EP2733958B1 - Elektronische Vorrichtung mit Anpassung zur Erkennung eines Fahrzeug-Audiosystems - Google Patents

Elektronische Vorrichtung mit Anpassung zur Erkennung eines Fahrzeug-Audiosystems Download PDF

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Publication number
EP2733958B1
EP2733958B1 EP12192956.6A EP12192956A EP2733958B1 EP 2733958 B1 EP2733958 B1 EP 2733958B1 EP 12192956 A EP12192956 A EP 12192956A EP 2733958 B1 EP2733958 B1 EP 2733958B1
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Prior art keywords
electronic device
pulse
audio
audio system
coupled
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French (fr)
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EP2733958A1 (de
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Jens Kristian Poulsen
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BlackBerry Ltd
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BlackBerry Ltd
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    • 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

Definitions

  • Embodiments described herein relate to electronic devices, and in particular to electronic devices adapted to detect an audio system, particularly an audio system in a vehicle.
  • Portable electronic devices have gained widespread use and may provide a variety of functions including audio and video playback, telephonic, electronic text messaging and other application functions.
  • Portable electronic devices can include several types of devices, including cellular phones, smart phones, personal digital assistants (PDAs), music players, portable televisions or DVD players, tablets and laptop computers. Many of these devices are handheld, that is they are sized and shaped to be held or carried in one or more human hands.
  • PDAs personal digital assistants
  • music players portable televisions or DVD players
  • tablets and laptop computers Many of these devices are handheld, that is they are sized and shaped to be held or carried in one or more human hands.
  • Some portable electronic devices are used to provide audio output to an audio system, such as an audio system in a motor vehicle. For example, audio from music, movies or telephone calls may be routed from the electronic device to an audio system in a motor vehicle by connecting the electronic device to the audio system.
  • Some motor vehicles allow an electronic device's power supply, such as a rechargeable battery, to be charged during audio output.
  • a charging accessory such as a car charger may be used to charge a battery of an electronic device, to power the electronic device, or both, particularly while the electronic device is being used to play audio through the audio system.
  • WO2004/001552 relates to an identification system and method for recognizing a device as one of a plurality of different types of devices connected to at least one terminal of an information handling system includes supplying a test signal to a device in a test mode; measuring an electrical characteristic of the device in response to the test signal being applied to the device in the test mode; and matching a representation of the electrical characteristic of the device with representations of the electrical characteristics of the plurality of devices for recognizing the device connected to the terminal as one of the plurality of different devices.
  • electronic devices may be adapted to provide audio output (such as music, voice, and so on) through an audio system, such as an audio system in a vehicle.
  • audio output such as music, voice, and so on
  • an audio system such as an audio system in a vehicle.
  • an element when an element is "adapted to” or “configured to” perform a function, that element is suitable for performing the function, or is operable to perform the function, or is otherwise capable of carrying out that function, in some cases using a particular hardware configuration or software configuration, or some combination thereof.
  • Ground potential may be, but need not be, earth potential, and the discussion of ground does not necessarily imply a current path to earth.
  • ground currents through the portable electronic device and the audio jack connection tend to generate a differential voltage that is proportional to the charging current applied to the electronic device.
  • This differential voltage can create a significant amount of audio noise (also referred to as “ground noise” or “charging ground current noise”) that interferes with the quality of the audio output, and in some cases may render the audio output undecipherable.
  • audio noise also referred to as "ground noise” or “charging ground current noise”
  • the reduction in audio quality can be unsatisfactory and undesirable to a user, particularly when the user is trying to listen to music or participate in a telephone call through an audio system while charging the electronic device.
  • Some audio systems present another challenge.
  • portable electronic devices may have difficulty determining whether they are coupled to certain types of audio systems depending on the operating characteristics of those audio systems.
  • the impedance of the audio system falls outside of the range of impedances normally associated with audio accessories (e.g., headphones or headsets).
  • the impedance of many vehicle audio systems is significantly larger (e.g., around 47 kOhm) than the impedances of audio accessories, which often have an impedance of less than around 3 kOhm.
  • an electronic device can determine whether it is coupled to an audio accessory or to a vehicle audio system by measuring the observed impedance.
  • the electronic device can determine that it is coupled to an accessory. Conversely, if the electronic device observes an impedance outside of the particular range (e.g., greater than 3 kOhm), the electronic device can determine that it is coupled to an audio system.
  • a range associated with accessories e.g., between about 32 Ohm and 3 kOhm
  • the electronic device can determine that it is coupled to an audio system.
  • the electronic device may then take one or more actions based on this determination. For example, when the electronic device detects that it is coupled to an audio system, it can output a LINE OUT signal, bypassing local volume controls to allow audio volume to be controlled by the audio system (e.g., using a master volume control of the audio system).
  • the electronic device can control the outputted audio volume using the volume controls on the electronic device.
  • audio systems have impedance values that fall within the range of impedances commonly associated with headphones and other accessories.
  • some vehicles have audio systems with an impedance of between 1 kOhm and 3 kOhm, which is within the range normally associated with accessories (for example, in some cases between 32 Ohm and 3 kOhm).
  • the electronic device will be unable to distinguish an audio system from an accessory using impedance measurement.
  • the electronic device may therefore be unable to determine what type of device it has been coupled to, and thus be unable to automatically adjust the audio signal accordingly. This can lead to an undesirable user experience.
  • the electronic device when an electronic device is unable to determine whether it is coupled to an accessory or an audio system, the electronic device may not output a LINE OUT signal.
  • the volume controls on the electronic device may thus remain active even when the electronic device is coupled to an audio system. This can cause a reduced volume or quality (or both) of audio signals sent to a vehicle audio system, for example when the volume controls on the electronic device are set to a low value. As a result, the audio system will tend to output audio at a lower volume, which may be undesirable.
  • a user may try to compensate for the lower audio volume by increasing the master volume of the audio system (e.g., turning the master volume of the audio system to a higher value). However, this may introduce distortion or other undesirable audio effects, particularly at very high values.
  • an electronic device When an electronic device is coupled to an audio system and is being charged, the audio system often has a ground connection that is common between the charger and the audio jack. According to some embodiments, an electronic device may be adapted to detect the presence of a common ground and use this information to determine if the electronic device is coupled to an audio system.
  • the electronic device is adapted to generate a pulse on a ground return line of an audio jack.
  • a pulse can be applied to the SLEEVE, to the RING2 terminal if present or to both RING2 and SLEEVE in a TRRS jack.
  • the pulse may be a voltage pulse. In other cases, the pulse may be a current pulse.
  • a voltage pulse may be helpful to assess the impact on the audio output, since the magnitude of the voltage pulse can be compared to a full scale voltage pulse, which is typically 0.3V RMS or 1.2V RMS .
  • the magnitude of the pulse (measured in Volts) would tend to increase for loads with higher impedance, which may not be desirable.
  • one advantage of using a current pulse is that the measured voltage drop is normally linear with the load impedance.
  • the pulse may be shaped so as to generally be inaudible to a human user while the test is being conducted.
  • the pulse may be high pass filtered outside the human hearing range in order to be inaudible.
  • another way to make the detection inaudible is to tri-state the output amplifier while the ground detection pulse is being applied.
  • the current detection pulse may work quite well, since this would work with very low ground impedances and naturally limit the current to safe levels.
  • the electronic device can detect the presence or absence of a response signal that corresponds to the pulse. In particular, if there is a common ground between the audio jack and a charger, an increase in output current should be observed in response to the pulse (as compared to the case where there is no common ground).
  • Whether a response signal is received or not may convey some useful information. If a response signal is observed, this is evidence of a common ground between the audio jack and the charger, indicating that the electronic device is connected to an audio system, and not to an accessory. In other words, when a response signal is received, it may be determined that the electronic device is coupled to the audio system.
  • the charger and audio system do not share a common ground (e.g., as is the case on some BMW vehicles) there will normally be fewer problems with charging noise affecting the audio.
  • the initial volume settings may not be optimal.
  • the electronic device can take one or more actions based on whether it determines that it is coupled to an accessory or an audio system (e.g., the electronic device may output a signal with a LINE OUT level, etc.)
  • a system 100 that includes an electronic device 110 coupled to an audio system 120 (e.g., a car stereo in a motor vehicle), and a charging accessory 130 according to one embodiment.
  • the electronic device 110 and the audio system 120 may be coupled (or connected) physically, electronically, optically, communicatively, mechanically or any combination thereof, according to context.
  • components that are “coupled” are communicatively coupled and physically coupled as well.
  • components that are “communicatively coupled” are configured to communicate (that is, they are capable of communicating) in any fashion for any duration, such as by way of electric signals, optical signals, wireless signals, or any combination thereof.
  • the communication may be one-way or two-way communication.
  • Components are "physically coupled" when they are attached or connected or joined to one another, in any fashion, whether releasably or substantially permanently, so that physical activity of one component generally affects the other.
  • the physical attachment may be direct or by way of one or more intermediate elements.
  • Physical coupling may be related to communicative coupling, in that physical coupling may enable one or more current paths by which electrical signals may be transmitted or received.
  • the circuitry shown in Figure 1 may model actual electronic components as well as some physical effects of the interaction of components and parasitic system components such as wiring resistance.
  • the electronic device 110 has an audio jack 111 that includes an output line 112 and a ground return line 114.
  • the audio jack 111 is adapted to be coupled to the audio system 120 (e.g., using a TRS or TRRS connector, or another suitable connector) to send audio signals to the audio system 120.
  • the audio system 120 includes one or more speakers, for example speaker 122 as shown, which may be coupled to an amplifier 126. In some embodiments, the audio system 120 may include only one speaker. In other embodiments, the audio system 120 could include two or more speakers.
  • more than one amplifier 126 may be used to drive separate speakers (e.g., two amplifiers may be used for stereo systems with a left and right channel).
  • audio signals e.g., music, speech, etc.
  • audio system 120 receives audio signals from the electronic device 110 and sends audio signals to the audio system 120 via the output line 112.
  • audio signals are then amplified by the amplifier 126 and output as audible sound via the speaker 122.
  • the system 100 also includes the charging accessory 130.
  • the charging accessory 130 is coupled to a power source 128 (e.g., a DC power supply such as a car battery of a vehicle), which supplies electrical power to the charging accessory 130.
  • a power source 128 e.g., a DC power supply such as a car battery of a vehicle
  • the power source 128 may supply a charging current I c of around 0.5 amps to the charging accessory 130, at a voltage level of around 13.8 volts.
  • the charging accessory 130 supplies power to the electronic device 110 (e.g., +5 Volts DC at around 1 amp), indicated generally as current I E .
  • This power can power the electronic device 110, charge a battery (not shown) of the electronic device 110, or both.
  • the power source 128 may also supply power to the audio system 120, for example providing current I S , which in some cases may be around 2-3 amps at around 13.8 volts.
  • the electronic device 110, audio system 120, and charging accessory 130 share a common ground point or node (indicated generally as G).
  • various differential voltages within the system 100 can cause currents to flow (indicated generally as currents I 1 , I 2 , I 3 , and I 4 ). These currents I 1 , I 2 , I 3 , and I 4 may be sources of ground noise that interfere with audio quality.
  • the electronic device 110 may include a ground resistor Rx between the ground return line 114 and the ground point G.
  • the ground resistor Rx may help reduce the effects of ground noise, for example by reducing a ground current I 4 caused by the charging current I E .
  • the resistance value of the ground resistor Rx may be selected so as to reduce the impact of the ground current I 4 without significantly affecting the volume and quality of the outputted audio.
  • the ground resistor Rx should be included when needed to reduce noise, in which case the loads will always be fairly large, such that no significant reduction in headroom should occur.
  • ground resistor Rx may significantly degrade the crosstalk performance, unless ground sense after resistor Rx is used, as shown in Fig. 1 .
  • efficiency of the output may be very low if the ground resistor Rx was included for low impedance loads.
  • ground resistor Rx it may be beneficial to disconnect the ground resistor Rx, for example when compensating for ground noise is not desired (for instance when there is little or no ground noise because the electronic device 110 is not being charged) or when the resistance of the ground resistor Rx might significantly affect the audio quality (e.g., when the electronic device 110 is coupled to headphones or an audio system with low impedance and the headroom would significantly decrease).
  • the electronic device 110 may be adapted to detect whether the electronic device 110 is coupled to the audio system 120 or coupled to an accessory (e.g., accessory 150 as shown in Figure 2 ). In some cases, this may be done by monitoring the input impedance detected by the electronic device 110 through the audio jack 111.
  • an accessory e.g., accessory 150 as shown in Figure 2 .
  • the electronic device 110 may be unable to distinguish the audio system 120 from an accessory.
  • the electronic device 110 may be adapted to detect the presence of the audio system 120 using other techniques.
  • the electronic device 110 may be configured to detect a common ground (e.g., ground G) between the audio jack 111 and the charging accessory 130.
  • a common ground e.g., ground G
  • the electronic device 110 may be adapted to generate a pulse I P on the ground return line 114 of the audio jack 111.
  • the pulse I P can be applied to the SLEEVE of a TRS jack, or RING2 and SLEEVE in a TRRS jack.
  • the pulse I P could be generated by a pulse generator 140.
  • the pulse I P may be a voltage pulse, which could for example be generated by a voltage source. In some embodiments, the pulse I P may have a voltage value of between about -5 Volts to +5 Volts.
  • a voltage level in the range 50-100 mV could be used.
  • a larger voltage value should provide additional protection against noise. It might also be helpful to limit the output current (e.g., by finite output impedance, e.g. 75 Ohm) to avoid large over currents when the ground impedance is very low (e.g., below 1 Ohm).
  • the pulse I P may be a current pulse, which could, for example, be generated by a current source. In some embodiments, the pulse I P may have a current of between about 0.1 milliAmps to 300 milliAmps.
  • a current in the range 1-10 mA would be good to get a good signal-to-noise ratio and discriminate against noise.
  • the current pulse naturally limits the output current to safe levels.
  • the pulse could be spectrally shaped in order to be generally inaudible. Such a shaped pulse could be used to play audio while at the same time performing the measurements. This is beneficial in that audio would not be interrupted if the electronic device was connected to a charger after audio playback had begun.
  • one disadvantage is that the associated circuits might become more complicated to implement.
  • the electronic device 110 can then detect the presence or absence of a response signal I R corresponding to the pulse I P .
  • a response signal I R corresponding to the pulse I P .
  • a relatively large output current response signal I R should be observed in response to the pulse I P . (e.g., due to the effective "short" between the audio jack 111 and the ground G).
  • the response signal I R is monitored by a detector 142 on the electronic device 110 that is coupled to a charging ground line 131.
  • the voltage drop across the resistor Rx may simply be monitored as an indication on the current going through the open or closed loop as shown in Fig. 3 .
  • the electronic device 110 can determine that it is connected to the audio system 120, and not to an accessory.
  • the electronic device 110 can determine that it may not be connected to the audio system 120, but may instead be connected to an accessory 150.
  • the electronic device 110 may be coupled to an accessory 150 (e.g., a headset) and not the audio system 120 of Figure 1 .
  • the accessory 150 may include one or more speakers, for example speaker 152, and which may be coupled to an amplifier 156.
  • the accessory 150 may also include a microphone, one or more controls or buttons, and so on.
  • the accessory 150 is not coupled to a common ground G with the charging accessory 130.
  • the electronic device 110 is not coupled to the charging accessory 130 when the pulse I P is generated, then even if the electronic device 110 is coupled to the audio system 120, a response signal I R may not be observed by the electronic device 110 (e.g., if the charging ground return line 131 has been disconnected from the electronic device 110). In such cases, the audio system 120 may go undetected.
  • the electronic device 110 might make an additional measurement whenever a connection to a charging system is made, to determine the load that has been connected to the electronic device 110.
  • a determination may be made first that the electronic device 110 is coupled to a charging accessory 130 before the pulse I P is generated. This is generally because it is known that there will be no response signal I R unless the charger 130 closes the ground loop.
  • this can be handled by an event driven by the charging circuit inside the electronic device 110.
  • the charging circuit may I notify a driver handling the audio section that charging of the electronic device 110 has begun and thus a detection pulse I P can be sent.
  • the electronic device 110 may send a pulse I P even if the presence of the charging accessory 130 cannot be determined. However, subsequently when charging is detected, the electronic device 110 can generate a second (or third, or more) pulse I P . If this subsequent pulse I P indicates the presence of a common ground G, the electronic device 110 may more conclusively determine that it is coupled to an audio system 120.
  • the electronic device 110 can take one or more actions. For example, the electronic device 110 can attempt to correct for ground loop problems, bypass the local volume controls and output a LINE OUT signal (e.g., for an audio system 120), change the default equalizer settings, and so on.
  • an accessory e.g., accessory 150
  • an audio system e.g., audio system 120
  • the electronic device 110 may activate a ground switch 117 to selectively bypass the ground resistor Rx, for example using a bypass line 119. This may be particularly useful when the electronic device 110 detects that it is coupled to an accessory 150.
  • the ground switch 117 may have several positions, so that ground may be either connected to the SLEEVE, RING2 (or both) terminals based on measurements of the impedances of the accessory or audio system that has been connected to the electronic device 110. This can enable support for accessories with multiple different pin configurations (e.g., both TRS and TRRS).
  • the ground switch 117 may include a generator (e.g., a voltage, current or charge generator) positioned between the ground terminal and the ground resistor Rx to generate the excitation pulse I P .
  • a generator e.g., a voltage, current or charge generator
  • the pulse I P may also generate a jack response I Q that returns to the electronic device 110 via the output line 114.
  • the jack response I Q may also be used as a signal to determine whether the electronic device 110 is coupled to the audio system 120 or the accessory 150.
  • the jack response I Q may be quite different for the same pulse I P when the electronic device 110 is coupled to the audio system 120 as compared to when the electronic device 110 is coupled to the accessory 150.
  • the voltage drop over the ground resistor Rx may be quite small if the load has large impedance.
  • a larger value ground resistor Rx may be used to more accurately determine if the accessory has been connected.
  • a longer detection pulse or a higher detection voltage may be used in order to get a sufficiently good signal-to-noise ratio and determine whether an accessory has actually been connected.
  • the jack response current I Q may be measured by the detector 144 using a series resistor or other device.
  • the entire current of the pulse I P may return to the electronic device 110 as the jack response I Q the via the output line 114.
  • the electronic device 110 can determine that it is connected to the accessory 150.
  • the magnitude of the current of the jack response I Q will normally be quite small since there is effectively a short to ground.
  • magnitude of the current of the jack response I Q is substantially less the magnitude of the current of the pulse I P , then this may indicate that some of the current of the pulse I P has been siphoned off (e.g., and has gone to the charging accessory 130, for example) and that the electronic device 110 is coupled to an audio system.
  • monitoring the current of the jack response I Q may assist in determining whether the electronic device 110 is coupled to either the accessory 150 or the audio system 120., possibly even when the electronic device 110 is not being charged, although this is generally limited to the range of impedances where there are no known overlaps between the impedances of accessories and of audio system 120.
  • the jack response I Q may be used as a supplementary signal in combination with the response signal I R .
  • the electronic device 110 when the electronic device 110 detects that it is coupled to the audio system 120 and should be in LINE OUT mode, at least some of the controls of the electronic device 110 may be disabled or set to a particular advantageous level (e.g., volume set to near maximum or at maximum and additional boost may be enabled, etc.) and the gain on the electronic device 110 may be set at a particular level so as to provide a relatively clean audio signal (e.g., with minimal or at least reduced distortion) via the output line 112.
  • a particular advantageous level e.g., volume set to near maximum or at maximum and additional boost may be enabled, etc.
  • the electronic device 110 may set the default output line 112 volume to a different setting than the default headset volume setting (and which the user may be able to adjust).
  • the detection of an audio system 120 may result in specific audio settings (e.g., as selected and programmed by the user in a menu), which may provide for a particularly pleasing beginning to the listening experience.
  • a typical commercial LINE OUT level is around 316 mVrms full scale, while professional equipment may use larger amplitude such as 1.23V RMS . This means that when a user connects the electronic device 110 to a line in amplifier, the electronic device 110 should (in some embodiments) automatically default to a volume setting that corresponds to a maximum volume around this value (or at least a high volume).
  • SNR signal-to-noise
  • one or more techniques may be used to ensure that one or more of the pulse I P , the response signal I R and the jack response I Q are inaudible to a human user.
  • the pulse I P , the response signal I R and the jack response I Q may have frequencies and/or spectral properties selected so as to fall outside the range of audio that can normally be perceived by a human user.
  • the pulse is made inaudible by smoothly and slowly lowering the volume of the headphone amplifier 118, possibly even setting the output transistors of the amplifier 118 in tri-state condition during the measurement. After the measurement has been made, the volume may be increased again to a suitable level.
  • the volume should not be changed even when an audio system has been detected after a second detection pulse has been made after a charger has been identified as being connected. When this happens, the user may have already increased the volume on the audio system. Therefore, in this case the electronic device may choose to only enable a noise reduction circuit that includes a ground sense after the ground resistor Rx and not include the ground resistor Rx in the ground path.
  • Various embodiments may be beneficial in their adaptability to many different kinds of electronic devices, chargers and audio systems.
  • addition of space-consuming hardware or electrical pins can be avoided.

Claims (13)

  1. Verfahren zum Detektieren, ob eine tragbare elektronische Vorrichtung (110) an ein Audiosystem (120) gekoppelt ist, umfassend:
    Erzeugen eines Pulses (Ip) an einer Masserücklaufleitung (114) der elektronischen Vorrichtung (110);
    Beobachten, ob ein Antwortsignal (Ir) von der elektronischen Vorrichtung entsprechend dem Puls empfangen wurde, wobei das Antwortsignal (Ir) ein Ausgabestrom ist, der an einer Lademasseleitung (131) der elektronischen Vorrichtung (110) beobachtet wird; und
    falls das Antwortsignal (Ir) empfangen wird, dann Bestimmen, dass die elektronische Vorrichtung (110) an das Audiosystem (120) gekoppelt ist.
  2. Verfahren nach Anspruch 1, ferner umfassend ein Bestimmen, dass die elektronische Vorrichtung (110) nicht an das Audiosystem (120) gekoppelt ist, falls kein Antwortsignal (Ir) erhalten wird.
  3. Verfahren nach einem der vorstehenden Ansprüche, wobei der Puls (Ip) durch einen Pulsgenerator (140) erzeugt wird, der an die Masserücklaufleitung (114) der elektronischen Vorrichtung (110) gekoppelt ist.
  4. Verfahren nach einem der vorstehenden Ansprüche, wobei das Antwortsignal (Ir) von einem Detektor (142) beobachtet wird, der an die Lademasseleitung (131) gekoppelt ist.
  5. Verfahren nach einem der vorstehenden Ansprüche, ferner umfassend ein Detektieren, dass die elektronische Vorrichtung (110) an eine Ladeausrüstung (130) gekoppelt wird, bevor der Puls (Ip) erzeugt wird.
  6. Verfahren nach einem der vorstehenden Ansprüche, ferner umfassen ein Detektieren, dass die elektronische Vorrichtung (110) geladen wird, und dann das Erzeugen eines darauffolgenden Pulses.
  7. Verfahren nach einem der vorstehenden Ansprüche, ferner umfassend, vor dem Erzeugen des Pulses (Ip), Messen einer beobachteten Impedanz an einer Audiobuchse (111) der elektronischen Vorrichtung (110), und Erzeugen des Pulses nur, falls die beobachtete Impedanz innerhalb eines bestimmten Impendanzbereichs liegt.
  8. Elektronische Vorrichtung (110), die detektieren kann, ob sie an ein Audiosystem (120) gekoppelt ist, aufweisend:
    einen Pulsgenerator (140), der ausgebildet ist einen Puls (Ip) an einer Masserücklaufleitung (114) der elektronischen Vorrichtung (110) zu erzeugen; und
    einen Detektor (142), der ausgebildet ist, zu Beobachten, ob ein Antwortsignal (Ir) von der elektronischen Vorrichtung entsprechend dem Puls empfangen wird, wobei das Antwortsignal (Ir) ein Ausgabestrom ist, der an einer Lademasseleitung (131) der elektronischen Vorrichtung (110) beobachtet wird;
    wobei, falls das Antwortsignal empfangen wurde, ist die elektronische Vorrichtung (110) an das Audiosystem (120) gekoppelt ist.
  9. Elektronische Vorrichtung (110) nach Anspruch 8, wobei die elektronische Vorrichtung (110) bestimmt, dass sie nicht an das Audiosystem (120) gekoppelt ist, falls kein Antwortsignal (Ir) empfangen wurde.
  10. Elektronische Vorrichtung (110) nach einem oder mehr der Ansprüche 8 oder 9, wobei der Detektor (142) an die Lademasseleitung (131) gekoppelt ist.
  11. Elektronische Vorrichtung (110) nach einem oder mehr der Ansprüche 8 bis 11, wobei die elektronische Vorrichtung (110) detektiert, dass sie an eine Ladeausrüstung (130) gekoppelt ist, bevor der Puls (Ip) erzeugt wird.
  12. Elektronische Vorrichtung (110) nach einem oder mehr der Ansprüche 8 bis 12, wobei wenn die elektronische Vorrichtung (110) detektiert, dass sie geladen wird, sie dann einen nachfolgenden Puls erzeugt.
  13. Elektronische Vorrichtung (110) nach einem oder mehr der Ansprüche 8 bis 13, wobei, vor dem Erzeugen des Pulses (Ip), die elektrische Vorrichtung (110) eine beobachtete Impedanz an einer Audiobuchse (111) der elektronischen Vorrichtung (110) misst, und den Puls (Ip) nur erzeugt, falls die beobachtete Impedanz innerhalb eines bestimmten Impendanzbereichs liegt.
EP12192956.6A 2012-11-16 2012-11-16 Elektronische Vorrichtung mit Anpassung zur Erkennung eines Fahrzeug-Audiosystems Active EP2733958B1 (de)

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EP2733958B1 true EP2733958B1 (de) 2016-07-13

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US7890284B2 (en) * 2002-06-24 2011-02-15 Analog Devices, Inc. Identification system and method for recognizing any one of a number of different types of devices
JP5290944B2 (ja) * 2009-11-27 2013-09-18 ラピスセミコンダクタ株式会社 プラグの種別を判定する方法及びプラグ判定回路
FR2954510B1 (fr) * 2009-12-18 2012-06-08 Sagem Comm Appareil comprenant des moyens de connexion a un ou des haut parleurs externes ainsi que des moyens de detection d'une telle connexion
US8629580B2 (en) * 2011-02-09 2014-01-14 Apple Inc. Audio accessory type detection and connector pin signal assignment

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