KR101866162B1 - Acoustic preamplifier device witn dual channel buzzer system - Google Patents

Acoustic preamplifier device witn dual channel buzzer system Download PDF

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Publication number
KR101866162B1
KR101866162B1 KR1020180026126A KR20180026126A KR101866162B1 KR 101866162 B1 KR101866162 B1 KR 101866162B1 KR 1020180026126 A KR1020180026126 A KR 1020180026126A KR 20180026126 A KR20180026126 A KR 20180026126A KR 101866162 B1 KR101866162 B1 KR 101866162B1
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South Korea
Prior art keywords
acoustic
sound
noise
string instrument
signal
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KR1020180026126A
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Korean (ko)
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김남운
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김남운
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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
    • G10H3/00—Instruments in which the tones are generated by electromechanical means
    • G10H3/12—Instruments in which the tones are generated by electromechanical means using mechanical resonant generators, e.g. strings or percussive instruments, the tones of which are picked up by electromechanical transducers, the electrical signals being further manipulated or amplified and subsequently converted to sound by a loudspeaker or equivalent instrument
    • G10H3/14—Instruments in which the tones are generated by electromechanical means using mechanical resonant generators, e.g. strings or percussive instruments, the tones of which are picked up by electromechanical transducers, the electrical signals being further manipulated or amplified and subsequently converted to sound by a loudspeaker or equivalent instrument using mechanically actuated vibrators with pick-up means
    • G10H3/18—Instruments in which the tones are generated by electromechanical means using mechanical resonant generators, e.g. strings or percussive instruments, the tones of which are picked up by electromechanical transducers, the electrical signals being further manipulated or amplified and subsequently converted to sound by a loudspeaker or equivalent instrument using mechanically actuated vibrators with pick-up means using a string, e.g. electric guitar
    • G10H3/186—Means for processing the signal picked up from the strings
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
    • G10K9/12—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated
    • G10K9/122—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated using piezoelectric driving means
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/005—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements using switched capacitors, e.g. dynamic amplifiers; using switched capacitors as resistors in differential amplifiers

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Electrophonic Musical Instruments (AREA)

Abstract

The present invention relates to an acoustic preamplifier device capable of amplifying and outputting sound made from an acoustic stringed instrument. The acoustic preamplifier device includes: a body including a mainboard for stably operating and controlling the acoustic preamplifier device, and located in the bottom of the body of the acoustic stringed instrument; a connection jack part electrically connected to the mainboard, and used for connection with an extra amplifier; a piezo buzzer generating an electric signal sound for the sound made from the acoustic stringed instrument; a control module located on the edge of a sound hole part near the body of the acoustic stringed instrument; and a transducer located on the lower side of a saddle part installed on the upper surface of a bridge part near the body. As such, the present invention is capable of more precisely generating an electric signal sound, and properly delivering clear classic sound made from the acoustic stringed instrument.

Description

TECHNICAL FIELD [0001] The present invention relates to an acoustic preamplifier apparatus having a dual channel buzzer system,

The present invention relates to an acoustic preamplifier apparatus having a dual channel buzzer system mounted on an acoustic string instrument such as a guitar or a ukulele, To an acoustic preamplifier device having a dual channel buzzer system that allows the sound to be converted into a richer sound.

In general, acoustic instruments such as guitars and ukulele are stringed instruments that perform their own tone only by amplifying the vibration of the strings through the bass of the body without a separate electrical device .

However, when an acoustic musical instrument is played at a venue or the like, it is necessary to use an output device such as an amplifier that directly amplifies the original sound of the acoustic musical instrument because the sound is small only by the acoustic sound of the acoustic musical instrument.

As a typical method of amplifying the output of the conventional acoustic instrument, there is a method of mounting a microphone near the sound hole of the body. This method is inconvenient because the performance is restricted due to the mounting of the microphone. In addition to the noise from the instrument, There is a limit to output the original sound output from a musical instrument. In order to prevent such a noise from being output to a sound other than the original sound, it is necessary to use a more accurate sound-receiving microphone. There is a limit.

Accordingly, there is a need for a technique for transmitting the original tone color of an acoustic musical instrument as it is, and a pickup apparatus is used as a device for realizing this.

The pickup device converts a vibration of a string of an acoustic musical instrument into an electric signal and outputs the electric signal. The pick-up device has been proposed in various ways according to the current operation mode or mounting form.

As an example of the use of an acoustic guitar, a piezo pickup, which is mounted on a saddle bridge to convert the vibration of an electric string to an electrical signal, and a pickup used for an electric guitar, A magnetic sound hole pickup for amplifying and outputting sound through a change in magnetic field according to a vibration of a string, a vibrating type pickup for converting a vibration transmitted to a head of a body or neck of the other body into an electric signal and outputting .

Korean Patent Publication No. 10-1397418 Korean Patent Publication No. 10-2013-0042096

SUMMARY OF THE INVENTION The present invention has been made in view of the foregoing problems and it is an object of the present invention to provide an acoustic preamplifier having a dual channel buzzer system for transmitting a distinctive clear sound of an acoustic string as it is, The purpose of the device is to provide.

In the present invention, by using a dual channel buzzer system, it is possible to convert a sound to be played when playing an acoustic string to an electrical signal and output it. The present invention provides an acoustic preamplifier apparatus having a dual channel buzzer system.

It is an object of the present invention to provide an acoustic preamplifier apparatus having a dual channel buzzer system capable of transmitting a sound played through an acoustic string instrument to a clean signal output without noise.

In order to accomplish the above object, the present invention provides an acoustic preamplifier apparatus having a dual channel buzzer system, which is mounted on a body of an acoustic string instrument including a guitar and an aculla, The main preamplifier comprising: a body having a main board for performing stable operation and control of the acoustic preamplifier, the body being positioned at a lower side of a body of the acoustic string instrument; A connecting jack portion which is fixed to the main body so as to be protruded from the main body while being supported and coupled to the main body and fixed to the lower side of the body of the acoustic string instrument and electrically connected to the main board and connected to another amplifier device; A piezo buzzer that is connected to a first connection line electrically connected to the main board and has a pair of dual configurations and is attached inside the body of the acoustic string to generate an electrical signal for the sound played in the acoustic string; A control module connected to a second connection line electrically connected to the main board and adapted to adjust a volume of a master volume, a tone, and the piezo buzzer, and positioned at an edge of the sound hole of the body side of the acoustic string instrument; And a third connecting line electrically connected to the main board and fixed to the inside of the body of the acoustic string instrument so that the sound transmitting force is most excellent for the sound played in the acoustic string instrument, And a dual channel buzzer system having a pair of dual-configuration piezo buzzer for transmitting a unique clear sound while playing the acoustic string instrument, So that the sound can be converted into a rich sound to be heard.

Here, the two pairs of piezoelectric buzzer, which are dual configurations, can be configured to be positioned close to the bridge portion on the body side of the acoustic string instrument, thereby enhancing the sensitivity to the most audible sound and the response to the performance sound.

Here, it is preferable that the above-mentioned two pairs of piezo buzzer are placed on both sides below the body-side bridge of the acoustic string instrument, and are spaced from each other and positioned on the same horizontal line.

Here, the transducer may include a bar-shaped metal body that is fixedly disposed inside the body of the acoustic string instrument, a slot formed on the bottom surface of the bridge body side, and a bar-shaped metal body inserted and fixed in the slot .

Here, each of the two pairs of piezo-electric buzzer is connected to the first connection line and includes a diaphragm for generating an electrical signal by vibration due to tremble when the acoustic string is played; A protective case into which the diaphragm is inserted; And a double-sided tape attached to one side of the protective case for fixing the side of the acoustic string to the body, wherein the protective case is formed to have a double wall structure around the edges, And an outer wall inserted into between the double walls of the outer case so as to allow the diaphragm to be seated and disposed, and a central hole is formed with respect to the body-side attachment surface, So that the vibration of the diaphragm can be transmitted to the diaphragm.

Here, the main board of the main body is equipped with a microcomputer that receives inputs from the piezo buzzer, the control module, and the transducer and outputs an output to a separate amplifier device connected to the acoustic preamplifier device through the control and connection jacks ; And a signal processing unit connected to each output terminal of the piezo buzzer, the control module, and the transducer so as to allow an accurate signal input to the microcomputer, wherein the signal processor includes a first capacitor, a first resistor and a second diode sequentially A serial connection; Further comprising a noise detector connected to an output terminal of the microcomputer for detecting noise from an output signal and a noise eliminator for removing noise from the noise detector when the noise is detected, wherein the noise detector detects a noise signal The second capacitor is connected to the first capacitor, and the second capacitor is connected to the third capacitor through the second capacitor, and the second capacitor is connected to the third capacitor through the second capacitor. Compares the output voltage of the comparator with a fourth capacitor to charge and discharge the voltage to the noise eliminator; Wherein the noise eliminator amplifies the output of the noise detector by the first to third transistors and discharges the fifth capacitor through the first variable resistor through the charge and second variable resistors, The discharge voltage can be amplified through the fourth and fifth transistors and applied to the noise rejection filter.

According to the present invention, it is possible to provide a low-cost acoustic preamplifier apparatus which can transmit a unique clear sound of an acoustic string instrument such as a guitar or the like, It is possible to increase the sensitivity and accuracy of the sound played on an acoustic string by using two pairs of piezo configurations for the piezo buzzer and attaching it to the position where the best sound can be realized. And can achieve a useful effect that can transmit a clear distinctive classical sound that is played on an acoustic string instrument.

The present invention can convert a sound to be played during playing of an acoustic string instrument into an electric signal and output it. The acoustic string instrument can be outputted and delivered as a most audible sound when the acoustic string instrument is played through optimal selection of the attachment position of the components, And can deliver a useful effect that can be delivered to a clean signal output that is not included.

1 is a block diagram illustrating an acoustic preamplifier apparatus having a dual channel buzzer system according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating an acoustic preamplifier apparatus having a dual channel buzzer system according to an embodiment of the present invention mounted on a guitar, which is one of the acoustic string instruments.
FIG. 3 is a block diagram illustrating a state in which an acoustic preamplifier apparatus having a dual channel buzzer system according to an embodiment of the present invention is mounted inside a body of a guitar, which is one of the acoustic string instruments.
FIG. 4 is a view for explaining a configuration of a transducer in the present invention. FIG.
5 is a diagram for explaining the configuration of a piezo buzzer in the present invention.
6 is a schematic diagram showing a main board side circuit configuration in the present invention.
7 is a detailed view showing the circuit configuration of the noise detecting unit in the present invention.
8 is a detailed view showing a circuit configuration of a noise removing circuit in the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. The present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

An acoustic preamplifier 100 having a dual channel buzzer system according to an embodiment of the present invention is used by being mounted on a body 2 of an acoustic string instrument 1 including a guitar or aculla, 1 to 8, a main body 110 having a main board 111, a connection jack unit 120, a piezo buzzer 130, a control module 140 And a transducer 150, as shown in Fig.

The main body 110 has a main board 111 for performing overall stable operation and control of the acoustic preamplifier apparatus 100 and is positioned at a lower inner portion of the body 2 of the acoustic string instrument 1 Respectively.

The main board 111 of the main body 110 receives inputs from the piezo buzzer 130, the control module 140 and the transducer 150 to control the acoustic preamplifier device 100 and a connection jack unit And a microcomputer 162 for outputting the output to a separate amplifier device 10 such as a power amplifier connected through a plurality of microcomputers.

The signal processor 164 may be connected to the output terminals of the piezo buzzer 130, the control module 140, and the transducer 150. In this case, A first condenser C1 for allowing a flow of an output signal to flow smoothly, and a second condenser C1 for outputting a voltage of an output signal, And a second diode D1 for rectifying the output signal are sequentially connected in series.

The noise detector 172 may be connected to an output terminal of the microcomputer 162 to detect noise from an output signal and a noise removing unit 174 for removing noise from the noise detector 172 have.

When the noise signal is present in the output signal from the microcomputer 162, the noise detector 172 blocks the noise signal from the second capacitor C2, rectifies the noise signal through the second diode D2, And a comparator U1 for setting a reference voltage by connecting two resistors, that is, a fourth resistor R4 and a fifth resistor R5, to the charge / discharge voltage of the third capacitor C3. And the output voltage of the comparator U1 is charged and discharged again in the fourth condenser C4 so as to be able to detect the noise and to apply the noise detection signal to the noise eliminator 174 .

At this time, the noise detector 172 is provided with a variable resistor (VR) at the input terminal to which the output signal from the microcomputer 162 is inputted, so that the signal can be adjusted in size, .

The noise eliminator 174 amplifies the output from the noise detector 172 by the first to third transistors Q1, Q2 and Q3 and then outputs the amplified signal to the fifth capacitor (VR1) through the first variable resistor C5 and discharges the second capacitor C5 through the second variable resistor VR2 and amplifies the charging and discharging voltage of the fifth capacitor C5 through the fourth and fifth transistors Q4 and Q5, F) side, it is possible to more effectively remove the noise and improve the removal efficiency.

The noise detector 172 and the noise eliminator 174 may be provided on the input side rather than on the output side of the microcomputer 162 or on both the input side and the output side. The control module 140, and the transducer 150, and detects and removes noise from the signals output from the control module 140 and the transducer 150. In this case, the signal processor 164 ).

The connection jack unit 120 is fixed to the main body 110 in such a manner that the main body 110 is protruded from the main body 110 and is fixed to the lower portion of the body 2 of the acoustic string instrument 1, Is electrically connected to the board 111 and is used to connect to a separate amplifier device 10 such as a power amplifier.

At this time, the connection jack part 120 is formed by drilling a hole in the lower end side (tail part) of the acoustic string instrument 1 side of the body 2, by inserting the insertion string and exposing the end part of the acoustic string instrument 1 from the side of the body 2, (10).

The piezo buzzer 130 has a dual channel system of two dual configurations connected to a first connection line 131 electrically connected to the main board 111. The piezo buzzer 130 has a dual channel system, Which is an inner side of the body 2 of the acoustic string instrument 1, to generate an electrical signal sound for the sound to be played by the acoustic string instrument 1.

At this time, the piezo buzzer 130 has a dual structure of two sets, so that it is possible to increase the sensitivity and accuracy of the sound to be played in the acoustic string instrument 1, thereby generating a more precise electrical signal tone, (1). ≪ / RTI >

The piezoelectric buzzer 130 having the dual configuration of the two sets is positioned close to the bridge portion 4 provided on the body 2 side of the acoustic string instrument 1 so as to be able to produce a best listening sound And it is desirable to attach it so that the sensitivity to the sound being played can be increased.

More specifically, the two pairs of the piezo buzzer 130 are positioned on both sides below the bridge portion 4 on the side of the body 2 of the acoustic string instrument 1 and spaced apart from each other, It is preferable to adhere it.

Each of the two pairs of piezoelectric buzzer 130 has the same configuration. The piezoelectric buzzer 130 is connected to the first connection line 131 and is adapted to transmit a signal to the main board 111, 1, a diaphragm 132 for generating an electrical signal by vibration due to trembling when the diaphragm 1 is played, a protective case 133 for inserting and protecting the diaphragm 132, And a double-sided tape (134) attached to one surface and fixedly arranged on the body (2) side of the acoustic string instrument (1).

At this time, the protective case 133 has a circular outer case 133a formed to have a double wall structure around the periphery and having a lower inner wall than the outer wall so that the diaphragm 132 can be seated and placed, A center hole is formed on the side of the mounting surface of the acoustic string instrument 1 which is attached to the body 2 side so as to be inserted into a space between the double walls of the outer case 133a, So that the vibration of the diaphragm 132 can be transmitted to the diaphragm 132 easily.

At this time, the diaphragm 132 forms a wave surface by wave-treating the vibrating plate 132 so that the vibration due to the jumping of the string during the playing of the acoustic string instrument 1 can be more easily transmitted to the diaphragm 132, A perforation may be formed on the wave surface so that the vibration of the protective case 133 caused by the air flow may be increased to increase sensitivity in response to the sound being played.

In addition, the piezo buzzer 130 may have a structure including vibration amplifying means to more efficiently detect and transmit the vibration when bending the string when playing through the acoustic string instrument 1, 1 attached to the inner surface of the body 2 side and then the piezo buzzer 130 is attached.

The control module 140 is connected to a second connection line 141 electrically connected to the main board 111 and allows the user to adjust the tone of the master volume and tone and the sound of the piezo buzzer 130 It is preferable that the acoustic string instrument 1 is placed at the edge of the sound hole portion 3 on the body 2 side of the acoustic string instrument 1 and is used.

The control module 140 may be positioned at the edge of the sound hole 3 of the body 2 of the acoustic string instrument 1 so that the control module 140 may be rounded in a shape corresponding to the sound hole 3, It can be easily attached and used by using double-sided tape or the like.

The control module 140 includes a printed circuit board connected to the first connection line 141, the round shape of which is an arc-shaped body, and a master A volume unit, a tone control unit, and a buzzer control unit.

Here, the control module 140 may be used to adjust the volume as follows for the best sound output when playing a guitar.

For example, if you are in the range of minimum volume 0 to maximum volume 10, you should adjust the master volume to 8, the tone volume to 7, and the buzzer volume to 3 Do.

In case of the arpeggio playing style, it is preferable to adjust the master volume to 8, the tone volume to 7, and the buzzer volume to 5.

The transducer 150 is connected to a third connection line 151 electrically connected to the main board 111 and fixedly disposed inside the body 2 of the acoustic string instrument 1, It is preferable to position the saddle portion 5 in the lower direction of the saddle portion 5 provided on the upper surface of the bridge portion 4 on the side of the body 2 so that the sound transfer force is most excellent for the sound played in the stringed instrument 1.

At this time, the transducer 150 is fixedly disposed inside the body 2 of the acoustic string instrument 1, and a slot 152 is formed on a lower surface of the bridge portion 4 on the side of the body 2, And a metal body in the form of a bar which is inserted and fixed to the base body 152.

Here, the bar-shaped metal body is connected to the third connection line 151 which is a wire and connected to the main board 111 side, converts a signal generated by the tremble into an electric signal, 1 to an electric signal and transmits it to the microcomputer 162 side.

In the present invention having the above-described configuration, the dual channel buzzer system is provided through the two pairs of dual-structured piezo buzzer 130, and the volume control and the transducer 150 are controlled through the control module 140, The microcomputer 162 controls the microcomputer 162 to output an output signal so that the acoustic string 1 can be converted into a sound rich in sound while transmitting a clear sound unique to the performance of the acoustic string instrument 1 .

In addition, through the control module 140, the volume of the master volume and the volume of the tone and piezo buzzer are adjusted according to the playing method of the acoustic string instrument 1, respectively.

An output signal from a pair of piezo buzzer 130, which is a dual configuration in which the performance sound generated when the strings are blown out of the acoustic string instrument 1 or the like is placed on the lower side of the bridge section 4 and the output signal from the bridge section 4 The output signal of the transducer 150 placed on the main board 111 is amplified and delivered through the control of the microcomputer 162 mounted on the main board 111 with the best listening sound.

At this time, the microcomputer 162 outputs the output signal of the pair of piezo buzzer 130 and the output signal of the transducer 150, which are dual in combination, It amplifies the output with the best listening sound.

The noise detector 172 connected to the microcomputer 162 and the noise remover 174 can easily detect the noise that can be mixed with the output signal or the input signal or the input / After detecting and removing the sound, the sound output is transmitted finally, so that it is possible to produce sound that is clean and good to listen to.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. May be made, which will be within the technical scope of the present invention.

1: Acoustic Strings 2: Body
3: Sound hole part 4: Bridge part
5. Saddle section 100: Acoustic preamplifier device
110: main body 111: main board
120: connection jack unit 130: piezo buzzer
131: first connection line 132: diaphragm
133: Protective case 134: Double-sided tape
140: Control module 150: Transducer
162: Microcomputer 164: Signal processor
172: noise detection unit 174: noise rejection unit

Claims (6)

The present invention relates to an acoustic preamplifier which is mounted on a body of an acoustic string instrument such as a guitar or an acoustic collimator and amplifies sound output from the acoustic string instrument,
A main body having a main board for performing stable operation and control of the acoustic preamplifier device and located at a lower side of a body of the acoustic string instrument; A connecting jack portion which is fixed to the main body so as to be protruded from the main body while being supported and coupled to the main body and fixed to the lower side of the body of the acoustic string instrument and electrically connected to the main board and connected to another amplifier device; A piezo buzzer that is connected to a first connection line electrically connected to the main board and has a pair of dual configurations and is attached inside the body of the acoustic string to generate an electrical signal for the sound played in the acoustic string; A control module connected to a second connection line electrically connected to the main board and adapted to adjust a volume of a master volume, a tone, and the piezo buzzer, and positioned at an edge of the sound hole of the body side of the acoustic string instrument; And a third connecting line electrically connected to the main board and fixed to the inside of the body of the acoustic string instrument so that the sound transmitting force is most excellent for the sound played in the acoustic string instrument, A transducer positioned in a lower saddle portion of the saddle; Lt; / RTI >
Each of the two pairs of piezoelectric buzzers,
A diaphragm connected to the first connection line and generating an electrical signal by vibration due to tremble during playing of the acoustic string instrument; A protective case into which the diaphragm is inserted; A double-sided tape attached to one surface of the protective case for fixing the body side of the acoustic string instrument; Wherein the protective case has a circular outer case which is spaced apart from the outer wall and has a lower inner wall than the outer wall so that the diaphragm can be seated and disposed, And a central hole is formed in the body side attachment surface to form a circular inner case so that the vibration due to the jumping of the string during the performance of the acoustic string instrument can be transmitted to the diaphragm,
Wherein the dual channel buzzer system is provided through the two pairs of the dual-channel piezo buzzer so that the acoustic string can be converted into a sound rich in sound while delivering a distinctive clear sound when the acoustic string is played, Acoustic preamplifier device with system. The method according to claim 1,
The piezo buzzer, which is a dual configuration of the two sets,
Wherein the microphone is located close to a body side bridge portion of the acoustic string instrument so as to increase the sensitivity of the response to the best sound and the performance sound when the performance is performed. 3. The method of claim 2,
The piezo buzzer, which is a dual configuration of the two sets,
Wherein the acoustic preamplifier is placed on both sides of the body under the bridge of the body of the acoustic stringer, and the acoustic preamplifiers are spaced from each other and positioned on the same horizontal line. The method according to claim 1,
The transducer includes:
Wherein the speaker is fixed to the inside of the body of the acoustic string instrument and has a slot formed on the bottom surface of the bridge portion on the side of the body and is inserted and fixed in the slot. Amplifier device. delete The method according to claim 1,
A main board of the main body is equipped with a microcomputer for receiving an input from the piezo buzzer, a control module, and a transducer and outputting the output to an amplifier device connected to the acoustic preamplifier through a control and connection jack unit;
And a signal processing unit connected to each output terminal of the piezo buzzer, the control module, and the transducer so as to allow an accurate signal input to the microcomputer, wherein the signal processor includes a first capacitor, a first resistor and a second diode sequentially A serial connection;
A noise detector connected to an output terminal of the microcomputer for detecting noise from an output signal, and a noise eliminator for removing noise from the noise detector when the noise is detected,
The noise detector may include:
If the noise signal is present in the output signal from the microcomputer, the second capacitor intercepts the noise signal, rectifies the second signal through the second diode, and charges / discharges the third signal through the third capacitor, Compare the reference voltage with a comparator whose reference voltage is set, and apply an output voltage of the comparator to the noise eliminator by charging and discharging again in the fourth capacitor;
Wherein the noise eliminator comprises:
The output from the noise detector is amplified by the first to third transistors, and then charged to the fifth capacitor through the first variable resistor and discharged through the second variable resistor, and the charge / And the fifth transistor to apply the amplified signal to the noise canceling filter. The acoustic preamplifier apparatus according to claim 1,
KR1020180026126A 2018-03-06 2018-03-06 Acoustic preamplifier device witn dual channel buzzer system KR101866162B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102193278B1 (en) * 2019-11-28 2020-12-23 김이현 Automotive door lock device using On Board Diagnostics terminal

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005331677A (en) * 2004-05-19 2005-12-02 Yamaha Corp Pickup device for plucked string instrument, and the plucked string instrument
KR20130042096A (en) 2011-10-18 2013-04-26 김동섭 Piezo pickup magnets that hold the strings
KR101397418B1 (en) 2014-01-20 2014-05-22 (주)지앤비픽업 Portable speaker for guitar

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005331677A (en) * 2004-05-19 2005-12-02 Yamaha Corp Pickup device for plucked string instrument, and the plucked string instrument
KR20130042096A (en) 2011-10-18 2013-04-26 김동섭 Piezo pickup magnets that hold the strings
KR101397418B1 (en) 2014-01-20 2014-05-22 (주)지앤비픽업 Portable speaker for guitar

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102193278B1 (en) * 2019-11-28 2020-12-23 김이현 Automotive door lock device using On Board Diagnostics terminal

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