WO2019212077A1 - Circuit de haut-parleur ultra-directionnel à stabilité améliorée - Google Patents

Circuit de haut-parleur ultra-directionnel à stabilité améliorée Download PDF

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Publication number
WO2019212077A1
WO2019212077A1 PCT/KR2018/005159 KR2018005159W WO2019212077A1 WO 2019212077 A1 WO2019212077 A1 WO 2019212077A1 KR 2018005159 W KR2018005159 W KR 2018005159W WO 2019212077 A1 WO2019212077 A1 WO 2019212077A1
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WO
WIPO (PCT)
Prior art keywords
speaker
inductor
directional
audio signal
circuit
Prior art date
Application number
PCT/KR2018/005159
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English (en)
Korean (ko)
Inventor
제영호
조문철
임용묵
Original Assignee
주식회사 제이디솔루션
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 주식회사 제이디솔루션 filed Critical 주식회사 제이디솔루션
Priority to PCT/KR2018/005159 priority Critical patent/WO2019212077A1/fr
Publication of WO2019212077A1 publication Critical patent/WO2019212077A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/04—Circuits for transducers, loudspeakers or microphones for correcting frequency response

Definitions

  • the present invention relates to a super directional speaker circuit with increased stability, and more particularly, to a super directional speaker circuit with increased stability capable of preventing breakage due to counter electromotive force.
  • Super-directional speaker is a speaker that can be heard only in a specific area by aiming and shooting the sound like a light, and the range of applications such as an exhibition hall, a bus station, and a guide system for the visually impaired are endless.
  • Super-directional speaker is a special speaker that modulates a sound signal and delivers it on an ultrasonic signal. The sound transmission distance is up to 300m, far more than the normal speaker.
  • the CLASS D amplifier (Amp, Amplifier) of the general speaker and the superdirectional speaker typically converts the digital signal (DIGITAL SIGNAL) into an analog signal (ANALOG SIGNAL) using one LC FILTER.
  • Audi's amplifiers are divided into A, B, AB, and D classes according to the difference in how transistors or vacuum tubes amplify the waveform at the output stage of the amplifier.
  • Class D amplifiers are either switching or pulse width modulation (PWM) amplifiers.
  • PWM pulse width modulation
  • Class-D amplifiers use PWM modulation technology, which typically transforms the input signal into a form that is good for communication. This approach allows switching devices to be fully on or off, greatly reducing power losses in the output devices, resulting in efficiencies of 90 to 95% (20% efficiency in class A), and audio signals drive the output devices.
  • the PWM carrier signal is modulated to remove the high frequency PWM carrier frequency with a low pass filter (LPF) at the end.
  • LPF low pass filter
  • the problem with the D-class amplifier circuit of the conventional super-directional speaker is that the capacitance (C) increases as the number of speakers connected to the signal line increases, and the coil width increases as the duty width increases according to the PWM duty when the PWM signal is applied. (COIL) There is a fatal problem that the voltage applied to the speaker exceeds the limit value (for example, 100Vp-p) due to the increase in back electromotive force and the speaker element is damaged due to damage.
  • the limit value for example, 100Vp-p
  • the present invention is to propose a super-directional speaker circuit with increased stability that can solve the above technical constraints.
  • Patent Document 1 Korean Registered Patent No. 10-0622078, published on September 1, 2006 (Name: Super-directional speaker system and signal processing method)
  • Patent Document 2 Korean Registered Patent No. 10-1074431, released on October 11, 2011 (name: super-directional ultrasonic speaker system)
  • Patent Document 3 Korean Patent Registration No. 10-1833892, published on February 23, 2018 (name: piezoelectric MEMS-based super-directional loudspeaker and its beam steering method)
  • the present invention has been proposed to solve the above-described problems of the prior art, and a main object of the present invention is to provide a superdirectional speaker circuit having increased stability that can prevent breakage caused by back electromotive force of a superdirectional speaker according to a conventional circuit configuration. have.
  • another object of the present invention is to provide a super-directional speaker circuit with increased stability that can control the voltage applied to the super-directional speaker within a certain range.
  • One aspect of the present invention for achieving the above object is a first inductor and a third inductor connected to an electrical signal line of a positive polarity for speaker input; A second inductor and a fourth inductor connected to an electrical signal line of negative polarity for speaker input; And a first speaker, a second speaker, a third speaker, and a fourth speaker for receiving the speaker input and converting the vibration into a vibration that can be perceived by a human.
  • the audio signal passing through the first inductor is the first speaker.
  • the stability is increased by being input to the positive polarity terminals of the third and fourth speakers, respectively, and the audio signal passing through the fourth inductor is connected to the negative polarity terminals of the third and fourth speakers.
  • the amplifiers of the first to fourth speakers may be class D amplifiers.
  • the audio signal input to the first to fourth speakers may be a pulse width modulation (PWM) signal.
  • PWM pulse width modulation
  • the superdirectional speaker circuit having increased stability of the present invention there is an effect that it is possible to provide a superdirectional speaker circuit with increased stability that can prevent breakage caused by counter electromotive force of the superdirectional speaker according to the conventional circuit configuration.
  • FIG. 1 is a diagram of a configuration of a superdirectional speaker circuit according to the prior art.
  • FIG. 2 is a diagram illustrating a configuration of a superdirectional speaker circuit having increased stability according to an embodiment of the present invention.
  • FIG. 1 is a diagram of a configuration of a superdirectional speaker circuit according to the prior art.
  • a CLASS D amplifier (Amp, Amplifier) of a superdirectional speaker typically converts a digital signal (DIGITAL SIGNAL) into an analog signal (ANALOG SIGNAL) using one LC FILTER.
  • FIG. 1 illustrates a configuration in which six speakers are connected.
  • Capacitors pass high frequencies and suppress low frequencies according to capacitance (uF), while inductors pass low frequencies and suppress high frequencies according to capacitance (mF).
  • LPF low pass filter
  • LPF is a filter structure used to filter out high frequency noise signals and to filter out only low frequency signals. It is a filter type that is widely used in all fields such as low frequency ripple in power supply stage, high frequency spurious removal, harmonic suppression and various detections.
  • Popular Class D amplifiers typically convert analog signals to PWM and then amplify them through a switching controller and an output stage instead of analog amplification devices such as transistors or tubes.
  • the switched amplified digital signal is converted back into an analog signal through a low pass filter and input to the speaker.
  • PWM Pulse Width Modulation
  • PWM Pulse Width Modulation
  • Some synthesizers get chorus-like variations in this way.
  • One way to pulse an analog signal is to apply it to a power amplifier and simply get a large output.
  • the problem with the D-class amplifier circuit of the conventional super-directional speaker is that the capacitance (C) increases as the number of speakers connected to the signal line increases, and the coil width increases as the duty width increases according to the PWM duty when the PWM signal is applied.
  • the (COIL) back electromotive force increases so that the voltage applied to the speaker exceeds a threshold value (eg, 100 Vp-p).
  • the counter electromotive force refers to electromotive force generated in an opposite direction to a power supply voltage in an electric substrate or an electric circuit.
  • a circuit with inductance such as a transformer, a DC motor, or an alternating current motor
  • current flows rapidly as soon as the voltage is applied, so the electromotive force proportional to the magnitude of the change in current by Faraday's law of electromagnetic induction. This occurs in the opposite direction to the applied voltage.
  • the duty width is widened according to the PWM duty, the speaker element is damaged due to back EMF in the D-class amplifier circuit of the super-directional speaker. There is no small product that can guarantee output while exceeding 100Vp-p among commercially available superdirectional speakers.
  • FIG. 2 is a diagram illustrating a configuration of a superdirectional speaker circuit having increased stability according to an embodiment of the present invention.
  • FIG. 2 a configuration in which six speakers are connected is illustrated, but the number of speakers is not limited thereto.
  • the audio signal for the speaker input is connected in parallel to the positive polarities of the speakers T1 to T6 via the inductor L1 through the positive polarity electrical signal line (speaker cable), and through the electrical signal line with the negative polarity.
  • the inductors L2 are connected in parallel to the negative polarities of the speakers T1 to T6, respectively.
  • the inductor L1 and the inductor L2 are grouped into one group
  • the inductor L3 and the inductor L4 are grouped into two groups
  • the inductor L5 and the inductor L6 are grouped into three groups.
  • the capacitance (C) is fixed to a constant value, so that the PWM signal is applied to each speaker even if the width of the PWM duty is wide.
  • the voltage does not exceed a certain value (eg, 52Vp-p), making it safe from back EMF.
  • the audio signal for speaker input is connected in parallel to the plus polarity of the speakers T1 to T2 via the inductor L1 through the electrical signal line (speaker cable) of positive polarity, and the inductor L2 is connected to the positive polarity of the electrical signal line with the negative polarity.
  • the inductor L2 is connected to the positive polarity of the electrical signal line with the negative polarity.
  • the audio signal for speaker input is connected in parallel through the inductor L3 via the positive polarity electrical signal line (speaker cable) to the plus polarity of the speakers T3 to T4, respectively, and the inductor L4 through the electrical signal line with the negative polarity. And connected in parallel to the negative polarity of the speakers T3 to T4, respectively.
  • the audio signal for speaker input is connected in parallel through the inductor L5 via the positive polarity electrical signal line (speaker cable) to the plus polarity of the speakers T5 to T6, respectively, and the inductor L6 through the electrical signal line with the negative polarity. And connected in parallel to the negative polarity of the speakers T5 to T6, respectively.
  • Speakers T1 to T6 receive speaker inputs as electrical signals from source devices (such as microphones in performance halls and various audio players) and convert them into vibrations that can be perceived by humans as sounds.
  • source devices such as microphones in performance halls and various audio players
  • the electrical signal line connecting the source device and the speaker devices T1 to T6 is manufactured to be able to transmit cleanly while minimizing a large amount of signal loss.
  • the material of the wire of the speaker cable is copper, which has a very good electrical conductivity as well as heat, and copper is most widely used.
  • copper contains some oxygen, and oxygen is a component that interferes with current flow.
  • Oxygen-free copper wire (OFC) which effectively removes and improves the quality of electrical transmission, is used for speaker cables.
  • Speaker wires can be used with a variety of wires, such as silver-plated oxygen-free copper wire, made entirely of silver, a mixture of silver-plated wire and copper wire, and tin.
  • the power amplifier serves to amplify the output sufficiently so that the speaker properly drives the output signal from the signal splitter.
  • the power amplifier is implemented in a form included in the speaker.
  • two groups are grouped into L1, L2, and T1 and T2, but the number of inductors and speakers that can be grouped into one group is not limited to two. It is possible to group three or more inductors and three or more speakers connected thereto in one group if it is possible to configure below the threshold at which the superdirectional speakers can be driven from back EMF.
  • the inductor L1, the inductor L2 and the inductor L3, the speaker T1, the speaker T2 and the speaker T3 are grouped into one group
  • the inductor L4, the inductor L5 and the inductor L6, the speaker T4, the speakers T5 and T6 are grouped into two groups, and the like.
  • the circuitry attached herein may be performed by computer program instructions.
  • These computer program instructions may be mounted on a processor of a general purpose computer, special purpose computer, or other programmable data processing equipment such that instructions executed through the processor of the computer or other programmable data processing equipment may not be included in each block or flowchart of the block diagram. It will create means for performing the functions described in each step.
  • These computer program instructions may be stored in a computer usable or computer readable memory that can be directed to a computer or other programmable data processing equipment to implement functionality in a particular manner, and thus the computer usable or computer readable memory. It is also possible for the instructions stored in to produce an article of manufacture containing instruction means for performing the functions described in each block or flowchart of each step of the block diagram.
  • Computer program instructions may also be mounted on a computer or other programmable data processing equipment, such that a series of operating steps may be performed on the computer or other programmable data processing equipment to create a computer-implemented process to create a computer or other programmable data. Instructions that perform processing equipment may also provide steps for performing the functions described in each block of the block diagram and in each step of the flowchart.
  • a superdirectional speaker circuit having increased stability of the present invention a superdirectional speaker circuit having increased stability capable of preventing breakage due to back electromotive force of a superdirectional speaker by controlling a voltage applied to the superdirectional speaker within a predetermined range is provided.
  • the related technology it is not only possible to use the related technology, but also the possibility of marketing or sales of the applied device as well as using the related technology is not only sufficient, but also realistically implemented. It is an invention that can be used.
  • T1 T2, T3, T4, T5, T6: Speaker

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Amplifiers (AREA)
  • Circuit For Audible Band Transducer (AREA)

Abstract

La présente invention concerne un circuit de haut-parleur ultra-directionnel à stabilité améliorée. Le circuit de haut-parleur ultra-directionnel à stabilité améliorée comprend : une première bobine d'induction et une troisième bobine d'induction connectées à une ligne de signal électrique à polarité positive pour une entrée de haut-parleur; une deuxième bobine d'induction et une quatrième bobine d'induction connectées à une ligne de signal électrique de polarité négative pour une entrée de haut-parleur; et un premier haut-parleur, un deuxième haut-parleur, un troisième haut-parleur et un quatrième haut-parleur qui reçoivent l'entrée de haut-parleur et la convertissent en une vibration qui peut être reconnue comme un son par un être humain. Selon la présente invention, un signal audio ayant traversé la première bobine d'induction est entré dans chacune des bornes de polarité positive du premier haut-parleur et du deuxième haut-parleur, et un signal audio ayant traversé la deuxième bobine d'induction est connecté à des bornes de polarité négative du premier haut-parleur et du deuxième haut-parleur. En outre, un signal audio ayant traversé la troisième bobine d'induction est entré dans chacune des bornes de polarité positive du troisième haut-parleur et du quatrième haut-parleur, et un signal audio ayant traversé la quatrième bobine d'induction est connecté à des bornes de polarité négative du troisième haut-parleur et du quatrième haut-parleur. Dans la solution selon l'invention, un circuit de haut-parleur ultra-directionnel à stabilité améliorée peut prévenir des dommages causés par une force contre-électromotrice d'un haut-parleur ultra-directionnel via le contrôle, à l'intérieur de la plage constante, d'une tension appliquée au haut-parleur ultra-directionnel.
PCT/KR2018/005159 2018-05-04 2018-05-04 Circuit de haut-parleur ultra-directionnel à stabilité améliorée WO2019212077A1 (fr)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005203869A (ja) * 2004-01-13 2005-07-28 Mitsubishi Electric Engineering Co Ltd 超指向性音響装置
US7181025B2 (en) * 2001-04-07 2007-02-20 Daimlerchrysler Ag Ultrasound based parametric loudspeaker system
KR101086398B1 (ko) * 2003-12-24 2011-11-25 삼성전자주식회사 다수의 마이크로폰을 이용한 지향성 제어 가능 스피커시스템 및 그 방법
JP2015159404A (ja) * 2014-02-24 2015-09-03 パイオニア株式会社 パラメトリックスピーカおよびパラメトリックスピーカシステム
KR101833892B1 (ko) * 2017-02-08 2018-03-02 포항공과대학교 산학협력단 압전 멤스 기반 초지향성 라우드 스피커 및 이의 빔 조향 방법

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7181025B2 (en) * 2001-04-07 2007-02-20 Daimlerchrysler Ag Ultrasound based parametric loudspeaker system
KR101086398B1 (ko) * 2003-12-24 2011-11-25 삼성전자주식회사 다수의 마이크로폰을 이용한 지향성 제어 가능 스피커시스템 및 그 방법
JP2005203869A (ja) * 2004-01-13 2005-07-28 Mitsubishi Electric Engineering Co Ltd 超指向性音響装置
JP2015159404A (ja) * 2014-02-24 2015-09-03 パイオニア株式会社 パラメトリックスピーカおよびパラメトリックスピーカシステム
KR101833892B1 (ko) * 2017-02-08 2018-03-02 포항공과대학교 산학협력단 압전 멤스 기반 초지향성 라우드 스피커 및 이의 빔 조향 방법

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