CN215072952U - AUX input circuit and audio playing system - Google Patents
AUX input circuit and audio playing system Download PDFInfo
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- CN215072952U CN215072952U CN202120102069.0U CN202120102069U CN215072952U CN 215072952 U CN215072952 U CN 215072952U CN 202120102069 U CN202120102069 U CN 202120102069U CN 215072952 U CN215072952 U CN 215072952U
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Abstract
The embodiment of the application belongs to the technical field of audio processing, and relates to an AUX input circuit, which comprises: the device comprises an interface module, a receiving module, a control module and an output module; the interface module is connected with the receiving module and transmits peripheral signals to the receiving module, wherein the peripheral signals comprise power signals and audio signals; the receiving module is used for receiving the peripheral signals; the control module is connected with the receiving module and used for closing the output function of the output module when the power supply signal is abnormal; the output module is connected with the control module and used for transmitting the audio signal to the power amplifier circuit when the power supply signal is normal. The application also relates to an audio playing system. The application provides a technical scheme can avoid the production of noise.
Description
Technical Field
The present application relates to the field of audio processing technologies, and in particular, to an AUX input circuit and an audio playing system.
Background
Many audio electronic products are provided with AUX (auxiliary) input interfaces, and AUX is an additional signal line design. During the use process, the actions of plugging and unplugging the AUX signal line, shutting down or powering off the AUX peripheral equipment and the like can all happen frequently, abnormal signals generated in the process can be transmitted to the playing equipment through the AUX line, and the playing equipment is caused to generate noise in different degrees.
For the reason of limiting the manufacturing cost of general low-end electronic products, the problem is neglected. For high-end products, a special chip with power failure detection is selected, when the power supply is shut down or powered off, the chip detects that the power supply voltage is lower than a set value, the signal output is automatically closed, and the problem of noise generated by a later stage is avoided. However, the chip detection will increase the manufacturing cost, and the problem of noise generated in the process of plugging and unplugging the AUX signal line cannot be solved.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the embodiment of the application is to solve the problem that the noise is generated due to abnormal signals generated by the actions of plugging and unplugging, shutdown, power failure and the like of an AUX peripheral in the use process of the equipment with the AUX input interface.
In order to solve the above technical problem, an embodiment of the present application provides an AUX input circuit, which adopts the following technical solutions:
the device comprises an interface module, a receiving module, a control module and an output module;
the interface module is connected with the receiving module and sends signals transmitted by peripheral equipment to the receiving module, and the signals comprise power signals and audio signals;
the receiving module is used for receiving the signal;
the control module is connected with the receiving module and used for
When the power supply signal is abnormal, the output function of the output module is closed;
the output module is connected with the control module and used for transmitting the audio signal to the power amplifier circuit when the power supply signal is normal.
Furthermore, the interface module is provided with a power supply voltage branch and a sound channel branch, the power supply voltage branch and the sound channel branch are electrically connected with the receiving module, the power supply voltage branch is used for transmitting the power supply signal, and the sound channel branch is used for transmitting the audio signal.
Further, the interface module further includes a grounding branch, and the grounding branch is grounded.
Furthermore, the receiving module comprises a voltage dividing unit, and the voltage dividing unit is connected with the interface module and the control module.
Further, the voltage division unit comprises a voltage stabilizing diode, a first resistor and a second resistor; the negative electrode of the voltage stabilizing diode is connected with the interface module, and the positive electrode of the voltage stabilizing diode is connected with one end of the first resistor;
one end of the second resistor is connected with the other end of the first resistor, and the other end of the second resistor is grounded.
Furthermore, the receiving module further comprises a filtering unit, and the filtering unit is connected with the voltage dividing unit and used for filtering the interference signal in the circuit.
Furthermore, the filtering unit includes a capacitor, one end of the capacitor is connected to a common end of the first resistor and the second resistor, and the other end of the capacitor is grounded.
Furthermore, the control module comprises a power supply unit and a control unit, wherein the power supply unit is connected with the control unit and is used for providing a working power supply for the circuit; the control unit is connected with the receiving module and the output module and is used for controlling the output function of the output module.
Further, the control unit includes a first triode, a second triode, a third resistor and a fourth resistor; the base electrode of the first triode is connected with the other end of the first resistor, the emitting electrode of the first triode is grounded, and the collector electrode of the first triode is respectively connected with one end of the third resistor and the base electrode of the second triode;
a collector of the second triode is respectively connected with one end of the fourth resistor and the output module, and an emitter of the second triode is grounded;
the other end of the third resistor is connected with the power supply unit, and the other end of the fourth resistor is connected with the power supply unit.
In order to solve the above technical problem, an embodiment of the present application further provides an audio playing system, which adopts the following technical solutions:
the audio playing system comprises a processing device and a playing device, wherein the processing device is electrically connected with the playing device;
the processing device comprises a power amplifier circuit and the AUX input circuit, wherein the power amplifier circuit is connected with an output module in the AUX input circuit;
the playing device is connected with the power amplifier circuit and used for playing the audio signal.
Compared with the prior art, the embodiment of the application mainly has the following beneficial effects:
the present application provides an AUX input circuit, comprising: the interface module is connected with the receiving module and transmits peripheral signals to the receiving module, and the peripheral signals comprise power signals and audio signals; the receiving module is used for receiving peripheral signals; the control module is connected with the receiving module and used for closing the output function of the output module when the power supply signal is abnormal; the output module is connected with the control module and used for transmitting the audio signal to the power amplifier circuit when the power supply signal is normal; according to the method and the device, the output function of the output module is controlled to be closed through the control module when the power supply signal received by the receiving module is abnormal, and the output function of the output module is closed, so that the audio signal cannot be transmitted to the rear-end circuit through the output module, and noise is avoided; in addition, noise is eliminated directly through circuit design, and manufacturing cost can be reduced.
Drawings
In order to illustrate the solution of the present application more clearly, the drawings that are needed in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and that other drawings can be obtained by those skilled in the art without inventive effort.
Fig. 1 is a schematic structural diagram of an AUX input circuit according to an embodiment of the present disclosure.
Detailed Description
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the description and claims of this application or in the above-described drawings are used for distinguishing between different objects and not for describing a particular order.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
An AUX input circuit is provided in an embodiment of the present application, and as shown in fig. 1, the AUX input circuit includes an interface module 1, a receiving module 2, a control module 3, and an output module 4; the interface module 1 is connected with the receiving module 2 and transmits peripheral signals to the receiving module 2, wherein the peripheral signals comprise power signals and audio signals; the receiving module 2 is used for receiving peripheral signals; the control module 3 is connected with the receiving module 2 and used for closing the output function of the output module 4 when the power supply signal is abnormal; the output module 4 is connected with the control module 3 and is used for transmitting the audio signal to the power amplifier circuit when the power supply signal is normal.
In some optional implementation manners in this embodiment, the interface module 1 is provided with a power supply voltage branch and a sound channel branch, the power supply voltage branch and the sound channel branch are electrically connected to the receiving module 2, the power supply voltage branch is used for transmitting a power supply signal, and the sound channel branch is used for transmitting the audio signal.
It should be noted that the sound channel branches include a left sound channel branch and a right sound channel branch, and in addition, the interface module 1 is further provided with a ground branch, and the ground branch is grounded.
Specifically, the interface module is an interface J101 shown in fig. 1, the interface J101 is a 4pin signal line, the power supply voltage branch, the left channel branch, the right channel branch and the ground branch form a 4pin signal line, the power supply voltage branch is used for transmitting a peripheral power supply signal, the left channel branch and the right channel branch respectively transmit a peripheral left channel audio signal and a peripheral right channel audio signal, and the ground branch is connected to the reference ground.
Referring to fig. 1, the power supply voltage branch is a lead 4, the right channel branch is a lead 5 and a lead 6, the left channel branch is a lead 3 and a lead 2, and the ground branch is a lead 1.
In a specific implementation manner of this embodiment, the left channel branch and the right channel branch are respectively provided with two leads for audio signal transmission, which can improve the stability of signal transmission.
The interface module 1 is an interface of the playing device and may be called an internal interface, and the internal interface is to be connected with an external interface to transmit an external signal to the playing device. The peripheral devices include, but are not limited to, a mobile phone, a tablet computer, a notebook computer, an MP3 device, etc., and can be connected to the playing device through a connecting wire.
In this embodiment, the external interface is an interface on the connecting line, which is in direct contact connection with the internal interface, and corresponds to the setting of the internal interface, the external interface is also a 4pin signal line, the power supply voltage branch, the left channel branch, the right channel branch and the grounding branch form a 4pin signal line, and the power supply voltage branch is used for transmitting the external power supply signal to the input circuit; the left sound channel branch and the right sound channel branch respectively transmit the peripheral left and right sound channel audio signals to the playing equipment to realize the playing function; the grounding branch is connected with the reference ground.
The receiving module 2 comprises a voltage dividing unit which is connected with the interface module 1 and the control module 3.
Specifically, the voltage dividing unit includes a zener diode D100, a first resistor R100, and a second resistor R101, a cathode of the zener diode D100 is connected to the interface module 1, and an anode of the zener diode D100 is connected to one end of the first resistor R100; one end of the second resistor R101 is connected to the other end of the first resistor R100, and the other end of the second resistor R101 is grounded.
It should be noted that the role of the zener diode is to keep the voltage stable, and when the power voltage fluctuates or the voltage at each point in the circuit fluctuates due to other reasons, the zener diode can keep the voltage across the load substantially unchanged, so as to protect the electronic components in the circuit from being broken down by high current.
As a specific implementation manner, the terminal 1 of the zener diode D100 is an anode, the terminal 2 is a cathode, the cathode of the zener diode D100 is connected to a power supply voltage branch of the interface J101, the anode of the zener diode D100 is sequentially connected in series to the first resistor R100 and the second resistor R101, one end of the R101 is grounded, a peripheral power supply signal is transmitted to the AUX input circuit, and voltage division is performed through the zener diode D100, the first resistor R100, and the second resistor R101.
The receiving module 2 further comprises a filtering unit, and the filtering unit is connected with the voltage dividing unit. The filtering unit is used for filtering interference signals in the circuit, preventing signal interference and ensuring the working stability of the circuit.
In this embodiment, the filtering unit includes a capacitor C383 connected in parallel with the second resistor R101. Specifically, one end of the capacitor C383 is connected to a common end of the first resistor R100 and the second resistor R101, and the other end of the capacitor C383 is grounded.
The control module 3 comprises a control module which comprises a power supply unit and a control unit, and the power supply unit is connected with the control unit. The power supply unit is used for providing working voltage for the circuit, and the control unit is connected with the receiving module 1 and the output module 4 and is used for controlling the output function of the output module 4, specifically, when the power supply signal is normal, the output module 4 is turned on, and when the power supply signal is abnormal, the output module 4 is turned off.
It should be noted that the power supply unit may be disposed inside the circuit, or may be externally supplied with power.
The power supply signal is normally transmitted stably by the signal voltage of the peripheral input signal, and the signal voltage reaches the breakover voltage of the circuit; the power supply signal abnormity is that when the peripheral is suddenly shut down, powered off, the connecting wire is pulled out and the like, the signal voltage is rapidly attenuated and is attenuated to be below the conducting voltage of the circuit.
In this embodiment, the control unit includes a first triode Q100, a second triode Q101, a third resistor R102 and a fourth resistor R103, a base of the first triode Q100 is connected with the other end of the first resistor, an emitter of the first triode Q100 is grounded, and a collector of the first triode Q100 is connected with one end of the third resistor R102 and a base of the second triode Q101 respectively; a collector of the second triode Q101 is respectively connected with one end of the fourth resistor R103 and the output module 4, and an emitter of the second triode Q101 is grounded; the other end of the third resistor R102 is connected to the power supply unit, and the other end of the fourth resistor R103 is connected to the power supply unit.
It should be noted that the power signal transmitted by the power voltage branch is used for determining to control the on or off of the output function of the output module, and the power supply unit provides the power voltage for the circuit to work.
It should be understood that the resistance values of the first resistor, the second resistor, the third resistor and the fourth resistor can be set according to actual conditions.
Referring to fig. 1, the power supply unit is VCC, for example, the power supply voltage is 3.3V; the OUTPUT module 4 is SIGNAL _ OUTPUT.
As a specific example, the first triode Q100 has an emitter E at the terminal 1, a base B at the terminal 2, and a collector C at the terminal 3; the second triode Q101 has an emitter E at the terminal 1, a base B at the terminal 2, and a collector C at the terminal 3. The first transistor Q100 and the second transistor Q101 are both NPN transistors, and there are two current flows in the NPN transistors, one is a base current flowing from the base B to the emitter E, and the other is a collector current flowing from the collector C to the emitter E.
The triode has three working states which are respectively saturatedThe triode is in a saturated conduction state when the voltage of the BE pole is greater than a certain voltage value; when the voltage of the BE pole is less than or equal to a certain voltage value, the triode is in a cut-off state. When the emitting junction BE of the triode is forward biased and the collecting junction BC is reversely biased, the triode enters an amplifying state, a certain voltage drop exists between the collecting electrode C and the emitting electrode B in the amplifying state, and the voltage drop U is formedCEHow large is determined by the specific circuit.
In a specific implementation mode, when the voltage of the BE pole is greater than 0.7V, the triode is in a saturated conduction state; when the voltage of the BE pole is less than or equal to 0.7V, the triode is in a cut-off state.
The BE pole of the first triode Q100 is connected with the second resistor R101 in parallel, and the voltage of the BE pole is equal to the voltage of the R101. When the electronic device normally works, a peripheral power supply signal is transmitted to the playing device, the power supply signal is 24V, after the playing device receives the power supply signal, voltage division is performed through the voltage stabilizing diode D100, the first resistor R100 and the second resistor R101, the BE voltage of the first triode Q100 is larger than 0.7V, the first triode Q100 is in a saturated conduction state, the CE electrodes are in a linear connection state, the voltage of the emitting electrode E and the collector electrode C of the Q100 is 0, the voltage of the base electrode B of the second triode Q101 is also 0, the voltage of the BE electrode is smaller than or equal to 0.7V, and the Q101 is in a cut-off state.
When second triode Q101 is in the off-state, the impedance is infinite between the CE poles, be in the off-state, power supply unit's supply voltage passes through fourth resistance R103 output high level, output module 4 is connected to the enable port of playback devices power amplifier, after the enable port detects the high level, control output module 4's output function and open, give rear end power amplifier circuit with audio signal transmission, and give play device through power amplifier circuit transmission, for example loudspeaker, accomplish normal audio playback function.
When the peripheral equipment is suddenly shut down, powered off, the signal wire is pulled out and the like, a noise signal is generated and transmitted to the playing equipment through the AUX wire. Meanwhile, the voltage value of the power signal of the peripheral device is rapidly attenuated due to the operations of shutdown, power failure, signal line extraction and the like of the peripheral device. The zener diode needs to reach a certain voltage value to be conducted, when the voltage value of the power signal is attenuated to be below the certain voltage value, the power signal cannot be subjected to voltage division through the zener diode D100, the first resistor R100 and the second resistor R101, so that the first triode Q100 is in a cut-off state, specifically, the conducting voltage of the zener diode is 20V, and when the voltage value of the power signal is attenuated to be below 20V, the voltage division cannot be performed through the zener diode D100, the first resistor R100 and the second resistor R101.
When the first triode Q100 is in a cut-off state, the power supply voltage of the power supply unit is divided by the third resistor R102 and then transmitted to the second triode Q101, the second triode Q101 is in a saturation conduction state, the CE electrodes are in a linear connection state, the voltage of the emitter E and the collector C of the Q101 is 0, the output module 4 outputs a low level because of the saturation conduction of the Q101, when the enable port detects the low level, the output function of the output module 4 is controlled to be closed, the audio signal cannot be transmitted to the rear-end power amplifier circuit, and therefore the noise elimination function is achieved.
This application controls output module's output function through control module according to the power signal that receiving module received, and control output function's opening or closing when power signal is unusual, closes output module's output function for audio signal can not transmit for the rear end circuit through output module, thereby avoids the production of noise, and simultaneously, directly comes the noise abatement through circuit design, can reduce manufacturing cost.
The application also provides an audio playing system, which comprises a processing device and a playing device, wherein the processing device is electrically connected with the playing device, the processing device is also provided with a power amplifier circuit and the AUX input circuit of the embodiment, and the power amplifier circuit is connected with an output module 4 of the AUX input circuit; the playing device is connected with the power amplifier circuit and is used for playing the audio signal.
It is to be understood that the above-described embodiments are merely illustrative of some, but not restrictive, of the broad invention, and that the appended drawings illustrate preferred embodiments of the invention and do not limit the scope of the invention. This application is capable of embodiments in many different forms and is provided for the purpose of enabling a thorough understanding of the disclosure of the application. Although the present application has been described in detail with reference to the foregoing embodiments, it will be apparent to one skilled in the art that the present application may be practiced without modification or with equivalents of some of the features described in the foregoing embodiments. All equivalent structures made by using the contents of the specification and the drawings of the present application are directly or indirectly applied to other related technical fields and are within the protection scope of the present application.
Claims (10)
1. An AUX input circuit, comprising:
the device comprises an interface module, a receiving module, a control module and an output module;
the interface module is connected with the receiving module and transmits peripheral signals to the receiving module, wherein the peripheral signals comprise power signals and audio signals;
the receiving module is used for receiving the peripheral signals;
the control module is connected with the receiving module and used for closing the output function of the output module when the power supply signal is abnormal;
the output module is connected with the control module and used for transmitting the audio signal to the power amplifier circuit when the power supply signal is normal.
2. The AUX input circuit of claim 1, wherein the interface module is provided with a power supply voltage branch and a sound channel branch, the power supply voltage branch and the sound channel branch are electrically connected to the receiving module, the power supply voltage branch is used for transmitting the power supply signal, and the sound channel branch is used for transmitting the audio signal.
3. The AUX input circuit of claim 2, wherein the interface module further comprises a ground branch, the ground branch being grounded.
4. The AUX input circuit of claim 1, wherein the receiving module comprises a voltage divider unit, and the voltage divider unit is connected to the interface module and the control module.
5. The AUX input circuit of claim 4, wherein the voltage divider unit comprises a zener diode, a first resistor, and a second resistor; the negative electrode of the voltage stabilizing diode is connected with the interface module, and the positive electrode of the voltage stabilizing diode is connected with one end of the first resistor;
one end of the second resistor is connected with the other end of the first resistor, and the other end of the second resistor is grounded.
6. The AUX input circuit of claim 5, wherein the receiving module further comprises a filtering unit, and the filtering unit is connected to the voltage dividing unit and configured to filter an interference signal in the circuit.
7. The AUX input circuit of claim 6, wherein the filtering unit comprises a capacitor, one end of the capacitor is connected to a common terminal of the first resistor and the second resistor, and the other end of the capacitor is grounded.
8. The AUX input circuit of any one of claims 5-7, wherein the control module comprises a power supply unit and a control unit, the power supply unit being connected to the control unit for providing operating power to the circuit; the control unit is connected with the receiving module and the output module and is used for controlling the output function of the output module.
9. The AUX input circuit of claim 8, wherein the control unit comprises a first transistor, a second transistor, a third resistor, and a fourth resistor; the base electrode of the first triode is connected with the other end of the first resistor, the emitting electrode of the first triode is grounded, and the collector electrode of the first triode is respectively connected with one end of the third resistor and the base electrode of the second triode;
a collector of the second triode is respectively connected with one end of the fourth resistor and the output module, and an emitter of the second triode is grounded;
the other end of the third resistor is connected with the power supply unit, and the other end of the fourth resistor is connected with the power supply unit.
10. The utility model provides an audio playing system, includes processing apparatus and play device, and the electricity is connected between processing apparatus and the play device which characterized in that:
the processing device comprises a power amplifier circuit and the AUX input circuit according to any one of claims 1 to 9, wherein the power amplifier circuit is connected with an output module in the AUX input circuit;
the playing device is connected with the power amplifier circuit and used for playing the audio signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120102069.0U CN215072952U (en) | 2021-01-14 | 2021-01-14 | AUX input circuit and audio playing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120102069.0U CN215072952U (en) | 2021-01-14 | 2021-01-14 | AUX input circuit and audio playing system |
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| CN215072952U true CN215072952U (en) | 2021-12-07 |
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| CN202120102069.0U Active CN215072952U (en) | 2021-01-14 | 2021-01-14 | AUX input circuit and audio playing system |
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Effective date of registration: 20220309 Address after: 518000 area 101A, 401, No. 15, Zhongfu Road, tangxiayong community, Yanluo street, Bao'an District, Shenzhen City, Guangdong Province Patentee after: SHENZHEN 3NOD DIGITAL TECHNOLOGY Co.,Ltd. Patentee after: Pingxiang sannuo Digital Technology Co., Ltd Address before: 518000 area 101A, 401, No. 15, Zhongfu Road, tangxiayong community, Yanluo street, Bao'an District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN 3NOD DIGITAL TECHNOLOGY Co.,Ltd. |