EP0624047A1 - Transduction asymétrique - Google Patents

Transduction asymétrique Download PDF

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Publication number
EP0624047A1
EP0624047A1 EP94303191A EP94303191A EP0624047A1 EP 0624047 A1 EP0624047 A1 EP 0624047A1 EP 94303191 A EP94303191 A EP 94303191A EP 94303191 A EP94303191 A EP 94303191A EP 0624047 A1 EP0624047 A1 EP 0624047A1
Authority
EP
European Patent Office
Prior art keywords
electroacoustical
electroacoustical transducing
transducing
accordance
input
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP94303191A
Other languages
German (de)
English (en)
Inventor
Timothy Holl
Dewey Potter
William Keezer
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.)
Bose Corp
Original Assignee
Bose Corp
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 Bose Corp filed Critical Bose Corp
Publication of EP0624047A1 publication Critical patent/EP0624047A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R5/00—Stereophonic arrangements
    • H04R5/02—Spatial or constructional arrangements of loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S1/00—Two-channel systems

Definitions

  • the present invention relates in general to electroacoustical transducing and more particularly concerns novel apparatus and techniques for stereo electroacoustical transducing.
  • the first electroacoustical transducing system is operative over substantially the full audio frequency range and is constructed and arranged to electroacoustically transduce input electrical signal spectral components in the upper frequency range of only a first stereo signal.
  • the second electroacoustical transducing system is constructed and arranged to electroacoustically transduce spectral components in the upper frequency range only and representative of only those spectral components of the second of first and second stereo signals.
  • the first electroacoustical transducing system preferably includes a first electroacoustical transducing structure for also transducing spectral components in the bass frequency range, preferably representing the sum of bass frequency spectral components in both the first and second stereo signals.
  • the first and second stereo signals are typically left and right signals.
  • the first electroacoustical transducing system radiates only spectral components in the bass frequency range sufficiently low so that the source thereof is nonlocalizable.
  • the first electroacoustical transducing system typically includes a summer having a first input connected to a first stereo signal input terminal and a second input coupled to a lowpass filter having its input coupled to a second stereo input terminal.
  • the first stereo electroacoustical transducing system typically includes a first equalizer and first amplifier intercoupling the output of the summer and the first electroacoustical transducing structure.
  • the first electroacoustical transducing structure typically includes a woofer and upper frequency driver with a capacitor coupling the output of the first amplifier to the upper frequency driver. Alternatively, there may be a full range driver coupled to the amplifier.
  • the second electroacoustical transducing system typically includes a second equalizer, a second amplifier and an upper frequency driver.
  • first and second enclosures there are first and second enclosures.
  • the first enclosure includes a woofer driver mounted between first and second subchambers ported to the outside embodying the principles of Bose U.S. Patent No. 4,549,631 with an angled panel carrying an upper frequency driver.
  • the second enclosure carries the second electroacoustical transducing system upper frequency driver on an angled panel and houses amplifiers and equalizers for both electroacoustical transducing systems.
  • the first electroacoustical system comprises an acoustic waveguide embodying the principles of Bose U.S. Patent No. 4,628,528.
  • the first and second electroacoustical transducing systems are carried within a single stereo receiver cabinet.
  • a first electroacoustical transducing system comprises left upper frequency driver 11 and woofer 12 that receive energy from power amplifier 13.
  • Capacitor 14 couples the output of power amplifier 13 to left upper frequency driver 11.
  • a second electroacoustical transducing system comprises right upper frequency driver 15 which receives energy from power amplifier 14.
  • Equalizer 16 couples right input terminal 17 to power amplifier 14.
  • Summer 21 and equalizer 22 couple left input terminal 23 to power amplifier 13.
  • Low pass filter 24 couples right input terminal 17 to a second input of summer 21 so that the output of summer 21 includes spectral components within the full audio frequency range of the left input signal incident upon left input terminal 23 and bass frequency spectral components of the right input signal incident upon right input terminal 17 so that woofer 12 electroacoustically transduces the sum of bass frequency spectral components incident upon left input terminal 23 and right input terminal 17 while capacitor 14 selectively transmits upper frequency spectral components, typically above a frequency of the order of 200 Hz, present in the left signal incident upon left input terminal 23 transduced by upper frequency driver 11.
  • the first electroacoustical transducing system may comprise a single full-range driver, such as a driver of the type used in the commercially available BOSE 901 loudspeaker system with equalizers 16 and 22 coacting with transducers 12 and 15 to provide substantially uniform radiated power as a function of frequency over substantially the full audio frequency range.
  • a driver of the type used in the commercially available BOSE 901 loudspeaker system with equalizers 16 and 22 coacting with transducers 12 and 15 to provide substantially uniform radiated power as a function of frequency over substantially the full audio frequency range.
  • Amplifier 13 typically has a higher maximum output power capability than amplifier 14 because there is usually more power radiated over the wider frequency range.
  • the effective frequency response of drivers 11 and 15 may be substantially the same without a capacitor coupling the output of amplifier 14 to right upper frequency driver 15.
  • Woofer 12 may be supported in a suitable enclosure to provide a desired system response.
  • a preferred form of enclosure is of the type described in Bose U.S. Patent No. 4,549,631 characterized by lowpass filtering characteristics so that the connection between power amplifier 13 and woofer 12 is free of costly passive components.
  • the woofer may comprise a dual-voicecoil driver with one voicecoil receiving left bass spectral components and the other voicecoil receiving right bass spectral components. It is also possible to couple the woofer to only one of the input terminals so that it radiates bass spectral components in the signal on that input terminal.
  • FIG. 2A there is shown a front view of left and right enclosures 33 and 31 in an exemplary embodiment of the invention.
  • Right enclosure 31 supports right upper frequency driver 15 on angled panel 32.
  • Left enclosure 33 supports left upper frequency driver 11 on angled panel 34.
  • Right enclosure 31 includes a low power equalizer-amplifier 35 for energizing right upper frequency driver 15 and a higher power equalizer-amplifier 36 for energizing woofer 12 and left upper frequency driver 11.
  • Right enclosure 31 is formed with a front opening 37 (FIG. 2A) and side openings 41 for allowing air circulation.
  • Upper frequency drivers 11 and 15 reside in like enclosures 11A and 15A, respectively.
  • Right enclosure 31 may also house a component such as a CD player, that may be adversely affected by vibration.
  • a component such as a CD player
  • the absence of bass radiation from this enclosure results in reduced mechanical vibration.
  • the enclosure may be visually symmetrical while being acoustically asymmetrical.
  • Woofer 12 resides in a multi-chambered enclosure having a first subchamber 42 coupled to the outside through port 43 and a second subchamber 44 coupled to the outside through port 45.
  • the first or left electroacoustical transducing system includes a full-range driver 52 at the front of an acoustic waveguide 53 that extends along the indicated dotted path to a far end opening 54 at the right of the enclosure.
  • the second or right electroacoustical transducing system comprises an upper frequency driver 55.
  • the channel 53A to the rear of driver 52 is filled with polyester that helps reduce resonant peaks.
  • This embodiment of the invention is used in the BOSE ACOUSTIC WAVE stereo receiver commercially available shortly after the filing date of this application.
  • This embodiment of the invention incorporates principles disclosed in Bose U.S. Patent No. 4,628,528 and described in the copending application filed on the same day as this application and claiming priority from US application No. 058478 filed on 6 May 1994.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Stereophonic System (AREA)
  • Stereophonic Arrangements (AREA)
EP94303191A 1993-05-06 1994-05-03 Transduction asymétrique Withdrawn EP0624047A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US5897293A 1993-05-06 1993-05-06
US58972 1997-09-12

Publications (1)

Publication Number Publication Date
EP0624047A1 true EP0624047A1 (fr) 1994-11-09

Family

ID=22020033

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94303191A Withdrawn EP0624047A1 (fr) 1993-05-06 1994-05-03 Transduction asymétrique

Country Status (3)

Country Link
EP (1) EP0624047A1 (fr)
JP (1) JPH07131899A (fr)
CN (1) CN1101202A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4446690A1 (de) * 1993-12-28 1995-06-29 Mitsubishi Electric Corp Zusammengesetzte Lautsprecheranordnung und Verfahren zu deren Ansteuerung
WO2017088876A3 (fr) * 2015-11-25 2017-09-28 Bang & Olufsen A/S Dispositif ou système de haut-parleur à champs sonores commandés
US10880636B2 (en) 2016-12-16 2020-12-29 Dolby Laboratories Licensing Corporation Audio speaker with full-range upward firing driver for reflected sound projection

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3582553A (en) * 1967-12-04 1971-06-01 Bose Corp Loudspeaker system
US4243840A (en) * 1978-12-22 1981-01-06 Teledyne Industries, Inc. Loudspeaker system
USRE31228E (en) * 1967-12-04 1983-05-03 Bose Corporation Loudspeaker system
US4424416A (en) * 1980-08-22 1984-01-03 Olympus Optical Company Ltd. Acoustic reproducing apparatus
EP0370619A2 (fr) * 1988-11-21 1990-05-30 Bose Corporation Système de son à plusieurs haut-parleurs pour un dispositif d'affichage vidéo

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3582553A (en) * 1967-12-04 1971-06-01 Bose Corp Loudspeaker system
USRE31228E (en) * 1967-12-04 1983-05-03 Bose Corporation Loudspeaker system
US4243840A (en) * 1978-12-22 1981-01-06 Teledyne Industries, Inc. Loudspeaker system
US4424416A (en) * 1980-08-22 1984-01-03 Olympus Optical Company Ltd. Acoustic reproducing apparatus
EP0370619A2 (fr) * 1988-11-21 1990-05-30 Bose Corporation Système de son à plusieurs haut-parleurs pour un dispositif d'affichage vidéo

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4446690A1 (de) * 1993-12-28 1995-06-29 Mitsubishi Electric Corp Zusammengesetzte Lautsprecheranordnung und Verfahren zu deren Ansteuerung
US5621804A (en) * 1993-12-28 1997-04-15 Mitsubishi Denki Kabushiki Kaisha Composite loudspeaker apparatus and driving method thereof
DE4446690B4 (de) * 1993-12-28 2007-04-05 Mitsubishi Denki K.K. Lautsprecheranordnung
WO2017088876A3 (fr) * 2015-11-25 2017-09-28 Bang & Olufsen A/S Dispositif ou système de haut-parleur à champs sonores commandés
US10448190B2 (en) 2015-11-25 2019-10-15 Bang & Olufsen A/S Loudspeaker device or system with controlled sound fields
US10880636B2 (en) 2016-12-16 2020-12-29 Dolby Laboratories Licensing Corporation Audio speaker with full-range upward firing driver for reflected sound projection

Also Published As

Publication number Publication date
CN1101202A (zh) 1995-04-05
JPH07131899A (ja) 1995-05-19

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