EP2514219B1 - Gerät mit vorrichtung für den anschluss von einem oder mehreren aussenlautsprechern sowie mit vorrichtung zur erkennung eines derartigen anschlusses - Google Patents

Gerät mit vorrichtung für den anschluss von einem oder mehreren aussenlautsprechern sowie mit vorrichtung zur erkennung eines derartigen anschlusses Download PDF

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Publication number
EP2514219B1
EP2514219B1 EP20100790614 EP10790614A EP2514219B1 EP 2514219 B1 EP2514219 B1 EP 2514219B1 EP 20100790614 EP20100790614 EP 20100790614 EP 10790614 A EP10790614 A EP 10790614A EP 2514219 B1 EP2514219 B1 EP 2514219B1
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EP
European Patent Office
Prior art keywords
external
appliance
frequency
loudspeakers
terminals
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Application number
EP20100790614
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English (en)
French (fr)
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EP2514219A1 (de
Inventor
Gilles Bourgoin
Patrice Pelin
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Sagemcom Broadband SAS
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Sagemcom Broadband SAS
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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
    • H04R2205/00—Details of stereophonic arrangements covered by H04R5/00 but not provided for in any of its subgroups
    • H04R2205/021—Aspects relating to docking-station type assemblies to obtain an acoustical effect, e.g. the type of connection to external loudspeakers or housings, frequency improvement
    • 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
    • H04R2420/05—Detection of connection of 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
    • H04R2430/00—Signal processing covered by H04R, not provided for in its groups
    • H04R2430/01—Aspects of volume control, not necessarily automatic, in sound systems

Definitions

  • the invention relates to an apparatus or terminal such as an audio playback device which is intended to be connected to one or more external loudspeakers for broadcasting via these external loudspeakers an audio source.
  • Many portable devices can receive and listen to a wide variety of audio sources from various sources: radio, telephony, television, recorded music or others.
  • the user simply engages the portable device in the docking station, these two elements being provided with additional electrical connectors, which automatically causes playback of the audio source via the additional speakers fitted to the docking station.
  • the object of the invention is to propose a solution for reliably and inexpensively detecting the connection of external speakers to a device such as a portable device.
  • the subject of the invention is an audio apparatus as defined in claim 1.
  • the invention also relates to an apparatus as defined above, in which the means for detecting a current flowing between the external terminals comprise an inductance connected between an amplifier of the apparatus and one of the external terminals, as well as means for measuring the voltage across this inductor.
  • the invention also relates to an apparatus as defined above, comprising several audio outputs, as well as detection means associated with each of these audio outputs.
  • the invention also relates to a system comprising an apparatus as defined above, as well as external loudspeakers intended to be connected to this apparatus via the external terminals, and wherein the apparatus comprises means for, in case of detection of external speakers, reduce the signal gain in the frequency band common to the internal speakers and external speakers.
  • the invention also relates to a system comprising an apparatus as defined above, as well as external speakers intended to be connected to this apparatus via the external terminals of this apparatus, and wherein each external speaker comprises a capacitor connecting its terminals. connection.
  • the idea underlying the invention is to integrate in the amplified electrical signal which is established at the external terminals and which is representative of the audio source read by the apparatus, a component having a so-called detection frequency which is greater than or equal to less than the audible frequencies, and to determine that loudspeakers are connected when a current having the frequency corresponding to the detection frequency, or more generally a frequency situated outside the audible frequency spectrum, is established between the terminals external.
  • the system according to the invention which is schematically represented in figure 1 comprises a mobile reading terminal apparatus, identified by 1, associated with a fixed docking station marked by 2 in which the mobile device is engaged.
  • the apparatus 1 comprises a reading unit 3 of an audio source, delivering two electrical signals, respectively on two channels 4g and 4d corresponding here to the right and left channels of a stereo source.
  • the line 4g comprises an equalizer 6g receiving as input the left signal from the reader 3, and delivering the equalized signal to an amplifier 7g of the left channel.
  • the amplified signal is applied on the one hand to a left speaker 8g which is integrated in the device 1, and on the other hand to an external connector 9g by which the device can not be connected to a left external speaker 11g that equips here the docking station 2.
  • a speaker detection device for the left channel, marked 13g is interposed between the amplifier 7g and the external connector 9g.
  • the right channel 4d is provided with an equalizer 6d, an amplifier 7d, a loudspeaker 8d, and a detection device 13d interposed between the amplifier 7d and the external connector 9d of Right Lane.
  • the left external speaker 11g is electrically connected to the external connector 9g of the left channel via a left connector 12g equipping the docking station, and similarly, the right external speaker 11d is electrically connected to the right external connector 9d by a right connector 12d also equipping the docking station.
  • the apparatus 1 also comprises a microprocessor or microcontroller 14, which communicates with the detection devices 13g and 13d, with the amplifiers 7g and 7d, and with the equalizers 6g and 6d, to control them.
  • a microprocessor or microcontroller 14 which communicates with the detection devices 13g and 13d, with the amplifiers 7g and 7d, and with the equalizers 6g and 6d, to control them.
  • Each amplifier 7g and 7d is a class D amplifier. Such an amplifier delivers a square amplitude fixed output signal at a so-called sampling frequency much higher than the frequencies of the audible spectrum. The amplifier modulates the duty cycle of this square signal as a function of the amplitude of the sound source signal being read.
  • the duty cycle is high when the signal from the audio source is high, and this duty cycle is low when the signal from the audio source is low.
  • the sampling frequency of the amplifier is much higher than the audible frequencies, the value of the output signal at a given instant corresponds to the value of the duty cycle at this time.
  • the output signals of the left channel and the right channel each have a component whose frequency corresponds to the sampling frequency which is higher than the audible frequencies, and which here constitutes a so-called detection frequency.
  • the electrical signal delivered by the amplifier 7g on the left channel 4g gives rise to an electric current of the same pace as this signal, this current flowing between the 9d connector terminals being injected into the speaker 11 g.
  • the amplifiers of the apparatus are not class D, it is possible to inject into the output signal a component having a frequency situated outside the audible frequency spectrum, for example by means of a circuit or an additional electronic component connected to the output terminals of the device.
  • the current injected into the speaker 11g when connected has a component whose frequency is the detection frequency .
  • the detection of the effective connection of the loudspeaker 11g is provided by the detection device 13g which determines whether an electric current having a component whose frequency is close to the detection frequency, flows or not between the terminals of the connector 9g. It is the same for the detection of the effective connection of the speaker 11d by the detection device 13d.
  • the detection device is arranged to identify the existence of current components having frequencies outside the audible spectrum.
  • This device can for example simply correspond to a high pass type filter to identify the currents having higher frequencies to the audible spectrum.
  • the detection device 13g mainly comprises an inductor L1, an operational amplifier AO, a diode D and a capacitor identified by C.
  • the left channel 4g comprises a first line 9g 'and a second line 9g "each connected to a corresponding output terminal of the connector 9g.
  • the inductance L1 is interposed between two consecutive portions of the line 9g ", that is to say that it is connected in series in this line.
  • the operational amplifier AO has its two inputs connected across the inductance L1, and its output connected to an output line 17g, through the diode D which is oriented to allow the current flow only in the outgoing direction of the operational amplifier.
  • the capacitor C is connected on the one hand at the output of the diode D, and secondly at the line 9g '.
  • the operational amplifier AO amplifies the voltage across the inductive coil L1, which is for example tuned to the detection frequency, and the diode D associated with the capacitor C form a detection circuit whose output 17g is directed towards the microcontroller 14
  • the signal delivered on the output line 17g is thus representative of the connected or unconnected state of a loudspeaker on the external connector 9g.
  • This signal has a large amplitude when an external speaker is connected to the connector 9g, and a substantially zero amplitude if no speaker is connected. Thanks to the diode D, the detection signal of the line 17g has only positive values.
  • the left external speaker 11g comprises a transducer 16g connected to the terminals of the connector 12g, and it is complemented by an additional capacitor C1 connected between the terminals of the connector 12g.
  • the values of the inductance L1 and of the capacitor C1 are chosen so as not to modify the bandwidth of the audio signal, since in practice the inductance L1 is worth a few microphones Henri, and the capacitance of the capacitor C1 which is optional is some nano Farad.
  • the maximum frequency of the audible spectrum is 20 kHz, while the sampling frequency of the amplifier 7 g is 500 kHz.
  • the output 17g of the detection device 13g is connected to the processor 14, as illustrated schematically on the figure 1 , and likewise with regard to the output of the detection device 13d.
  • the microprocessor 14 is connected to the amplifiers 7g and 7d as well as to the equalizers 6g and 6d, so as to control them according to whether external speakers are connected or not.
  • the microprocessor 14 drives the amplifiers 7g and 7d to substantially reduce the amplification gain applied to the audio source. This command avoids an increase in the sound volume of the audio source output, due to the connection of the external speakers, and thus improves the ergonomics of the system since the user does not have to perform this volume correction manually .
  • the reading apparatus 1 and the docking station 2 are associated with each other, and the detection of the connection of the external loudspeakers 11g and 11d is used to adapt the equalization applied to the audio source when the external speakers are connected.
  • the internal speakers and the external speakers have overlapping bandwidths.
  • the internal speakers have a bandwidth that ranges from 250 Hz to 16 kHz
  • the external speakers fitted to the docking station have a bandwidth ranging from 31 Hz to 500 kHz, the station of home then constituting a subwoofer.
  • the device 1 may be provided with an interface, for example graphical, allowing it to adjust the equalization gains by frequency band.
  • External devices are then displayed in a way that allows the user to adjust them according to his taste.
  • the microprocessor 14 corrects the existing equalization so as to compensate for the fact that the bandwidths of the internal and external loudspeakers overlap. Specifically, the microprocessor 14 then controls the equalizers 6g and 6d to lower by 2 dB the gains of frequencies 250 Hz to 500 Hz which correspond to the area of overlap bandwidth of the internal and external speakers.
  • the detection of the actual connection of external speakers can be exploited to adapt the signal processing parameters to the typology of the speakers through which the sound source is broadcast, or to inform the user of faults. connection.
  • the detection is advantageously carried out on each output of the apparatus intended to be connected to a loudspeaker, which notably makes it possible to inform the user, via the interface of the reading apparatus, of a defect of connection with regard to the external speakers.
  • the invention is applied to a mobile device designed to cooperate with a fixed station, but the invention applies to other types of devices. It applies in a general way to the devices of audio reproduction and possibly video portable type such as phones, electronic organizers, laptops, which are associated with fixed stations to improve the quality of sound reproduction.
  • the invention also applies to audio reproduction devices such as televisions, DVD players or the like which have one or more audio outputs to loudspeakers.
  • the invention also applies to systems in which the audio reproduction device for which the connection to the speakers is difficult to access, such as for example in a motor vehicle or in an auditorium, where the invention makes it possible to detect the breaking of the connection to a speaker.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Stereophonic System (AREA)

Claims (6)

  1. Audiogerät (1) umfassend mindestens einen Audioausgang (9g, 9d) der mindestens zwei externe Anschlüsse umfasst, die dazu bestimmt sind, mit einem oder mehreren externen Lautsprechern (11g, 11d) verbunden zu werden, um über jeden externen Lautsprecher (11g, 11d) ein akustisches Signal zu senden, das einer durch dieses Gerät (1) verstärkten Audioquelle entspricht, wobei dieses Gerät Mittel umfasst, um zwischen den externen Anschlüssen ein elektrisches Signal herzustellen, das repräsentativ für die Audioquelle ist, um in jeden angeschlossenen externen Lautsprecher (11g, 11d) einen entsprechenden elektrischen Strom einzuspeisen, wobei dieses Gerät Mittel umfasst, um in das zwischen seinen externen Anschlüssen hergestellte elektrische Signal eine elektrische Signalkomponente mit einer Frequenz zu integrieren, die als Detektionsfrequenz bezeichnet wird und die sich außerhalb des Spektrums der hörbaren Frequenzen befindet, sowie Mittel (13g, 13d) zum Erfassen eines elektrischen Stroms, der zwischen den externen Anschlüssen fließt und eine Komponente aufweist, deren Frequenz der Detektionsfrequenz entspricht, dadurch gekennzeichnet, dass das Gerät einen Verstärker (7g, 7d) der Klasse D umfasst, um die Schallquelle zu verstärken, und in dem die elektrische Signalkomponente, die als Frequenz die Detektionsfrequenz hat, direkt durch den Verstärker (7g, 7d) der Klasse D erzeugt wird, wobei die Detektionsfrequenz der Abtastfrequenz des Verstärkers der Klassen D entspricht.
  2. Gerät nach Anspruch 1, bei dem die Erfassungsmittel eines zwischen den externen Anschlüssen fließenden Stroms eine Induktivität (L1) umfassen, die auf die Detektionsfrequenz abgestimmt ist, indem sie zwischen einen Verstärker (7g, 7d) des Geräts (1) und einen der externen Anschlüsse geschaltet ist, sowie Mittel (AO, D, C) zum Messen der Spannung an den Anschlüssen dieser Induktivität (L1) umfassen.
  3. Gerät nach Anspruch 1 oder 2, umfassend mehrere Audioausgänge (9g, 9d) sowie Erfassungsmittel, die mit jedem dieser Audioausgänge verbunden sind.
  4. Gerät nach einem der vorhergehenden Ansprüche, umfassend interne Lautsprecher (8g, 8d), die durch dasselbe elektrische Signal wie die externen Anschlüsse gespeist sind, sowie Mittel zur Senkung der Amplitude dieses elektrischen Signals bei einer Erfassung der mit den externen Anschlüssen verbundenen externen Lautsprecher (11g, 11d).
  5. System, umfassend ein Gerät (1) gemäß einem der Ansprüche 1 bis 4 sowie externe Lautsprecher (8g, 8d), die dazu bestimmt sind, über die externen Anschlüsse mit diesem Gerät verbunden zu werden, und wobei das Gerät Mittel umfasst, um im Falle einer Erfassung der externen Lautsprecher (11g, 11d) die Signalverstärkung im gemeinsamen Frequenzband an die internen Lautsprecher (8g, 8d) und an die externen Lautsprecher (11g, 11d) zu reduzieren.
  6. System, umfassend ein Gerät (1) gemäß einem der Ansprüche 1 bis 4 sowie externe Lautsprecher (8g, 8d), die dazu bestimmt sind, über die externen Anschlüsse mit diesem Gerät verbunden zu werden, und wobei jeder externe Lautsprecher (11g, 11d) einen Kondensator umfasst, der seine Anschlussklemmen verbindet.
EP20100790614 2009-12-18 2010-11-24 Gerät mit vorrichtung für den anschluss von einem oder mehreren aussenlautsprechern sowie mit vorrichtung zur erkennung eines derartigen anschlusses Active EP2514219B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0906152A FR2954510B1 (fr) 2009-12-18 2009-12-18 Appareil comprenant des moyens de connexion a un ou des haut parleurs externes ainsi que des moyens de detection d'une telle connexion
PCT/EP2010/007106 WO2011072795A1 (fr) 2009-12-18 2010-11-24 Appareil comprenant des moyens de connexion à un ou des haut parleurs externes ainsi que des moyens de détection d'une telle connexion

Publications (2)

Publication Number Publication Date
EP2514219A1 EP2514219A1 (de) 2012-10-24
EP2514219B1 true EP2514219B1 (de) 2013-08-07

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EP20100790614 Active EP2514219B1 (de) 2009-12-18 2010-11-24 Gerät mit vorrichtung für den anschluss von einem oder mehreren aussenlautsprechern sowie mit vorrichtung zur erkennung eines derartigen anschlusses

Country Status (5)

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US (1) US9131306B2 (de)
EP (1) EP2514219B1 (de)
CN (1) CN102656904B (de)
FR (1) FR2954510B1 (de)
WO (1) WO2011072795A1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2733958B1 (de) * 2012-11-16 2016-07-13 BlackBerry Limited Elektronische Vorrichtung mit Anpassung zur Erkennung eines Fahrzeug-Audiosystems
US9338536B2 (en) * 2013-05-07 2016-05-10 Bose Corporation Modular headrest-based audio system
SE1451466A1 (sv) * 2014-03-26 2015-09-27 Sound Dimension Ab Device for reproducing sound
JP2017028397A (ja) * 2015-07-17 2017-02-02 株式会社東芝 電子機器及びその制御方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5450624A (en) * 1993-01-07 1995-09-12 Ford Motor Company Method and apparatus for diagnosing amp to speaker connections
JP3908434B2 (ja) * 2000-03-06 2007-04-25 パイオニア株式会社 スピーカを備えた情報機器
US6870934B2 (en) * 2002-07-15 2005-03-22 Visteon Global Technologies, Inc. Audio loudspeaker detection using back-EMF sensing
US20050175195A1 (en) * 2004-02-10 2005-08-11 Cheney Maynard C.Jr. Detecting connectivity of a speaker
JP2009171068A (ja) * 2008-01-11 2009-07-30 Alpine Electronics Inc スピーカ接続状態検出方法

Also Published As

Publication number Publication date
US20120250894A1 (en) 2012-10-04
CN102656904A (zh) 2012-09-05
FR2954510A1 (fr) 2011-06-24
FR2954510B1 (fr) 2012-06-08
US9131306B2 (en) 2015-09-08
CN102656904B (zh) 2015-09-09
EP2514219A1 (de) 2012-10-24
WO2011072795A1 (fr) 2011-06-23

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