KR19980058823A - Microphone signal control device and method for optical disc player - Google Patents

Abstract

The present invention relates to a microphone signal control device and method for an optical disc player, comprising: a low pass filter (LPF) 210 for low pass filtering an input signal provided from a microphone 5 to remove a direct current (DC) component; Analog / Digital (A / D) converter 220 for converting the output signal of the LPF 210 into a digital signal and the output signal of the A / D converter 220 are compared with a preset reference signal to output the comparison signal. A comparator 230, a microcomputer 240 for generating a switching control signal according to the comparison signal provided from the comparator 230, and a first amplifier for amplifying the output signal of the LPF 210 with a predetermined amplification degree. And a second amplifying unit 260 for amplifying the signal amplified by the first amplifying unit 250 again to a predetermined amplification level, and a first amplifying unit switched according to a switching control signal provided from the microcomputer 240. First switching unit 255 for passing or blocking the output signal of the unit 250 And a second switching unit 265 which is switched according to a switching control signal provided from the microcomputer 240 to pass or block the output signal of the second amplifying unit 250, wherein the microphone is 'on'. If the audio signal is not input from the microphone or only the noise signal is input, the amplified part does not output the amplified signal, thereby eliminating user's discomfort due to the signal amplified and output by the internal or external noise signal. It has an effect.

Description

Microphone signal control device and method for optical disc player

The present invention relates to an apparatus and method for controlling a microphone signal of an optical disk player, and more particularly, to an apparatus for controlling a microphone signal of an optical disk player capable of preventing noise signals from being output through a speaker by efficiently controlling a signal input from a microphone; It is about a method.

With the development of audio and video media, optical disc players for recording and reproducing video and audio data on semi-permanent optical discs have been developed.

Such an optical disc player reproduces an image and / or audio recorded on an optical disc and outputs it through a screen and / or a speaker, and has a higher signal-to-noise ratio than conventional image and / or audio reproducing apparatus, resulting in better image quality and / or Or it can reproduce the signal with sound quality, it does not generate noise due to irregular reproduction and modulation, very low distortion, no ghost and random access, so it is rapidly developed and widely distributed. There is a trend.

In addition, such an optical disk player includes a compact disk player (CDP), a laser disk player (LDP), a compact disk graphic player (CDGP), and a video compact disk player (VCDP: video compact disk player) has been developed and widely used. Also, recently, a digital video disk (DVD) using MPEG-2 moving picture compression technology and a digital video disk player for playing the same have been developed. It can record and play back gigabytes (GB) of data including moving images on a 12cm optical disc such as a CD, and it is also designed to be compatible to play current CDs and VCDs.

1 is a schematic block diagram of a conventional optical disc player as described above.

As shown in FIG. 1, an optical disc player for carrying out the present invention includes a pickup and actuator unit 10, an RF (radio frequency) signal amplification and servo signal processor 20, a motor and motor driver 30, and a key input unit. 40, the microcomputer 50, the digital signal processor 60, the MPEG decoder 70, the audio signal processor 80, the video signal processor 90, the speaker 100, and the screen 110.

The key input unit 40 provides the microcomputer 50 with a function key signal for causing the optical disk player configured as described above to execute a predetermined function, that is, a function key signal input by the user by pressing a predetermined function key.

The microcomputer 50 generates control signals corresponding to the function key signal provided from the key input unit 40 to the respective constituent members so that a predetermined function input from the key input unit 40 is executed.

The pickup and actuator unit 10 performs an optical pickup from a disc loaded in a disc tray (not shown), and outputs the RF signal read out to the RF signal amplification and servo signal processing unit 20 accordingly.

In addition, the motor and the motor driving unit 30 drive the spindle motor (not shown) to rotate the disk and drive the actuator unit 10 so that the pickup unit 10 performs optical pickup to read data recorded on the disk. To output as a read RF signal.

The RF signal amplification and servo signal processing unit 20 amplifies the RF signal provided from the pickup and actuator unit 10 and provides a servo control signal according to the signal to the motor and the motor driving unit 30 to provide the focus servo and the tracking servo. To be done.

The digital signal processor 60 digitally processes the amplified RF signal provided from the RF signal amplification and servo signal processor 20 and performs error detection and error correction, and then outputs the signal to the MPEG decoder 70. do.

The MPEG decoder 70 decodes an error corrected digital video signal and an audio signal provided from the digital signal processor 60 based on the MPEG compression format and outputs the decoded video signal to the video signal processor 90 and the audio signal processor 80. .

The audio signal processing unit 80 and the video signal processing unit 90 process the decoded audio and video signals provided from the MPEG decoder 70 and output them to the speaker 100 and the screen 110, respectively. And the screen 110 are displayed as an audio and an image, respectively.

On the other hand, the microphone 5 provides a predetermined voice signal input by the user. When the microphone 5 is turned on and the user's voice signal is input, the microphone 5 provides the voice signal to the amplifier 7. The amplifier 7 amplifies the audio signal provided from the microphone 5 to a predetermined level and outputs the audio signal to the audio signal processor 80.

The audio signal processor 80 not only processes the audio signal reproduced from the disc as described above, but also processes the audio signal amplified by the amplifier 7 through the microphone 5 and outputs the audio signal to the speaker 100. In particular, when performing the song accompaniment function in the optical disc player, the user's voice signal provided through the microphone 5 and the reproduced audio signal are mixed and output to the speaker 100.

That is, when the song accompaniment function is executed, the audio signal processor 80 removes an audio signal of a predetermined frequency band, that is, a 200Hz to 2KHz band corresponding to a human voice signal from the reproduced audio signal through band pass filtering, and the frequency band The user's voice signal input from the microphone 5 is mixed and output to the speaker 60. When there is no audio signal to be reproduced, only the user's voice signal through the microphone 5 is processed and output.

However, a signal input through the microphone 5 of the conventional optical disc player is amplified by the amplifier 7 to a predetermined level and provided to the audio signal processor 80. After the microphone 5 is turned on, Even when the user's voice signal is not input, the external noise and internally generated noise signal are amplified and output to a predetermined level, so that even when the user does not input the voice signal, a predetermined level is provided through the speaker 100. There was a problem that the noise signal amplified by may give an inconvenience to the user.

Accordingly, the present invention has been made to solve the above-mentioned problems in the related art, and an object of the present invention is to 'turn on' the microphone in the optical disc player and use the microphone, which may occur even when the user does not input a voice signal. An apparatus and method for controlling a microphone signal of an optical disc player to remove a noise signal is provided.

According to a preferred embodiment of the present invention for achieving the above object, in the apparatus for controlling the signal input through the microphone in the optical disk player, low-pass filtering the signal input through the microphone to remove the DC component A low pass filter unit for outputting a second signal; a first amplifier for amplifying and outputting an output signal of the low pass filter unit to a predetermined level; and a second amplifier for amplifying and outputting the signal amplified by the first amplifier unit to a predetermined level again; An analog / digital (A / D) converter for converting an output signal of the amplifying unit, the low pass filter unit into a digital signal, and a signal provided by converting the digital signal from the A / D converter to a preset reference signal and its level. A comparison unit for comparing and outputting a comparison signal according thereto, and a switching control signal according to the comparison signal provided from the comparison unit A first switching unit which is connected in series with the generated microcomputer and an output terminal of the first amplifier unit and is switched according to a switching control signal provided from the microcomputer to pass or block the output signal of the first amplifier unit, and the second amplifier unit; And a second switching unit connected in series with an output terminal and switched according to a control signal of the microcomputer to pass or block an output signal of the second amplifying unit.

According to another preferred embodiment of the present invention for achieving this object, in a method for controlling a signal input through a microphone in an optical disc player, (A) when the microphone is 'on' signal input through the microphone Detecting (b) for a predetermined time; (b) comparing the microphone input signal detected for a predetermined time in step (a) with a reference signal of a predetermined level; In the step), if the detected level of the microphone input signal is less than the level of the preset reference signal, the microphone input signal is not amplified and outputted. And (d) repeating steps (a) to (c) until the microphone is 'off'. .

1 is a schematic block diagram of a conventional optical disc player

2 is a block diagram of an apparatus for controlling a microphone signal of an optical disk player according to an exemplary embodiment of the present invention.

3 is a flowchart of a microphone signal control method of an optical disc player according to another preferred embodiment of the present invention.

<Description of the code | symbol about the principal part of drawing>

5: microphone 10: pick-up and actuator unit

20: RF signal amplification and servo signal processing unit

30: motor and motor drive unit 40: key input unit

50,240: microcomputer 60: digital signal processing unit

70: MPEG decoder 80: Audio signal processor

90: video signal processing unit 100: speaker

110: screen 210: LPF

220: A / D converter 230: comparison

250: 260: amplification part 255, 265: switching part

OP: Operational Amplifier R: Resistance

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

2 is a block diagram illustrating an apparatus for controlling a microphone signal of an optical disc player according to an exemplary embodiment of the present invention.

As shown in FIG. 2, the apparatus for controlling a microphone signal of an optical disc player according to the present invention includes a low pass filter (LPF) 210 for low-pass filtering an input signal provided from the microphone 5 to remove a direct current (DC) component. ) And an output signal of the analog / digital (A / D) converter 220 for converting the output signal of the LPF 210 into a digital signal, and the output signal of the A / D converter 220 with a preset reference signal. A comparator 230 for outputting a signal, a microcomputer 240 for generating a switching control signal according to the comparison signal provided from the comparator 230, and an amplifying output signal of the LPF 210 with a predetermined amplification degree. The first amplification unit 250, the second amplification unit 260 for amplifying the signal amplified by the first amplification unit 250 again to a predetermined amplification, and is switched according to the switching control signal provided from the microcomputer 240 First switch to pass or block the output signal of the first amplifier 250 And a second switching unit 265 which is switched according to a switching control signal provided from the microcomputer 240 to pass or block the output signal of the second amplifying unit 250.

The LPF 210 low-pass filters the input signal provided through the microphone 5 after the microphone 5 is 'on' by the user to remove direct current (DC) components, that is, noise components. It provides to the 220 and the first amplifier 250.

The A / D converter 220 converts an analog audio signal provided through the LPF 210 into a digital signal and provides it to the comparator 230. Accordingly, the comparator 230 compares the digital audio signal provided from the A / D converter 220 with a reference signal having the same level as the preset reference signal level, that is, the same level as the maximum noise signal level that can be inputted, and compares the level. Outputs a signal. If the level of the digital audio signal provided from the A / D converter 220 is greater than the level of the preset reference signal, the high signal is provided to the microcomputer 240; Provided at 240.

The microcomputer 240 provides the switching control signals according to the 'high' or 'low' comparison signals provided from the comparator 230 to the first and second switching units 255 and 265. When the 'high' signal is provided, the microcomputer 240 generates a control signal for the first and second switching units 255 and 265 to switch 'on', that is, the switch is connected, respectively. If provided, the first and second switching units 255 and 265 generate a control signal to switch 'off', that is, to open the switch, respectively.

In addition, the first amplifier 250 is connected between the operational amplifier OP1 and the resistor R1 connected to the negative input terminal of the operational amplifier OP1, and between the negative input terminal and the output terminal. The resistor R2 is configured to amplify the output signal of the LPF 210 by a predetermined amplification degree, that is, the amplification gain, wherein the amplification gain is determined by the resistance value of the resistor R1 and the resistance value of the resistor R2. Is determined by That is, the amplification degree of the first amplifier 250 is determined in proportion to the value R2 / R1 obtained by dividing the resistor R2 by the resistor R1.

The first switching unit 255 is connected in series to the output terminal of the operational amplifier OP1 constituting the first amplifier 250, and according to the control signal provided from the microcomputer 240, the switch 'on' or 'off' To pass or block the output signal of the first amplifier 250.

The second amplifier 260 is connected between the operational amplifier OP2 and the resistor R3 connected to the negative input terminal of the operational amplifier OP2, and between the negative input terminal and the output terminal. In addition to the resistor R4, a variable resistor Rv connected in parallel with the resistor R3 is further provided. Therefore, the amplification gain of the second amplifier 260 is determined in proportion to the resistor R3 and the resistor R4 and is variable by the variable resistor Rv, which is generally a volume switch. switch (not shown) to adjust the amplification gain of the second amplifier 260 by varying the resistance value by a user's manipulation. That is, the second amplifying unit 260 amplifies the signal amplified by the first amplifying unit 250 again at a predetermined amplification degree, that is, the amplification degree determined by being adjusted by the resistance value of the variable resistor Rv, and thereby the audio signal processing unit Provided by 80.

The second switching unit 265 is connected in series to the output of the operational amplifier (OP2), the switch 'on' or 'off' in accordance with the control signal provided from the microcomputer 240 is the output of the second amplifier 250 Pass or block the signal.

On the other hand, the operation of the microphone signal control apparatus of the optical disk player according to the present invention configured as described above is as follows.

First, when a predetermined audio signal is input through the microphone 5 after the microphone 5 is 'on' by the user, the LPF 210 low-pass filters the input audio signal to the A / D converter 220. to provide.

Accordingly, the A / D converter 220 converts an audio signal provided through the LPF 210 into a digital signal and provides the converted signal to the comparison unit 230, and the comparison unit 230 receives a predetermined value from the A / D converter 220. Detects the average level of the digital audio signal provided for a period of time and compares it with a preset reference level signal, that is, the maximum noise signal level that can be input, and outputs a 'high' or 'low' signal to the microcomputer 240 accordingly. If the predetermined signal is greater than the preset reference signal level, the user inputs a predetermined voice signal. Therefore, the user outputs a 'high' signal. If it is smaller than the preset reference signal level, the noise signal or the signal is not input. A low 'signal is output to the microcomputer 240.

Then, when the 'high' signal is provided from the comparator 230, the microcomputer 240 generates a control signal and switches the first and second switching units 255 and 265 to be switched 'on', that is, to 'low'. When a signal is provided, a control signal is generated to switch 'off', that is, open the first and second switching units 255 and 265.

When the first and second switching units 255 and 265 are switched 'on' by the control signal of the microcomputer 240, that is, when a voice signal of a normal user is provided through the microphone 5, the first and second switches may be used. The amplifiers 250 and 260 amplify and output audio signals input through the microphone 5 with a predetermined amplification gain. On the contrary, when the first and second switching units 255 and 265 are switched 'off' by the control signal of the microcomputer 240, that is, a predetermined voice signal is not provided through the microphone 5 or a noise signal may be provided. In this case, since the first and second amplifiers 250 and 260 are open, the audio signal input through the microphone 5 is not output.

As a result, when a voice signal by a user is not input from the microphone 5, output signals of the first and second amplifiers 255 and 265 are blocked, and thus the amplified noise signal generated by external and internal influences is a speaker. It is not output through 100.

3 is a flowchart illustrating a method of controlling a microphone signal of an optical disc player according to another exemplary embodiment of the present invention.

In step S10, it is determined whether the microphone 5 is 'on'. When it is determined in step S10 that the microphone 5 is 'on' by the user, in step S20, a signal input through the microphone 5 is detected for a predetermined time.

Thereafter, in step S30, the average level of the microphone 5 input signal detected for the predetermined time set in step S20 is compared with the reference signal of the preset level, so that the average level of the microphone input signal is the preset reference signal. If it is greater than or equal to the level, the process proceeds to step S40, and if the level is small, the process proceeds to step S50.

When the process proceeds from step S30 to step S40, in step S40, the microcomputer 240 switches on the first and second switching units 255 and 265 so that the input signal through the microphone 5 is first and second. The second amplifiers 250 and 260 amplify and output a predetermined level, and the process proceeds to step S60. On the other hand, if proceeding from step S30 to step S50 in step S50 in the microcomputer 240 by the switch 'off' the first and second switching unit 255, 265 so that the microphone input signal is not amplified and outputted As in step S40, the process proceeds to step S60.

Thereafter, in step S60, it is determined whether the microphone 5 is 'off', where the flow ends if the microphone 5 is 'off', and if the microphone 5 is not 'off', the microphone 5 Steps S20 to S60 are repeated until is 'off'.

As described above, the present invention, when using the microphone in the optical disk player, when the audio signal is not input from the microphone after the microphone is 'on', or outputs the amplified signal from the amplifier if only a noise signal is input. By doing so, the user's discomfort caused by the signal amplified and output by the internal or external noise signal can be removed.

Claims (5)

An apparatus for controlling a signal input through a microphone 5 in an optical disc player, A low pass filter 210 for low pass filtering the signal input through the microphone 5 to remove a DC component and outputting the low pass filter; A first amplifier 250 for amplifying and outputting the output signal of the low pass filter 210 to a predetermined level; A second amplifier 260 for amplifying and outputting the signal amplified by the first amplifier 250 to a predetermined level; An analog / digital (A / D) converter 220 for converting an output signal of the low pass filter 210 into a digital signal; A comparator 230 for comparing the level of the signal provided after being converted into digital by the A / D converter 220 with a preset reference signal and outputting a comparison signal according thereto; A microcomputer 240 generating a switching control signal according to a comparison signal provided from the comparison unit 230; A first switching unit connected in series with an output terminal of the first amplifying unit 250 and switched according to a switching control signal provided from the microcomputer 240 to pass or block an output signal of the first amplifying unit 250 ( 255); A second switching unit 265 connected in series with an output terminal of the second amplifying unit 260 and switched according to a control signal of the microcomputer 240 to pass or block an output signal of the second amplifying unit 260. Microphone signal control device of the optical disk player including. The method of claim 1, wherein the microcomputer 240 receives the first and the second signals when the comparison signal is provided when the level of the input signal of the microphone 5 is greater than the preset reference signal level from the comparator 230. Generating a control signal to cause the second switching units 255 and 265 to be 'on' so that the first and second switching units 255 and 265 pass the output signals of the first and second amplifiers 250 and 260. A microphone signal control device for an optical disc player. 2. The method of claim 1, wherein the microcomputer 240 receives the first comparison signal when the level of the input signal of the microphone 5 is less than or equal to the preset reference signal level from the comparison unit 230. And generating a control signal to switch off the second switching units 255 and 265 so that the first and second switching units 255 and 265 block the output signals of the first and second amplifiers 250 and 260. Microphone signal control device for an optical disc player, characterized in that. The apparatus of claim 1, wherein the level of the reference signal preset in the comparing unit is a maximum level of a noise signal inputtable. A method for controlling a signal input through a microphone 5 in an optical disc player, (A) detecting a signal input through the microphone for a predetermined time when the microphone 5 is 'on'; (B) comparing the microphone input signal detected for a predetermined time in step (a) with a reference signal of a predetermined level; (C) If the level of the detected microphone input signal in step (b) is less than the level of the preset reference signal, the microphone input signal is not amplified and outputted. Amplifying and outputting at a level; (D) repeating steps (a) to (c) until the microphone (5) is 'off'.