EP3337183A1 - Procédé et agencement de circuit destinés au fonctionnement d'un casque d'écoute - Google Patents

Procédé et agencement de circuit destinés au fonctionnement d'un casque d'écoute Download PDF

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Publication number
EP3337183A1
EP3337183A1 EP17204827.4A EP17204827A EP3337183A1 EP 3337183 A1 EP3337183 A1 EP 3337183A1 EP 17204827 A EP17204827 A EP 17204827A EP 3337183 A1 EP3337183 A1 EP 3337183A1
Authority
EP
European Patent Office
Prior art keywords
ear
headset
headphone
loudspeaker
resistance
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Withdrawn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
EP17204827.4A
Other languages
German (de)
English (en)
Inventor
Thomas Buck
Thomas Northemann
Stefan Leidich
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP3337183A1 publication Critical patent/EP3337183A1/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Withdrawn legal-status Critical Current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
    • H04R5/04—Circuit arrangements, e.g. for selective connection of amplifier inputs/outputs to loudspeakers, for loudspeaker detection, or for adaptation of settings to personal preferences or hearing impairments
    • 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
    • H04R5/033—Headphones for stereophonic communication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/1016—Earpieces of the intra-aural type
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2420/00—Details of connection covered by H04R, not provided for in its groups
    • H04R2420/03—Connection circuits to selectively connect loudspeakers or headphones to amplifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2460/00—Details of hearing devices, i.e. of ear- or headphones covered by H04R1/10 or H04R5/033 but not provided for in any of their subgroups, or of hearing aids covered by H04R25/00 but not provided for in any of its subgroups
    • H04R2460/15—Determination of the acoustic seal of ear moulds or ear tips of hearing devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R29/00—Monitoring arrangements; Testing arrangements
    • H04R29/001—Monitoring arrangements; Testing arrangements for loudspeakers

Definitions

  • the invention relates to a method and a circuit arrangement for operating a headset or a headset, in particular an in-ear headphone or a corresponding set, according to the preambles of the respective independent claims.
  • the present invention also relates to a computer program, a machine-readable data carrier for storing the computer program and an electronic control unit, by means of which the method according to the invention can be carried out.
  • So-called “in-the-ear” or “in-ear” headphones are often used in mobile terminals, e.g. in mobile phones, mobile music players or portable computers, e.g. Laptop or tablet computers.
  • the loudspeakers I use are mostly membrane loudspeakers driven by low-impedance magnetic coils.
  • the respective mobile terminal and the headphone interact in such a way that it is first detected whether there is an effective electrical connection between the terminal and the headset, and that at a detected electrical connection present in the terminal control or driver program an audio connection between an audio application and the headset.
  • the control of the audio application and corresponding functions such as volume control, selection of an audio file or the termination of a telephone connection is usually done by means arranged on the terminal controls such as buttons, touchscreen icons or the like.
  • an apparatus and method for detecting AC electrical resistance (impedance) of a headset for an electronic terminal is disclosed.
  • a signal or a correspondingly derived signal signature which is defined by a respectively present impedance characteristic of a load applied to the terminal, is between the presence of an electrical connection of the terminal with a headphone or the Existence of an electrical connection of the terminal with a self-amplified output device, which has a "line-level” input, distinguished.
  • a corresponding "line-out" amplifier and a suitable insulation resistance are activated at the terminal, by means of which the required for a line-out high voltage level or the correspondingly required high capacitive load can be provided or driven.
  • the method proposed here or the circuit arrangement for operating a headphone or a headphone with a terminal concerned here, in particular a corresponding in-ear headphones the idea is based on the electrical resistance, in particular the electrical AC resistance (impedance) To determine at least one speaker of an in-ear headphone, whether the headset is in the ear or outside the ear of a user.
  • the method is based on the technical effect that the electrical resistance or the alternating electrical resistance (impedance) of a loudspeaker or both loudspeakers in an in-ear loudspeaker caused by the sound pressure-induced acoustic attenuation of the loudspeaker membrane and / or by the inner chamber acoustic attenuation / Resonance effects, indirectly on by the Loud speaker flowing electrical current back and therefore influenced or changed accordingly.
  • the said effect can be further exploited to depending on the respective headset type or the speaker used therein and the respective user or the spatial configuration of his ear interior, signatures for the impedance history in the ear and outside of the ear arranged headphones generate, by means of which the detection of the affected state of use of the headphone can be performed even more precise and thus more reliable.
  • An embodiment of the proposed method provides that the electrical current flowing through at least one loudspeaker of the headset is detected as a function of the time that time-dependent resistance values are calculated from the detected electrical current values using a specifiable electrical drive voltage such that the time-dependent resistance values are determined by means of Fourier signals. Transformation are converted into frequency-dependent resistance values, and that it is detected from the resulting frequency-dependent resistance values, whether the headset is arranged in or on the ear or outside or away from the user's ear.
  • a frequency-dependent signature for the resistance characteristic is generated from the said frequency-dependent resistance values in headphones arranged in or on the ear and outside the ear, on the basis of which said detection is carried out.
  • the said recognition method is trained and thereby the recognition rate and / or the recognition quality are optimized or improved.
  • the proposed method makes it possible, even without additional sensors, to automatically interrupt or end the playback of an audio file in the terminal if it is determined that the headset is no longer on or in the ear of the user.
  • a telephony terminal When operating a telephony terminal can be alternatively or additionally provided in the proposed method that the terminal is automatically transferred to the handsfree operation or switched when recognizing that the headset is no longer on or in the ear of the user. This makes it possible that a telephone call already executed can be continued without interruption even when the headset falls out of the user's ear.
  • this has a load resistor electrically connected to at least one loudspeaker, a first amplifier for providing a bias voltage, so that a load voltage drops across the load resistor, and an A / D converter for detecting the resistance of the at least one loudspeaker.
  • voltage signals supplied by two loudspeakers and by a microphone are fed by means of a multiplexer to a single A / D converter.
  • the method or the circuit arrangement thus make possible a more intuitive or user-friendly operation of a headphone concerned here as well as a reduction of the energy consumption of an energy store (for example battery or rechargeable battery), in particular of a mobile terminal.
  • an energy store for example battery or rechargeable battery
  • the computer program according to the invention is set up to carry out each step of the method, in particular if it runs on a computing device or a control device. It allows the implementation of the method according to the invention on an electronic control unit, without having to make structural changes to this.
  • the machine-readable data carrier is provided on which the computer program according to the invention is stored.
  • the electronic control unit according to the invention is obtained, which is set up to control a headphone or a terminal operated with a headphone by means of the method according to the invention.
  • a headset with a terminal, in this case a conventional (not shown here) mobile phone, based on a in Fig. 1 detected circuitry detected.
  • the circuit shown is implemented in the terminal in the present example, but may alternatively also be partially or totally integrated in the headset.
  • the circuit is electrically connected to a stereo pair of loudspeakers 100 arranged on the headphones and to a microphone 105 likewise arranged on the headphones.
  • microphone / speaker combination is often used as a handsfree device for a mobile device, such as a smartphone.
  • the electrical connection of the terminal with the headphone by means of a conventional, four-pin connector with lines 110, with one energized line 115, 120 for the two speakers 100, a live line 125 for the microphone 105 and three interconnected ground lines 130 for both the loudspeakers 100 and the microphone 105.
  • the circuit includes an analog-to-digital (A / D) converter 135 connected to the live line 125 of the microphone 105, the output of which is indicated by the dashed line 145. Furthermore, the circuit comprises a digital / analog (D / A) converter 140 connected to the live lines 115, 120 of the loudspeaker pair 100, whose output signal is indicated by the dashed line 150.
  • the two converters 135, 140 are implemented in the mobile terminal in a respective CODEC (Encoder / Decoder) of the terminal. It should be noted that today's CODECs usually provide a variety of input and output channels and the Fig. 1 for simplicity's sake only has the few channels shown here.
  • the circuit shown includes a conventional bias supply 155 provided by a first amplifier (not shown) for the microphone 105 with series connected resistor 156 and ground potential 158 connected bias voltage source 157.
  • the output from the microphone 105 supplied signal is also amplified by means of a first amplifier 160.
  • the circuit comprises a second amplifier 165 for signal amplification of an audio signal supplied by the D / A converter 140 and transmitted to the loudspeaker pair 100.
  • the second amplifier 165 comprises, as is usual, two amplifiers 170, 175 for the two audio channels 115, 120.
  • the inventive method or the circuit arrangement based on the generation of a (control) signal on the basis of a current flowing through the coil of at least one headphone speaker electrical current. From a suitably generated signal, suitable features or signatures are extracted or changes in the electrical resistance or the impedance are detected in order to trigger predefinable actions on the terminal.
  • first embodiment of the circuit arrangement comprises the live lead 200 of a loudspeaker 205, in addition to the in Fig. 1 shown circuit, a shunt resistor 210.
  • a shunt resistor 210 in addition to the in Fig. 1 shown circuit, a shunt resistor 210.
  • V DRIVE 212 supplied by the named, not-shown, first amplifier, a shunt voltage V SHUNT 215 drops here via the shunt resistor 210.
  • the shunt voltage V SHUNT 215 galvanically decoupled by means of two capacitors 220 is supplied to an additional amplifier 225 and the correspondingly amplified voltage signal is finally supplied to an additional A / D converter 230, which in the present exemplary embodiment is provided as an auxiliary converter ("") provided specifically for the resistance detection of the loudspeaker 205.
  • Aux Audio A / D Converter ") is preferably capable of digitizing the entire bandwidth of the audio signal.
  • the described converter function can also be additionally implemented in the existing A / D converter 135.
  • an evaluation circuit or evaluation logic corresponding to the circuit components 210 to 230 may also be provided with a corresponding separate shunt resistor for the loudspeaker 235.
  • two separate A / D input channels may be present, taking advantage of e.g. In today's smartphones or sound cards installed there are often already several audio input channels are available, by means of which in a conventional manner analog audio signals can be converted by sampling ("sampling") into digital signals.
  • a second embodiment of the circuit arrangement according to the invention is shown, in which according to the Fig. 1 only a single A / D converter 135 is provided.
  • the voltage signals supplied by the speaker 205 and the microphone by means of a multiplexer, that is, in a known time division multiplex method, the single A / D converter 135 fed, ie in contrast to Fig. 2 without the requirement of an auxiliary converter 230 shown there.
  • a signal of the second loudspeaker can also be detected via a further shunt resistor and supplied to the single A / D converter.
  • a driver voltage V DRIVE 212 is provided, wherein one of the Fig. 2 corresponding shunt resistor 300 also drops a shunt voltage 303.
  • V DRIVE 212 is provided, wherein one of the Fig. 2 corresponding shunt resistor 300 also drops a shunt voltage 303.
  • MUX 4-to-2 multiplexer
  • the microphone signal can also be multiplexed in time using only the single amplifier 160 and the single A / D converter 135 be supplied.
  • the multiplexer 320 is electrically isolated from the second amplifier 160.
  • a separate or separate shunt resistor R SHUNT is also provided for the second loudspeaker 235, wherein the corresponding voltage signal would likewise be supplied to the A / D converter 135 by means of a multiplexer.
  • the multiplexer would have to be formed as a channel-wise extended 6-to-2 multiplexer instead of the mentioned 4-to-2 multiplexer 320.
  • a disadvantage of the second embodiment over the first embodiment is that the microphone 105 is at least temporarily unavailable during the course of detection of the resistance or the impedance of the loudspeakers 205, 235.
  • FFT Fast-Fourier transformation
  • the described approach with the Fourier transform requires that a time-dependent audio signal is present at the respective loudspeaker or loudspeaker pair and that the said determination of the headphone usage state can not be performed when at the Headphones no corresponding audio signal is present. Therefore, it can alternatively be provided in the method that only those frequency ranges or frequency lines ("frequency bins") resulting in the FFT are evaluated whose signal strength exceeds an empirically predeterminable threshold value.
  • a test signal is transmitted to one or both speakers, for example a non-audible to the user ultrasonic signal in the frequency range of about 20 kHz to the said operating or use state of the headset in such To be able to determine situations in the manner described.
  • a high-frequency signal can also be output in addition to an existing audio signal, since thereby the impedance change can be detected even faster and / or more precisely.
  • Fig. 4 is for a headphone speaker a typical, measured impedance curve
  • the curve 400 corresponds to the situation of an in-ear headphones arranged in the ear of a user and the curve 405 corresponds to the situation of the same in-ear headphones, but outside the ear. As can be seen, the two curves 400, 405 differ significantly both in terms of amplitude and frequency dependence.
  • Fig. 5 an embodiment of the method according to the invention is illustrated with reference to a flow chart.
  • step 500 a current value of the mentioned variable I SPK (t) is first detected.
  • step 505 the calculation of the impedance Z SPK (T) ensues therefrom on the basis of the ohmic law, the specifiable driver voltage V DRIVE (t) 510 being taken into account.
  • step 515 the said FFT transformation takes place, resulting in the size Z SPK (f).
  • the described evaluation method is trained and thus optimized for a specific, present type of headphone.
  • the evaluation method takes into account only relative impedance changes, so that the absolute values have no influence on the evaluation result.
  • the method described can be implemented in the form of a control program for an electronic control unit for controlling a terminal concerned here or in the form of one or more corresponding electronic control units (ECUs).
  • ECUs electronice control units

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Telephone Function (AREA)
EP17204827.4A 2016-12-13 2017-12-01 Procédé et agencement de circuit destinés au fonctionnement d'un casque d'écoute Withdrawn EP3337183A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102016224834.0A DE102016224834A1 (de) 2016-12-13 2016-12-13 Verfahren und Schaltungsanordnung zum Betrieb eines Kopfhörers

Publications (1)

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EP3337183A1 true EP3337183A1 (fr) 2018-06-20

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EP17204827.4A Withdrawn EP3337183A1 (fr) 2016-12-13 2017-12-01 Procédé et agencement de circuit destinés au fonctionnement d'un casque d'écoute

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EP (1) EP3337183A1 (fr)
DE (1) DE102016224834A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021089981A1 (fr) * 2019-11-04 2021-05-14 Cirrus Logic International Semiconductor Limited Procédés, appareil et systèmes pour processus biométriques

Citations (6)

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US20060029234A1 (en) * 2004-08-06 2006-02-09 Stewart Sargaison System and method for controlling states of a device
US20070297634A1 (en) * 2006-06-27 2007-12-27 Sony Ericsson Mobile Communications Ab Earphone system with usage detection
US20110116643A1 (en) * 2009-11-19 2011-05-19 Victor Tiscareno Electronic device and headset with speaker seal evaluation capabilities
US20140003616A1 (en) 2012-07-02 2014-01-02 Timothy M. Johnson Headset Impedance Detection
US20160150335A1 (en) * 2014-11-24 2016-05-26 Knowles Electronics, Llc Apparatus and method for detecting earphone removal and insertion
WO2016095987A1 (fr) * 2014-12-17 2016-06-23 Widex A/S Procédé de fonctionnement d'un système d'aide auditive, et système d'aide auditive

Family Cites Families (6)

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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
WO2006075275A1 (fr) * 2005-01-12 2006-07-20 Koninklijke Philips Electronics N.V. Systeme, procede et produit-programme informatique de divertissement audio
WO2009156522A2 (fr) * 2009-09-30 2009-12-30 Phonak Ag Écouteur
US9565490B2 (en) * 2011-05-02 2017-02-07 Apple Inc. Dual mode headphones and methods for constructing the same
US9161133B2 (en) * 2013-06-24 2015-10-13 Sony Corporation Crosstalk reduction in a headset
GB2600355B (en) * 2015-05-22 2022-07-27 Cirrus Logic Int Semiconductor Ltd Adaptive receiver

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060029234A1 (en) * 2004-08-06 2006-02-09 Stewart Sargaison System and method for controlling states of a device
US20070297634A1 (en) * 2006-06-27 2007-12-27 Sony Ericsson Mobile Communications Ab Earphone system with usage detection
US20110116643A1 (en) * 2009-11-19 2011-05-19 Victor Tiscareno Electronic device and headset with speaker seal evaluation capabilities
US20140003616A1 (en) 2012-07-02 2014-01-02 Timothy M. Johnson Headset Impedance Detection
US20160150335A1 (en) * 2014-11-24 2016-05-26 Knowles Electronics, Llc Apparatus and method for detecting earphone removal and insertion
WO2016095987A1 (fr) * 2014-12-17 2016-06-23 Widex A/S Procédé de fonctionnement d'un système d'aide auditive, et système d'aide auditive

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021089981A1 (fr) * 2019-11-04 2021-05-14 Cirrus Logic International Semiconductor Limited Procédés, appareil et systèmes pour processus biométriques
US11189300B2 (en) 2019-11-04 2021-11-30 Cirrus Logic, Inc. Methods, apparatus and systems for biometric processes
GB2604496A (en) * 2019-11-04 2022-09-07 Cirrus Logic Int Semiconductor Ltd Methods, apparatus and systems for biometric processes
US11615803B2 (en) 2019-11-04 2023-03-28 Cirrus Logic, Inc. Methods, apparatus and systems for biometric processes
GB2604496B (en) * 2019-11-04 2023-09-06 Cirrus Logic Int Semiconductor Ltd Methods, apparatus and systems for biometric processes

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