume adjusting system according to the present invention is applied, and FIG. 2 is an exploded perspective view of the portable computer of FIG. 1.

As shown in these figures, the portable computer 1 to which the microphone input volume adjusting system according to the present invention is applied can be folded on a plate-shaped computer main body 3 in which various hardware modules are incorporated and on the upper part of the main body 3. It has a cover portion 5 coupled to it.

On the upper surface of the main body 3, a microphone 14 and a speaker 12 are provided together with a keyboard 9 for typing input work and a touch pad 10 which is a pointing input means. In the rear region, which is in contact with the cover part 5 of the main body 3, the hinge engaging part 30 is provided together with the hinge engaging part 30 for coupling the main body 3 and the cover part 5 to be rotatable. The volume adjusting knob 54 for outputting a volume control signal is accommodated in the receiving groove 60 according to the operating state.

The hinge coupling part 30 is accommodated in the hinge part 20 provided in the main body 3, the hinge accommodating part 24 provided in the cover part, and the hinge part 20 and the hinge accommodating part 24. Hinge pin 22 is included.

The hinge parts 20 are provided in pairs on both sides of the rear region of the main body 3 and protrude upward from the plate surface to provide hollow hollow shaft shapes. The hinge pin 22 is accommodated in the hinge portion 20. The hinge pin 22 is rotatably coupled to the hinge pin receiving portion 24 of the cover portion 5 to enable free rotation between the cover portion 5 and the main body 3.

On the other hand, at one end of the hinge pin 22, a volume control knob 54 having the same rotation axis as that of the hinge pin 22 and rotating in conjunction with the rotation of the hinge pin 22 is mounted. The volume control knob 54 rotates together with the hinge pin 22 to apply a different volume control signal according to the rotation direction to the input volume control circuit to be described later through the volume signal line 56.

The cover portion 5 is provided with a display portion 7 for displaying an image, and displays a video signal from the computer main body 3 on the display portion 7. Such a cover portion 5 can be freely rotated at any position between the A position which shields the front part of the main body 3 and the B position which is a position for use of a computer.

Therefore, the user can use the voice input function in a state in which the microphone 14 and the speaker 12 are exposed by rotating and opening the cover part 5 from the main body 3. In addition, since the volume adjusting knob 54 rotates in conjunction with the rotation of the hinge pin 22 according to the opening of the cover part 5, different volume control signals are output depending on the opening position of the cover part 5. .

3 is a control block diagram of a microphone input volume control system according to the present invention. As shown in the figure, the microphone input volume control system according to the present invention, the cover position detecting unit 58 for outputting a volume control signal according to the position of the microphone 14 and the cover unit 5 for the user's voice input. And an input volume control circuit 52 for adjusting the volume of the signal input from the microphone 14 according to the detection signal from the cover position detecting unit 58, and the volume is adjusted through the input volume control circuit 52. And an audio circuit unit 50 for transmitting the microphone input signal mic_in through the speaker 12.

The cover position detecting unit 58 transmits a volume control signal for reducing the volume of the microphone input signal mic_in as the opening and closing angle decreases according to the opening and closing angle of the cover portion 5 from the computer body 3. As a method of detecting the opening and closing angle, a sensor for detecting the rotation of the cover part 5 is used, or a pair of sensors are installed between the cover part 5 and the computer main body 3 to detect the mutual separation distance. Several techniques can be used.

In the following description, the cover position detecting unit 58 detects the position of the cover unit 5 through the rotation of the hinge pin 22 according to the opening of the cover unit 5, and the rotation of the hinge pin 22. By providing the interlocking volume control knob 54, it will be illustrated that different volume control signals are output according to the open position of the cover (5).

At one end of the hinge pin 22, a volume control knob 54 having a same rotation axis as that of the hinge pin 22 and rotating in conjunction with the rotation of the hinge pin 22 is mounted. The volume control knob 54 rotates together with the hinge pin 22 to apply a different volume control signal according to the rotation direction to the input volume control circuit to be described later through the volume signal line 56.

The volume control knob 54 is mounted at one end of the hinge pin 22 to rotate together with the hinge pin 22 with the same axis of rotation as the hinge pin 22. The hinge pins 22 rotate in different directions depending on whether the cover portion 5 is opened or closed. Therefore, when the hinge pin 22 rotates in the direction in which the cover portion 5 is opened, and when the hinge pin 22 rotates in the closed direction, the kind of the volume signal output from the volume control knob 54 also varies.

Here, when the cover portion 5 is opened to the maximum (A position), the volume control knob 54 outputs a volume increase signal for increasing the volume of the microphone input signal mic_in, and opens and closes the cover portion 5. As the angle decreases (B-> C-> A position), a volume decrease signal for reducing the volume of the microphone input signal mic_in is output.

That is, the volume adjusting knob 54 is linked to the rotation of the hinge pin 22, so that the hinge pin 22 rotates in a direction in which the cover portion 5 is separated from the main body 3 (A-> C-). > B position) outputs the volume increase signal, and outputs the volume decrease signal when the hinge pin 22 rotates in the direction in which the cover part 5 is folded with the main body 3 (B-> C-> A position). can do.

The input volume control circuit 52 adjusts the input volume of the microphone input signal mic_in to the audio circuit unit 50 according to the volume control signal input from the volume control knob 54. The input volume control circuit 52 is branched from a power line applying the microphone input signal mic_in signal input through the microphone 14 to the audio circuit unit 50 to adjust the amount of current of the microphone input signal mic_in signal. Resistor VR. Accordingly, the volume of the microphone input signal mic_in signal is adjusted by changing the resistance value of the variable resistor VR from the volume control signal output from the volume control knob 54.

Accordingly, the microphone input signal mic_in input to the audio circuit unit 50 through the input volume control circuit 52 is separated from the main body 3 by the maximum angle (A position). The volume of the microphone input signal mic_in input to the circuit unit 50 becomes maximum, and as the angle between the cover unit 5 and the main body 3 becomes smaller (B-> C-> A position), the audio circuit unit ( The volume of the microphone input signal mic_in input to 50 is reduced.

The relationship between the volume of the microphone input signal mic_in according to the angle formed by the cover part 5 and the main body 3 may be represented as shown in the graph of FIG. 4. As can be seen from the graph, as the angle of the cover portion 5 is increased, the input volume of the microphone 14 is gradually increased.

The audio circuit unit 50 outputs the microphone input signal mic_in adjusted through the input volume control circuit 52 through the speaker 12. Therefore, when the microphone input signal mic_in having the maximum volume is input to the audio circuit unit 50, the volume of the voice signal transmitted through the speaker 12 is increased, and the volume of the microphone input signal mic_in is increased. In a small case, the volume of the voice signal transmitted to the speaker 12 through the audio circuit unit 50 is also reduced.

That is, when the cover part 5 is completely open (A position), and the cover part 5 is spaced apart from the main body 3 at the maximum angle, the microphone input signal mic_in is maximized and is transmitted to the speaker 12. The volume of the audio signal is also maximized, and as the angle between the cover part 5 and the main body 3 becomes smaller (B-> C-> A position), the microphone input signal mic_in is reduced to the speaker 12. The volume of the sound signal transmitted is reduced.

Accordingly, when the angle between the cover part 5 and the main body 3 decreases, the microphone input signal mic_in decreases and the volume of the voice signal transmitted to the speaker 12 also decreases. The howling phenomenon that occurs when the voice signal outputted from the microphone 14 is input again to the microphone 14 can be prevented.

As described above, the present invention recognizes the opening state of the cover part by detecting the rotation of the hinge part, and decreases the volume of the microphone input signal as the angle formed by the cover part decreases, so that the volume of the signal transmitted to the speaker is reduced. Thus, the howling phenomenon that occurs when the voice signal output from the speaker is input to the microphone can be prevented.

As described above, according to the present invention, there is provided a microphone input volume control system for preventing the howling phenomenon that occurs as the separation distance between the cover portion and the main body of the portable computer is small.

Claims (5)

A computer body having a plate shape, a microphone and a speaker installed at the front part of the main body, an audio circuit part for outputting a microphone input signal input from the microphone to the speaker, and a cover part freely coupled to an upper part of the main body. In the microphone input volume control system of a portable computer comprising, A cover position detecting unit for outputting a volume control signal in association with the rotation of the cover unit; And an input volume control unit configured to increase or decrease the volume of the microphone input signal inputted from the microphone to the audio circuit unit according to the volume control signal from the cover position detecting unit. system. The method of claim 1, And the cover position detecting unit outputs a volume reduction signal to reduce the volume of the microphone input signal as an angle between the cover unit and the main body decreases. The method of claim 1, A hinge part protruding upward from the plate surface of the main body to have an hollow hollow shaft shape, an accommodation hole provided in the cover part, a hinge hole of the main body and an accommodation hole of the cover part, and between the cover part and the main body. A hinge pin for enabling free rotation; The cover position detecting unit is installed in at least one region of the hinge pin and has the same rotation axis as the rotation axis of the hinge pin to rotate in conjunction with the rotation of the hinge pin, volume control to output the volume control signal according to the rotation state Microphone input volume control system of a portable computer comprising a knob. The method of claim 3, wherein The input volume control unit is a variable resistor interposed on a power line branched from a power line for transmitting the microphone input signal to the audio circuit unit to adjust the amount of current of the microphone input signal according to the volume control signal from the volume control knob. Microphone input volume control system comprising a. The method of claim 3, wherein The volume control knob, when the hinge pin rotates in the direction in which the cover portion is folded with the main body, in conjunction with the rotation of the hinge pin, outputs a volume reduction signal for reducing the volume of the microphone input signal A microphone input volume control system for a portable computer.