WO2002037816A2 - Procede d'utilisation d'un systeme mains-libres et/ou d'un haut-parleur dans un terminal telephonique mobile - Google Patents

Procede d'utilisation d'un systeme mains-libres et/ou d'un haut-parleur dans un terminal telephonique mobile Download PDF

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Publication number
WO2002037816A2
WO2002037816A2 PCT/DE2001/004120 DE0104120W WO0237816A2 WO 2002037816 A2 WO2002037816 A2 WO 2002037816A2 DE 0104120 W DE0104120 W DE 0104120W WO 0237816 A2 WO0237816 A2 WO 0237816A2
Authority
WO
WIPO (PCT)
Prior art keywords
transducer
loudspeaker
hands
ear
impedance
Prior art date
Application number
PCT/DE2001/004120
Other languages
German (de)
English (en)
Other versions
WO2002037816A3 (fr
Inventor
Gerd Böhnke
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2002037816A2 publication Critical patent/WO2002037816A2/fr
Publication of WO2002037816A3 publication Critical patent/WO2002037816A3/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
    • H04M1/6033—Substation equipment, e.g. for use by subscribers including speech amplifiers for providing handsfree use or a loudspeaker mode in telephone sets
    • H04M1/6041—Portable telephones adapted for handsfree use
    • H04M1/605—Portable telephones adapted for handsfree use involving control of the receiver volume to provide a dual operational mode at close or far distance from the user
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/04—Circuits for transducers, loudspeakers or microphones for correcting frequency response

Definitions

  • the invention relates to a method for operating a hands-free speaker and / or a loudspeaker in a mobile part of a mobile radio terminal, in which a loudspeaker with transducer plates or a membrane also serves as a hearing capsule.
  • a mobile part of a mobile radio terminal has an earpiece with which the voice signals transmitted from a base station to the mobile part are reproduced by closely fitting the handset to the ear cup.
  • the earpiece contains an electromechanical component, a transducer, with which electrical signals that are transmitted over the transmission path between the handset and the base station are converted into acoustic signals that are audible to the user.
  • the transducers work according to the electromagnetic, electrodynamic, electrostatic or piezoelectric principle. The transducer generates a low sound pressure level because the earpiece is located directly on the ear and it only has to radiate into a small, closed volume.
  • the object of the invention is therefore to present a safe method with which unintentional incorrect operation when switching from the earpiece to the loudspeaker is avoided.
  • the reaction to the sound-generating transducer can be clearly assigned to the electrical impedance at most natural frequencies of the eigenmodes of the transducer plates or membranes. With a voltage assumed to be constant, the current at a specific frequency is therefore a measure of the acoustic load which has an effect on the transducer. It can be clearly determined whether the handset is near the ear or in the free field. This ensures safe operation of the speakerphone or the loudspeaker in the handset and it can be reliably ruled out that a user suffers hearing damage due to the speaker being switched on unintentionally.
  • a threshold circuit is used to switch the converter on or off. This provides a simple and inexpensive way of avoiding hearing damage to the user of a handset. As soon as a predeterminable threshold value in the impedance is reached for a certain frequency, the hands-free speaker or loudspeaker is switched off when the handset approaches the ear. It is therefore impossible that the accidental approach of the handset to the ear keeps the sound pressure level so high that it can damage your hearing. It is also not possible to accidentally Turn on the speaker while the handset is near the ear.
  • the level is regulated continuously as a function of the acoustic load. Depending on the distance from the ear, even in the leak mode, an optimal volume can always be generated without the risk of causing hearing damage when approaching the ear.
  • the sound image is also controlled in addition to the level.
  • the different acoustic properties in the free field and close to the ear can be dealt with, as a result of which the speech signals emitted by the hands-free speaker and / or by the loudspeaker or by the transducer can be optimally recognized.
  • an optimal setting of both the volume and the recognizability is obtained.
  • the converter is only regulated when the electrical impedance changes by more than 50%, in particular by more than 70%.
  • Such a sharp change in the electrical impedance is very easy to demonstrate and is a clear indication that the handset is being moved close to or away from the ear.
  • Such a strong change in the electrical impedance is not possible at every natural frequency of the converter, so that a suitable natural frequency for the control must be found out in advance.
  • the only figure shows the course of the electrical impedance as a function of the acoustic load in an eigenmode.
  • the frequency of a signal is plotted on the abscissa in a range from just under 2 kHz to just over 5 kHz.
  • the electrical impedance is plotted on the ordinate above the frequency. It ranges from just under 60 dB to just under 69 dB.
  • the dB figures are given relative to 1 ohm.
  • the reproduced impedance curve is shown for a piezo transducer with an eigenmode. A total of three impedance curves can be seen.
  • a first impedance curve 1 is shown for an oscillation of the transducer in the free field. This means that the piezo transducer is not in the vicinity of an ear. At about 3.7 kHz, the converter changes its electrical impedance by about 80%.
  • a second impedance curve 2 is shown, which is given in the case of leakage operation. This means that the handset lies against the ear, but is not pressed against the ear cup so much that a closed volume is created between the earpiece and the interior of the ear. Rather, there are gaps between the pinna and the handset.
  • the converter can feel an acoustically higher impedance load here. This has a clear effect on the second impedance curve 2.
  • the first impedance curve 1 shows a strong change of approximately 80%
  • the second impedance curve 2 changes only very slightly.
  • the second impedance curve 2 also has a steep edge, which is, however, at a frequency of approximately 3.4 kHz. In addition, the change in impedance there is not as great as in the first impedance curve 1.
  • a third impedance curve 3 is shown for a handset that lies close to the ear. This results in a closed volume and the acoustic load that affects the transducer is particularly high-impedance. With that occurs further flatten the steep flank, which is now at even lower frequencies, in the range of approximately 3.2 kHz. The change in electrical impedance at 3.7 kHz is even smaller than in the second impedance curve 2.
  • the speaker or loudspeaker does not turn on at all if there is no predetermined change in impedance in the range of the frequency tested.
  • the impedance is preferably measured at a natural frequency which has the greatest possible change in impedance at the frequency tested. This ensures a very reliable determination of whether the handset is currently in the open field by means of the current.

Abstract

L'invention concerne un procédé d'utilisation d'un système mains-libres et/ou d'un haut-parleur dans l'élément mobile d'un terminal téléphonique, un amplificateur comportant des plaques de microphone ou une membrane servant simultanément de récepteur. Selon l'invention, le niveau appliqué au microphone est régulé en fonction de la charge acoustique à une certaine fréquence propre des plaques de microphone.
PCT/DE2001/004120 2000-11-03 2001-10-31 Procede d'utilisation d'un systeme mains-libres et/ou d'un haut-parleur dans un terminal telephonique mobile WO2002037816A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2000154610 DE10054610A1 (de) 2000-11-03 2000-11-03 Verfahren zum Betrieb eines Freisprechers und/oder Lauthörers in einem Mobilfunkendgerät
DE10054610.2 2000-11-03

Publications (2)

Publication Number Publication Date
WO2002037816A2 true WO2002037816A2 (fr) 2002-05-10
WO2002037816A3 WO2002037816A3 (fr) 2003-02-27

Family

ID=7662085

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2001/004120 WO2002037816A2 (fr) 2000-11-03 2001-10-31 Procede d'utilisation d'un systeme mains-libres et/ou d'un haut-parleur dans un terminal telephonique mobile

Country Status (2)

Country Link
DE (1) DE10054610A1 (fr)
WO (1) WO2002037816A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1523218A1 (fr) * 2003-10-10 2005-04-13 Sony Ericsson Mobile Communications AB Méthode de réglage d'un haut-parleur et dispositif de réglage associé

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0564160A2 (fr) * 1992-04-01 1993-10-06 AT&T Corp. Arrangement à commutateur d'un écouteur-parleur pour un dispositif de communication portatif
US5729604A (en) * 1996-03-14 1998-03-17 Northern Telecom Limited Safety switch for communication device
US5790679A (en) * 1996-06-06 1998-08-04 Northern Telecom Limited Communications terminal having a single transducer for handset and handsfree receive functionality

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0564160A2 (fr) * 1992-04-01 1993-10-06 AT&T Corp. Arrangement à commutateur d'un écouteur-parleur pour un dispositif de communication portatif
US5729604A (en) * 1996-03-14 1998-03-17 Northern Telecom Limited Safety switch for communication device
US5790679A (en) * 1996-06-06 1998-08-04 Northern Telecom Limited Communications terminal having a single transducer for handset and handsfree receive functionality

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1523218A1 (fr) * 2003-10-10 2005-04-13 Sony Ericsson Mobile Communications AB Méthode de réglage d'un haut-parleur et dispositif de réglage associé

Also Published As

Publication number Publication date
DE10054610A1 (de) 2002-05-23
WO2002037816A3 (fr) 2003-02-27

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121 Ep: the epo has been informed by wipo that ep was designated in this application
122 Ep: pct application non-entry in european phase
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