CN116668904A

CN116668904A - Audio circuit and electronic device

Info

Publication number: CN116668904A
Application number: CN202211651130.2A
Authority: CN
Inventors: 王良; 李婷
Original assignee: Honor Device Co Ltd
Current assignee: Honor Device Co Ltd
Priority date: 2022-12-21
Filing date: 2022-12-21
Publication date: 2023-08-29
Anticipated expiration: 2042-12-21
Also published as: CN116668904B

Abstract

The embodiment of the application is applicable to the technical field of audio, and provides an audio circuit and electronic equipment, wherein the audio circuit comprises a power amplifier, a first loudspeaker, a second loudspeaker and a first capacitor, wherein the first loudspeaker and the first capacitor are connected in series to form the first circuit, the first circuit is connected with the second loudspeaker in parallel, the power amplifier is connected with the first circuit and the second loudspeaker, the power amplifier is used for outputting a first signal, the first signal is obtained when the first signal passes through the second loudspeaker, the first capacitor is used for isolating the first signal when the first signal passes through the first capacitor in the first circuit, the power amplifier is used for adjusting the audio signal of the second frequency based on the feedback signal, and the feedback signal is used for indicating the impedance of the second loudspeaker, so that the performance of the second loudspeaker can be presented to be more extreme based on the feedback signal under the condition that the electronic equipment comprises the first loudspeaker and the second loudspeaker, and the tone quality of the electronic equipment is improved.

Description

Audio circuit and electronic device

Technical Field

The present application relates to the field of audio technology, and more particularly, to an audio circuit and an electronic device.

Background

With the development of terminal equipment, people have higher requirements on sound quality of the terminal equipment. In some terminal devices, the audio output unit is divided into a full-frequency speaker and a high-frequency speaker which are connected in parallel, the audio signals of medium frequency and low frequency are output through the full-frequency speaker, and the audio signals of high frequency are output through the high-frequency speaker, so that the tone quality of the terminal device is improved.

An intelligent power amplifier (Smart PA) is usually disposed before the audio output unit, where the Smart PA is configured to output a detection signal to the audio output unit, and adjust, in real time, an audio signal input to the audio output unit according to a feedback signal of the detection signal by the audio output unit, so that the audio output unit can operate in an optimal state. However, when the audio output unit in the terminal device is divided into the full-range speaker and the tweeter connected in parallel, since the full-range speaker and the tweeter have different operating frequency bands, the Smart PA cannot distinguish whether the feedback signal is the feedback signal of the full-range speaker or the feedback signal of the tweeter, and thus cannot adjust the audio signal, resulting in low sound quality of the terminal device.

Based on this, how to adjust the audio signal and improve the sound quality of the terminal device becomes a problem to be solved in the case that the audio output unit includes the full-range speaker and the tweeter connected in parallel.

Disclosure of Invention

The application provides an audio circuit and electronic equipment, which can adjust audio signals and improve the tone quality of terminal equipment under the condition that an audio output unit comprises a full-frequency loudspeaker and a high-frequency loudspeaker which are connected in parallel.

In a first aspect, an audio circuit is provided, the audio circuit includes a power amplifier, a first speaker, a second speaker and a first capacitor, wherein the first speaker and the first capacitor are connected in series to form a first circuit, the first circuit is connected in parallel with the second speaker, and the power amplifier is connected with the first circuit and the second speaker;

the power amplifier is used for outputting a first signal, a feedback signal is obtained when the first signal passes through the second loudspeaker, and the first signal is isolated by the first capacitor when the first signal passes through the first capacitor in the first circuit;

the power amplifier is used for receiving a feedback signal, and the feedback signal returns to the power amplifier along a channel between the second loudspeaker and the power amplifier, wherein the feedback signal is used for indicating the impedance of the second loudspeaker;

the power amplifier is used for outputting an audio signal with a first frequency to the first loudspeaker and outputting an audio signal with a second frequency to the second loudspeaker;

the power amplifier is used for adjusting the audio signal of the second frequency based on the feedback signal so that the output power of the second loudspeaker meets the preset requirement.

The audio circuit provided by the embodiment of the application comprises a power amplifier, a first loudspeaker, a second loudspeaker and a first capacitor, wherein the first loudspeaker and the first capacitor are connected in series to form a first circuit, the first circuit is connected with the second loudspeaker in parallel, the power amplifier is connected with the first circuit and the second loudspeaker, wherein the power amplifier is used for outputting a first signal, the first signal obtains a feedback signal when passing through the second loudspeaker, the first signal is isolated by the first capacitor when passing through the first capacitor in the first circuit, the power amplifier is used for receiving a feedback signal, the feedback signal returns to the power amplifier along a channel between the second loudspeaker and the power amplifier, wherein the feedback signal is used for indicating the impedance of the second loudspeaker, the power amplifier is used for outputting an audio signal with a first frequency to the first loudspeaker, the power amplifier is used for outputting an audio signal with a second frequency to the second loudspeaker, the power amplifier is used for adjusting the audio signal with the second frequency based on the feedback signal, so that the output power of the second loudspeaker meets preset requirements, as the first capacitor can isolate the first signal, the first signal can be isolated, after the first signal passes through the first capacitor, the first signal can be accurately controlled to return to the first signal, the power amplifier can be quite correct, the feedback signal can be accurately amplified and can be determined, and the power can be quite changed, and the power signal can be correctly amplified by the first signal, and the signal can be correctly amplified by the power amplifier after the first signal is fed back through the first loudspeaker, and the first signal, and the second signal can be correctly amplified, and the second signal can be the second signal, and the second signal can be adjusted, to avoid device damage caused by excessive output power of the second speaker. Therefore, under the condition that the electronic equipment comprises the first loudspeaker and the second loudspeaker, the performance of the second loudspeaker can be presented more extremely based on the feedback signal, the tone quality of the audio signal output by the second loudspeaker is improved, and the tone quality of the electronic equipment is further improved.

With reference to the first aspect, in an embodiment of the first aspect, a distance between the first speaker and the second speaker is smaller than a preset threshold, and the power amplifier is further configured to adjust the audio signal of the first frequency based on an adjustment amplitude of the audio signal of the second frequency.

The audio circuit provided by the embodiment of the application comprises a power amplifier, a first loudspeaker, a second loudspeaker and a first capacitor, wherein the first loudspeaker and the first capacitor are connected in series to form a first circuit, the first circuit is connected with the second loudspeaker in parallel, the power amplifier is connected with the first circuit and the second loudspeaker, the distance between the first loudspeaker and the second loudspeaker is smaller than a preset threshold value, the power amplifier is used for outputting a first signal, a feedback signal is obtained when the first signal passes through the second loudspeaker, the first capacitor is used for isolating the first signal when the first signal passes through the first capacitor in the first circuit, the power amplifier is used for receiving the feedback signal, the feedback signal returns to the power amplifier along a channel between the second loudspeaker and the power amplifier, the feedback signal is used for indicating the impedance of the second loudspeaker, the power amplifier is used for outputting an audio signal with a first frequency to the first loudspeaker, the second frequency audio signal is output to the second speaker, the power amplifier is used for adjusting the second frequency audio signal based on the feedback signal so that the output power of the second speaker meets the preset requirement, the temperature of the first speaker and the temperature of the second speaker are close because the distance between the first speaker and the second speaker are smaller than the preset threshold value, and therefore, under the condition that the power amplifier cannot directly determine the impedance change of the first speaker according to the feedback signal, the adjustment amplitude of the input power of the first speaker can be adjusted based on the adjustment amplitude of the input power of the second speaker, the output power of the first speaker is higher under the condition that the failure of a device is avoided, the performance is better, which is equivalent to the fact that the performance of the first speaker is more extreme, the tone quality of the first speaker is improved, further improving the sound quality of the electronic equipment.

With reference to the first aspect, in an embodiment of the first aspect, the first speaker and the second speaker are disposed within a same cavity.

The audio circuit provided by the embodiment of the application comprises a power amplifier, a first loudspeaker, a second loudspeaker and a first capacitor, wherein the first loudspeaker and the first capacitor are connected in series to form the first circuit, the first circuit is connected with the second loudspeaker in parallel, the power amplifier is connected with the first circuit and the second loudspeaker, the distance between the first loudspeaker and the second loudspeaker is smaller than a preset threshold value, the first loudspeaker and the second loudspeaker are arranged in the same cavity, the power amplifier is used for outputting a first signal, the first signal is fed back through the second loudspeaker, when the first signal passes through the first capacitor in the first circuit, the first capacitor is used for isolating the first signal, the feedback signal returns to the power amplifier along a channel between the second loudspeaker and the power amplifier, the feedback signal is used for indicating the impedance of the second loudspeaker, the power amplifier is used for outputting an audio signal with a first frequency to the first loudspeaker, the power amplifier is used for outputting an audio signal with a second frequency to the second loudspeaker, the power amplifier is used for adjusting the audio signal with the second frequency based on the feedback signal, so that the first loudspeaker and the second loudspeaker can meet the preset power requirement of the second loudspeaker and the second loudspeaker is arranged in the same as the same cavity, and the second loudspeaker is more similar to the first loudspeaker. Because the service environment of the first loudspeaker and the service environment of the second loudspeaker are closer, the adjustment amplitude of the input power of the first loudspeaker is more accurate based on the adjustment amplitude of the input power of the second loudspeaker, so that the output power of the first loudspeaker is higher under the condition that the device is prevented from being invalid, the performance is better, the performance of the first loudspeaker can be more extreme, the tone quality of the first loudspeaker is improved, and the tone quality of electronic equipment is further improved.

With reference to the first aspect, in an embodiment of the first aspect, an impedance of the first speaker is greater than an impedance of the second speaker.

The audio circuit provided by the embodiment of the application comprises the power amplifier, the first loudspeaker, the second loudspeaker and the first capacitor, wherein the first loudspeaker and the first capacitor are connected in series to form the first circuit, the first circuit is connected with the second loudspeaker in parallel, and the power amplifier is connected with the first circuit and the second loudspeaker, wherein the impedance of the first loudspeaker is larger than that of the second loudspeaker, so that the output power of the first loudspeaker is smaller than that of the second loudspeaker, and the condition that the output power of the first loudspeaker is too high when the input power of the first loudspeaker is adjusted based on the input power of the second loudspeaker is avoided, and further the damage of devices of the first loudspeaker caused by the too high output power is avoided.

With reference to the first aspect, in an embodiment of the first aspect, the first speaker is disposed on the heat dissipating device.

The audio circuit provided by the embodiment of the application comprises the power amplifier, the first loudspeaker, the second loudspeaker and the first capacitor, wherein the first loudspeaker and the first capacitor are connected in series to form the first circuit, the first circuit is connected with the second loudspeaker in parallel, the power amplifier is connected with the first circuit and the second loudspeaker, and the first loudspeaker is arranged on the heat radiating device, so that the temperature of the first loudspeaker is lower than that of the second loudspeaker through the heat radiating device under the condition that the input power of the first loudspeaker is regulated based on the input power of the second loudspeaker, and the device failure of the first loudspeaker caused by overhigh temperature is further avoided.

With reference to the first aspect, in an embodiment of the first aspect, the second speaker generates an air flow when outputting the audio signal at the second frequency, and the first speaker is disposed in a channel of the air flow generated by the second speaker.

The audio circuit provided by the embodiment of the application comprises the power amplifier, the first loudspeaker, the second loudspeaker and the first capacitor, wherein the first loudspeaker and the first capacitor are connected in series to form the first circuit, the first circuit is connected with the second loudspeaker in parallel, the power amplifier is connected with the first circuit and the second loudspeaker, the second loudspeaker generates air flow when outputting audio signals with second frequency, the first loudspeaker is arranged in a channel of the air flow generated by the second loudspeaker, and the temperature of the first loudspeaker can be effectively reduced due to the air flow generated by the second loudspeaker, so that under the condition that the input power of the first loudspeaker is regulated based on the input power of the second loudspeaker, the temperature of the first loudspeaker is lower than that of the second loudspeaker, and therefore, the device failure caused by overhigh temperature of the first loudspeaker can be avoided.

With reference to the first aspect, in an embodiment of the first aspect, the first frequency is higher than the second frequency.

With reference to the first aspect, in an embodiment of the first aspect, the first speaker includes a tweeter.

With reference to the first aspect, in an embodiment of the first aspect, the second speaker includes a full-horn.

The audio circuit provided by the embodiment of the application comprises a power amplifier, a full-tone loudspeaker, a tweeter and a first capacitor, wherein the tweeter and the first capacitor are connected in series to form the first circuit, the first circuit is connected with the full-tone loudspeaker in parallel, the power amplifier is connected with the first circuit and the full-tone loudspeaker, the power amplifier is used for outputting a first signal, the first signal obtains a feedback signal when passing through the full-tone loudspeaker, the first signal is isolated by the first capacitor when passing through the first capacitor in the first circuit, the power amplifier is used for receiving the feedback signal, the feedback signal returns to the power amplifier along a channel between the power amplifier and the full-tone loudspeaker, the feedback signal is used for indicating the impedance of the full-tone loudspeaker, the power amplifier is used for outputting a high-frequency audio signal to the full-tone loudspeaker, the power amplifier is used for adjusting the low-frequency audio signal based on the feedback signal, so that the output power of the full-tone loudspeaker meets the preset requirement, and the using probability of the full-tone loudspeaker is higher than that of the full-tone loudspeaker, and the power can be reduced due to the fact that the power is excessively high by adjusting the full-tone loudspeaker based on the feedback signal.

With reference to the first aspect, in an embodiment of the first aspect, the power amplifier includes a Smart power amplifier Smart PA.

With reference to the first aspect, in one embodiment of the first aspect, the Smart power amplifier Smart PA includes an amplitude adjustment unit and a temperature adjustment unit;

the amplitude adjusting unit is used for adjusting the audio signal of the second frequency according to the feedback signal returned by the second loudspeaker so that the vibration amplitude of the second loudspeaker is smaller than a preset amplitude threshold value when the second loudspeaker outputs the audio signal of the second frequency;

the temperature adjusting unit is used for adjusting the audio signal of the second frequency according to the feedback signal returned by the second loudspeaker, so that the temperature of the second loudspeaker is smaller than a preset temperature threshold value when the second loudspeaker outputs the audio signal of the second frequency.

The audio module provided by the embodiment of the application comprises a power amplifier, a first loudspeaker, a second loudspeaker and a first capacitor, wherein the first loudspeaker and the first capacitor are connected in series to form a first circuit, the first circuit is connected with the second loudspeaker in parallel, the power amplifier is connected with the first circuit and the second loudspeaker, the power amplifier comprises an amplitude adjusting unit and a temperature adjusting unit, the power amplifier is used for outputting a first signal, the first signal obtains a feedback signal when passing through the second loudspeaker, when the first signal passes through the first capacitor in the first circuit, the first capacitor isolates the first signal, the power amplifier is used for receiving a feedback signal, the feedback signal returns to the power amplifier along a channel between the second loudspeaker and the power amplifier, wherein the feedback signal is used for indicating the impedance of the second loudspeaker, the power amplifier is used for outputting an audio signal with a first frequency to the first loudspeaker, the power amplifier is used for outputting an audio signal with a second frequency to the second loudspeaker, the power amplifier is used for adjusting the audio signal with the second frequency based on the feedback signal, so that the output power of the second loudspeaker meets preset requirements, the first capacitor can obtain a feedback signal when passing through the second loudspeaker, when the first signal passes through the first capacitor, the first capacitor can be isolated, the first signal can be quite changed, and the power amplifier can not normally change after the first capacitor returns to the first capacitor, the first signal, the power amplifier can normally, the signal can be returned to the power amplifier can be quite changed, and the power amplifier can normally, and the first signal can be correspondingly changed, and the first amplifier can be correspondingly, and the first signal can be returned, further, according to the corresponding relation between the impedance and the amplitude of the film on the loudspeaker, the amplitude of the film on the loudspeaker is determined, then the power of the audio signal with the second frequency is regulated according to the amplitude of the film on the loudspeaker at present, and compared with the power of the audio signal with the second frequency which is regulated and output according to the rated power of the second loudspeaker only, the performance of the second loudspeaker can be more extremely represented by using the amplitude regulating unit, and the sound quality of the electronic equipment is better; in addition, the temperature adjusting unit in the power amplifier can accurately determine the impedance change of the second speaker according to the feedback signal, further determine the temperature on the second speaker according to the corresponding relation between the impedance and the temperature of the second speaker, and then adjust the power of the audio signal outputting the second frequency according to the temperature on the second speaker.

In a second aspect, there is provided an electronic device comprising an audio circuit as described in any of the first aspects above.

In a third aspect, a power adjustment method is provided, the method being applied to an audio circuit in an electronic device, the audio circuit comprising: the power amplifier, first speaker, second speaker and first electric capacity, wherein, first speaker and first electric capacity establish ties and form first circuit, and first circuit is parallelly connected with second speaker, and power amplifier is connected with first circuit, second speaker, and the method includes:

outputting a first signal through the power amplifier, wherein the first signal obtains a feedback signal when passing through the second loudspeaker, and the first signal is isolated by the first capacitor when passing through the first capacitor in the first circuit;

receiving, by the power amplifier, a feedback signal, the feedback signal returning to the power amplifier along a path between the second speaker and the power amplifier, the feedback signal being indicative of an impedance of the second speaker;

outputting an audio signal of a first frequency to a first speaker and an audio signal of a second frequency to a second speaker through a power amplifier;

and adjusting the audio signal of the second frequency based on the fed back signal through the power amplifier so as to ensure that the output power of the second loudspeaker meets the preset requirement.

With reference to the third aspect, in an embodiment of the third aspect, a distance between the first speaker and the second speaker is smaller than a preset threshold, the method further includes: the audio signal of the first frequency is adjusted by the power amplifier based on the adjusted amplitude of the audio signal of the second frequency.

With reference to the third aspect, in one embodiment of the third aspect, the first speaker and the second speaker are disposed within the same cavity.

With reference to the third aspect, in one embodiment of the third aspect, an impedance of the first speaker is greater than an impedance of the second speaker.

With reference to the third aspect, in one embodiment of the third aspect, the first speaker is disposed on the heat sink.

With reference to the third aspect, in one embodiment of the third aspect, the second speaker generates an air flow when outputting the audio signal of the second frequency, and the first speaker is disposed in a passage of the air flow generated by the second speaker.

With reference to the third aspect, in an embodiment of the third aspect, the first frequency is higher than the second frequency.

With reference to the third aspect, in one embodiment of the third aspect, the first speaker includes a tweeter.

With reference to the third aspect, in one embodiment of the third aspect, the second speaker includes a full-horn.

With reference to the third aspect, in one embodiment of the third aspect, the power amplifier includes a Smart power amplifier Smart PA.

With reference to the third aspect, in one embodiment of the third aspect, the Smart power amplifier Smart PA includes an amplitude adjustment unit and a temperature adjustment unit; the amplitude adjusting unit is used for adjusting the audio signal of the second frequency according to the feedback signal returned by the second loudspeaker so that the vibration amplitude of the second loudspeaker is smaller than a preset amplitude threshold value when the second loudspeaker outputs the audio signal of the second frequency; the temperature adjusting unit is used for adjusting the audio signal of the second frequency according to the feedback signal returned by the second loudspeaker, so that the temperature of the second loudspeaker is smaller than a preset temperature threshold value when the second loudspeaker outputs the audio signal of the second frequency.

The audio circuit and the electronic device, wherein the audio circuit comprises a power amplifier, a first loudspeaker, a second loudspeaker and a first capacitor, wherein the first loudspeaker and the first capacitor are connected in series to form a first circuit, the first circuit is connected with the second loudspeaker in parallel, the power amplifier is connected with the first circuit and the second loudspeaker, wherein the power amplifier is used for outputting a first signal, the first signal obtains a feedback signal when passing through the second loudspeaker, the first signal is isolated by the first capacitor when passing through the first capacitor in the first circuit, the power amplifier is used for receiving a feedback signal, the feedback signal returns to the power amplifier along a channel between the second loudspeaker and the power amplifier, wherein the feedback signal is used for indicating the impedance of the second loudspeaker, the power amplifier is used for outputting an audio signal with a first frequency to the first loudspeaker, the power amplifier is used for outputting an audio signal with a second frequency to the second loudspeaker based on the feedback signal, the audio signal with the second frequency is regulated so that the output power of the second loudspeaker meets preset requirements, as the first capacitor can isolate the first signal, after the first signal is output by the power amplifier, the first signal can accurately change in the power amplifier, the feedback signal can be accurately amplified and can be returned to the first loudspeaker according to the power amplifier, the feedback signal can be accurately regulated and controlled, the feedback signal can be correctly amplified by the feedback signal, and the power amplifier can be correctly changed, and the power signal can be correctly amplified by the feedback signal can be amplified by the feedback signal when the first loudspeaker has the power signal, to avoid device damage caused by excessive output power of the second speaker. Therefore, under the condition that the electronic equipment comprises the first loudspeaker and the second loudspeaker, the performance of the second loudspeaker can be presented more extremely based on the feedback signal, the tone quality of the audio signal output by the second loudspeaker is improved, and the tone quality of the electronic equipment is further improved.

Drawings

FIG. 1 is a schematic diagram of a prior art audio module;

FIG. 2 is a schematic diagram of a hardware system suitable for use with the electronic device of the present application;

FIG. 3 is a schematic diagram of an audio circuit provided in one embodiment of the application;

FIG. 4 is a schematic diagram of the frequency response characteristics in one embodiment of the application;

FIG. 5 is a schematic diagram of an audio circuit provided in another embodiment of the application;

FIG. 6 is a schematic diagram of the positional relationship of a first speaker and a heat sink in an embodiment of the present application;

FIG. 7 is a schematic diagram of the positional relationship between a first speaker and a second speaker in one embodiment of the application;

FIG. 8 is a flow chart of a power adjustment method in accordance with an embodiment of the present application;

fig. 9 is a flowchart of a power adjustment method according to another embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application. Wherein, in the description of the embodiments of the present application, unless otherwise indicated, "/" means or, for example, a/B may represent a or B; "and/or" herein is merely an association relationship describing an association object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In addition, in the description of the embodiments of the present application, "plurality" means two or more than two.

The terms "first," "second," "third," and the like, are used below for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", or a third "may explicitly or implicitly include one or more such feature.

At present, with the development of terminal equipment, people have higher requirements on sound quality of the terminal equipment. In some terminal devices, the audio output unit is divided into a full-frequency speaker and a high-frequency speaker which are connected in parallel, the audio signals of medium frequency and low frequency are output through the full-frequency speaker, and the audio signals of high frequency are output through the high-frequency speaker, so that the tone quality of the terminal device is improved.

A power amplifier is usually provided before the audio output unit for inputting amplified audio signals to the full-range speaker and the tweeter. In one possible case, the power amplifier is a Smart power amplifier (Smart PA), where Smart PA is further configured to output a detection signal to the audio output unit, and adjust, in real time, an audio signal input to the audio output unit according to a feedback signal of the audio output unit to the detection signal, so that the audio output unit can operate in an optimal state. However, when the audio output unit in the terminal device is divided into the full-range speaker and the tweeter connected in parallel, since the full-range speaker and the tweeter have different operating frequency bands, the Smart PA cannot distinguish whether the feedback signal is the feedback signal of the full-range speaker or the feedback signal of the tweeter, and thus cannot adjust the audio signal, resulting in low sound quality of the terminal device.

In one possible case, in order to regulate the tweeter and the full-range speaker, two Smart PAs are provided in the terminal device, as shown in fig. 1, a first Smart PA and a second Smart PA, respectively. The first Smart PA is connected with the tweeter and is used for adjusting an audio signal input into the tweeter so that the output power of the tweeter meets the preset requirement. The second Smart PA is connected with the full-frequency loudspeaker and is used for adjusting the audio signal input into the full-frequency loudspeaker so that the output power of the high-frequency loudspeaker meets the preset requirement. However, the use of two Smart PAs to adjust the tweeter and the full-range speaker, respectively, results in a relatively high cost for the overall terminal device.

In view of this, the audio circuit provided in the embodiment of the present application includes a power amplifier, a first speaker, a second speaker and a first capacitor, where the first speaker and the first capacitor are connected in series to form a first circuit, the first circuit is connected in parallel to the second speaker, the power amplifier is connected to the first circuit and the second speaker, where the power amplifier is configured to output a first signal, the first signal obtains a feedback signal when passing through the second speaker, the first capacitor isolates the first signal when passing through the first capacitor in the first circuit, the power amplifier is configured to receive the feedback signal, the feedback signal returns to the power amplifier along a channel between the second speaker and the power amplifier, where the feedback signal is configured to indicate an impedance of the second speaker, the power amplifier is configured to output an audio signal of a first frequency to the first speaker 120, the power amplifier is used for adjusting the audio signal with the second frequency based on the feedback signal so that the output power of the second speaker meets the preset requirement, after the power amplifier outputs the first signal, the first signal of the channel where the first speaker is positioned is isolated by the first capacitor and cannot return the feedback signal to the power amplifier, the channel where the second speaker is positioned can normally circulate and return the feedback signal to the power amplifier, thus the feedback signal received by the power amplifier only indicates the impedance change of the second speaker, the power amplifier can accurately determine the impedance change of the second speaker according to the feedback signal and accurately regulate and control the power of the audio signal input to the second speaker, to avoid device damage caused by excessive output power of the second speaker. Therefore, under the condition that the electronic equipment comprises the first loudspeaker and the second loudspeaker, the performance of the second loudspeaker can be presented more extremely based on the feedback signal, the tone quality of the audio signal output by the second loudspeaker is improved, and the tone quality of the electronic equipment is further improved. In addition, the audio signal input to the first loudspeaker can be regulated based on the regulation of the audio signal input to the second loudspeaker, and the risk of damage to the device of the first loudspeaker caused by overlarge output power can be reduced.

The audio circuit provided by the embodiment of the application can be applied to electronic equipment. Optionally, the electronic device includes a terminal device, which may also be referred to as a terminal (terminal), a User Equipment (UE), a Mobile Station (MS), a Mobile Terminal (MT), and so on. The terminal device may be a mobile phone, a smart television, a wearable device, a tablet (Pad), a computer with wireless transceiving function, a Virtual Reality (VR) terminal device, an augmented reality (augmented reality, AR) terminal device, a wireless terminal in industrial control (industrial control), a wireless terminal in unmanned driving (self-driving), a wireless terminal in teleoperation (remote medical surgery), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation safety (transportation safety), a wireless terminal in smart city (smart city), a wireless terminal in smart home (smart home), or the like. The embodiment of the application does not limit the specific technology and the specific equipment form adopted by the terminal equipment.

By way of example, fig. 2 shows a schematic structural diagram of the electronic device 100. The electronic device 100 may include a processor 110, an external memory interface 120, an internal memory 121, a universal serial bus (universal serial bus, USB) interface 130, a charge management module 140, a power management module 141, a battery 142, an antenna 1, an antenna 2, a mobile communication module 150, a wireless communication module 160, an audio module 170, a speaker 170A, a receiver 170B, a microphone 170C, an earphone interface 170D, a sensor module 180, keys 190, a motor 191, an indicator 192, a camera 193, a display 194, and a subscriber identity module (subscriber identification module, SIM) card interface 195, etc. The sensor module 180 may include a pressure sensor 180A, a gyro sensor 180B, an air pressure sensor 180C, a magnetic sensor 180D, an acceleration sensor 180E, a distance sensor 180F, a proximity sensor 180G, a fingerprint sensor 180H, a temperature sensor 180J, a touch sensor 180K, an ambient light sensor 180L, a bone conduction sensor 180M, and the like. Wherein the audio module 170 may refer to an audio circuit.

It should be understood that the illustrated structure of the embodiment of the present application does not constitute a specific limitation on the electronic device 100. In other embodiments of the application, electronic device 100 may include more or fewer components than shown, or certain components may be combined, or certain components may be split, or different arrangements of components. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

The processor 110 may include one or more processing units, such as: the processor 110 may include an application processor (application processor, AP), a modem processor, a graphics processor (graphics processing unit, GPU), an image signal processor (image signal processor, ISP), a controller, a memory, a video codec, a digital signal processor (digital signal processor, DSP), a baseband processor, and/or a neural network processor (neural-network processing unit, NPU), etc. Wherein the different processing units may be separate devices or may be integrated in one or more processors.

The controller may be a neural hub and a command center of the electronic device 100, among others. The controller can generate operation control signals according to the instruction operation codes and the time sequence signals to finish the control of instruction fetching and instruction execution.

A memory may also be provided in the processor 110 for storing instructions and data. In some embodiments, the memory in the processor 110 is a cache memory. The memory may hold instructions or data that the processor 110 has just used or recycled. If the processor 110 needs to reuse the instruction or data, it can be called directly from the memory. Repeated accesses are avoided and the latency of the processor 110 is reduced, thereby improving the efficiency of the system.

It should be understood that the interfacing relationship between the modules illustrated in the embodiments of the present application is only illustrative, and is not meant to limit the structure of the electronic device 100. In other embodiments of the present application, the electronic device 100 may also employ different interfacing manners in the above embodiments, or a combination of multiple interfacing manners.

The electronic device 100 may implement audio functions through an audio module 170, a speaker 170A, a receiver 170B, a microphone 170C, an earphone interface 170D, an application processor, and the like. Such as music playing, recording, etc.

The audio module 170 is used to convert digital audio information into an analog audio signal output and also to convert an analog audio input into a digital audio signal. The audio module 170 may also be used to encode and decode audio signals. In some embodiments, the audio module 170 may be disposed in the processor 110, or a portion of the functional modules of the audio module 170 may be disposed in the processor 110.

In some embodiments, an intelligent power amplifier Smart PA may be included in the audio module 170 for sending a detection signal to the speaker 170A, and adjusting the power of the audio signal input to the speaker 170A according to the feedback signal returned, so that the output power of the speaker 170A is within the rated power.

The speaker 170A, also referred to as a "horn," is used to convert audio electrical signals into sound signals. The electronic device 100 may listen to music, or to hands-free conversations, through the speaker 170A.

In some embodiments, the number of speakers 170A may be 2 or 3, which is not a limitation of the present embodiments. Where the number of speakers 170A is 2, one speaker is used to output audio signals of high frequency and the other speaker is used to output audio signals of full frequency and/or low frequency.

A receiver 170B, also referred to as a "earpiece", is used to convert the audio electrical signal into a sound signal. When electronic device 100 is answering a telephone call or voice message, voice may be received by placing receiver 170B in close proximity to the human ear.

Microphone 170C, also referred to as a "microphone" or "microphone", is used to convert sound signals into electrical signals. When making a call or transmitting voice information, the user can sound near the microphone 170C through the mouth, inputting a sound signal to the microphone 170C. The electronic device 100 may be provided with at least one microphone 170C. In other embodiments, the electronic device 100 may be provided with two microphones 170C, and may implement a noise reduction function in addition to collecting sound signals. In other embodiments, the electronic device 100 may also be provided with three, four, or more microphones 170C to enable collection of sound signals, noise reduction, identification of sound sources, directional recording functions, etc.

The earphone interface 170D is used to connect a wired earphone. The headset interface 170D may be a USB interface 130 or a 3.5mm open mobile electronic device platform (open mobile terminal platform, OMTP) standard interface, a american cellular telecommunications industry association (cellular telecommunications industry association of the USA, CTIA) standard interface.

It should be noted that any of the electronic devices mentioned in the embodiments of the present application may include more or fewer modules in the electronic device 100.

The software system of the electronic device 100 may employ a layered architecture, an event driven architecture, a microkernel architecture, a microservice architecture, or a cloud architecture.

The audio circuit provided by the embodiment of the application is described in detail below with reference to fig. 3 to 7.

Fig. 3 is a schematic structural diagram of an audio circuit provided by the embodiment of the application, as shown in fig. 3, the audio circuit 100 includes a power amplifier 110, a first speaker 120, a second speaker 130 and a first capacitor 140, wherein the first speaker 120 and the first capacitor 140 are connected in series to form a first circuit 101, the first circuit 101 is connected in parallel to the second speaker 130, the power amplifier 110 is connected to the first circuit 101 and the second speaker 130, the power amplifier 110 is used for outputting a first signal, when the first signal passes through the second speaker 130, a feedback signal is obtained, when the first signal passes through the first capacitor 140 in the first circuit 101, the first capacitor 140 isolates the first signal, the power amplifier 110 is used for receiving the feedback signal, the feedback signal returns to the power amplifier 110 along a channel between the second speaker 130 and the power amplifier 110, wherein the feedback signal is used for indicating the impedance of the second speaker, the power amplifier 110 is used for outputting an audio signal of a first frequency to the first speaker 120, outputting an audio signal of a second frequency to the second speaker 130, the power amplifier 110 is used for adjusting the power of the second speaker 130 based on the feedback signal, and the second frequency is preset to meet the second audio frequency.

The first speaker 120 is configured to output an audio signal at a first frequency, the second speaker 130 is configured to output an audio signal at a second frequency, the first capacitor 140 is configured to isolate the first signal, the first signal is configured to detect an impedance of the second speaker 130, the power amplifier 110 is configured to output the audio signal at the first frequency to the first speaker 120, output the audio signal at the second frequency to the second speaker 130, and the power amplifier 110 is further configured to output the first signal, and adjust the audio signal at the second frequency based on a feedback signal returned by the second speaker 130, so that an output power of the second speaker 130 meets a preset requirement, and the feedback signal is configured to indicate the impedance of the second speaker 130.

As shown in fig. 3, the power amplifier 110, the first speaker 120, the second speaker 130, and the first capacitor 140 in the audio circuit 100. The first speaker 120 is connected in series with the first capacitor 140 to form a first circuit 101, and the first circuit 101 is connected in parallel with the second speaker 130. The power amplifier 110 is connected to the second speaker 130 and the first circuit 101, respectively.

The loudspeaker is also called as a loudspeaker, and can convert an electric signal (audio signal) into a vibrating sound signal to drive a vibrating diaphragm arranged on the loudspeaker to vibrate, so that sound which can be heard by human ears is emitted.

It will be appreciated that the frequency response characteristics of different speakers are different. Illustratively, as shown in fig. 4, the tweeter amplifies high frequency audio signals well and the woofer amplifies low frequency audio signals well. In order to improve the output sound quality of the terminal device, it is generally necessary to use different speaker outputs based on the difference in frequency of the audio signal. Illustratively, a higher frequency audio signal is output using a tweeter (e.g., first speaker 120) and a lower frequency audio signal is output using a woofer (e.g., second speaker 130).

It should be understood that, in the use process of the speaker, if the output power is too large, the vibration amplitude of the diaphragm is too large, which leads to the diaphragm cracking. Too high output power can also lead to too high temperature caused by more heating of the loudspeaker, and further cause damage to the loudspeaker. Therefore, in the use process of the loudspeaker, the vibration amplitude and the working temperature of the vibrating diaphragm of the loudspeaker need to be monitored, so that the damage of the loudspeaker is avoided.

In one possible scenario, the amplitudes and operating temperatures of the diaphragms of the first speaker 120 and the second speaker 130 may be monitored by an intelligent power amplifier Smart PA to avoid damage to the first speaker 120 and the second speaker 130.

Optionally, the power amplifier is a Smart power amplifier Smart PA.

The Smart PA may output the first signal to the first speaker 120 and the second speaker 130. The first signal may be a detection signal. In general, the frequency of the first signal is different from the operating frequency of the audio signal output by the first speaker 120, and the frequency of the first signal is also different from the operating frequency of the audio signal output by the second speaker 130. Since the first speaker 120 and the second speaker 130 can output audio signals that can be heard by the human ear, the frequency of the first signal can be generally a frequency other than the frequency that can be heard by the human ear. Normally, the human ear is most sensitive to sounds of 1000Hz to 3000 Hz. The method of generating the higher frequency signal is too complex, and therefore the frequency of the first signal is typically chosen to be lower than the frequency of the sound that can be heard by the human ear. In one possible scenario, the frequency of the first signal is 50Hz-60Hz, even though the first signal is output through the second speaker 120, and is generally not noticeable to the human ear.

Since the first speaker 120 is connected in series with the first capacitor 140, when the cutoff frequency corresponding to the capacitance value of the first capacitor 140 is the frequency of the first signal, the first signal is cut off by the first capacitor 140 when the first signal passes through the first capacitor 140. Since the first speaker 120 and the first capacitor 140 are connected in series, the first signal is cut off by the first capacitor 140, so that the Smart PA cannot receive the feedback signal returned by the first speaker 120. Also, since there is no capacitor isolating the first signal on the channel of the second speaker 130, the first signal from the Smart PA can pass through the second speaker 130 to form a feedback signal to return to the Smart PA. The feedback signal received by Smart PA is a feedback signal that passes through only the second speaker 130, and thus, the impedance change of the second speaker 130 can be fed back. Thereby enabling Smart PA to adjust the power of the audio signal output to the second speaker 130 based on the feedback signal of the second speaker 130. That is, the output power of the second speaker 130 is monitored by Smart PA, so that the performance of the second speaker 130 can be more optimally presented, and the sound quality of the second speaker is improved, and the sound quality of the electronic device including the first speaker and the second speaker is improved.

Optionally, the first frequency is higher than the second frequency.

Since the first frequency is higher than the second frequency, that is, the operating frequency of the first speaker 120 is higher than the operating frequency of the second speaker 130. The first speaker corresponds to a tweeter, and the second speaker corresponds to a woofer or a woofer. Wherein, the whole sound loudspeaker can work in the whole frequency channel, including low frequency channel and high frequency channel. However, since the operating bandwidth of the whole-tone horn is high, the frequency response characteristic of the whole-tone horn in the high frequency band is poor with respect to that of the tweeter, and the frequency response characteristic in the low frequency band is poor with respect to that of the woofer.

It should be appreciated that when the speakers are normally used for playback, the probability of playing a high pitch is small, and the probability of playing a low and medium pitch is high, and therefore, the probability of using the first speaker 120 is lower than that of using the second speaker 130. A first capacitor 140 is connected in series with the first speaker 120 such that the feedback signal is indicative of only the impedance of the second speaker 130, thereby enabling the power amplifier 110 to adjust the input power of the second speaker 130 based on the feedback signal.

The audio circuit provided by the embodiment of the application comprises a power amplifier, a full-tone loudspeaker, a tweeter and a first capacitor, wherein the tweeter and the first capacitor are connected in series to form the first circuit, the first circuit is connected with the full-tone loudspeaker in parallel, the power amplifier is connected with the first circuit and the full-tone loudspeaker, the power amplifier is used for outputting a first signal, the first signal obtains a feedback signal when passing through the full-tone loudspeaker, the first signal is isolated by the first capacitor when passing through the first capacitor in the first circuit, the power amplifier is used for receiving the feedback signal, the feedback signal returns to the power amplifier along a channel between the power amplifier and the full-tone loudspeaker, the feedback signal is used for indicating the impedance of the full-tone loudspeaker, the power amplifier is used for outputting a high-frequency audio signal to the full-tone loudspeaker, the power amplifier is used for adjusting the low-frequency audio signal based on the feedback signal, so that the output power of the full-tone loudspeaker meets the preset requirement, and the using probability of the full-tone loudspeaker is higher than the using probability of the full-tone loudspeaker, and the output power of the full-tone loudspeaker can be reduced to the maximum degree due to the fact that the power is damaged by adjusting the full-tone loudspeaker based on the feedback signal.

It should be appreciated that Smart PA may also refer to the power variation range of the power when adjusting the power of the audio signal output to the second speaker 130, so as to adaptively adjust the power level of the audio signal output to the first speaker 120, so as to avoid device damage caused by excessive output power of the first speaker 120.

The audio circuit provided by the embodiment of the application comprises a power amplifier, a first loudspeaker, a second loudspeaker and a first capacitor, wherein the first loudspeaker and the first capacitor are connected in series to form a first circuit, the first circuit is connected with the second loudspeaker in parallel, the power amplifier is connected with the first circuit and the second loudspeaker, wherein the power amplifier is used for outputting a first signal, the first signal obtains a feedback signal when passing through the second loudspeaker, the first signal is isolated by the first capacitor when passing through the first capacitor in the first circuit, the power amplifier is used for receiving a feedback signal, the feedback signal returns to the power amplifier along a channel between the second loudspeaker and the power amplifier, wherein the feedback signal is used for indicating the impedance of the second loudspeaker, the power amplifier is used for outputting an audio signal with a first frequency to the first loudspeaker, the power amplifier is used for outputting an audio signal with a second frequency to the second loudspeaker, the power amplifier is used for adjusting the audio signal with the second frequency based on the feedback signal, so that the output power of the second loudspeaker meets preset requirements, as the first capacitor can isolate the first signal, the first signal can be isolated, after the first signal passes through the first capacitor, the first signal can be accurately controlled, the power amplifier can be accurately changed in response to the power amplifier, the first signal can be accurately amplified and the power amplifier can be returned to the first amplifier after the first signal is located in the channel, the power amplifier can be quite normal, and the power can be quite normally changed, and the power can be quite correctly controlled, and the power-controlled, and the first signal can be correctly amplified, and the first and the second signal can be correctly amplified, and the second signal can be correctly changed, and the output by the first and the second signal can be adjusted, and the first and the second signal can be the, to avoid device damage caused by excessive output power of the second speaker. Therefore, under the condition that the electronic equipment comprises the first loudspeaker and the second loudspeaker, the performance of the second loudspeaker can be presented based on the feedback signal, the tone quality of an audio signal output by the second loudspeaker is improved, and the tone quality of the electronic equipment is further improved. In addition, the audio signal input to the first loudspeaker can be regulated based on the regulation of the audio signal input to the second loudspeaker, and the risk of damage to the device of the first loudspeaker caused by overlarge output power can be reduced.

Fig. 5 is a schematic structural diagram of an audio circuit according to an embodiment of the present application, as shown in fig. 5, the audio circuit 100 includes a power amplifier 110, a first speaker 120, a second speaker 130 and a first capacitor 140, wherein the first speaker 120 and the first capacitor 140 are connected in series to form a first circuit 101, the first circuit 101 is connected in parallel to the second speaker 130, the power amplifier 110 is connected to the first circuit 101 and the second speaker 130, the power amplifier 110 includes an amplitude adjustment unit 111 and a temperature adjustment unit 112, the power amplifier 110 is used for outputting a first signal, a feedback signal is obtained when the first signal passes through the second speaker 130, the first capacitor 140 isolates the first signal when the first signal passes through the first capacitor 140 in the first circuit 101, the power amplifier 110 is used for receiving the feedback signal, the feedback signal returns to the power amplifier 110 along a channel between the second speaker 130 and the power amplifier 110, wherein the feedback signal is used for indicating the impedance of the second speaker, the power amplifier 110 is used for outputting an audio signal with a first frequency to the first speaker 120 and outputting an audio signal with a second frequency to the second speaker 130, the power amplifier 110 is used for adjusting the audio signal with the second frequency based on the feedback signal so that the output power of the second speaker 130 meets the preset requirement, the amplitude adjusting unit 111 is used for adjusting the audio signal with the second frequency according to the feedback signal returned by the second speaker 130 so that the vibration amplitude of the second speaker 130 is smaller than the preset amplitude threshold when the second speaker 130 outputs the audio signal with the second frequency, the temperature adjusting unit 112 is used for adjusting the audio signal with the second frequency according to the feedback signal returned by the second speaker 130 so that when the second speaker 130 outputs the audio signal with the second frequency, the temperature of the second speaker 130 is less than a preset temperature threshold.

As shown in fig. 5, the power amplifier 110 may be Smart PA, which includes an amplitude adjustment unit 111 and a temperature adjustment unit 112, where the amplitude adjustment unit 111 is configured to adjust the audio signal of the second frequency according to the feedback signal returned by the second speaker 130, so that the vibration amplitude of the second speaker 130 is smaller than a preset amplitude threshold when the second speaker 130 outputs the audio signal of the second frequency, and the temperature adjustment unit 112 is configured to adjust the audio signal of the second frequency according to the feedback signal returned by the second speaker 130, so that the temperature of the second speaker 130 is smaller than a preset temperature threshold when the second speaker 130 outputs the audio signal of the second frequency.

The power amplifier 110 may transmit the feedback signal to the amplitude adjustment unit 111 after receiving the feedback signal. As can be seen from the embodiment shown in fig. 3, the feedback signal only indicates the impedance of the second speaker 130, so the amplitude adjustment unit 111 can determine the amplitude of the second speaker 130 at the current moment according to the correspondence between the amplitude and the impedance, and reduce the output power to the second speaker 130 when the amplitude exceeds the preset amplitude threshold, so that the vibration amplitude of the speaker membrane on the second speaker 130 is within the safe range. The amplitude adjustment unit 111 may establish a correspondence between the amplitude and the impedance through a neural network model, or may directly store a correspondence between the amplitude and the impedance, which is not limited in the embodiment of the present application.

It will be appreciated that in order to protect the speaker, the nominal power rating on the speaker is typically small. In the case that the output power of the loudspeaker is rated, the vibration amplitude of the loudspeaker membrane on the loudspeaker does not reach the limit. Therefore, the amplitude adjusting unit 111 in the power amplifier 110 adjusts the audio signal of the second frequency based on the feedback signal, so that the vibration amplitude of the second speaker 130 is smaller than the preset amplitude threshold (i.e., the limit amplitude of the second speaker 130) when the second speaker 130 outputs the audio signal of the second frequency. In this case, the signal power input to the second speaker 130 may be appropriately increased, so that the performance of the second speaker 130 may be more excellent, and thus the sound quality of the electronic device may be higher.

The power amplifier 110 may send the feedback signal to the temperature adjustment unit 112 after receiving the feedback signal. As can be seen from the embodiment shown in fig. 3, the feedback signal only indicates the impedance of the second speaker 130, so the temperature adjustment unit 112 can determine the current temperature of the second speaker 130 according to the corresponding relationship between the temperature and the impedance, and reduce the output power to the second speaker 130 when the temperature exceeds the preset temperature threshold, so that the temperature of the second speaker 130 is within the safe range. The temperature adjustment unit 112 may establish a correspondence between the temperature and the impedance through a neural network model, or may directly store a correspondence between the temperature and the impedance, which is not limited in the embodiment of the present application.

It will be appreciated that in order to protect the speaker, the nominal power rating on the speaker is typically small. In the case of a rated loudspeaker output power, the temperature at the loudspeaker has not reached a limit. Therefore, the temperature adjusting unit 112 in the power amplifier 110 adjusts the audio signal of the second frequency based on the feedback signal, so that the temperature of the second speaker 130 is less than the preset temperature threshold (i.e., the limit temperature value of the second speaker 130) when the second speaker 130 outputs the audio signal of the second frequency. In this case, the signal power input to the second speaker 130 may be appropriately increased, so that the performance of the second speaker 130 may be more excellent, and thus the sound quality of the electronic device may be better.

Optionally, the distance between the first speaker 120 and the second speaker 130 is smaller than a preset threshold, and the power amplifier 110 is further configured to adjust the audio signal of the first frequency based on the adjustment amplitude of the audio signal of the second frequency.

It should be appreciated that since the feedback signal is indicative of only the impedance of the second speaker 130, the power amplifier 110 cannot adjust the input power of the first speaker 120 (i.e., the audio signal of the first frequency) based on the feedback signal. In this case, when the distance between the first speaker 120 and the second speaker 130 is small (less than the preset threshold), the temperatures of the first speaker 120 and the second speaker 130 are close, so that the power amplifier 110 can adjust the input signal to the first speaker 120 based on the input power to the second speaker 130 (i.e., the audio signal of the second frequency) so that the temperature of the first speaker 120 does not exceed the preset temperature threshold. That is, in the case that the output power of the first speaker 120 exceeds the rated power, since the distance between the first speaker 120 and the second speaker 130 is relatively short, the temperatures of the first speaker 120 and the second speaker 130 are close, so that the power amplifier 110 can adjust the power of the audio signal of the first frequency by referring to the adjusting amplitude of the audio signal of the second frequency, so that the temperature of the first speaker 120 does not exceed the preset temperature threshold under the condition that the performance of the first speaker 120 is better, and further, damage to devices caused by excessive temperature does not occur.

Optionally, the first speaker and the second speaker are disposed within the same cavity.

In one possible case, the first speaker and the second speaker may also be disposed in the same cavity, so that the use environments of the first speaker and the second speaker may be made closer. Because the use environment of the first loudspeaker and the use environment of the second loudspeaker are closer, the adjustment amplitude of the input power of the first loudspeaker is more accurate based on the adjustment amplitude of the input power of the second loudspeaker.

Optionally, the impedance of the first speaker 120 is greater than the impedance of the second speaker 130.

It should be appreciated that since the first speaker 120 and the second speaker 130 use the same power amplifier, the input voltages of the first speaker 120 and the second speaker 130 are the same. The larger the impedance, the smaller the output power, with the same input voltage. Therefore, in the case where the input power of the first speaker 120 cannot be adjusted by the feedback signal, the impedance of the first speaker 120 is larger than the impedance of the second speaker 130, so that the output power of the first speaker 120 is smaller than the output power of the second speaker 130, and thus, when the power input to the first speaker 120 is adjusted based on the adjustment range of the input power of the second speaker 130, the output power of the first speaker 120 is smaller than the output power of the second speaker 130, so that the output power of the first speaker 120 is not excessively high.

Optionally, the first speaker 120 is disposed on the heat sink 121.

As shown in fig. 6, the heat dissipating device 121 may be a heat dissipating fin disposed on the back of the first speaker 120, or may be a heat conductive silicone grease coated on the back of the first speaker 120, which is not limited in the embodiment of the present application. The heat sink 121 may effectively reduce the temperature of the first speaker 120.

Alternatively, the second speaker 130 generates an air flow when outputting the audio signal of the second frequency, and the first speaker 120 is disposed in a passage of the air flow generated by the second speaker 130.

As shown in fig. 7, when the second speaker 130 outputs the audio signal with the second frequency, the second speaker 130 generates an airflow. For example, the horn diaphragm on the second speaker 130 vibrates the generated air flow. The first speaker 120 is disposed in a passage of the air flow generated by the second speaker 130, and the air flow increases heat dissipation of the first speaker 120, thereby lowering the temperature of the first speaker 120.

In a possible case, the power amplifier 110 further includes a processor (not shown), and the processor receives the feedback signal, converts the feedback signal into the impedance of the second speaker 130, and sends the impedance to the amplitude adjustment unit 111 and the temperature adjustment unit 112, respectively. The amplitude adjusting unit 111 adjusts the power of the audio signal with the second frequency output by the Smart PA according to the impedance change of the second speaker 130, so that the vibration amplitude of the second speaker 130 is smaller than the preset amplitude threshold when the second speaker 130 outputs the audio signal with the second frequency. The temperature adjustment unit 112 adjusts the power of the audio signal with the second frequency output by the Smart PA according to the impedance change of the second speaker 130, so that the temperature of the second speaker 130 is less than the preset temperature threshold when the second speaker 130 outputs the audio signal with the second frequency.

Fig. 8 is a flowchart of a power adjustment method according to an embodiment of the present application, as shown in fig. 8, where the method is applied to the audio circuit provided in any one of the embodiments of fig. 3 to 7, and the audio circuit includes: the power amplifier, first speaker, second speaker and first electric capacity, wherein, first speaker and first electric capacity establish ties and form first circuit, and first circuit is parallelly connected with second speaker, and power amplifier is connected with first circuit, second speaker, and the method includes:

S101, outputting a first signal through a power amplifier, obtaining a feedback signal when the first signal passes through a second loudspeaker, and isolating the first signal by the first capacitor when the first signal passes through the first capacitor in the first circuit.

S102, receiving a feedback signal through the power amplifier, wherein the feedback signal returns to the power amplifier along a channel between the second loudspeaker and the power amplifier, and the feedback signal is used for indicating the impedance of the second loudspeaker.

S103, outputting an audio signal with a first frequency to a first loudspeaker through a power amplifier, and outputting an audio signal with a second frequency to a second loudspeaker.

And S104, adjusting the audio signal of the second frequency based on the feedback signal through the power amplifier so that the output power of the second loudspeaker meets the preset requirement.

Fig. 9 is a flowchart of a power adjustment method according to another embodiment of the present application, as shown in fig. 8, where the method is applied to the audio circuit provided in any one of the embodiments of fig. 3 to 7, and the audio circuit includes: the power amplifier, first speaker, second speaker and first electric capacity, wherein, first speaker and first electric capacity establish ties and form first circuit, and first circuit is parallelly connected with second speaker, and power amplifier is connected with first circuit, second speaker, and distance between first speaker and the second speaker is less than the threshold value of predetermineeing, and this method includes:

S201, outputting a first signal through a power amplifier, obtaining a feedback signal when the first signal passes through a second loudspeaker, and isolating the first signal by the first capacitor when the first signal passes through the first capacitor in the first circuit.

S202, receiving a feedback signal through the power amplifier, wherein the feedback signal returns to the power amplifier along a channel between the second loudspeaker and the power amplifier, and the feedback signal is used for indicating the impedance of the second loudspeaker.

S203, outputting the audio signal with the first frequency to the first speaker through the power amplifier, and outputting the audio signal with the second frequency to the second speaker.

S204, adjusting the audio signal of the second frequency based on the feedback signal through the power amplifier so that the output power of the second loudspeaker meets the preset requirement.

S205, adjusting the audio signal of the first frequency based on the adjusting amplitude of the audio signal of the second frequency through the power amplifier.

Optionally, the impedance of the first speaker is greater than the impedance of the second speaker.

Optionally, the first speaker is disposed on the heat sink.

Optionally, the second speaker generates an air flow when outputting the audio signal of the second frequency, and the first speaker is disposed in a passage of the air flow generated by the second speaker.

Optionally, the first frequency is higher than the second frequency.

Optionally, the first speaker comprises a tweeter.

Optionally, the second speaker comprises a tweeter.

Optionally, the power amplifier comprises a Smart power amplifier Smart PA.

Optionally, the Smart power amplifier Smart PA includes an amplitude adjustment unit and a temperature adjustment unit; the amplitude adjusting unit is used for adjusting the audio signal of the second frequency according to the feedback signal returned by the second loudspeaker so that the vibration amplitude of the second loudspeaker is smaller than a preset amplitude threshold value when the second loudspeaker outputs the audio signal of the second frequency; the temperature adjusting unit is used for adjusting the audio signal of the second frequency according to the feedback signal returned by the second speaker so that the temperature of the second speaker is smaller than a preset temperature threshold value when the second speaker outputs the audio signal of the second frequency

The implementation principle and the advantages of the method embodiments shown in fig. 8 and fig. 9 are similar to those of the embodiments shown in fig. 3 to fig. 7, and are not repeated here.

It should be understood that, although the steps in the flowcharts in the above embodiments are sequentially shown as indicated by arrows, these steps are not necessarily sequentially performed in the order indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least a portion of the steps in the flowcharts may include a plurality of sub-steps or stages that are not necessarily performed at the same time, but may be performed at different times, the order in which the sub-steps or stages are performed is not necessarily sequential, and may be performed in turn or alternately with at least a portion of the sub-steps or stages of other steps or other steps.

In the present application, "at least one" means one or more, and "a plurality" means two or more. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (one) of a, b, or c may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or plural.

It should be understood that, in various embodiments of the present application, the sequence numbers of the foregoing processes do not mean the order of execution, and the order of execution of the processes should be determined by the functions and internal logic thereof, and should not constitute any limitation on the implementation process of the embodiments of the present application.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, and are not repeated herein.

In the several embodiments provided by the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the device embodiments described above are merely illustrative; for example, the division of the units is only one logic function division, and other division modes can be adopted in actual implementation; for example, multiple units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.

The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An audio circuit is characterized by comprising a power amplifier, a first loudspeaker, a second loudspeaker and a first capacitor, wherein the first loudspeaker and the first capacitor are connected in series to form a first circuit, the first circuit is connected with the second loudspeaker in parallel, and the power amplifier is connected with the first circuit and the second loudspeaker;

the power amplifier is used for outputting a first signal, a feedback signal is obtained when the first signal passes through the second loudspeaker, and the first signal is isolated by a first capacitor in the first circuit when the first signal passes through the first capacitor;

The power amplifier is configured to receive the feedback signal, the feedback signal returning to the power amplifier along a path between the second speaker and the power amplifier, wherein the feedback signal is configured to indicate an impedance of the second speaker;

2. The audio circuit of claim 1, wherein a distance between a first speaker and the second speaker is less than a preset threshold, the power amplifier further configured to adjust the audio signal at the first frequency based on an adjusted amplitude of the audio signal at the second frequency.

3. The audio circuit of claim 2, wherein the first speaker and the second speaker are disposed within a same cavity.

4. An audio circuit as claimed in any one of claims 1 to 3, wherein the impedance of the first speaker is greater than the impedance of the second speaker.

5. The audio circuit of any one of claims 1 to 4, wherein the first speaker is disposed on a heat sink.

6. The audio circuit of any one of claims 1 to 4, wherein the second speaker generates an airflow when outputting the audio signal at the second frequency, and the first speaker is disposed in a channel of the airflow generated by the second speaker.

7. The audio circuit of any of claims 1-6, wherein the first frequency is higher than the second frequency.

8. The audio circuit of claim 7, wherein the first speaker comprises a tweeter.

9. The audio circuit of claim 7 or 8, wherein the second speaker comprises a tweeter.

10. Audio circuit according to any of claims 1 to 9, characterized in that the power amplifier comprises a Smart power amplifier Smart PA.

11. The audio circuit of claim 10, wherein the Smart power amplifier Smart PA includes an amplitude adjustment unit and a temperature adjustment unit;

12. An electronic device comprising an audio circuit as claimed in any one of claims 1 to 11.

13. A method of power adjustment, the method being applied to an audio circuit in an electronic device, the audio circuit comprising: a power amplifier, a first speaker, a second speaker, and a first capacitor, wherein the first speaker and the first capacitor are connected in series to form a first circuit, the first circuit is connected in parallel with the second speaker, and the power amplifier is connected with the first circuit and the second speaker, the method comprising:

outputting a first signal through the power amplifier, wherein a feedback signal is obtained when the first signal passes through the second loudspeaker, and the first signal is isolated by a first capacitor in the first circuit when the first signal passes through the first capacitor;

Receiving, by the power amplifier, the feedback signal returning to the power amplifier along a path between the second speaker and the power amplifier, the feedback signal being indicative of an impedance of the second speaker;

outputting an audio signal of a first frequency to the first speaker and an audio signal of a second frequency to the second speaker through the power amplifier;

and adjusting the audio signal of the second frequency based on the feedback signal through the power amplifier so as to ensure that the output power of the second loudspeaker meets the preset requirement.

14. The method of claim 13, wherein a distance between a first speaker and the second speaker is less than a preset threshold, the method further comprising:

adjusting, by the power amplifier, the audio signal of the first frequency based on the adjusted amplitude of the audio signal of the second frequency.

15. The method of claim 14, wherein the first speaker and the second speaker are disposed within a same cavity.

16. A method according to any one of claims 13 to 15, wherein the impedance of the first speaker is greater than the impedance of the second speaker.

17. A method according to any one of claims 13 to 16, wherein the first speaker is provided on a heat sink.

18. A method according to any one of claims 13 to 16, wherein the second speaker produces an airflow when outputting the audio signal at the second frequency, and the first speaker is disposed in a passage of the airflow produced by the second speaker.

19. The method of any one of claims 13 to 18, wherein the first frequency is higher than the second frequency.

20. The method of claim 19, wherein the first speaker comprises a tweeter.

21. The method of claim 19 or 20, wherein the second speaker comprises a tweeter.

22. The method according to any of claims 13 to 21, wherein the power amplifier comprises a Smart power amplifier, smart PA.

23. The method of claim 22, wherein the Smart power amplifier Smart PA comprises an amplitude adjustment unit and a temperature adjustment unit;