CN111901727A - Audio control circuit and electronic equipment - Google Patents
Audio control circuit and electronic equipment Download PDFInfo
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- CN111901727A CN111901727A CN202010754820.5A CN202010754820A CN111901727A CN 111901727 A CN111901727 A CN 111901727A CN 202010754820 A CN202010754820 A CN 202010754820A CN 111901727 A CN111901727 A CN 111901727A
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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
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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
- H04R2203/00—Details of circuits for transducers, loudspeakers or microphones covered by H04R3/00 but not provided for in any of its subgroups
Abstract
The embodiment of the application provides an audio control circuit and electronic equipment. The audio control circuit comprises a grounding circuit, a first audio terminal and a second audio terminal; the grounding circuit comprises an impedance device, and the impedance value of the impedance device is adjustable; under the condition that the first audio terminal and the second audio terminal are connected with the grounding circuit in parallel, if the impedance device receives a first control signal, the impedance value of the impedance device is a first impedance, otherwise, the impedance value of the impedance device is a second impedance, wherein the first impedance value is smaller than the second impedance value. Therefore, under the condition that the impedance device is not needed to be used, the impedance device can be controlled through the first control signal, the impedance value of the impedance device is changed from the second impedance value to the first impedance value, the direct current impedance in the grounding circuit is reduced, and then the coupling between the first audio terminal and the second audio terminal is reduced, so that the crosstalk between signal paths can be improved.
Description
Technical Field
The present disclosure relates to electronic devices, and particularly to an audio control circuit and an electronic device.
Background
As the functions of the electronic device become more complex, the audio control circuit inside the electronic device also becomes more complex. Taking the earphone plug audio control circuit as an example, the earphone plug audio control circuit includes a left channel signal path, a right channel signal path, a microphone signal path, and a ground circuit.
At present, in order to prevent the radio frequency signal from interfering with the audio control circuit of the headphone plug, a signal shielding device, such as a magnetic bead or an inductor, is usually connected in series on the ground signal loop.
However, since the left channel signal path, the right channel signal path and the microphone signal path are commonly referenced to the ground circuit, impedance exists in the ground circuit, and since a signal shielding device is connected in series to the ground circuit, impedance in the ground circuit is increased, so that coupling between the headphone plug signal paths is increased, and further crosstalk of the headphone plug audio control circuit is increased, such as crosstalk between the left channel signal path and the right channel signal path, crosstalk between the left channel signal path or the right channel signal path and the microphone signal path causes loss to a line of the headphone plug circuit, so that signals loaded to loads in the left channel signal path, the right channel signal path and the microphone signal path are reduced, and further, working performance of the headphone plug is reduced. In summary, when the audio control circuit includes a plurality of audio control circuits, if the signal shielding device is connected in series to the circuit, the impedance of the ground circuit is increased, and the loss of the audio control circuit is further increased.
Content of application
In view of this, embodiments of the present application provide an audio control circuit and an electronic device to solve the problem of line loss caused by electronic devices in the audio control circuit in the prior art.
In a first aspect, to achieve the above object, the present application discloses an audio control circuit comprising a ground circuit, a first audio terminal, and a second audio terminal;
the grounding circuit comprises an impedance device, and the impedance value of the impedance device is adjustable;
under the condition that the first audio terminal and the second audio terminal are connected in parallel with the grounding circuit, if the impedance device receives a first control signal, the impedance value of the impedance device is a first impedance value, otherwise, the impedance value of the impedance device is a second impedance value, wherein the first impedance value is smaller than the second impedance value.
In a second aspect, the application discloses an electronic device comprising the audio control circuit of the first aspect.
It can be seen from the above technical solutions that, in the embodiment of the present application, the audio control circuit includes a ground circuit, a first audio terminal, and a second audio terminal; the grounding circuit comprises an impedance device, and the impedance value of the impedance device is adjustable; under the condition that the first audio terminal and the second audio terminal are connected with the grounding circuit in parallel, if the impedance device receives a first control signal, the impedance value of the impedance device is a first impedance, otherwise, the impedance value of the impedance device is a second impedance, wherein the first impedance value is smaller than the second impedance value. Therefore, under the condition that the impedance device is required to be used, the resistance value of the impedance device can be controlled to be the second resistance value so as to ensure the normal work of the impedance device; under the condition that the impedance device is not needed, the impedance device can be controlled through the first control signal, the impedance value of the impedance device is changed from the second impedance value to the first impedance value, the resistance formula of the parallel circuit can obtain that the resistance value of the loop is always smaller than the resistance value of the branch circuit, therefore, under the condition that the first impedance value is smaller than the second impedance value, the direct current impedance in the grounding circuit is reduced, and further the coupling between the first audio terminal and the second audio terminal is reduced, so that the crosstalk between signal paths can be improved, and the line loss of the circuit can be reduced. Therefore, the audio control circuit can effectively solve the problem of line loss caused by the impedance device connected in series with the grounding circuit of the audio control circuit in the prior art, and simultaneously improve the crosstalk problem of the first audio terminal and the second audio terminal of the audio control circuit.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings 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 application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a circuit diagram of an audio control circuit according to an embodiment of the present application;
fig. 2 is a circuit diagram of another audio control circuit of the headphone plug according to the 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 only a part of the embodiments of the present application, and not all of the embodiments. 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.
As shown in fig. 1, the audio control circuit includes a ground circuit 1, a first audio terminal 2, and a second audio terminal 3; the grounding circuit 1 comprises an impedance device 11, and the impedance value of the impedance device 11 is adjustable; in the case where the first audio terminal 2 and the second audio terminal 3 are connected in parallel to the ground circuit 1, if the impedance device 11 receives the first control signal, the impedance value of the impedance device 11 is a first impedance value, otherwise, the impedance value of the impedance device 11 is a second impedance value, where the first impedance value is smaller than the second impedance value.
The audio control circuit is used for transmitting different audio signals. For example, when the audio control circuit is applied to a headphone plug, the first audio terminal 2 and the second audio terminal 3 may transmit any two of a left channel signal, a right channel signal, or a microphone signal. The first and second audio terminals 2 and 3 may transmit left and right channel signals, or the first and second audio terminals 2 and 3 may transmit left and microphone signals, or the first and second audio terminals 2 and 3 may transmit right and microphone signals.
It should be noted that the audio control circuit may further include a third audio terminal and a fourth audio terminal, where the number of the audio terminals in the audio control circuit is determined according to the function of the audio control circuit in the electronic device, and the embodiment of the present application does not limit this.
Specifically, as shown in fig. 2, the first audio terminal 2 is a left audio signal terminal 21, and the second audio terminal 3 is a right audio signal terminal 22 or a recording signal terminal 23.
It should be noted that, when the audio control circuit is a part of the headphone plug line, the audio control circuit may include a left channel audio signal terminal 21 and a right channel audio signal terminal 22, where the left channel audio signal terminal 21 is used for transmitting an audio output signal generated in the electronic device to simulate the hearing range of the left ear of a human being, for example, a left channel signal in a song is generally a main music channel signal. The second audio terminal 3 is a right audio signal terminal 22, and the right audio signal terminal 22 is used for transmitting a sound output signal generated by simulating the hearing range of the right ear of a human in the electronic device, for example, the right audio signal in a song is generally the main audio channel. In addition, when the stereo signal is transmitted, since the stereo signal has a spatial distribution characteristic such as a certain degree of directional gradation, the same or different sound signals can be transmitted in the left channel audio signal terminal 21 and the right channel audio signal terminal 22, so that the user can directly hear the stereo sound.
Optionally, the audio control circuit further includes a third audio terminal; in the case where the first audio terminal 2 is a left audio signal terminal 21 and the second audio terminal 3 is a right audio signal terminal 22, the third audio terminal is a recording signal terminal 23, wherein the third audio terminal, the second audio terminal 3 and the first audio terminal 2 are connected in parallel.
Specifically, the audio control circuit includes a recording signal terminal 23 for transmitting the received sound signal. The left channel audio signal terminal 21, the right channel audio signal terminal 22 and the recording signal terminal 23 are connected in parallel, so that the headphone plug can play the left channel signal, the right channel signal and receive the sound signal at the same time. In general, when listening to a song, the left channel audio signal terminal 21 and the right channel audio signal terminal 22 operate simultaneously; when listening to the accompaniment and recording, the left channel audio signal terminal 21 and the recording signal terminal 23 work simultaneously; when listening to the original and recording, the left channel audio signal terminal 21, the right channel audio signal terminal 22 and the recording signal terminal 23 are simultaneously operated. Therefore, when the audio control circuit in the parallel connection of the left audio signal terminal 21, the right audio signal terminal 22 and the recording signal terminal 23 operates simultaneously, the dc impedance value in the grounding circuit 1 is increased by the presence of the impedance device 11, so as to increase the coupling between the left audio signal and the right audio signal or the microphone signal, which may result in crosstalk between the signals. At this time, the impedance value of the impedance device 11 may be controlled to reduce the direct current impedance in the ground circuit 1 to reduce the crosstalk between signals.
The first audio terminal 2 and the second audio terminal 3 are connected in parallel to the ground circuit 1, and the ground circuit 1 includes an impedance device 11 in a loop. The type of impedance device 11 is, among other things, relevant to the signal processing problem that needs to be solved in practice. For example, when the magnetic beads are used as the impedance device 11, interference of radio frequency signals, high frequency signals and spike signals in the audio control circuit can be prevented; when the impedance device 11 is an inductor, it can filter noise, suppress the interference of electromagnetic waves in the line, and prevent the loss of the frequency-modulated signal. Specifically, in the earphone plug, the impedance device 11 in the ground circuit 1 is a signal shielding device, and the signal shielding device mainly plays a role in isolating an interference signal. For example, when a low-frequency interference signal is generated in a headset plug line, the signal shielding device can be an inductor, a resistor, a capacitor or the like; when a high-frequency interference signal is generated in the earphone plug line, the signal shielding device can be a magnetic bead or a low-pass filter and the like; when radio frequency interference signals are generated in the earphone plug circuit, the signal shielding device can select magnetic beads; when the electromagnetic interference signal is generated in the earphone plug line, the signal shielding device can select an inductor. Of course, the type of the impedance device 11 is not limited in the embodiment of the present application, and a person skilled in the art may select the type of the impedance device 11 according to the actual situation of the interference signal.
In the case where the first audio terminal 2 and the second audio terminal 3 are connected in parallel to the ground circuit 1, if the impedance device 11 receives the first control signal, the impedance value of the impedance device 11 is the first impedance, otherwise, the impedance value of the impedance device 11 is the second impedance, where the first impedance value is smaller than the first impedance value.
The first control signal is a control signal corresponding to a current application scenario of the electronic device. Specifically, in this embodiment of the application, the current application scenario of the electronic device may be an application operation scenario to be triggered by any operation instruction. The operation instruction may be any operation instruction included in the electronic device. Such as an operation instruction for making a call, an operation instruction for recording a sound, an operation instruction for playing music, and the like. For example, the electronic device receives a touch operation instruction of a user, or receives a user operation instruction such as a voice operation instruction of the user. For example, when a user issues a voice operation instruction for playing music, the electronic device may enter an application scene for playing music after receiving the voice operation instruction. The operation instruction corresponds to the application scenes corresponding to the operation instruction one by one. If the operation instruction is to make a call, the application scene is the application scene of making a call, and if the operation instruction is to play music, the application scene is the application scene of playing music. In many application scenarios corresponding to the operation instruction, some application scenarios may not affect the audio control circuit, and some application scenarios may affect the audio control circuit. If the audio control circuit is the earphone plug audio control circuit, the application scene of the shot picture can not affect the earphone plug signal circuit, and the application scene of the call can affect the earphone plug signal circuit.
Specifically, after the current application scenario is determined, it may be determined whether the impedance device 11 needs to be acted in the application scenario, for example, in the application scenario of making a call, devices such as a magnetic bead need to be acted to shield the radio frequency signal. In the case of an action of the impedance device 11, the first control signal is a control signal corresponding to a current application scenario of the electronic device. The control signal may change the impedance value of the impedance device 11, such as changing the impedance value of the impedance device 11 from the second impedance value to the first impedance value. Thus, when the resistance value of the impedance device 11 is changed from the second impedance value to the first impedance value, the impedance value of the ground circuit 1 after being connected in parallel is reduced because the first impedance value is smaller than the second impedance value, so that the direct current impedance in the ground circuit 1 can be reduced, the coupling between the first audio terminal 2 and the second audio terminal 3 can be reduced, the crosstalk between the first audio terminal 2 and the second audio terminal 3 can be improved, and the line loss of the audio control circuit can be reduced.
Alternatively, the impedance device 11 may include an impedance element 111 and an impedance adjusting piece 112, and the impedance adjusting piece 112 and the impedance element 111 are connected in parallel to the ground circuit 1.
In particular, the impedance element 111 is used to shield external interference signals of the audio control circuit. For example, when a phone call is made using a headphone plug, a radio frequency signal is generated in the headphone plug line, and the impedance element 111 is required to prevent the radio frequency signal from interfering with the audio signal.
Optionally, the impedance element 111 is any one of a resistor, a capacitor, an inductor, a diode, a triode, and a board-to-board connector.
The impedance element 111 may be a broad range of electronic devices, and may be any of a resistor, a capacitor, an inductor, a diode, a transistor, and a board-to-board connector, for example. The impedances of the resistor, the capacitor, the inductor, the diode and the triode in the circuit and the contact impedance of the circuit connector are all far larger than the conduction impedance of the impedance adjusting piece 112, and the resistance value of the impedance element 111 can be reduced by connecting the impedance adjusting piece 112 and the impedance element 111 in parallel, so that when the impedance element 111 is not needed to be used, the impedance value in the circuit can be reduced by reducing the impedance value of the impedance adjusting piece 112, the circuit loss of the grounding circuit 1 is reduced, and the signal transmission efficiency of the electronic equipment is improved. It should be noted that the board-to-board connector is a connecting device for connecting two circuit boards, and when one end of the ground circuit 1 is connected to the board-to-board connector, the resistance of the board-to-board connector also affects the resistance of the ground circuit 1, so that the board-to-board connector and the switch module can be connected in parallel, and when a control signal sent by the circuit board needs to be received, the switch module is disconnected, so that the ground circuit 1 can normally transmit the control signal sent by the circuit board. When the control signal sent by the circuit board does not need to be received, the switch module is closed, so that the impedance of the grounding circuit 1 is reduced, the line loss of the grounding circuit 1 is reduced, and the signal transmission efficiency of the electronic equipment is improved.
Optionally, the impedance adjusting element 112 is an adjustable resistor or a switch module.
In particular, in case the impedance adjusting member 112 is an adjustable resistor, the switch module and the resistorThe impedance element 111 is connected in parallel, and is used for shielding external interference signals of the audio control circuit, and the switch module may receive a first control signal corresponding to a current scene of the electronic device and perform a closing or opening operation according to the first control signal. For example, when a phone call is made with an earphone plug, a radio frequency signal is generated in the earphone plug line, the impedance element 111 is needed to prevent the radio frequency signal from interfering with an audio signal, and the switch module can be controlled to be turned off to ensure that the impedance element 111 is normally used. In a scenario where the impedance element 111 is not needed, for example, when the headphone plug is used to listen to the lyrics and accompaniment of a song, the presence of the impedance element 111 may cause the dc impedance in the headphone plug line to become large, which may increase the coupling between the left channel signal and the right channel signal of the headphone plug, and may cause crosstalk between the left channel signal and the right channel signal. At this time, the switch module can be controlled to be closed, since the on-resistance value of the switch module itself is smaller than the resistance value of the resistance element 111, and the resistance formula "R" of the parallel circuit is usedGeneral assembly＝r1*r2/(r1+r2) "it can be obtained that when the switch module and the impedance element 111 are turned on, the resistance value of the ground circuit 1 is inevitably smaller than that of the impedance element 111, and when the resistance value of the switch module is infinitely small, the resistance value of the ground circuit 1 also tends to be infinitely small. Therefore, connecting the switch modules in parallel in the circuit of the ground circuit 1 can reduce the impedance value in the ground circuit 1 in this scenario, and can reduce the coupling between the first audio terminal 2 and the second audio terminal 3 to improve the crosstalk between the first audio terminal 2 and the second audio terminal 3. At the same time, the line loss in the ground circuit 1 can also be reduced. In addition, when the audio control circuit is applied to the headphone line and the speaker line, the series impedance of the lines can be reduced by closing the switch module to short-circuit the series impedance element 111, so that the line loss in the headphone line and the speaker line can be reduced.
It should be noted that the switch module may be an electronic switch or other electronic devices with a resistance value smaller than that of the impedance element 111, which is not limited in this embodiment of the application. For example, in a possible implementation manner, the switch module may be a switch chip, and since the resistance value of the switch chip is small, in the case of being connected in parallel with the impedance element 111, it may be considered that the impedance element 111 is in a short circuit condition, so that the resistance value of the ground circuit 1 may tend to 0, and the impedance value of the ground circuit 1 is further reduced. In another possible implementation manner, the switch module may be an electronic device with a built-in switch contact, a resistance value of the electronic device is smaller than a resistance value of the impedance element 111, when the impedance element 111 does not need to work, the switch contact may be closed, so that the electronic device and the impedance element 111 are connected in parallel, which may be obtained by a parallel resistance formula, and in a case that the resistance value of the electronic device is smaller than the impedance element 111, a loop resistance value after the electronic device and the impedance element 111 in the ground circuit 1 are connected in parallel is smaller than a resistance value of the impedance element 111, so that the impedance of the ground circuit 1 may be reduced.
Further, in this embodiment, the initial state of the switch module may be a conducting state, for example, the state of the switch module after the electronic device is turned on is a conducting state. In this way, when the application program calling the radio frequency unit exists in the currently running application programs, the state of the switch module is changed into the closed state through the control signal. In addition, the radio frequency unit of the electronic device includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and other devices that can perform information interaction with a network and other devices through a wireless communication system, which is not limited in this embodiment of the present application.
In addition, in the case where the impedance adjusting member 112 is an adjustable resistor, the adjustable resistor and the impedance element 111 are connected in parallel in the ground circuit 1, and the adjustable resistor may receive a first control signal corresponding to a current scene of the electronic device and adjust a resistance value of the adjustable resistor according to the first control signal. For example, when a phone call is made with an earphone plug, a radio frequency signal is generated in the earphone plug line, the impedance element 111 is needed to prevent the radio frequency signal from interfering with the audio signal, and the resistance value of the adjustable resistor can be adjusted to ensure that the impedance element 111 is normally used. In scenarios where the impedance element 111 is not required, for example, using a headphone plug to listen to a song of a song simultaneouslyThe presence of the impedance element 111, together with the accompanying words, may cause the dc impedance in the headphone plug line to become large, which may increase the coupling between the left channel signal and the right channel signal of the headphone plug, which may result in crosstalk between the left channel signal and the right channel signal. At this time, the resistance of the adjustable resistor can be reduced by the resistance formula "R" of the parallel circuitGeneral assembly＝r1*r2/(r1+r2) "it can be obtained that when the resistance value of the adjustable resistor is decreased, the resistance value of the ground circuit 1 is necessarily smaller than the resistance value of the impedance element 111, and in the case where the resistance value of the adjustable resistor is infinitely small, the resistance value of the ground circuit 1 also tends to be infinitely small. Therefore, connecting the switch modules in parallel in the circuit of the ground circuit 1 can reduce the impedance value in the ground circuit 1 in this scenario, and can reduce the coupling between the first audio terminal 2 and the second audio terminal 3 to improve the crosstalk between the first audio terminal 2 and the second audio terminal 3. At the same time, the line loss in the ground circuit 1 can also be reduced. In addition, when the audio control circuit is applied to the headphone line and the speaker line, the series impedance of the lines can be reduced by closing the switch module to short-circuit the series impedance element 111, so that the line loss in the headphone line and the speaker line can be reduced.
Optionally, the audio control circuit further includes a detection circuit 4; the detection circuit 4 is respectively connected with the first audio terminal 2 and the second audio terminal 3 in series and is connected to the grounding circuit 1; the detection circuit 4 is a connection terminal for detecting the connection status of the first audio signal terminal, the second audio terminal 3 and the ground circuit 1.
Specifically, the detection circuit 4 is configured to detect an operation condition of a path formed by the first audio terminal 2 and the second audio terminal 3 and the ground circuit 1, respectively, where the first audio terminal 2, the second audio terminal 3 and the detection circuit 4 are connected in series, and the operation condition of the path refers to an operation state of a signal path of each branch in the signal path. Taking an earphone plug as an example, the audio control circuit is applied to an earphone plug circuit, a signal path in the audio control circuit is connected with the grounding circuit 1 in series, the detection circuit 4 is connected with the signal path in series, when the earphone plug is inserted into an earphone plug hole of the electronic device, the detection circuit 4 is in contact electrical connection with a detection contact in the earphone plug hole, the electronic device can detect that the earphone plug is in a state of being inserted into the earphone plug hole, and the electronic device can perform signal transmission with the earphone plug. When the earphone plug is pulled out from the earphone plug hole of the electronic device, the detection circuit 4 is disconnected from the detection contact in the earphone plug hole, and the electronic device can detect that the earphone plug is in a pulled-out state. In the audio control circuit of the headphone plug, the operation condition of the path refers to the state of insertion and extraction of the headphone, and it can also be understood that the detection circuit 4 is used to detect the operation state of one or two of the first audio terminal 2, the second audio terminal 3, and the third audio terminal.
As can be seen from the above technical solutions, in the embodiment of the present application, the audio control circuit includes a ground circuit 1, a first audio terminal 2, and a second audio terminal 3; the grounding circuit 1 comprises an impedance device 11, and the impedance value of the impedance device 11 is adjustable; in the case where the first audio terminal 2 and the second audio terminal 3 are connected in parallel to the ground circuit 1, if the impedance device 11 receives the first control signal, the impedance value of the impedance device 11 is a first impedance, otherwise, the impedance value of the impedance device 11 is a second impedance, where the first impedance value is smaller than the second impedance value. Therefore, in the case that the impedance device 11 needs to be used, the resistance value of the impedance device 11 can be controlled to be the second impedance value to ensure that the impedance device 11 works normally; under the condition that the impedance device 11 is not needed, the impedance device 11 can be controlled by the first control signal, the impedance value of the impedance device 11 is changed from the second impedance value to the first impedance value, and the resistance formula of the parallel circuit can obtain that the resistance value of the loop is always smaller than the resistance value of the branch, so that under the condition that the first impedance value is smaller than the second impedance value, the direct current impedance in the grounding circuit 1 is reduced, and further the coupling between the first audio terminal 2 and the second audio terminal 3 is reduced, so that the crosstalk between signal paths can be improved, and the line loss of the circuit can be reduced. Therefore, the audio control circuit can effectively solve the problem of line loss caused by the impedance device 11 connected in series with the grounding circuit 1 of the audio control circuit in the prior art, and simultaneously improve the crosstalk problem of the first audio terminal 2 and the second audio terminal 3 of the audio control circuit.
The embodiment of the present application further provides an electronic device, which includes the audio control circuit described in any of the above embodiments, and when the headphone plug is connected to the audio control circuit, the first audio terminal 2 and the second audio terminal 3 are connected in parallel to the ground circuit 1.
It should be noted that the electronic device may be: a cell phone, a tablet, an e-book reader, an MP3 player, an MP4 player, a laptop portable computer, a car computer, a desktop computer, a set-top box, a smart television, or a wearable device.
Optionally, the electronic device further includes a control module 5, and the control module 5 outputs the first control signal.
Specifically, the control module 5 may be disposed in a circuit of the impedance device 11, and the control module 5 may be integrated in the switch module, or may be electrically connected to the adjustable resistor, so as to control the impedance value of the impedance device 11 through an electrical signal. Thus, in a possible implementation manner, when the impedance device 11 in the grounding circuit 1 is not needed to be used, the control module 5 outputs the first control signal, so that the impedance value of the impedance device 11 is the first impedance value; when the impedance device 11 in the grounding circuit 1 needs to be used to ensure the impedance device 11 is normally used, the impedance device 11 may be at the second impedance value. In another possible implementation manner, when the impedance adjusting element 112 is a switch module, the control module 5 may be one of contact points, where the contact points are used to control on/off of a circuit of the switch module, and when the impedance element 11 in the ground circuit 1 is not required to be used, the control module 5 may control the circuit of the switch module and a parallel circuit of the impedance element 11 to be conducted, so as to reduce an impedance value of the ground circuit 1, and when the impedance element 11 in the ground circuit 1 is required to be used, the control module 5 may enable the circuit of the switch module to be in an open circuit state, so as to ensure normal use of the impedance element 11.
Optionally, the control module 5 outputs the first control signal according to an application scenario.
It should be noted that, in the embodiment of the present application, the current application scenario of the electronic device may be an application operation scenario to be triggered by any operation instruction. The operation instruction may be any operation instruction included in the electronic device. Such as an operation instruction for making a call, an operation instruction for recording a sound, an operation instruction for playing music, and the like. For example, the electronic device receives a touch operation instruction of a user, or receives a user operation instruction such as a voice operation instruction of the user. For example, when a user issues a voice operation instruction for playing music, the electronic device may enter an application scene for playing music after receiving the voice operation instruction. The operation instruction corresponds to the application scenes corresponding to the operation instruction one by one. If the operation instruction is to make a call, the application scene is the application scene of making a call, and if the operation instruction is to play music, the application scene is the application scene of playing music. In many application scenarios corresponding to the operation instruction, some application scenarios may not affect the audio control circuit, and some application scenarios may affect the audio control circuit. If the audio control circuit is the earphone plug audio control circuit, the application scene of the shot picture can not affect the earphone plug signal circuit, and the application scene of the call can affect the earphone plug signal circuit. Specifically, when the current application scenario is determined, and when some application scenarios do not require the use of the impedance device 11, the impedance value of the impedance device 11 may be changed to the first impedance value by the first control signal. The electronic device has the same beneficial effect as the audio control circuit, which is not described herein again.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Further, it should be noted that the scope of the methods and apparatus of the embodiments of the present application is not limited to performing the functions in the order illustrated or discussed, but may include performing the functions in a substantially simultaneous manner or in a reverse order based on the functions involved, e.g., the methods described may be performed in an order different than that described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.
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 (10)
1. An audio control circuit, comprising a ground circuit, a first audio terminal and a second audio terminal;
the grounding circuit comprises an impedance device, and the impedance value of the impedance device is adjustable;
under the condition that the first audio terminal and the second audio terminal are connected in parallel with the grounding circuit, if the impedance device receives a first control signal, the impedance value of the impedance device is a first impedance value, otherwise, the impedance value of the impedance device is a second impedance value, wherein the first impedance value is smaller than the second impedance value.
2. The audio control circuit according to claim 1, wherein the first audio terminal is a left channel audio signal terminal, and the second audio terminal is a right channel audio signal terminal or a recording signal terminal.
3. The audio control circuit of claim 2, further comprising a third audio terminal;
and under the condition that the first audio terminal is the left channel audio signal terminal and the second audio terminal is the right channel audio signal terminal, the third audio terminal is the recording signal terminal, wherein the third audio terminal, the second audio terminal and the first audio terminal are connected in parallel.
4. The audio control circuit of claim 1, further comprising a detection circuit;
the detection circuit is respectively connected with the first audio terminal and the second audio terminal in series and is connected to the grounding circuit;
the detection circuit is a wiring terminal for detecting the communication condition of the first audio signal terminal, the second audio terminal and the grounding circuit.
5. The audio control circuit of claim 1, wherein the impedance device comprises an impedance element and an impedance adjuster;
the impedance adjusting member and the impedance element are connected in parallel to the ground circuit.
6. The audio control circuit of claim 5, wherein the impedance adjuster is an adjustable resistor or a switch module.
7. The audio control circuit of claim 5, wherein the impedance element is any one of a resistor, a capacitor, an inductor, a diode, a transistor, and a board-to-board connector.
8. An electronic device, characterized in that the electronic device comprises an audio control circuit according to any of claims 1-7, the first audio terminal and the second audio terminal being connected in parallel to the ground circuit when a headphone plug is connected to the audio control circuit.
9. The electronic device of claim 8, further comprising a control module that outputs the first control signal.
10. The electronic device of claim 9, wherein the control module outputs the first control signal according to an application scenario.
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| CN202010754820.5A CN111901727A (en) | 2020-07-30 | 2020-07-30 | Audio control circuit and electronic equipment |
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| CN202010754820.5A CN111901727A (en) | 2020-07-30 | 2020-07-30 | Audio control circuit and electronic equipment |
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Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101316111A (en) * | 2008-07-23 | 2008-12-03 | 嘉兴闻泰通讯科技有限公司 | Mobile terminal headphone |
| CN101359764A (en) * | 2007-07-30 | 2009-02-04 | 宏达国际电子股份有限公司 | Earphone antenna and connector thereof |
| CN101951268A (en) * | 2010-07-23 | 2011-01-19 | 惠州Tcl移动通信有限公司 | Method and device for improving performance of radio antenna |
| CN102571112A (en) * | 2010-12-28 | 2012-07-11 | 深圳富泰宏精密工业有限公司 | Portable electronic device |
| US20130156238A1 (en) * | 2011-11-28 | 2013-06-20 | Sony Mobile Communications Ab | Adaptive crosstalk rejection |
| CN203574819U (en) * | 2013-09-13 | 2014-04-30 | 深圳市金立通信设备有限公司 | Earphone circuit and earphone |
| CN204465850U (en) * | 2015-04-16 | 2015-07-08 | 东莞市朝阳实业有限公司 | A kind of Anti-interference earphone circuit |
| CN106254983A (en) * | 2016-08-16 | 2016-12-21 | 深圳天珑无线科技有限公司 | A kind of handset earphone circuit |
| CN108632696A (en) * | 2017-03-17 | 2018-10-09 | 中兴通讯股份有限公司 | A kind of FM earphone bases circuit, voice frequency terminal and its control method |
| CN108810212A (en) * | 2018-08-28 | 2018-11-13 | 维沃移动通信有限公司 | A kind of terminal device and ground connection control method |
| CN208971784U (en) * | 2018-12-07 | 2019-06-11 | 歌尔科技有限公司 | A kind of electromagnetic interference noise suppression circuit and intelligent sound box |
| CN110719548A (en) * | 2018-07-12 | 2020-01-21 | 中兴通讯股份有限公司 | Audio processing device, audio crosstalk processing method and device |
| CN111432308A (en) * | 2020-03-30 | 2020-07-17 | 上海闻泰电子科技有限公司 | Audio communication circuit, electronic equipment and audio communication test system |
-
2020
- 2020-07-30 CN CN202010754820.5A patent/CN111901727A/en active Pending
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101359764A (en) * | 2007-07-30 | 2009-02-04 | 宏达国际电子股份有限公司 | Earphone antenna and connector thereof |
| CN101316111A (en) * | 2008-07-23 | 2008-12-03 | 嘉兴闻泰通讯科技有限公司 | Mobile terminal headphone |
| CN101951268A (en) * | 2010-07-23 | 2011-01-19 | 惠州Tcl移动通信有限公司 | Method and device for improving performance of radio antenna |
| CN102571112A (en) * | 2010-12-28 | 2012-07-11 | 深圳富泰宏精密工业有限公司 | Portable electronic device |
| US20130156238A1 (en) * | 2011-11-28 | 2013-06-20 | Sony Mobile Communications Ab | Adaptive crosstalk rejection |
| CN203574819U (en) * | 2013-09-13 | 2014-04-30 | 深圳市金立通信设备有限公司 | Earphone circuit and earphone |
| CN204465850U (en) * | 2015-04-16 | 2015-07-08 | 东莞市朝阳实业有限公司 | A kind of Anti-interference earphone circuit |
| CN106254983A (en) * | 2016-08-16 | 2016-12-21 | 深圳天珑无线科技有限公司 | A kind of handset earphone circuit |
| CN108632696A (en) * | 2017-03-17 | 2018-10-09 | 中兴通讯股份有限公司 | A kind of FM earphone bases circuit, voice frequency terminal and its control method |
| CN110719548A (en) * | 2018-07-12 | 2020-01-21 | 中兴通讯股份有限公司 | Audio processing device, audio crosstalk processing method and device |
| CN108810212A (en) * | 2018-08-28 | 2018-11-13 | 维沃移动通信有限公司 | A kind of terminal device and ground connection control method |
| CN208971784U (en) * | 2018-12-07 | 2019-06-11 | 歌尔科技有限公司 | A kind of electromagnetic interference noise suppression circuit and intelligent sound box |
| CN111432308A (en) * | 2020-03-30 | 2020-07-17 | 上海闻泰电子科技有限公司 | Audio communication circuit, electronic equipment and audio communication test system |
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Application publication date: 20201106 |