EP0133948A1 - Procédé et dispositif pour la contreréaction de la tension induite par le mouvement de la membrane du haut-parleur - Google Patents

Procédé et dispositif pour la contreréaction de la tension induite par le mouvement de la membrane du haut-parleur Download PDF

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Publication number
EP0133948A1
EP0133948A1 EP84108638A EP84108638A EP0133948A1 EP 0133948 A1 EP0133948 A1 EP 0133948A1 EP 84108638 A EP84108638 A EP 84108638A EP 84108638 A EP84108638 A EP 84108638A EP 0133948 A1 EP0133948 A1 EP 0133948A1
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EP
European Patent Office
Prior art keywords
voltage
loudspeaker
current
network
impedance
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.)
Granted
Application number
EP84108638A
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German (de)
English (en)
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EP0133948B1 (fr
Inventor
Burkhard Dick
Dr. Paul Scherer Erbengemeinschaft
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.)
BURKHARD DICK TE HAMBURG EN ERBENGEMEINSCHAFT DR.
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Individual
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Priority to AT84108638T priority Critical patent/ATE46600T1/de
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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
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/002—Damping circuit arrangements for transducers, e.g. motional feedback circuits

Definitions

  • the loudspeaker diaphragm does not exactly follow the applied signal voltage, because the mechanical oscillation circuits, which are more or less firmly coupled to the diaphragm, tend to vibrate naturally when triggered by impulses, which are still disruptive even if they are caused by damping are significantly smaller than the actual signal.
  • the loudspeaker diaphragm has difficulties, e.g. to follow pulse-shaped signal voltages.
  • the transparency of the reproduction depends at least in the mid-range (200 Hz to 1 kHz) on the correct phase behavior, i.e. a loudspeaker should be able to reproduce rectangular sound pressure curves to a certain extent correctly in this frequency range.
  • Circuits for the feedback of a movement variable (e.g. the fast one) / 1 / have become known recently, in which a special converter (e.g. Accelerometer) was used.
  • a movement variable e.g. the fast one
  • a special converter e.g. Accelerometer
  • the object of the present invention is therefore to develop a network for the simulation of the braked loudspeaker, which consists only of capacitors and resistors and has the necessary accuracy up to the frequency range of approximately 50 kHz.
  • the loudspeaker in this circuit Fig.
  • FIG. 4a shows the typical locus of a loudspeaker that is braked. Their characteristic course is essentially due to the existence of eddy currents in the conductive core and magnetic material in the case of an AC-current-carrying coil.
  • R K and L K are frequency independent. At high frequencies, a different spatial field distribution will occur for each frequency f due to the field displacement (skin effect). The flux linkage with the original field and consequently L K and R K become frequency-dependent.
  • the impedance Z K can be described with sufficient accuracy by a network according to FIG. 4c. 3 to 5 chain links were sufficient for the speakers previously used.
  • this equivalent circuit diagram does not take into account any non-linearities. Above all, this includes field distortions with large modulation through the hysteresis, the dependence on the respective position of the voice coil due to inhomogeneous field behavior and temperature influence.
  • the individual elements of the simulation can be determined with little mathematical effort and good accuracy by the system's response to a defined "test signal".
  • Half the period must be chosen so large that the response of the system decays to a negligible final value during this time (Fig. 5a, 5b, 5c). If the voltage response U K (t) is now divided into n time ranges (n ⁇ number of the desired chain links) with 2 base values each, the impedance Z K can be easily calculated using a permissible approximation method / 4 /.
  • FIG. 6 An application example for a 13 cm TT can be seen in FIG. 6.
  • the movement voltage UM induced in the voice coil contains, in addition to the distortion-related deviations, above all the portion that is determined by the mechanical resonance system (membrane together with the voice coil, suspension) and the coupled housing (FIG. 3b).
  • This can be indicated by an electrical resonant circuit with constant loss resistance, as long as the frequency-dependent losses due to radiation in the range of; Fundamental resonance can be neglected. Therefore, if you only want to correct the basic behavior of a loudspeaker in which the influence of the linear mass-spring system dominates by far over the non-linearities, it is sufficient to do this by a network AM (Fig.
  • FIG. 7a 1 adder, 2 voltage-controlled Power source with power amplifier, 3 loudspeakers, 4 network to simulate the linear portion of the motion voltage, feedback amplifier) of the same quality and resonance frequency (Fig. 7b). If the radiation impedance Z s plays a role, it can be taken into account according to FIG. 7c. In addition, the electrical compensation of the resistance R necessary for the current injection brings about an additional improvement in the reproduction quality (FIG. 8).
  • This method is particularly suitable for loudspeakers in the mid-range and high-frequency range, which in themselves show good distortion factor behavior and in which the system is isolated from the influences of the loudspeaker housing by encapsulation. An application example for a mid-tone dome is shown in FIG. 8.
  • Another way to gain the movement tension is to operate the loudspeaker a time-division multiplex both as a transmitter and as a receiver / 5 /.
  • the basic idea of the method is that the terminal voltage U L is keyed to the loudspeaker.
  • the keying frequency must be outside the listening range, e.g. 38 kHz.
  • the principle is first explained using a voltage source with purely ohmic internal resistance (Fig. 9: 1 linear gate circuit, 2 power amplifiers, 3 voltage sources with ohmic resistance, 4 low-pass filters).
  • the internal induction voltage can then be sampled in proportion to the current using a small measuring resistor (FIG. 10a).
  • the impedance of the braked loudspeaker contains inductances (Fig. 4c)
  • the stored inductive energy results in a time-increasing decaying interference voltage after switching off the terminal voltage, the effect of which disturbs the measurement of the movement voltage (Fig. 10b).
  • the stored reactive energy reduces the crosstalk attenuation between the "transmit and receive channel".
  • One way to improve "crosstalk" is to scan during the shutdown phase To select the point in time so that the lowest-disturbance value of the movement voltage is recorded (Fig. 10b). This is then regenerated by a downstream low-pass filter.
  • FIG. 11 A detailed block diagram, in which reference was made to FIG. 2, shows FIG. 11: 1 adder, 2 linear gate circuit, 3 voltage-controlled current source with output amplifier, 4 loudspeakers, 5 simulation network, 6 ideal samplers, 7 low-pass filters, 8 feedback amplifiers.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
EP84108638A 1983-07-22 1984-07-21 Procédé et dispositif pour la contreréaction de la tension induite par le mouvement de la membrane du haut-parleur Expired EP0133948B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84108638T ATE46600T1 (de) 1983-07-22 1984-07-21 Verfahren und einrichtung zur gegenkopplung der bewegungsspannung eines lautsprechers.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833326494 DE3326494A1 (de) 1983-07-22 1983-07-22 Kontrolle der membranbewegung des dynamischen lautsprechers durch ein verbessertes netzwerk zur nachbildung seiner eingangsimpedanz
DE3326494 1983-07-22

Publications (2)

Publication Number Publication Date
EP0133948A1 true EP0133948A1 (fr) 1985-03-13
EP0133948B1 EP0133948B1 (fr) 1989-09-20

Family

ID=6204681

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84108638A Expired EP0133948B1 (fr) 1983-07-22 1984-07-21 Procédé et dispositif pour la contreréaction de la tension induite par le mouvement de la membrane du haut-parleur

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Country Link
EP (1) EP0133948B1 (fr)
AT (1) ATE46600T1 (fr)
DE (2) DE3326494A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0181608A1 (fr) * 1984-11-07 1986-05-21 BBE Sound, Inc. Système de correction et méthode d'un amplificateur avec une charge de référence
GB2196815A (en) * 1986-09-25 1988-05-05 David Robin Birt Motional feedback system for loudspeakers
WO2008007312A1 (fr) * 2006-07-10 2008-01-17 Bobinados De Transformadores S.L. Amplificateur de puissance

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004021546A1 (de) * 2004-05-03 2005-12-08 Avantgarde Acoustic Lautsprechersysteme Gmbh Hornlautsprecher

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2828520A1 (de) * 1978-06-29 1980-01-10 Hermann Dipl Ing Tropf Verfahren zur regelung von elektrodynamischen gebern
AU512725B2 (en) * 1976-06-08 1980-10-23 E. Hermann Keith Voice coil amplifier
DE2922112A1 (de) * 1979-05-31 1980-12-04 Wolfgang Scholl Regelungsverfahren fuer lautsprecher
US4393353A (en) * 1979-09-28 1983-07-12 Victor Company Of Japan, Ltd. Negative feedback amplifying circuit having voltage negative feedback and current negative feedback circuits

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA982055A (en) * 1972-09-11 1976-01-20 Toshiyuki Goto Sound reproducing system
DE2420689C3 (de) * 1974-04-29 1984-09-20 Arndt 7500 Karlsruhe Klingelnberg Verfahren und Anordnung zur Verbesserung der Eigenschaften elektrodynamischer Wandler durch Bewegungsgegenkopplung
DE3021007C2 (de) * 1980-05-31 1984-05-17 ANT Nachrichtentechnik GmbH, 7150 Backnang Schaltungsanordnung mit Verstärker und Übertrager

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU512725B2 (en) * 1976-06-08 1980-10-23 E. Hermann Keith Voice coil amplifier
DE2828520A1 (de) * 1978-06-29 1980-01-10 Hermann Dipl Ing Tropf Verfahren zur regelung von elektrodynamischen gebern
DE2922112A1 (de) * 1979-05-31 1980-12-04 Wolfgang Scholl Regelungsverfahren fuer lautsprecher
US4393353A (en) * 1979-09-28 1983-07-12 Victor Company Of Japan, Ltd. Negative feedback amplifying circuit having voltage negative feedback and current negative feedback circuits

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
FUNKSCHAU, Nr. 14, Juli 1983, München; P. RIEDEL "Membrangegenkopplung - neu aufgelegt", Seiten 53-56 *
PATENT ABSTRACTS OF JAPAN, vol. 5, no. 23, 12 February 1981, & JP-A-55-149594 (MATSUSHITA DENKI SANGYO K.K.) 20-11-1980 *
PATENT ABSTRACTS OF JAPAN, vol. 7, no. 13, 19 January 1983, & JP-A-57-170692 (MATSUSHITA DENKI SANGYO K.K.) 20-10-1982 *
PATENT ABSTRACTS OF JAPAN, vol. 7, no. 84, 8 April 1983, & JP-A-58-012499 (MATSUSHITA DENKI SANGYO K.K.) 24-01-1983 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0181608A1 (fr) * 1984-11-07 1986-05-21 BBE Sound, Inc. Système de correction et méthode d'un amplificateur avec une charge de référence
GB2196815A (en) * 1986-09-25 1988-05-05 David Robin Birt Motional feedback system for loudspeakers
WO2008007312A1 (fr) * 2006-07-10 2008-01-17 Bobinados De Transformadores S.L. Amplificateur de puissance

Also Published As

Publication number Publication date
DE3326494C2 (fr) 1991-02-14
EP0133948B1 (fr) 1989-09-20
ATE46600T1 (de) 1989-10-15
DE3326494A1 (de) 1985-01-31
DE3479855D1 (en) 1989-10-26

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