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WO1993014607A1 - Systeme de haut-parleur - Google Patents

Systeme de haut-parleur Download PDF

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Publication number
WO1993014607A1
WO1993014607A1 PCT/US1993/000154 US9300154W WO9314607A1 WO 1993014607 A1 WO1993014607 A1 WO 1993014607A1 US 9300154 W US9300154 W US 9300154W WO 9314607 A1 WO9314607 A1 WO 9314607A1
Authority
WO
WIPO (PCT)
Prior art keywords
loudspeakers
surround
phase
sound
loudspeaker system
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.)
Ceased
Application number
PCT/US1993/000154
Other languages
English (en)
Inventor
Christopher Noel Blair
Hal Perry Greenberger
Bradley Mark Starobin
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.)
Technicolor USA Inc
Original Assignee
Thomson Consumer Electronics Inc
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 Thomson Consumer Electronics Inc filed Critical Thomson Consumer Electronics Inc
Publication of WO1993014607A1 publication Critical patent/WO1993014607A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • H04R5/00—Stereophonic arrangements
    • H04R5/02—Spatial or constructional arrangements of loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2205/00—Details of stereophonic arrangements covered by H04R5/00 but not provided for in any of its subgroups
    • H04R2205/022—Plurality of transducers corresponding to a plurality of sound channels in each earpiece of headphones or in a single enclosure

Definitions

  • the present invention relates to loudspeaker systems, and more particularly to the surround channel loudspeaker for a DOLBY PRO LOGIC HOME THEATER system.
  • the Dolby system is a stereophonic system which includes surround sound encoding based upon 4-2-4 matrix methods for four-channel recording devised in the early 1970's.
  • the four original signals are mixed to make a two channel stereo recording which is decoded upon playback to recover an approximation of the original four channels, which are left, center, right, and surround.
  • the center channel signal is added to the left and right channels as a monophonic in-phase signal and the surround channel signal is added to the left and right channel signals as an out-of-phase signal.
  • the total left and total right channels are added together in a decoder to recover the center channel signal while the L-R subtraction extracts the out- of-phase surround channel signal.
  • the Dolby Pro Logic system provides a monophonic surround sound signal of a nominal frequency range of 100 Hz to 7 KHz to the surround loudspeakers.
  • the surround channel signal is delayed by about 20 milliseconds to prevent unwanted location of frontal sounds in the surround channel loudspeakers.
  • Dolby Pro-Logic decoders have steering circuits to detect which channel is loudest at each moment and to raise the volume of that channel while momentarily reducing the level of the other channels.
  • Surround sound is used to provide certain audio effects such as: 1) to create a sense of envelopment and spaciousness, and 2) to provide directional enhancement of certain special effects.
  • surround sound should be diffuse and arrive from all directions.
  • Most conventional surround systems use two direct radiating loudspeakers usually mounted on the side of the room or against the rear wall. In either case, the two separate loudspeakers are aimed directly at the listing area.
  • two direct radiating loudspeakers pointed at the listening area, reproduce the same signal, as would be the case if they were reproducing Dolby Pro Logic surround program material, the listeners will perceive the sound as coming directly from the loudspeaker closest to them.
  • the sense of spaciousness will be reduced or lost, regardless of where the loudspeakers are positioned in the room. While placement on the sides of the room would increase the lateral energy arriving at the listener's position and improve the sensation of spaciousness, the directional cues would be wrong for special effects. Should the loudspeakers be mounted at the rear of the room, the directional cues would be correct for special effects designed to come from behind, but the sense of spaciousness would be degraded.
  • Dipolar loudspeakers reduce the amount of direct sound that radiates into the listing area and localized sound is received only after reflecting off the walls. This effectively reduces the interaural correlation, and provides a greater sensation of spaciousness.
  • loudspeakers for both of the surround sound channels of a Dolby Pro Logic system are mounted on a common loudspeaker enclosure.
  • the loudspeaker enclosure is elongated with one of a pair of woofer loudspeakers, one for each channel, being mounted on each end.
  • An array of higher frequency loudspeakers, one array for each of the two surround channels, are mounted on the top of the enclosure between the ends.
  • the woofer loudspeakers of the two channels are wired out-of-phase.
  • Each of the higher frequency loudspeakers within an array are wired in-phase with each other, with each of the two arrays being wired out-of-phase with each other and spaced closer together than the woofer loudspeakers.
  • the specific geometrical spacing of the various drivers optimizes their lateral radiation pattern while broadening the on axis "null" region for preferred listing positions.
  • An additional benefit for enhanced spaciousness is provided by the steering of different frequency components in different directions. As the frequency content of the surround sound signal changes, the localized acoustic image changes position.
  • an elongated surround sound loudspeaker enclosure 10 wherein woofer loudspeakers 12L for the left channel surround signal, and 12R for right channel surround signal, are mounted on diametrically opposite ends 13.
  • Surround sound enclosure 10 is intended to be located behind the listening area, with woofers 12L and 12R radiating towards their respective side walls, and drivers 14L and 14R radiating upwards towards the ceiling.
  • both the left surround loudspeaker arrangement and the right surround loudspeaker arrangement are housed within a single enclosure which produces a spaciousness over its operating range.
  • Dolby Pro Logic decoder/amplifier products assign less power to the surround channel than the left, right, and center channel. This can create problems for the use of doplar loudspeakers which are inherently inefficient in that they rely on cancellation of the radiated sound in the on-axis direction through destructive interference.
  • One artifact of this cancellation is that frequencies above that frequency, which corresponds to driver separation equalling a quarter wavelength.
  • driver spacings for low and high frequency drivers the radiation pattern of the loudspeakers can be controlled while improving the efficiency of the loudspeakers.
  • the spacings are optimized for the general frequency range of the Dolby Pro Logic surround signals.
  • Loudspeakers 12L and 12R are 11.43 cm woofer loudspeakers, spaced apart 61 cm, which is a quarter wavelength for 140 Hz to provide a desired diffuse soundfield. Decreasing the separation distance would increase acoustic cancellation and increasing the distance would just produce a longer dimension speaker box without appreciably enhancing performance for a Pro Logic surround signal.
  • the left designated loudspeakers L and the right designated loudspeakers R are driven by their respective surround channel signals as provided by the Dolby Pro Logic sound system.
  • the Dolby Pro Logic L and R surround signals are identical.
  • great care is taken that woofers be wired in-phase with each other.
  • the woofer loudspeakers 12L and 12R herein are wired out-of- phase with each other for providing an unusual sound radiation pattern at low frequencies.
  • the usual surround loudspeakers, even those of the dipole variety, have radiation patterns which collapse to an easily localized monopolar pattern at low frequencies.
  • the present system with the low frequency woofer loudspeakers wired out-of-phase with appropriate spacing provides a broad, diffuse soundfield over the bass frequency range.
  • the middle and high frequencies for each surround sound channel are provided by a pair of 3.5 inch drivers 14L, 14R spaced apart 30.5 cm, which is a quarter wavelength for 280 Hz.
  • Each of the drivers of sub-arrays 14L and 14R operate in-phase with its companion and are directed upwardly towards the ceiling.
  • the sub-arrays 14L and 14R through a cross-over network (not shown), receive a higher frequency portion of the signal provided to loudspeakers 121, 12R, and are wired out-of-phase with the other sub-array, thereby providing acoustic cancellation of any sound directly radiating into the listening area.
  • the combined sound of the sub-arrays 14L and 14R radiates sound primarily towards the ceiling and side walls, and comparatively little is radiated directly into the listening area.
  • loudspeaker system 10 is intended to be positioned along a rear wall of the listening area while centered between the side walls. Since loudspeaker system 10 relies upon wall reflections for proper performance, loudspeaker system 10 also includes a high frequency level control (not shown) which allows the listener to compensate for different wall high-frequency absorption characteristics.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Stereophonic System (AREA)

Abstract

Dans cette invention les haut-parleurs destinés aux deux voies acoustiques de type 'surround' d'un système 'Dolby Pro Logic' sont montés dans une enceinte commune de haut-parleur. L'enceinte (10) de haut-parleur est de forme allongée et comprend deux haut-parleurs (12G, 12D) pour les graves qui sont respectivement destinés à chaque voie, et qui sont montés sur chaque extrémité (13). Des ensembles de haut-parleurs (14G, 14R) à fréquence supérieure, un ensemble étant prévu pour chacune des deux voies 'surround', sont montés sur un des côtés (15) de l'enceinte entre les extrémités (13). Les haut-parleurs (12G, 12D) pour les graves des deux voies sont câblés en déphasé. Chaque haut-parleur à fréquence supérieure situé dans un ensemble (14G, 14D) est câblé en phase avec l'autre haut-parleur de l'ensemble, chacun des deux ensembles (14G, 14D) étant câblé en déphasé avec l'autre ensemble. Les unités d'excitation (14G, 14D) des haut-parleurs à fréquence supérieure sont positionnées de manière plus rapprochée que les unités d'excitation (12G, 12D) des haut-parleurs à fréquence inférieure, afin d'optimiser le rendement de rayonnement et les schémas de directivité sur leur plage de fonctionnement.
PCT/US1993/000154 1992-01-08 1993-01-08 Systeme de haut-parleur Ceased WO1993014607A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9200301.1 1992-01-08
GB929200301A GB9200301D0 (en) 1992-01-08 1992-01-08 Loud speaker systems

Publications (1)

Publication Number Publication Date
WO1993014607A1 true WO1993014607A1 (fr) 1993-07-22

Family

ID=10708254

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1993/000154 Ceased WO1993014607A1 (fr) 1992-01-08 1993-01-08 Systeme de haut-parleur

Country Status (2)

Country Link
GB (1) GB9200301D0 (fr)
WO (1) WO1993014607A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1001771C2 (nl) * 1995-11-29 1997-05-30 Robert Jurrien Oliemuller Stereo-luidsprekerboxinrichting.
US6381335B2 (en) * 1999-08-25 2002-04-30 Gibson Guitar Corp. Audio speaker system for personal computer
WO2009112980A1 (fr) * 2008-03-14 2009-09-17 Koninklijke Philips Electronics N.V. Système sonore et procédé de fonctionnement associé
US20110216926A1 (en) * 2010-03-04 2011-09-08 Logitech Europe S.A. Virtual surround for loudspeakers with increased constant directivity
US8542854B2 (en) 2010-03-04 2013-09-24 Logitech Europe, S.A. Virtual surround for loudspeakers with increased constant directivity
WO2019041212A1 (fr) * 2017-08-31 2019-03-07 Harman International Industries, Incorporated Appareil de haut-parleur, son procédé de traitement de signaux d'entrée, et système audio

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3054856A (en) * 1959-02-24 1962-09-18 Arany Donald Sound reproducing system
US3268030A (en) * 1965-04-13 1966-08-23 Finn H Magnus Acoustic system
US3491204A (en) * 1967-05-12 1970-01-20 Stanley A Sherno Sound system circuit and cabinet assembly
US4418243A (en) * 1982-02-16 1983-11-29 Robert Genin Acoustic projection stereophonic system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3054856A (en) * 1959-02-24 1962-09-18 Arany Donald Sound reproducing system
US3268030A (en) * 1965-04-13 1966-08-23 Finn H Magnus Acoustic system
US3491204A (en) * 1967-05-12 1970-01-20 Stanley A Sherno Sound system circuit and cabinet assembly
US4418243A (en) * 1982-02-16 1983-11-29 Robert Genin Acoustic projection stereophonic system

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1001771C2 (nl) * 1995-11-29 1997-05-30 Robert Jurrien Oliemuller Stereo-luidsprekerboxinrichting.
WO1997020450A1 (fr) * 1995-11-29 1997-06-05 Oliemuller Robert Jurrien Systeme de haut-parleurs stereophoniques
US6381335B2 (en) * 1999-08-25 2002-04-30 Gibson Guitar Corp. Audio speaker system for personal computer
US8559661B2 (en) 2008-03-14 2013-10-15 Koninklijke Philips N.V. Sound system and method of operation therefor
US20110002468A1 (en) * 2008-03-14 2011-01-06 Koninklijke Philips Electronics N.V. Sound system and method of operation therefor
JP2011515926A (ja) * 2008-03-14 2011-05-19 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ サウンドシステム及びその動作方法
WO2009112980A1 (fr) * 2008-03-14 2009-09-17 Koninklijke Philips Electronics N.V. Système sonore et procédé de fonctionnement associé
US20110216926A1 (en) * 2010-03-04 2011-09-08 Logitech Europe S.A. Virtual surround for loudspeakers with increased constant directivity
CN102196334A (zh) * 2010-03-04 2011-09-21 罗技欧洲公司 用于具有增强的恒定方向性的扬声器的虚拟环绕
US8542854B2 (en) 2010-03-04 2013-09-24 Logitech Europe, S.A. Virtual surround for loudspeakers with increased constant directivity
US9264813B2 (en) 2010-03-04 2016-02-16 Logitech, Europe S.A. Virtual surround for loudspeakers with increased constant directivity
WO2019041212A1 (fr) * 2017-08-31 2019-03-07 Harman International Industries, Incorporated Appareil de haut-parleur, son procédé de traitement de signaux d'entrée, et système audio
CN111052763A (zh) * 2017-08-31 2020-04-21 哈曼国际工业有限公司 扬声器设备、用于处理其输入信号的方法以及音频系统
US11070909B2 (en) 2017-08-31 2021-07-20 Harman International Industries, Incorporated Speaker apparatus, method for processing input signals thereof, and audio system
CN111052763B (zh) * 2017-08-31 2021-11-19 哈曼国际工业有限公司 扬声器设备、用于处理其输入信号的方法以及音频系统

Also Published As

Publication number Publication date
GB9200301D0 (en) 1992-02-26

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