DE874607C - Negative feedback arrangement to improve the fidelity of loudspeakers - Google Patents

Negative feedback arrangement to improve the fidelity of loudspeakers

Info

Publication number
DE874607C
DE874607C DEK3770D DEK0003770D DE874607C DE 874607 C DE874607 C DE 874607C DE K3770 D DEK3770 D DE K3770D DE K0003770 D DEK0003770 D DE K0003770D DE 874607 C DE874607 C DE 874607C
Authority
DE
Germany
Prior art keywords
negative feedback
loudspeaker
voltage
transformer
fidelity
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.)
Expired
Application number
DEK3770D
Other languages
German (de)
Inventor
Ulrich Dipl-Ing Knick
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to DEK3770D priority Critical patent/DE874607C/en
Application granted granted Critical
Publication of DE874607C publication Critical patent/DE874607C/en
Expired 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; 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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback
    • H03F1/36—Negative-feedback-circuit arrangements with or without positive feedback in discharge-tube amplifiers

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)

Description

Gegenkopplungsanordnung zur Verbesserung der Wiedergabetreue von Lautsprechern Es ist bekannt, die Wiedergabetreue von Lautsprechern dadurch zu verbessern, daß eine durch die mechanische Bewegung des Lautsprechersystems erzeugte Spannung, die sog. Bewegungsspannung, zur Gegenkopplung auf den den Lautsprecher speisenden Verstärker benutzt wird. Zur Erzeugung dieser Bewegungsspannung hat man besondere mit dem Antriebssystem verbundene elektromechanische Geber, Hilfswicklungen auf der Antriebsspule oder Brückenanordnungen vorgeschlagen. Durch die Brückenanordnungen sollen die Verlustwiderstände des Lautsprechers bei der Erzeugung der Gegenkoppelspannung auskompensiert werden, so daß nur die Bewegungsspannung eine Gegenkopplung hervorruft. Die vorgeschlagenen Brücken enthalten zu diesem Zweck außer dem Lautsprecherantriebssystem eine Nachbildung des Lautsprecherverlustwiderstandes sowie zwei weitere Widerstände. Ein Nachteil dieses Verfahrens ist der zusätzlich tonfrequente Energieverbrauch der drei Brückenwiderstände, um den sich die dem Lautsprecher zuführbare Leistung vermindert.Negative feedback arrangement to improve the fidelity of loudspeakers It is known to improve the fidelity of speakers in that a tension generated by the mechanical movement of the loudspeaker system, the so-called motion voltage, for negative feedback to the amplifier feeding the loudspeaker is used. To generate this motion tension, one has special with the drive system connected electromechanical encoders, auxiliary windings on the drive coil or Bridge arrangements proposed. The loss resistances should be due to the bridge arrangements of the loudspeaker are compensated for when generating the negative feedback voltage, so that only the motion tension causes a negative feedback. The proposed For this purpose, bridges contain a replica in addition to the loudspeaker drive system the loudspeaker loss resistance and two other resistances. A disadvantage this method is the additional audio frequency energy consumption of the three bridge resistors, by which the power that can be fed to the loudspeaker is reduced.

Dieser Nachteil wird erfindungsgemäß bei Lautsprechern, die über einen Transformator gespeist werden, dadurch vermieden, daß der Verlustwiderstand der Sekundärwicklung des Transformators zur Nachbildung des Lautsprecherverlustwiderstanden ausgenutzt wird, und an Stelle der übrigen Brückenwiderstände eine praktisch leerlaufende zusätzliche Hilfswicklung auf dem Transformator angebracht wird. Diese Hilfswicklung wird so geschaltet; daß die Differenz zwischen der Klemmenspannung des Lautsprechers und ihrer Spannung zur Gegenkopplung benutzt wird, und so bemessen, daß ihre Spannung gleich der Leerlaufspannung der mit dem Lautsprecher verbundenen Sekundärwicklung ist, vermindert um den Spannungsabfall am Eigenwiderstand der Sekundärwicklung bei festgehaltenemAntriebssystem gleich Null, dagegen wird die durch die mechanische Bewegung im Antriebssystem erzeugte elektromotorische Gegenspannung nicht auskompensiert und wirkt gegenkoppelnd. Ein zusätzlicher tonfrequenter Energieverbrauch durch die Brückenanordnung tritt bei dieser erfindungsgemäßen Anordnung nicht auf. Es ist zweckmäßig; die Kompensation nicht vollständig durchzuführen und auch bei festgehaltenem Lautsprechersystem eine geringe Gegenkopplung zu belassen. Zur zweckmäßigen Weiterbildung der Anordnung können geeignete Schaltelemente, insbesondere eine Drosselspule, zwischen Sekundärwicklung des Transformators und Lautsprecher geschaltet werden. Sie können zur genaueren Realisierung der erforderlichen Nachbildung oder auch zur willkürlichen Beeinflussung des Frequenzganges, z. B. als Tonblende, benutzt werden.This disadvantage is according to the invention in speakers that have a Transformer powered are avoided by the loss of resistance the secondary winding of the transformer to simulate the loudspeaker loss resistance is used, and instead of the other bridge resistances, a practically no-load one additional auxiliary winding is attached to the transformer. This auxiliary winding is switched like this; that the difference between the terminal voltage of the speaker and their voltage is used for negative feedback, and so dimensioned that their voltage equal to the open circuit voltage of the secondary winding connected to the loudspeaker is reduced by the voltage drop at the inherent resistance of the secondary winding fixed drive system is zero, whereas the mechanical Movement in the drive system generated counter electromotive voltage not compensated and acts counter-coupling. An additional audio frequency energy consumption by the Bridge arrangement does not occur in this arrangement according to the invention. It is expedient; the compensation can not be carried out completely and even if it is held Loudspeaker system to leave a low negative feedback. For expedient further training the arrangement can suitable switching elements, in particular a choke coil, between Secondary winding of the transformer and loudspeaker are switched. You can for the more precise realization of the required replica or for the arbitrary one Influencing the frequency response, e.g. B. be used as a tone screen.

Claims (3)

PATENTANSPRÜCHE: r. Gegenkopplungsanordnung zur Verbesserung der Wiedergabetreue von Lautsprechern, die über einen Transformator von einem Verstärker gespeist werden, dadurch gekennzeichnet, daß die Differenz der Klemmenspannung des Lautsprechers und der Spannung einer zusätzlich auf dem Transformator angebrachten Hilfswicklung zur Gegenkopplung benutzt wird; und die Hilfswicklung so bemessen ist, daß ihre Spannung gleich oder etwas kleiner ist als die Klemmenspannung des Lautsprechers bei festgehaltenem Antriebssystem. PATENT CLAIMS: r. Negative feedback arrangement to improve fidelity from loudspeakers fed by an amplifier via a transformer, characterized in that the difference in the terminal voltage of the loudspeaker and the voltage of an additional auxiliary winding attached to the transformer is used for negative feedback; and the auxiliary winding is dimensioned so that its Voltage is equal to or slightly less than the terminal voltage of the speaker with the drive system held. 2. Anordnung nach Anspruch i, dadurch gekennzeichnet, daß zwischen der Sekundärwicklung des Transformators und dem Lautsprecher zusätzliche Schaltelemente zur Beeinflussung des Frequenzganges angeordnet sind. 2. Arrangement according to claim i, characterized in that that additional between the secondary winding of the transformer and the loudspeaker Switching elements are arranged to influence the frequency response. 3. Anordnung nach Anspruch 2, dadurch gekennzeichnet, daß die zusätzlichen Schaltelemente betheilbar sind. Angezogene Druckschriften: Deutsche Patentschrift Nr. 70753S; »Funkschau« 1940, S. q:5, Abb. 5.3. Arrangement according to claim 2, characterized in that the additional switching elements can be included are. References: German Patent No. 70753S; »Funkschau« 1940, p. Q: 5, fig. 5.
DEK3770D 1943-05-15 1943-05-15 Negative feedback arrangement to improve the fidelity of loudspeakers Expired DE874607C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEK3770D DE874607C (en) 1943-05-15 1943-05-15 Negative feedback arrangement to improve the fidelity of loudspeakers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEK3770D DE874607C (en) 1943-05-15 1943-05-15 Negative feedback arrangement to improve the fidelity of loudspeakers

Publications (1)

Publication Number Publication Date
DE874607C true DE874607C (en) 1953-04-23

Family

ID=7210038

Family Applications (1)

Application Number Title Priority Date Filing Date
DEK3770D Expired DE874607C (en) 1943-05-15 1943-05-15 Negative feedback arrangement to improve the fidelity of loudspeakers

Country Status (1)

Country Link
DE (1) DE874607C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2345544B2 (en) * 1972-09-11 1976-05-06 Matsushita Electric Ind Co Ltd SOUND REPRODUCTION SYSTEM

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE707538C (en) * 1937-07-13 1941-06-25 Telefunken Gmbh Amplifier with downstream electrodynamic loudspeaker

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE707538C (en) * 1937-07-13 1941-06-25 Telefunken Gmbh Amplifier with downstream electrodynamic loudspeaker

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2345544B2 (en) * 1972-09-11 1976-05-06 Matsushita Electric Ind Co Ltd SOUND REPRODUCTION SYSTEM
DE2345544C3 (en) * 1972-09-11 1976-12-23 Matsushita Electric Ind Co Ltd SOUND REPRODUCTION SYSTEM

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