EP0989542A1 - Procédé et dispositif pour la suppression active du bruit pour des bornes téléphoniques - Google Patents

Procédé et dispositif pour la suppression active du bruit pour des bornes téléphoniques Download PDF

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Publication number
EP0989542A1
EP0989542A1 EP99115460A EP99115460A EP0989542A1 EP 0989542 A1 EP0989542 A1 EP 0989542A1 EP 99115460 A EP99115460 A EP 99115460A EP 99115460 A EP99115460 A EP 99115460A EP 0989542 A1 EP0989542 A1 EP 0989542A1
Authority
EP
European Patent Office
Prior art keywords
microphone
telephone
noise
arrangement
ambient
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Withdrawn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
EP99115460A
Other languages
German (de)
English (en)
Inventor
Volkmar Dr.-Ing. Naumburger
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.)
Deutsche Telekom AG
Original Assignee
Deutsche Telekom AG
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 Deutsche Telekom AG filed Critical Deutsche Telekom AG
Publication of EP0989542A1 publication Critical patent/EP0989542A1/fr
Withdrawn legal-status Critical Current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
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1785—Methods, e.g. algorithms; Devices
    • G10K11/17853—Methods, e.g. algorithms; Devices of the filter
    • G10K11/17854—Methods, e.g. algorithms; Devices of the filter the filter being an adaptive filter
    • 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
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1785—Methods, e.g. algorithms; Devices
    • G10K11/17857—Geometric disposition, e.g. placement of microphones
    • 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
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1787—General system configurations
    • G10K11/17879—General system configurations using both a reference signal and an error signal
    • G10K11/17881—General system configurations using both a reference signal and an error signal the reference signal being an acoustic signal, e.g. recorded with a microphone
    • 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
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/10—Applications
    • G10K2210/12—Rooms, e.g. ANC inside a room, office, concert hall or automobile cabin
    • 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
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/30—Means
    • G10K2210/301—Computational
    • G10K2210/3027—Feedforward

Definitions

  • the invention relates to a method and a device for active Noise reduction in open telephone booths.
  • Public telephone booths are at least one-sidedly open in buildings Construction attached and operated. This is done for cost reasons, because the effort to build such an open telephone booth is less than with a closed version. But also be outdoors increasingly open telephone booths installed in a weatherproof design. But now is in buildings such as station halls or check-in halls Airports encounter an increased level of noise. Even outdoors are depending Installation site also noise emissions from road traffic or from Public traffic available. As a remedy at the current status of Technology predominantly passive countermeasures like bells around that Telephone or soundproofing construction measures used. This However, measures are not optimal with regard to the effect. From the American patent US 5,594,803 is now a device and a Processes known to address the environmental noise from open telephone booths To reduce platforms. This is one of a variety of removed microphones recorded sound according to the corresponding Processing fed into the phone booth in opposite phase. The disadvantage here is a very large technical effort, which is low volume of calls and thus low fee income in Telephone booths not economically affected by ambient noise justifies.
  • the present invention is therefore based on the object Method and device for active noise reduction in Open design phone booths avoiding the disadvantages of state the above-mentioned technology.
  • the object is in connection with the preamble of claim 1 solved in that with the help of a simple speaker and Microphone arrangement and an arrangement of digital filters Ambient noise that penetrates into the phone booth is compensated becomes.
  • the signal from the surrounding microphone is recorded using a Low pass filter reduced to the range up to about 800 Hz.
  • the A / D conversion it goes through an adaptive filter.
  • the active noise reduction method has the greatest effect where the speech microphone of the telephone is located.
  • the Speakers in the phone booth ensured that the running times of the Sound waves from direct sound are the same as those from the loudspeaker coming are and continue to be largely parallel run.
  • This causes the compensation to be over a relatively wide range Spectral range is independent of location.
  • the compensation is preferably so set that the low-frequency components of the ambient noise be dampened the most. This corresponds to the energy distribution in natural sounds. Not the opposite at high frequencies Effect, an amplification occurs due to differences in runtime according to the invention a band limitation of the compensating signal made by a fixed digital filter. That prevents the compensation of the high frequencies on the microphone of the phone, does not have such a disturbing effect, since these higher-frequency spectral parts anyway no longer appear very energetic.
  • the dimensioning of the Cutoff frequency is such that within a volume of 15 cm to 20 cm radius no significant differences in transit time can occur. At a speed of sound of 340 m / s, this corresponds to an upper one Frequency from about 500 Hz to 800 Hz. Thus, the digital low-pass filter suppress all vibrations above this frequency.
  • FIG. 1 shows the constructive arrangement of the two compensation loudspeakers 3.1 and 3.2 and the ambient microphone 4 in an open telephone booth 2 with any telephone 1 .
  • FIG. 2 shows the electrical arrangement using a block circuit.
  • the ambient microphone 4 detects the sound outside the open telephone booth and converts it into an electrical signal.
  • An analog / digital converter and a digital low-pass filter with a cut-off frequency of 500 Hz to 800 Hz follow.
  • the microphone 13 of the telephone detects signals. This signal consists of a sum of the useful signal of the speaker and disturbing ambient noise.
  • the signal is routed to the connecting line a / b via the telephone circuit 14, which is only shown schematically here, as well as to the low-pass filter 10 after analog / digital conversion in the A / D converter 11 .
  • the now band-limited signal mixture is forwarded to the LMS optimizer (least mean square) 9 , where the optimal filter coefficients for the adaptive filter 7 (7.1 to 7.N) are calculated.
  • the ambient noise coming from the environmental microphone 4 and band-limited in the low-pass filter 6 is evaluated.
  • Via the summer 8 and after D / A conversion in the converter 15 it is passed to the compensation loudspeakers 3.1 and 3.2 .
  • This modified and re-emitted ambient signal overlaps at the location of the telephone microphone so that both components are largely extinguished.
  • the signal path to the earpiece 12 of the telephone corresponds to that in a telephone booth which is not noise-insulated with active measures.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Telephone Function (AREA)
EP99115460A 1998-09-18 1999-08-05 Procédé et dispositif pour la suppression active du bruit pour des bornes téléphoniques Withdrawn EP0989542A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19842804 1998-09-18
DE19842804A DE19842804A1 (de) 1998-09-18 1998-09-18 Verfahren und Vorrichtung zur aktiven Geräuschminderung in offenen Telefonzellen

Publications (1)

Publication Number Publication Date
EP0989542A1 true EP0989542A1 (fr) 2000-03-29

Family

ID=7881410

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99115460A Withdrawn EP0989542A1 (fr) 1998-09-18 1999-08-05 Procédé et dispositif pour la suppression active du bruit pour des bornes téléphoniques

Country Status (2)

Country Link
EP (1) EP0989542A1 (fr)
DE (1) DE19842804A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007048692A1 (fr) * 2005-10-25 2007-05-03 Anocsys Ag Procede d'evaluation d'une fonction de transfert au moyen d'un algorithme adaptatif et dispositif pour mettre en oeuvre ce procede
EP1806840A1 (fr) 2006-01-05 2007-07-11 Siemens Schweiz AG Gain adaptatif pour l'ajustement du volume de la voix
CN108632712A (zh) * 2018-06-22 2018-10-09 常州倍速智能科技有限公司 一种具有主动降噪功能的抗噪消音亭

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1941492A1 (fr) * 2005-10-25 2008-07-09 Anocsys AG Procede d'evaluation d'un signal utile au moyen d'un processus adaptatif

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2088951A (en) * 1980-12-05 1982-06-16 Lord Corp Acoustic attenuators with active sound cancelling
JPH06232953A (ja) * 1993-01-29 1994-08-19 Kinki Sharyo Co Ltd 車両電話室用アクティブ消音装置
JPH0715566A (ja) * 1993-06-24 1995-01-17 Sekisui Chem Co Ltd 消音装置並びにこれを備える無騒音電話機及び無騒音電話ボックス
US5416846A (en) * 1993-05-25 1995-05-16 Matsushita Electric Industrial Co., Ltd. Noise control system and method
US5594803A (en) 1992-03-11 1997-01-14 Mitsubishi Denki Kabushiki Kaisha Silencing apparatus operable to reduce vehicle noise at a telephone

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8529279U1 (de) * 1985-10-15 1986-05-07 Jachmann-Technik GmbH, 3167 Burgdorf Schallschutzhaube für an Wandhaltern oder Standmasten befestigte Kastentelefone
DE29710810U1 (de) * 1997-06-20 1997-08-21 RRG Industrietechnik GmbH, 45470 Mülheim Telefonzelle

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2088951A (en) * 1980-12-05 1982-06-16 Lord Corp Acoustic attenuators with active sound cancelling
US5594803A (en) 1992-03-11 1997-01-14 Mitsubishi Denki Kabushiki Kaisha Silencing apparatus operable to reduce vehicle noise at a telephone
JPH06232953A (ja) * 1993-01-29 1994-08-19 Kinki Sharyo Co Ltd 車両電話室用アクティブ消音装置
US5416846A (en) * 1993-05-25 1995-05-16 Matsushita Electric Industrial Co., Ltd. Noise control system and method
JPH0715566A (ja) * 1993-06-24 1995-01-17 Sekisui Chem Co Ltd 消音装置並びにこれを備える無騒音電話機及び無騒音電話ボックス

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 018, no. 608 (E - 1633) 18 November 1994 (1994-11-18) *
PATENT ABSTRACTS OF JAPAN vol. 1995, no. 04 31 May 1995 (1995-05-31) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007048692A1 (fr) * 2005-10-25 2007-05-03 Anocsys Ag Procede d'evaluation d'une fonction de transfert au moyen d'un algorithme adaptatif et dispositif pour mettre en oeuvre ce procede
EP1806840A1 (fr) 2006-01-05 2007-07-11 Siemens Schweiz AG Gain adaptatif pour l'ajustement du volume de la voix
CN108632712A (zh) * 2018-06-22 2018-10-09 常州倍速智能科技有限公司 一种具有主动降噪功能的抗噪消音亭

Also Published As

Publication number Publication date
DE19842804A1 (de) 2000-03-23

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