EP0015186B1 - Dreikanaliges akustisches System - Google Patents

Dreikanaliges akustisches System Download PDF

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Publication number
EP0015186B1
EP0015186B1 EP80400180A EP80400180A EP0015186B1 EP 0015186 B1 EP0015186 B1 EP 0015186B1 EP 80400180 A EP80400180 A EP 80400180A EP 80400180 A EP80400180 A EP 80400180A EP 0015186 B1 EP0015186 B1 EP 0015186B1
Authority
EP
European Patent Office
Prior art keywords
speaker
enclosures
channel
opening
cavity
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP80400180A
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English (en)
French (fr)
Other versions
EP0015186A1 (de
Inventor
Michel Maille
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.)
D'electronique Industrielle De Moulins S Ste
Original Assignee
SELIMO ELECT IND MOULINS
D'ELECTRONIQUE INDUSTRIELLE de MOULINS - SELIMO Ste
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Publication of EP0015186A1 publication Critical patent/EP0015186A1/de
Application granted granted Critical
Publication of EP0015186B1 publication Critical patent/EP0015186B1/de
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
    • H04R1/2807—Enclosures comprising vibrating or resonating arrangements
    • H04R1/2838—Enclosures comprising vibrating or resonating arrangements of the bandpass type
    • H04R1/2842—Enclosures comprising vibrating or resonating arrangements of the bandpass type for loudspeaker transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R5/00—Stereophonic arrangements
    • H04R5/02—Spatial or constructional arrangements of loudspeakers

Definitions

  • the present invention relates to a triphonic acoustic reproduction system according to the preamble of the claims.
  • the present invention includes low frequency loudspeakers and more particularly low frequency loudspeakers for triphonic systems.
  • each channel comprises at the output a loudspeaker or an acoustic enclosure capable of reproducing the whole band of audible frequencies
  • each channel comprises at the output a loudspeaker, or an acoustic enclosure, capable of rendering the medium and high frequencies, that is to say the mid and high sounds, the low sounds being reproduced by a loudspeaker, or an acoustic speaker, common to the two channels.
  • the electrical signal from the output of each of the two amplifier channels is injected into an electronic filter which separates the low frequency component from the rest of the signal.
  • the two low frequency signals thus obtained are then injected into an electronic mixer, at the output of which the low frequency speaker is connected.
  • the present invention overcomes these drawbacks by developing a triphonic acoustic reproduction system which comprises a low frequency box usable at the output of an amplifier without the aid of any filter.
  • the frequency response of the box according to the invention can be adapted as a function of its position in the listening room and it is possible to very easily adjust the level of the low frequencies.
  • the triphonic acoustic reproduction system is characterized in that the device for restoring low-frequency signals consists of an acoustic box with two speakers each supporting at least one speaker so that the rear face of each top -speaker radiates inside its enclosure, the front face of each speaker radiating inside a cavity linked to the two speakers, the interior space of this cavity communicating with the outside by an opening of dimensions predetermined, this cavity and this opening being such that the high cut-off frequency of the box depends on the volume of the cavity and that the sound efficiency of the box is a function of the surface of said opening, a loudspeaker of this box being directly connected by output of the amplifier's guache channel and the other speaker being directly connected to the output of the right channel.
  • the two speakers are placed symmetrically face to face, the front face of the speakers then radiating into the cavity formed by the extension of the partitions of the two speakers, perpendicular to the speaker support faces ( s) and so as to leave an opening of predetermined width.
  • the triphonic system shown in FIG. 1 includes a stereophonic source 1 such as a record player or even a tape recorder. This source is connected to the inputs of a stereo 2 high fidelity amplifier.
  • the two channels, left 2G and right 2D of amplifier 2 have various preamplification, tone correction and power amplification circuits.
  • the left channel 2G therefore amplifies the signal from the left output SG of source 1 and the right channel 2D the signal from the right output SD.
  • the signal amplified by the 2D straight channel is then injected at the input of a 3D electronic filter.
  • a 3D electronic filter We thus have at the 7D output of this filter the low frequency component, for example frequencies below 200 Hz, of this amplified signal, and at the 8D output of frequencies above for example 200 Hz.
  • the 8D output is connected to a 5D loudspeaker allowing the reproduction of medium and treble sounds.
  • the signal amplified by the left channel 2G is injected at the input of a 3G electronic filter to the 3D filter of the right channel.
  • the 8G output of this filter is also connected to a 5G speaker allowing the reproduction of mid and treble sounds.
  • the two low-frequency outputs 7D and 7G of the two filters are connected to the inputs of a mixer 4, which, from the two low-frequency signals applied to its inputs, supplies the speaker 6 connected to its output with a low- frequency identical to the signals injected at the input and level adapted to this low frequency speaker 6.
  • a stereophonic source 1 conforming to that of FIG. 1, has its outputs, right SD and left SG, connected to the inputs of a high-fidelity amplifier with two 2D and 2G channels.
  • the low-frequency box comprises two identical speakers 10D and 10G, for example parallelepipedic, placed parallel one opposite the other at a predetermined distance.
  • Each of these speakers supports on one of its faces at least one speaker, 11D for the 10D speaker and 11G for the 10G speaker, so that a speaker of a speaker is facing a high - identical speaker from the other speaker.
  • enclosures can be of the closed type.
  • enclosures which avoid the phenomena of acoustic short circuit due to the compensation of the pressure between the front and rear faces of the diaphragm of the loudspeaker for low frequencies, oblige to have enclosures of large dimensions.
  • closed enclosures there appears a phenomenon of resonance at frequencies related to the dimensions of the enclosure. The lower the resonant frequency, the larger the dimensions of the speaker.
  • speakers of the counter-resonance or "bass reflex" type are adopted.
  • an opening, or vent is provided in the enclosure. This then behaves as a Helmholtz resonator. The dimensions of this enclosure are calculated so that the low energy low frequency sounds are amplified and emitted to the outside by the vent. This vent then behaves like a second speaker which only works for very low frequencies.
  • the two speakers are held symmetrically, that is to say the loudspeaker of one facing the loudspeaker of the other, and the vent of one facing the vent of the other.
  • the two closed or counter-resonant enclosures have their walls extended perpendicular to the speaker support faces so as to form a cavity 15.
  • This cavity 15 has an opening of width x, representing the distance between the end of the extension of the partition of enclosure 10D and the end of the extension of the partition of enclosure 10G.
  • the low frequency loudspeaker 11 D of the enclosure 10D is connected at the output of the right channel 2D of the amplifier 2 and the loudspeaker 11G of the enclosure 10G at the output of the left channel 2G.
  • These two speakers receive the amplified signals from source 1. These two signals are different for high frequencies and identical for low frequencies. Indeed, sound recordings, such as discs, are made in stereophony for high and medium frequencies, that is to say above about 200 Hz and can be affected in monophony for lower frequencies, because the ear human is no longer able to clearly locate the place of emission for very serious sounds.
  • the low frequency loudspeakers having only a very limited pass band because of the great inertia of their membrane, only radiate audibly for relatively low frequencies, for example less than 200 Hz.
  • the two speakers facing each other being supplied for low frequencies by identical signals, vibrate in phase and the assembly then operates in a so-called forced air manner.
  • the sounds emitted by the two loudspeakers are mixed in the volume delimited by two loudspeaker support faces, that is to say the volume of the cavity 15, and emitted towards the outside by the opening of width x.
  • the sound efficiency of the acoustic box according to the invention is linked to the dimensions of the opening through which the sound is emitted, that is to say the surface of width x through which the volume of the cavity 15 communicates with the outside. of the box. Any change in the distance between the two speakers, that is to say any change in the width x, causes a change in the emissive surface and therefore a change in the overall sound performance.
  • the two enclosures can be maintained at a variable distance, using a system of shims inserted between these two enclosures, or even using adjustable jacks or any other means capable of performing this function.
  • FIG. 3 represents a block diagram of a triphonic system equipped with a low frequency box according to a second embodiment of the invention.
  • the two speakers 10D and 10G are placed side by side and have a common partition.
  • the 11 G speaker (s) of the 10G speaker are placed in the same plane as the 11 G speaker (s) of the 10G speaker.
  • the front faces of these speakers radiate into a cavity 15 formed by the extension of the non-common partitions of the speakers 10D and 10G and by a wall covering the whole parallel to the speaker support faces.
  • This cavity 15 communicates with the outside through an opening 17, the dimensions of which condition the sound performance of the box.
  • the speaker 11D of the enclosure 10D, as well as a mid-high-range speaker 5D are connected at the output of the 2D channel of an amplifier 2, and the speaker 11G of the enclosure 10G, as well as a 5G mid-treble speaker are connected at the output of the 2G channel.
  • the loudspeakers 11 D and 11 G vibrate in phase, and the sounds emitted by each of them are mixed in the cavity 15, and emitted towards the exterior by the opening 17.
  • low-frequency subwoofers are mainly used in high-fidelity triphonic chains, but can also be used without disadvantage for the reproduction of bass sounds on a monophonic chain, or even a stereophonic chain, a subwoofer according to the invention being connected to each of the two ways.

Claims (8)

1. System zur triphonischen Tonwiedergabe, mit einem zweikanaligen Verstärker (2) für einen linken (2G) und einen rechten Kanal (2D), der an eine Stereoquelle (1) angeschlossen ist, mit einem Lautsprecher (5D, 5G) für jeden Kanal zur Wiedergabe der Mittel- und Hochtöne und mit einer beiden Kanälen gemeinsamen Vorrichtung zur Wiedergabe der niederfrequenten Tonsignale, dadurch gekennzeichnet, daß die Vorrichtung zur Wiedergabe der niederfrequenten Tonsignale aus einer Akustikbox besteht, die zweit Kammern (10D, 10G) enthält, wobei jede der Kammern mindestens einen Lautsprecher. (11 D, 11G) so enthält, daß die Rückseite jedes Lautsprechers in das Kammerinnere strahlt, während die Vorderseite jedes Lautsprechers in einen mit bieden Kammern verbundenen Raum (15) abstrahlt, der mit der Umwelt über eine Öffnung vorgegebener Abmessungen in Verbindung steht, wobei der Raum und die Öffnung so bemessen sind, daß die obere Grenzfrequenz der Box vom Volumen des Raums abhängt und daß der akustische Wirkungsgrad der Box von der Fläche der Öffnung abhängt, und daß der eine Lautsprecher dieser Box direkt mit dem Ausgang des linken Verstärkerkanals und der andere Lautsprecher direkt mit dem Ausgang des rechten Verstärkerkanals verbunden ist.
2. System nach Anspruch 1, dadurch gekennzeichnet, daß sie Mittel aufweist, mit denen die vorgegebenen Abmessungen variiert werden können.
3. System nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die beiden Kammern (10D, 10G) identisch sind und mit einem vorgegebenen Abstand einander gegenüberliegen, so daß der bzw. die Lautsprecher der einen Kammer dem bzw. den Lautsprechern der anderen Kammer gegenüberliegen und daß die Vorderseite jedes dieser Lautsprecher in einen Raum (15) heneinstrahlt, der durch die Verlängerung der Wände der beiden Kammern senkrecht zu den den bzw. die Lautsprecher tragenden Seiten gebildet wird, und daß eine Öffnung einer vorgegebenen Weite (x) verbleibt.
4. System nach den Ansprüchen 2 und 3, dadurch gekennzeichnet, daß die beiden Kammern (10D, 10G) durch einen Satz auswechselbarer Abstandsstücke (12) variabler Dicke auf Abstand gehalten werden, so daß die Weite (x) der Öffnung verändert werden kann.
5. System nach den Ansprüchen 2, und 3, dadurch gekennzeichnet, daß die beiden Kammern (10D, 10G) mithilfe einstellbarer Bolzen einander gegenüber befestigt sind.
6. System nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die beiden Kammern (10D, 10G) identisch sind und Seite an Seite liegen, derart, daß sie eine gemeinsame Wand bilden und daß die Lautsprecher (11D, 11G) in einer gemeinsamen Ebene liegen und daß ihre Vorderseite in den Raum (15) strahlt, der einerseits von der Verlängerung der nicht gemeinsamen Wände der Kammern senkrecht zu den die Lautsprecher tragenden Seiten und andererseits von einer Wand gebildet wird, die parallel zur Ebene dieser die Lautsprecher tragenden Seiten liegt, wobei diese letztere Wand mit einer Öffnung vorgegebener Abmessungen versehen ist.
7. System nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die beiden Kammern (10D, 10G) vom Gegenresonanztyp sind.
8. System nach einem beliebigen der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der bzw. die Lautsprecher jeder Kammer direkt an den entsprechenden Verstärkerausgang angeschlossen ist bzw. sind.
EP80400180A 1979-02-23 1980-02-05 Dreikanaliges akustisches System Expired EP0015186B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7904661A FR2450019A1 (fr) 1979-02-23 1979-02-23 Caisson basse frequence, notamment pour systeme acoustique triphonique
FR7904661 1979-02-23

Publications (2)

Publication Number Publication Date
EP0015186A1 EP0015186A1 (de) 1980-09-03
EP0015186B1 true EP0015186B1 (de) 1985-07-24

Family

ID=9222374

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80400180A Expired EP0015186B1 (de) 1979-02-23 1980-02-05 Dreikanaliges akustisches System

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US (1) US4326099A (de)
EP (1) EP0015186B1 (de)
DE (1) DE3070893D1 (de)
FR (1) FR2450019A1 (de)

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US4350847A (en) * 1981-01-12 1982-09-21 Polk Audio, Inc. Subwoofer system using a passive radiator
NL8300011A (nl) * 1983-01-04 1984-08-01 Philips Nv Luidsprekerinrichting met een of meer vlakke membranen.
US4882760A (en) * 1983-12-02 1989-11-21 Yee Raymond M Sound reproduction system
IT8423959V0 (it) * 1984-11-30 1984-11-30 Fricker Eric Franzini Angelo Cassa acustica singola ad effetto spaziale per impianti di riproduzione musicale.
US4932060A (en) * 1987-03-25 1990-06-05 Bose Corporation Stereo electroacoustical transducing
JPH0628876Y2 (ja) * 1988-03-01 1994-08-03 株式会社ケンウッド 低音域再生用スピーカシステム
FR2632801A1 (fr) * 1988-06-14 1989-12-15 Voise Serge Adaptateur pour acoustique curviligne
JP2673002B2 (ja) * 1989-03-31 1997-11-05 株式会社ケンウッド スピーカシステム
TW203674B (de) * 1991-07-09 1993-04-11 Tong Hoon Sohn
US5602367A (en) * 1994-12-19 1997-02-11 Meyer Sound Laboratories Incorporated Multiple tuned high power bass reflex speaker system
US5815589A (en) * 1997-02-18 1998-09-29 Wainwright; Charles E. Push-pull transmission line loudspeaker
ATE496495T1 (de) * 1999-03-03 2011-02-15 Onkyo Kk Lautsprechersystem
EP1229760B1 (de) * 2001-01-22 2005-12-28 Matsushita Electric Industrial Co., Ltd. Lautsprechersystem
MXPA01007784A (es) * 2001-08-01 2003-02-10 Carlos Viterbo Estrad Gonzalez Mejoras en la reproduccion de sonidos.
WO2004095880A2 (de) * 2003-04-24 2004-11-04 Roland Roth Ton- und/oder bildwiedergabegerät und verwendung eines abnehmbaren bedienpanels
US7840018B2 (en) * 2006-09-30 2010-11-23 Harman International Industries, Incorporated In-wall sub-woofer system with high-volume displacement
KR20120014591A (ko) * 2009-05-18 2012-02-17 노우레스 일렉트로닉스, 엘엘시 감소된 진동 감도를 갖는 마이크로폰
US10165369B1 (en) 2018-03-14 2018-12-25 Honda Motor Co., Ltd. Vehicle audio system
US10531199B2 (en) 2018-03-14 2020-01-07 Honda Motor Co., Ltd. Vehicle sound system
CN109714688A (zh) * 2019-02-19 2019-05-03 苏州上声电子股份有限公司 一种扬声器系统

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US3609240A (en) * 1970-03-18 1971-09-28 Ind Patent Dev Corp Stereophonic headphones
US3688864A (en) * 1970-04-16 1972-09-05 Talbot American Corp Infinite dynamic damping loudspeaker systems
US3892917A (en) * 1971-10-07 1975-07-01 Nippon Musical Instruments Mfg Speaker system for multichannel stereosignal reproduction
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FR2340012A1 (fr) * 1976-01-30 1977-08-26 Pascal Alain Transducteur electro-acoustique
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JPS5552694A (en) * 1978-10-12 1980-04-17 Mitsubishi Electric Corp Speaker system

Also Published As

Publication number Publication date
US4326099A (en) 1982-04-20
DE3070893D1 (en) 1985-08-29
EP0015186A1 (de) 1980-09-03
FR2450019A1 (fr) 1980-09-19
FR2450019B1 (de) 1982-04-02

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