CN214481233U - Audio circuit assembly and electronic equipment - Google Patents
Audio circuit assembly and electronic equipment Download PDFInfo
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- CN214481233U CN214481233U CN202120951540.3U CN202120951540U CN214481233U CN 214481233 U CN214481233 U CN 214481233U CN 202120951540 U CN202120951540 U CN 202120951540U CN 214481233 U CN214481233 U CN 214481233U
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Abstract
The application discloses audio circuit subassembly and electronic equipment, this audio circuit subassembly includes: the audio codec and the loudspeaker are electrically connected through a first connecting circuit and a second connecting circuit, wherein a first resistor is connected in series in the second connecting circuit; the first connection circuit is used for transmitting an audio signal output by the audio codec to the speaker when the speaker is in a play-out mode; the second connection circuit is configured to transmit an audio signal output by the audio codec to the speaker when the speaker is in an earpiece mode.
Description
Technical Field
The application belongs to the technical field of terminals, and particularly relates to an audio circuit assembly and an electronic device.
Background
For better audio experience, more and more mobile phones use a dual speaker design, and the upper speaker is used as an earpiece in a handheld call scene.
In the working process of the loudspeaker, the power amplifier can draw a large current of about 2A from the battery connector in a 217Hz period, so that a variable current is generated on a power supply path, the variable current can enable a coil of the loudspeaker to generate a variable magnetic field, and the energy of the coupled magnetic field is larger due to the large area and the small impedance of the coil of the loudspeaker, so that the caused (Time Division duplex, TDD) noise is larger.
SUMMERY OF THE UTILITY MODEL
An object of the embodiment of the application is to provide an audio circuit assembly and an electronic device, which can solve the problem that a loudspeaker is easily interfered by noise when being in an earphone mode.
In order to solve the technical problem, the following technical scheme is adopted in the application:
in a first aspect, an embodiment of the present application provides an audio circuit assembly, including: the audio codec and the loudspeaker are electrically connected through a first connecting circuit and a second connecting circuit, wherein a first resistor is connected in series in the second connecting circuit; the first connection circuit is used for transmitting an audio signal output by the audio codec to the speaker when the speaker is in a play-out mode; the second connection circuit is configured to transmit the audio signal output by the audio codec to the speaker when the speaker is in an earpiece mode.
In a second aspect, an embodiment of the present application provides an electronic device, including the audio circuit assembly according to the first aspect.
The technical scheme adopted by the application can achieve the following beneficial effects:
the utility model provides an audio circuit subassembly, through first connecting circuit of electricity connection and second connecting circuit between audio codec and speaker, first resistance is established ties on second connecting circuit, through switching mode, when making the speaker be in the mode of putting outward, the audio signal of audio codec output transmits to the speaker through first connecting circuit, and when the speaker was in the earphone mode, the audio signal of making audio codec output transmits to the speaker through second connecting circuit. Because the first resistor is connected in series in the second connecting circuit, when the loudspeaker is in an earphone mode, the first resistor can divide voltage, voltage on the loudspeaker is reduced, and interference of TDD noise can be reduced.
Drawings
FIG. 1 is a schematic diagram of an audio circuit assembly according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a first structure of an audio circuit assembly according to an embodiment of the disclosure;
FIG. 3 is a schematic diagram of a second structure of an audio circuit assembly according to an embodiment of the disclosure;
FIG. 4 is a schematic diagram of a third structure of an audio circuit assembly disclosed in an embodiment of the present application;
FIG. 5 is a schematic diagram of a fourth configuration of an audio circuit assembly disclosed in an embodiment of the present application;
fig. 6 is a schematic diagram of a fifth structure of an audio circuit assembly disclosed in 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 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 is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application are capable of operation in sequences other than those illustrated or described herein. 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.
An audio circuit component provided by the embodiments of the present application is described in detail below with reference to the accompanying drawings through specific embodiments and application scenarios thereof.
Fig. 1 shows a schematic structural diagram of an audio circuit assembly disclosed in an embodiment of the present application, and as shown in fig. 1, the audio circuit assembly includes an audio codec 110 and a speaker 120, the audio codec 110 and the speaker 120 are electrically connected through a first connection circuit and a second connection circuit, wherein a first resistor R1 is connected in series in the second connection circuit. In the case where the speaker 120 is in the play-out mode, the first connection circuit is used to transmit the audio signal output by the audio codec 110 to the speaker 120; the second connection circuit is used to transmit the audio signal output by the audio codec 110 to the speaker 120 in the case where the speaker 120 is in the earpiece mode.
In the embodiment of the present application, when the speaker 120 is in the earpiece mode, the audio signal output by the audio codec 110 is transmitted to the speaker 120 through the second connection circuit, and since the first resistor R1 is connected in series in the second connection circuit, the first resistor R1 can divide the voltage, so that the voltage across the speaker 120 is reduced, and thus the noise interference can be reduced when the speaker 120 is in the earpiece mode.
In one possible implementation, as illustrated in fig. 2, the first connection circuit may include: the audio amplifier 130 and the first sub-connection circuit, wherein a first end of the audio amplifier 130 is electrically connected with the speaker 120 through the first sub-connection circuit; the second connection circuit may include: an audio amplifier 130 and a second sub-connection circuit, wherein a first terminal of the audio amplifier 130 is electrically connected to the speaker 120 through the second sub-connection circuit, and a first resistor R1 is connected in series between the audio amplifier 130 and the speaker 120; the circuit structure may further include: the control module is used for controlling the first sub-connection circuit to be connected and controlling the second sub-connection circuit to be disconnected under the condition that the loudspeaker 120 is in the outward playing mode; when the speaker 120 is in the earpiece mode, the control module is configured to control the first connection sub-circuit to be turned off and control the second connection sub-circuit to be turned on.
In this possible implementation, the first connection circuit may further include: a first on-off module connected in series between the audio amplifier 130 and the speaker 120; under the condition that the loudspeaker 120 is in the play-out mode, the control module is used for controlling the first on-off module to be in a conducting state; the control module is used for controlling the first on-off module to be in an off state under the condition that the loudspeaker 120 is in the earphone mode; in addition, the resistance value of the first on-off module is smaller than the first threshold value, so that the output of the audio signal is not affected when the speaker 120 is in the external mode.
The control module may include a general purpose interface GPIO, a second on-off module, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first capacitor C1, a diode D, and a control interface O, where a fourth resistor R4 is connected in series between a first end of the second on-off module and the general purpose interface GPIO; the second end of the second on-off module is electrically connected with a fifth resistor R5, and the first end of the second on-off module is grounded; the fifth resistor R5 is electrically connected with the control interface O; one end of the third resistor R3 is electrically connected to the first end of the audio amplifier 130, the other end of the third resistor R3 is electrically connected to one end of the first capacitor C1, and the other end of the first capacitor C1 is electrically connected to the control interface O; one end of the second resistor R2 is electrically connected to the boost pin VBST of the audio amplifier 130, and the other end is electrically connected to the control interface O; the control interface O is connected with the control end of the first on-off module.
In the possible implementation manner, when the speaker 120 is in the external-discharge mode, the general purpose interface GPIO is configured to input a first level, where the first level is used to control a connection between the first end of the second on-off module and the second end of the second on-off module to be in an off state, and the control interface O is used to control the first on-off module to be in an on state; when the speaker 120 is in the earpiece mode, the general purpose interface GPIO is configured to input a second level, where the second level is configured to control the first end of the second on-off module and the second end of the second on-off module to be in an on state, and the control interface O is configured to control the first on-off module to be in an off state.
In an alternative, the first switching module comprises: two back-to-back connected MOS transistors, such as the back-to-back connected MOS transistor Q1 and the back-to-back connected MOS transistor Q2 in fig. 2, can avoid reverse leakage generated by parasitic diodes in the MOS transistors. Optionally, the second disconnection module may include: and a MOS transistor, such as the MOS transistor Q3 connected with the fourth resistor R4 in the figure 2.
In a specific application, when the speaker 120 is in the external discharge mode, the general purpose interface GPIO inputs a first level, the first level is low, the gate voltage transmitted to the MOS transistor Q3 through the fourth resistor R4 is not enough to turn on the MOS transistor Q3, the gate voltages connected back to the MOS transistor Q1 and the MOS transistor Q2 are raised by a bootstrap circuit composed of the third resistor R3 and the first capacitor C1, the MOS transistor Q1 and the MOS transistor Q2 are turned on, the first sub-connection circuit between the audio amplifier 130 and the speaker 120 is turned on, and then the first connection circuit is turned on, and the speaker 120 makes a sound.
In a specific implementation manner, the resistances of the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, and the fifth resistor R5 may be selected according to actual situations, which is not specifically limited in this application.
When the speaker 120 is in the earpiece mode, the general purpose interface GPIO inputs a second level, which is higher, the gate voltage transmitted to the MOS transistor Q3 through the fourth resistor R4 turns on the MOS transistor Q3, the gate voltages of the MOS transistor Q1 and the MOS transistor Q2 are divided and pulled down by the second resistor R2 and the fifth resistor R5, so that the MOS transistor Q1 and the MOS transistor Q2 are not turned on, the second sub-connection circuit between the audio amplifier 130 and the speaker 120 is turned on, and the second connection circuit is turned on, and the speaker 120 makes a sound.
It should be noted that, in the above application embodiment, the overcurrent capability of the MOS transistor Q1 and the MOS transistor Q2 may be greater than that of the speaker 120. When the second connection circuit is turned on and the voltage at the boost pin VBST is greater than a predetermined value, the MOS transistor Q1 and the MOS transistor Q2 cannot be turned on. The resistance of the first resistor R1 can be determined according to the maximum power of the speaker 120, so long as the speaker 120 is not burned. Alternatively, the first resistor R1 may be formed by connecting several resistors in parallel, as the case may be. For the bootstrap circuit composed of the third resistor R3 and the first capacitor C1, the time constant thereof may be greater than or equal to 3 times of the output period of the audio amplifier 130, so that the MOS transistor Q1 and the MOS transistor Q2 may be effectively ensured to be turned on. In addition, for the MOS transistor Q3, the withstanding voltage of the source voltage and the gate voltage of the MOS transistor Q3 may be greater than or equal to twice the voltage at the boost pin VBST, so that leakage of electricity when the speaker 120 emits maximum sound volume may be prevented.
In a possible implementation manner, as shown in fig. 3, the first switching module may further include: a first selector switch K1; the first terminal of the first selection switch K1 is electrically connected to the speaker 120, the second terminal of the first selection switch K1 is electrically connected to the first terminal of the audio amplifier 130, and the third terminal of the first selection switch K1 is electrically connected to the first terminal of the audio amplifier 130 through the first resistor R1.
In this possible implementation, in the case where the speaker 120 is in the play-out mode, the first terminal of the first selection switch K1 is in a connected state with the second terminal of the first selection switch K1, and the first terminal of the first selection switch K1 is in a disconnected state with the third terminal of the first selection switch K1; in the case where the speaker 120 is in the earpiece mode, the first terminal of the first selection switch K1 is in a connected state with the third terminal of the first selection switch K1, and the first terminal of the first selection switch K1 is in a disconnected state with the second terminal of the first selection switch K1.
Optionally, as shown in fig. 4, the first switching module may further include: and a second selector switch K2, wherein a first terminal of the second selector switch K2 is electrically connected to the speaker 120, a second terminal of the second selector switch K2 is electrically connected to the second terminal of the audio amplifier 130, and a third terminal of the second selector switch K2 is electrically connected to the second terminal of the audio amplifier through a sixth resistor R6.
In this alternative, in the case where the speaker 120 is in the play-out mode, the first terminal of the second selection switch K2 is in a connected state with the second terminal of the second selection switch K2, and the first terminal of the second selection switch K2 is in a disconnected state with the third terminal of the second selection switch K2; in the case where the speaker 120 is in the earpiece mode, the first terminal of the second selection switch K2 and the third terminal of the second selection switch K2 are in a connected state, and the first terminal of the second selection switch K2 and the second terminal of the second selection switch K2 are in an disconnected state.
In the above possible implementation manner, by controlling the first selection switch K1 and/or the second selection switch K2, when the speaker 120 is in the play mode, the first connection circuit is turned on, and when the speaker 120 is in the earphone mode, the second connection circuit is turned on, and the second connection circuit is connected in series with the first resistor R1, so that when the speaker 120 is in the earphone mode, the first resistor R1 divides voltage to reduce voltage across the speaker 120, thereby effectively avoiding noise interference.
Optionally, the second connection circuit may be connected in series with a plurality of resistors, and the corresponding setting may be made according to specific situations, which is not specifically limited in this application.
In one possible implementation, as shown in fig. 5, an audio amplifier 130 is connected in series in the first connection circuit, a first output terminal of the audio codec 110 is electrically connected to the audio amplifier 130, and a second output terminal of the audio codec 110 is electrically connected to the first resistor R1.
In this possible implementation, in the case that the speaker 120 is in the play-out mode, the audio codec 110 controls the first connection circuit to be turned on, controls the second connection circuit to be turned off, and the audio codec 110 outputs the audio signal through the first output terminal thereof. In case the speaker 120 is in the earpiece mode, the audio codec 110 controls the second connection circuit to be turned on, controls the first connection circuit to be turned off, and the audio codec 110 outputs the audio signal through the second output terminal thereof.
Optionally, in the case that the speaker 120 is in the play-out mode, the audio codec 110 is configured to control the electrical connection between the first output terminal thereof and the speaker 120 to be conducted; with speaker 120 in the earpiece mode, audio codec 110 is configured to control the electrical connection between its first output and speaker 120 to be broken. As shown in fig. 6, the third selection switch K3 and the fourth selection switch K4 are connected in series in the second connection circuit, the audio codec 110 can control the third selection switch K3 and the fourth selection switch K4 to be closed, and when the speaker 120 is in the play-out mode, the audio codec 110 controls the third selection switch K3 and the fourth selection switch K4 to be opened; when the speaker 120 is in the earpiece mode, the audio codec 110 controls the third selection switch K3 and the fourth selection switch K4 to be closed.
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 circuit assembly, comprising: an audio codec and a speaker, wherein,
the audio codec is electrically connected with the loudspeaker through a first connecting circuit and a second connecting circuit, wherein a first resistor is connected in series in the second connecting circuit;
the first connection circuit is used for transmitting an audio signal output by the audio codec to the speaker when the speaker is in a play-out mode;
and under the condition that the loudspeaker is in an earphone mode, the second connecting circuit is used for transmitting the audio signal output by the audio codec to the loudspeaker.
2. The audio circuit assembly of claim 1,
the first connection circuit includes: the first end of the audio amplifier is electrically connected with the loudspeaker through the first sub-connecting circuit;
the second connection circuit includes: the audio amplifier and a second sub-connecting circuit, wherein the first end of the audio amplifier is electrically connected with the loudspeaker through the second sub-connecting circuit, and the first resistor is connected between the audio amplifier and the loudspeaker in series;
the circuit assembly further includes: the control module is used for controlling the first sub-connection circuit to be conducted and controlling the second sub-connection circuit to be disconnected under the condition that the loudspeaker is in a loudspeaker playing mode; and under the condition that the loudspeaker is in an earphone mode, the control module is used for controlling the first sub-connection circuit to be disconnected and controlling the second sub-connection circuit to be connected.
3. The audio circuit assembly of claim 2,
the first connection circuit further includes: the first on-off module is connected between the audio amplifier and the loudspeaker in series;
the control module is used for controlling the first on-off module to be in a conducting state under the condition that the loudspeaker is in a loudspeaker playing mode; the control module is used for controlling the first on-off module to be in an off state under the condition that the loudspeaker is in an earphone mode;
and in a conducting state, the resistance value of the first on-off module is smaller than a first threshold value.
4. The audio circuit assembly of claim 3, wherein the control module comprises: a general interface, a second on-off module, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first capacitor, a diode and a control interface, wherein,
the fourth resistor is connected between the first end of the second on-off module and the universal interface in series;
the second end of the second on-off module is electrically connected with the fifth resistor, and the first end of the second on-off module is grounded;
the fifth resistor is electrically connected with the control interface;
one end of the third resistor is electrically connected with the first end of the audio amplifier, the other end of the third resistor is electrically connected with one end of the first capacitor, and the other end of the first capacitor is electrically connected with the control interface;
one end of the second resistor is electrically connected with a boosting pin of the audio amplifier, and the other end of the second resistor is electrically connected with the control interface;
the control interface is connected with the control end of the first on-off module;
under the condition that the loudspeaker is in an external amplification mode, the universal interface is used for inputting a first level, the first level is used for controlling a first end of the second on-off module and a second end of the second on-off module to be in an off state, and the control interface is used for controlling the first on-off module to be in an on state;
and under the condition that the loudspeaker is in an earphone mode, the universal interface is used for inputting a second level, the second level is used for controlling the first end of the second on-off module and the second end of the second on-off module to be in a conducting state, and the control interface is used for controlling the first on-off module to be in a disconnecting state.
5. The audio circuit assembly of claim 3 or 4, wherein the first switching module comprises: two MOS tubes connected back to back.
6. The audio circuit assembly of claim 4, wherein the second disconnection module comprises: a MOS tube.
7. The audio circuit assembly of claim 3, wherein the first switching module comprises: a first selection switch; wherein the content of the first and second substances,
a first end of the first selection switch is electrically connected with the loudspeaker, a second end of the first selection switch is electrically connected with a first end of the audio amplifier, and a third end of the first selection switch is electrically connected with the first end of the audio amplifier through the first resistor;
under the condition that the loudspeaker is in a play-out mode, a first end of the first selection switch and a second end of the first selection switch are in a connected state, and a first end of the first selection switch and a third end of the first selection switch are in a disconnected state;
when the loudspeaker is in an earphone mode, the first end of the first selection switch and the third end of the first selection switch are in a connected state, and the first end of the first selection switch and the second end of the first selection switch are in a disconnected state.
8. The audio circuit assembly of claim 7, wherein the first switching module further comprises: a second selection switch; wherein the content of the first and second substances,
a first end of the second selection switch is electrically connected with the loudspeaker, a second end of the second selection switch is electrically connected with a second end of the audio amplifier, and a third end of the second selection switch is electrically connected with the second end of the audio amplifier through a sixth resistor;
under the condition that the loudspeaker is in a play-out mode, a first end of the second selector switch and a second end of the second selector switch are in a connected state, and a first end of the second selector switch and a third end of the second selector switch are in a disconnected state;
when the loudspeaker is in an earphone mode, the first end of the second selector switch and the third end of the second selector switch are in a connected state, and the first end of the second selector switch and the second end of the second selector switch are in a disconnected state.
9. The audio circuit assembly of claim 1, wherein an audio amplifier is connected in series in the first connection circuit, a first output terminal of the audio codec is electrically connected to the audio amplifier, and a second output terminal of the audio codec is electrically connected to the first resistor; wherein the content of the first and second substances,
the audio codec is configured to output an audio signal through the first output terminal in a case where the speaker is in a play-out mode; the audio codec is configured to output an audio signal through the second output terminal when the speaker is in an earpiece mode; alternatively, the first and second electrodes may be,
under the condition that the loudspeaker is in a play-out mode, the audio codec is used for controlling the electric connection between the first output end and the loudspeaker to be conducted; the audio codec is configured to control an electrical connection between the first output and the speaker to be disconnected if the speaker is in an earpiece mode.
10. An electronic device comprising the audio circuit assembly of any of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120951540.3U CN214481233U (en) | 2021-04-30 | 2021-04-30 | Audio circuit assembly and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120951540.3U CN214481233U (en) | 2021-04-30 | 2021-04-30 | Audio circuit assembly and electronic equipment |
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| Publication Number | Publication Date |
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| CN214481233U true CN214481233U (en) | 2021-10-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120951540.3U Active CN214481233U (en) | 2021-04-30 | 2021-04-30 | Audio circuit assembly and electronic equipment |
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| CN (1) | CN214481233U (en) |
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- 2021-04-30 CN CN202120951540.3U patent/CN214481233U/en active Active
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