EP0677978A2 - Appliance for signal transmission from an amplifier to a loudspeaker - Google Patents

Appliance for signal transmission from an amplifier to a loudspeaker Download PDF

Info

Publication number
EP0677978A2
EP0677978A2 EP95105163A EP95105163A EP0677978A2 EP 0677978 A2 EP0677978 A2 EP 0677978A2 EP 95105163 A EP95105163 A EP 95105163A EP 95105163 A EP95105163 A EP 95105163A EP 0677978 A2 EP0677978 A2 EP 0677978A2
Authority
EP
European Patent Office
Prior art keywords
cable
amplifier
loudspeaker
conductors
return
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
EP95105163A
Other languages
German (de)
French (fr)
Other versions
EP0677978A3 (en
EP0677978B1 (en
Inventor
Hans M. Strassner
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
Publication of EP0677978A2 publication Critical patent/EP0677978A2/en
Publication of EP0677978A3 publication Critical patent/EP0677978A3/en
Application granted granted Critical
Publication of EP0677978B1 publication Critical patent/EP0677978B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00Circuits for transducers, loudspeakers or microphones
    • H04R3/12Circuits for transducers, loudspeakers or microphones for distributing signals to two or more loudspeakers

Definitions

  • the invention relates to a device for signal transmission from an amplifier to a loudspeaker according to the preamble of patent claim 1.
  • a loudspeaker cable is intended to transmit the signal delivered by the amplifier in all frequency ranges in an unadulterated manner.
  • hi-fi power amplifiers are fundamentally voltage amplifiers with a higher current carrying capacity and have an output resistance that goes towards 0 ohms, but loudspeakers generate a sound signal that is proportional to the voice coil current
  • the electrical properties of a speaker cable can be determined by the Describe the resistance covering, the dissipation covering, the inductance covering and the capacitance covering.
  • the ohmic resistance of the cable is determined by the conductivity of the conductor material and its geometric dimensions. The derivation is due to the dielectric losses, while the inductive resistance of the cable is a consequence of the magnetic field that is built up by the electrical current flow.
  • the inductive resistance increases with increasing frequency and leads to a phase shift between current and voltage.
  • phase errors in the transmission of a signal spectrum are particularly critical. Phase errors cause the location to blur both in width and depth of the room. Because the ear is not only based on the differences in intensity, but also on the phase relationship between the fundamental and overtones. In this respect, high demands are placed on the transmission behavior of loudspeaker cables.
  • the invention has for its object to provide a device for signal transmission from an amplifier to a speaker, with which the signals can be transmitted almost unadulterated.
  • the device according to the invention has an outgoing conductor for the forwarding of the electrical signals and a return conductor for the return of the electrical signals that form a cable harness.
  • the forward and return conductors are enclosed by a common ferrite sheathing, so that the residual stray fields are compensated for by the high magnetic coupling of the conductors. It has been shown in listening tests that the transmission properties of the device are audibly improved by the magnetic coupling. This manifests itself in improved location and a warmer sound.
  • the cable advantageously consists of several strands that are connected in parallel.
  • Each cable harness in turn preferably consists of a plurality of forward and return conductors which are electrically connected to one another at their ends.
  • the individual forward and return conductors should be arranged close to each other. Additional stranding or twisting of the conductors leads to a further reduction in inductance.
  • Enamel-insulated copper wire high-frequency stranded wire is particularly advantageous here.
  • the sheathing advantageously consists of a chain of ferrite cores which are lined up on the cable harness or on the cable harnesses. If the cable has only one cable harness, pipe cores can be used as sheathing. In a preferred embodiment with two cable strands, the strands are guided through the two openings by ferrite double-hole cores.
  • the device according to the invention preferably has an attenuator which suppresses the tendency to oscillate of the amplifier and is provided at the loudspeaker end of the cable.
  • the attenuator ohmic loads the series resonant circuit with increasing frequency, so that the quality value is greatly reduced (Q ⁇ 1) and self-excitation can no longer be excited.
  • the attenuator is preferably an R / C series link. It should be dimensioned so that it acts as a low-ohmic load for the critical frequency range of 1-5 MHz, in which the amplifier can exhibit an oscillator-like behavior as a result of the phase shift, and dampens the series resonant circuit more strongly. To increase security, several R / C series links with different corner frequencies are advantageously used in parallel.
  • the device for signal transmission from an amplifier to a loudspeaker on the amplifier-side or loudspeaker-side cable end has a tuning element, which consists of a series inductance (L) and / or a series resistance (R).
  • the device for signal transmission from an amplifier to a loudspeaker consists of a cable 1 with a sheath 2 made of magnetically conductive material and a tuning element 3 at the amplifier end of the cable and an attenuator 4 at the loudspeaker end of the cable.
  • Fig. 1 shows the cable 1 with the connection housings 5,6, which accommodate the tuning member 3 and the attenuator 4.
  • Short connection cables 7,8 with suitable plugs 9, 10 protrude from the connection housings 5, 6 for connecting the amplifier or the loudspeaker.
  • the cable 1 has two cable strands 11, 11 ', each consisting of three outgoing lines 12, 12' for the forwarding of the electrical signals and three return lines 13, 13 'for the return line of the electrical signals.
  • the forward conductors 12, 12 'and the return conductors 13, 13' of each cable harness 11, 11 ' are each arranged in pairs and wound around a textile thread in a common lay direction.
  • the forward conductors 12, 12 'of the two cable strands 11, 11' are electrically connected to one another at their ends, and the return conductors 13, 13 'of the two cable strands 11, 11' are electrically connected to one another at their ends.
  • the forward and return conductors 12, 12 ', 13, 13' are strands of ninety twisted enamelled copper wires. Since the conductors consist of a large number of individual conductors, the surface of the conductors is enlarged, which reduces the skin effect. At the same time, the magnetic fields arising from each individual line compensate each other and thereby reduce the inductance.
  • Fig. 3 shows a section through the double-hole ferrite cores 16, which are lined up on the two cable strands 11, 11 'and form the sheath 2 made of magnetically conductive material.
  • the ferrite cores 16 have an essentially rectangular profile and are provided with two parallel recesses 15, 15 'which receive the cable strands with the outgoing and return conductors.
  • FIG. 5 shows the block diagram of the device for signal transmission from an amplifier 17 to a loudspeaker 22.
  • the contacting of the forward and return conductors 12, 12 ', 13, 13' takes place with contacting elements 18, 18 'in the amplifier and loudspeaker-side connection housings 5.6 are provided.
  • the cable ends of the common forward conductors 12, 12 ' are electrically connected to the contacting elements 18 and the cable ends of the common return conductors 13, 13' are electrically connected to the contacting elements 18 '.
  • the speaker-side connection housing 6 also contains the attenuator 4. This is necessary to ensure stable operation of the amplifier 17 with the low-inductance cable 1 of the device.
  • the attenuator 4 consists of a parallel connection of two R / C series members 19, 19 ', which are each connected in parallel to the contacting elements 18, 18'.
  • the resistors R1 and R2 have a resistance which is approximately between 3 and 8 ohms.
  • the inductance of the capacitors C1 and C2 is greater than 0.1 ⁇ F.
  • the attenuator 4 has the task of ohmic load the cable 1 at high frequencies in the order of 1-5 MHz and thus to prevent series resonance due to the inductive effect of the amplifier due to the cable capacitance.
  • the amplifier-side connection housing 5 contains the tuning element 3.
  • the tuning element 3 consists of a series inductance lying between the amplifier output and the forward line of the cable 1. This is formed by the series connection of the two coils L1 and L2 from a few turns of wire with an inductance of about 0.1-1 ⁇ H. With a wire bridge 20, which is provided with plug-in elements, the level of the series inductance can be adapted to the amplifier 17. The coils can also be short-circuited.
  • the tuning member 5 also has a series resistance. This is formed by the series connection of the two resistors R3 and R4, which can also be bridged individually with the wire bridge 21. This allows you to change the character of the sound and to adjust the cable for different cable lengths of the left and right channels.
  • the device has only one attenuator on the loudspeaker side.
  • the amplifier-side connection housing only contains the connection device.
  • the cable can also be operated without a tuning link and attenuator.

Abstract

The appts is provided for transmitting signals from an amplifier to a loudspeaker. It has at least one length of cable (11, 11`). The cable includes several outward leads (12, 12`) for outward transmission of electric signals, and several return leads (13, 13`) for return transmission of the signals. The outward leads (12, 12`) are electrically connected to each other at their ends. The return leads (13, 13`) are also electrically connected together at their ends. The outward and return leads (12, 12`, 13, 13`) are enclosed in a common ferrite cladding (2) so as to compensate any stray fields due to the close magnetic coupling of the leads. <IMAGE>

Description

Die Erfindung betrifft eine Vorrichtung zur Signalübertragung von einem Verstärker auf einen Lautsprecher nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a device for signal transmission from an amplifier to a loudspeaker according to the preamble of patent claim 1.

Ein Lautsprecherkabel soll das vom Verstärker gelieferte Signal in allen Frequenzbereichen unverfälscht übertragen. Da HiFi-Leistungsverstärker jedoch grundsätzlich Spannungsverstärker mit höherer Strombelastbarkeit sind und einen Ausgangswiderstand haben, der gegen 0 Ohm geht, Lautsprecher aber ein dem Schwingspulenstrom proportionales Schallsignal erzeugen, sind die elektrischen Eigenschaften der Leitungsverbindung von wesentlicher Bedeutung. Die elektrischen Eigenschaften eines Lautsprecherkabels lassen sich durch den Widerstandsbelag, den Ableitungsbelag, den Induktivitätsbelag und den Kapazitätsbelag beschreiben. Der ohmsche Widerstand des Kabels wird durch die Leitfähigkeit des Leitermaterials sowie dessen geometrische Abmessungen bestimmt. Die Ableitung ist auf die dielektrischen Verluste zurückzuführen, während der induktive Widerstand des Kabels eine Folge des sich durch den elektrischen Stromfluß aufbauenden Magnetfelds ist. Der induktive Widerstand nimmmt mit steigender Frequenz zu und führt zu einer Phasenverschiebung zwischen Strom und Spannung.A loudspeaker cable is intended to transmit the signal delivered by the amplifier in all frequency ranges in an unadulterated manner. However, since hi-fi power amplifiers are fundamentally voltage amplifiers with a higher current carrying capacity and have an output resistance that goes towards 0 ohms, but loudspeakers generate a sound signal that is proportional to the voice coil current, the electrical properties of the line connection are essential. The electrical properties of a speaker cable can be determined by the Describe the resistance covering, the dissipation covering, the inductance covering and the capacitance covering. The ohmic resistance of the cable is determined by the conductivity of the conductor material and its geometric dimensions. The derivation is due to the dielectric losses, while the inductive resistance of the cable is a consequence of the magnetic field that is built up by the electrical current flow. The inductive resistance increases with increasing frequency and leads to a phase shift between current and voltage.

Aufgrund der Höreigenschaften des menschlichen Ohrs sind Phasenfehler bei der Übertragung eines Signalspektrums besonders kritisch. Phasenfehler verursachen ein Verschwimmen der Ortbarkeit sowohl in der Breite als auch in der Tiefe des Raums. Denn das Ohr orientiert sich nicht nur an den Intensitätsunterschieden, sondern auch an der Phasenbeziehung zwischen den Grund- und Obertönen. Insofern werden an das Übertragungsverhalten von Lautsprecherkabeln hohe Anforderungen gestellt.Due to the hearing characteristics of the human ear, phase errors in the transmission of a signal spectrum are particularly critical. Phase errors cause the location to blur both in width and depth of the room. Because the ear is not only based on the differences in intensity, but also on the phase relationship between the fundamental and overtones. In this respect, high demands are placed on the transmission behavior of loudspeaker cables.

Der Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung zur Signalübertragung von einem Verstärker auf einen Lautsprecher zu schaffen, mit der sich die Signale nahezu unverfälscht übertragen lassen.The invention has for its object to provide a device for signal transmission from an amplifier to a speaker, with which the signals can be transmitted almost unadulterated.

Die Lösung der Aufgabe erfolgt erfindungsgemäß mit den Merkmalen des Patentanspruchs 1.The object is achieved according to the invention with the features of patent claim 1.

Die erfindungsgemäße Vorrichtung weist in ihrer einfachsten Ausführungsform einen Hinleiter für die Hinleitung der elektrischen Signale und einen Rückleiter für die Rückleitung der elektrischen Signale auf, die einen Kabelstrang bilden. Hin- und Rückleiter werden bei der erfindungsgemäßen Vorrichtung von einer gemeinsamen Ferrit-Ummantelung umschlossen, so daß sich die Streufeldreste aufgrund der hohen magnetischen Kopplung der Leiter kompensieren. Es hat sich in Hörversuchen gezeigt, daß die Übertragungseigenschaften der Vorrichtung durch die magnetische Kopplung hörbar verbessert werden. Dies äußert sich in einer verbesserten Ortbarkeit und einem wärmeren Klangbild.In its simplest embodiment, the device according to the invention has an outgoing conductor for the forwarding of the electrical signals and a return conductor for the return of the electrical signals that form a cable harness. In the device according to the invention, the forward and return conductors are enclosed by a common ferrite sheathing, so that the residual stray fields are compensated for by the high magnetic coupling of the conductors. It has been shown in listening tests that the transmission properties of the device are audibly improved by the magnetic coupling. This manifests itself in improved location and a warmer sound.

Zur Verringerung des Induktivitätsbelags besteht das Kabel vorteilhafterweise aus mehreren Strängen, die parallel geschaltet sind. Vorzugsweise besteht jeder Kabelstrang wiederum aus mehreren Hin- und Rückleitern, die an ihren Enden elektrisch miteinander verbunden sind. Die einzelnen Hin- und Rückleiter sollten dicht nebeneinander angeordnet sein. Eine zusätzliche Verseilung oder Verdrillung der Leiter führt zu einer weiteren Induktivitätsverringerung. Besonders vorteilhaft verhält sich hier lackisolierter Kupferdraht (Hochfrequenz-Litze).To reduce the inductance, the cable advantageously consists of several strands that are connected in parallel. Each cable harness in turn preferably consists of a plurality of forward and return conductors which are electrically connected to one another at their ends. The individual forward and return conductors should be arranged close to each other. Additional stranding or twisting of the conductors leads to a further reduction in inductance. Enamel-insulated copper wire (high-frequency stranded wire) is particularly advantageous here.

Damit das Kabel seine Flexibilität weitgehend beibehält, besteht die Ummantelung vorteilhafterweise aus einer Kette von Ferritkernen, die auf dem Kabelstrang bzw. auf den Kabelsträngen aufgereiht sind. Sofern das Kabel nur einen Kabelstrang aufweist, können Rohrkerne als Ummantelung Verwendung finden. Bei einer bevorzugten Ausführungsform mit zwei Kabelsträngen werden die Stränge durch die beiden Öffnungen von Ferrit-Doppellochkernen geführt.So that the cable largely retains its flexibility, the sheathing advantageously consists of a chain of ferrite cores which are lined up on the cable harness or on the cable harnesses. If the cable has only one cable harness, pipe cores can be used as sheathing. In a preferred embodiment with two cable strands, the strands are guided through the two openings by ferrite double-hole cores.

In der Praxis hat sich gezeigt, daß ein Kabel mit einem niedrigen Induktivitätsbelag und einem durch den Kabelaufbau bedingten hohen Kapazitätsbelag zu einer Instabilität des Verstärkers führen kann. Wenn nämlich ein Kabel mit einer relativ großen Kapazität an einen Verstärker angeschlossen wird, ändert sich das Gegenkopplungsverhalten des Verstärkers (Phasenreserve). Die Gegenkopplung wird zur Rückkopplung, so daß der Verstärker zu schwingen beginnt. Die Schwingfrequenz bestimmt sich aus der Kabelkapazität und der Restinduktivität des Kabels sowie dem induktiven Beiwert des Verstärkers als Serienresonanz des hieraus gebildeten Schwingkreises (Q > 1). Die hochfrequenten Schwingungen sind meist ungedämpft, verursachen starke Verzerrungen und können sogar zur Zerstörung des Verstärkers führen.In practice it has been shown that a cable with a low inductance coating and a high capacitance coating due to the cable structure can lead to instability of the amplifier. If a cable with a relatively large capacity is connected to an amplifier, the negative feedback behavior of the amplifier changes (phase reserve). The negative feedback becomes feedback, so that the amplifier starts to oscillate. The oscillation frequency is determined from the cable capacitance and the residual inductance of the cable as well as the inductive coefficient of the amplifier as the series resonance of the oscillating circuit formed from this (Q> 1). The high-frequency vibrations are mostly undamped, cause severe distortion and can even destroy the amplifier.

Um einen stabilen Betrieb des Verstärkers zu gewährleisten, weist die erfindungsgemäße Vorrichtung vorzugsweise ein die Schwingungsneigung des Verstärkers unterdrückendes Dämpfungsglied auf, das an dem lautsprecherseitigen Ende des Kabels vorgesehen ist. Das Dämpfungsglied belastet den Serienschwingkreis ohmisch mit zunehmender Frequenz, so daß der Gütewert stark abgesenkt wird (Q << 1) und Selbsterregung nicht mehr angeregt werden kann. Mit dem Dämpfungsglied am lastseitigen Kabelende läßt sich ein Kabel einsetzen, das einen niedrigen Induktivitätsbelag und einen hohen Kapazitätsbelag aufweist, ohne daß der Verstärker unter bestimmmten Betriebsbedingungen instabil werden könnte. Daher sind auch große Kabellängen, die zu einer besonders hohen Kapazität führen, bei der erfindungsgemäßen Vorrichtung unbedenklich.In order to ensure stable operation of the amplifier, the device according to the invention preferably has an attenuator which suppresses the tendency to oscillate of the amplifier and is provided at the loudspeaker end of the cable. The attenuator ohmic loads the series resonant circuit with increasing frequency, so that the quality value is greatly reduced (Q << 1) and self-excitation can no longer be excited. With the attenuator at the load-side cable end, a cable can be used which has a low inductance and a high capacitance without the amplifier becoming unstable under certain operating conditions. Therefore, long cable lengths, which lead to a particularly high capacity, are harmless in the device according to the invention.

Das Dämpfungsglied ist vorzugsweise ein R/C-Serienglied. Es sollte so dimensioniert sein, daß es für den kritischen Frequenzbereich von 1-5 MHz, in dem der Verstärker infolge der Phasenverschiebung ein oszillatorähnliches Verhalten zeigen kann, wie eine niederohmsche Last wirkt und den Serienschwingkreis stärker bedämpft. Zur Erhöhung der Sicherheit werden vorteilhafterweise mehrere parallelgeschaltete R/C-Serienglieder mit unterschiedlichen Eckfrequenzen verwendet.The attenuator is preferably an R / C series link. It should be dimensioned so that it acts as a low-ohmic load for the critical frequency range of 1-5 MHz, in which the amplifier can exhibit an oscillator-like behavior as a result of the phase shift, and dampens the series resonant circuit more strongly. To increase security, several R / C series links with different corner frequencies are advantageously used in parallel.

In einer weiteren Ausführungsform weist die Vorrichtung zur Signalübertragung von einem Verstärker auf einen Lautsprecher am verstärkerseitigen oder lautsprecherseitigen Kabelende ein Abstimmglied auf, das aus einer Serieninduktivität (L) und/oder einem Serienwiderstand (R) besteht. Durch Veränderung der Widerstands- und Induktivitätswerte kann die Vorrichtung an den Verstärker bzw. den Lautsprecher angepaßt werden. Hierdurch können die Übertragungseigenschaften des Kabels durch Veränderung der Stromanstiegszeitkonstanten τ=L/R

Figure imgb0001
nochmals verbessert werden.In a further embodiment, the device for signal transmission from an amplifier to a loudspeaker on the amplifier-side or loudspeaker-side cable end has a tuning element, which consists of a series inductance (L) and / or a series resistance (R). The device can be adapted to the amplifier or the loudspeaker by changing the resistance and inductance values. This can change the transmission properties of the cable by changing the current rise time constant τ = L / R
Figure imgb0001
be improved again.

Im folgenden wird unter Bezugnahme auf die Zeichnungen ein Ausführungsbeispiel der Erfindung näher erläutert.In the following an embodiment of the invention will be explained with reference to the drawings.

Es zeigen:

Fig. 1
die aus einem Kabel sowie einem Abstimmglied am verstärkerseitigen Kabelende und einem Dämpfungsglied am lautsprecherseitigen Kabelende bestehende Vorrichtung zur Signalübertragung von einem Verstärker auf einen Lautsprecher,
Fig. 2
die auf das Kabel aufgereihten Doppellochkerne der Vorrichtung zur Signalübertragung von einem Verstärker auf einen Lautsprecher,
Fig. 3
einen Schnitt entlang der Linie III-III von Fig. 2,
Fig. 4
den Aufbau des aus zwei parallelgeschalteten Kabelsträngen bestehenden Kabels, und
Fig. 5
das Blockschaltbild der Vorrichtung zur Signalübertragung von einem Verstärker auf einen Lautsprecher.
Show it:
Fig. 1
the device for signal transmission from an amplifier to a loudspeaker, consisting of a cable and a tuning element on the amplifier-side cable end and an attenuator on the loudspeaker-side cable end,
Fig. 2
the double-hole cores of the device for signal transmission from an amplifier to a loudspeaker, lined up on the cable,
Fig. 3
2 shows a section along the line III-III of FIG. 2,
Fig. 4
the structure of the cable consisting of two parallel wiring harnesses, and
Fig. 5
the block diagram of the device for signal transmission from an amplifier to a speaker.

Die Vorrichtung zur Signalübertragung von einem Verstärker auf einen Lautsprecher besteht aus einem Kabel 1 mit einer Ummantelung 2 aus magnetisch leitendem Material sowie einem Abstimmmglied 3 am verstärkerseitigen Ende des Kabels und einem Dämpfungsglied 4 am lautsprecherseitigen Kabelende. Fig. 1 zeigt das Kabel 1 mit den Anschlußgehäusen 5,6 , die das Abstimmglied 3 und das Dämpfungsglied 4 aufnehmen. Aus den Anschlußgehäusen 5,6 ragen kurze Anschlußkabel 7,8 mit passenden Steckern 9,10 zum Anschluß des Verstärkers bzw. des Lautsprechers.The device for signal transmission from an amplifier to a loudspeaker consists of a cable 1 with a sheath 2 made of magnetically conductive material and a tuning element 3 at the amplifier end of the cable and an attenuator 4 at the loudspeaker end of the cable. Fig. 1 shows the cable 1 with the connection housings 5,6, which accommodate the tuning member 3 and the attenuator 4. Short connection cables 7,8 with suitable plugs 9, 10 protrude from the connection housings 5, 6 for connecting the amplifier or the loudspeaker.

Der Aufbau der Vorrichtung wird nachfolgend unter Bezugnahme auf die Fign. 2 bis 4 beschrieben. Das Kabel 1 weist zwei Kabelstränge 11,11' auf, die jeweils aus drei Hinleitern 12,12' für die Hinleitung der elektrischen Signale und drei Rückleitern 13,13' für die Rückleitung der elektrischen Signale bestehen. Die Hinleiter 12,12' und die Rückleiter 13,13' jedes Kabelstrangs 11,11' sind jeweils paarweise angeordnet und in einer gemeinsamen Schlagrichtung um einen Textilfaden gewickelt. An ihren Enden sind die Hinleiter 12,12' der beiden Kabelstränge 11,11' miteinander elektrisch verbunden und die Rückleiter 13,13' der beiden Kabelstränge 11,11' sind an ihren Enden elektrisch miteinander verbunden.The construction of the device is described below with reference to FIGS. 2 to 4 described. The cable 1 has two cable strands 11, 11 ', each consisting of three outgoing lines 12, 12' for the forwarding of the electrical signals and three return lines 13, 13 'for the return line of the electrical signals. The forward conductors 12, 12 'and the return conductors 13, 13' of each cable harness 11, 11 'are each arranged in pairs and wound around a textile thread in a common lay direction. The forward conductors 12, 12 'of the two cable strands 11, 11' are electrically connected to one another at their ends, and the return conductors 13, 13 'of the two cable strands 11, 11' are electrically connected to one another at their ends.

Die Hin- und Rückleiter 12,12',13,13' sind Litzen aus jeweils neunzig verdrillten lackisolierten Kupferdrähten. Da die Leiter aus einer Vielzahl von Einzelleitern bestehen, wird die Oberfläche der Leiter vergrößert, wodurch sich der Skineffekt verringert. Gleichzeitig kompensieren sich die von jeder Einzelleitung entstehenden Magnetfelder und reduzieren hierdurch die Induktivität.The forward and return conductors 12, 12 ', 13, 13' are strands of ninety twisted enamelled copper wires. Since the conductors consist of a large number of individual conductors, the surface of the conductors is enlarged, which reduces the skin effect. At the same time, the magnetic fields arising from each individual line compensate each other and thereby reduce the inductance.

Die verseilten Hin- und Rückleiter 12,12',13,13' der beiden Kabelstränge 11,11' sind durch die beiden Öffnungen 15,15' von Doppelloch-Ferritkernen 16 geführt.The stranded forward and return conductors 12, 12 ', 13, 13' of the two cable strands 11, 11 'are guided through the two openings 15, 15' of double-hole ferrite cores 16.

Fig. 3 zeigt einen Schnitt durch die Doppelloch-Ferritkerne 16, die auf den beiden Kabelsträngen 11,11' aufgereiht sind und die Ummantelung 2 aus magnetisch leitendem Material bilden. Die Ferrit-Kerne 16 weisen ein im wesentlichen rechteckförmiges Profil auf und sind mit zwei parallelen Ausnehmungen 15,15' versehen, die die Kabelstränge mit den Hin- und Rückleitern aufnehmen.Fig. 3 shows a section through the double-hole ferrite cores 16, which are lined up on the two cable strands 11, 11 'and form the sheath 2 made of magnetically conductive material. The ferrite cores 16 have an essentially rectangular profile and are provided with two parallel recesses 15, 15 'which receive the cable strands with the outgoing and return conductors.

Da die Hin- und Rückleiter 12,12',13,13' des Kabels 1 dicht nebeneinander liegen, kompensieren sich die gegenphasigen Magnetfelder von Hin- und Rückleiter.Since the forward and return conductors 12, 12 ', 13, 13' of the cable 1 lie close together, the out-of-phase magnetic fields of the forward and return conductors are compensated for.

Daraus ergibt sich ein relativ niedriger Induktivitätsbelag. Dieser liegt zwischen 0,02 und 0,2 µH/m. Der Kapazitätsbelag des Kabels 1 ist hingegen relativ hoch. Dieser liegt zwischen 1 und 5 nF/m.This results in a relatively low inductance. This is between 0.02 and 0.2 µH / m. The capacity of the cable 1, however, is relatively high. This is between 1 and 5 nF / m.

Fig. 5 zeigt das Blockschaltbild der Vorrichtung zur Signalübertragung von einem Verstärker 17 auf einen Lautsprecher 22. Die Kontaktierung der Hin- und Rückleiter 12,12',13,13' erfolgt mit Kontaktierungselementen 18,18' die in den verstärker- und lautsprecherseitigen Anschlußgehäusen 5,6 vorgesehen sind. Die Kabelenden der gemeinsamen Hinleiter 12,12' sind mit den Kontaktierungselementen 18 und die Kabelenden der gemeinsamen Rückleiter 13,13' sind mit den Kontaktierungselementen 18' elektrisch miteinander verbunden.5 shows the block diagram of the device for signal transmission from an amplifier 17 to a loudspeaker 22. The contacting of the forward and return conductors 12, 12 ', 13, 13' takes place with contacting elements 18, 18 'in the amplifier and loudspeaker-side connection housings 5.6 are provided. The cable ends of the common forward conductors 12, 12 'are electrically connected to the contacting elements 18 and the cable ends of the common return conductors 13, 13' are electrically connected to the contacting elements 18 '.

Das lautsprecherseitige Anschlußgehäuse 6 enthält ferner das Dämpfungsglied 4. Dieses ist erforderlich um einen stabilen Betrieb des Verstärkers 17 mit dem niederinduktiven Kabel 1 der Vorrichtung zu gewährleisten. Das Dämpfungsglied 4 besteht aus einer Parallelschaltung von zwei R/C-Seriengliedern 19,19', die jeweils parallel zu den Kontaktierungselementen 18,18' geschaltet sind. Die Widerstände R₁ und R₂ haben einen Widerstand, der etwa zwischen 3 und 8 Ohm liegt. Die Induktivität der Kondensatoren C₁ und C₂ ist größer als 0,1 µF. Das Dämpfungsglied 4 hat die Aufgabe, das Kabel 1 bei hohen Frequenzen in der Größenordnung von 1-5 MHz ohmisch zu belasten und damit Serienresonanz aufgrund der induktiven Wirkung des Verstärkers durch die Kabelkapazität zu verhindern.The speaker-side connection housing 6 also contains the attenuator 4. This is necessary to ensure stable operation of the amplifier 17 with the low-inductance cable 1 of the device. The attenuator 4 consists of a parallel connection of two R / C series members 19, 19 ', which are each connected in parallel to the contacting elements 18, 18'. The resistors R₁ and R₂ have a resistance which is approximately between 3 and 8 ohms. The inductance of the capacitors C₁ and C₂ is greater than 0.1 µF. The attenuator 4 has the task of ohmic load the cable 1 at high frequencies in the order of 1-5 MHz and thus to prevent series resonance due to the inductive effect of the amplifier due to the cable capacitance.

Das verstärkerseitige Anschlußgehäuse 5 enhält das Abstimmglied 3. Das Abstimmglied 3 besteht aus einer zwischen dem Verstärkerausgang und der Hinleitung des Kabels 1 liegenden Serieninduktivität. Diese wird durch die Reihenschaltung der beiden Spulen L₁ und L₂ aus wenigen Drahtwindungen mit einer Induktivität von etwa 0,1-1 µH gebildet. Mit einer Drahtbrücke 20, die mit Steckelementen versehen ist, kann die Höhe der Serieninduktivität an den Verstärker 17 angepaßt werden. Die Spulen können aber auch kurzgeschlossen werden. Das Abstimmglied 5 weist ferner einen Serienwiderstand auf. Dieser wird durch die Reihenschaltung der beiden Widerstände R₃ und R₄ gebildet, die sich mit der Drahtbrücke 21 ebenfalls einzeln überbrücken lassen. Hiermit läßt sich der Klangcharakter verändern und bei unterschiedlichen Kabellängen des linken und rechten Kanals eine Kabelanpassung vornehmen. Beide Effekte beruhen auf der Tatsache, daß in einem stromtransportierenden Leiter die Stromanstiegsgeschwindigkeit durch τ=L/R

Figure imgb0002
definiert ist. Die variablen L- und R-Werte in dem verstärkerseitigen oder auch lautsprecherseitigen Abstimmglied 3 erlauben es, die Stromanstiegszeitkonstante τ gezielt zu verkürzen bzw. zu verlängern.The amplifier-side connection housing 5 contains the tuning element 3. The tuning element 3 consists of a series inductance lying between the amplifier output and the forward line of the cable 1. This is formed by the series connection of the two coils L₁ and L₂ from a few turns of wire with an inductance of about 0.1-1 µH. With a wire bridge 20, which is provided with plug-in elements, the level of the series inductance can be adapted to the amplifier 17. The coils can also be short-circuited. The tuning member 5 also has a series resistance. This is formed by the series connection of the two resistors R₃ and R₄, which can also be bridged individually with the wire bridge 21. This allows you to change the character of the sound and to adjust the cable for different cable lengths of the left and right channels. Both effects are based on the fact that in a current-transporting conductor the rate of current rise increases τ = L / R
Figure imgb0002
is defined. The variable L and R values in the amplifier-side or loudspeaker-side tuning element 3 allow the current rise time constant τ to be shortened or lengthened in a targeted manner.

In einer vereinfachten Ausführungsform weist die Vorrichtung nur ein lautsprecherseitiges Dämpfungsglied auf. Das verstärkerseitige Anschlußgehäuse enthält lediglich die Anschlußvorrichtung. Das Kabel kann bei geringeren Längen aber auch ohne Abstimmglied und Dämpfungsglied betrieben werden.In a simplified embodiment, the device has only one attenuator on the loudspeaker side. The amplifier-side connection housing only contains the connection device. In the case of shorter lengths, the cable can also be operated without a tuning link and attenuator.

Es hat sich in Hörversuchen gezeigt, daß das Übertragungsverhalten durch die Ferrit-Ummantelung hörbar verbessert wird. Das verbesserte Übertragungsverhalten äußerst sich durch eine bessere Auflösung des Klangbilds und einen wärmeren Klangcharakter.It has been shown in listening tests that the transmission behavior can be heard through the ferrite sheathing is improved. The improved transmission behavior is expressed by a better resolution of the sound image and a warmer sound character.

Claims (9)

Vorrichtung zur Signalübertragung von einem Verstärker auf einen Lautsprecher, mit mindestens einem Kabelstrang (11,11') bestehend aus
mehreren Hinleitern (12,12') für die Hinleitung der elektrischen Signale und mehreren Rückleitern (13,13') für die Rückleitung der elektrischen Signale, wobei die Hinleiter (12,12') an ihren Enden elektrisch miteinander verbunden sind und die Rückleiter (13,13') an ihren Enden elektrisch miteinander verbunden sind,
dadurch gekennzeichnet,
daß die Hinleiter (12,12') und die Rückleiter (13,13') von einer gemeinsamen Ferrit-Ummantelung (2) umschlossen sind.
Device for signal transmission from an amplifier to a loudspeaker, comprising at least one cable harness (11, 11 ')
a plurality of outgoing conductors (12, 12 ') for the forwarding of the electrical signals and a plurality of return conductors (13, 13') for the returning of the electrical signals, the forward conductors (12, 12 ') being electrically connected to one another at their ends and the return conductors ( 13, 13 ') are electrically connected to one another at their ends,
characterized by
that the outgoing conductors (12, 12 ') and the return conductors (13, 13') are enclosed by a common ferrite sheathing (2).
Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Ummantelung (2) aus einer Kette von Ferritkernen (16) besteht, die auf dem Kabelstrang (11) bzw. den Kabelsträngen (11,11') aufgereiht sind.Device according to claim 1, characterized in that the sheathing (2) consists of a chain of ferrite cores (16) which are lined up on the cable harness (11) or the cable harnesses (11, 11 '). Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß zwei an ihren Enden parallelgeschaltete Kabelstränge (11,11') vorgesehen sind, und daß die Kerne Doppellochkerne (16) sind.Device according to claim 2, characterized in that two cable strands (11, 11 ') connected in parallel at their ends are provided, and in that the cores are double-hole cores (16). Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Hinleiter (12,12') und Rückleiter (13,13') jedes Kabelstrangs (11,11') miteinander verseilt sind.Device according to one of claims 1 to 3, characterized in that the outgoing conductors (12, 12 ') and return conductors (13, 13 ') of each cable harness (11, 11') are stranded together. Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß jeder Leiter (12,12',13,13') aus einer Vielzahl von isolierten Einzeldrähten besteht.Device according to one of claims 1 to 4, characterized in that each conductor (12, 12 ', 13, 13') consists of a plurality of insulated individual wires. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, daß die Einzeldrähte lackisolierte Kupferdrähte sind.Apparatus according to claim 5, characterized in that the individual wires are enamelled copper wires. Vorrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß an dem lautsprecherseitigen Kabelende ein die Schwingungsneigung des Verstärkers unterdrückendes Dämpfungsglied (4) vorgesehen ist.Device according to one of claims 1 to 6, characterized in that an attenuator (4) which suppresses the tendency of the amplifier to oscillate is provided on the loudspeaker-side cable end. Vorrichtung nach Anspruch 7, dadurch gekennzeichnet, daß das Dämpfungsglied (4) ein R/C-Serienglied (19) oder eine Parallelschaltung aus mehreren R/C-Seriengliedern (19,19') ist.Device according to claim 7, characterized in that the damping element (4) is an R / C series element (19) or a parallel connection of several R / C series elements (19, 19 '). Vorrichtung nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß an dem verstärkerseitigen oder lautsprecherseitigen Kabelende ein Abstimmglied (3) vorgesehen ist, das eine Serieninduktivität (L) und/oder einen Serienwiderstand (R) aufweist.Device according to one of claims 1 to 8, characterized in that a tuning element (3) is provided on the amplifier-side or loudspeaker-side cable end, which has a series inductance (L) and / or a series resistance (R).
EP95105163A 1994-04-15 1995-04-06 Appliance for signal transmission from an amplifier to a loudspeaker Expired - Lifetime EP0677978B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4412749 1994-04-15
DE4412749A DE4412749A1 (en) 1994-04-15 1994-04-15 Device for transmitting signals from an amplifier to a loudspeaker

Publications (3)

Publication Number Publication Date
EP0677978A2 true EP0677978A2 (en) 1995-10-18
EP0677978A3 EP0677978A3 (en) 1996-02-07
EP0677978B1 EP0677978B1 (en) 2000-07-26

Family

ID=6515308

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95105163A Expired - Lifetime EP0677978B1 (en) 1994-04-15 1995-04-06 Appliance for signal transmission from an amplifier to a loudspeaker

Country Status (3)

Country Link
EP (1) EP0677978B1 (en)
AT (1) ATE195051T1 (en)
DE (2) DE4412749A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19600308A1 (en) * 1996-01-05 1997-07-10 Siemens Matsushita Components Inductive component for damping common-mode and push-pull interference
DE20204259U1 (en) * 2002-03-16 2002-07-04 Seiffert Joerg Circuit for acoustic group delay and thus the frequency-dependent phase behavior of the loudspeaker chassis and loudspeakers
DE102005062714B4 (en) 2005-12-28 2021-12-09 Aqipa GmbH Cable with two conductor systems for power applications
WO2008041708A1 (en) 2006-10-02 2008-04-10 Oki Electric Cable Co., Ltd. Motor drive cable with high frequency leak current return wire, nonshield cable with low inductance return wire, and motor drive control system using that cable
DE102009046201A1 (en) 2009-10-30 2011-05-05 Robert Bosch Gmbh Attenuator for suppression of common mode current and for use in electrical motor vehicle for absorption of current at e.g. sensor, has structure formed at surface of electrical conductor, and designed as electromagnetic resonator
DE102015112722B4 (en) * 2015-08-03 2021-07-08 Lisa Dräxlmaier GmbH Device and method for producing a cable harness

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1523720A (en) * 1975-12-02 1978-09-06 Secr Defence Suppression of induced currents in cables
EP0237500A2 (en) * 1986-03-10 1987-09-16 CAVIS CAVETTI ISOLATI S.p.A. A screened electrical cable
US4754102A (en) * 1987-06-02 1988-06-28 Dzurak Thomas J Directional interconnection cable for high fidelity signal transmission
US5122924A (en) * 1988-12-05 1992-06-16 Murata Manufacturing Co., Ltd. Electronic component having a plurality of current path pairs
EP0649268A1 (en) * 1993-10-13 1995-04-19 Hans M. Strassner Appliance for the signal transmission from an amplifier to a loudspeaker

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1159527C2 (en) * 1958-03-28 1974-05-30 Gustav Guanella Dipl Ing Device for suppressing currents flowing in the same direction in a double-conductor arrangement
JPS5530131A (en) * 1978-08-25 1980-03-03 Shin Endou Speaker cord
DE3123040A1 (en) * 1981-06-11 1983-01-05 Vacuumschmelze Gmbh, 6450 Hanau Magnetically screened cable having a screen consisting of soft-magnetic material
JPH0543510Y2 (en) * 1988-09-29 1993-11-02

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1523720A (en) * 1975-12-02 1978-09-06 Secr Defence Suppression of induced currents in cables
EP0237500A2 (en) * 1986-03-10 1987-09-16 CAVIS CAVETTI ISOLATI S.p.A. A screened electrical cable
US4754102A (en) * 1987-06-02 1988-06-28 Dzurak Thomas J Directional interconnection cable for high fidelity signal transmission
US5122924A (en) * 1988-12-05 1992-06-16 Murata Manufacturing Co., Ltd. Electronic component having a plurality of current path pairs
EP0649268A1 (en) * 1993-10-13 1995-04-19 Hans M. Strassner Appliance for the signal transmission from an amplifier to a loudspeaker

Also Published As

Publication number Publication date
EP0677978A3 (en) 1996-02-07
ATE195051T1 (en) 2000-08-15
DE59508595D1 (en) 2000-08-31
DE4412749A1 (en) 1995-10-26
EP0677978B1 (en) 2000-07-26

Similar Documents

Publication Publication Date Title
DE69915816T2 (en) Current measuring device
DE3638748C2 (en)
DE69530864T2 (en) Coupling device for connecting a symmetrical signal line to an asymmetrical signal line
DE3017911C2 (en) Suppressor plug
DE2127193C3 (en) Coupling unit for coupling twin cores running insulated in the phase cable of high-voltage lines as carrier frequency lines to communication devices or cables
DE2905821A1 (en) ANTENNA INSULATION DEVICE
EP0677978B1 (en) Appliance for signal transmission from an amplifier to a loudspeaker
EP0649268B1 (en) Appliance for the signal transmission from an amplifier to a loudspeaker
DE1566967A1 (en) Antenna arrangement
DE2744862C2 (en) High-frequency transformer formed from pieces of coaxial line
EP0103880B1 (en) Remote powering coupler for a line terminal arrangement in an analogous or digital information transmission system
DE1943890A1 (en) Antenna amplifier
DE60102202T2 (en) A switchable antenna for a transceiver
DE4120773C2 (en)
DE973564C (en) Artificial high frequency line
DE2311861A1 (en) ANTENNA IN THE FORM OF A LOOP
DE102014013557B3 (en) Electrical assembly with a Villard cascade
EP3252490A1 (en) Device and method for transporting radiofrequency-signals through a shielded, balanced line
DE512026C (en) Duplex system for communication by means of high-frequency currents along lines
DE671050C (en) High frequency transmission system
DE4336226C2 (en) Line transformer
DE2448737B1 (en) Broadband signal direction dependent transmitter - has windings through double axial hole in ferromagnetic core
DE69912318T2 (en) Remote Feeder Reactance Coil
DE4302929C1 (en) Wide band repeater coil with two coaxial windings - connected in series with same winding sense to connection point forming induction coil output
DE1286128B (en) Circuit arrangement for suppressing interference voltages when transmitting signals via coaxial cables

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

Kind code of ref document: A2

Designated state(s): AT CH DE FR GB IT LI

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT CH DE FR GB IT LI

17P Request for examination filed

Effective date: 19960613

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

17Q First examination report despatched

Effective date: 19990929

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT CH DE FR GB IT LI

REF Corresponds to:

Ref document number: 195051

Country of ref document: AT

Date of ref document: 20000815

Kind code of ref document: T

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REF Corresponds to:

Ref document number: 59508595

Country of ref document: DE

Date of ref document: 20000831

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 20001002

ITF It: translation for a ep patent filed

Owner name: SOCIETA' ITALIANA BREVETTI S.P.A.

ET Fr: translation filed
REG Reference to a national code

Ref country code: CH

Ref legal event code: NV

Representative=s name: DIPL.-ING. ETH H. R. WERFFELI PATENTANWALT

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 20070423

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 20070424

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20070623

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20070425

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20070626

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20070418

Year of fee payment: 13

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20080406

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20080430

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20081101

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20080430

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20081231

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20080406

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20080430

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20080406

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20080406