CN212115639U - Audio output channel control circuit and wireless earphone - Google Patents
Audio output channel control circuit and wireless earphone Download PDFInfo
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- CN212115639U CN212115639U CN202021117943.XU CN202021117943U CN212115639U CN 212115639 U CN212115639 U CN 212115639U CN 202021117943 U CN202021117943 U CN 202021117943U CN 212115639 U CN212115639 U CN 212115639U
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Abstract
The utility model discloses an audio output channel control circuit and wireless earphone, this audio output channel control circuit includes: an audio amplification circuit; an audio output control circuit configured to output an audio signal and output a first control signal or a second control signal according to a received output selection signal; the input end of the audio channel switching circuit is connected with the audio signal output end of the audio output control circuit, and the controlled end of the audio channel switching circuit is connected with the control end of the audio output control circuit; an audio channel switching circuit configured to output an audio signal to a speaker upon receiving a first control signal; and when the second control signal is received, the audio signal is output to the audio amplifying circuit so as to be output to the loudspeaker after the audio signal is subjected to audio amplification processing. The utility model discloses can realize switching and multiplexing of earphone conventional function and audio amplifier function, satisfy the user's application demand under different scenes.
Description
Technical Field
The utility model relates to a wireless earphone technical field, in particular to audio output channel control circuit and wireless earphone.
Background
Bluetooth headsets are increasingly popular with consumers due to their wireless connectivity characteristics. In the face of different application scenes, the Bluetooth headset needs to meet the diversified demands of people through extended functions on the original basis. For example, when dealing with personal matters during work, in order to avoid disturbing other people to wear the bluetooth headset, the user only receives information, but when sharing information with more people, the user needs to play the information with large volume so as to ensure that each person can clearly hear the information, and the function of the conventional bluetooth headset cannot meet the requirement.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an audio output channel control circuit and wireless earphone aims at realizing the audio amplifier of wireless earphone and the multiplexing of earphone function.
In order to achieve the above object, the utility model provides an audio output channel control circuit is applied to in the wireless earphone, audio output channel control circuit includes:
an audio amplification circuit;
an audio output control circuit configured to output an audio signal and output a first control signal or a second control signal according to a received output selection signal;
the input end of the audio channel switching circuit is connected with the audio signal output end of the audio output control circuit, and the controlled end of the audio channel switching circuit is connected with the control end of the audio output control circuit; the audio channel switching circuit configured to output the audio signal to a speaker upon receiving the first control signal; and when the second control signal is received, the audio signal is output to the audio amplifying circuit so as to be output to the loudspeaker after audio amplification processing is carried out on the audio signal.
Optionally, the audio output channel control circuit further comprises:
the output end of the key signal output circuit is connected with the input end of the audio output control circuit; the key signal output circuit is configured to output a corresponding key signal when a key is triggered, so that the audio output control circuit outputs the first control signal or the second control signal according to an output selection signal corresponding to the key signal.
Optionally, the key signal output circuit includes a key switch, a current-limiting resistor and a first electrostatic protection diode, one end of the key switch is grounded, and the other end of the key switch is connected to the audio output control circuit through the current-limiting resistor; one end of the first electrostatic protection diode is connected with the common end of the key switch and the current-limiting resistor, and the other end of the first electrostatic protection diode is grounded.
Optionally, the audio output control circuit includes a wireless chip, and an output end of the wireless chip is an audio signal output end of the audio output control circuit; the wireless chip is configured to receive an output selection signal corresponding to the key signal and output a first control signal or a second control signal;
and/or the wireless chip is configured to receive an output selection signal corresponding to the wireless communication signal and output the first control signal or the second control signal.
Optionally, the audio channel switching circuit includes a switch chip, an input end of the switch chip is an input end of the audio channel switching circuit, an enable end of the switch chip is a controlled end of the audio channel switching circuit, and two output ends of the switch chip are connected to the input end of the audio amplifying circuit and the speakers in a one-to-one correspondence manner.
Optionally, the audio output channel control circuit further includes an audio processing circuit, an input end of the audio processing circuit is connected to an output end of the audio output control circuit, and an output end of the audio processing circuit is connected to the audio channel switching circuit.
Optionally, the audio output channel control circuit further includes an audio interference suppression circuit, and the audio interference suppression circuit is serially disposed between the audio amplification circuit and the speaker.
Optionally, the audio interference suppression circuit includes a filter capacitor, an audio interference suppression unit, and a second electrostatic protection diode; one end of the audio interference suppression unit is connected with the output end of the audio amplification circuit, and the other end of the audio interference suppression unit is connected with the loudspeaker; one end of the first electrostatic protection diode is connected with the common end of the audio interference suppression unit and the loudspeaker, and the other end of the first electrostatic protection diode is connected; one end of the filter capacitor is connected with the audio interference suppression unit and the common end of the loudspeaker, and the other end of the filter capacitor is grounded.
The utility model also provides a wireless earphone, which comprises a loudspeaker and the audio output channel control circuit;
and the output end of the audio output channel control circuit is connected with the loudspeaker.
Optionally, the wireless headset is a wireless headset.
The utility model discloses a set up audio output control circuit and receive the output select signal that the user triggered, and according to the output select signal received, export first control signal or second control signal to audio channel switching circuit, audio channel switching circuit is when receiving first control signal, directly exports the audio signal of audio output control circuit output to the speaker; and when the second control signal is received, the audio signal output by the audio output control circuit is output to the audio amplifying circuit so as to output the audio signal to the loudspeaker after audio amplification processing. The utility model discloses can be according to user's demand, when the user wants to use the audio amplifier function, carry out the secondary with audio signal and enlarge the back and play out through the speaker to realize the audio information sharing. When the user wants to use the conventional function of the earphone, the audio signal is directly fed into the ear of the wearer through the loudspeaker so as to avoid disturbing others. The utility model discloses can realize switching and multiplexing of earphone conventional function and audio amplifier function, satisfy the user's application demand under different scenes.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a functional schematic diagram of an embodiment of an audio output channel control circuit according to the present invention;
fig. 2 is a schematic diagram of a circuit structure of an embodiment of the audio output channel control circuit of the present invention.
The reference numbers illustrate:
the objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The utility model provides an audio output channel control circuit is applied to wireless earphone, especially wear-type wireless earphone. With the rapid development of earphone technology, especially the wider and wider application of bluetooth earphones, the latest TWS (true wireless stereo) earphone is a typical product with a good combination of intelligentization and wireless trend in the main earphone, and the TWS earphone has a certain share in the earphone market by virtue of the wearing freedom and good tone quality. The TWS headset is generally composed of a master headset and a slave headset, and a single headset can be used independently, that is, the two headsets can be used as both the master headset and the slave headset. The TWS earphone transmits the audio signal of the mobile phone to the master earphone through a Bluetooth link through a Bluetooth technology, and the master earphone transmits the audio data to the slave master earphone, so that the purpose of simultaneously playing two ears is achieved. Bluetooth headsets are increasingly popular with consumers due to their wireless connectivity characteristics. Especially, the application of the bluetooth headset is more and more extensive, and the wireless headset is also used more and more frequently in various occasions, and the single use time is also longer and longer. In addition, in the actual use process, people often establish a communication link between the wireless headset and the smart mobile terminal, such as a mobile phone, a smart watch, and the like, play voice, such as conversation or music, by using the wireless headset, the wireless headset can also collect voice of a user, and the voice is output to the smart mobile terminal through the wireless communication module configured in the wireless headset. In the face of different application scenes, the Bluetooth headset needs to meet the diversified demands of people through extended functions on the original basis. For example, when dealing with personal matters during work, in order to avoid disturbing other people to wear the bluetooth headset, the user only receives information, but when sharing information with more people, the user needs to play the information with large volume so as to ensure that each person can clearly hear the information, and the function of the conventional bluetooth headset cannot meet the requirement.
Referring to fig. 1 and 2, in an embodiment of the present invention, the audio output channel control circuit includes: an audio output control circuit 10, an audio channel switching circuit 20, and an audio amplifying circuit 30. Wherein the audio output control circuit 10 is configured to output an audio signal and output a first control signal or a second control signal according to the received output selection signal;
an input end of the audio channel switching circuit 20 is connected to an audio signal output end of the audio output control circuit 10, and a controlled end of the audio channel switching circuit is connected to a control end of the audio output control circuit 10; the audio channel switching circuit 20 configured to output the audio signal to a speaker SPK1 upon receiving the first control signal; when receiving the second control signal, the audio signal is output to the audio amplifying circuit 30, so that the audio signal is subjected to audio amplification processing and then output to the speaker SPK 1.
The audio output channel control circuit of the embodiment is applied to a wireless earphone, such as a headphone, which is generally provided with two earpieces, a speaker SPK1 component is provided in the two earpieces, and when the speaker SPK1 component works, the wireless earphone supplies power to the speaker SPK1 component, so that an audio signal of the wireless earphone is output to the speaker SPK1 component for playing after being subjected to audio processing.
In the wireless headset, a light sensor, a motion sensor, and other sensors may be provided. Specifically, the light sensor includes an ambient light sensor and a proximity sensor, wherein the ambient light sensor can acquire whether the user wears the earphone according to the brightness of ambient light, and the proximity sensor can determine that the user needs to wear the earphone when the wireless earphone moves to the ear. As one type of motion sensor, the accelerometer sensor can detect the magnitude of acceleration in each direction (generally, three axes), and can detect the magnitude and direction of gravity when the wireless headset is stationary, and can be used for recognizing the gesture of the wireless headset, such as picking up the headset, wearing the headset, and the like, and related functions of vibration recognition (such as pedometer and tapping). The proximity sensor can also realize non-contact control, such as corresponding gestures made by a user, and the like, so that more operation modes are provided. The wireless headset can further comprise a fingerprint sensor, and functions such as safety verification can be achieved by reading fingerprints, and therefore gestures of a user can be recognized. The wireless headset may also be provided with a capacitive sensor or the like, by which the user may output a corresponding control signal, such as switching songs, identification, etc. One or more buttons may also be provided on the housing of the wireless headset. The button can realize various modes such as short-time pressing, long-time pressing, rotation and the like, thereby realizing various operation effects. The number of the buttons can be multiple, and different buttons can be combined for use to realize multiple operation functions. The casing of the wireless earphone can be further provided with touch keys, and different operation functions can be realized through the touch keys.
The audio output control circuit 10 is provided with a wireless communication circuit, for example, a wireless chip U1, when the wireless earphone works, the wireless earphone can receive an audio signal output by a mobile terminal, for example, a mobile phone, a smart watch, a smart band, etc., and the audio output control circuit 10 performs signal processing on the received audio signal, for example, decoding and format conversion, and then outputs the audio signal, so as to realize audio playing. The audio output control circuit 10 may obtain a key trigger signal of the user through a key arranged on the wireless headset housing while receiving the audio signal, or obtain a gesture of the user through a sensor arranged in the wireless headset, such as an ambient light sensor and a proximity sensor, for example, operation signals such as the number of strokes from beside the headset, or determine whether the user wears the wireless headset through the proximity sensor, or obtain a head movement operation signal of the user, such as shaking head, nodding head, and the like, through an acceleration sensor, to determine a usage scenario currently required by the user, so as to output different control signals. The audio output control circuit 10 can also obtain the control signal of the user based on the mobile terminal or application software (APP) through the wireless communication circuit.
Specifically, when it is determined that the user does not want to disturb others at this time and needs to wear the earphone to receive audio information, the wireless earphone is equivalent to a conventional wireless earphone, and the audio output control circuit 10 outputs the first control signal. When receiving the output selection signal and determining that the user needs to share information with more people when the user needs to play audio, and needs to play the information with a large volume to ensure that each person can hear clearly, the wireless earphone is equivalent to a sound box, and the audio output control circuit 10 outputs a second control signal.
The audio channel switching circuit 20 is provided with two output terminals, one of which is connected to the speaker SPK1 through the audio amplifying circuit 30, and one of which is directly connected to the speaker SPK 1. The audio amplifier circuit 30 can amplify the received audio signal for a second time, so as to achieve the effect of a sound box, and enable more people to hear the sound signal. When receiving the first control signal, the audio channel switching circuit 20 connects the path between the audio output control circuit 10 and the speaker SPK1, so that the audio signal output by the audio output control circuit 10 is output through the audio channel switching circuit 20 and directly output to the speaker SPK1 for audio playing. When receiving the second control signal, the audio channel switching circuit 20 connects the path between the audio output control circuit 10 and the audio amplifying circuit 30, so that the audio signal output by the audio output control circuit 10 is output to the audio amplifying circuit 30 through the audio channel switching circuit 20, and after performing secondary amplification on the audio signal, the audio signal is output to the speaker SPK1 for audio playing. So, can realize the multiplexing of wireless earphone's audio amplifier and earphone function, portable to can solve the user when needs sound is played outward, need carry the audio amplifier simultaneously because the volume undersize of earphone. The audio amplifier circuit 30 may be implemented by a power amplifier chip or a power amplifier circuit composed of discrete components such as a triode and an operational amplifier.
The utility model discloses a set up audio output control circuit 10 and receive the output optional signal that the user triggered, and according to the output optional signal that receives, export first control signal or second control signal to audio channel switching circuit 20, audio channel switching circuit 20 when receiving first control signal, directly export the audio signal that audio output control circuit 10 output to speaker SPK 1; when receiving the second control signal, the audio signal output by the audio output control circuit 10 is output to the audio amplifier circuit 30, so that the audio signal is subjected to audio amplification processing and then output to the speaker SPK 1. The utility model discloses can be according to user's demand, when the user wants to use the audio amplifier function, carry out the secondary with audio signal and enlarge the back and play out through speaker SPK1 to realize the audio information sharing. When the user wants to use the normal function of the headset, the audio signal is directed through the speaker SPK1 into the wearer's ear to avoid disturbing others. The utility model discloses can realize switching and multiplexing of earphone conventional function and audio amplifier function, satisfy the user's application demand under different scenes.
Referring to fig. 1 and 2, in an embodiment, the audio output channel control circuit further includes:
a key signal output circuit 40, the output end of which is connected with the input end of the audio output control circuit 10; the key signal output circuit 40 is configured to output a corresponding key signal when a key is triggered, so that the audio output control circuit 10 outputs the first control signal or the second control signal according to an output selection signal corresponding to the key signal.
In this embodiment, the casing of the wireless headset may be provided with a key switch SW1 to output different output selection signals according to the output selection signals corresponding to the key signals, for example, at least the key switch SW1 may be provided on the casing to output different output selection signals, or the same key switch SW1 may be used to output different output selection signals.
The key signal output circuit 40 may be specifically implemented by a key switch SW1, a current limiting resistor R1 and a first esd diode D1, wherein one end of the key switch SW1 is grounded, and the other end is connected to the audio output control circuit 10 through the current limiting resistor R1; one end of the first esd 1 is connected to the common terminal of the keyswitch SW1 and the current limiting resistor R1, and the other end is grounded.
The current limiting resistor R1 is used to prevent the current output to the audio output control circuit 10 from being too large and damaging the components in the audio output control circuit 10. The current limiting resistor R1 can also realize the pull-down of the key signal, improving the sensitivity of the audio output control circuit 10 to the output selection signal. The first esd protection diode D1 is used for absorbing the static electricity at the end of the key switch SW 1. When the circuit works normally, the first electrostatic protection diode D1 is in the high-impedance state 5, and the normal operation of the circuit is not affected. When abnormal overvoltage occurs in the circuit and the breakdown voltage is reached, the first esd protection diode D1 changes from a high resistance state to a low resistance state, providing a low impedance conduction path for transient current, and clamping the abnormal high voltage within a safe range to prevent the audio output control circuit 10 from being damaged by the excessive voltage. When the abnormal overvoltage disappears, the first esd protection diode D1 returns to the high-resistance state, and the circuit operates normally.
The key switch SW1 may be provided at both earplugs, and may be a mechanical key switch SW1, a rocker type key switch SW1, a rotary type key switch SW1 or a multi-function combination type key switch SW1, which is not limited herein. The key switch SW1 outputs different key signals based on the user's trigger, and the key signals may be key signals with different time lengths or key signals with different times, for example, m seconds indicates that the user wants to use the speaker function, and n seconds indicates that the user wants to use the earphone function. And m ≠ n, m can be specifically set to be 1-2 seconds, n can be set to be 3-5 seconds, and different output selection signals are output by long pressing or short pressing the key switch SW 1. Alternatively, the continuous key 1 time indicates that the user wants to use the speaker function, and the continuous key 2 times indicates that the user wants to use the headphone function. Or, the odd number indicates that the user wants to use the speaker function, and the even number indicates that the user wants to use the earphone function. Different output selection signals are output according to different key times. In the present embodiment, the example is described in which the key switch SW1 is pressed for a long time or a short time to output different output selection signals, specifically, when the user wants to use the speaker function, the key switch SW1 m seconds is pressed, so that the audio output control circuit 10 outputs the first control signal when receiving the m seconds of key signal. When the user wants to use the conventional headphone function, the key switch SW1 is pressed for n seconds to cause the audio output control circuit 10 to output the second control signal when receiving the n seconds of key signal.
Referring to fig. 1 and 2, in an embodiment, the audio output control circuit 10 includes a wireless chip U1, and an output terminal of the wireless chip U1 is an audio signal output terminal of the audio output control circuit 10; the wireless chip U1 is configured to receive an output selection signal corresponding to the key signal and output a first control signal or a second control signal;
and/or the wireless chip U1 is configured to receive an output selection signal corresponding to the wireless communication signal and output the first control signal or the second control signal.
The wireless chip U1 can be wireless communication chips such as bluetooth, WIFI, infrared communication, and wireless chip U1 realizes wireless communication with external mobile terminals such as cell-phone, panel computer, remote control unit that cooperate the use to receive the audio signal that external mobile terminal received or output selection signal.
The wireless chip U1 may be implemented by a dedicated wireless headset control chip in a wireless headset, such as a bluetooth chip, or may be implemented by a separate microprocessor, which is not limited herein. Those skilled in the art 10 can monitor the wireless headset as a whole by integrating some hardware circuits and software programs or algorithms in the wireless chip U1, connecting various parts of the whole wireless headset with various interfaces and lines, executing or executing software programs and/or modules in the wireless chip U1, and calling up data in the wireless chip U1, performing various functions of the wireless headset and processing the data. In some embodiments, a hardware circuit module and/or a software program module for processing an audio signal may be generally integrated in the wireless chip U1, for example, a bluetooth chip, so that the bluetooth chip may output the received audio signal to the speaker SPK1 after performing signal processing such as decoding and amplification on the received audio signal, or output the voice signal received by the microphone to an external mobile terminal in a wireless communication manner after performing signal processing such as encoding on the received voice signal, thereby implementing input/output of the audio signal. It can be understood that, in the external mobile terminal, for example, the mobile phone may further be provided with application software (APP), through which the communication connection with the audio wireless chip U1 may be implemented, and the switching between the speaker function and the earphone function of the wireless earphone may be implemented. The application software (APP) is provided with an operation interface and a display interface, and the display interface can be used for displaying the working condition of the wireless earphone. The operation interface can be used for selecting and switching between the sound box function and the earphone function of the wireless earphone. The wireless chip U1 may receive the audio signal, and receive the output selection signal in a wired or wireless manner, and output the first control signal or the second control signal according to the output selection signal when outputting the audio signal according to the output selection signal.
Referring to fig. 1 and 2, in an embodiment, the audio channel switching circuit 20 includes a switch chip U2, an input terminal of the switch chip U2 is an input terminal of the audio channel switching circuit 20, an enable terminal of the switch chip U2 is a controlled terminal of the audio channel switching circuit 20, and two output terminals of the switch chip U2 are connected to the input terminal of the audio amplifying circuit 30 and the speakers SPK1 in a one-to-one correspondence.
In this embodiment, the switch chip U2 may be an analog switch, and the analog switch has two output terminals and a common terminal, and different loops are selectively turned on according to different enable signals output by the audio output control circuit 10, specifically, different levels. For example, the first control signal may be a low level, and the second control signal may be a high level; or, the first control signal is at a high level, and the second control signal is at a low level. When a user wants to use the sound box function, the audio output control circuit 10 outputs a high-level control signal to an enable EN port of the switch chip U2, when EN is high level, the audio signal is output by the pin OUT2, an audio signal path is path2, the audio signal output by the OUT2 is amplified by the audio amplifying circuit 30, and then a large volume signal is played through the loudspeaker SPK1, so that the requirement of information sharing is met. When a user wants to use the conventional earphone function, the audio output control circuit 10 outputs a low-level control signal to an enable EN port of the switch chip U2, when EN is low level, the audio signal is output by the pin OUT1, an audio signal path is path1, and the audio signal enters the ear of a wearer through the loudspeaker SPK1 to avoid disturbing others.
Referring to fig. 1 and fig. 2, in an embodiment, the audio output channel control circuit further includes an audio processing circuit 50, an input end of the audio processing circuit 50 is connected to an output end of the audio output control circuit 10, and an output end of the audio processing circuit 50 is connected to the audio channel switching circuit 20.
In this embodiment, the audio processing circuit 50 may output the audio signal output by the audio output control circuit 10 to the audio channel switching circuit 20 after performing processing such as amplification, noise reduction, and sound effect processing.
Referring to fig. 1 and 2, in an embodiment, the audio output channel control circuit further includes an audio interference suppression circuit 60, and the audio interference suppression circuit 60 is serially disposed between the audio amplification circuit 30 and the speaker SPK 1.
The audio interference suppression circuit 60 includes a filter capacitor C1, an audio interference suppression unit B1, and a second esd protection diode D2; one end of the audio interference suppression unit B1 is connected to the output end of the audio amplification circuit 30, and the other end of the audio interference suppression unit B1 is connected to the speaker SPK 1; one end of the second esd protection diode D2 is connected to the common end of the audio interference suppressing unit B1 and the speaker SPK1, and the other end of the second esd protection diode D2 is connected to the common end; one end of the filter capacitor C1 is connected to the common end of the audio interference suppression unit B1 and the speaker SPK1, and the other end of the filter capacitor C1 is grounded.
In this embodiment, the filter capacitor C1 is used for filtering noise signals in the audio signal. The audio interference suppression unit B1 may be implemented by using a filter inductor or a magnetic coin or other elements capable of performing signal interference suppression, and the second static electricity protection diode D2 is used to absorb static electricity at the speaker SPK1 terminal. When the circuit works normally, the second esd protection diode D2 is in the high-impedance state 5, and the normal operation of the circuit is not affected. When abnormal overvoltage occurs in the circuit and the breakdown voltage is reached, the second esd protection diode D2 changes from a high resistance state to a low resistance state, providing a low impedance conduction path for transient current, clamping the abnormal high voltage within a safe range, and preventing the audio output control circuit 10 from being damaged by the excessive voltage. When the abnormal overvoltage disappears, the second esd protection diode D2 returns to the high-resistance state, and the circuit operates normally.
Referring to fig. 1 and 2, in the above embodiment, the audio output channel control circuit further includes filter capacitors C2 and C3, wherein the filter capacitor C2 is disposed in series between the common terminal of the audio amplifier circuit 30 and the switch chip U2 and the ground. The filter capacitor C3 is serially connected between the common terminal of the switch chip U2 and the audio amplifier circuit 30 and ground. The filter capacitors C2 and C3 are used for filtering the audio signals in the audio signals, and the purity of the audio signals is improved.
The utility model also provides a wireless earphone, which comprises a loudspeaker and the audio output channel control circuit; the detailed structure of the audio output channel control circuit can refer to the above embodiments, and is not described herein again; it can be understood that, because the utility model discloses used above-mentioned audio output channel control circuit among the wireless earphone, consequently, the utility model discloses wireless earphone's embodiment includes all technical scheme of the whole embodiments of above-mentioned audio output channel control circuit, and the technical effect who reaches is also identical, no longer gives unnecessary details here.
And the output end of the audio output channel control circuit is connected with the loudspeaker.
The wireless earphone is a head-wearing wireless earphone.
In this embodiment, the wireless headset further includes a microphone MIC, the speaker SPK1 and the microphone MIC are respectively connected to a wireless chip in the audio output channel control circuit, and the microphone MIC collects an audio signal around the wireless chip according to a control signal output by the wireless chip. The speaker SPK1 amplifies the audio signal received by the wireless headset and plays the amplified audio signal. It can be understood that an audio processing module is further disposed in the earphone, and the microphone MIC collects surrounding audio signals under the control of the wireless chip, and outputs the collected audio signals to the wireless chip after the audio signals are filtered, encoded and the like by the audio processing module or transmits the collected audio signals to an external mobile terminal by the wireless chip. In the wireless earphone, a serial communication module, an indicator light, a micro motor, a sensor and other components are usually arranged. The multiplexing of the earphone function and the sound box function of the wireless earphone, particularly the head-wearing wireless earphone, can be realized through the audio output channel control circuit.
The above is only the optional embodiment of the present invention, and not therefore the limit of the patent scope of the present invention, all of which are in the concept of the present invention, the equivalent structure transformation of the content of the specification and the drawings is utilized, or the direct/indirect application is included in other related technical fields in the patent protection scope of the present invention.
Claims (10)
1. An audio output channel control circuit applied to a wireless earphone, the audio output channel control circuit comprising:
an audio amplification circuit;
an audio output control circuit configured to output an audio signal and output a first control signal or a second control signal according to a received output selection signal;
the input end of the audio channel switching circuit is connected with the audio signal output end of the audio output control circuit, and the controlled end of the audio channel switching circuit is connected with the control end of the audio output control circuit; the audio channel switching circuit configured to output the audio signal to a speaker upon receiving the first control signal; and when the second control signal is received, the audio signal is output to the audio amplifying circuit so as to be output to the loudspeaker after audio amplification processing is carried out on the audio signal.
2. The audio output channel control circuit of claim 1, wherein the audio output channel control circuit further comprises:
the output end of the key signal output circuit is connected with the input end of the audio output control circuit; the key signal output circuit is configured to output a corresponding key signal when a key is triggered, so that the audio output control circuit outputs the first control signal or the second control signal according to an output selection signal corresponding to the key signal.
3. The audio output channel control circuit according to claim 2, wherein the key signal output circuit comprises a key switch, a current limiting resistor and a first esd diode, one end of the key switch is grounded, and the other end is connected to the audio output control circuit through the current limiting resistor; one end of the first electrostatic protection diode is connected with the common end of the key switch and the current-limiting resistor, and the other end of the first electrostatic protection diode is grounded.
4. The audio output channel control circuit of claim 1, wherein the audio output control circuit comprises a wireless chip, an output terminal of the wireless chip being an audio signal output terminal of the audio output control circuit; the wireless chip is configured to receive an output selection signal corresponding to the key signal and output a first control signal or a second control signal;
and/or the wireless chip is configured to receive an output selection signal corresponding to the wireless communication signal and output the first control signal or the second control signal.
5. The audio output channel control circuit according to claim 1, wherein the audio channel switching circuit includes a switch chip, an input terminal of the switch chip is an input terminal of the audio channel switching circuit, an enable terminal of the switch chip is a controlled terminal of the audio channel switching circuit, and two output terminals of the switch chip are connected to the input terminal of the audio amplifying circuit and the speaker in a one-to-one correspondence.
6. The audio output channel control circuit of claim 1 further comprising an audio processing circuit, an input of the audio processing circuit being connected to an output of the audio output control circuit, an output of the audio processing circuit being connected to the audio channel switching circuit.
7. The audio output channel control circuit of any of claims 1 to 6, further comprising an audio interference suppression circuit disposed in series between the audio amplification circuit and a speaker.
8. The audio output channel control circuit of claim 7, wherein the audio interference suppression circuit comprises a filter capacitor, an audio interference suppression unit, and a second ESD diode; one end of the audio interference suppression unit is connected with the output end of the audio amplification circuit, and the other end of the audio interference suppression unit is connected with the loudspeaker; one end of a second electrostatic protection diode is connected with the audio interference suppression unit and the common end of the loudspeaker, and the other end of the second electrostatic protection diode is connected; one end of the filter capacitor is connected with the audio interference suppression unit and the common end of the loudspeaker, and the other end of the filter capacitor is grounded.
9. A wireless headset comprising a speaker and an audio output channel control circuit according to any one of claims 1 to 8;
and the output end of the audio output channel control circuit is connected with the loudspeaker.
10. The wireless headset of claim 9, wherein the wireless headset is a wireless headset.
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| CN202021117943.XU CN212115639U (en) | 2020-06-16 | 2020-06-16 | Audio output channel control circuit and wireless earphone |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114554351A (en) * | 2022-01-28 | 2022-05-27 | 歌尔科技有限公司 | Audio transmission circuit, audio transmission method and electronic equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114554351A (en) * | 2022-01-28 | 2022-05-27 | 歌尔科技有限公司 | Audio transmission circuit, audio transmission method and electronic equipment |
| CN114554351B (en) * | 2022-01-28 | 2024-05-28 | 歌尔科技有限公司 | Audio transmission circuit, audio transmission method and electronic equipment |
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