EP0145997A2 - Dispositif de compensation d'erreurs de reproduction de transducteurs électroacoustiques - Google Patents

Dispositif de compensation d'erreurs de reproduction de transducteurs électroacoustiques Download PDF

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Publication number
EP0145997A2
EP0145997A2 EP19840114089 EP84114089A EP0145997A2 EP 0145997 A2 EP0145997 A2 EP 0145997A2 EP 19840114089 EP19840114089 EP 19840114089 EP 84114089 A EP84114089 A EP 84114089A EP 0145997 A2 EP0145997 A2 EP 0145997A2
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EP
European Patent Office
Prior art keywords
signals
circuit
digital
converter
microcomputer
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EP19840114089
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German (de)
English (en)
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EP0145997B1 (fr
EP0145997A3 (en
EP0145997B2 (fr
Inventor
Peter Michael Dipl.-Ing. Pfleiderer
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Pfleiderer Peter Michael Dipl-Ing
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Individual
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Priority claimed from DE19833343027 external-priority patent/DE3343027A1/de
Priority claimed from DE19843418047 external-priority patent/DE3418047C2/de
Application filed by Individual filed Critical Individual
Publication of EP0145997A2 publication Critical patent/EP0145997A2/fr
Publication of EP0145997A3 publication Critical patent/EP0145997A3/de
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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

Definitions

  • a significant advantage of the compensation circuit is also to be emphasized that it can be realized extremely inexpensively by only a few active components.
  • FIG. 7 shows a known loudspeaker equivalent circuit diagram with a differentiating stage connected downstream.
  • the values for the example with the bass loudspeaker are determined dynamically on the bass, ie the complex input impedance is measured at different frequencies and from this the component values for the known equivalent circuit are mathematically calculated.
  • the behavior of the equivalent circuit corresponds exactly to that of the loudspeaker itself.
  • the voltage U 1 is applied to the input terminals of the loudspeaker or its electrical exact replica by the equivalent circuit, the voltage U 2 can be tapped at the output terminals.
  • the error in the range of the sound pressure transmission curve is from 40 - 500 Hz less than o.l dB.
  • the error in the phase angle curve is less than + 10 ° in the range of 80 - 800 Hz.
  • the four decouplings A 0 , A 1 , A 2 and A 3 which have adjustable potentiometers P 4 , P 3 , P 2 and P 1 in their branches and in the Totalizer S 2 initiated will.
  • the output voltage U 2 can be tapped at the output of the summer S 2 .
  • Integrators are available as integrated circuit modules (e.g. TL 071 CP or TL 074 from Texas Instruments).
  • the three integrators do not follow one after the other, but only two. A third integrator is switched separately.
  • the modified circuit arrangement according to the invention according to FIG. 9d was not implemented with four integrators in series compared to the circuit arrangement according to the invention from FIG. 9c, but rather with two times two integrators arranged one behind the other.
  • the modified circuit arrangement according to FIG. 9e shows that an embodiment is also possible in which the integrators are not connected in series directly as in FIG. 9a, but each integrator is visible for itself in a circuit diagram closed by feedback and decoupling, and these circuit arrangements are then simply strung together.
  • This type of equivalent circuit constructed with discrete components can also be approximated by a compensation circuit according to the invention. Because there is no voice coil influence, you only get a second order approach. The coefficients are determined using the same iteration method.
  • the disadvantages of this circuit arrangement are that current-impressed amplifiers are not common because they are very difficult to dimension correctly and can easily become unstable. Damping the membrane movement by the current of the amplifier is not possible with current-impressed amplifiers, but it is possible with voltage-impressed amplifiers.
  • the digital signals DS1 entered into the computer which are now referred to as primary digital signals, are converted into secondary digital signals DS2 in accordance with the characteristic converter characteristic values. Conversions, however, only make sense if, for example, level jumps of the input signal U 1 occur or if its instantaneous oscillation frequency comes sufficiently close to a resonance frequency of the converter. Conversely, a conversion is not carried out if the input signal U 1 runs according to a sine function, the peak values of which are not subject to fluctuations, or are only insignificant.
  • the computer R requires at least three successive samples of the curve course of the input signal. He can then see both the steepness and the curvature of the curve. The changes in the curve shape of the input signal U 1 , which are of particular interest for the present purpose, can be determined by comparison with previous samples.
  • any necessary correction of the secondary digital signals DS2 should take place as early as possible, for example immediately after a detected level step, the input of the next two digital signals must be awaited for the conversion of the digital signal assigned to the first of three samples. This results in a delay that must be taken into account in addition to the pure computing time.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Amplifiers (AREA)
EP84114089A 1983-11-28 1984-11-22 Dispositif de compensation d'erreurs de reproduction de transducteurs électroacoustiques Expired - Lifetime EP0145997B2 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3343027 1983-11-28
DE19833343027 DE3343027A1 (de) 1983-11-28 1983-11-28 Verfahren und schaltungsanordnung zur verbesserung der wiedergabequalitaet von elektroakustischen wandlern
DE19843418047 DE3418047C2 (de) 1984-05-15 1984-05-15 Einrichtung zur Kompensation von Wiedergabefehlern eines elektroakustischen Wandlers
DE3418047 1984-05-15

Publications (4)

Publication Number Publication Date
EP0145997A2 true EP0145997A2 (fr) 1985-06-26
EP0145997A3 EP0145997A3 (en) 1987-09-30
EP0145997B1 EP0145997B1 (fr) 1991-11-06
EP0145997B2 EP0145997B2 (fr) 1996-01-10

Family

ID=25815960

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84114089A Expired - Lifetime EP0145997B2 (fr) 1983-11-28 1984-11-22 Dispositif de compensation d'erreurs de reproduction de transducteurs électroacoustiques

Country Status (4)

Country Link
US (1) US4675835A (fr)
EP (1) EP0145997B2 (fr)
JP (1) JPH07114519B2 (fr)
DE (1) DE3485242D1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2607344A1 (fr) * 1986-11-21 1988-05-27 Nexo Distribution Dispositif de traitement d'un signal electrique audiofrequence
EP0508392A3 (en) * 1991-04-09 1993-12-15 Klippel Wolfgang Circuit arrangement for correcting linear and non-linear transfer characteristics of electroacustic transducers
US20200413188A1 (en) * 2016-12-05 2020-12-31 Semiconductor Components Industries, Llc Reducing or eliminating transducer reverberation

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE422369B (sv) * 1979-08-03 1982-03-01 Arvid Lundbeck Anordning for kompensering av overforingsfunktion
US4914750A (en) * 1987-07-13 1990-04-03 Avm Hess, Inc. Sound transducer
US4953112A (en) * 1988-05-10 1990-08-28 Minnesota Mining And Manufacturing Company Method and apparatus for determining acoustic parameters of an auditory prosthesis using software model
US5247467A (en) * 1989-08-16 1993-09-21 Hewlett-Packard Company Multiple variable compensation for transducers
US5493620A (en) * 1993-12-20 1996-02-20 Pulfrey; Robert E. High fidelity sound reproducing system
DE19917584A1 (de) * 1999-04-19 2000-10-26 Siemens Ag Flächenlautsprecher und Verfahren zu dessen Betrieb
DE10045201C2 (de) * 2000-09-13 2002-08-14 Siemens Ag Akustische Wiedergabeeinrichtung
US6771781B2 (en) * 2001-05-08 2004-08-03 Daniel A. Chattin Variable damping circuit for a loudspeaker
DE20204259U1 (de) * 2002-03-16 2002-07-04 Seiffert, Jörg, 45131 Essen Schaltung zur akustischen Gruppenlaufzeit und damit des frequenzabhängigen Phasenverhaltens von Lautsprecherchassis und Lautsprecherboxen
US7825986B2 (en) * 2004-12-30 2010-11-02 Mondo Systems, Inc. Integrated multimedia signal processing system using centralized processing of signals and other peripheral device
US8015590B2 (en) 2004-12-30 2011-09-06 Mondo Systems, Inc. Integrated multimedia signal processing system using centralized processing of signals
US8880205B2 (en) * 2004-12-30 2014-11-04 Mondo Systems, Inc. Integrated multimedia signal processing system using centralized processing of signals
US7653447B2 (en) * 2004-12-30 2010-01-26 Mondo Systems, Inc. Integrated audio video signal processing system using centralized processing of signals
US10423229B2 (en) 2017-08-17 2019-09-24 Google Llc Adjusting movement of a display screen to compensate for changes in speed of movement across the display screen

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4882817A (fr) * 1972-01-20 1973-11-06
US3988541A (en) * 1975-01-14 1976-10-26 Iowa State University Research Foundation, Inc. Method and apparatus for frequency compensation of electro-mechanical transducer
US4052560A (en) * 1976-06-03 1977-10-04 John Bryant Santmann Loudspeaker distortion reduction systems
US4109107A (en) * 1977-07-05 1978-08-22 Iowa State University Research Foundation, Inc. Method and apparatus for frequency compensation of electro-acoustical transducer and its environment
US4340778A (en) * 1979-11-13 1982-07-20 Bennett Sound Corporation Speaker distortion compensator
US4316060A (en) * 1980-01-04 1982-02-16 Dbx, Inc. Equalizing system
US4391124A (en) * 1981-02-26 1983-07-05 Cornell Research Foundation, Inc. Electroacoustic transducer calibration method and apparatus
US4434648A (en) * 1981-02-26 1984-03-06 Cornell Research Foundation, Inc. Electroacoustic transducer calibration method and apparatus
US4417214A (en) * 1981-04-13 1983-11-22 National Semiconductor Corporation Monolithic IC general purpose active filter
US4481662A (en) * 1982-01-07 1984-11-06 Long Edward M Method and apparatus for operating a loudspeaker below resonant frequency
US4458362A (en) * 1982-05-13 1984-07-03 Teledyne Industries, Inc. Automatic time domain equalization of audio signals
US4446715A (en) * 1982-06-07 1984-05-08 Camino Laboratories, Inc. Transducer calibration system
NL8303186A (nl) * 1983-09-15 1985-04-01 Philips Nv Luidsprekersysteem en een luidspreker te gebruiken in een luidspreker voor het omzetten van een in n bits gedigitaliseerd electrisch signaal in een akoestisch signaal.
NL8303185A (nl) * 1983-09-15 1985-04-01 Philips Nv Hybried luidsprekersysteem eventueel met een of meer korrektieketens.
US4558426A (en) * 1983-12-14 1985-12-10 Mcdonnell Douglas Corporation Transducer multiplexer

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2607344A1 (fr) * 1986-11-21 1988-05-27 Nexo Distribution Dispositif de traitement d'un signal electrique audiofrequence
WO1988004124A1 (fr) * 1986-11-21 1988-06-02 Nexo Distribution Dispositif de traitement d'un signal electrique audiofrequence
GB2230402A (en) * 1986-11-21 1990-10-17 Nexo Distribution Device for processing an electric audiofrequency signal
US4995113A (en) * 1986-11-21 1991-02-19 Nexo Distribution Device for processing an audio-frequency electrical signal
GB2230402B (en) * 1986-11-21 1991-04-17 Nexo Distribution Device for processing an audio-frequency electrical signal
EP0508392A3 (en) * 1991-04-09 1993-12-15 Klippel Wolfgang Circuit arrangement for correcting linear and non-linear transfer characteristics of electroacustic transducers
US20200413188A1 (en) * 2016-12-05 2020-12-31 Semiconductor Components Industries, Llc Reducing or eliminating transducer reverberation

Also Published As

Publication number Publication date
EP0145997B1 (fr) 1991-11-06
DE3485242D1 (de) 1991-12-12
EP0145997A3 (en) 1987-09-30
JPS60134699A (ja) 1985-07-17
JPH07114519B2 (ja) 1995-12-06
EP0145997B2 (fr) 1996-01-10
US4675835A (en) 1987-06-23

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