EP2458891B1 - System und Verfahren zur Mikrofonpolaritätserkennung - Google Patents

System und Verfahren zur Mikrofonpolaritätserkennung Download PDF

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Publication number
EP2458891B1
EP2458891B1 EP20100193223 EP10193223A EP2458891B1 EP 2458891 B1 EP2458891 B1 EP 2458891B1 EP 20100193223 EP20100193223 EP 20100193223 EP 10193223 A EP10193223 A EP 10193223A EP 2458891 B1 EP2458891 B1 EP 2458891B1
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EP
European Patent Office
Prior art keywords
line
microphone
ground
detection signal
signal
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EP20100193223
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English (en)
French (fr)
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EP2458891A1 (de
Inventor
Jens Kristian Poulsen
Mohamad El-Hage
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BlackBerry Ltd
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BlackBerry Ltd
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Priority to EP20100193223 priority Critical patent/EP2458891B1/de
Priority to CA2759143A priority patent/CA2759143C/en
Priority to CN201110378057.1A priority patent/CN102480670B/zh
Publication of EP2458891A1 publication Critical patent/EP2458891A1/de
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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
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • 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
    • H04R1/1091—Details not provided for in groups H04R1/1008 - H04R1/1083
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R29/00—Monitoring arrangements; Testing arrangements
    • H04R29/004—Monitoring arrangements; Testing arrangements for microphones

Definitions

  • the present disclosure is generally directed at microphones and more specifically is directed at a method and system for microphone polarity detection.
  • Portable electronic device use has continued to increase over the years with new applications and functionality continually being incorporated within these devices.
  • the introduction of these new applications and functionality require the devices themselves to be updated in order to handle new requirements associated with these applications and functionality.
  • a headset with a microphone is used to fully enhance the usability of these applications or functionality.
  • the headset In order to connect the headset with the device, the headset is typically connected via the insertion of a jack into a device port.
  • WO 2000/060831 discloses an interface device for (1) automatically diagnosing the type and terminal connections of the earphone and microphone transducers used in any handset or headset and (2) automatically connecting any transducer set provided as a replacement handset or headset to emulate the original handset or headset. Subsequently, the user can connect, without further action, the replacement transducer set to the telephone base station.
  • US 2005/0201568 discloses a detector circuit for detecting whether a headset is present (inserted) in a jack by measuring the impedance between the connection points of the jack.
  • the detector circuit further determines the headset type (e.g., whether of cellular headset, stereo headset or stereo+cellular headset) by measuring the impedance between the connection points of the jack.
  • Power consumption may be reduced by powering down components which determine headset type if the headset is determined not to be present. Additional power reduction is attained by checking for headset removal only periodically if the headset is determined to be present.
  • the following disclosure generally presents apparatus and techniques for handling polarity detection in microphones, typically within headsets for use with potable electronic devices.
  • portable electronic devices are designed to receive headsets that are designed to be compatible with the device in that the polarity of the microphone is known. Therefore, users are restricted to using headsets that are designed for a specific portable electronic device and the electronic device is unable to interact with other headsets. Therefore, headsets which are not implemented with the polarity that is being expected by the device may not be operational with the device.
  • portable electronic devices may be able to interact with any headset and is not limited to use with headsets which are specifically designed for the device.
  • the detection may be achieved by sending out a detection signal, such as a AC or a DC signal, on the microphone line or on the ground line and receiving a return signal on one of the audio headphone lines.
  • a detection signal such as a AC or a DC signal
  • the detection signal may be transmitted over an audio line and then the return signal sensed over either the ground line or the microphone line.
  • the detection signal is being transmitted over one of the ground or microphone line, while the detection signal is being transmitted, the other of the ground or microphone line is kept at a different potential and the sensing of the return signal is on an audio line.
  • the microphone line is held at a potential different than the detection signal and a return signal can be sensed on at least one of the audio lines.
  • the detection signal is transmitted on the microphone line, the ground line is kept at a different potential, typically no return signal will be sensed on either of the audio lines.
  • a detection signal is transmitted on an audio line, while the microphone line is kept at a steady potential, a return signal, or pulse can be sensed on the ground line.
  • no return signal will be sensed on the microphone line. This will described in more detail below.
  • the present disclosure may provide a method of determining an actual ground line in a headset, the headset comprising at least one audio line, a ground line and a microphone line, the method comprising: connecting one of the ground or microphone line to a ground reference voltage; transmitting a first detection signal over the other of the ground or microphone lines; measuring a first return signal of the at least one audio line; and determining the actual ground line based on the first return signal.
  • the present disclosure may provide a method of determining an actual ground line in a headset, the headset comprising at least one audio line, a ground line and a microphone line, the method comprising: connecting one of the ground line or the microphone line to a ground reference voltage; transmitting a first detection signal over one of the at least one audio line; measuring a first return signal over the other of the ground line or the microphone line which is not connected to the ground reference voltage; and determining the actual ground line based on the first return signal.
  • the present disclosure may provide a system for detecting an actual ground line within a headset when a headset cable has been inserted into a mobile device communication port, the cable comprising at least one audio line, a ground line and a microphone line, the system comprising: a switch matrix and jack detect; a set of pin ports located within the switch matrix for receiving the at least one audio line, the ground line and the microphone line; a signal generator for transmitting a detection signal; a set of detectors for detecting return signals of the at least one audio line in response to transmission of the detection signal; and a processor for detecting the actual ground line based on the return signals sensed by the set of detectors by comparing the return signals with the detection signal; the system being configured such that after the cable is sensed, one of the ground line or the microphone line is connected to a ground reference voltage and the detection signal is transmitted over the other of the ground or microphone line.
  • the mobile communication device 10 has a body 12 which includes a display screen 14, a keyboard/keypad 16, a set of buttons 18 and a user-operated pointing or input device 20, such as a trackpad or a trackball.
  • the user-operated pointing or input device may also be a joystick, scroll wheel, roller wheel, mouse or touchpad or the like, or another button.
  • the mobile communication device 10 also includes at least one port for receiving a jack, but this is not shown in Figure 1 .
  • the device 10 further includes other parts which are not shown or described.
  • the device may be sized to be held or carried in the human hand.
  • the mobile communication device 10 further includes a controller, or processor, 30 which is connected to a chip 32 which is integrated within the communication device 10.
  • a signal generator, such as a voltage source, 33 is also connected to the chip 32.
  • the chip 32 includes a switch matrix and jack configuration detect portion 34 which is integrated with a port 36 for receiving a jack 38 associated with a cable 40, such as a microphone/headset cable.
  • the switch matrix 34 includes a plurality of individual input and output ports 42 for receiving and transmitting signals with corresponding wires 44 connected within the jack 38.
  • the pin port PIN5 input detects the insertion of the cable by the opening or closing of a mechanical switch, when the plug or jack 38 is inserted.
  • pin port PIN5 is broken or absent, it is possible to detect the insertion of the cable by detecting a capacitance of the cable itself.
  • one or more contacts can be connected.
  • “connected” refers not necessarily to physical contact or proximity—although the contacts may be physically close to or touching one another—but to the electrical connection whereby a signal in one contact results in a signal in the other.
  • Such electrical connection may be completed or broken by affecting a current path (e.g., with the switch matrix 34) rather than by changing the physical relationship of one contact to another.
  • the wires or lines 44 within the jack 38 represent signal lines, such as audio lines, with one wire 44a representing a right audio or headphone line, one wire 44b representing a left audio or headphone line and then a pair of lines 44c and 44d providing a ground line and a microphone line.
  • the jack may include only one audio line.
  • the ground line may be provided on the line 44c which is connected to pin port PIN3 and the microphone line provided on line 44d which is connected to port pin PIN4.
  • the ground line is also connected to a ground reference voltage.
  • ground is not necessarily earth potential, and a "ground line" need not be electrically connected to the Earth. Rather, ground basically connotes a node that is maintained at a reference voltage that is substantially constant with respect to other voltages.
  • FIG. 3 a more detailed schematic diagram of a system for polarity detection of a microphone within a headset is shown.
  • the four wires, or lines 44a to 44d of the jack are connected to the ports 42 of the switch matrix 34.
  • the audio lines 44a and 44b are also connected to individual headphones 310 within the headset.
  • the headset may include only one headphone.
  • the signals may be transmitted or sensed over a single audio line without affecting the apparatus or method of polarity detection.
  • the headset may include only one headphone and one audio line but method of polarity detection may still be executed.
  • the method of polarity detection may be executed using only one of the two headphones.
  • the detector 54 may be implemented as a low pass filter and a rectifier.
  • the detector is a pre-amplifier followed by a threshold detector.
  • the detector is a demodulator followed by a lowpass filter and a threshold detector.
  • the detector is a threshold detector.
  • the threshold detector can be implemented using a fixed threshold comparator.
  • the threshold detector can be implemented via an analog-to-digital converter (ADC) and a fixed digital threshold.
  • ADC analog-to-digital converter
  • the detectors may be discrete components within the portable electronic device but in other embodiments, they are implemented on the chip 32.
  • Each detector 54 is connected to a state machine 56, which may be located on the chip 32 or within the processor 30, to transmit signals representing the return signals or measurements recorded by the detectors 54.
  • the state machine 56 processes or transmits the results of the sensed return signal or transmits results based on the signals sensed by its associated detector 54 to the processor 30 so that the processor may determine the polarity of the microphone.
  • the state machine 56 is a deciding circuit, which receives inputs from its associated detector 54, decides what condition or conditions are indicated by those inputs (such as whether a particular state is present or absent), then transmits a signal to the processor 30 as a function of that decision.
  • the detection signal is transmitted over the microphone line 44d (or the line connected to pin port PIN4) and the return signal is sensed on the one or both of the headphone or audio lines 44a or 44b.
  • the detection signal schematically represented by U 1 is either an AC signal or a DC signal while the ground line 44c is maintained at a different potential, schematically represented by U 2 where U 2 does not equal U 1 .
  • the return signal may be sensed by one of the detectors 54 connected to at least one of the audio lines 44a or 44b.
  • the detector 54 is integrated as part of the switch matrix 34, or the chip 32, but in another embodiment, may be located, or integrated within the headset. If the detector 54 is or detectors 54 are located within the headset, the headset communicates with the processor 30 to provide information concerning the return signal or signal(s) which are sensed.
  • the detection signal is transmitted over the ground line 44c (or the line connected to pin port PIN3) and the return signal sensed over at least one of the audio lines 44a or 44b.
  • the detection signal is either an AC signal or a DC signal while the microphone line 44d is maintained at a different potential, schematically represented by U 2 where U 2 does not equal U 1 .
  • the return signal may be sensed by one of the detectors 54 connected to at least one of the audio lines 44a or 44b.
  • FIG. 6 a flowchart outlining a first method of microphone polarity detection is shown.
  • voice signals are typically transmitted over the microphone line.
  • the microphone line may be connected to either pin port PIN3 or pin port PIN4. This may be problematic since signals can not be transmitted over the ground line and therefore a determination is required to see over which pin port the audio signals are to be transmitted, or, in other words, the pin port which is connected to the microphone line.
  • the portable electronic initially assumes that the microphone line 44d is connected to pin port PIN4 and the ground line 44c is connected to pin port PIN3. However, depending on the results of the polarity detection, the opposite conclusion may be determined.
  • pin port PIN1 and pin port PIN2 receive the audio lines 44a and 44b which are characterized as Left audio and Right audio while pin port PIN5 is used for detecting the presence of the jack.
  • pin ports PIN3 and PIN4 one of these pin ports is connected to the ground line while the other is connected to the microphone line.
  • the method is initiated once the insertion of the jack of the headset cable into the port is sensed 100 whereby the individual lines 44 are connected to associated pin ports. In one embodiment, this is achieved by detecting the presence of the jack 38 on pin port PIN5 of the switch matrix and jack configuration detect portion 34. Alternatively, internal device logic may assist in determining or may determine when the jack is inserted based on the capacitance of the cable itself or by the coupling between some of the lines 44. In this configuration, it is possible to detect the insertion of the headset, even if the pin port PIN5 is non-functional or not existent.
  • a detection signal either AC or DC
  • the AC or DC signal is generated and transmitted by the signal generator 33.
  • the detection signal is then propagated through the cable 40.
  • the detection signal may be a sine wave or a square wave although other signals are contemplated. While the detection signal is transmitted over one of the lines connected to pin port PIN3 or pin port PIN4, the other of the lines is connected to a known potential, such as a ground potential or ground reference voltage
  • the transmission of the detection signal may result in activity on the audio lines 44a and 44b in response to the signal, which is measured as a return signal or a measured output voltage.
  • the return signal or signals transmitted over the audio lines (lines 44a and 44b) are then sensed 106 or read over pin port PIN1 and/or pin port PIN2 by the associated detectors 54.
  • the audio lines 44a and 44b are kept in a high impedance (tri-state) mode when the return signal is sensed in order to minimally affect the measurement.
  • a detection signal of low amplitude or signals that are outside the audible bandwidth may be used.
  • the polarity of the microphone or headset may be determined.
  • a check is performed to determine if a particular return signal is sensed, or measured, 108 on one of the audio lines. If a particular return signal is sensed, it can be concluded 110 that a headset, or headphone and microphone combination, has been connected to the switch matrix 34.
  • the particular return signal may be a signal which substantially corresponds to, substantially matches or is comparable in magnitude with the detection signal or a signal which is above a threshold with respect to the detection signal.
  • the polarity of the microphone can then be determined. As signals have a very good coupling to the audio lines through the ground line and the headphones themselves, if the particular return signal is sensed on one of the audio lines, it can be determined 111 that the line over which the detection signal was transmitted is the ground line. This determination may be achieved with the assistance of the state machines. In one embodiment of the state machine, if the return signals from both detectors 54 are above a certain threshold (with reference to the transmitted sensed signal), the state machine receives these signals and transmits a signal to the processor indicating if a condition was met, such as, but not limited to, if the particular return signal was sensed on an audio line.
  • the state machine may transmit a signal indicating which of lines 44c or 44d is the ground line by confirming that the particular return signal was sensed.
  • the state machine may also directly configure the switch matrix 34 to identify the ground and microphone lines without intervention from the processor. In other words, it may be determined that the output of the state machine corresponds to a 1 and therefore, it may be concluded that the detection signal was transmitted over the microphone line. Alternatively, it may be determined that the output of the state machine corresponds to a 0 and therefore, it may be concluded that the detection signal was transmitted over the microphone line.
  • the processor may then receive the status of the pin selection, or information concerning which pin port is connected to which line, by an interrupt or logic pin signaling an event or the processor can poll the electronic device or the chip 32 to ask for status, such as, but not limited to the status of the lines.
  • the determination of the ground line (and therefore the microphone line) can either be made automatically by the state machine or by the processor if the particular return signal is sensed.
  • the polarity of the microphone the headset may then be stored in the processor, or other components, or the switch matrix automatically configured for correct ground connection, so that the signals from the device may be corrected transmitted to the headset.
  • the particular return signal is not sensed, or measured, at 108, another detection, or a second detection, signal is then transmitted 112 over the other of the line between pin ports PIN3 and PIN4.
  • the line over which the detection signal is not transmitted is set to a known potential, such as a ground potential by connecting the line to a ground reference voltage.
  • the output of at least one of the audio lines is sensed 114 to determine if a particular return signal is sensed.
  • a check is then performed to determine 116 if the particular return signal is sensed such that the output of the at least one audio line substantially corresponds with the detection signal. If the particular return signal is sensed, it can be determined 110 that a headset, or headphone and microphone combination, has been connected to the switch matrix 34 or device.
  • the polarity of the microphone can then be determined 111 as discussed above.
  • the polarity of the microphone within the headset is then stored in the processor, or other components, or the switch matrix is automatically configured for correct ground connection, so that the signals from the device may be corrected transmitted to the headset.
  • the cable that has been inserted into the jack may be, but is not limited to, a microphone without a headset, or a microphone extension cable.
  • FIG. 7 a more detailed schematic diagram of another embodiment of apparatus for the polarity detection of a microphone within a headset is shown.
  • the four wires, or lines 44a to 44d are connected to the ports 42 of the switch matrix 34.
  • the audio lines 44a and 44b are connected to individual headphones 310.
  • detectors 54 associated with each of the ports 42 connected to the microphone line 44d and the ground line 44c are detectors 54 which are communicatively connected to the output of the lines 44c and 44d to monitor return signals being transmitted over the wires in response to one or more detection signals transmitted over one of audio lines 44a or 44b (as will be discussed in further detail below).
  • Each of the detectors 54 may be implemented in any of the manners discussed or via any detection circuitry or components.
  • the detectors can be discrete components within the portable electronic device but may also be implemented on the chip 32.
  • Each detector 54 is connected to a state machine 56, which may also be located on the chip 32 or within the processor 30, to transmit signals representing the sensed return signals, or measurements recorded by the detectors 54.
  • the state machine 56 transmits signals representing the conditions met by the return signal sensing by its associated detector 54 to the processor 30 so that the processor can determine the polarity of the microphone.
  • the state machine may transmit a signal indicating which of the microphone line and the ground line (from the point of view of the portable electronic device) is the actual ground line or the actual microphone line.
  • the detection signal is transmitted over one of the audio lines, such as the left audio line 44a and the return signal is sensed on the microphone line 44d (from the point of view of the portable electronic device).
  • the detection signal is either an AC signal or a DC signal while the other audio line 44b is maintained at a different potential or tri-stated, schematically represented by U 2 .
  • the ground line 44c (or the line that is not being sensed for the particular return signal), is driven to a known potential, schematically represented by U 3 , such as a ground potential.
  • the particular return signal may be sensed by the detectors 54 connected to the microphone line to assist in determining the polarity of the microphone within the headset.
  • the detection signal may be transmitted over the right audio line 44b with the potential of the left audio line 44a held at the same potential level or tri-stated.
  • the detection signal is transmitted over one of the audio lines, such as the left audio line 44a, and the return signal sensed on the ground line 44c (from the point of view of the portable electronic device).
  • the detection signal is either an AC signal or a DC signal while the other audio line 44b is maintained at a different potential or tri-stated, schematically represented by U 2 .
  • the microphone line 44d (or the line that is not being sensed for the particular return signal), is driven to a known potential, schematically represented by U 3 , such as a ground potential.
  • the particular return signal may be sensed by the detector 54 connected to the ground line to assist in determining the polarity of the microphone within the headset.
  • the detection signal may be transmitted over the right audio line 44b.
  • FIG. 10 a flowchart outlining another method of microphone polarity detection is shown.
  • voice signals are typically transmitted over the microphone line.
  • the microphone line may be connected to either pin port PIN3 or pin port PIN4. This may be problematic since signals can not be transmitted over the ground line and therefore a determination is required to see over which pin port the audio signals are to be transmitted, or, in other words, the pin port which is connected to the microphone line.
  • the portable electronic initially assumes that the microphone line 44d is connected to pin port PIN4 and the ground line 44c is connected to pin port PIN3. However, depending on the results of the polarity detection, the opposite conclusion may be determined.
  • pin port PIN1 and pin port PIN2 receive the audio lines 44a and 44b which are characterized as audio lines while pin port PIN5 is used for detecting the presence of the jack.
  • pin ports PIN3 and PIN4 one of these pin ports is connected to the ground line while the other is connected to the microphone line.
  • the method is initiated once the insertion of the jack of the headset cable into the port is sensed 200 whereby the individual lines 44 are connected to associated pin ports.
  • a detection signal either AC or DC
  • the AC or DC signal is generated and transmitted by the signal generator 33.
  • the detection signal is then propagated through the cable 40.
  • the detection signal may be a sine wave or a square wave although other signals are contemplated.
  • the transmission of the detection signal may result in activity, in the form of a return signal on microphone line 44d or the ground line 44c in response to the detection signal, which is measured as a return signal, or measured output voltage.
  • the ground line or line connected to pin point PIN3
  • the return signal transmitted over the microphone line is sensed 206 or read over pin port PIN4 by the associated detector 54.
  • the microphone line 44d is kept in a high impedance (tri-state) mode when the measurements are taken in order to minimally affect the measurement.
  • the polarity of the microphone or headset can be determined.
  • a check is performed to determine if a particular return signal is sensed 208 on the microphone line 44d (or the line connected to pin port PIN4). If a particular return signal is sensed, it can be concluded 210 that a headset, or headphone and microphone combination, has been connected to the switch matrix 34.
  • the particular return signal may be a signal which substantially corresponds to, substantially matches or is comparable in magnitude with the detection signal or above a threshold with respect to the detection signal.
  • the particular return signal is sensed on the microphone line 44d, it can be determined 211 that this line is in fact the ground line and the ground line (from the initial assumption of the portable electronic device) is the microphone line. As discussed above, this determination may also be performed with the state machine 56.
  • the polarity of the microphone within the headset is then stored in the processor, or other components, or the switch matrix is automatically configured for correct ground connection, so that the signals from the device may be corrected transmitted to the headset.
  • the particular return signal is not sensed at 208, another detection, or a second detection signal is then transmitted 212 over one of the audio lines 44a or 44b.
  • the output of the ground line (from the viewpoint of the portable electronic device) or the line connected to pin port PIN3, is then sensed 214.
  • a check is then performed to determine 216 if the particular return signal is sensed on the ground line. If the particular return signal is sensed, it can be concluded 210 that a headset, or headphone and microphone combination, has been connected to the switch matrix 34.
  • the polarity of the microphone can then be determined 211 as discussed above whereby the line connected to pin port PIN3 is the ground line and the line connected to pin port PIN4 is the microphone line.
  • the cable that has been inserted into the jack may be, but is not limited to, a microphone without a headset, or a microphone extension cable.
  • detectors 54 may be associated with each of the lines and depending on which line the detection signal is transmitted, the detector for specific lines may or may not be activated for the sensing of the particular return signal or the polarity detection.

Claims (15)

  1. Ein Verfahren zum Bestimmen einer tatsächlichen Masseleitung in einem Headset bzw. einer Sprechgarnitur, wobei die Sprechgarnitur zumindest eine Audioleitung (44a, 44b), eine Masseleitung (44c) und eine Mikrofonleitung (44d) aufweist, wobei das Verfahren aufweist:
    Verbinden einer der Masse- oder Mikrofonleitung (44c, 44d) mit einer Massereferenzspannung;
    Übertragen eines ersten Erfassungssignals über die andere der Masse-oder Mikrofonleitungen (44c, 44d);
    Messen eines ersten Rücksignals von der zumindest einen Audioleitung (44a, 44b); und
    Bestimmen der tatsächlichen Masseleitung basierend auf dem ersten Rücksignal durch Vergleichen des ersten Rücksignals mit dem ersten Erfassungssignal.
  2. Ein Verfahren zum Bestimmen einer tatsächlichen Masseleitung in einer Sprechgarnitur, wobei die Sprechgarnitur zumindest eine Audioleitung (44a, 44b), eine Masseleitung (44c) und eine Mikrofonleitung (44d) aufweist, wobei das Verfahren aufweist:
    Verbinden einer der Masseleitung oder der Mikrofonleitung (44b, 44c) mit einer Massereferenzspannung;
    Übertragen eines ersten Erfassungssignals über eine der zumindest einen Audioleitung (44a, 44b);
    Messen eines ersten Rücksignals über die andere der Masseleitung oder der Mikrofonleitung (44b, 44c), die nicht mit der Massereferenzspannung verbunden ist; und
    Bestimmen der tatsächlichen Masseleitung basierend auf dem ersten Rücksignal durch Vergleichen des ersten Rücksignals mit dem ersten Erfassungssignal.
  3. Das Verfahren gemäß Anspruch 1 oder Anspruch 2, das weiter aufweist:
    Erfassen eines Vorhandenseins der Sprechgarnitur vor einem Verbinden einer der Masse- oder Mikrofonleitung (44c, 44d) mit der Massereferenzspannung.
  4. Das Verfahren gemäß Anspruch 2 oder Anspruch 3, wenn abhängig von Anspruch 2, wobei die tatsächliche Masseleitung als die Leitung bestimmt wird, über die das erste Rücksignal gemessen wurde, wenn das erste Rücksignal im Wesentlichen dem ersten Erfassungssignal entspricht.
  5. Das Verfahren gemäß einem der Ansprüche 2 bis 4, wobei, wenn das erste Rücksignal im Wesentlichen nicht dem ersten Erfassungssignal entspricht, das Verfahren weiter aufweist:
    Verbinden der anderen der Masse- oder Mikrofonleitung (44c, 44d) mit der Massereferenzspannung;
    Übertragen eines zweiten Erfassungssignals über die zumindest eine Audioleitung (44a, 44b);
    Messen eines zweiten Rücksignals auf der Leitung, die nicht mit der Massereferenzspannung verbunden ist; und
    Bestimmen, ob das zweite Rücksignal im Wesentlichen dem zweiten Erfassungssignal entspricht.
  6. Das Verfahren gemäß Anspruch 5, wobei die tatsächliche Masseleitung als die Leitung bestimmt wird, über die das zweite Rücksignal gemessen wurde, wenn das zweite Rücksignal im Wesentlichen dem zweiten Erfassungssignal entspricht.
  7. Das Verfahren gemäß Anspruch 5 oder 6, wobei bestimmt wird, dass kein Mikrofon verbunden ist, wenn das zweite Rücksignal im Wesentlichen nicht dem zweiten Erfassungssignal entspricht.
  8. Das Verfahren gemäß einem der Ansprüche 1 bis 7, wobei das Bestimmen der tatsächlichen Masseleitung aufweist:
    Übertragen des ersten Rücksignals an eine Zustandsmaschine (56);
    Empfangen einer Ausgabe der Zustandsmaschine (56); und
    Bestimmen, über welche Leitung das erste Erfassungssignal übertragen wurde.
  9. Das Verfahren gemäß Anspruch 8, wenn abhängig von Anspruch 1, wobei, wenn die Ausgabe der Zustandsmaschine (56) einer 1 entspricht, die Leitung, über die das erste Erfassungssignal übertragen wurde, als die Mikrofonleitung (44d) bestimmt wird.
  10. Das Verfahren gemäß Anspruch 8 oder Anspruch 9, wenn abhängig von Anspruch 1, wobei, wenn die Ausgabe der Zustandsmaschine (56) einer 0 entspricht, die Leitung, über die das erste Erfassungssignal übertragen wurde, als die Mikrofonleitung (44d) bestimmt wird.
  11. Ein System zum Erfassen einer tatsächlichen Masseleitung in einer Sprechgarnitur, wenn ein Sprechgarnitur-Kabel (40) in einen Kommunikationsanschluss (36) einer mobilen Vorrichtung eingefügt wurde, wobei das Kabel (40) zumindest eine Audioleitung (44a, 44b), eine Masseleitung (44c) und eine Mikrofonleitung (44d) aufweist, wobei das System aufweist:
    eine Schaltmatrix und Buchse-Erfassung (34);
    einen Satz von Stiftanschlüssen (42), der sich in der Schaltmatrix (34) befindet, zur Aufnahme der zumindest einen Audioleitung (44a, 44b), der Masseleitung (44c) und der Mikrofonleitung (44d);
    einen Signalgenerator (33) zum Übertragen eines Erfassungssignals;
    ein Satz von Detektoren (54) zum Erfassen von Rücksignalen von der zumindest einen Audioleitung (44a, 44b) in Reaktion auf eine Übertragung des Erfassungssignals; und
    einen Prozessor (30) zum Erfassen der tatsächlichen Masseleitung basierend auf den Rücksignalen, die von dem Satz von Detektoren (54) erfasst werden, durch Vergleichen der Rücksignale mit dem Erfassungssignal;
    wobei das System konfiguriert ist derart, dass, nachdem das Kabel (40) erfasst wird, eine der Masseleitung (44c) oder der Mikrofonleitung (44d) mit einer Massereferenzspannung verbunden wird und das Erfassungssignal über die andere der Masse- oder Mikrofonleitung (44c, 44d) übertragen wird.
  12. Das System gemäß Anspruch 11, wobei der Satz von Stiftanschlüssen (42) einen Anschluss (PIN5) zum Erfassen eines Vorhandenseins des Kabels (40) aufweist.
  13. Das System gemäß Anspruch 12, das konfiguriert ist zum Erfassen des Vorhandenseins des Kabels (40) durch Messen einer parasitären Kapazität des Kabels (40) zwischen zumindest einer der Leitungen (44a, 44b, 44c, 44d) und der Massereferenzspannung.
  14. Das System gemäß einem der Ansprüche 11 bis 13, das weiter aufweist:
    eine Vorrichtung (56) zum Empfangen der Ausgaben von dem Satz von Detektoren (54) und zum Übertragen eines Ergebnisses der Ausgaben an den Prozessor (30).
  15. Das System gemäß einem der Ansprüche 11 bis 14, das weiter aufweist:
    eine Vorrichtung (56) zum automatischen Empfangen der Ausgaben von dem Satz von Detektoren (54) und zum Übertragen eines Ergebnisses der Ausgaben an den Prozessor (30).
EP20100193223 2010-11-30 2010-11-30 System und Verfahren zur Mikrofonpolaritätserkennung Active EP2458891B1 (de)

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EP20100193223 EP2458891B1 (de) 2010-11-30 2010-11-30 System und Verfahren zur Mikrofonpolaritätserkennung
CA2759143A CA2759143C (en) 2010-11-30 2011-11-23 System and method for microphone polarity detection
CN201110378057.1A CN102480670B (zh) 2010-11-30 2011-11-24 用于麦克风极性检测的系统及方法

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6377678B1 (en) * 1999-04-01 2002-04-23 Knowles Electronics, Llc Telephone handset emulator
US7450726B2 (en) * 2004-03-11 2008-11-11 Texas Instruments Incorporated Headset detector in a device generating audio signals
CN101951446B (zh) * 2004-10-25 2016-11-23 诺基亚技术有限公司 经由音频/视频插头连接到电子设备的外围设备的检测、识别和操作

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CN102480670B (zh) 2015-07-01
CA2759143A1 (en) 2012-05-30
EP2458891A1 (de) 2012-05-30
CA2759143C (en) 2015-05-19

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