CN111182417A - Audio interface adaptation circuit, data line and audio equipment - Google Patents

Audio interface adaptation circuit, data line and audio equipment Download PDF

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Publication number
CN111182417A
CN111182417A CN202010038238.9A CN202010038238A CN111182417A CN 111182417 A CN111182417 A CN 111182417A CN 202010038238 A CN202010038238 A CN 202010038238A CN 111182417 A CN111182417 A CN 111182417A
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China
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pin
detection
transistor
switch
control
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CN202010038238.9A
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CN111182417B (en
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谢奕
周向军
李露
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Shenzhen Aitushi Innovation Technology Co ltd
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Aputure Imaging Industries Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • 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
    • H04R29/00—Monitoring arrangements; Testing arrangements
    • H04R29/004—Monitoring arrangements; Testing arrangements for microphones

Abstract

The invention discloses an audio interface adaptation circuit, a data line and audio equipment, which comprise a first detection and control module, a second detection and control module, a first switching module and a second switching module, wherein the first switching module is used for receiving audio signal input and is used for connecting a first pin and a second pin of an audio interface; if the first detection and control module and the second detection and control module detect that the third pin has the bias voltage, the first switching module switches the audio signal to the second switching module and switches the audio signal to the third pin for output; if the first and second detection and control modules detect that the fourth pin has bias voltage, the first switching module switches the audio signal to the second switching module and switches the audio signal to the fourth pin for output. The above mode can realize automatic adaptation with different audio interfaces.

Description

Audio interface adaptation circuit, data line and audio equipment
Technical Field
The invention relates to the technical field of audio, in particular to an audio interface adapting circuit, a data line and audio equipment.
Background
The 3.5mm audio frequency interface of the microphone has three TRS or four TRRS, wherein, the four TRRS has two interface standards, one is the national standard (OMTP), the plug connection method (from the small head) is left sound channel-right sound channel-microphone-ground wire; the second is the plug connection method of international standard (CTIA), which is left sound channel-right sound channel-ground wire-microphone. The recording interfaces of the mobile phone and the recording pen are four-section TRRS, and the recording interfaces of the camera are three-section TRS. The recording interface of the camera is arranged at the first end of the TRS. The signal output of the microphone corresponds to the input interface of the recording equipment to record normally.
Because there are different types of audio interfaces, the prior art cannot adapt to multiple (e.g., three, etc.) types of audio interfaces simultaneously, so that transmission of audio signals cannot be performed normally, and therefore it is a technical problem to be solved urgently to design a product capable of automatically adapting to multiple types of audio interfaces.
Disclosure of Invention
In order to solve the above-mentioned defects in the prior art, the present invention provides an audio interface adaptation circuit, a data line and an audio device.
The invention adopts a technical scheme that: an audio interface adaptation circuit is provided, comprising: a first and a second detection and control module, a first and a second switching module,
the first switching module is used for receiving audio signal input and is used for connecting a first pin and a second pin of an audio interface, the first switching module is respectively connected with the first detection and control module and the second switching module, and the second switching module is connected with the second detection and control module;
the first detection and control module is used for connecting a third pin and a fourth pin of an audio interface to detect whether the third pin and the fourth pin have bias voltage or not, the second detection and control module is used for connecting the third pin and the fourth pin of the audio interface to detect whether the third pin and the fourth pin have bias voltage or not, wherein,
if the first and second detection and control modules do not detect that the third and fourth pins have bias voltages, the first switching module switches the audio signal to the first and second pins for output;
if the first and second detection and control modules detect that the third pin has the bias voltage, the first detection and control module controls the first switching module to switch the audio signal to the second switching module, and the second switching module switches the audio signal to the third pin for output;
if the first and second detection and control modules detect that the fourth pin has bias voltage, the first switching module switches the audio signal to the second switching module, and the second switching module switches the audio signal to the fourth pin for output.
In order to solve the above technical problem, another technical solution adopted by the present application is: there is provided a data line comprising the audio interface adaptation circuit provided by the present invention.
In order to solve the above technical problem, another technical solution adopted by the present application is: an audio device is provided, which comprises the audio interface adaptation circuit provided by the invention.
The technical scheme provided by the invention has the beneficial effects that: the audio signal is received through the first switching module, the first detection and control module and the second detection and control module simultaneously detect the third pin and the fourth pin of an audio interface connected with the first detection and control module, if the first detection and control module detects that the third pin and the fourth pin do not have bias voltage, the audio signal is directly transmitted to the first pin and the second pin of the audio interface to be output, and if the first detection and control module detects that one of the third pin and the fourth pin has the bias voltage, the audio signal is switched to the second switching module through the first switching module and is output through the corresponding pin with the bias voltage. Through detecting the pins of different types of audio interfaces, the switching module switches the audio signals to the corresponding audio interface for output, so that automatic adaptation of different audio interfaces can be realized, normal transmission of the audio signals is ensured, software and a high-cost complex central processing chip are not required, and cost is effectively reduced.
Drawings
The invention is described in detail below with reference to examples and figures, in which:
FIG. 1 is a control schematic block diagram of an embodiment of an audio interface adaptation circuit of the present invention;
FIG. 2 is a circuit diagram of an audio interface adaptation circuit according to an embodiment of the present invention;
FIG. 3 is a circuit diagram of a first control module of the audio interface adapter circuit according to an embodiment of the present invention;
FIG. 4 is a circuit diagram of a second control module of the audio interface adapter circuit according to an embodiment of the present invention
FIG. 5 is a schematic diagram of a data line according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a data line according to another embodiment of the present invention;
fig. 7 is a schematic structural diagram of an embodiment of the audio device of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention discloses an audio interface adaptation circuit which can be suitable for a data line, namely the audio interface adaptation circuit can be connected with a plug or a socket of the data line, and the audio interface adaptation circuit can also be positioned in electronic equipment, namely is connected with the socket (seat) and is internally arranged in the electronic equipment.
Referring to fig. 1, a control schematic block diagram of a preferred embodiment is shown, in which the audio interface adaptation circuit includes a first and a second detection and control module, and a first and a second switching module. The first switching module is used for receiving audio signal input and is used for being connected with a first pin and a second pin of an audio interface, the first switching module is respectively connected with the first detection and control module and the second switching module, and the second switching module is connected with the second detection and control module. The first detection and control module is used for connecting a third pin and a fourth pin of an audio interface to detect whether the third pin and the fourth pin have bias voltage, and the second detection and control module is used for connecting the third pin and the fourth pin of the audio interface to detect whether the third pin and the fourth pin have bias voltage. One end of the first detection and control module, one end of the first switching module and one end of the second switching module are respectively connected with the ground wire; the first detection and control module and the second switching module are connected, and one end of the second detection and control module is connected with a power supply end VCC respectively, so that a working power supply can be provided for the whole circuit. The power source VCC may be between 3.3V-5V dc.
It is understood that the audio interface may comprise four pins, i.e. a first pin, a second pin, a third pin, a fourth pin, etc., wherein the first pin and the second pin may be audio pins of the audio interface, e.g. a left channel pin and a right channel pin, respectively. One of the third pin and the fourth pin is used as a microphone pin of the audio interface, and the other pin is used as a grounding pin. For example, the third and fourth pins may be a MIC pin and a GND pin, respectively, or the third and fourth pins may be a GND pin and a MIC pin, respectively. The audio interface may be any TYPE of plug or socket (port), such as a common 3.5mm or 2.5mm headphone plug or socket (port), TYPE-C interface or micro-USB interface, etc.
If the first and second detection and control modules do not detect that the third and fourth pins have bias voltages, the first switching module switches the audio signal to the first and second pins for output. That is, when the first detection and control module detects that neither the third pin nor the fourth pin has the bias voltage, the first detection and control module sends a control signal (for example, a high level or a low level) to the first switching module, and the first switching module switches the audio signal input by the first detection and control module to the first pin and the second pin for output. It is understood that if the third and fourth pins do not have a bias voltage, a TRS mode plug may be connected to the audio interface.
If the first and second detection and control modules detect that the third pin has the bias voltage, that is, the first and second detection and control modules detect that the third pin has the bias voltage and the fourth pin does not have the bias voltage, at this time, the plug connected to the audio interface may be a TRRS plug and is an OMTP (national standard) plug. The first detection and control module sends a control signal (for example, a high level or a low level, etc.) to the first switching module, the first switching module receives the control signal from the first detection and control module to switch the audio signal to the second switching module, and the second detection and control module sends a control signal to the second switching module, and the second switching module receives the control signal to switch the audio signal to the third pin for output.
If the first and second detection and control modules detect that the fourth pin has the bias voltage, that is, the first and second detection and control modules detect that the fourth pin has the bias voltage and the third pin does not have the bias voltage, at this time, the plug connected to the audio interface may be a TRRS-mode plug and is a CTIA (international standard) standard plug. The first detection and control module sends a control signal (for example, a high level or a low level) to the first switching module, the first switching module receives the control signal to switch the audio signal to the second switching module, the second detection and control module sends the control signal to the second switching module, and the second switching module receives the control signal to switch the audio signal to the fourth pin for output.
It will be appreciated that the output in the embodiments of the present application is with respect to the audio signal input from the first switching module. The first switching module and the second switching module may be hardware switches with the same structure and independent from each other, and of course, the first switching module and the second switching module may also be integrated hardware switches.
The invention can simultaneously adapt to three types of audio interfaces of CTIA in TRS and TRRS and OMTP in TRRS, and can realize automatic adaptation of different audio interfaces by detecting pins of different types of audio interfaces and switching the audio signals to the corresponding audio interfaces for output through the switching module, thereby ensuring normal transmission of the audio signals, avoiding the participation of software and a high-cost complex central processing chip and effectively reducing the cost.
In some embodiments, referring to fig. 2 in combination, the first and second switching modules may employ the same structure of the first and second switches U1, U2, respectively, having a power supply terminal (V +), a control terminal SEL, a first input terminal MIC, a second input terminal GND, a first output terminal SLEE, a second output terminal RING. When the control terminal SEL receives a high level, the first input terminal MIC is connected to the first output terminal SLEE, and the second input terminal GND is connected to the second output terminal RING. When the control terminal SEL receives a low level, the first input terminal MIC is connected to the second output terminal RING, and the second input terminal GND is connected to the first output terminal SLEE.
The control end SEL of the first switch U1 is connected with the first detection and control module to receive a control signal thereof, the first input end MIC of the first switch U1 is connected with an audio signal input through a first capacitor C1, the second input end GND of the first switch U1 is grounded, the first output end SLEE of the first switch U1 is connected with the first PIN PIN1 and the second PIN PIN2, wherein the first PIN PIN1 and the second PIN PIN2 are connected with the first output end SLEE in common, and the second output end RING of the first switch U1 is connected with the first input end MIC of the second switch U2;
the control end SEL of the second switch U2 is connected with the second detection and control module to receive a control signal of the second detection and control module, the second input end GND of the second switch U2 is grounded, the first output end SLEE of the second switch is connected with the fourth PIN PIN4, the second output end RING of the second switch U2 is connected with the third PIN PIN3, and the power supply end V + is connected with a power supply VCC.
As shown in fig. 2, the audio interface is a jack (socket), it being understood that the key four PINs are shown by way of example in fig. 2, with a first PIN1 for connecting to the left channel L of the plug, a second PIN2 for connecting to the right channel R of the plug, a third PIN3 for connecting to the M/G of the plug, and a fourth PIN4 for connecting to the M/G of the plug. Of course, the audio interface may also be a plug, and the first output terminal SLEE of the first switch U1, the first output terminal SLEE of the second switch U2, and the second output terminal RING of the above circuit are connected to the plug.
Alternatively, the first switch U1 and the second switch U2 may be hardware switches with different structures, as long as both include the same input/output terminals.
In some embodiments, with continued reference to fig. 2, the first detection and control module includes a first transistor Q1, the first transistor Q1 is an NPN-type transistor, a collector of the first transistor Q1 is connected to one end of a first resistor R1 and a control terminal SEL of the first switch U1, the other end of the first resistor is connected to the dc power supply, an emitter of the first transistor Q1 is grounded, a base of the first transistor Q1 is connected to one end of a first diode D1 and one end of a second diode D2, such as cathodes of the first diode D1 and the second diode D2, the other end of the first diode D1 is connected to the third pin, such as an anode of the first diode D45, and the other end of the second diode D2 is connected to the fourth pin, such as an anode of the second diode D2. It will be appreciated that the first and second diodes described above constitute a simple or gate.
The second detection and control module comprises a second triode Q2 and a third triode Q3, the second triode Q2 adopts a PNP type triode, the third triode Q3 adopts an NPN type triode, the emitter of the second triode Q2 is connected with the third pin through a third resistor R3, the base of the second triode Q2 is connected with the fourth pin through a fifth resistor (R5), the collector of the second triode Q2 is connected with the base of the third triode Q3 through a sixth resistor R6, the emitter of the third triode Q3 is connected with the fourth pin, the collector of the third triode Q3 is connected with one end of a fourth resistor R4 and a control end SEL of a second switch U2, and the other end of the fourth resistor R4 is connected with a direct current power supply.
Because the triode is a current control element, the detected bias voltage can be converted into a current signal by introducing the resistors R1-R6 connected with each triode, and the generation of a control signal is realized.
The working principle of the invention is detailed below with reference to fig. 2:
when the third PIN3 is grounded (G) at a low level (the third and fourth PINs have no bias voltage, i.e., TRS mode), the current flowing through the first diode D1 is at a low level, the current flowing through the second diode D2 is at a low level, the second resistor R2 is connected to the base of the NPN transistor Q1, at this time, the base B of the first transistor Q1 is at a low level, the emitter E is at a low level, the first transistor Q1 functions as a switch, the first transistor Q1 is not turned on, the control terminal SEL of the first switch U1 is at a high level, the first switch U1 is turned on in a manner that the second input terminal GND is connected to the second output terminal ng rie, the first input terminal MIC is connected to the first output terminal SLEE, and the audio signal input by the first switch U1 is output to the first PIN1 and the second PIN2, so that sound recording can be perfectly achieved.
When the third PIN3 is grounded (G) to a low level, the fourth PIN4 is biased to a high level (i.e., CTIA mode in TRRS) with the microphone (M). The current through the first diode D1 is low and the current through the second diode D2 is high. The second resistor R2 is connected at the base of the NPN triode Q1, at the moment, the base B is at a high level, the emitter E is at a low level, the first triode Q1 plays a role of switching, the first triode Q1 is conducted, the control end SEL of the first switch U1 is at a low level, the conduction mode of the first switch U1 is that the second input end GND is connected with the first output end SLEE, the first input end MIC is connected with the second output end RING, and an audio signal is output to the first input end MIC of the second switch U2. The third PIN3 is connected with an emitter (at the time, a low level) of a PNP triode Q2 through R3, the fourth PIN4 is connected with a base (at the time, a high level) of a PNP of a second triode Q2 through a fifth resistor R5, the second triode Q2 is not conducted, at the time, a base B of an NPN of the third triode Q3 is low, a sixth resistor R6 is a base current-limiting resistor, an emitter of the third triode Q3 is connected with the fourth PIN4 and is at the low level, the third triode Q3 is not conducted, a control terminal SEL of the second switch U2 is at the high level, the conduction mode of the second switch U2 is that a second input terminal GND is connected with a second output terminal RING, a first input terminal MIC is connected with a first output terminal SLEE, and an audio signal is input to a fourth PIN4 of the TRRS 387, so that recording is perfectly realized.
When the fourth PIN4 is low at ground (G), the third PIN3 is biased high at the microphone (M) (i.e., OMTP mode in TRRS), high through the first diode D1 and low through the second diode D2. The second resistor R2 is connected to the base B of the NPN of the first triode Q1, at this time, the base B is at a high level, the emitter E is at a low level, the first triode Q1 plays a switching role, the first triode Q1 is switched on, the control terminal SEL of the first switch U1 is at a low level, the switching mode of the first switch U1 is that the second input end GND is connected with the first output end SLEE, the first input end MIC is connected with the second output end RING, and the audio signal is output to the first input end MIC of the second switch U2. The third PIN3 is connected to the E pole (at this time, high level) of the PNP of the second transistor Q2 through the third resistor R3, the fourth PIN4 is connected to the base B (at this time, low level) of the PNP of the second transistor Q2 through the fifth resistor R5, the second transistor Q2 is turned on, the base B of the NPN of the third transistor Q3 is high, the sixth resistor R6 is a base current-limiting resistor, the emitter E of the third transistor Q3 is connected to the low level of the PIN4 of the fourth transistor Q3, the third transistor Q3 is turned on, the control terminal SEL of the second switch U2 is low level, the second switch U2 is turned on in a manner that the second input terminal GND is connected to the first output terminal SLEE, the first input terminal MIC is connected to the second output terminal RING, and an audio signal is input to the third PIN3 of the trs, thereby realizing perfect recording.
In some embodiments, referring to fig. 3 in combination, the first detection and control module includes a first MOS transistor Q1 ', which is an N-channel MOS transistor, a drain of the first MOS transistor Q1 ' is connected to the control terminal SEL of the first switch U1 and the dc power supply, a source of the first MOS transistor is grounded, a gate of the first MOS transistor Q1 ' is connected to one end of a first diode D1 and one end of a second diode D2, another end of the first diode D1 is connected to the third PIN3, and another end of the second diode D2 is connected to the fourth PIN 4.
Optionally, with continued reference to fig. 4, the second checking and controlling module includes a second MOS transistor (Q2 ') and a third MOS transistor Q3', the second MOS transistor Q2 'employs a P-channel MOS transistor, the third MOS transistor Q3' employs an N-channel MOS transistor, a drain of the second MOS transistor Q2 'is connected to the third PIN3, a gate of the second MOS transistor Q2' is connected to the fourth PIN, a source of the second MOS transistor Q2 'is connected to the gate of the third MOS transistor Q3', a source of the third MOS transistor Q3 'is connected to the fourth PIN4, and a drain of the third MOS transistor Q2' is connected to the control terminal SEL of the second switch U2 and the dc power supply.
The working principle of the present invention will be described in detail below with reference to fig. 2, 3 and 4:
if the third PIN3 and the fourth PIN4 do not have bias voltage, the first MOS transistor Q1' is not turned on, the control terminal SEL of the first switch U1 is at a high level, the first switch U1 is turned on in a manner that the second input terminal GND is connected to the second output terminal RING, the first input terminal MIC is connected to the first output terminal SLEE, and the audio signal input by the first switch U1 is output to the first PIN1 and the second PIN2, so that recording can be perfectly achieved.
If the third PIN3 has a bias voltage (i.e., high level), and the fourth PIN4 does not have a bias voltage (i.e., low level), the first MOS transistor Q1 ' is turned on, the control terminal SEL of the first switch U1 is low level, the first switch U1 is turned on in such a manner that the second input terminal GND is connected to the first output terminal SLEE, the first input terminal MIC is connected to the second output terminal RING, the audio signal is output to the first input terminal MIC of the second switch U2, the second MOS transistor Q2 ' is turned on, the third MOS transistor Q3 ' is turned on, the control terminal SEL of the second switch U2 is low level, the second switch U2 is turned on in such a manner that the second input terminal GND is connected to the first output terminal SLEE, the first input terminal MIC is connected to the second output terminal RING, and the audio signal is input to the third PIN3 of the PIN TRRS, thereby achieving perfect recording.
If the fourth PIN4 has a bias voltage (i.e., a high level), and the third PIN3 does not have a bias voltage (i.e., a low level), the first MOS transistor Q1 ' is turned on, the control terminal SEL of the first switch U1 is a low level, the first switch U1 is turned on in such a manner that the second input terminal GND is connected to the first output terminal SLEE, the first input terminal MIC is connected to the second output terminal RING, the audio signal is output to the first input terminal MIC of the second switch U2, the second MOS transistor Q2 ' is not turned on, the third MOS transistor Q3 ' is not turned on, the control terminal SEL of the second switch U2 is a high level, the second switch U2 is turned on in such a manner that the second input terminal GND is connected to the second output terminal RING, the first input terminal MIC is connected to the first output terminal SLEE, and the audio signal is input to the fourth PIN4 of the PIN TRRS, thereby achieving perfect recording.
Because the MOS tube is a voltage control element, a resistor can be omitted, and the detected bias voltage can be converted into a control signal by directly using the MOS tube. The mode effectively reduces the use of parts, reduces the power consumption influence caused by resistance, and effectively improves the working efficiency of the audio interface adaptation circuit.
It can be understood that the first detection and control module and the second detection and control module in the audio interface adaptation circuit of the present invention may all be a combination of a triode and a resistor, the first detection and control module and the second detection and control module may also all be MOS transistors, and of course, the first detection and control module and the second detection and control module may also be a common combination of a triode and an MOS transistor.
In summary, the audio interface adaptation circuit of the present invention is composed of simple hardware such as a triode, a mos transistor, and a switch, and does not need to use a central processing Unit (MCU) or a single chip microcomputer or other chips with complex interfaces, which effectively reduces the cost, and does not need to introduce software programs, such as code flushing to control the operations of timing sequence, analog-to-digital conversion, and interface conversion.
The invention discloses an audio interface adaptation method, which specifically comprises the following steps: detecting whether a third pin or a fourth pin of the audio plug has bias voltage, if one of the third pin or the fourth pin has the bias voltage, entering a TRRS (trunk radio frequency) connection mode, and if no bias voltage exists, entering a TRS (trunk radio frequency) connection mode; if the bias voltage is detected on the third pin, adopting an OMTP standard of a TRRS connection mode; and if the bias voltage is detected on the fourth pin, adopting the CTIA standard of a TRRS connection mode.
Setting a first detection module, a second detection module, a first switching module and a second switching module; detecting whether a third pin or a fourth pin of the audio plug has bias voltage by using the first detection and control module, if one of the third pin or the fourth pin has the bias voltage, controlling the first switching module to switch and connect the audio signal to the third pin or the fourth pin of the audio plug, and if no bias voltage exists, controlling the first switching module to switch and connect the audio signal to a first section and a second section of the audio plug; and the second detection and control module is used for detecting whether a third pin and a fourth pin of the audio plug have bias voltage, if the third pin has the bias voltage, the second switching module is controlled to switch and connect the audio signal to the third pin, and if the fourth pin has the bias voltage, the second switching module is controlled to switch and connect the audio signal to the fourth pin.
Referring to fig. 5 and 6, the present invention discloses a data line 200 (200'), the data line 200 includes the audio interface adapting circuit 100 described in the above embodiment, as shown in fig. 5, one end of the data line 200 may be a TYPE-C plug, the other end may be a four-segment headphone plug with a diameter of 3.5mm, for example, and an audio signal may be input from the TYPE-C plug or from the headphone plug, wherein the audio interface adapting circuit 100 may be disposed inside a housing including the TYPE-C end or inside a housing including the headphone plug end; as shown in fig. 6, the data line 200 may have TYPE-C plugs at both ends, and the audio interface adaptation circuit 100 may set one of the TYPE-C plugs. Of course, the circuit may be disposed between two ends of the data line through the housing, and for the specific content of the audio interface adapting circuit 100, reference may be made to the description of the above embodiments, which is not described herein again.
Referring to fig. 7, the present invention discloses an audio device 300, and the audio device 300 includes the audio interface adaptation circuit 100 according to the above embodiment. The audio device 300 may be provided with a socket, and the audio interface adapter circuit 100 is connected to pins of the socket. The audio device may be a microphone, a power amplifier, a sound box, a multimedia console, a digital sound console, an audio sampling card, a synthesizer, a middle-high frequency sound box, a microphone, a sound receiving and amplifying system, a smart phone capable of playing music, and the like.
The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.

Claims (10)

1. An audio interface adapting circuit is characterized by comprising a first detection module, a second detection module, a first switching module and a second switching module,
the first switching module is used for receiving audio signal input and is used for connecting a first pin and a second pin of an audio interface, the first switching module is respectively connected with the first detection and control module and the second switching module, and the second switching module is connected with the second detection and control module;
the first detection and control module is used for connecting a third pin and a fourth pin of an audio interface to detect whether the third pin and the fourth pin have bias voltage or not, the second detection and control module is used for connecting the third pin and the fourth pin of the audio interface to detect whether the third pin and the fourth pin have bias voltage or not, wherein,
if the first and second detection and control modules do not detect that the third and fourth pins have bias voltages, the first switching module switches the audio signal to the first and second pins for output;
if the first and second detection and control modules detect that the third pin has the bias voltage, the first detection and control module controls the first switching module to switch the audio signal to the second switching module, and the second switching module switches the audio signal to the third pin for output;
if the first and second detection and control modules detect that the fourth pin has bias voltage, the first switching module switches the audio signal to the second switching module, and the second switching module switches the audio signal to the fourth pin for output.
2. The audio interface adaptation circuit of claim 1, wherein the first and second pins serve as audio pins, one of the third and fourth pins serves as a microphone pin of the audio interface, and the other serves as a ground pin.
3. Audio interface adaptation circuit according to claim 2, characterized in that the first and second switching modules comprise a first and a second switch (U1, U2), respectively, the first and second switch (U1, U2) having a control terminal (SEL), a supply terminal (V +), a first input terminal (MIC), a second input terminal (GND), a first output terminal (SLEE), a second output terminal (RING),
when the control terminal (SEL) receives a high level, the first input terminal (MIC) is connected with the first output terminal (SLEE), the second input terminal (GND) is connected with the second output terminal (RING),
when the control terminal (SEL) receives a low level, the first input terminal (MIC) is connected with the second output terminal (RING), and the second input terminal (GND) is connected with the first output terminal (SLEE);
the control end (SEL) of the first switch (U1) is connected with the first detection and control module to receive a control signal of the first detection and control module, the first input end (MIC) of the first switch (U1) is connected with an audio signal input through a first capacitor (C1), the second input end (GND) of the first switch (U1) is grounded, the first output end (SLEE) of the first switch (U1) is connected with the first and second PINs (PIN 1 and PIN 2), and the second output end (RING) of the first switch is connected with the first input end (MIC) of the second switch (U2);
the control end (SEL) of the second switch (U2) is connected with the second detection and control module to receive a control signal of the second detection and control module, the second input end (GND) of the second switch (U2) is grounded, the first output end (SLEE) of the second switch is connected with the fourth PIN (PIN 4), the second output end (RING) of the second switch (U2) is connected with the third PIN (PIN 3), and the power supply end (V +) is connected with a power supply VCC.
4. The audio interface adaptation circuit of claim 3, wherein the first detection and control module comprises a first transistor (Q1), the first transistor (Q1) is an NPN transistor, a collector of the first transistor (Q1) is connected to one end of a first resistor (R1) and a control terminal (SEL) of the first switch (U1), the other end of the first resistor is connected to the DC power supply, an emitter of the first transistor (Q1) is grounded, a base of the first transistor (Q1) is connected to one end of a first diode (D1) and a second diode (D2) through a second resistor (R2), the other end of the first diode (D1) is connected to the third PIN3, and the other end of the second diode (D2) is connected to the fourth PIN 4.
5. The audio interface adaptation circuit according to claim 3, wherein the second detection and control module comprises a second transistor (Q2) and a third transistor (Q3), the second transistor (Q2) is a PNP transistor, the third transistor (Q3) is an NPN transistor, an emitter of the second transistor (Q2) is connected to the third PIN PIN3 through a third resistor (R3), a base of the second transistor (Q2) is connected to the fourth PIN PIN4 through a fifth resistor (R5), a collector of the second transistor (Q2) is connected to a base of the third transistor (Q3) through a sixth resistor (R6), an emitter of the third transistor (Q3) is connected to the fourth PIN4, a collector of the third transistor (Q3) is connected to one end of a fourth resistor (R4) and a control terminal (U2), and another end of the fourth resistor (R4) is connected to the direct current power supply.
6. The audio interface adaptation of claim 3, characterized in that the first detection and control module comprises a first MOS transistor (Q1 ') which is an N-channel MOS transistor, a drain of the first MOS transistor (Q1 ') is connected to the control terminal (SEL) of the first switch (U1) and the DC power supply, a source of the first MOS transistor is grounded, a gate of the first MOS transistor (Q1 ') is connected to one end of a first diode (D1) and one end of a second diode (D2), the other end of the first diode (D1) is connected to the third PIN3, and the other end of the second diode (D2) is connected to the fourth PIN 4.
7. The audio interface adaptation circuit according to claim 3, wherein the second detection and control module comprises a second MOS transistor (Q2 ') and a third MOS transistor (Q3'), the second MOS transistor (Q2 ') is a P-channel MOS transistor, the third MOS transistor (Q3') is an N-channel MOS transistor, a drain of the second MOS transistor (Q2 ') is connected to the third PIN PIN3, a gate of the second MOS transistor (Q2') is connected to the fourth PIN, a source of the second MOS transistor (Q2 ') is connected to the gate of the third MOS transistor (Q3'), a source of the third MOS transistor (Q3 ') is connected to the fourth PIN PIN4, and a drain of the third MOS transistor (Q2') is connected to the control terminal (SEL) of the second switch (U2) and the DC power supply.
8. The audio interface adaptation circuit of claim 1, wherein the audio interface is a jack or a plug.
9. A data line, characterized in that the data line comprises an adaptation circuit as claimed in any one of claims 1-8.
10. An audio device, characterized in that the audio device comprises an adaptation circuit as claimed in any one of claims 1-8.
CN202010038238.9A 2020-01-14 2020-01-14 Audio interface adaptation circuit, data line and audio equipment Active CN111182417B (en)

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