WO2012031481A1 - Circuit adaptatif d'une interface d'écouteur - Google Patents

Circuit adaptatif d'une interface d'écouteur Download PDF

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Publication number
WO2012031481A1
WO2012031481A1 PCT/CN2011/073199 CN2011073199W WO2012031481A1 WO 2012031481 A1 WO2012031481 A1 WO 2012031481A1 CN 2011073199 W CN2011073199 W CN 2011073199W WO 2012031481 A1 WO2012031481 A1 WO 2012031481A1
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WO
WIPO (PCT)
Prior art keywords
pin
earphone
electronic device
bias
resistor
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Application number
PCT/CN2011/073199
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English (en)
Chinese (zh)
Inventor
戚燃
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中兴通讯股份有限公司
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Publication of WO2012031481A1 publication Critical patent/WO2012031481A1/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
    • H04R29/00—Monitoring arrangements; Testing arrangements
    • H04R29/004—Monitoring arrangements; Testing arrangements for 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
    • H04R1/1041—Mechanical or electronic switches, or control elements
    • 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
    • H04R2420/01—Input selection or mixing for amplifiers or loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2420/00—Details of connection covered by H04R, not provided for in its groups
    • H04R2420/03—Connection circuits to selectively connect loudspeakers or headphones to amplifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • 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

Definitions

  • the present invention relates to a headphone interface technology, and in particular, to a headphone interface adaptive circuit. Background technique
  • Earphone jacks of early mobile phones use dedicated interfaces or 2.5mm interfaces.
  • Mobile phone headsets are also mainly used for call functions.
  • Now more and more music or multimedia features are selected as 3.5mm standard interfaces.
  • Headphone jack so users can choose high-quality 3.5mm stereo headphones on the market, users can also use the phone as a sound source to input to audio amplifiers or other audio equipment through the headphone jack.
  • 3.5mm standard headphones There are 3 feet and 4 feet in the number of pins.
  • the commonly used 4-pin 3.5mm headphone connectors follow the Japanese JEITA EIAJ RC-5325A standard in mechanical structure. This standard has been revised based on the 3-pin 3.5mm headphone connector JIS C 6560 standard, both of which define only mechanical dimensions and electrical characteristics, but do not define pin functions.
  • Figure 1 is a schematic diagram showing the structure comparison of the two types of earphone plugs.
  • the upper part of Figure 1 defines the common 3-pin 3.5mm stereo headphone plug: the first pin 01 is the left channel; the second pin 02 is the right channel; the third pin 03 is the ground, the 3-pin 3.5mm stereo earphone
  • the circuit is shown in Figure 2.
  • the lower part of Figure 1 defines the common 4-pin 3.5mm stereo headphone plug.
  • the third pin 03 of the original 3-pin headphone is divided into the third pin 3 and the fourth pin 4 of the 4-pin headphone.
  • the 4-pin headphones have two different pin definitions.
  • the mechanical dimensions of the two headphone plugs are the same.
  • 4-pin 3.5mm earphones are commonly used in mobile phones and other devices.
  • One new pin is generally defined as a microphone or a microphone.
  • the open mobile terminal platform OMTP, Open Mobile Terminal Platform
  • Standards and commonly used standards in North America These two standards
  • the definition of the first pin 1 and the second pin 2 of the plug is the same, but the third pin 3 and the fourth pin 4 are exactly opposite in the definition of the microphone and the ground, and the OMTP standard is the third pin 3 It is a mic, the fourth pin 4 is ground, and the common standard in North America is that the third pin 3 is ground and the fourth pin 4 is a mic.
  • the OMTP standard 3.5mm headphone circuit diagram is shown in Figure 3.
  • the North American common 3.5mm with microphone headphone circuit diagram is shown in Figure 4.
  • SL is the headphone left channel speaker
  • SR is the right channel speaker
  • XI is the headphone plug
  • Mic is the microphone
  • K1 is a button for answering and making calls.
  • the button K1 is used to answer and hang up the phone.
  • a circuit consisting of capacitors Cl, C2 and inductor L1 is used to eliminate RF interference during a call. Zener diode D1 is used to protect Mic.
  • the microphone used in the earphone is generally an electret microphone.
  • the internal schematic diagram of the electret microphone is shown in Figure 5.
  • the electret microphone is composed of an electret and a dedicated FET.
  • the electret realizes the sound. Electric conversion function. Since the output impedance of the electret is very high and cannot be directly matched with the audio amplifier, impedance conversion is performed by a field effect transistor.
  • a diode is compounded between the gate and the source of the FET, and the function of the diode is to protect the FET when it is impacted.
  • Figure 6 shows the audio lines with 3.5mm male ends on both ends. In actual use, there is a 3.5mm male head and the other end is a 3.5mm female or other audio connector.
  • the technical problem to be solved by the present invention is to provide an earphone interface adaptive circuit that can automatically recognize the type of earphone inserted and adjust the audio parameters to match the use of the type of earphone.
  • the earphone interface adaptive circuit is installed in an electronic device supporting a 4-pin earphone socket, the circuit comprising: a control module, a headphone type identification module and a selection switch module, wherein
  • the earphone type identification module is connected to the microphone interface of the electronic device, and is configured to detect a microphone bias current of the earphone device inserted into the earphone socket of the electronic device, and send the signal to the control module;
  • the control module identifies the earphone type device inserted into the earphone socket of the electronic device according to the microphone bias current, and controls the selection switch module to connect the third pin and the fourth pin of the earphone socket of the electronic device to the microphone interface and the ground of the electronic device respectively Or respectively connected to the ground and the microphone interface of the electronic device, and configure corresponding audio channels for the earphone type device.
  • the earphone type identification module includes a series current detecting circuit and a bias resistor, wherein the detected microphone bias current is Imic, the electret microphone bias voltage is Mic-bias, and the diode of the electret microphone is guided.
  • the pass voltage is Vf;
  • the selection switch module connects the third pin and the fourth pin of the earphone socket to the microphone interface and the ground respectively, and is matched with the OMTP standard 4-pin earphone by default, and the control module inserts the electronic device according to the microphone bias current pair.
  • the headset device of the device's headphone jack is identified, including the following:
  • the current detection circuit detects 100 ⁇ A Imic ⁇ 500 ⁇ A, it recognizes that the OMTP standard 4-pin headphone plug is inserted;
  • the current detecting circuit detects 0.9 ( Mic - bias - Vf ) / R5 ⁇ Imic ⁇ lK Mic - bias - Vf ) / R5 , it recognizes that the plug is a standard 4 - foot headphone plug in North America, and R5 is a bias resistor;
  • the current detection circuit detects Imic > 1.1 (Mic-bias-Vf) / R5, it recognizes that the three-legged headphone device is inserted.
  • control module connects the third pin and the fourth pin of the earphone socket of the electronic device to the microphone interface and the ground of the electronic device or to the ground of the electronic device respectively according to the microphone bias current control selection switch module.
  • the microphone, and configuring the corresponding audio channel for the earphone device specifically includes:
  • control module configures an audio channel for the inserted headset device in accordance with the OMTP standard
  • the control module controls the selection switch module to connect the third pin and the fourth pin of the earphone socket of the electronic device respectively The ground and the mic interface of the electronic device, and then the audio channel is configured for the inserted earphone device according to the commonly used standard in North America;
  • the control module configures an audio channel for the inserted three-pin headphones type device.
  • the earphone type identification module includes a series current detecting circuit and a bias resistor, wherein the detected microphone bias current is Imic, the electret microphone bias voltage is Mic-bias, and the diode of the electret microphone is guided.
  • the pass voltage is Vf;
  • the selection switch module connects the third pin and the fourth pin of the headphone jack to the ground and microphone interfaces respectively.
  • the default is to adapt to the North American standard 4-pin headphone, and the control module is inserted according to the microphone bias current pair.
  • the earphone-type device of the earphone socket of the electronic device is identified, including the following situations:
  • the current detection circuit detects 100 microamps of Imic ⁇ 500 microamps, it recognizes that the plug-in is a commonly used standard 4-pin headphone plug in North America; When the current detecting circuit detects 0.9 ( Mic - bias - Vf ) / R5 ⁇ Imic ⁇ lK Mic - bias - Vf ) / R5, it recognizes that the OMTP standard 4-pin headphone plug is inserted, and R5 is a bias resistor;
  • control module connects the third pin and the fourth pin of the earphone socket of the electronic device to the microphone interface and the ground of the electronic device or to the ground of the electronic device respectively according to the microphone bias current control selection switch module.
  • the microphone, and configuring the corresponding audio channel for the earphone device specifically includes:
  • control module configures an audio channel for the inserted headset device according to the commonly used standards in North America;
  • the control module controls the selection switch module to connect the third pin and the fourth pin of the earphone socket of the electronic device respectively a microphone interface and a ground of the electronic device, and then configuring an audio channel for the inserted earphone device according to the OMTP standard;
  • the control module configures an audio channel for the inserted three-pin headphones type device.
  • the circuit further includes a three-legged earphone type device identification module
  • the three-legged earphone type device identification module includes a second resistor and a fourth resistor connected in series, and an operating voltage
  • VDD is grounded through the second resistor and the fourth resistor in turn, the first pin or the second pin of the earphone socket of the electronic device, and the second control end of the control module are connected between the second resistor and the fourth resistor, the control module
  • the highest voltage of the second control terminal input is VDD x ( R4//Re ) / ( R2+ R4//Re ), R2 is the second resistor, R4 is the fourth resistor, and Re is the 3-pin headphone speaker impedance. ;
  • the control module configures an audio channel for the inserted three-leg headphone device, which specifically includes: When the second control terminal of the control module is input low, the earphone socket of the electronic device is a 3-pin earphone, and the control module configures an audio channel for the inserted 3-pin earphone;
  • the 3-pin audio cable is inserted into the earphone socket of the electronic device, and the control module configures the audio channel for the inserted 3-pin audio cable.
  • the circuit further includes a device insertion detection module
  • the device insertion detecting module includes a first resistor and a third resistor, and the working voltage VDD is connected to the sixth pin of the earphone socket of the electronic device through the first resistor, and the first pin of the earphone socket of the electronic device is grounded through the third resistor, and the control module is The first control end is connected to the sixth pin of the earphone socket, and the highest voltage input to the first control terminal is low level is ⁇ 00 1 3/ (1 1+1 3 ), R1 is the first resistance, and R3 is the third Resistance
  • the first pin and the sixth pin of the earphone socket of the electronic device are in contact, and the first control end of the control module is at a low level;
  • the first pin and the sixth pin of the earphone socket of the electronic device are separated, and the first control end of the control module is at a high level.
  • the circuit further includes a device insertion detection module
  • the device insertion detecting module includes a first resistor and a third resistor, the working voltage VDD is connected to the fifth pin of the earphone socket of the electronic device through the first resistor, and the second pin of the earphone socket of the electronic device is grounded through the third resistor, and the control module is The first control terminal is connected to the fifth pin of the earphone socket, and the highest voltage input to the first control terminal is low level is ⁇ 00 1 3/ (1 1+1 3 ), R1 is the first resistance, and R3 is the third Resistance
  • the second pin and the fifth pin of the earphone socket of the electronic device are in contact, and the first control end of the control module is at a low level
  • the second pin and the fifth pin of the earphone socket of the electronic device are separated, and the first control end of the control module is at a high level.
  • the control module detects that the first control port is high through the device insertion detection module At the level, the electret microphone bias voltage is turned on and input to the earphone type recognition module.
  • control module uses Qualcomm's QSC6155 chip
  • current detecting circuit uses Qualcomm's PM8028 chip
  • control module and the current detecting circuit use a Qualcomm QSC6055 chip
  • the selector switch module is a controllable double pole double throw switch.
  • the present invention has at least the following advantages:
  • the earphone interface adaptive circuit of the invention is installed in an electronic device supporting a 4-pin headphone socket, and the control module detects the microphone bias current detected by the earphone type identification module to be inserted into the OMTP standard 4-pin earphone, and the commonly used standard in North America.
  • the 4-pin earphone is also a 3-pin stereo earphone or a 3-pin audio cable.
  • the control module can exchange the connection relationship between the electronic device earphone socket and the microphone interface and the ground signal by controlling the selection switch module, so that the earphone interface adaptive circuit can be Switch between the inserted OMTP interface headset or the North American common interface headset, and support both headsets.
  • the circuit of the present invention is applied to an electronic device such as a mobile phone, so that the earphone interface of the device such as a mobile phone can automatically recognize the earphone type, and automatically adjust the interface circuit and the audio channel according to the recognized earphone type to adapt to the inserted earphone type device.
  • Figure 1 shows a comparison of the structure of a 3-pin 3.5mm headphone connector and a 4-pin 3.5mm headphone connector
  • Figure 2 is a circuit diagram of a 3-pin stereo headset
  • Figure 3 shows the OMTP pin definition 4-pin stereo headphone circuit diagram
  • Figure 4 shows the four-pin stereo headphone circuit diagram for common pin definitions in North America
  • FIG. 5 is an internal circuit diagram of the electret microphone
  • Figure 6 is a schematic diagram of the structure of a dual male stereo audio line
  • FIG. 7 is a schematic diagram of an adaptive circuit of a headphone interface according to a first embodiment of the present invention.
  • FIGS. 9( a ) and ( b ) are respectively equivalent circuit diagrams of the three-legged earphone type device identification module when the 3-pin audio cable and the 3-pin earphone are inserted into the earphone socket;
  • FIG. 10 is a schematic diagram of an adaptive circuit of a headphone interface according to a second embodiment of the present invention.
  • FIG. 11 is a schematic diagram of an adaptive circuit of a headphone interface according to a third embodiment of the present invention.
  • FIG. 12 is a schematic diagram of an adaptive circuit of a headphone interface according to a fourth embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments.
  • the earphone interface adaptive circuit of the present invention is installed in a headphone or similar electronic device supporting a 4-pin earphone socket, and is first detected by means of mechanical detection by using a device insertion detecting module. Is there a device plugged in? If a device insertion is detected, the electret microphone bias voltage in the electronic device is turned on and the microphone bias current is detected, and the microphone is forward biased, the microphone reverse biased, and the microphone is shorted to the ground. The bias current is different.
  • the microphone bias current can be used to distinguish whether the OMTP interface earphone, the North American common interface earphone or the 3-pin stereo earphone or the 3-pin audio cable.
  • a controllable double-pole double-throw switch is further introduced, which can control the connection between the earphone socket of the electronic device and the microphone interface and the ground signal of the electronic device, so that the earphone interface adaptive circuit can be based on the inserted OMTP interface earphone. Or switch between the commonly used interface headphones in North America, and support both types of headphones.
  • the 3-pin earphone or the 3-pin audio cable Since the 3-pin earphone or the 3-pin audio cable is inserted, it is equivalent to short-circuiting the microphone interface and the ground on the electronic device, so it cannot be distinguished by the microphone bias current. Because the difference between the 3-pin earphone and the 3-pin audio cable is that the left-right channel of the 3-pin earphone has a relationship with the ground, and the impedance to the ground is generally 32 ohms. The impedance of the left and right channels of the 3-pin audio cable is infinite when the other end of the 3-pin audio cable is not connected to a car audio or audio amplifier, even if the other end of the 3-pin audio cable has been connected to the car audio or audio.
  • a three-legged headphone device identification module is designed to determine the magnitude of the left or right channel ground resistance to determine whether the inserted device is a 3-pin earphone or a 3-pin audio cable.
  • the method described in this manual is based on a 3.5mm headphone device for mobile phones, but is not limited to mobile phones and 3.5mm headphones.
  • FIG. 7 is an adaptive circuit diagram of a headphone interface in the embodiment, the headphone interface adaptive circuit includes: a device insertion detection module, a control module, a headphone type identification module, a selection switch module, and a three-leg headphone device.
  • the identification module the main controller of the mobile phone or similar electronic device, can use Qualcomm's QSC6155 chip.
  • the headphone jack J1 is a common 4-pin headphone jack.
  • the headphone jack J1 has a fifth pin 5 and a sixth pin 6 in addition to the first pin 1 to the fourth pin 4 pin corresponding to the plug, usually the earphone
  • the first pin 1 of the socket J1 is connected to the left channel interface on the main controller through the first DC blocking capacitor C1
  • the second pin 2 of the headphone socket J1 is connected to the main controller through the second DC blocking capacitor C2.
  • Right channel interface is a common 4-pin headphone jack.
  • the first pin 1 and the sixth pin 6 are in contact internally, and the second pin 2 and the fifth pin 5 are also in contact; when the 4-pin headphone plug is After the headphone jack J1 is inserted, the first pin 1 and the sixth pin 6 are internally separated, and the second pin 5 and the fifth pin 5 are also separated.
  • the device insertion detection module cooperates with the earphone socket J1 to implement the headphone plug detection function.
  • the device insertion detection module includes a first resistor R1 and a third resistor R3.
  • the third resistor R3 is much smaller than the first resistor R1, and the working voltage VDD passes through the first resistor.
  • R1 is connected to the sixth pin 6 of the headphone jack J1, the first pin 1 of the headphone jack J1 is grounded through the third resistor R3, and the first control end H DET1 of the control module is connected to the sixth pin 6 of the headphone jack J1.
  • the equivalent circuit is shown in Figure 8 (a).
  • the main controller of the mobile phone or similar electronic device can determine whether a device is inserted by identifying the level of the first control terminal H DET1.
  • the main controller detects that the first control port H_DET1 is high through the device insertion detection module, the microphone bias voltage Mic-bias power is turned on and input to the earphone type identification module.
  • the values of the first resistor R1 and the third resistor R3 in Figures 7 and 8 can mainly consider two points:
  • the first resistor R1 and the third resistor R3 are both larger, generally 10K ohms or more, so that the circuit operating current will be smaller;
  • the earphone type identification module includes a current detecting circuit D2 and a biasing resistor R5 connected in series in FIG.
  • the current detection circuit D2 uses Qualcomm's PM8028 chip, and the bias resistor R5 is used to supply the appropriate voltage to the FET drain in the electret microphone.
  • Mic-bias is the bias voltage provided by the mobile device and other similar electronic devices to the electret microphone.
  • the third DC blocking capacitor C3 is the main controller microphone port.
  • the value of the bias resistor R5 is generally close to the output impedance of the electret microphone.
  • the commonly used microphone output impedance of the earphone is 2.2K ohms, so the bias resistor R5 is also set to 2.2K ohms.
  • the value of the microphone bias voltage Mic-bias is also related to the characteristics of the microphone.
  • the commonly used microphone bias voltage Mic-bias is 2V.
  • the OMTP standard 3.5mm 4-pin headphones and the commonly used standard 3.5mm 4-pin headphones in North America are on the pin definition.
  • the microphone and the ground are exactly the opposite.
  • the ground pin just covers 4 The mic and ground pins of the footphone.
  • the current detection circuit has been integrated in the analog baseband part of many mobile phones, generally no additional design is required, such as Qualcomm's QSC6055 platform and QSC6155+.
  • the PM8028 platform integrates a current-sense circuit to detect the mic bias current.
  • the default state of the double-pole double-throw switch is the fourth pin 4 of the headphone jack J1, and the third pin is connected to the microphone interface Mic.
  • the default is the OMTP standard headphone definition.
  • the current detecting circuit D2 detects the current of the microphone biasing the power source. If the OMTP standard 4-pin earphone is inserted, the microphone is forward-biased, and the forward bias current of the microphone is related to the characteristics of the dedicated FET inside the microphone. The field effect transistor gate voltage is determined in the case of field effect.
  • the tube is a constant current source, basically independent of the external bias voltage Mic-bias and bias resistor R5, generally 100 ⁇ 350 microamperes, the maximum does not exceed 500 microamperes, and the bias current detected by the current detecting circuit D2 is recorded as Imic, if 100 microamps of Imic 500 microamps are detected, it can be judged that the OMTP standard 4-pin earphone is inserted.
  • the main controller configures the audio channel for the inserted earphone-type device according to the OMTP standard.
  • the sending direction is on the earphone. Mike, the receiver is in the direction of the speaker on the headset. After the setup, the phone or similar electronic device can do other processing.
  • the microphone bias current is due to the Zener diode ( Figure 3, Figure 4, D1, the frequently selected model is 1N4737, etc., so the microphone bias current Imic « ( Mic - bias-Vf ) / R5 , where Vf is the forward voltage of the Zener diode, and the normal conduction current If at room temperature is about 1mA, 0.7V about.
  • the fourth pin 4 of Jl is connected to the microphone interface Mic, the third pin 3 is grounded, the microphone is forward biased, and then the audio channel is configured for the inserted earphone type device according to the commonly used standard in North America.
  • the bias resistor R5 2.2K ohm
  • the bias voltage Mic ⁇ bias 2V
  • (0.9 Mic_bias-0.7) /R5 0.9 (2.0-0.7)
  • the maximum value of the bias voltage is 500 ⁇ A.
  • the current range can be relaxed appropriately, that is, when the current detection circuit D2 detects Imic > 1.1 ( Mic_bias- 0.7 ) /R5 , you can think of a 3-pin or 3-pin audio cable.
  • the Imic is usually greater than 750 ⁇ A at this time and is in the short-circuit current range, it will affect the standby time, so it is better to turn off the Mic-bias power supply.
  • Imic is not in the above range, then an unrecognized device is inserted.
  • a pop-up window on the phone prompts the user not to recognize the inserted device.
  • the phone can do other processing.
  • the three-pin earphone type device recognition module composed of the second resistor R2 and the fourth resistor R4 can be used to distinguish whether it is a 3-pin earphone or a 3-pin audio cable, and the second resistor R2 is much smaller than the fourth resistor R4.
  • a 3-pin earphone or a 3-pin audio cable is inserted, that is, the third pin 3 of the 3-pin earphone or the 3-pin audio cable plug of FIG. 2 or FIG. 6 and the third pin 3 and the third pin of the headphone jack J1 of FIG.
  • Four-pin 4 simultaneous contact the second pin 2 of the 3-pin audio or 3-pin audio cable plug and the second pin 2 of the headphone jack J1, the first pin 1 of the 3-pin audio or 3-pin audio cable plug
  • the first pin 1 of the headphone jack J1 is in contact.
  • the working voltage VDD is grounded through the second resistor R2 and the fourth resistor R4 in sequence, the earphone socket
  • the second pin 2 of J1 and the second control terminal H_DET2 of the main controller are both connected between the second resistor R2 and the fourth resistor R4.
  • the equivalent circuit of the second control terminal H-DET2 of the main controller is as shown in Fig. 9(a), because The second resistor R2 is much smaller than the fourth resistor R4, so the second control terminal H_DET2 of the main controller is at a high level.
  • a resistor equivalent to 32 ohms is connected between the second pin 2 of the headphone jack J1 and the ground, that is, the 3-pin headphone speaker impedance Re, and the three-leg headphone type device at this time
  • the partial equivalent circuit of the identification module connected to the second control terminal H_DET2 is as shown in FIG. 9(b), and the parallel resistance of the 3-pin earphone speaker impedance Re and the fourth resistor R4 is much smaller than the second resistance R2, and the second Control terminal H - DET2 is low.
  • the second control terminal H_DET2 it can be distinguished whether the 3-pin earphone or the 3-pin audio cable is inserted.
  • the highest voltage that ensures that the second control terminal H_DET2 of the main controller is low is VDD ( R4//Re ) / ( R2+ R4//Re ), where all values above this value are input high, including when no device is plugged in and when the 3-pin audio line is plugged in, the second control input is averaged between VDD ( R4//Re )/( R2+ R4/// Between Re) and VDD x ( R4 ) / ( R2+ R4 ), R4//Re is the parallel resistance of the fourth resistor and the 3-pin headphone speaker impedance Re.
  • the second resistor R2 47K ohms
  • the 3-pin earphone is inserted into the earphone socket of the electronic device, and the control module configures an audio channel for the inserted 3-pin earphone, so that the mobile phone and the like are in the process of talking.
  • the microphone on the phone when sending, and use the headphone jack when receiving. Next, you can do other processing of the phone.
  • the 3-pin audio cable is inserted into the earphone socket of the electronic device, and the control module needs to configure an audio channel for the inserted 3-pin audio cable.
  • Make the mobile phone and other similar electronic devices use the microphone on the mobile phone during the call, use the earphone interface when receiving, and set the audio parameters to the hands-free mode. After the sound is connected to other large volume devices through the audio cable, the whistle occurs during the call. Self-excited. Then do other processing of the phone.
  • the left channel headphone output interface H-L and the right channel headphone output interface H-R, and the microphone interface Mic are connected to the audio interface of the headphone type electronic device main controller.
  • the second embodiment of the present invention is substantially the same as the first embodiment, and the difference is:
  • connection detection module and the three-pin headphone type device identification module are connected with the pins of the headphone socket J1;
  • Double-pole double-throw switch The initial default state of D1.
  • the earphone interface adaptive circuit includes: a device insertion detection module, a control module, a headphone type identification module, a selection switch module, and a three-leg headphone device identification module, and the control module is a mobile phone. Or the main controller of similar electronic equipment, you can use Qualcomm's QSC6055 chip.
  • the device insertion detection module cooperates with the earphone socket J1 to implement the headphone plug detection function.
  • the device insertion detection module includes a first resistor R1 and a third resistor R3.
  • the third resistor R3 is much smaller than the first resistor R1, and the working voltage VDD passes through the first resistor.
  • R1 is connected to the fifth pin 5 of the headphone jack J1, the second pin 2 of the headphone jack J1 is grounded through the third resistor R3, and the first control end H DET1 of the control module is connected to the fifth pin 5 of the headphone jack J1.
  • the main controller of the mobile phone or similar electronic device can determine whether a device is inserted by identifying the level of the first control terminal H DET1. When the main controller is plugged in through the device When the detection module detects that the first control port H_DET1 is at a high level, the microphone bias voltage Mic_bias is turned on and input to the earphone type identification module.
  • the values of the first resistor R1 and the third resistor R3 in Fig. 10 and Fig. 8 can mainly consider two points:
  • the first resistor R1 and the third resistor R3 are both larger, generally 10K ohms or more, so that the circuit operating current will be smaller;
  • the earphone type identification module includes the current detecting circuit D2 and the bias resistor connected in series in FIG.
  • the function of the current detecting circuit D2 is also performed by Qualcomm as the main controller.
  • the QSC6055 chip is used to complete the bias resistor R5 to provide the appropriate voltage to the FET drain in the electret microphone.
  • Mic-bias is the bias voltage provided by the mobile device and other similar electronic devices to the electret microphone.
  • the third DC blocking capacitor C3 is the DC blocking capacitor of the main controller microphone port Mic. Bias resistor
  • the value of R5 is generally close to the output impedance of the electret microphone.
  • the commonly used microphone output impedance of the earphone is
  • the bias resistor R5 is also set to 2.2K ohms.
  • Mic-bias is also related to the characteristics of the microphone.
  • the commonly used microphone bias voltage Mic-bias is 2V.
  • the OMTP standard 3.5mm 4-pin headphones and the commonly used standard 3.5mm 4-pin headphones in North America are on the pin definition.
  • the microphone and the ground are exactly the opposite.
  • the ground pin just covers 4 The mic and ground pins of the footphone.
  • a controllable double-pole double-throw switch chip D 1 and a current detecting circuit D2 are introduced to realize the detection of the earphone type.
  • the current detecting circuit is integrated in the analog baseband portion of many mobile phones, and generally does not require an additional design, such as QSC6055 in Qualcomm. Both the platform and the QSC6155+PM8028 platform integrate current sensing A circuit that detects the mic bias current.
  • the default state of the double-pole double-throw switch is the fourth pin of the headphone jack J1. 4 is connected to the microphone interface Mic, and the third pin is grounded to the ground. The default is the standard definition of the standard headphones in North America.
  • the current detecting circuit D2 detects the current of the microphone biasing the power source. If you insert a commonly used standard 4-pin earphone in North America, the microphone is forward-biased. The forward bias current of the microphone is related to the characteristics of the dedicated FET inside the microphone.
  • the field The effect tube is a constant current source, and the basic and external bias voltages Mic-bias and bias resistor R5 are independent, generally 100 ⁇ 350 microamperes, and the maximum is less than 500 microamperes, and the bias current detected by the current detecting circuit D2 is recorded.
  • the main controller configures an audio channel for the inserted earphone-type device according to the commonly used standards in North America.
  • the microphone on the earphone receives the direction of the speaker on the earphone. After the setup, the phone or similar electronic device can do other processing.
  • the microphone bias current is due to the diode between the gate and the source of the FET, so the microphone
  • the bias current Imic - ( Mic - bias - Vf ) / R5 where Vf is the turn-on voltage of the diode and is about 0.7V.
  • the bias resistor R5 2.2K ohms
  • the bias voltage Mic bias 2V
  • Imic is usually greater than 750 ⁇ A at this time and is in the short-circuit current range, it will affect the standby time, so it is best to turn off the Mic-bias power supply.
  • Imic is not in the above range, then an unrecognized device is inserted.
  • a pop-up window on the phone prompts the user not to recognize the inserted device.
  • the phone can do other processing.
  • the three-leg headphone type device recognition module composed of the second resistor R2 and the fourth resistor R4 can be used to distinguish whether it is a 3-pin earphone or a 3-pin audio cable, and the second resistor R2 is much smaller than the fourth resistor R4.
  • the working voltage VDD is grounded through the second resistor R2 and the fourth resistor R4 in turn, and the first pin 1 of the headphone jack J1 and the second control end H_DET2 of the main controller are connected to the second resistor R2 and the fourth resistor R4. between.
  • the equivalent circuit of the second control terminal H-DET2 of the main controller is as shown in Fig. 9(a), because The second resistor R2 is much smaller than the fourth resistor R4, so the second control terminal H_DET2 of the main controller is at a high level.
  • a resistor equivalent to 32 ohms is connected between the second pin 2 of the headphone jack J1 and the ground, that is, the 3-pin earphone speaker impedance Re, at this time, the three-legged earphone
  • the partial equivalent circuit of the class device identification module and the second control terminal H-DET2 is as shown in FIG. 9(b), and the parallel resistance value of the 3-pin earphone speaker impedance Re and the fourth resistor R4 is much smaller than the second resistance R2.
  • the second control terminal H_DET2 is at a low level.
  • the second control terminal H_DET2 it can be distinguished whether the 3-pin earphone or the 3-pin audio cable is inserted.
  • the highest voltage that ensures that the second control terminal H_DET2 of the main controller is low is VDD ( R4//Re ) / ( R2+ R4//Re ), where all values above this value are input high, including when no device is plugged in and when the 3-pin audio line is plugged in, the second control input is averaged between VDD ( R4//Re )/( R2+ R4// Re ) and VDD ( R4 ) / ( R2+ R4 ).
  • the second resistor R2 47K ohms
  • the 3-pin earphone is inserted into the earphone socket of the electronic device, and the control module configures an audio channel for the inserted 3-pin earphone, so that the mobile phone and the like are in the process of talking.
  • the microphone on the phone when sending, and use the headphone jack when receiving. Next, you can do other processing of the phone.
  • the control module When the second control terminal H_DET2 of the control module is input to a high level, the 3-pin audio cable is inserted into the earphone socket of the electronic device, and the control module needs to configure an audio channel for the inserted 3-pin audio cable, so that the mobile phone and the like are in the electronic device.
  • the microphone on the mobile phone is used for sending, and the earphone interface is used for receiving.
  • the audio parameter is set to the hands-free mode. After the sound is connected to other large volume devices through the audio cable, the whistling self-excitation occurs during the call. Then do other processing of the phone.
  • the third embodiment of the present invention is substantially the same as the first embodiment.
  • the earphone interface adaptive circuit of the embodiment does not include the device insertion detecting module.
  • the earphone interface adaptive circuit only Including: control module, earphone type identification module, selection switch module and three-leg headphone type device identification module.
  • the microphone bias voltage Mic bias needs to be turned on for a long time. Once a device is inserted into the earphone socket J1, the microphone bias current can be detected.
  • the disadvantage is that the power consumption is relatively high, which may cause the standby time of the mobile phone to be shortened.
  • the fourth embodiment of the present invention is substantially the same as the first embodiment.
  • the headset interface adaptive circuit of the embodiment does not include a three-legged headset device identification module.
  • the headset interface is adaptive.
  • the circuit only includes: a device insertion detection module, a control module, a headphone type identification module, and a selection switch module.
  • the earphone type identification module recognizes the OMTP standard earphone, the North American common standard earphone, and the three-leg earphone type device, it is impossible to further distinguish whether the three-legged earphone type device is a 3-pin earphone or a 3-pin audio cable. Therefore, the present implementation
  • the headphone interface adaptive circuit described in the example is only applicable to the case of only the 4-pin OMTP standard earphone and the North American standard standard earphone.
  • the earphone interface adaptive circuit of the invention is installed in an electronic device supporting a 4-pin headphone jack, and the control module detects the microphone bias current detected by the current detecting circuit to be inserted into the OMTP standard 4-pin earphone, and the North American common standard 4
  • the footphone is also a 3-pin stereo earphone or a 3-pin audio cable.
  • the control module can exchange the connection relationship between the electronic device earphone socket and the microphone interface and the ground signal by controlling the selection switch module, so that the earphone interface adaptive circuit can be The inserted OMTP interface headset or the North American common interface headset is switched, and both headsets are supported.
  • the circuit of the present invention is applied to an electronic device such as a mobile phone, so that the earphone interface of the device such as a mobile phone can automatically recognize the type of the earphone, and automatically adjust the interface circuit and the audio channel according to the recognized type of the earphone to adapt to the inserted earphone type device.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Headphones And Earphones (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Stereophonic Arrangements (AREA)
  • Telephone Function (AREA)

Abstract

La présente invention se rapporte à un circuit adaptatif d'une interface d'écouteur. Le circuit selon l'invention est monté dans un dispositif électronique prenant en charge une prise d'écouteur à quatre broches. Un module de contrôle détermine que l'écouteur branché est : un écouteur à quatre broches conforme à la norme Open Mobile Terminal Platform (OMTP) ; un écouteur à quatre broches conforme à une norme couramment employée en Amérique du Nord ; un écouteur stéréophonique à trois broches ; ou un câble audio à trois broches. Cette détermination est basée sur un courant de polarisation de microphone détecté par un module de détection de courant. En contrôlant un module de commutation sélective, le module de contrôle exécute une commutation, de la relation de connexion entre la prise de l'écouteur et une interface de microphone à la relation de connexion entre la prise de l'écouteur et un signal de mise à la masse, et vice versa. De cette manière, le circuit adaptatif de l'interface de l'écouteur exécute une commutation sur la base du fait que l'écouteur branché est un écouteur conforme à la norme OMTP ou que l'écouteur branché est un écouteur conforme à une norme couramment employée en Amérique du Nord. D'autre part, le circuit adaptatif de l'interface de l'écouteur est apte à prendre en charge les deux types d'écouteurs. En mettant en œuvre le circuit de la présente invention dans un dispositif électronique (un combiné téléphonique, par exemple, etc.), l'interface d'écouteur du dispositif (un combiné téléphonique, par exemple, etc.) peut identifier automatiquement le type de l'écouteur. L'interface d'écouteur du dispositif peut en outre régler automatiquement le circuit d'interface ainsi que les canaux audio, de sorte à s'adapter au type d'écouteur branché dans le dispositif en fonction du type d'écouteur identifié.
PCT/CN2011/073199 2010-09-07 2011-04-22 Circuit adaptatif d'une interface d'écouteur WO2012031481A1 (fr)

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CN103379401A (zh) * 2012-04-25 2013-10-30 国基电子（上海）有限公司 通过耳机接口供电的供电系统、电子装置及耳机电源线
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CN104105046A (zh) * 2013-04-09 2014-10-15 宏碁股份有限公司 检测电路
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TWI563856B (en) * 2014-02-27 2016-12-21 Merry Electronics Co Ltd Mobile device and corresponding noise-canceling earphone
CN104093114A (zh) * 2014-07-22 2014-10-08 Tcl通讯（宁波）有限公司 一种耳机按键的检测装置、检测系统及检测方法
CN104093114B (zh) * 2014-07-22 2018-03-16 Tcl通讯（宁波）有限公司 一种耳机按键的检测装置、检测系统及检测方法
EP3220658A4 (fr) * 2014-11-14 2017-11-15 ZTE Corporation Procédés et circuits permettant une reconnaissance et une connexion d'écouteur et support de stockage
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