EP0781071A1 - Steuerungsverfahren für einen Summer - Google Patents

Steuerungsverfahren für einen Summer Download PDF

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Publication number
EP0781071A1
EP0781071A1 EP96402857A EP96402857A EP0781071A1 EP 0781071 A1 EP0781071 A1 EP 0781071A1 EP 96402857 A EP96402857 A EP 96402857A EP 96402857 A EP96402857 A EP 96402857A EP 0781071 A1 EP0781071 A1 EP 0781071A1
Authority
EP
European Patent Office
Prior art keywords
frequency
buzzer
signal
excitation
sensor
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Withdrawn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
EP96402857A
Other languages
English (en)
French (fr)
Inventor
Stéphane Manac'h
François CHAMBON
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.)
Sagem SA
Original Assignee
Sagem SA
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 Sagem SA filed Critical Sagem SA
Publication of EP0781071A1 publication Critical patent/EP0781071A1/de
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B3/00—Audible signalling systems; Audible personal calling systems
    • G08B3/10—Audible signalling systems; Audible personal calling systems using electric transmission; using electromagnetic transmission
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • B06B1/0207—Driving circuits
    • B06B1/0223—Driving circuits for generating signals continuous in time
    • B06B1/0269—Driving circuits for generating signals continuous in time for generating multiple frequencies
    • 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

Definitions

  • the present invention relates to a method for controlling a buzzer.
  • a buzzer is used to produce an acoustic signal intended to attract the attention of close people in order to inform them of the occurrence of an event.
  • Electronic terminals are frequently fitted with this.
  • the buzzer is excited by an electrical signal at a certain frequency and it produces an acoustic signal at this frequency.
  • the buzzer has maximum efficiency at one or a few specific resonance frequencies, depending on its constitution, it is excited at one of these frequencies in order to use it best and avoid having to use a more powerful buzzer, therefore more expensive, bulky and consuming more.
  • the resonant frequencies vary from one buzzer to another in the same series and, moreover, they can drift in temperature, so that an initial adjustment of the excitation frequency is only effective. limited.
  • the present invention aims to overcome this uncertainty on the resonance frequency of the buzzer.
  • the invention relates to a method for controlling a buzzer, in which an excitation is applied to the buzzer at a determined frequency, characterized in that the acoustic signal, produced by the buzzer, is reinjected into a sensor acoustics controlling the frequency of said excitation.
  • the sensitivity spectrum of the buzzer can be determined, which makes it possible to avoid using it at frequencies at which it exhibits poor performance. It can thus be ensured that it emits an acoustic level which, without guaranteeing an absolute maximum, represents at least a relative maximum in a range of excitation frequencies.
  • a spectrum of ambient noise frequencies is determined by means of an acoustic sensor and the excitation frequency is chosen in a range substantially outside of said spectrum.
  • the acoustic signal is provided with an additional sound relief since the human ear has frequency selectivity allowing it to detect an acoustic signal drowned in noise at a different frequency.
  • the telephone set represented here is a mobile station for GSM mobile telephony. It includes a microphone 1 controlling an analog / digital converter 2 connected as an output to a circuit 3 controlling a buzzer 5 through a digital / analog converter 4.
  • the reference 6 designates an acoustic coupling between the buzzer 5 and the microphone 1.
  • the other circuits of the station ensuring the actual telephone function, are conventional and are not shown. Note, however, that in this example, the microphone 1 and the CAN 2 are also used for the telephone function.
  • the circuit 3 comprises in order, from its input receiving the CAN 2 values to its output controlling the DAC 4, a tunable bandpass filter 30, a comparator 32, a calculation block 33, a scanning control circuit in frequency, or wobulation, 34 and a wobulator oscillator 35 with frequency controlled by the circuit 34, which also controls the tuning of the filter 30.
  • a memory 31 is connected, as a data input, to both the output of the filter 30 and to the output of the circuit 34.
  • the output of the memory 31 feeds a second input of the comparator 32, connected by its first input to the filter 30 .
  • the calculation block 33 comprises a time base and a sequencer, not shown, for controlling the CAN and DAC circuits, 2 and 4, and for addressing the memory 31.
  • the buzzer 5 is excited at a determined frequency and, by the acoustic coupling 6, the acoustic signal, produced by the buzzer 5, is reinjected into the acoustic sensor 1, to control the frequency of the buzzer excitement 5.
  • the circuit 3 ensures the management of the control of the buzzer 5, as will now be explained.
  • the circuit 3 performs a wobulation of the control, or excitation, frequency of the buzzer 5 to search for one or more frequencies corresponding to a local maximum, such as Pa1, or to the absolute maximum Pa2, and to hang onto it.
  • the level of the signal reinjected is detected by CAN 2 and applied to the comparator 32 at the same time as it is stored in memory 31 for the next cycle.
  • the comparator 32 receiving, on its second input, the stored level of the signal received in the previous cycle, supplies the calculation block 33 with a level deviation signal representing the difference ⁇ N with sign of the two above signals.
  • the frequency of the previous signal, or at least a number representing it, which has been supplied by the control circuit 34 and stored in memory 31 in association with the level of the previous signal received, is also supplied to the calculation block 33, having still in memory the frequency of the current signal.
  • the calculation block 33 then sends to the wobulation circuit 34 a command to increase or decrease the current frequency F and the circuit 34 provides a command value of the oscillator 35 representing the value of the modified frequency F.
  • the oscillator 35 adjusts to this frequency, the control value of which is stored in memory 31.
  • the excitation frequency range must, for certain applications, be restricted to a limited range thereof, then at least a relative maximum level is detected there.
  • bandpass filtering is carried out here by means of the filter 30 tuned to the frequency of the oscillator 35.
  • a synchronous detection of the reinjected signal by comparing its phase with that of the signal of the oscillator 35, which considerably reduces the influence of noise.
  • Circuit 3 in this example is digital, but its function could also be ensured by an analog circuit tending to perform wobulation in the direction increasing the level reinjected.
  • the circuit 3 tends to achieve frequency latching, of the Larsen effect type, by using the acoustic coupling 6 between the buzzer 5 and the microphone 1, through the air as well as the body of the station.
  • an excitation frequency F which is substantially outside of the spectrum thereof.
  • the frequency spectrum of the ambient noise is determined by means of the microphone 1 and the excitation frequency is chosen in a range substantially outside this spectrum.
  • the noise spectrum is determined by a wobulation of the bandpass filter 30, the oscillator 35 then being put out of service or forced to a frequency not detected by the filter 30.
  • the calculation block 33 can then determine one or more frequency ranges that are almost free of noise.
  • the excitation frequency is then chosen in one of these ranges, which ensures the perception of the acoustic signal of the buzzer 5 thanks to the frequency selectivity of the human ear, even if the noise is of relatively high level compared to at this signal.
  • the frequency of excitation of the buzzer buzzer 5 can be chosen, according to the ambient noise, according to one of the following methods. It will be noted that the ringing is in fact made up of a frequency spectrum produced by an excitation signal in an adjustable frequency band, and by the non-linearity of response of the buzzer 5.
  • a spectral analysis of the ambient acoustic noise is carried out.
  • the excitation frequency of the buzzer 5 is then chosen by looking for a minimum of the residual energy, or spectral envelope, after the above filtering.
  • the Short Term Fourier transform, TFCT of the recorded ambient noise is determined and only the module of this transform is kept.
  • the TFCT is the Fourier transform of the signal multiplied by a sliding analysis window.
  • a time alignment is carried out by seeking a maximum of the correlation and, by comparison with the ringing signals, a minimum probability of the presence of ringing signal is sought in the noise.
  • the rhythm of the signal is preserved.
  • the TFCT spectrum of the acoustic signal is calculated and the frequency spectra of the ringing signal and the noise are compared to find a minimum of the formula of the type indicated above: ⁇ min [S ( ⁇ f); B (f)] df with respect to the multiplicative coefficient ⁇ , for adjusting the ringing signal.
  • the ringing signal In general, it is possible to weight the ringing signal and in particular to favor the spectral components thereof for which there is little ambient noise, that is to say to increase the sound relief of the components that the human ear can detect most easily.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
EP96402857A 1995-12-22 1996-12-20 Steuerungsverfahren für einen Summer Withdrawn EP0781071A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9515377A FR2742953B1 (fr) 1995-12-22 1995-12-22 Procede de commande d'un buzzer
FR9515377 1995-12-22

Publications (1)

Publication Number Publication Date
EP0781071A1 true EP0781071A1 (de) 1997-06-25

Family

ID=9485870

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96402857A Withdrawn EP0781071A1 (de) 1995-12-22 1996-12-20 Steuerungsverfahren für einen Summer

Country Status (2)

Country Link
EP (1) EP0781071A1 (de)
FR (1) FR2742953B1 (de)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2313978A (en) * 1996-06-05 1997-12-10 Nec Corp A portable telephone with automatic control of ringer volume
WO1999003259A2 (en) * 1997-07-10 1999-01-21 Ericsson Inc. Method and apparatus for controlling a telephone ring signal
WO1999005850A1 (en) * 1997-07-24 1999-02-04 Northern Telecom Limited Automatic volume control for a telephone ringer
EP0959608A1 (de) * 1998-05-19 1999-11-24 Robert Bosch Gmbh Telekommunikationsendgerät mit anpassung des Ruftons an Umgebungsgeräusche
EP0969680A2 (de) * 1998-06-30 2000-01-05 Nokia Mobile Phones Ltd. Automatisch variable Weckerlautstärke für Mobiltelefone
WO2000043963A1 (en) * 1999-01-25 2000-07-27 Maxon Systems Inc. (London) Ltd. Alert signal unit for an electronic device to compensate for the influence of an environment
GB2358077A (en) * 1999-10-28 2001-07-11 Vlsi Solution Oy Control coupling for a buzzer
GB2358553A (en) * 2000-01-21 2001-07-25 Motorola Ltd Generating alert signals according to ambient conditions
EP1414022A1 (de) * 2002-04-01 2004-04-28 Matsushita Electric Industrial Co., Ltd. Ansagevorrichtung
GB2404813A (en) * 2003-08-06 2005-02-09 Agilent Technologies Inc Volume control of loudspeaker

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4076968A (en) * 1976-09-02 1978-02-28 Bell Telephone Laboratories, Incorporated Telephone ringer intensity control responsive to ambient noise
GB2084783A (en) * 1980-10-02 1982-04-15 Production Eng Res Audio system
DE4021787A1 (de) * 1990-07-09 1992-01-16 Telefunken Electronic Gmbh Elektro-akustisches system
JPH06121008A (ja) * 1992-10-05 1994-04-28 Nitsuko Corp 電話機

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4076968A (en) * 1976-09-02 1978-02-28 Bell Telephone Laboratories, Incorporated Telephone ringer intensity control responsive to ambient noise
GB2084783A (en) * 1980-10-02 1982-04-15 Production Eng Res Audio system
DE4021787A1 (de) * 1990-07-09 1992-01-16 Telefunken Electronic Gmbh Elektro-akustisches system
JPH06121008A (ja) * 1992-10-05 1994-04-28 Nitsuko Corp 電話機

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 18, no. 407 (E - 1586) 29 July 1994 (1994-07-29) *

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2313978A (en) * 1996-06-05 1997-12-10 Nec Corp A portable telephone with automatic control of ringer volume
GB2313978B (en) * 1996-06-05 1998-08-19 Nec Corp Portable electronic apparatus with adjustable-volume output sound
US6044279A (en) * 1996-06-05 2000-03-28 Nec Corporation Portable electronic apparatus with adjustable-volume of ringing tone
AU718543B2 (en) * 1996-06-05 2000-04-13 Lenovo Innovations Limited (Hong Kong) Portable electronic apparatus with adjustable-volume of ringing tone
WO1999003259A2 (en) * 1997-07-10 1999-01-21 Ericsson Inc. Method and apparatus for controlling a telephone ring signal
WO1999003259A3 (en) * 1997-07-10 1999-04-01 Ericsson Ge Mobile Inc Method and apparatus for controlling a telephone ring signal
AU740803B2 (en) * 1997-07-10 2001-11-15 Ericsson Inc. Method and apparatus for controlling a telephone ring signal
WO1999005850A1 (en) * 1997-07-24 1999-02-04 Northern Telecom Limited Automatic volume control for a telephone ringer
US6246761B1 (en) 1997-07-24 2001-06-12 Nortel Networks Limited Automatic volume control for a telephone ringer
EP0959608A1 (de) * 1998-05-19 1999-11-24 Robert Bosch Gmbh Telekommunikationsendgerät mit anpassung des Ruftons an Umgebungsgeräusche
EP0969680A3 (de) * 1998-06-30 2000-09-13 Nokia Mobile Phones Ltd. Automatisch variable Weckerlautstärke für Mobiltelefone
EP0969680A2 (de) * 1998-06-30 2000-01-05 Nokia Mobile Phones Ltd. Automatisch variable Weckerlautstärke für Mobiltelefone
WO2000043963A1 (en) * 1999-01-25 2000-07-27 Maxon Systems Inc. (London) Ltd. Alert signal unit for an electronic device to compensate for the influence of an environment
GB2358077A (en) * 1999-10-28 2001-07-11 Vlsi Solution Oy Control coupling for a buzzer
GB2358553A (en) * 2000-01-21 2001-07-25 Motorola Ltd Generating alert signals according to ambient conditions
GB2358553B (en) * 2000-01-21 2002-04-10 Motorola Ltd Generation of alert signals in radio transceivers
EP1414022A1 (de) * 2002-04-01 2004-04-28 Matsushita Electric Industrial Co., Ltd. Ansagevorrichtung
EP1414022A4 (de) * 2002-04-01 2005-06-08 Matsushita Electric Ind Co Ltd Ansagevorrichtung
GB2404813A (en) * 2003-08-06 2005-02-09 Agilent Technologies Inc Volume control of loudspeaker
GB2404813B (en) * 2003-08-06 2006-11-29 Agilent Technologies Inc Method and apparatus for volume control
US7424120B2 (en) 2003-08-06 2008-09-09 Avago Technologies General Ip Pte Ltd Method and apparatus for volume control

Also Published As

Publication number Publication date
FR2742953B1 (fr) 1998-01-23
FR2742953A1 (fr) 1997-06-27

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