CN112887868A - Audio circuit, electronic equipment, wireless earphone system and audio system - Google Patents
Audio circuit, electronic equipment, wireless earphone system and audio system Download PDFInfo
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- CN112887868A CN112887868A CN202110123364.9A CN202110123364A CN112887868A CN 112887868 A CN112887868 A CN 112887868A CN 202110123364 A CN202110123364 A CN 202110123364A CN 112887868 A CN112887868 A CN 112887868A
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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
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
- H04R1/1025—Accumulators or arrangements for charging
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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
- 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
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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
- H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
- H04R2201/10—Details of earpieces, attachments therefor, earphones or monophonic headphones covered by H04R1/10 but not provided for in any of its subgroups
- H04R2201/103—Combination of monophonic or stereophonic headphones with audio players, e.g. integrated in the headphone
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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
- 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
Abstract
The application discloses audio circuit, electronic equipment, wireless earphone system and audio system belongs to the electronic circuit field. The audio circuit includes: the audio circuit comprises an audio interface, one or two channel paths, and any channel path comprises: the first output end of the audio signal providing unit is connected with the input end of the digital power amplifier; the output end of the digital power amplifier is connected with the first stationary contact of the switch; the movable contact of the switch is connected with the audio signal output pin of the corresponding sound channel passage in the audio interface, and the control end of the switch is connected with the output end of the processing unit; the wireless earphone connecting piece detection unit is connected with the microphone pin of the audio interface at the input end and connected with the input end of the processing unit at the output end; and a processing unit. The circuit can solve the problem that the wireless earphone cannot be continuously used while being charged.
Description
Technical Field
The application belongs to the field of electronic circuits, and particularly relates to an audio circuit, electronic equipment, a wireless earphone system and an audio system.
Background
The wireless earphone is more and more widely used due to the advantages of no restriction of wires, convenience in wearing and the like. As a portable mobile device, the battery becomes an important component of the wireless headset, and the cruising ability of the battery directly affects the user experience.
Currently, the endurance of a wireless headset is related to the capacity of the battery. For example, the earbud type wireless headset has a small battery capacity due to its narrow internal space, and the endurance time varies from 2 hours to 5 hours. Due to the limitation of the endurance time of the wireless headset, the battery of the wireless headset needs to be charged timely when the electric quantity of the wireless headset is insufficient.
At present, wireless earphones mainly have two charging modes, one is to use an adapter to charge the earphones; the other is to charge the earphone by using a charging bin, but when the charging is carried out by using the two methods, the wireless earphone cannot be used continuously while charging.
Disclosure of Invention
The embodiment of the application aims to provide an audio circuit, a wireless earphone connecting piece, a wireless earphone assembly, equipment and a system, and the problem that a wireless earphone cannot be continuously used while being charged can be solved.
In order to solve the technical problem, the present application is implemented as follows:
in a first aspect, an embodiment of the present application provides an audio circuit, where the audio circuit includes an audio interface, and one or two channel paths, where any of the channel paths includes:
the first output end of the audio signal providing unit is connected with the input end of the digital power amplifier;
the output end of the digital power amplifier is connected with the first stationary contact of the switch;
the movable contact of the switch is connected with the audio signal output pin of the corresponding sound channel passage in the audio interface, and the control end of the switch is connected with the output end of the processing unit;
the input end of the wireless earphone connecting piece detection unit is connected with the microphone pin of the audio interface, and the output end of the wireless earphone connecting piece detection unit is connected with the input end of the processing unit;
and the processing unit controls the first fixed contact to be conducted with the movable contact under the condition that the wireless earphone connecting piece detecting unit detects that the wireless earphone connecting piece is inserted into the audio interface.
In a second aspect, an embodiment of the present application provides an electronic device including the audio circuit according to the first aspect.
In a third aspect, an embodiment of the present application provides a wireless headset system, which includes a wireless headset connector and a wireless headset assembly, where the wireless headset connector includes:
a plug comprising a microphone pin, a ground pin, one or two channel pins;
a channel path corresponding to any channel pin, the channel path comprising:
the sound channel output end is connected with the corresponding sound channel pin, and the grounding end is connected with the grounding pin;
the sound channel output end and the grounding end are arranged on the shell of the wireless earphone connecting piece;
and, the wireless headset assembly includes one or two wireless headsets, either of which includes:
the sound channel input end and the grounding end are arranged on the wireless earphone shell;
the input end of the rectifying unit is connected with the sound channel input end, and the output end of the rectifying unit is respectively connected with the input end of the charging circuit and the input end of the wireless playing unit;
the output end of the charging unit is connected with the anode of the battery;
the positive pole of the battery is connected with the power supply end of the wireless playing unit, and the negative pole of the battery is connected with the grounding end;
the wireless playing unit;
the input end of the filtering unit is connected with the sound channel input end, and the output end of the filtering unit is connected with a loudspeaker;
the loudspeaker.
In a fourth aspect, embodiments of the present application provide an audio system comprising an electronic device as described in the second aspect, and a wireless headset system as described in the third aspect.
In an embodiment of the present application, there is provided an audio circuit, the audio circuit including an audio interface, one or two channel paths, any channel path including: the first output end of the audio signal providing unit is connected with the input end of the digital power amplifier; the output end of the digital power amplifier is connected with the first stationary contact of the switch; the movable contact of the switch is connected with the audio signal output pin of the corresponding sound channel passage in the audio interface, and the control end of the switch is connected with the output end of the processing unit; the wireless earphone connecting piece detection unit is connected with the microphone pin of the audio interface at the input end and connected with the input end of the processing unit at the output end; and the processing unit controls the first fixed contact to be conducted with the movable contact under the condition that the wireless earphone connecting piece detecting unit detects that the wireless earphone connecting piece is inserted into the audio interface. In the embodiment of the application, the digital power amplifier loads the audio signal with low frequency into the high-frequency signal, and the high-frequency signal has the capability of charging the wireless headset due to the strong loading capability of the high-frequency signal. While the high frequency signal is modulated by the audio signal and therefore carries the audio signal. That is, the audio circuit provided by the embodiment of the present application provides a basis for the wireless headset to continue to be used while being charged.
Drawings
Fig. 1 is a schematic structural diagram of an audio circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram illustrating a connection relationship between a wireless headset connector detection unit and a wireless headset connector according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a digital power amplifier provided in an embodiment of the present application;
fig. 4 is a schematic structural diagram of an analog power amplifier provided in an embodiment of the present application;
fig. 5 is a schematic cross-sectional view of a non-plug side of a wireless headset connector according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of a wireless headset according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of another wireless headset according to an embodiment of the present application;
fig. 8 is a schematic cross-sectional view of a rear portion (non-speaker side) of a wireless headset according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the application may be practiced in sequences other than those illustrated or described herein, and that the terms "first," "second," and the like are generally used herein in a generic sense and do not limit the number of terms, e.g., the first term can be one or more than one. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.
The audio circuit, the wireless headset connector, the wireless headset assembly, the device and the system provided by the embodiment of the present application are described in detail below with reference to the accompanying drawings through specific embodiments and application scenarios thereof.
The first embodiment is as follows:
embodiments of the present application provide an audio circuit that includes an audio interface, one or two channel paths. The audio interface is used for being inserted into the wireless earphone connecting piece and comprises one or two audio signal output pins, a grounding pin and a microphone pin. And, in the case where the wireless headset assembly includes a wireless headset, the audio circuit provided by the embodiments of the present application includes a channel path, and the audio interface includes an audio signal output pin. Correspondingly, under the condition that the wireless earphone component comprises two wireless earphones, the audio circuit provided by the embodiment of the application comprises two sound channel passages which are respectively a left sound channel passage and a right sound channel passage, and the audio interface comprises two audio signal output pins which are respectively a left sound channel audio signal output pin and a right sound channel audio signal pin.
As shown in fig. 1, any channel path includes:
an audio signal providing unit 101, wherein a first output end of the audio signal providing unit 101 is connected with an input end of the digital power amplifier 102;
the output end of the digital power amplifier 102 is connected with a first stationary contact of the switch 103;
a movable contact of the switch 103 is connected with an audio signal output pin of a corresponding sound channel passage in the audio interface, and a control end of the switch 103 is connected with an output end of the processing unit 105;
the wireless earphone connecting piece detection unit 104 is characterized in that the input end of the wireless earphone connecting piece detection unit 104 is connected with a microphone pin of the audio interface, and the output end of the wireless earphone connecting piece detection unit 104 is connected with the input end of the processing unit 105;
the processing unit 105, the processing unit 105 controls the first fixed contact and the movable contact to be conducted under the condition that the wireless earphone connecting piece detecting unit 104 detects that the wireless earphone connecting piece is inserted into the audio interface;
correspondingly, the processing unit 105 controls the first stationary contact to be disconnected from the movable contact in case the wireless headset connector detection unit 104 does not detect that the wireless headset connector is inserted into the audio interface.
In the embodiment of the present application, the digital power amplifier 102 is used for loading the audio signal of low frequency provided by the audio signal providing unit 101 into a signal of high frequency. In one example, the low-frequency audio signal provided by the audio signal providing unit 101 is a sine wave signal, and the high-frequency signal applied thereto is a square wave signal.
And the wireless headset connector detecting unit 104 is configured to detect whether the wireless headset connector is inserted into the audio interface.
According to an embodiment of the present application, the audio interface may be an audio interface newly added to an electronic device provided with the audio circuit provided in the embodiment of the present application. On this basis, the wireless connector detecting unit 104 may be composed of a spring piece disposed in the audio interface and a pressure detecting unit. And under the condition that the pressure detection unit detects that the elastic sheet has pressure, determining that the wireless earphone connecting piece is inserted into the audio interface, otherwise, determining that the wireless earphone connecting piece is not inserted into the audio interface.
According to an embodiment of the present application, the audio interface may also be an original audio interface on an electronic device provided with the audio circuit provided in the embodiment of the present application. On this basis, as shown in fig. 2, the wireless connection detecting unit 104 includes:
the output end of the constant current source 1041 is connected with a microphone pin of the audio interface;
the input end of the voltage sensor 1042 is connected to the output end of the constant current source 1041, and the output end of the voltage sensor 1042 is connected to the processing unit 105.
In the embodiment of the present application, the constant current source 1041 provides a constant current source signal (for example, a constant current of 100 uA) to the microphone pin in the audio interface, and in the case that the wireless headset connector is inserted into the audio interface, the constant current source, the microphone pin in the audio interface, the microphone pin in the wireless headset connector, the resistance between the microphone pin in the wireless headset connector and the ground pin in the wireless headset connector, and the circuit between the ground pins in the wireless headset connector are turned on. At this time, the voltage sensor 1042 can read the voltage across the resistor and report the voltage to the processing unit 105. The processing unit 105 determines the set voltage range over which the voltage is present, at which point it is determined that the wireless headset connector is plugged into the audio interface.
If other plugs are plugged into the audio interface or no plug is plugged into the audio interface, the processing unit 105 determines that the voltage is not within the set voltage range, and then determines that the wireless headset connector is not plugged into the audio interface.
And the processing unit 105 controls the first stationary contact and the movable contact to be conducted in case that the wireless headset connector detecting unit 104 detects that the wireless headset connector is inserted into the audio interface. At this time, the audio signal output by the audio signal providing unit 101 is loaded as a high frequency signal and is output at a corresponding audio signal pin of the audio interface.
In an embodiment of the present application, there is provided an audio circuit, the audio circuit including an audio interface, one or two channel paths, any channel path including: the first output end of the audio signal providing unit is connected with the input end of the digital power amplifier; the output end of the digital power amplifier is connected with the first stationary contact of the switch; the movable contact of the switch is connected with the audio signal output pin of the corresponding sound channel passage in the audio interface, and the control end of the switch is connected with the output end of the processing unit; the wireless earphone connecting piece detection unit is connected with the microphone pin of the audio interface at the input end and connected with the input end of the processing unit at the output end; and the processing unit controls the first fixed contact to be conducted with the movable contact under the condition that the wireless earphone connecting piece detecting unit detects that the wireless earphone connecting piece is inserted into the audio interface. In the embodiment of the application, the digital power amplifier loads the audio signal with low frequency into the high-frequency signal, and the high-frequency signal has the capability of charging the wireless headset due to the strong loading capability of the high-frequency signal. While the high frequency signal is modulated by the audio signal and therefore carries the audio signal. That is, the audio circuit provided by the embodiment of the present application provides a basis for the wireless headset to continue to be used while being charged.
On the basis of any of the above embodiments, as shown in fig. 1, the audio circuit provided in the embodiment of the present application further includes an analog power amplifier 106, where:
an analog power amplifier 106, an input terminal of the analog power amplifier 106 being connected to a second output terminal of the audio signal providing unit 101;
the switch 103 further comprises a second stationary contact, which is connected to the output of the analog power amplifier 106;
and the processing unit 105, wherein the processing unit 105 controls the second fixed contact to be conducted with the movable contact when the wireless earphone connector detecting unit 104 detects that the wireless earphone connector is not inserted into the audio interface.
In the embodiment of the present application, the processing unit 105 controls the second stationary contact to be conducted with the movable contact in case that the wireless headset connector detecting unit 104 detects that the wireless headset connector is not inserted into the audio interface. Therefore, the audio circuit can be in a circuit state corresponding to the wired earphone. Thus, when the wired earphone is inserted into the audio interface, the wired earphone can be matched with the wired earphone to realize the playing of the audio signal.
On the basis of any of the above embodiments, as shown in fig. 3, the digital power amplifier 102 provided in the embodiments of the present application includes:
the output end of the triangular wave generator 1021 is connected with the non-inverting input end of the comparator 1022;
a comparator 1022, an inverting input terminal of the comparator 1022 being connected to a first output terminal of the audio signal supply unit 11, an output terminal of the comparator 1022 being connected to an input terminal of the driver 1023;
the output end of the driver 1023 is respectively connected with the grid electrode of the NMOS tube 1024 and the grid electrode of the PMOS tube 1025;
a source electrode of the PMOS tube 1025 is connected with an output end of a forward voltage source 1026, a drain electrode of the PMOS tube 1025 is connected with a source electrode of the NMOS tube 1024, and a drain electrode of the PMOS tube 1025 is connected with a first static contact of the switch 103;
a forward voltage source 1026;
the drain electrode of the NMOS tube 1024 is connected with the output end of the negative voltage source 1027;
a negative voltage source 1027;
a first voltage stabilizing diode 1028, wherein the cathode of the first voltage stabilizing diode 1028 is connected with the source electrode of the PMOS tube 1025, and the anode of the first voltage stabilizing diode 1028 is connected with the drain electrode of the PMOS tube 1025;
and a second zener diode 1029, wherein a cathode of the second zener diode 1029 is connected to the source of the NMOS transistor 1024, and an anode of the second zener diode 1029 is connected to the drain of the NMOS transistor 1024.
It should be noted that the digital power amplifier may also adopt other structures, for example, a structure of a class K power amplifier, and the embodiment of the present application is not limited thereto.
On the basis of any of the above embodiments, as shown in fig. 4, the analog power amplifier 106 provided in the embodiments of the present application includes:
a first resistor 1061, wherein a first end of the first resistor 1061 is grounded, and a second end of the first resistor 1061 is connected to a first end of a second resistor 1062;
a second resistor 1062, a second end of the second resistor 1062 is connected to the second stationary contact of the switch 103;
a non-inverting input terminal of the power amplifier 1063 is connected to the second output terminal of the audio signal providing unit 101, an inverting input terminal of the power amplifier 1063 is connected to the second terminal of the first resistor 1061, and an output terminal of the power amplifier 1063 is connected to the second terminal of the second resistor 1062.
It should be noted that the analog power amplifier 106 may also adopt other structures, for example, a structure of a class a power amplifier, and the embodiment of the present application is not limited thereto.
Example two:
an embodiment of the present application provides an electronic device, which includes the audio circuit according to any one of the above embodiments.
For example, the electronic device provided by the embodiment of the present application may be a mobile phone, a tablet computer, a wearable device, and the like.
Example three:
an embodiment of the present application provides a wireless headset connector, as shown in fig. 2, the wireless headset connector includes a plug 201, and the plug 201 includes a microphone pin 2011, a ground pin 2012, and one or two sound channel pins. As shown in fig. 2, the plug 201 in fig. 2 includes a left channel pin 2013 and a right channel pin 2014.
The wireless headset connection further includes a sound channel path corresponding to any sound channel pin, as shown in fig. 2, the sound channel path includes:
a sound channel output terminal 2021 connected to the corresponding sound channel pin, and a ground terminal 2022 connected to the ground pin 2012.
The sound channel output end 2021 and the grounding end 2022 are disposed on the housing of the wireless headset connector. Thus, the wireless earphone component can be ensured to be electrically connected with the wireless earphone connecting piece.
It should be noted that the wireless earphone and the wireless earphone connecting element can be electrically connected in a plugging manner.
In one embodiment, as shown in fig. 2, a magnet 203 is disposed on a side of the wireless headset connector near the output end of the sound channel.
In the embodiment of the present application, a better electrical connection between the wireless earphone connector and the wireless earphone near the sound channel output end can be achieved through the magnet 203.
In one embodiment, as shown in fig. 5, the channel output end 2021 and the ground end 2022 in the channel path are concentrically arranged, and the ground end 2022 is located at the outer ring. In this way, the channel output end 2021 can be protected, so that the audio signal transmitted by the channel output end 2021 can be prevented from being interfered. It should be noted that fig. 5 is a cross-sectional view of a non-plug side of a wireless headset connector provided in an embodiment of the present application, where an outermost ring is a housing of the wireless headset connector.
In one embodiment, as shown in fig. 2, plug 201 also includes a resistor 2015, which is connected between microphone pin 2011 and ground pin 2013.
In the embodiment of the present application, the resistor 2015 is an ID resistor, and the voltage across the ID resistor can identify the plug 201 of the wireless headset connector. That is, the resistor 2015 provided by the embodiment of the present application provides a detection basis for the wireless headset connector detecting unit 104 in the audio circuit.
Example four:
the embodiment of the application provides a wireless earphone assembly, which comprises one wireless earphone or two wireless earphones.
In one example, the wireless headset may be a bluetooth wireless headset.
Any wireless headset, as shown in fig. 6, includes:
a sound channel input terminal 301 and a ground terminal 302 provided on the wireless headset housing;
the input end of the rectifying unit 303 is connected with the sound channel input end 301, and the output end of the rectifying unit 303 is respectively connected with the input end of the charging circuit 304 and the input end of the wireless playing unit 305;
a charging unit 304, an output end of the charging unit 304 is connected with a positive electrode of the battery 306;
a battery 306, wherein the positive pole of the battery 306 is connected with the power supply terminal of the wireless playing unit 305, and the negative pole of the battery 306 is connected with the ground terminal 302;
a wireless playback unit 305;
a filtering unit 307, wherein the input end of the filtering unit 307 is connected with the sound channel input end 301, and the output end of the filtering unit 307 is connected with the loudspeaker 308;
a speaker 308.
In this embodiment of the present application, after the wireless headset provided in this embodiment of the present application is electrically connected to the wireless headset connector provided in this embodiment of the present application, and a plug of the wireless headset connector is inserted into the audio circuit provided in this embodiment of the present application, the rectifying unit 303 receives a high-frequency signal acquired from the audio circuit by the wireless headset connector from the channel input end 301, and rectifies the high-frequency signal to obtain a charging current. Further, the rectifying unit 303 inputs the obtained charging current to the charging unit 304, and the charging unit 304 charges the battery 306.
Meanwhile, the wireless playing module 305 controls itself to be in a sleep state or sets the output to be high impedance, that is, controls the wireless playing module 305 not to work, when the output end of the rectifying unit 303 detects the charging current. Therefore, the energy consumption waste of the wireless playing module 305 can be avoided, and meanwhile, the problem that the audio signal output by the wireless playing module 305 and the audio signal output by the filtering unit 307 control the operation of the loudspeaker 308 together to cause disorder of the loudspeaker 308 can be avoided.
And the filtering unit 307 receives the high frequency signal acquired from the audio circuit by the wireless headphone connector from the channel input end 301, demodulates the high frequency signal, obtains the audio signal of low frequency, and sends the audio signal of low frequency to the speaker 308, so that the speaker 308 can sound the audio signal of low frequency. In this way, the wireless earphone can be used continuously while being charged.
On the basis of any of the above embodiments, as shown in fig. 6, the rectifying unit 303 includes: a diode 3031 and a first capacitor 3032;
the anode of the diode 3031 is connected with the sound channel input end 301, and the cathode of the diode 3031 is connected with the input end of the charging unit 304;
a first terminal of the first capacitor 3032 is connected to the cathode of the diode 3031, and a second terminal of the first capacitor 3032 is connected to ground.
On the basis of any of the above embodiments, as shown in fig. 6, the filtering unit 307 includes: an inductor 3071 and a second capacitor 3072;
a first end of the inductor 3071 is connected with the sound channel input end 301, and a second end of the inductor 3071 is connected with the loudspeaker 308;
the first terminal of the second capacitor 3072 is connected to the second terminal of the inductor 3071, and the second terminal of the second capacitor 3072 is grounded.
In addition to any of the above embodiments, as shown in fig. 7, a magnet 309 is provided near the vocal tract input end 301 of the wireless headset.
In the embodiment of the present application, the magnet 309 is used in cooperation with the magnet 203 in the wireless headset connector, so that the wireless headset connector can be electrically connected to the wireless headset near the sound channel output end.
In any of the above embodiments, as shown in fig. 8, the channel input terminal 301 and the ground terminal 302 of the wireless headset are concentric, and the ground terminal 302 is located at the outer ring. In this way, the channel output terminal 301 can be protected from interfering with the audio signal transmitted by the channel input terminal 302. And the inner space of the sound channel input end 301 of the annular wireless earphone can be used as a microphone through hole of the wireless earphone. It should be noted that fig. 8 is a schematic cross-sectional view of a rear portion (non-speaker side) of a wireless headset according to an embodiment of the present application, where an outermost ring is a housing of the wireless headset.
The sound channel input end 301 of the wireless earphone is matched with the sound channel output end 2021 in the wireless earphone connector, and the grounding end 302 of the wireless earphone is matched with the grounding end 2022 in the wireless earphone connector.
Example five:
the embodiment of the application provides a wireless earphone system, which comprises the wireless earphone connecting piece in any one of the three embodiments and the wireless earphone assembly in any one of the four embodiments.
Example six:
an embodiment of the present application provides an audio system, which includes the electronic device according to the second embodiment and the wireless headset system according to the fifth embodiment.
While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (13)
1. An audio circuit comprising an audio interface, one or two channel paths, any of the channel paths comprising:
the first output end of the audio signal providing unit is connected with the input end of the digital power amplifier;
the output end of the digital power amplifier is connected with the first stationary contact of the switch;
the movable contact of the switch is connected with the audio signal output pin of the corresponding sound channel passage in the audio interface, and the control end of the switch is connected with the output end of the processing unit;
the input end of the wireless earphone connecting piece detection unit is connected with the microphone pin of the audio interface, and the output end of the wireless earphone connecting piece detection unit is connected with the input end of the processing unit;
and the processing unit controls the first fixed contact to be conducted with the movable contact under the condition that the wireless earphone connecting piece detecting unit detects that the wireless earphone connecting piece is inserted into the audio interface.
2. The audio circuit of claim 1, further comprising an analog power amplifier, wherein:
the input end of the analog power amplifier is connected with the second output end of the audio signal providing unit;
the switch also comprises a second stationary contact which is connected with the output end of the analog power amplifier;
and the processing unit controls the second fixed contact to be conducted with the movable contact under the condition that the wireless earphone connecting piece detecting unit detects that the wireless earphone connecting piece is not inserted into the audio interface.
3. The audio circuit of claim 1, wherein the digital power amplifier comprises:
the output end of the triangular wave generator is connected with the non-inverting input end of the comparator;
the inverting input end of the comparator is connected with the first output end of the audio signal providing unit, and the output end of the comparator is connected with the input end of the driver;
the output end of the driver is respectively connected with the grid electrode of the NMOS tube and the grid electrode of the PMOS tube;
the source electrode of the PMOS tube is connected with the output end of the forward voltage source, the drain electrode of the PMOS tube is connected with the source electrode of the NMOS tube, and the drain electrode of the PMOS tube is connected with the first stationary contact of the switch;
the forward voltage source;
the drain electrode of the NMOS tube is connected with the output end of the negative voltage source;
the negative voltage source;
the cathode of the first voltage stabilizing diode is connected with the source electrode of the PMOS tube, and the anode of the first voltage stabilizing diode is connected with the drain electrode of the PMOS tube;
and the cathode of the second voltage stabilizing diode is connected with the source electrode of the NMOS tube, and the anode of the second voltage stabilizing diode is connected with the drain electrode of the NMOS tube.
4. The audio circuit of claim 2, wherein the analog power amplifier comprises:
the first end of the first resistor is grounded, and the second end of the first resistor is connected with the first end of the second resistor;
a second end of the second resistor is connected with a second stationary contact of the switch;
the positive phase input end of the power amplifier is connected with the second output end of the audio signal providing unit, the negative phase input end of the power amplifier is connected with the second end of the first resistor, and the output end of the power amplifier is connected with the second end of the second resistor.
5. The audio circuit of claim 1, wherein the wireless headset connector detection unit comprises:
the output end of the constant current source is connected with a microphone pin of the audio interface;
and the input end of the voltage sensor is connected with the output end of the constant current source, and the output end of the voltage sensor is connected with the processing unit.
6. An electronic device, characterized in that the electronic device comprises an audio circuit according to any of claims 1-5.
7. A wireless headset system comprising a wireless headset connector and a wireless headset assembly, wherein the wireless headset connector comprises:
a plug comprising a microphone pin, a ground pin, one or two channel pins;
a channel path corresponding to any channel pin, the channel path comprising:
the sound channel output end is connected with the corresponding sound channel pin, and the grounding end is connected with the grounding pin;
the sound channel output end and the grounding end are arranged on the shell of the wireless earphone connecting piece;
and, the wireless headset assembly includes one or two wireless headsets, either of which includes:
the sound channel input end and the grounding end are arranged on the wireless earphone shell;
the input end of the rectifying unit is connected with the sound channel input end, and the output end of the rectifying unit is respectively connected with the input end of the charging circuit and the input end of the wireless playing unit;
the output end of the charging unit is connected with the anode of the battery;
the positive pole of the battery is connected with the power supply end of the wireless playing unit, and the negative pole of the battery is connected with the grounding end;
the wireless playing unit;
the input end of the filtering unit is connected with the sound channel input end, and the output end of the filtering unit is connected with a loudspeaker;
the loudspeaker.
8. The system of claim 7, wherein for the wireless earphone connector, a magnet is disposed on a side of the wireless earphone connector close to the output end of the sound channel;
and for the wireless earphone, a magnet is arranged on one side close to the sound channel input end of the wireless earphone.
9. The system of claim 7, wherein for the wireless headset connector, the acoustic channel output end of the acoustic channel path is concentrically arranged with the ground end, and the ground end is in an outer ring;
and for the wireless earphone, the sound channel input end of the wireless earphone and the grounding end are in a concentric ring shape, and the grounding end is positioned in the outer ring.
10. The system of claim 7, wherein the plug further comprises a resistor connected between the microphone pin and the ground pin.
11. The system of claim 7, wherein the rectification unit comprises: a diode and a first capacitor;
the anode of the diode is connected with the sound channel input end, and the cathode of the diode is connected with the input end of the charging unit;
the first end of the first capacitor is connected with the cathode of the diode, and the second end of the first capacitor is grounded.
12. The system of claim 7, wherein the filtering unit comprises: an inductor and a second capacitor;
the first end of the inductor is connected with the sound channel input end, and the second end of the inductor is connected with the loudspeaker;
the first end of the second capacitor is connected with the second end of the inductor, and the second end of the second capacitor is grounded.
13. An audio system, characterized in that the audio system comprises an electronic device according to claim 6, and a wireless headset system according to any of claims 7-12.
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| CN112887868B (en) | 2023-07-21 |
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