CN112969128A - Low-distortion audio system - Google Patents
Low-distortion audio system Download PDFInfo
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- CN112969128A CN112969128A CN202110246752.6A CN202110246752A CN112969128A CN 112969128 A CN112969128 A CN 112969128A CN 202110246752 A CN202110246752 A CN 202110246752A CN 112969128 A CN112969128 A CN 112969128A
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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
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00304—Overcurrent protection
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Abstract
The embodiment of the application belongs to the field of audio electronic products, and relates to a low-distortion audio system which comprises a power management circuit, an audio input circuit, a processing circuit, a power amplifier circuit and an audio output circuit, wherein the power management circuit comprises a charging management circuit module and a charging module, the charging management circuit module is connected with the charging module and the processing circuit and used for charging the charging module, and the charging module is connected with the power amplifier circuit and used for supplying power to the power amplifier circuit; the audio input circuit is connected with the processing circuit and used for receiving audio signals; the processing circuit is used for determining the required voltage output by the power amplification circuit according to the audio signal and transmitting the audio signal to the power amplification circuit; the power amplifier circuit is used for adjusting voltage according to the required voltage and transmitting the audio signal to the audio output circuit after power amplification; the audio output circuit outputs the audio signal. The technical scheme that this application provided can guarantee that the required voltage of power amplifier circuit matches with audio signal, avoids audio distortion.
Description
Technical Field
The present application relates to the field of audio electronic products, and more particularly, to a low distortion audio system.
Background
With the rapid development of the internet technology, the popularization of technologies such as cloud music and cloud voice service enables the types of sound sources to become complex and diversified, such as the audio frequency of terminal products such as internet music, smart phones, smart homes, tablet computers, internet of vehicles and intelligent wearing, and the like.
Referring to fig. 1, a conventional intelligent audio device circuit generally comprises a power input interface 1, a charging management module 2, a rechargeable battery 3, a DC power management module 4, a boost circuit module 5, a large-capacity filter capacitor 6, a power amplifier 7, a speaker 8, an audio input 9, and a CPU subsystem 10, and has a working principle: the power input interface 1 supplies external power to the charging management module 2, the charging management module 2 is divided into two paths of power supplies, one path of power supply is reduced to proper voltage (usually adjustable from 3.9V to 4.5V) and is supplied to the DC power management module 4, each path of power supply required by the CPU small system is output, the other path of power supply is directly connected with an output power supply through a field effect tube arranged in the charging management circuit module 2, after the power supply is input into the boosting circuit module 5, the boosting processing is carried out to output fixed constant voltage, voltage required by the power amplifier 7 is provided to drive the power amplifier to work, the signal is amplified and then is output to the loudspeaker 8, conversion between electric signals and sound energy is.
In the prior art, the current flowing through the charge management module 2 is the sum of the current output to the power amplifier 7 and the current output to the CPU subsystem 10. The power amplifier 7 is a high-energy-consumption device, the current is usually large in the instant, even more than 10A, and since the internal resistance of the field-effect tube in the charge management module 2 cannot reach 0 ohm in an ideal state, the power consumption of the field-effect tube increases along with the increase of the current, which easily causes overheating or overcurrent damage of the device. Meanwhile, since the audio signal is dynamically changed and the constant voltage is provided by the conventional booster circuit module 5, when a large dynamic audio signal is played back, the power amplifier 7 cannot output a corresponding large dynamic signal, which results in an increase in distortion.
Disclosure of Invention
The technical problem to be solved by the embodiment of the application is that the audio equipment and the audio signal can not be well matched, so that the audio distortion is caused.
In order to solve the above technical problem, an embodiment of the present application provides a low distortion audio system, which adopts the following technical solutions:
the method comprises the following steps: the device comprises a power management circuit, an audio input circuit, a processing circuit, a power amplifier circuit and an audio output circuit;
the power management circuit is respectively connected with the processing circuit and the power amplifier circuit, is used for providing a working power supply for the audio system, and comprises a charging management circuit module and a charging module, wherein the charging management circuit module is connected with the charging module and the processing circuit, and is used for charging the charging module, reducing the voltage of the received power supply and transmitting the reduced voltage to the processing circuit; the charging module is connected with the power amplifier circuit and used for supplying power to the power amplifier circuit;
the audio input circuit is used for receiving an audio signal;
the processing circuit is connected between the audio input circuit and the power amplifier circuit and used for determining the required voltage output by the power amplifier circuit according to the audio signal and transmitting the audio signal to the power amplifier circuit;
the power amplifier circuit is used for adjusting output voltage according to the required voltage, amplifying the power of the audio signal and transmitting the audio signal to the audio output circuit;
the audio output circuit is connected with the power amplifier circuit and used for outputting the audio signal.
Furthermore, the power amplifier circuit comprises a programmable boost module and a power amplification module;
the programmable boost module is respectively connected with the charging module and the power amplification module and is used for adjusting output voltage according to the required voltage;
the power amplification module is connected with the processing circuit and used for receiving the audio signal and performing power amplification on the audio signal.
Furthermore, the power amplifier circuit further comprises an electronic switch module, and the electronic switch module is connected between the programmable boost module and the charging module and is used for switching on or off the power amplifier circuit.
Further, the electronic switch module is specifically a field effect transistor.
Furthermore, the processing circuit comprises a dynamic signal acquisition module and a CPU small system;
the dynamic signal acquisition module is respectively connected with the audio input circuit and the CPU small system and is used for acquiring audio signals, processing the audio signals and transmitting the processed audio signals to the CPU small system;
the CPU small system is connected with the audio input circuit and the power amplification module, is connected with the programmable boost module, and is used for transmitting the audio signal to the power amplification module, determining the required voltage of the power amplification module according to the processed audio signal, and controlling the programmable boost module to adjust the output voltage of the power amplification circuit according to the required voltage;
the CPU small system is also connected with the electronic switch module and used for controlling the electronic switch module to be switched on or switched off according to the audio signal.
Furthermore, the power management circuit further comprises a direct current power management module, which is used for connecting the charging management circuit module and the CPU subsystem, receiving the power output by the charging management circuit module, and supplying power to the CPU subsystem.
Furthermore, the power amplifier circuit further comprises an adjustable capacitor filtering module, which is connected between the programmable boosting module and the power amplifying module, and is used for adjusting a capacitance value, discharging and supplying power to the power amplifying module.
Further, the audio output circuit is specifically a speaker, and the speaker is connected with the power amplifier circuit and is used for outputting the amplified audio signal.
Furthermore, the power management circuit further comprises a power input interface, connected to the charging management circuit module, and configured to be connected to an external power supply, so as to provide a working power supply for the audio system.
Furthermore, a switch unit is arranged in the charging management circuit module, and the switch unit is connected with the processing circuit and used for transmitting the received power to the processing circuit after the received power is reduced in voltage.
Compared with the prior art, the embodiment of the application mainly has the following beneficial effects:
according to the power management circuit, the charging management circuit module of the power management circuit divides the working power supply into two paths which are respectively connected with the charging module and the processing circuit, one path is used for charging the charging module and supplying power to the power amplification circuit, the other path is used for reducing the voltage of the received power supply and then transmitting the reduced voltage to the processing circuit, so that the phenomenon that the power amplification circuit increases the load of the charging management circuit module due to overlarge instantaneous current can be avoided, and the charging management circuit module is prevented from being damaged due to overload; meanwhile, the processing circuit can determine the required voltage output by the power amplifier circuit according to the audio signal, so that the power amplifier circuit dynamically adjusts the voltage according to the required voltage, the required voltage of the power amplifier circuit can be ensured to be matched with the audio signal, and audio distortion is avoided.
Drawings
In order to illustrate the present application or prior art more clearly, a brief description of the drawings needed for the description of the embodiments or prior art will be given below, it being clear that the drawings in the following description are some embodiments of the present application and that other drawings can be derived from them by a person skilled in the art without inventive effort.
FIG. 1 is a schematic diagram of a prior art audio device;
fig. 2 is a schematic structural diagram of an audio system according to an embodiment of the present application.
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.
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.
The embodiment of the present application provides a low distortion audio system, which is shown in fig. 2 and includes a power management circuit 1, an audio input circuit 2, a processing circuit 3, a power amplifier circuit 4, and an audio output circuit 5; the power management circuit 1 is respectively connected with the processing circuit 3 and the power amplifier circuit 4, is used for providing a working power supply for the audio system, and comprises a charging management circuit module 11 and a charging module 12, wherein the charging management circuit module 11 is respectively connected with the charging module 12 and the processing circuit 3, is used for charging the charging module 12, and transmits the received power supply voltage to the processing circuit 3 after reducing the voltage, and the charging module 12 is connected with the power amplifier circuit 4 and is used for supplying power to the power amplifier circuit 4; the audio input circuit 2 is used for receiving an audio signal; the processing circuit 3 is connected between the audio input circuit 2 and the power amplifier circuit 4, and is used for determining the required voltage output by the power amplifier circuit 4 according to the audio signal and transmitting the audio signal to the power amplifier circuit 4; the power amplifier circuit 4 is used for adjusting output voltage according to the required voltage, amplifying the power of the audio signal and transmitting the audio signal to the audio output circuit 5; the audio output circuit 5 is connected with the power amplifier circuit 4 and is used for outputting audio signals.
In this embodiment, the power management circuit 1 further includes a power input interface 13, and the power input interface 13 is connected to an external power supply to provide a working power supply for the audio system.
Specifically, the power input interface 13 provides external power to the charging management circuit module 11, and divides two power sources, one of which is a charging branch and the other is a processing branch, and the charging management circuit module 11 steps down the power source and charges the charging module 12 through the charging branch, and simultaneously steps down the power source to a suitable voltage (usually 3.9V to 4.5V is adjustable) to provide the power source for the processing circuit 3.
It is understood that the charging module 12 is embodied as a rechargeable battery, and the charging management circuit module 11 needs to control the charging current when charging the rechargeable battery, when the external power supply is available, the charging management circuit module 11 detects that the rechargeable battery needs to be charged, and when the charging is started, the charging management circuit module 11 reduces the voltage to provide trickle for the rechargeable battery for pre-charging, and probes whether the rechargeable battery is normal or not, after a period of time, if the voltage of the rechargeable battery exceeds a preset value, the state of the rechargeable battery is considered to be normal, the next stage of charging can be carried out, the current is increased to carry out constant current charging, the constant current charging is carried out until the electric quantity of the rechargeable battery is preset, for example, 80%, then trickle charging is carried out until the rechargeable battery is fully charged, in this process, the charging management circuit module 11 may control the charging current according to the condition of the rechargeable battery.
It should be noted that, when the charging module 12 has enough power to supply power to the power amplifier circuit, it is not necessary to charge the power amplifier circuit; when the charging module 12 does not have enough power supply to supply power to the power amplifier circuit, the charging management circuit module 11 charges the power amplifier circuit through the transmission power supply of the charging branch circuit; the audio system is provided with operating power by the charging module 12 in the absence of external power.
In this embodiment, a low-power charging module 12 may provide a power supply for the audio system, so as to achieve the effects of energy saving, emission reduction, and low cost.
In this embodiment, referring to fig. 2, the power amplifier circuit 4 includes a programmable boost module 41 and a power amplification module 42, where the programmable boost module 41 is connected to the charging module 12 and the power amplification module 42, respectively, and may be configured to adjust an output voltage of the programmable boost module 41 according to a voltage required by the power amplifier circuit 4; the power amplification module 42 is connected to the processing circuit 3, and is configured to receive the audio signal and perform power amplification on the audio signal.
In this embodiment, the required voltage of the power amplifier circuit 4 is specifically a voltage required by the power amplifier module 42 to perform power amplification on the audio signal power.
In this embodiment, the power amplifier circuit 4 further includes an electronic switch module 43, and the electronic switch module 43 is connected between the programmable boost module 41 and the charging module 12, and is configured to turn on or off the power amplifier circuit 4.
The electronic switch module 43 is specifically a field effect transistor, and the charging module 12 outputs power to the programmable boost module 41 through the electronic switch module 43, and provides required power for the power amplification module 42 after being boosted by the programmable boost module 41.
In the present embodiment, the power amplifying module 42 is specifically a power amplifier, which can generate the maximum power output to drive a certain load amplifier under the condition of a given distortion rate.
In this embodiment, the power amplification module 42 provides the required working current from the charging module 12, and the working current does not flow through the charging management circuit module 11, compared with the conventional technology, the power amplification module 42 generates a larger instantaneous current and does not flow through the charging management circuit module 11, so as to prevent the charging management circuit module 11 from being damaged due to overload.
In this embodiment, the processing circuit 3 includes a dynamic signal acquisition module 31 and a CPU (central processing unit) subsystem 32, where the dynamic signal acquisition module 31 is connected to the audio input circuit and the CPU subsystem 32 respectively, and is configured to acquire an audio signal, perform signal processing on the audio signal, and transmit the processed audio signal to the CPU subsystem 32.
It should be noted that the dynamic signal acquisition module 31 acquires an input audio signal, amplifies, rectifies, and performs analog-to-digital conversion on the audio signal, and then outputs the audio signal to the CPU subsystem 32 for analysis. The dynamic signal acquisition module 31 can acquire dynamically changing audio signals to the CPU subsystem 32 in real time.
In a specific implementation manner, the dynamic signal acquisition module 31 is directly connected to the programmable boost module 41, the audio signal acquired by the dynamic signal acquisition module 31 may not be processed by the CPU subsystem 32, and is directly transmitted to the programmable boost module 41, and after being filtered by the filtering unit inside the programmable boost module 41, the programmable boost module 41 is directly controlled to adjust the output voltage of the power amplifier circuit according to the magnitude of the audio signal, so that the voltage adjustment efficiency can be improved.
The CPU subsystem 32 is connected to the audio input circuit 2 and the power amplification module 42, and is also connected to the programmable boost module 41, and is configured to transmit the audio signal to the power amplification module 42, and the power amplification module 42 performs power amplification on the audio signal; the CPU subsystem 32 is further configured to determine a required voltage of the power amplification module 42 according to the processed audio signal, and control the programmable boost module 41 to adjust an output voltage of the power amplifier circuit according to the required voltage.
The CPU subsystem 32 may set a corresponding software algorithm, perform signal processing on the audio signal acquired and input in real time by the dynamic signal acquisition module 31 according to the acquired audio signal, and send the processed audio signal to the CPU subsystem 32, and the CPU subsystem 32 calculates the magnitude of the output voltage required by the power amplification module 42 according to the data of the audio signal, such as signal frequency, peak value, phase, and the like, by the corresponding software algorithm, and controls the programmable voltage boosting module 41 to perform dynamic voltage boosting and reducing accordingly, so that the voltage of the power amplification module matches the audio signal, and distortion of the output audio is avoided.
It should be noted that the CPU small system 32 and the programmable boost module 41 may be connected through any one of a GPIO or an I2C bus or a Uart (Universal Asynchronous Receiver/Transmitter), and then the CPU small system 32 controls the programmable boost module 41 to dynamically boost and buck according to the magnitude of the audio signal through the GPIO or the I2C bus or the Uart, so as to ensure that the output audio is not distorted.
The CPU subsystem 32 is also connected to the electronic switch module 43 for controlling the electronic switch module 43 to be turned on or off.
It should be noted that the CPU subsystem may be connected to the electronic switch module 43 through any of GPIO or I2C bus or Uart.
In the present embodiment, the audio input circuit 2 comprises an audio input module 21 for receiving an audio signal. The audio input module 21 is divided into two branches, one branch is directly connected with the CPU subsystem 32, and the other branch is connected with the CPU subsystem 32 through the dynamic signal acquisition module 31. Specifically, the CPU subsystem 32 is connected to the electronic switch module 43 through a GPIO (General-purpose input/output), the CPU subsystem 32 receives the audio signal input by the audio input module 21, the CPU subsystem 32 controls the electronic switch module 43 to be turned on, and correspondingly, the power amplifier circuit 4 is turned on; the CPU subsystem 32 does not receive the audio signal input by the audio input module 21, and controls the electronic switch module 43 to close, and correspondingly, the power amplifier circuit 4 is disconnected.
It can be understood that the CPU subsystem 32 controls the on/off of the power amplifier circuit 4 through the audio signal received from the audio input module 21, and calculates the voltage value required by the power amplifier circuit 4 by receiving the audio signal that is input and signal-processed in real time by the dynamic signal acquisition module 31, thereby controlling the voltage of the power amplifier circuit 4.
The power management circuit 1 further includes a dc power management module 14, which is respectively connected to the CPU subsystem 32 and the charging management circuit module 11, and is configured to receive the power output by the charging management circuit module 11 and supply power to the CPU subsystem 32.
It should be noted that the CPU subsystem 32 is a large-scale integrated circuit, and can execute different instruction tasks, and the voltages required by the circuits corresponding to the different instruction tasks may be different, and the voltage may be divided and output to the corresponding circuits through the dc power management module 14.
Specifically, the power input interface 13 provides external power to the charging management circuit module 11, the charging management circuit module 11 divides the power into two paths, which are a charging branch and a processing branch, respectively, and the voltage of the power distributed to the processing branch is reduced to a suitable voltage, which is usually adjustable from 3.9V to 4.5V, and then the voltage is transmitted to the dc power management module 14, and the power required by the CPU subsystem 32 is output through the dc power management module 14.
In some optional implementation manners of this embodiment, the power amplifier circuit 4 further includes an adjustable capacitor filtering module 44, connected between the programmable boost module 41 and the power amplification module 42, for adjusting a capacitance value, performing discharging, and supplying power to the power amplification module 42.
After the programmable boost module 41 boosts the audio signal, the voltage required by the power amplification module 42 still cannot be reached, at this time, the capacitance value can be adjusted by the adjustable capacitance filtering module 44, and the adjustable capacitance filtering module 44 discharges the power to supply power to the power amplification module 42, so that the power supply supplied to the power amplification module 42 can be matched with the output of the power amplification module 42 after the audio signal power amplification, and the problem of insufficient transient current of a rechargeable battery during large dynamic output can be solved; meanwhile, since the current flowing through the power amplification module 42 does not pass through the charging management circuit module 11, it is avoided that the charging management circuit module 11 is damaged due to the fact that the capacitance of the tunable capacitance filtering module 44 is too large and the charging current is too large instantaneously.
The programmable boost module 41 adjusts the voltage and outputs the adjusted voltage to the power amplification module 42, and the circuit has transient overshoot voltage at the moment of starting the power amplification module 42, and can be filtered by the adjustable capacitor filtering module 44.
In this embodiment, a switch unit is disposed inside the charging management circuit module 11, and the switch unit is connected to the processing circuit 3 and is configured to step down the received power and transmit the power to the processing circuit 3.
In this embodiment, the switching unit is specifically a field effect transistor, and the charging management circuit module 11 is divided into two power supplies, wherein the processing branch is transmitted to the processing circuit 3 through the field effect transistor, and the other charging branch is transmitted to the charging module 12 without passing through the field effect transistor, so as to charge the charging module 12.
The charging management circuit module 11 divides the power into two paths, one path is output to the dc power management module 14 through the fet, and the other path does not pass through the fet. Therefore, the field effect transistor can be prevented from being damaged due to the fact that instantaneous charging current is too large.
In this embodiment, the audio output circuit 5 is specifically a speaker 51, and the speaker 51 is connected to the power amplifier circuit 4 and is configured to output the amplified audio signal. The speaker is a transducer for converting an electric signal into an acoustic signal, and specifically, the speaker 51 is connected to the power amplification module 42 and outputs an audio signal which is power-amplified by the power amplification module 42.
The application provides a low-distortion audio system, which comprises a power supply management circuit, an audio input circuit, a processing circuit, a power amplifier circuit and an audio output circuit, wherein the power supply management circuit is respectively connected with the processing circuit and the power amplifier circuit and is used for providing working power supply for the audio system; the charging module is connected with the power amplifier circuit and used for supplying power to the power amplifier circuit; the audio input circuit is used for receiving an audio signal; the processing circuit is connected between the audio input circuit and the power amplifier circuit and used for determining the required voltage output by the power amplifier circuit according to the audio signal and transmitting the audio signal to the power amplifier circuit; the power amplifier circuit is used for adjusting output voltage according to the required voltage and transmitting the audio signal to the audio output circuit after power amplification; the audio output circuit is connected with the power amplifier circuit and outputs audio signals. This application can avoid power amplifier circuit to increase the load of the management circuit module that charges because of the electric current is too big in the twinkling of an eye, ensures that the management circuit module that charges can not damage because of transshipping, and simultaneously, processing circuit can confirm the required voltage of power amplifier circuit output according to audio signal for power amplifier circuit is according to required voltage dynamic adjustment voltage, can guarantee that power amplifier circuit required voltage and audio signal match, avoids the audio distortion.
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. A low distortion audio system, comprising:
the device comprises a power management circuit, an audio input circuit, a processing circuit, a power amplifier circuit and an audio output circuit;
the power management circuit is respectively connected with the processing circuit and the power amplifier circuit, is used for providing a working power supply for the audio system, and comprises a charging management circuit module and a charging module, wherein the charging management circuit module is connected with the charging module and the processing circuit, and is used for charging the charging module, reducing the voltage of the received power supply and transmitting the reduced voltage to the processing circuit; the charging module is connected with the power amplifier circuit and used for supplying power to the power amplifier circuit;
the audio input circuit is used for receiving an audio signal;
the processing circuit is connected between the audio input circuit and the power amplifier circuit and used for determining the required voltage output by the power amplifier circuit according to the audio signal and transmitting the audio signal to the power amplifier circuit;
the power amplifier circuit is used for adjusting output voltage according to the required voltage, amplifying the power of the audio signal and transmitting the audio signal to the audio output circuit;
the audio output circuit is connected with the power amplifier circuit and used for outputting the audio signal.
2. The low distortion audio system of claim 1 wherein the power amplifier circuit comprises a programmable boost module and a power amplification module;
the programmable boost module is respectively connected with the charging module and the power amplification module and is used for adjusting output voltage according to the required voltage;
the power amplification module is connected with the processing circuit and used for receiving the audio signal and performing power amplification on the audio signal.
3. The audio system with low distortion of claim 2, wherein the power amplifier circuit further comprises an electronic switch module, and the electronic switch module is connected between the programmable boost module and the charging module, and is configured to turn on or off the power amplifier circuit.
4. A low distortion audio system according to claim 3, wherein the electronic switching module is embodied as a field effect transistor.
5. A low distortion audio system according to claim 3, wherein the processing circuit comprises a dynamic signal acquisition module and a CPU subsystem;
the dynamic signal acquisition module is respectively connected with the audio input circuit and the CPU small system and is used for acquiring audio signals, processing the audio signals and transmitting the processed audio signals to the CPU small system;
the CPU small system is connected with the audio input circuit and the power amplification module, is connected with the programmable boost module, and is used for transmitting the audio signal to the power amplification module, determining the required voltage of the power amplification module according to the processed audio signal, and controlling the programmable boost module to adjust the output voltage of the power amplification circuit according to the required voltage;
the CPU small system is also connected with the electronic switch module and used for controlling the electronic switch module to be switched on or switched off according to the audio signal.
6. The audio system with low distortion of claim 5, wherein the power management circuit further comprises a dc power management module, for connecting the charging management circuit module and the CPU subsystem, receiving the power outputted from the charging management circuit module, and supplying power to the CPU subsystem.
7. The audio system of claim 2, wherein the power amplifier circuit further comprises an adjustable capacitor filter module connected between the programmable boost module and the power amplifier module, for adjusting a capacitance value, discharging and supplying power to the power amplifier module.
8. The low-distortion audio system according to any one of claims 1 to 7, wherein the audio output circuit is a speaker, and the speaker is connected to the power amplifier circuit and configured to output the amplified audio signal.
9. The audio system as claimed in any one of claims 1 to 7, wherein the power management circuit further comprises a power input interface, connected to the charging management circuit module, for connecting an external power supply to provide an operating power for the audio system.
10. The audio system according to any one of claims 1 to 7, wherein a switch unit is disposed inside the charging management circuit module, and the switch unit is connected to the processing circuit and configured to step down the received power and transmit the power to the processing circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110246752.6A CN112969128A (en) | 2021-03-05 | 2021-03-05 | Low-distortion audio system |
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| CN202110246752.6A CN112969128A (en) | 2021-03-05 | 2021-03-05 | Low-distortion audio system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113904414A (en) * | 2021-10-28 | 2022-01-07 | 江西创成微电子有限公司 | Charging control method and device and audio processing equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113904414A (en) * | 2021-10-28 | 2022-01-07 | 江西创成微电子有限公司 | Charging control method and device and audio processing equipment |
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