EP0366109A2 - Procédé et dispositif pour la linéarisation de la réponse en fréquence d'un système de haut-parleur - Google Patents

Procédé et dispositif pour la linéarisation de la réponse en fréquence d'un système de haut-parleur Download PDF

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Publication number
EP0366109A2
EP0366109A2 EP19890119821 EP89119821A EP0366109A2 EP 0366109 A2 EP0366109 A2 EP 0366109A2 EP 19890119821 EP19890119821 EP 19890119821 EP 89119821 A EP89119821 A EP 89119821A EP 0366109 A2 EP0366109 A2 EP 0366109A2
Authority
EP
European Patent Office
Prior art keywords
operational amplifier
loudspeaker
loudspeaker system
voltage
signal
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
EP19890119821
Other languages
German (de)
English (en)
Other versions
EP0366109A3 (fr
Inventor
Michael Walker
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alcatel Lucent Deutschland AG
Alcatel Lucent NV
Original Assignee
Alcatel SEL AG
Alcatel NV
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.)
Filing date
Publication date
Application filed by Alcatel SEL AG, Alcatel NV filed Critical Alcatel SEL AG
Publication of EP0366109A2 publication Critical patent/EP0366109A2/fr
Publication of EP0366109A3 publication Critical patent/EP0366109A3/fr
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers
    • H04R3/04—Circuits for transducers for correcting frequency response
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers
    • H04R3/002—Damping circuit arrangements for transducers, e.g. motional feedback circuits

Definitions

  • the invention relates to a method and a device for linearizing the frequency response of a loudspeaker system, in particular for suppressing resonance phenomena.
  • a phase and amplitude controlled loudspeaker with any number of paths is known.
  • the aim of this regulation is to linearize the frequency response (phase + amplitude) of a sound transducer.
  • the sound transducer can be a single speaker, but also an arrangement consisting of several speakers.
  • the control loop consists of the elements power amplifier, passive crossover, summing amplifier and one or more loudspeakers.
  • the controlled variable is the voltage that controls the loudspeakers and is fed back at the input of the power amplifier.
  • An operational amplifier connected to a feedback network is located in the feedback.
  • the controlled variable can also be derived from other sensors (see Figure 1 of the published specification).
  • the known regulated loudspeaker has the disadvantage that only a voltage negative feedback is carried out here, which has little influence on the natural dynamics of the loudspeaker. If a loudspeaker is operated, for example, at a frequency that is very close to a resonance point of the loudspeaker housing, the power emitted by the loudspeaker changes very strongly, but this is hardly noticeable in the control voltage. Under such operating conditions, the known regulation has little effect.
  • the object of the invention is to linearize the frequency response of a speaker or speaker system so that the influence of mechanical resonances caused by the geometric dimensions of the housing is compensated.
  • the power emitted by the loudspeaker or loudspeaker system should become frequency-independent.
  • the method and device according to the invention have the advantage that the control variable is not the voltage output by a power amplifier, but the impedance of the loudspeaker system.
  • the impedance of a loudspeaker system shows sharp peaks in the vicinity of mechanical resonance points, it being irrelevant whether the resonance of the loudspeaker or the housing is intrinsic.
  • The serves as a measure of the impedance of the speaker system current flowing through the speaker system.
  • the power emitted by the loudspeaker system is regulated by controlling the current flowing through the loudspeaker system (negative current feedback)
  • Another advantage is the fact that by feedback of a filtered signal proportional to the impedance of the loudspeaker system, the frequency response for other frequency ranges, especially for frequencies below 200 Hz, is linearized or brought into a desired course.
  • Sound transducers also called loudspeaker systems in the following, are intended for control with constant electrical power in a large frequency range radiate an acoustic power independent of the frequency.
  • the sound pressure p of an idealized loudspeaker is plotted against the frequency f.
  • the sound pressure p is independent of the frequency for a large frequency range (reference number 1).
  • Curve 2 in Figure 1b shows the sound pressure of a real loudspeaker system depending on the frequency.
  • Mechanical resonances of the loudspeaker system occur at the frequencies designated 3 and 4. In the vicinity of such a resonance point, the sound pressure initially drops sharply, then passes through a minimum, then exceeds the desired value and then falls back to the desired value. Sound pressure curves like curve 2 in FIG. 1b are undesirable for sound converters.
  • Fig. 1c again represents the sound pressure of an (ideal) loudspeaker depending on the frequency. Measures that are discussed in connection with FIG. 2 cause the low frequencies to be raised (5) and the upper limit frequency to be pushed further out (6).
  • a power amplifier is designated by 10, which generates an electrical power required to control a loudspeaker system 20.
  • the current flowing through the loudspeaker system 20 is measured using a measuring resistor 21.
  • the voltage signal at the measuring resistor 21 is fed to a first operational amplifier, designated 30.
  • 33 is a high-pass filter, which is the voltage on the speaker system 20 with the connects inverting input of operational amplifier 30.
  • a second operational amplifier 40 amplifies a difference signal which is formed from the output signal of the operational amplifier 30 and the voltage applied to the loudspeaker system.
  • the output of the operational amplifier 30 and the non-inverting input of the operational amplifier 40 are connected to one another via a third high-pass filter 22.
  • the voltage signal is applied to the inverting input of the operational amplifier 40 via a second high-pass filter 45 and an adder 42.
  • a low pass 44 which is superimposed at the summation point 42 on the signal from the high pass 45.
  • the output voltage of the operational amplifier 40 is added in an adder 16 to a low-frequency voltage to be amplified and applied to the input of the power amplifier 10.
  • the entire circuit represents a negative current feedback and operates as follows:
  • the current driving the loudspeaker system 20 generates a voltage drop in the measuring resistor 21, which is amplified by the operational amplifier 30.
  • the amplification factor of the amplifier 30 is selected such that its output voltage in operating states in which there are no mechanical resonances in the loudspeaker system 20 is the same in terms of amount and phase of the voltage on the loudspeaker system.
  • the voltage at the loudspeaker system passes through the second high-pass filter 45 to the inverting input of the amplifier 40, the output voltage of the amplifier 30 via the high-pass filter 22 to the non-inverting input of the amplifier 40. In the normal case, the output signal of the operational amplifier 40 is therefore zero.
  • the system vibrates with a significantly lower power consumption, but the resulting measurable electrical impedance of the voice coil increases - excessive resonance in the parallel resonant circuit.
  • the voltage driving the speaker system remains the same, while the current through the speaker system decreases sharply, i.e. in other words, the input signal of the operational amplifier 30 becomes smaller.
  • a differential signal that is not equal to zero is now present at the operational amplifier 40.
  • This signal is amplified by the operational amplifier 40 and superimposed at the summation point 16 of the low-frequency voltage to be amplified. If the high-pass filters 22, 33 and 45 are selected appropriately, the two signals are superimposed so that the sound power emitted by the loudspeaker system remains constant.
  • the measures described also improve the pulse behavior of the loudspeaker system, since the mechanical vibrations excited by pulses are quickly dampened as a result of the negative feedback.
  • the circuit principle shown in Fig. 2 has yet another advantage. Frequently, when using inexpensive sound transducers, the low frequencies below 200 Hz are missing in the reproduction spectrum. The sound pressure drops significantly at frequencies below 200 Hz, which makes the reproduction sound garish. The impedance of the speaker system also decreases at these frequencies. If the lower cut-off frequency of the high-pass filter 45 is selected to be higher than that of the filter 22, a phase rotation of 180 ° occurs below the cut-off frequency in the correction signal, which causes positive feedback in this frequency range (cf. FIGS. 1c, 5). This measure can Sound radiation behavior of the speaker system can be improved at low frequencies. With the help of the filter 44, the sound radiation behavior at high frequencies can be influenced (cf. FIGS. 1c, 6).
  • FIG. 3 shows a circuit example for the basic circuit diagram according to FIG. 2.
  • the same reference numerals designate the same elements as in FIG. 1. All details of the circuit are omitted here, since the essence of the invention is not in the construction of the circuit but in the one used Principle lies.
  • the operational amplifier 30 is a symmetrically constructed amplifier. That is, the resistors 35 and the high-pass resistor 33 are the same, and the two resistors 34 and 36 are the same.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Amplifiers (AREA)
EP19890119821 1988-10-28 1989-10-25 Procédé et dispositif pour la linéarisation de la réponse en fréquence d'un système de haut-parleur Ceased EP0366109A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3836745A DE3836745A1 (de) 1988-10-28 1988-10-28 Verfahren und vorrichtung zur linearisierung des frequenzganges eines lautsprechersystems
DE3836745 1988-10-28

Publications (2)

Publication Number Publication Date
EP0366109A2 true EP0366109A2 (fr) 1990-05-02
EP0366109A3 EP0366109A3 (fr) 1991-12-11

Family

ID=6366103

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890119821 Ceased EP0366109A3 (fr) 1988-10-28 1989-10-25 Procédé et dispositif pour la linéarisation de la réponse en fréquence d'un système de haut-parleur

Country Status (3)

Country Link
US (1) US5068903A (fr)
EP (1) EP0366109A3 (fr)
DE (1) DE3836745A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5206912A (en) * 1989-06-20 1993-04-27 Yamaha Corporation Power amplifier adapter
US5226089A (en) * 1990-04-16 1993-07-06 Samsung Electronics Co., Ltd. Circuit and method for compensating low frequency band for use in a speaker
CN106063294A (zh) * 2014-03-05 2016-10-26 万络机电公司 用于在至少一个扬声器的上游对其供应电路中的谐振峰值进行滤波的装置和方法
CN106105260A (zh) * 2014-03-04 2016-11-09 万络机电公司 用于对至少一个扬声器的供应电路中的谐振峰值进行滤波的装置和方法

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DE4334040C2 (de) * 1993-10-06 1996-07-11 Klippel Wolfgang Schaltungsanordnung zur selbständigen Korrektur des Übertragungsverhaltens von elektrodynamischen Schallsendern ohne zusätzlichen mechanischen oder akustischen Sensor
WO1997025833A1 (fr) * 1996-01-12 1997-07-17 Per Melchior Larsen Procede pour corriger les phenomenes de transfert non lineaire dans un haut-parleur
US5796305A (en) 1996-06-14 1998-08-18 Peavey Electronics Corporation Amplifier arrangements with high damping factor
US5771300A (en) * 1996-09-25 1998-06-23 Carrier Corporation Loudspeaker phase distortion control using velocity feedback
KR100226226B1 (ko) * 1997-02-24 1999-10-15 윤덕용 혼합형 증폭기
US20040017921A1 (en) * 2002-07-26 2004-01-29 Mantovani Jose Ricardo Baddini Electrical impedance based audio compensation in audio devices and methods therefor
US20040086140A1 (en) * 2002-11-06 2004-05-06 Fedigan Stephen John Apparatus and method for driving an audio speaker
US8005230B2 (en) * 2002-12-20 2011-08-23 The AVC Group, LLC Method and system for digitally controlling a multi-channel audio amplifier
KR101104920B1 (ko) * 2003-09-16 2012-01-12 코닌클리케 필립스 일렉트로닉스 엔.브이. 오디오 주파수 범위 적응
EP1523218A1 (fr) * 2003-10-10 2005-04-13 Sony Ericsson Mobile Communications AB Méthode de réglage d'un haut-parleur et dispositif de réglage associé
US7826625B2 (en) * 2004-12-21 2010-11-02 Ntt Docomo, Inc. Method and apparatus for frame-based loudspeaker equalization
FR2884077B1 (fr) * 2005-04-05 2007-06-15 Nicolas Bailly Amplificateur a double asservissement et enceinte associee
US7873172B2 (en) * 2005-06-06 2011-01-18 Ntt Docomo, Inc. Modified volterra-wiener-hammerstein (MVWH) method for loudspeaker modeling and equalization
US7612682B2 (en) * 2005-06-07 2009-11-03 Metrotech Corporation Locator with removable antenna portion
WO2008007312A1 (fr) * 2006-07-10 2008-01-17 Bobinados De Transformadores S.L. Amplificateur de puissance
WO2008008751A2 (fr) * 2006-07-10 2008-01-17 Asterion, Inc. Amplificateur de puissance avec compensation de tension de sortie
GB0725117D0 (en) * 2007-12-21 2008-01-30 Wolfson Microelectronics Plc Frequency control based on device properties
EP2355542B1 (fr) 2010-02-04 2012-09-12 Nxp B.V. Contrôle de la sortie d'un haut-parleur
US8319507B2 (en) * 2010-02-08 2012-11-27 Nxp B.V. System and method for sensing an amplifier load current
EP2538699B1 (fr) 2011-06-22 2015-11-11 Nxp B.V. Contrôle de la sortie d'un haut-parleur
KR101469545B1 (ko) * 2011-09-06 2014-12-05 삼성전자주식회사 오디오 신호 처리 방법 및 그에 따른 오디오 신호 처리 장치
EP2760220B1 (fr) * 2011-09-22 2016-02-10 Panasonic Intellectual Property Management Co., Ltd. Dispositif de reproduction du son
US8913752B2 (en) * 2012-03-22 2014-12-16 Htc Corporation Audio signal measurement method for speaker and electronic apparatus having the speaker
US9654064B2 (en) * 2012-12-18 2017-05-16 Panasonic Automotive Systems Company Of America, Division Of Panasonic Corporation Of North America Amplifier apparatus with controlled negative output impedance
US9386387B2 (en) * 2013-05-23 2016-07-05 Listen, Inc. Audio measurement amplifier
US9374634B2 (en) 2014-07-10 2016-06-21 Nxp B.V. System for controlling displacement of a loudspeaker
JP6210027B2 (ja) 2014-07-18 2017-10-11 ヤマハ株式会社 電力増幅器
GB201712391D0 (en) 2017-08-01 2017-09-13 Turner Michael James Controller for an electromechanical transducer

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Publication number Priority date Publication date Assignee Title
US3872247A (en) * 1971-05-20 1975-03-18 Robert W Saville Low cost of high fidelity high power variable class a amplifier-speaker combination
JPS6134749Y2 (fr) * 1979-09-28 1986-10-09
DE3339108A1 (de) * 1983-10-28 1985-05-09 Standard Elektrik Lorenz Ag, 7000 Stuttgart Tonwiedergabesystem
NL8401041A (nl) * 1984-04-03 1985-11-01 Philips Nv Elektro-akoestische inrichting.
SE450613B (sv) * 1986-03-20 1987-07-06 Goran Hahne Forfarande och kretsanordning for att forbettra frekvensatergivningen hos en audio-basforsterkare
GB2189967A (en) * 1986-04-09 1987-11-04 David Clifford Lane Loudspeaker
DE3637666A1 (de) * 1986-11-05 1988-05-19 Joachim Rieder Phasen- und amplituden-geregelter lautsprecher mit beliebig vielen wegen
JPS6490700A (en) * 1987-09-30 1989-04-07 Yamaha Corp Motional load driving circuit

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5206912A (en) * 1989-06-20 1993-04-27 Yamaha Corporation Power amplifier adapter
US5226089A (en) * 1990-04-16 1993-07-06 Samsung Electronics Co., Ltd. Circuit and method for compensating low frequency band for use in a speaker
CN106105260A (zh) * 2014-03-04 2016-11-09 万络机电公司 用于对至少一个扬声器的供应电路中的谐振峰值进行滤波的装置和方法
CN106105260B (zh) * 2014-03-04 2019-08-16 万络机电公司 用于对至少一个扬声器的供应电路中的谐振峰值进行滤波的装置和方法
CN106063294A (zh) * 2014-03-05 2016-10-26 万络机电公司 用于在至少一个扬声器的上游对其供应电路中的谐振峰值进行滤波的装置和方法

Also Published As

Publication number Publication date
EP0366109A3 (fr) 1991-12-11
DE3836745A1 (de) 1990-05-03
US5068903A (en) 1991-11-26

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