EP2770748B1 - Appareil, systèmes et procédés pour détecter l'insertion ou le retrait d'un accessoire audio à partir d'un dispositif électronique - Google Patents

Appareil, systèmes et procédés pour détecter l'insertion ou le retrait d'un accessoire audio à partir d'un dispositif électronique Download PDF

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Publication number
EP2770748B1
EP2770748B1 EP13156738.0A EP13156738A EP2770748B1 EP 2770748 B1 EP2770748 B1 EP 2770748B1 EP 13156738 A EP13156738 A EP 13156738A EP 2770748 B1 EP2770748 B1 EP 2770748B1
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EP
European Patent Office
Prior art keywords
audio
detection
electronic device
accessory
terminals
Prior art date
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Application number
EP13156738.0A
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German (de)
English (en)
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EP2770748A1 (fr
Inventor
Jens Kristian Poulsen
Yong Zhang
Per Magnus Fredrik Hansson
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BlackBerry Ltd
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BlackBerry Ltd
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Priority to EP13156738.0A priority Critical patent/EP2770748B1/fr
Publication of EP2770748A1 publication Critical patent/EP2770748A1/fr
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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
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/1041—Mechanical or electronic switches, or control elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/66—Structural association with built-in electrical component
    • H01R13/70—Structural association with built-in electrical component with built-in switch
    • H01R13/703—Structural association with built-in electrical component with built-in switch operated by engagement or disengagement of coupling parts, e.g. dual-continuity coupling part
    • H01R13/7031—Shorting, shunting or bussing of different terminals interrupted or effected on engagement of coupling part, e.g. for ESD protection, line continuity
    • H01R13/7032—Shorting, shunting or bussing of different terminals interrupted or effected on engagement of coupling part, e.g. for ESD protection, line continuity making use of a separate bridging element directly cooperating with the terminals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R2107/00—Four or more poles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R24/00—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure
    • H01R24/58—Contacts spaced along longitudinal axis of engagement
    • 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
    • H04R2420/00—Details of connection covered by H04R, not provided for in its groups
    • H04R2420/09—Applications of special connectors, e.g. USB, XLR, in loudspeakers, microphones or headphones
    • 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 herein relate to electronic devices and in particular to apparatus, systems and methods for detecting the insertion or removal (or both) of an audio accessory, such as a headset, from an electronic device.
  • an audio accessory such as a headset
  • Electronic devices including portable electronic devices like smart phones and tablets, have gained widespread use and may provide a variety of functions including telephonic services, text messaging, playing media such as music and movies, and so on.
  • Audio accessories may receive from the electronic device, or transmit to the electronic device (or both) audio information, which may include any signals related to audio, such as voice or music or other sounds, and any instructions or messages or control codes or other data related to the audio.
  • some electronic devices have audio jacks that are sized and shaped to receive a mating audio plug from a headset audio accessory. A user connects the headset audio accessory to the electronic device by inserting the audio plug on the headset into the audio jack on the electronic device. Once connected, audio can be output to the user by the audio accessory (e.g., via speakers on the audio accessory).
  • audio accessories may incorporate a microphone to allow audio signals (e.g., speech) to be sent from the audio accessory to the electronic device. This may allow the user to make phone calls using the audio accessory, record voice memos, control the electronic device using voice commands, and so on.
  • audio signals e.g., speech
  • an audio accessory may include one or more buttons or other input devices to control the electronic device.
  • Patent document US 2009/296952 describes methods, apparatus, systems and means for determining a type of microphone button of a headset plugged into a device jack.
  • a type of microphone button or headset is determined from a plurality of button or headset types based on whether or not a headset plug is detected in a headset jack of a device and whether or not a signal received at a first contact of the headset jack includes overcurrent or an undercurrent.
  • the behavior of the device may be controlled based on the type of microphone button or headset determined.
  • a predetermined circuit, a predetermined algorithm, or a predetermined process may be selected to signal process the audio signal of the microphone, based on the type of microphone button or headset.
  • Patent document US 2012/081102 describes circuits, methods, and apparatus that provide an audio receptacle that can detect the presence of an audio jack without using mechanical switches or other such mechanical mechanisms.
  • One example provides an audio receptacle having two contacts that may be electrically connected when an audio jack is inserted. When no audio jack is inserted into the audio receptacle, the two ground contacts may not be connected.
  • the resulting closed circuit When an audio jack is inserted into the audio receptacle, the resulting closed circuit may be detected and used to activate or otherwise tum on one or more audio circuits in or associated with the audio receptacle. Conversely, when no audio jack is inserted, the resulting open circuit may be detected and used to deactivate or otherwise turn off or reduce power in one or more audio circuits in or associated with the audio receptacle.
  • Patent document US 2008/164994 describes a single prong, multiple signal conducting plug and plug detection circuitry.
  • the plug may be electrically coupled to a stereo headset including a microphone.
  • the plug may include four signal conducting regions arranged in a predetermined order along the length of the prong.
  • Detection circuitry may be operative to determine whether a microphone type of plug (e.g., a four region plug including a microphone region and two audio regions, or a three region plug including microphone region and only one audio region) or a non-microphone type of plug (e.g., stereo plug) is inserted into the jack of an electronic device (e.g., mobile phone). Detection circuitry may also detect user activated functions performed in response to user activation of one or more switches included with the headset. For example, the headset may include a single switch for performing a function with respect to a microphone (e.g., end-call function).
  • Patent document US 2009/179768 describes electronic devices and accessories such as headsets for electronic devices.
  • a microphone may be included in an accessory to capture sound for an associated electronic device. Buttons and other user interfaces may be included in the accessories.
  • An accessory may have an audio plug that connects to a mating audio jack in an electronic device, thereby establishing a wired communications link between the accessory and the electronic device.
  • the electronic device may include power supply circuitry for applying bias voltages to the accessory. The bias voltages may bias a microphone and may adjust settings in the accessory such as settings related to operating modes. User input information may be conveyed between the accessory and the electronic device using ultrasonic tone transmission. The electronic device may also gather input from the accessory using a voltage detector coupled to lines in the communications path.
  • some embodiments as described herein may be implemented on electronic devices, which may include a wide range of portable electronic devices that can be worn or carried by a human user, such as mobile phones, smart phones, personal digital assistants (PDAs), notebooks, laptops, digital audio/video players, digital audio/video recorders, tablet computers, and so on.
  • the devices may be handheld, that is, sized and shaped to be held and carried in a human hand (although some handheld devices may be attached to clothing or otherwise worn during normal use).
  • the electronic devices may also include devices that are normally not worn or carried by a human user, for example a desktop computer, a stereo system, a vehicle audio system, and so on.
  • One aspect as described herein is directed to an electronic device as detailed in claim 1.
  • a portable smart phone may generally have a smaller display and less memory capacity than a desktop computer, which may have a larger display and more memory.
  • the electronic device may be a portable electronic device, such as a smart phone with communications capabilities (e.g., voice, data, or both), over a data connection (e.g., a cellular network), and which is adapted to cooperate with an audio accessory (e.g., headphones).
  • a portable electronic device such as a smart phone with communications capabilities (e.g., voice, data, or both), over a data connection (e.g., a cellular network), and which is adapted to cooperate with an audio accessory (e.g., headphones).
  • elements may be described as "adapted to" perform or "adapted for" performing one or more functions.
  • an element that is adapted to perform a function is suitable for performing the function, or is configured to perform the function, or is operable to perform the function, or is otherwise capable of performing the function.
  • an audio accessory when an audio accessory is removed from the electronic device it may be desirable to terminate audio output through the audio jack, activate a speaker on the electronic device (e.g., for receiver or speakerphone mode), or take some other action.
  • a speaker on the electronic device e.g., for receiver or speakerphone mode
  • the detection pin senses the insertion or removal of an audio accessory via a moveable switch.
  • the detection pin has at least one movable element, and the insertion or removal of the audio plug causes that element to move to either open or close an electrical circuit (depending on the particular configuration). This opening and closing is interpreted (e.g., by a processor on the electronic device) as either an insertion event or a removal event depending on the particular configuration.
  • the movable element in a "normally open” configuration, the movable element is normally not in electrical contact with another terminal and the electrical circuit is open. However, when the audio accessory is inserted into the electronic device, the movable element will move into electrical contact with another terminal, closing the electrical circuit. This will be registered by the electronic device as an insertion event. Similarly, when the audio accessory is removed, the electrical connection between the terminals will be broken, registering the removal event.
  • a first and second terminal may be in electrical contact until the audio accessory is inserted into the audio jack.
  • the action of inserting the audio accessory will break this electrical contact, opening the circuit, which will be registered as an insertion event.
  • the terminals will return to being in electrical contact, closing the circuit and registering a removal event.
  • At least some embodiments herein are directed at improved techniques for detecting whether an audio accessory is coupled to an electronic device, particularly for detecting the insertion or removal (or both) of an audio accessory.
  • an audio jack is configured with at least two detection terminals, which may be located at or near the tip-end of the socket of the audio jack.
  • the detection terminals are spaced apart, and in some embodiments may be on opposite sides of the socket.
  • the detection terminals are positioned so when an audio accessory is coupled to the electronic device, the audio plug of the accessory will be in electrical contact with both terminals. More particularly, the same electrical contact on the audio plug (e.g., namely either the tip, ring or sleeve) will be in electrical contact with both terminals. That electrical contact thus provides a short circuit between the detection terminals.
  • a shorting refers to the creation or presence of a short circuit. Generally speaking, shorting refers to two nodes being electrically connected such that their voltages are substantially equal to one another.
  • Shorting includes not only strict shorting, in which the two nodes are electrically connected by being brought in directly in electrical and physical contact with one another, but also substantial shorting, in which one or more intermediate elements (typically having negligible impedance) bridges the two nodes.
  • the detection terminals can be monitored, and when a short circuit (or simply a short) between the detection terminals exists, the short can be detected (in some cases using one or more detection circuits as described below). Detection of a short, or lack of detection of a short, can be used to determine whether an audio accessory has been inserted or removed.
  • a change in state e.g., from detecting a short to not detecting a short, and vice versa
  • the detection terminals are provided at or near the tip end of the socket. In such cases, the tip contact of the audio plug will short the detection terminals. Positioning the detection terminals in this location can be beneficial as a short will generally only occur between the detection terminals when the audio plug is fully inserted within the audio jack. In contrast, although it is possible for the detection terminals to be positioned elsewhere within the socket (e.g., to be shorted by the sleeve of a TRS jack), this configuration can lead to false reads that may occur if either the tip contact or ring contact temporarily shorts the detection terminals as the audio plug is inserted.
  • the detection terminals are spaced apart within the socket (in some cases on opposite sides of the socket), it is less likely that particles (e.g., lint or dirt) will become stuck in between the terminals in a manner that interferes with the detection of the audio accessory.
  • the detection terminals are spaced apart in that there is a gap between them such that they are not in physical contact with one another, although the distance of the gap is not necessarily the same in all implementations.
  • a detection circuit cooperates with the detection terminals to detect the insertion or removal of an audio accessory (e.g., by monitoring the detection terminals and detecting the short).
  • the end terminal in an audio jack (which is designed to make electrical contact with the tip contact of the audio plug to send audio signals to the accessory) may be used as one of the detection terminals.
  • the detection terminals may be separate from the end terminal (although the detection terminals and end terminal may all be in contact with the tip contact at the same time).
  • the end terminal Since the end terminal is normally used to carry left channel audio information to an audio accessory, the end terminal normally does not have a fixed voltage. As such, the end terminal will often carry an audio signal with a voltage that can interfere with the detection of the accessory via the detection terminals. Thus, without a suitably configured detection circuit, false insertion or removal events (or both) might be registered (depending on the audio signal being sent through to the tip connector of the audio plug).
  • One such detection circuit may bias the detection terminals using a voltage source with high output impedance and with an output voltage (higher or lower) that is outside of the normal output voltage range of the audio amplifier that drives the left channel. Accordingly, an observed detection voltage can be checked using a voltage comparator. When a detection voltage is observed that is higher or lower than any output normally possible from the audio amplifier, a fairly reliable prediction can be made about the status of the audio accessory, despite large voltage variations that might be present in the audio output signal on the left channel.
  • a controlled current source may be coupled to the output on the left channel.
  • a well-defined current will run into the audio amplifier.
  • this current source will be unable to send out this current, and the output will immediately swing to the voltage rails. This swing can be detected by direct observation or from a control voltage of the current source.
  • inaudible tones e.g., ultrasonic tones
  • an ultrasonic tone e.g., a 32.768 kHz tone
  • the high frequency tone may be output directly through the audio amplifier.
  • the presence of a zero-crossing can be monitored at the detection terminal opposite the audio amplifier; if no zero-crossing is observed within a particular amount of time (e.g., within 100 milliseconds), this indicates that the detection terminals are not shorted and no audio accessory is inserted.
  • zero-crossings could be detected using a slow threshold detector with a time constant slower than the input filter and with a detection threshold close to either the higher or lowest supply voltage of the audio amplifier.
  • a high output impedance voltage source may be coupled to one of the detection terminals.
  • one or more special pulsing methods may be to detect the presence of multiple different audio plug configurations (e.g., TRS, TRRS, etc.).
  • inaudible waveforms may be used during detection to avoid unpleasant artifacts. This can be generated using pulses with an energy content lower than the human threshold, or with a frequency that is outside of the human hearing range (which is normally between approximately 20 Hz to 20,000 Hz). These pulses may be shaped in such a way that during the transition of turning on and off these pulses no audible artifacts occur. This may be done, for example, by slowly turning on and off the excitation of these waveforms to ensure that any energy content within the human hearing frequency range is sufficiently low so as to be generally inaudible.
  • any loads from the detection terminals during a detection sequence may be necessary to disconnect any loads from the detection terminals during a detection sequence. In some cases this may be done using a switch or by making the resistance value of the external load sufficiently large such that it will not be detected as a valid load at the insertion detection terminal when nothing is connected.
  • Figure 1 is a schematic diagram illustrating an electronic device 12 and an audio accessory 14 coupled thereto via an audio jack 11.
  • the electronic device 12 may include any suitable electronic device, such as a portable smart phone having a display 13, and which may include a memory, a processor, a communications system for communicating over a wireless network (e.g., a cellular network, a Wi-Fi network, etc.) and other functional components as will be generally understood.
  • a wireless network e.g., a cellular network, a Wi-Fi network, etc.
  • the electronic device 12 may have a physical keyboard 15 (as shown). In some embodiments, the electronic device 12 may include a touchscreen device, optionally with or without a physical keyboard 15.
  • the audio accessory 14 is a stereo headphone having two speakers (e.g., a right speaker 16 and a left speaker 18), although in other embodiments a different number of speakers could be present.
  • the speakers 16, 18 of the audio accessory 14 are generally operable to output audio content, such as music, speech, and so on.
  • the audio accessory 14 also includes a user control interface 20 for controlling aspects of the electronic device 12 (e.g., audio volume, changing music tracks, etc.), although in other embodiments no control interface 20 may be present.
  • a user control interface 20 for controlling aspects of the electronic device 12 (e.g., audio volume, changing music tracks, etc.), although in other embodiments no control interface 20 may be present.
  • the audio accessory 14 may be a headset that includes a microphone 30 for receiving audio signals (e.g., a user's voice) and for sending those audio signals to the electronic device 12.
  • the microphone 30 may be provided with the user control interface 20.
  • the microphone 30 may be provided at another location on the audio accessory 14.
  • control interface 20 may include a switch 22 that is adapted to short the microphone 30 to send control signals to the electronic device 12.
  • the control interface 20 may have various other control schemes.
  • the audio accessory 14 is connected to the electronic device 12 using an audio plug 50 on the audio accessory 14 that mates with a corresponding audio jack 11 on the electronic device 12.
  • the plug 50 and jack 11 can be of the tip-ring-sleeve (TRS) variety, or a tip-ring1-ring2-sleeve (TRRS) variety, or other various types.
  • TRS tip-ring-sleeve
  • TRRS tip-ring1-ring2-sleeve
  • some audio connectors are in the form of 3.5 mm (1/8") miniature plugs and jacks, or other sizes such as 2.5 mm connectors and 1/4" connectors. In headsets and other accessories, these audio connectors are generally used to carry audio signals and other information between the speakers 16, 18, the microphone 30 and the electronic device 12.
  • the presence or absence of the audio accessory 14 may be used to trigger the change of an operational state of the electronic device 12 (e.g., switching to speakerphone mode, pausing or resuming audio playback via the audio jack 11, and so on).
  • the audio jack includes a socket 35 that can generally be defined as having a tip-end 35a and an open end 35b.
  • the socket 35 is adapted to receive an audio plug 50 via the open end 35b, and when fully inserted the tip contact 52 of the audio plug 50 will generally be at or near the tip-end 35a of the socket 35.
  • the audio jack 40 includes a plurality of operational terminals adapted to make electrical contact with the audio plug 50 of the audio accessory.
  • the audio jack 40 includes an end terminal 41 adapted to make electrical contact with the tip contact 52 of the audio plug 50, a ring1 terminal 42 adapted to make electrical contact with the ring1 contact 54, a ring2 terminal 43 adapted to make electrical contact with the ring2 contact 56, and a sleeve terminal 44 adapted to make electrical contact with the sleeve contact 58.
  • each terminal 41, 42, 43 and 44 has an end portion 41 a, 42a, 43a, and 44a, respectively, adapted to be in physical contact with the contacts 52, 54, 56 and 58 when the audio plug 50 is received within the socket 35 (as shown in Figure 3 ).
  • the audio jack 40 also includes a detection pin 45, which in this embodiment is a "normally closed" detection pin.
  • a detection pin 45 which in this embodiment is a "normally closed" detection pin.
  • a contact terminal 45a of the detection pin 45 is in electrical contact with the end terminal 41. Accordingly, an electrical circuit between the detection pin 45 and the end terminal 41 is closed.
  • the end terminal 41 is a movable element.
  • the tip contact 52 of the audio plug pushes the end terminal 41 and breaking the electrical contact between the end terminal 41 and the detection pin 45.
  • This change in state can be used to indicate that the audio accessory has been inserted into the electronic device.
  • lint, dust or other particles can enter the audio jack 40, and may become stuck between the detection pin 45 and the end terminal 41, thus inhibiting the formation of an electrical circuit.
  • such particles can interfere with the movement of the end terminal 41. Both of these issues can result in detection failures in which the insertion or removal of an audio accessory may not be properly recognized.
  • the audio jack 60 includes a plurality of operational terminals adapted to make electrical contact with the audio plug 50.
  • the audio jack 60 includes an end terminal 61 with a portion 61 a adapted to make electrical contact with the tip contact 52, a ring1 terminal 62 with a portion 62a adapted to make electrical contact with the ring1 contact 54, a ring2 terminal 63 with a portion 63a adapted to make electrical contact with the ring2 contact 56, and a sleeve terminal 64 with a portion 64a adapted to make electrical contact with the sleeve contact 58.
  • the end terminal 61 serves as a first detection terminal
  • the audio jack 60 also includes a second detection terminal 65, having a portion 65a adapted to also make contact with the tip contact 52 of the audio plug 50.
  • the end portions 61 a and 65a of the detection terminals 61, 65 are spaced apart by a gap distance D.
  • the gap distance D may be selected to inhibit dust, lint, or other particles from becoming lodged therebetween. Typical gap distances may be on the order of a few millimeters, but there is no specific minimum or maximum distance.
  • the end portions 61 a and 65a of the detection terminals 61, 65 are on opposing sides of the socket 35 (as suggested by the figures; the detection terminals 61, 65 may be, but need not be, diametrically opposed) so as to increase the distance therebetween.
  • the detection terminals 61, 65 are provided at or near the tip-end 35a of the socket 35. Accordingly, the detection terminals 61, 65 will generally only indicate the presence of an audio plug 50 when the audio plug 50 is fully received within the audio jack 60.
  • the detection terminals may be provided at other locations within the socket 35, although this may increase the chance of misreads.
  • the ring2 terminal 63 could be used as a first detection terminal with a second detection terminal positioned opposite thereto within the socket 35.
  • FIG. 6 illustrated therein is a schematic diagram of an audio jack 70 according to another embodiment.
  • the audio jack 70 is generally similar to audio jack 60 and includes a plurality of operational terminals adapted to make electrical contact with the audio plug 50.
  • the audio jack 70 includes an end terminal 71, a ring1 terminal 72, a ring2 terminal 73, and a sleeve terminal 74.
  • the end terminal 71 serves as a first detection terminal
  • a second detection terminal 75 is provided in a spaced apart relationship thereto.
  • the operational terminals are positioned with a different pattern.
  • the end terminal 71 and ring2 terminal 73 are provided on a first side of the socket 35, while the detection terminal 75, ring1 terminal 72 and sleeve terminal 74 are provided on the opposite side.
  • terminals 71, 72, 73, 74 and 75 can be placed on the same side of a connector, or some of the terminals 71, 72, 73, 74 and 75 may be placed on the opposite side, or different embodiments some of the terminals 71, 72, 73, 74 and 75 may be placed below or above (or both) the terminals placed on the side of the socket.
  • the audio jack 80 is generally similar to audio jack 60 and includes an end terminal 81, a ring1 terminal 82, a ring2 terminal 83, and a sleeve terminal 84.
  • the end terminal 81 serves as a first detection terminal
  • a second detection terminal 85 is provided in a spaced apart relationship thereto.
  • the end terminal 81, ring1 terminal 82 and sleeve 84 are provided on a first side of the socket 35, while the detection terminal 85 and ring2 terminal 73 are provided on the opposite side.
  • the physical size of the connector may be reduced by placing the terminals on either side of the socket, thereby making one or more of the physical dimensions of width, height, or length smaller.
  • the inserted jack connector will tend to become more centered and thereby may make a more reliable contact to the detection terminals.
  • FIG 8 illustrated therein is a schematic diagram of the accessory 14 of Figure 1 , including the control interface 20 with the switch 22 for shorting the microphone 30 line. Also shown is the configuration of the audio plug 50 according to one possible embodiment, although in some cases other configurations for the pin connections may be possible.
  • the audio plug 50 shown here has a TRRS arrangement, and a different configuration would be provided in a TRS accessory.
  • the signals to the microphone 30 may be filtered in order to provide better immunity towards external interference (e.g., by using beads coupled in series with the signal lines or capacitors in parallel with the microphone).
  • the microphone 30 may include ESD protection, for example using a varistor or similar protection component.
  • FIG. 9 illustrated therein is a schematic diagram of a detection circuit 90 for use with detection terminals as generally described herein.
  • the detection circuit 90 is an example of a circuit that can monitor the detection terminals.
  • an end terminal e.g., end terminal 61 as shown in Fig. 5
  • the end terminal normally does not have a fixed voltage, and can carry an audio signal with a voltage that can interfere with the detection of the audio accessory via the detection terminals.
  • a suitably configured detection circuit can help to avoid signaling of false insertion or removal events that might be registered depending on the audio signal being sent through to the tip connector.
  • the detection circuit 90 includes a first detection terminal 91, which could be the end terminal 61, and a second detection terminal 95, which could be the detection terminal 65.
  • the detection circuit 90 is adapted to apply a bias voltage across the detection terminals 91, 95.
  • a bias voltage may be applied to the second detection terminal 95 using a voltage source 96.
  • the voltage experienced by the second terminal 95 can be monitored, for example using a voltage comparator 98.
  • the voltage source 96 may bias the detection terminal 95 with a voltage that is outside of the output voltage range of the audio amplifier 92.
  • the bias voltage applied by the voltage source 96 may be set to +3V or higher.
  • the voltage comparator 98 could be coupled to a reference voltage of approximately +2.4V. These voltages could have other values as long as the bias voltage is outside the normal range of operation of the audio amplifier so that threshold between these values can be made.
  • the voltage comparator 98 can indicate that an audio accessory is present.
  • the detection circuit 90 may indicate the detection of the presence of an audio accessory in any fashion, such as by generating or interrupting or varying or otherwise sending a signal (e.g., to a processor) indicating that the accessory has been detected. In this manner, the detection circuit 90 should provide a relative reliable prediction about the status of the accessory, despite large voltage variations that might occur over the audio channel.
  • the detection circuit 90 can include a switch 94 for selectively activating and deactivating the detection circuit 90.
  • the presence of the detection circuit 90 may in some cases interfere with the quality of the audio being sent to the audio accessory.
  • the detection circuit 90 may be operable to deactivate the bias voltage (e.g., the voltage source 96) when an audio accessory is detected.
  • the detection circuit 90 may be periodically activated to check and see whether the accessory has been removed (e.g., once per second, once every ten seconds, etc.)
  • a controlled current source 102 is coupled to detection terminal 95.
  • a current will run into the audio amplifier 92, which can be detected by a current detector 103 (e.g., which may include a comparator 104 and resistor 93).
  • this current source 102 will be unable to send out the current to the amplifier, and the output will swing to the voltage rails. This swing can be detected by direct observation or from a control voltage of the current source, and used to indicate that no accessory is present in the audio jack.
  • the detection circuit 110 is another example of a circuit that can monitor the detection terminals and detect a short between the detection terminals.
  • a tone generator 112 is coupled to one of the detection terminals (e.g., detection terminal 91), while a tone detector 114 is coupled to the other detection terminal (e.g., the detection terminal 95).
  • the tone generator 112 generates one or more tones (e.g., particular inaudible tones, such as ultrasonic tones with a frequency greater than 20kHz). If the tone detector 114 detects these tones, this is an indication that the detection terminals 91, 95 have been shorted and that an accessory is present.
  • the detection circuit 90 such as via the tone detector 114, may indicate (e.g., to a processor) that the audio accessory is present when the short is detected.
  • the detection circuit 90 may also indicate that the audio accessory is absent when the short is absent.
  • the inaudible tone(s) may further be modulated with a slower envelope signal (e.g., 100 Hz) to help suppress audible clicks that may be otherwise observed due to the transient conditions occurring immediately at the first contact during insertion.
  • a slower envelope signal e.g. 100 Hz
  • the ultrasonic signal may only be emitted once in a while (e.g., once per second, once every ten seconds, etc.) and with a low duty cycle.
  • the audio amplifier 92 may be used to generate or output the ultrasonic signals.
  • the tones may have various configurations so as to avoid possible pops, clicks or other audio artifacts.
  • the tones may be ultrasonic tones with energy levels selected so as to be generally inaudible to a human user.
  • the tone detector 114 may include synchronized demodulation and low pass filtering in order to protect against noise and thereby enable low amplitude levels to be used for the ultrasonic tone.
  • a zero-crossing detector 122 is coupled to the detection terminal 95 on the opposite side of the amplifier 92.
  • the zero-crossing detector 122 can thus monitor the second detection terminal 95. If no zero-crossing is observed (or no low amplitude value below a given offset or hysteresis) within a particular amount of time (e.g., 10 milliseconds, 100 milliseconds, etc.), this indicates that the detection terminals 91, 95 are not shorted and no audio accessory is inserted.
  • the detection terminal 95 may be connected to a voltage or current source to ensure sufficient margin against noise (similar to the configurations shown in Figure 9 and Figure 10 ).
  • the zero-crossing detector 122 could be a slow threshold detector with a time constant slower than the input filter and with a detection threshold close to either the higher or lowest supply voltage of the audio amplifier 92.
  • teachings herein may provide for an improved approach to detecting whether an audio accessory is coupled to an electronic device. More particularly, the teachings herein may be useful to detect when an audio accessory is inserted into an electronic device, or removed from an electronic device, or both.
  • one or more detection circuits may be used to ensure that the detected signals at the detection terminals are indicative of the presence of an audio accessory.
  • this information can be used to determine whether the electronic device should make an operational change (e.g., generating an alert, activating or deactivating a speaker, power up an electronic device or a component thereof, etc.)
  • teachings herein may provide one or more potential advantages as compared to prior approaches to accessory detection, some of which have been mentioned or suggested already.
  • teachings herein may provide for a robust and economical system that may be adaptable to wide number of accessory configurations.
  • the detection terminals and detection circuitry may not take up significant amounts of space within a portable electronic device (where space is often at a premium) or consume much power on a portable electronic device (where battery life may be a significant concern).
  • At least some embodiments may allow for the detection of an audio accessory regardless of whether an audio signal is present (e.g., music is playing) or not. Such a capability may represent a notable user convenience.

Landscapes

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

Claims (13)

  1. Dispositif électronique adapté de façon à détecter un accessoire audio, comprenant :
    une prise jack audio (11) comportant au moins deux bornes de détection (91, 95), les bornes de détection comprenant une première borne de détection (91) constituant une borne d'extrémité adaptée de façon à envoyer une information audio à un connecteur de pointe d'une prise audio (50) de l'accessoire audio et une deuxième borne de détection (95) mutuellement espacée de la borne d'extrémité et positionnée à l'intérieur de la prise jack audio (11), de telle sorte que, lorsque la prise audio (50) de l'accessoire audio est insérée dans la prise jack audio (11), la borne d'extrémité et une deuxième borne de détection (95) soient court-circuitées ; et un circuit de détection adapté de façon à appliquer une tension de polarisation à l'une des première et deuxièmes bornes de détection (91, 95), la tension de polarisation se trouvant à l'extérieur d'une plage de tension de sortie d'un amplificateur audio (92) couplé à l'autre des première et deuxième bornes de détection (91, 95), et adapté de façon à contrôler les bornes de détection (91, 95), et, lorsque le circuit de détection détecte un court-circuit entre celles-ci, à indiquer que l'accessoire audio est présent.
  2. Dispositif électronique selon la revendication 1, dans lequel le circuit de détection comprend un commutateur (94) agencé de façon à activer et à désactiver de façon sélective le circuit de détection.
  3. Dispositif électronique selon la revendication 2, dans lequel le circuit de détection est activé de façon périodique de façon à vérifier et à constater si l'accessoire audio a été ou non retiré.
  4. Dispositif électronique selon l'une quelconque des revendications précédentes, dans lequel le circuit de détection comprend une source de courant (102) adaptée de façon à envoyer un courant lorsque les bornes de détection (91, 95) sont court-circuitées.
  5. Dispositif électronique selon l'une quelconque des revendications précédentes, dans lequel le circuit de détection comprend un générateur de tonalité (112) couplé à l'une des bornes de détection (91, 95) et un détecteur de tonalité (114) couplé à l'autre des bornes de détection (91, 95), le générateur de tonalité (112) étant adapté de façon à générer une tonalité, et dans lequel la détection de la tonalité par le détecteur de tonalité (114) est indicative de la présence de l'accessoire audio.
  6. Dispositif électronique selon la revendication 5, dans lequel la tonalité est inaudible à un être humain.
  7. Dispositif électronique selon l'une quelconque des revendications précédentes, dans lequel les bornes de détection (91, 95) sont positionnées à l'intérieur d'une douille (35) de la prise jack audio (11) de façon à être court-circuitées par le même connecteur de la prise audio (50).
  8. Dispositif électronique selon l'une quelconque des revendications précédentes, dans lequel un changement dans l'état du court-circuit des bornes de détection (91, 95) est indicatif d'une insertion de l'accessoire audio ou d'un retrait de l'accessoire audio.
  9. Dispositif électronique selon l'une quelconque des revendications précédentes, dans lequel les bornes (91, 95) se trouvent sur des côtés opposés d'une douille (35) de la prise jack audio (11).
  10. Dispositif électronique selon l'une quelconque des revendications précédentes, dans lequel les bornes de détection (91, 95) se trouvent sur une extrémité de pointe d'une douille (35) de la prise jack audio (11) ou au voisinage de celle-ci, et sont adaptées de façon à être court-circuitées par un connecteur de pointe de la prise audio (50).
  11. Dispositif électronique selon l'une quelconque des revendications 5 à 10, dans lequel la tonalité est une tonalité ultrasonique.
  12. Dispositif électronique selon l'une quelconque des revendications précédentes, dans lequel le circuit de détection comprend un détecteur de passage au zéro (122) couplé à une borne de détection opposée à un amplificateur audio (92).
  13. Dispositif électronique selon la revendication 12, dans lequel le détecteur de passage au zéro (122) est adapté de façon à indiquer qu'aucun accessoire audio n'est présent si aucun passage au zéro n'est détecté à l'intérieur d'un temps particulier.
EP13156738.0A 2013-02-26 2013-02-26 Appareil, systèmes et procédés pour détecter l'insertion ou le retrait d'un accessoire audio à partir d'un dispositif électronique Active EP2770748B1 (fr)

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EP13156738.0A EP2770748B1 (fr) 2013-02-26 2013-02-26 Appareil, systèmes et procédés pour détecter l'insertion ou le retrait d'un accessoire audio à partir d'un dispositif électronique

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CN108492543B (zh) * 2018-03-19 2021-06-15 苏州佳世达光电有限公司 一种主机设备、输入操控设备及讯号传输侦测方法
CN109713511B (zh) * 2019-02-11 2020-09-04 Oppo广东移动通信有限公司 检测电路、耳机插座、方法及移动终端
CN111929734B (zh) * 2020-05-29 2023-08-04 维沃移动通信有限公司 电子设备和控制方法

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US7912501B2 (en) * 2007-01-05 2011-03-22 Apple Inc. Audio I/O headset plug and plug detection circuitry
US7627128B2 (en) * 2008-01-14 2009-12-01 Apple Inc. Methods of calibrating tone-based communications systems
US8861743B2 (en) * 2008-05-30 2014-10-14 Apple Inc. Headset microphone type detect
KR101719302B1 (ko) * 2010-01-08 2017-03-23 삼성전자주식회사 이어플러그 인식을 위한 이어잭
US20120081102A1 (en) * 2010-09-30 2012-04-05 Apple Inc. Audio jack with ground detect
EP2461553B1 (fr) * 2010-12-01 2015-05-27 BlackBerry Limited Appareil, systèmes et procédés pour contrôler un dispositif électronique au moyen d'un accessoire

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