EP0039343A1 - Crossover circuit - Google Patents
Crossover circuitInfo
- Publication number
- EP0039343A1 EP0039343A1 EP19800901896 EP80901896A EP0039343A1 EP 0039343 A1 EP0039343 A1 EP 0039343A1 EP 19800901896 EP19800901896 EP 19800901896 EP 80901896 A EP80901896 A EP 80901896A EP 0039343 A1 EP0039343 A1 EP 0039343A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- circuit
- capacitor
- loudspeaker
- inductor
- reproduction
- 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- Withdrawn
Links
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 crossover circuit, for two or more loudspeaker elements, of the kind that, depending on the frequency, divides an incoming electric signal into two or more frequency bands, each of which are directed to that loudspeaker element which are arranged to reproduce the frequency band.
- the weakest link in the "chain” it is of course important, that every part of the sound equipment set-up achieve the capacity or standards stated.
- the loudspeakers in particular are the weakest link, which is- due to the fact that the loudspeakers work mechanically.
- the sound equipments have electrically and electronically been developed rapidly during the last few years, and today record players, tape recorders and amplifiers can be manufactured relatively unexpensive with the quality preserved.
- the loudspeaker elements which are mechanical components and work according to well-known principals since long, have not been subject to the same technical development. Every loudspeaker element is impaired by defects and has its own, often unique, reproduction characteristic.
- some kind of adapter circuit is usually required, and when several loudspeaker elements are connected to one and the same output or channel, there is also required a crossover circuit included into this adapter circuit.
- the crossover circuit directs electric signals with low frequencies to loudspeaker elements for low frequency reproduction, and electric signals with high frequencies to high frequency loudspeakers.
- the dividing filter directs the intermediate frequency register to the intermediate frequency loudspeaker.
- crossover circuits for two or more loudspeaker elements.
- the main task of such a crossover circuit is i.a. to achieve as constant an impedance as possible for the amplifier and to filter and direct different frequencies and frequency bands to the loudspeaker element(s), which are arranged to reproduce the frequency bands respectively.
- Today's crossover circuits are of varying success.
- the purpose of the present invention is to achieve a cross over circuit with which two or more loudspeaker elements can be managed, so that the original sound, i.e. the sound, which is originally produced by for example an orchestra and which has be-en recorded and stored on a tape, a record or the like, at playback is lead from an amplifier to two or more loudspeaker elements and is reproduced with as little distortion as possible.
- a purpose of the invention is thus to damp and to adjust the acoustic characteristic of the loudspeaker in the frequency band 300-1200 Hz. It is hereby important that the spacial information is reproduced as little distorted as possible.
- the number of components included in the dividing filter should also be as few as possible in order to facilitate and cheapen the production and also to make the dividing filter small and thereby easily located.
- This is solved by arranging in series with that or those loudspeaker element(s), which are arranged for intermediate and/or low frequency reproduction, and the circuit components connected to said loudspeaker elements, there is arranged at least one parallel resonance circuit including an inductor, a capacitor connected in parallel to said inductor, and a component circuit connected in parallel to the inductor and the capacitor, said component circuit consisting of a capacitor and a resistor, connected in series, and that there is arranged, parallel with said parallel resonance circuit and the loudspeaker element for intermediate and/or low frequency reproduction and thereto connected circuit components, at least one loudspeaker element for high frequency reproduction and thereto connected circuit components in order to achieve an efficient transient reproduction and also a good reproduction of the spacial information of the electric signal.
- Figure 1 shows a crossover circuit according to the invention, comprising two loudspeaker elements
- Figure 2 shows a crossover circuit, including three loudspeaker elements
- Figure 3 shows a four-way crossover circuit according to the invention.
- Figure 1 shows a passive crossover circuit, a two-way type, i.e. the crossover circuit includes two loudspeaker elements 1, 2.
- a first loudspeaker element 1, a high frequency element, is intended for reproduction of high frequencies, and a second loud speaker element 2, a low frequency element, is intended for reproduction of low and/or intermediate frequencies.
- a first and a second contact point 3, 4 to which external electric signals, which carry sound information, are led from e.g. an amplifier (not shown).
- a first component grid is arranged to control electrical signals with low frequencies to the low frequency speaker 2.
- the one connection of the low frequency speaker 2 is joined to the second contact point h of the crossover circuit.
- a capacitor 5 is connected in parallel to the low frequency speaker 2, and an inductor 6 is arranged in series with the low frequency speaker 2 and the capacitor 5.
- a further capacitor 7 is connected in parallel to the inductor 6, the first capacitor 5 and the low frequency speaker 2, respectively.
- a resistor 8 is connected in parallel with the capacitor 7.
- This circuit consisting of the capacitor 5, 7, the inductor 6, the low frequency speaker 2 and the resistor 8, is connected in series to a filter circuit, a parallel resonance circuit, comprising an inductor 9, whose opposite end is connected to the first contact point 3 of the crossover circuit, a circuit connected in parallel to the inductor 9 and the capacitor 10, said circuit consisting of a capacitor 11 connected in series with a resistor 12.
- the second component grid of the crossover circuit consists of four components besides the high frequency speaker 1.
- the component network is mainly arranged to provide the high frequency speaker 1 with electric high frequency signals and is constructed to function as a high pass filter.
- a capacitor 13 is connected to the high frequency speaker in series and an inductor 14 is arranged parallel with the capacitor 13 and the high frequency speaker 1.
- a further capacitor 15 is connected in series to the inductor 14, the capacitor 13 and the high frequency speaker 1.
- a resistor 16 is arranged in series with this capacitor 15. This component grid cuts signals with low frequencies. The resistor 16 is arranged to limit the power supply to the high frequency speaker 1.
- a crossover circuit which in the low and intermediate frequency register appears as a filter of the fourth degree and in the high frequency register appears as a fil ter of the third degree.
- signals with frequencies below and above the crossover frequency of the filter which, with a suitable component choice, is 2.600 Hz, are strictly defined from each other.
- the parallel resonance circuit i.e. the inductor 9, the capacitor 10, 11 and the resistor 12
- resonance phenomena are obtained, which i.a. cause a better transient reproduction from the high frequency speaker element 1 and a clearer reproduction of low and intermediate frequencies via a low or intermediate frequency speaker 2, 17.
- the parallel 1 resonance circuit electrically damps the acoustic characteristic of the loudspeakers, particularly in the frequency band 300-1200 Hz.
- the spacial sound information is hereby better reproduced.
- the signal, which passes through the crossover circuit is changed in so far as the transient characteristic of the high frequency speaker 1 shows a steeper rise of the positive flank of the signal, i.e. the rise time is shortened.
- connection, according to the invention, of a crossover circuit can, except in a two-way system, also be applied in a three- and fourway system, respectively, i.e. the crossover circuit can be placed in loudspeaker units where three, four or more loudspeaker elements are included. See figures 2 and 3. In both cases the parallel resonance circuit, with the inductor 9, the capacitor 10, 11 and the resistor 12, has been arranged in series with the loudspeaker element for intermediate frequency reproduction and the component grid connected thereto.
- Figure 2 shows a crossover circuit comprising three loudspeaker elements; one loudspeaker 18 for low frequency reproduction, one loudspeaker 17 for intermediate frequency reproduction and a third loudspeaker 19 for high frequency reproduction.
- the crossover circuit according to figure 2 can diagrammatically be divided into four component grids where the components, connected to the low frequency speaker 18, form a first component network, the components connected to the intermediate frequency speaker 17 form a second component network, the components connected to the high frequency speaker 19 form a third component network, and the components arranged between the first and the second component network form a fourth component network.
- the first component network consists of a low frequency speaker 18, an inductor 20 connected in series to said loudspeaker, a capacitor 21 connected in parallel with the inductor 20 and the low frequency speaker 18, and an inductor 22 connected in series with the capacitor 21, the inductor 20 and the low frequency speaker 18.
- the fourth component network consists of an inductor 23 connected in series to a capacitor 24 and to a capacitor 25, whose one leader-in is connected between the capacitor 24 and the inductor 23.
- This fourth component network is a high-pass filter and lets through signals with intermediate or high frequencies.
- the second component network includes, besides the parallel resonance circuit according to the invention, also a component circuit connected in parallel with the intermediate frequency speaker 17, said component circuit consisting of a capacitor 26 connected in series to a resistor 27.
- An inductor 28 is arranged in series with the intermediate frequency speaker 17, the capacitor 26 and the resistor 27.
- a further capacitor 29 is connected in parallel to the inductor 28 and the intermediate frequency speaker 17.
- the third component network comprises a high frequency speaker 19, a capacitor 30 connected in series to said speaker 19, and an inductor 31 connected in parallel to the capacitor 30 and the low frequency speaker 19.
- Another capacitor 32 is connected in series with the inductor 31, the capacitor 30 and the high frequency condenser 32.
- FIG. 3 shows an example of a crossover circuit for four loudspeaker elements.
- a further component grid has then been connected, which includes another high frequency element 34, an inductor 38 connected in parallel to said high frequency element, and a capacitor 35 connected in series to the inductor 38 and the high frequency element 34.
- This second high frequency element 34 and the filter components connected thereto are preferably dimensioned so that the component grid reproduce the highest audible frequencies, thus being a complement to the high frequency speaker 19, arranged in the three-way system.
- the four-way filter coincides principally with the three-way filter, yet with the difference that some of the components included in the crossover circuit must be given other values so that an adjusting of the signal transmission is achieved.
Landscapes
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
Un circuit de coupure est destine a etre monte des enceintes de haut-parleurs avec au moins deux elements de haut-parleurs (1, 2), et concu pour diviser un signal electrique d'entree par rapport a sa frequence. Des hautes frequences sont ainsi dirigees vers l'element de haut-parleur (1) prevu pour une reproduction de hautes frequences, et des basses frequences sont dirigees vers l'element de haut-parleur (2), prevu pour la reproduction des basses frequences et/ou des frequences intermediaires. De maniere a ameliorer la reproduction transitoire et egalement ameliorer la reproduction de l'information spatiale, sonore, in nouveau type de circuits paralleles de resonance a ete inclus dans le circuit de coupure. Le circuit parallele de resonance consiste essentiellement en un inducteur (9) monte en serie, un condensateur (10) connecte en parallele a l'inducteur, et un autre condensateur (11) en serie avec une resistance (12) est connecte en parallele auxdits inducteur et condensateur.A cutoff circuit is intended to be mounted on loudspeaker enclosures with at least two loudspeaker elements (1, 2), and designed to divide an electrical input signal with respect to its frequency. High frequencies are thus directed towards the loudspeaker element (1) intended for reproduction of high frequencies, and low frequencies are directed towards the loudspeaker element (2), intended for reproduction of low frequencies and / or intermediate frequencies. In order to improve the transient reproduction and also improve the reproduction of spatial and sound information, a new type of parallel resonance circuit has been included in the cut-off circuit. The parallel resonance circuit essentially consists of an inductor (9) mounted in series, a capacitor (10) connected in parallel to the inductor, and another capacitor (11) in series with a resistor (12) is connected in parallel to said inductors. inductor and capacitor.
Description
CROSSOVER CIRCUIT
Background of the invention
The present invention relates to a crossover circuit, for two or more loudspeaker elements, of the kind that, depending on the frequency, divides an incoming electric signal into two or more frequency bands, each of which are directed to that loudspeaker element which are arranged to reproduce the frequency band.
The technical development makes steady progress. In particular this applies to equipments for different kinds of sound reproduction, e.g. music. At construction and manufacture of amplifiers, record players, tape recorders, radio and TV sets etc., considerable work is done in order to develop the technique to make the equipments reproduce the original sound as close as possible, i.e. there is an aim to minimize the distortion. This concerns every part included in the sound equipment and of course also the loudspeaker unit, .which often consists of a box, preferably made of wood, comprising one or more loudspeaker element. When stereo sound is to be reproduced, at least two loudspeaker units are required. If the aim is to reproduce high quality music, sophisticated loudspeaker elements and electronic equipments are required today. As the reproduced sound cannot be better than what is achieved by. the weakest link in the "chain", it is of course important, that every part of the sound equipment set-up achieve the capacity or standards stated. In many sound equipment set-ups, the loudspeakers in particular are the weakest link, which is- due to the fact that the loudspeakers work mechanically.
The sound equipments have electrically and electronically
been developed rapidly during the last few years, and today record players, tape recorders and amplifiers can be manufactured relatively unexpensive with the quality preserved. The loudspeaker elements, however, which are mechanical components and work according to well-known principals since long, have not been subject to the same technical development. Every loudspeaker element is impaired by defects and has its own, often unique, reproduction characteristic. When connecting a loudspeaker element to sound equipments of different kinds, some kind of adapter circuit is usually required, and when several loudspeaker elements are connected to one and the same output or channel, there is also required a crossover circuit included into this adapter circuit. It is the task of the crossover circuit to direct electric signals with low frequencies to loudspeaker elements for low frequency reproduction, and electric signals with high frequencies to high frequency loudspeakers. In case also loudspeaker elements for intermediate frequency reproduction are used, the dividing filter directs the intermediate frequency register to the intermediate frequency loudspeaker.
There is today a number of different solutions of crossover circuits for two or more loudspeaker elements. The main task of such a crossover circuit is i.a. to achieve as constant an impedance as possible for the amplifier and to filter and direct different frequencies and frequency bands to the loudspeaker element(s), which are arranged to reproduce the frequency bands respectively. Today's crossover circuits are of varying success.
The purpose of the invention and its most important charac¬
The purpose of the present invention is to achieve a cross
over circuit with which two or more loudspeaker elements can be managed, so that the original sound, i.e. the sound, which is originally produced by for example an orchestra and which has be-en recorded and stored on a tape, a record or the like, at playback is lead from an amplifier to two or more loudspeaker elements and is reproduced with as little distortion as possible. A purpose of the invention is thus to damp and to adjust the acoustic characteristic of the loudspeaker in the frequency band 300-1200 Hz. It is hereby important that the spacial information is reproduced as little distorted as possible. The number of components included in the dividing filter should also be as few as possible in order to facilitate and cheapen the production and also to make the dividing filter small and thereby easily located. This is solved by arranging in series with that or those loudspeaker element(s), which are arranged for intermediate and/or low frequency reproduction, and the circuit components connected to said loudspeaker elements, there is arranged at least one parallel resonance circuit including an inductor, a capacitor connected in parallel to said inductor, and a component circuit connected in parallel to the inductor and the capacitor, said component circuit consisting of a capacitor and a resistor, connected in series, and that there is arranged, parallel with said parallel resonance circuit and the loudspeaker element for intermediate and/or low frequency reproduction and thereto connected circuit components, at least one loudspeaker element for high frequency reproduction and thereto connected circuit components in order to achieve an efficient transient reproduction and also a good reproduction of the spacial information of the electric signal.
Description of the drawxngs
The invention will in the following be described in a preferred embodiment with reference to attached drawings,
Figure 1 shows a crossover circuit according to the invention, comprising two loudspeaker elements, Figure 2 shows a crossover circuit, including three loudspeaker elements, and
Figure 3 shows a four-way crossover circuit according to the invention.
Description of embodiment
Figure 1 shows a passive crossover circuit, a two-way type, i.e. the crossover circuit includes two loudspeaker elements 1, 2. A first loudspeaker element 1, a high frequency element, is intended for reproduction of high frequencies, and a second loud speaker element 2, a low frequency element, is intended for reproduction of low and/or intermediate frequencies.
In one end of the crossover circuit there are arranged a first and a second contact point 3, 4, to which external electric signals, which carry sound information, are led from e.g. an amplifier (not shown). A first component grid is arranged to control electrical signals with low frequencies to the low frequency speaker 2. In this component grid the one connection of the low frequency speaker 2 is joined to the second contact point h of the crossover circuit. A capacitor 5 is connected in parallel to the low frequency speaker 2, and an inductor 6 is arranged in series with the low frequency speaker 2 and the capacitor 5.
These components form a low-pass filter and cut high
frequency signals. A further capacitor 7 is connected in parallel to the inductor 6, the first capacitor 5 and the low frequency speaker 2, respectively. A resistor 8 is connected in parallel with the capacitor 7. This circuit, consisting of the capacitor 5, 7, the inductor 6, the low frequency speaker 2 and the resistor 8, is connected in series to a filter circuit, a parallel resonance circuit, comprising an inductor 9, whose opposite end is connected to the first contact point 3 of the crossover circuit, a circuit connected in parallel to the inductor 9 and the capacitor 10, said circuit consisting of a capacitor 11 connected in series with a resistor 12.
The second component grid of the crossover circuit consists of four components besides the high frequency speaker 1. The component network is mainly arranged to provide the high frequency speaker 1 with electric high frequency signals and is constructed to function as a high pass filter. Hereby the one connection of the high frequency speaker 1 is joined to the second contact point 4 of the crossover circuit. A capacitor 13 is connected to the high frequency speaker in series and an inductor 14 is arranged parallel with the capacitor 13 and the high frequency speaker 1. A further capacitor 15 is connected in series to the inductor 14, the capacitor 13 and the high frequency speaker 1. A resistor 16 is arranged in series with this capacitor 15. This component grid cuts signals with low frequencies. The resistor 16 is arranged to limit the power supply to the high frequency speaker 1. With the construction of the crossover circuit in accordance with the invention, a crossover circuit is obtained, which in the low and intermediate frequency register appears as a filter of the fourth degree and in the high frequency register appears as a fil
ter of the third degree. This means that signals with frequencies below and above the crossover frequency of the filter which, with a suitable component choice, is 2.600 Hz, are strictly defined from each other.
By the set-up of the parallel resonance circuit, i.e. the inductor 9, the capacitor 10, 11 and the resistor 12, resonance phenomena are obtained, which i.a. cause a better transient reproduction from the high frequency speaker element 1 and a clearer reproduction of low and intermediate frequencies via a low or intermediate frequency speaker 2, 17. This is mainly due to the fact that the parallel 1 resonance circuit electrically damps the acoustic characteristic of the loudspeakers, particularly in the frequency band 300-1200 Hz. Also the spacial sound information is hereby better reproduced. The signal, which passes through the crossover circuit, is changed in so far as the transient characteristic of the high frequency speaker 1 shows a steeper rise of the positive flank of the signal, i.e. the rise time is shortened.
The connection, according to the invention, of a crossover circuit can, except in a two-way system, also be applied in a three- and fourway system, respectively, i.e. the crossover circuit can be placed in loudspeaker units where three, four or more loudspeaker elements are included. See figures 2 and 3. In both cases the parallel resonance circuit, with the inductor 9, the capacitor 10, 11 and the resistor 12, has been arranged in series with the loudspeaker element for intermediate frequency reproduction and the component grid connected thereto.
Figure 2 shows a crossover circuit comprising three loudspeaker elements; one loudspeaker 18 for low frequency reproduction, one loudspeaker 17 for intermediate
frequency reproduction and a third loudspeaker 19 for high frequency reproduction.
The crossover circuit according to figure 2 can diagrammatically be divided into four component grids where the components, connected to the low frequency speaker 18, form a first component network, the components connected to the intermediate frequency speaker 17 form a second component network, the components connected to the high frequency speaker 19 form a third component network, and the components arranged between the first and the second component network form a fourth component network. The first component network, then, consists of a low frequency speaker 18, an inductor 20 connected in series to said loudspeaker, a capacitor 21 connected in parallel with the inductor 20 and the low frequency speaker 18, and an inductor 22 connected in series with the capacitor 21, the inductor 20 and the low frequency speaker 18. Consequently the fourth component network consists of an inductor 23 connected in series to a capacitor 24 and to a capacitor 25, whose one leader-in is connected between the capacitor 24 and the inductor 23. This fourth component network is a high-pass filter and lets through signals with intermediate or high frequencies. The second component network includes, besides the parallel resonance circuit according to the invention, also a component circuit connected in parallel with the intermediate frequency speaker 17, said component circuit consisting of a capacitor 26 connected in series to a resistor 27. An inductor 28 is arranged in series with the intermediate frequency speaker 17, the capacitor 26 and the resistor 27. A further capacitor 29 is connected in parallel to the inductor 28 and the intermediate frequency speaker 17. The third component network comprises a high frequency speaker 19, a capacitor 30 connected in series to
said speaker 19, and an inductor 31 connected in parallel to the capacitor 30 and the low frequency speaker 19. Another capacitor 32 is connected in series with the inductor 31, the capacitor 30 and the high frequency condenser 32.
As mentioned above the crossover circuit, according to the invention, can also be modified so that four or more loudspeaker elements can be connected. Figure 3 shows an example of a crossover circuit for four loudspeaker elements. A further component grid has then been connected, which includes another high frequency element 34, an inductor 38 connected in parallel to said high frequency element, and a capacitor 35 connected in series to the inductor 38 and the high frequency element 34. This second high frequency element 34 and the filter components connected thereto, are preferably dimensioned so that the component grid reproduce the highest audible frequencies, thus being a complement to the high frequency speaker 19, arranged in the three-way system. The four-way filter coincides principally with the three-way filter, yet with the difference that some of the components included in the crossover circuit must be given other values so that an adjusting of the signal transmission is achieved.
The invention is of course not limited to the described embodiments but can be varied in a number of ways within he scope of the invention.
Claims
C L A I M
A crossover circuit, for two or more loudspeaker elements which, dependant on the frequency, divides an incoming electric signal into two or more frequency bands, each of which is provided with that/those loudspeaker element(s) which are arranged to reproduce the frequency bands, c h a r a c t e r i z e d t h e r e b y, that in series with that or those loudspeaker element (s) (2), which are arranged for intermediate and/or low frequency reproduction, and the circuit components (5, 6, 7, 8) connected to said loudspeaker elements, there is arranged at least one parallel resonance circuit including an inductor (9), a capacitor (10) connected in parallel to said inductor, and a component circuit connected in parallel to the inductor (9) and the capacitor (10), said component circuit consisting of a capacitor (11) and a resistor (12), connected in series, and that there is arranged, parallel with said parallel resonance circuit and the loudspeaker element (2) for intermediate and/or low frequency reproduction and thereto connected circuit components (5, 6, 7 , 8), at least one loudspeaker element (1) for high frequency reproduction and thereto connected circuit components ( 13» 14, 15) in order to achieve an efficient transient reproduction and also a good reproduction of the spacial information of the electric signal.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE7908049A SE416014B (en) | 1979-09-28 | 1979-09-28 | CROSSOVER |
| SE7908049 | 1979-09-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0039343A1 true EP0039343A1 (en) | 1981-11-11 |
Family
ID=20338918
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19800901896 Withdrawn EP0039343A1 (en) | 1979-09-28 | 1980-09-25 | Crossover circuit |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0039343A1 (en) |
| SE (1) | SE416014B (en) |
| WO (1) | WO1981000947A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4606071A (en) * | 1984-08-13 | 1986-08-12 | White Jr Lahroy A | Loudspeaker system utilizing an equalizer circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5545210A (en) * | 1978-09-27 | 1980-03-29 | Hitachi Ltd | Speaker system |
-
1979
- 1979-09-28 SE SE7908049A patent/SE416014B/en unknown
-
1980
- 1980-09-25 WO PCT/SE1980/000229 patent/WO1981000947A1/en unknown
- 1980-09-25 EP EP19800901896 patent/EP0039343A1/en not_active Withdrawn
Non-Patent Citations (1)
| Title |
|---|
| See references of WO8100947A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| SE416014B (en) | 1980-11-17 |
| WO1981000947A1 (en) | 1981-04-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6115475A (en) | Capacitor-less crossover network for electro-acoustic loudspeakers | |
| Self | The Design of Active Crossovers | |
| US5467400A (en) | Solid state audio amplifier emulating a tube audio amplifier | |
| GB2163621A (en) | Loudspeaker system utilizing an equalizer circuit | |
| AU667007B2 (en) | Sound system gain and equalization circuit | |
| US6310959B1 (en) | Tuned order crossover network for electro-acoustic loudspeakers | |
| US5327505A (en) | Multiple output transformers network for sound reproducing system | |
| US6775385B1 (en) | Loudspeaker frequency distribution and adjusting circuit | |
| JPS62277807A (en) | Method and circuit arrangement for improving radio frequencyreproducibility of low sound amplifier | |
| EP0039343A1 (en) | Crossover circuit | |
| US4843625A (en) | Sound reproduction systems | |
| Fincham | The subjective importance of uniform group delay at low frequencies | |
| WO2000005810A1 (en) | Series-configured crossover network for electro-acoustic loudspeakers | |
| JPS5814795B2 (en) | Multiway speaker drive circuit system | |
| JPH04267700A (en) | Filtering-device for high-frequency loud speaker | |
| JPS6035352Y2 (en) | reverberation device | |
| JPH062389Y2 (en) | Audio playback device | |
| Thiele | Applications of network synthesis to loudspeaker system theory | |
| JPH0221835Y2 (en) | ||
| JPH067667Y2 (en) | Audio playback device | |
| JPH067668Y2 (en) | Audio playback device | |
| JPH0145194Y2 (en) | ||
| RU2098923C1 (en) | Sound reproducing unit | |
| EP0013392A1 (en) | Dividing network | |
| McCure | Audio triamplification system. |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| AK | Designated contracting states |
Designated state(s): DE FR GB NL |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
| 18D | Application deemed to be withdrawn |
Effective date: 19811116 |
|
| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: QVICKLUND, LARS Inventor name: LILJEROTH, NILS |