EP0485010A1 - A filtering device for high frequency loudspeakers - Google Patents

A filtering device for high frequency loudspeakers Download PDF

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Publication number
EP0485010A1
EP0485010A1 EP91202795A EP91202795A EP0485010A1 EP 0485010 A1 EP0485010 A1 EP 0485010A1 EP 91202795 A EP91202795 A EP 91202795A EP 91202795 A EP91202795 A EP 91202795A EP 0485010 A1 EP0485010 A1 EP 0485010A1
Authority
EP
European Patent Office
Prior art keywords
loudspeaker
filtering device
resistor
high frequency
inductor
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.)
Withdrawn
Application number
EP91202795A
Other languages
German (de)
English (en)
French (fr)
Inventor
Giorgio Zampicinini
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.)
SONUS FABER Srl
Original Assignee
SONUS FABER Srl
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 SONUS FABER Srl filed Critical SONUS FABER Srl
Publication of EP0485010A1 publication Critical patent/EP0485010A1/en
Withdrawn legal-status Critical Current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
    • H04R3/12—Circuits for transducers, loudspeakers or microphones for distributing signals to two or more loudspeakers
    • H04R3/14—Cross-over networks

Definitions

  • the present invention relates to a filtering device for high frequency loudspeakers.
  • acoustical boxes for high fidelity installations require a minimum of a two-way system comprising one or more loudspeakers specifically suitable to reproduce the intermediate and high sound frequencies, as well as one or more loudspeakers capable of reproducing the low sound frequencies.
  • each loudspeaker is capable of reproducing with high fidelity only the sound frequencies contained in a specified range.
  • the rule is that the loudspeakers of small dimensions are capable of acting as diffusers for the high frequency sounds while the loudspeakers of large dimensions are capable of acting as diffuser elements for the low frequencies.
  • each loudspeaker On the feeding line of each loudspeaker there is placed a filtering device to ensure that the same loudspeaker be fed only by signals having frequencies corresponding to the frequency which the loudspeaker is capable of effectively reproducing.
  • These devices usually called “cross-over” devices comprise a high-path portion which feeds the loudspeaker and the loudspeakers which are intended to reproduce the high acoustical frequencies.
  • This filter essentially consists of a capacitor placed in series with the feeding line of the high frequency loudspeaker. In actual practice, it is also necessary to insert in series with the capacitor a resistor, a fact which necessarily causes damping of the signal.
  • the impedance of the filtering device on the loudspeaker in the rejection or shadow zone has a tendency to increase with the decrease of the frequency of the signal, preventing the passage of the lower frequencies. For this reason, the dumping factor of the loudspeaker becomes worse with the increase of the impedance discussed hereinabove.
  • the reactive component used in this filtering device of a known type is placed in series with the loudspeaker and therefore it crosses over with the signal to an extent which increases the more the signal is within a pass-band.
  • the object of the present invention is to provide a device capable of eliminating the drawbacks described hereinabove.
  • the crux of the present invention resides in providing a filtering device which comprises a resistor placed in series with the feeding line of the loudspeaker and downstream of the resistor there is an inductor placed directly parallel with respect to the loudspeaker.
  • Fig. 1 illustrates the conventional "cross-over" high-pass device which comprises a capacitor (1), placed in series with the feeding line of the high frequency loudspeaker (2).
  • a resistor (3) In practice, it is necessary to also insert in series with the capacitor a resistor (3), a fact which causes the drawbacks mentioned hereinabove.
  • inductor (8) is placed in parallel with the loudspeaker (2).
  • the inductor (8) has preferably an inductance value in the order of hundreds of ⁇ H.
  • resistor (3) which preferably has a value of resistance greater or equal to 6-7 ⁇ .
  • the resistor in the conventional filtering device the resistor could have been omitted, in the present case the resistor constitutes an essential element of the filtering device.
  • the reactive component which consists of the inductor, is placed parallel with the loudspeaker. This means that this component performs, with respect to the signal, a shunt or derivative function to an extent which decreases with the increase of the frequency and which therefore is close to zero when the signal is within the pass-band. Therefore, in the conventional case, the signal must cross the reactive component in order to feed the loudspeaker.
  • Another surprising and advantageous effect of the invention is due to the fact that, as shown in Fig. 3, the value of the impedance as a variation of frequency directly present at the terminals of the amplifier (which feeds in addition to loudspeaker (2) also one or more loudspeakers (4) for the average and low frequencies); without the device of the invention, shows values (5) which vary and have substantial lows and peaks, particularly in the interior of the resonance frequencies of the component (loudspeaker of low frequency) and the entire system (loudspeaker with low frequency and acoustical box).
  • the filtering device performs as a resistor which acts as a derivative shunt element on the resonance peaks. This results in a linearization as shown by curve (6) of the irregular values of the modulus of the impedance and this, in turn, permits the amplifier (7) to operate in a much better manner, since the load is then much more linear as a function of the frequency.
EP91202795A 1990-11-08 1991-10-29 A filtering device for high frequency loudspeakers Withdrawn EP0485010A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8563790 1990-11-08
IT08563790A IT1243159B (it) 1990-11-08 1990-11-08 Dispositivo di filtraggio per altoparlanti per alte frequenze

Publications (1)

Publication Number Publication Date
EP0485010A1 true EP0485010A1 (en) 1992-05-13

Family

ID=11329385

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91202795A Withdrawn EP0485010A1 (en) 1990-11-08 1991-10-29 A filtering device for high frequency loudspeakers

Country Status (3)

Country Link
EP (1) EP0485010A1 (zh-CN)
JP (1) JPH04267700A (zh-CN)
IT (1) IT1243159B (zh-CN)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2282022A (en) * 1993-09-21 1995-03-22 Mohammed Akhtar Loudspeaker cross-overs
WO1995015667A1 (fr) * 1993-12-01 1995-06-08 Dehaeze Jean Marie Perfectionnement a l'interface 'amplificateur de puissance-enceinte acoustique'
EP1097510A1 (en) * 1998-07-23 2001-05-09 Diaural, LLC Capacitor-less crossover network for electro-acoustic loudspeakers

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102172489B1 (ko) * 2019-06-25 2020-10-30 김환 크로스오버 네트워크, 이를 이용한 멀티웨이 스피커 시스템 및 오디오 시스템과 크로스오버 네트워크의 주파수 분할방법

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3067390A (en) * 1959-10-07 1962-12-04 Optimation Inc Low level frequency dividing network
EP0241994A1 (en) * 1986-04-09 1987-10-21 & W Loudspeakers Limited B Multi-way loudspeaker system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3067390A (en) * 1959-10-07 1962-12-04 Optimation Inc Low level frequency dividing network
EP0241994A1 (en) * 1986-04-09 1987-10-21 & W Loudspeakers Limited B Multi-way loudspeaker system

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
FUNKSCHAU vol. 54, no. 25, December 1982, MUNCHEN DE pages 52 - 55; R. SCH]TZ: 'Frequenzweichen f}r Lautsprecher' *
JOURNAL OF THE AUDIO ENGINEERING SOCIETY. vol. 26, no. 11, November 1978, NEW YORK US pages 850 - 855; J.K. HILLIARD AND H.R. KIMBALL: 'Dividing Networks for Loud Speaker Systems' *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2282022A (en) * 1993-09-21 1995-03-22 Mohammed Akhtar Loudspeaker cross-overs
GB2282022B (en) * 1993-09-21 1997-02-05 Mohammed Akhtar Filters
WO1995015667A1 (fr) * 1993-12-01 1995-06-08 Dehaeze Jean Marie Perfectionnement a l'interface 'amplificateur de puissance-enceinte acoustique'
FR2713431A1 (fr) * 1993-12-01 1995-06-09 Dehaeze Jean Marie Perfectionnement à l'interface "Amplificateur de puissance-enceinte acoustique".
US5822441A (en) * 1993-12-01 1998-10-13 Dehaeze; Jean-Marie Power amplifier/loudspeaker interface
EP1097510A1 (en) * 1998-07-23 2001-05-09 Diaural, LLC Capacitor-less crossover network for electro-acoustic loudspeakers
EP1097510A4 (en) * 1998-07-23 2005-09-14 Diaural Llc CAPACITOR-FREE FREQUENCY SOURCES FOR ELECTRIC ACOUSTIC LOUDSPEAKERS

Also Published As

Publication number Publication date
IT1243159B (it) 1994-05-24
IT9085637A1 (it) 1992-05-08
JPH04267700A (ja) 1992-09-24
IT9085637A0 (it) 1990-11-08

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