EP0555787B1 - Combined active deresonator and ambience generator - Google Patents

Combined active deresonator and ambience generator Download PDF

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Publication number
EP0555787B1
EP0555787B1 EP93101873A EP93101873A EP0555787B1 EP 0555787 B1 EP0555787 B1 EP 0555787B1 EP 93101873 A EP93101873 A EP 93101873A EP 93101873 A EP93101873 A EP 93101873A EP 0555787 B1 EP0555787 B1 EP 0555787B1
Authority
EP
European Patent Office
Prior art keywords
room
loudspeaker
pressure
electrical signal
ambience generator
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 - Lifetime
Application number
EP93101873A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0555787A3 (en
EP0555787A2 (en
Inventor
Juha Kuusama
Aki Mäkivirta
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.)
Nokia Technology GmbH
Original Assignee
Nokia Technology GmbH
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 Nokia Technology GmbH filed Critical Nokia Technology GmbH
Publication of EP0555787A2 publication Critical patent/EP0555787A2/en
Publication of EP0555787A3 publication Critical patent/EP0555787A3/en
Application granted granted Critical
Publication of EP0555787B1 publication Critical patent/EP0555787B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K15/00—Acoustics not otherwise provided for
    • G10K15/08—Arrangements for producing a reverberation or echo sound

Definitions

  • the present invention relates to a device to be used for changing the acoustic properties of a room, comprising a pressure transducer, a loudspeaker and an electronic control circuit adapted to generate, in response to pressure changes in the room, an electrical signal that serves to cancel the pressure change detected by the pressure transducer when it is reproduced through the loudspeaker.
  • a loudspeaker means an entity constituted by one or more loudspeaker elements possibly operating over different frequency ranges.
  • the listening space also has a great effect on the way how the music sounds. In most cases, the listening room is the greatest factor influencing sound reproduction.
  • the acoustics of the listening room can be improved for instance by using different acoustic panels to line the walls and ceiling.
  • Such passive methods are difficult to realize with frequencies below 200 Hz.
  • the equipment described in the introduction has been presented, with which equipment room resonances can be attenuated or eliminated. This is based on the fact that the device can cancel low-frequency acoustic waves. Placed in a corner of a room, the device is able to attenuate standing waves present in said corner.
  • Such a stand-alone active acoustic resonance suppressor has been described in the US patent 4,899,387. This apparatus is mounted in an upright, free-standing housing for eliminating unwanted reflected waves in a room.
  • the housing is intended to be placed in a location where undesired wave patterns, such as standing waves, are formed in order to offset or cancel such conditions. These conditions are offset by generating an acoustic signal which is the inverse of pressure waves at a particular location.
  • the pressure waves are sensed by a module, including a microphone which generates a corresponding electrical signal.
  • This signal is sent to an electrical circuit where an inverse signal is created which is then transmitted to a loudspeaker.
  • the loudspeaker output is directed toward the location where the standing waves would be formed.
  • the loudspeaker output nulls local acoustic waves so that no standing waves are formed.
  • the noise cancellation device described in this document is designed to attenuate noise present in the vehicle cabin which is generated by the vehicle engine.
  • the car entertainment apparatus may contain a tuner, a compact disc player, a cassette player and the like.
  • the device of the invention influences the properties of the room also with frequencies exceeding 200 Hz.
  • the device of the invention further includes an ambience generator adapted to receive an electrical signal proportional to the sound present in the room and to generate, in response to said signal, a signal which produces an accoustic field containing early reflections and reverberation in the room when reproduced through the loudspeaker.
  • the ambience generator receives the electrical signal proportional to the sound present in the room either directly from the sound reproduction equipment or through a microphone included in the equipment, said microphone most preferably being the same component that serves as a pressure transducer in connection with the control circuit.
  • the pressure transducer is most preferably a pressure sensing microphone.
  • FIG. 1 shows a circuit of the prior art for the active cancellation of low-frequency room resonances.
  • This circuit comprises a pressure sensing microphone 1 adapted to feed a control circuit 3 the output of which has been connected to a loudspeaker 2.
  • the pressure sensing microphone 1 senses the pressure present in the room at the location in which the device is placed.
  • the control circuit 3 strives to maintain the pressure sensed by the pressure sensing microphone 1 at zero by generating a signal which, reproduced through the loudspeaker 2, cancels the pressure at the pressure sensing microphone 1. Thus a so called acoustic throat is created. If a positive pressure peak (acoustic wave) arrives at the pressure sensing microphone 1, the beam of the loudspeaker 2 will move backwards, whereupon the pressure at the microphone 1 decreases.
  • a positive pressure peak acoustic wave
  • the device "absorbs" the acoustic wave.
  • the result is the elemination or attenuation of room resonances.
  • the effective frequency range is about 20 - 200 Hz.
  • Figure 2 shows a device of the invention for changing the acoustic properties of a room.
  • This device comprises as a basis the device of Figure 1 in its entirety.
  • the device comprises an ambience generator 4 which also feeds its output to the loudspeaker 2. Therefore, the outputs of the control circuit 3 and ambience generator 4 are summed at point 6.
  • the loudspeaker 2 can be a loudspeaker capable of reproducing only low frequencies. In the device of the invention, however, the loudspeaker 2 must be able to reproduce the entire frequency band of the audio range, that is, about 20 to 20 000 Hz.
  • the ambience generator 4 has been adapted to receive its control signal, which must be a signal proportional to the sound present in the space where the device is located, either directly from the sound reproduction equipment 5 or from the pressure sensing microphone 1.
  • Figure 3 shows the acoustic waves present in a room when the listener 7 and the sound source 8 are stationed centrally in the room opposite one another.
  • the listener 7 receives from the sound source 8 first a direct acoustic wave indicated with a large arrow and additionally early reflections indicated in solid line and reverberations indicated in broken line.
  • the reverberation field must be dense enough and have sufficient duration.
  • music reproduced in a room furnished with the equipment of the invention can sound the same as for instance in a concert hall.
  • the ambience generator 4 is adapted to produce for instance signals of the kind shown in Figure 4.
  • signals In this Figure, direct sound received by the ambience generator either directly in an electrical form from the sound reproduction equipment 5 or by "listening" in the room by means of a microphone, for instance a pressure sensing microphone 1, is illustrated furthest left on the time axis t.
  • the ambience generator 4 In response to the signal received, the ambience generator 4 generates signals which have in Figure 4 been denoted as early reflections and reverberations. These are signals corresponding to direct sound, but they are appropriately delayed and attenuated.
  • the reverberation produced by the ambience generator should preferably be adapted to the inherent reverberation of the room in order for the final result to be the optimum.
  • the ambience generator is preferably able to generate several signal patterns of different types corresponding to Figure 4, and in these patterns the number and power level of the early reflections vary to some extent, as do the level and number of the reverberation signals.
  • the device of the invention has been described mainly schematically by means of one exemplary embodiment, and it will be appreciated that the device described can be realized by means of electronic solutions of many different kinds without, however, departing from the essential idea of the invention as defined in the appended claims.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Circuit For Audible Band Transducer (AREA)
EP93101873A 1992-02-13 1993-02-06 Combined active deresonator and ambience generator Expired - Lifetime EP0555787B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI920608A FI94565C (sv) 1992-02-13 1992-02-13 Anordning att användas för förändring av de akustiska egenskaperna i ett rumsutrymme
FI920608 1992-02-13

Publications (3)

Publication Number Publication Date
EP0555787A2 EP0555787A2 (en) 1993-08-18
EP0555787A3 EP0555787A3 (en) 1993-11-24
EP0555787B1 true EP0555787B1 (en) 1997-05-14

Family

ID=8534580

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93101873A Expired - Lifetime EP0555787B1 (en) 1992-02-13 1993-02-06 Combined active deresonator and ambience generator

Country Status (4)

Country Link
EP (1) EP0555787B1 (sv)
JP (1) JP3364260B2 (sv)
DE (1) DE69310561T2 (sv)
FI (1) FI94565C (sv)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3920226B2 (ja) * 2002-12-09 2007-05-30 ティーオーエー株式会社 共鳴周波数検出方法、共鳴周波数選択方法、および、共鳴周波数検出装置
JP4696142B2 (ja) * 2008-05-29 2011-06-08 ティーオーエー株式会社 共鳴周波数検出方法および共鳴周波数検出装置
US8553898B2 (en) 2009-11-30 2013-10-08 Emmet Raftery Method and system for reducing acoustical reverberations in an at least partially enclosed space
CN112461437B (zh) * 2020-11-24 2022-07-05 深圳市锐尔觅移动通信有限公司 气压检测电路、方法、设备及存储介质

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4899387A (en) * 1988-12-02 1990-02-06 Threshold Corporation Active low frequency acoustic resonance suppressor

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2646210B2 (ja) * 1987-05-27 1997-08-27 ヤマハ株式会社 電気音響的残響支援装置
GB8903201D0 (en) * 1989-02-13 1989-03-30 Lotus Group Plc Noise suppression in vehicles

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4899387A (en) * 1988-12-02 1990-02-06 Threshold Corporation Active low frequency acoustic resonance suppressor

Also Published As

Publication number Publication date
FI920608A (sv) 1993-08-14
EP0555787A3 (en) 1993-11-24
JP3364260B2 (ja) 2003-01-08
DE69310561T2 (de) 1997-11-13
FI94565B (sv) 1995-06-15
EP0555787A2 (en) 1993-08-18
DE69310561D1 (de) 1997-06-19
FI94565C (sv) 1995-09-25
JPH05346792A (ja) 1993-12-27
FI920608A0 (sv) 1992-02-13

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