Audio signal processing device, amplifier, and speaker

Abstract

The invention provides an audio signal processing device, an amplifier and a loudspeaker, and relates to the technical field of audio processing, the audio signal processing device comprises a signal processing circuit, the input end of the signal processing circuit is used for accessing a first audio signal, and the output end of the signal processing circuit is used for outputting a second audio signal; the input end of the negative feedback circuit is connected with the output end of the signal processing circuit, the output end of the negative feedback circuit is electrically connected with the signal processing circuit, and the negative feedback circuit is used for receiving a second audio signal and filtering out a first direct current signal in the second audio signal; the signal processing circuit is used for receiving the first direct current signal, processing the first direct current signal and the first audio signal and then outputting a second audio signal. According to the invention, DC bias correction of the first audio signal is realized, distortion of the audio signal is reduced, and better tone quality experience is realized.

Description

Technical Field

[0001] The present application relates to the technical field of audio processing, and in particular to an audio signal processing device, an amplifier and a speaker. Background Art

[0002] In traditional audio power amplifier designs, coupling capacitors are often used to eliminate DC components. This approach is based on the physical property of capacitors that they can block DC but allow AC to pass through, with the goal of removing the DC component from the signal. However, the audio signal processed using this method is often accompanied by significant distortion, resulting in an unsatisfactory sound quality experience. Summary of the invention

[0003] The main purpose of the present invention is to provide an audio signal processing device, aiming to reduce the distortion of the audio signal and achieve a better sound quality experience.

[0004] To achieve the above object, the present invention provides an audio signal processing device, the device comprising: a signal processing circuit, wherein an input end of the signal processing circuit is used to receive a first audio signal, and an output end of the signal processing circuit is used to output a second audio signal; a negative feedback circuit, wherein an input end of the negative feedback circuit is connected to an output end of the signal processing circuit, an output end of the negative feedback circuit is electrically connected to the signal processing circuit, and the negative feedback circuit is used to receive the second audio signal and filter out a first DC signal in the second audio signal; The signal processing circuit is used to receive the first DC signal and process the first DC signal and the first audio signal to output the second audio signal.

[0005] Optionally, the signal processing circuit includes: an adder circuit, wherein a first input end of the adder circuit is used to receive a first audio signal, a second input end of the adder circuit is connected to an output end of the negative feedback circuit, and the adder circuit is used to process the DC signal and the first audio signal; or, A control circuit, wherein a first input terminal of the control circuit is used to receive a first audio signal, a second input terminal of the control circuit is connected to an output terminal of the negative feedback circuit, and the control circuit is used to process the DC signal and the first audio signal.

[0006] Optionally, the adder circuit comprises: An operational amplifier, wherein the non-phase terminal of the operational amplifier is used to receive the first audio signal, the inverting terminal of the operational amplifier is connected to the output terminal of the negative feedback circuit, and the operational amplifier is used to perform difference processing on the DC signal and the first audio signal.

[0007] Optionally, the negative feedback circuit includes: a filter circuit, wherein an input end of the filter circuit is connected to an output end of the signal processing circuit, and the filter circuit is used to filter out a DC component in the second audio signal to obtain a DC signal; A regulating circuit, wherein the input end of the regulating circuit is connected to the output end of the filtering circuit, the output end of the regulating circuit is connected to the input end of the signal processing circuit, and the regulating circuit is used to output a first DC signal after processing the DC signal according to a preset adjustment ratio.

[0008] Optionally, the filtering circuit includes an N-th order low-pass filter, wherein N is a positive integer greater than or equal to 1.

[0009] Optionally, the negative feedback circuit includes: A buffer circuit, wherein the input end of the buffer circuit is connected to the output end of the signal processing circuit, the output end of the buffer circuit is connected to the input end of the filter circuit, and the buffer circuit is used to isolate and output the second audio signal.

[0010] Optionally, the negative feedback circuit includes: An integration circuit, wherein the input end of the integration circuit is connected to the output end of the filter circuit, and the output end of the integration circuit is connected to the input end of the signal processing circuit.

[0011] Optionally, the signal processing circuit is also used to process the second DC signal and the first audio signal to obtain a third audio signal after processing, and to output the second audio signal after performing gain adjustment on the third audio signal according to a preset gain adjustment coefficient and / or performing bandwidth adjustment on the third audio signal according to a preset bandwidth adjustment coefficient.

[0012] Optionally, when the signal processing circuit includes an adder circuit, the signal processing circuit further includes a control circuit; The first input end of the adder circuit is used to receive the first audio signal, the second input end of the adder circuit is connected to the output end of the negative feedback circuit, the output end of the adder circuit is connected to the output end of the control circuit, the adder circuit is used to process the second DC signal and the first audio signal and obtain a third audio signal after processing, and the control circuit is used to adjust the gain of the third audio signal according to a preset gain adjustment coefficient and / or adjust the bandwidth according to a preset bandwidth adjustment coefficient and then output the second audio signal.

[0013] In addition, to achieve the above object, the present invention further provides an amplifier, which includes a power amplifier circuit and the audio signal processing device as described above, wherein the output end of the audio signal processing device is connected to the input end of the power amplifier circuit.

[0014] In addition, to achieve the above object, the present invention further provides a speaker, characterized in that it includes the audio signal processing device as described above; and / or, an amplifier as described above.

[0015] In the embodiment of the present invention, a first audio signal is connected to the input end of a signal processing circuit, and a second audio signal is outputted at the output end of the signal processing circuit. Then, a negative feedback circuit is provided to receive the second audio signal and filter out a first DC signal in the second audio signal. Then, the first DC signal is received through the signal processing circuit, and the first DC signal and the first audio signal are processed before outputting the second audio signal, so as to correct the DC bias of the first audio signal, reduce the distortion of the audio signal, and achieve a better sound quality experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 is a circuit block diagram of an audio signal processing device according to an embodiment of the present invention; Figure 2 is a circuit block diagram of an audio signal processing device according to another embodiment of the present invention; Figure 3 A circuit block diagram of an audio signal processing device according to another embodiment of the present invention; Figure 4 A circuit block diagram of an audio signal processing device according to another embodiment of the present invention; Figure 5 A circuit block diagram of an audio signal processing device according to another embodiment of the present invention; Figure 6 is a circuit block diagram of an audio signal processing device according to another embodiment of the present invention; Figure 7 FIG. 4 is a circuit block diagram of an audio signal processing device according to another embodiment of the present invention.

[0019] Description of Figure Numbers:

[0020] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments, and the well-known modules, units and their connections, links, communications or operations are not shown or described in detail. In addition, the described features, architectures or functions can be combined in any way in one or more embodiments. It should be understood by those skilled in the art that the various embodiments described below are only for illustration and not for limiting the scope of protection of the present invention. It can also be easily understood that the modules or units or processing methods in the various embodiments described herein and shown in the drawings can be combined and designed according to various different configurations. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0022] The limitations of various nouns or methods referred to in the following embodiments, except for those that are logically untenable, are generally based on the broad concepts that can be implemented under the premise of the disclosure in the embodiments. Under such understanding, the various specific subordinate specific limitations of the nouns or methods should be regarded as the inventive content of the present invention, and should not be understood narrowly or interpreted in a biased manner on the grounds that the specification does not disclose the specific limitations. Similarly, under the premise that it can be implemented logically, the order of the steps in the method is flexible and changeable, and the specific subordinate specific limitations in the broad concepts of various nouns or methods all fall within the scope of protection of the present invention.

[0023] The main solution of the embodiment of the present application is: a first audio signal is connected through the input end of a signal processing circuit, a second audio signal is outputted from the output end of the signal processing circuit, the second audio signal is received through a negative feedback circuit and the first DC signal in the second audio signal is filtered out, the first DC signal is received through the signal processing circuit and the first DC signal is inverted to obtain a second DC signal, and finally the second DC signal and the first audio signal are superimposed through the signal processing circuit to output the second audio signal.

[0024] In the design of audio power amplifiers in the prior art, coupling capacitors are usually used to eliminate DC components. This approach is based on the physical property that capacitors can block DC and allow AC to pass through, with the purpose of removing the DC component in the signal. However, the audio signal processed by this method is often accompanied by greater distortion, resulting in unsatisfactory sound quality experience.

[0025] The present application provides a solution to achieve DC offset correction of a first audio signal, reduce distortion of the audio signal, and achieve a better sound quality experience.

[0026] Reference Figure 1 In one embodiment of the present invention, the audio signal processing device includes a signal processing circuit 100 and a negative feedback circuit 200, wherein: The input end of the signal processing circuit 100 is used to receive the first audio signal Sin, and the output end of the signal processing circuit 100 is used to output the second audio signal Sout; the input end of the negative feedback circuit 200 is connected to the output end of the signal processing circuit 100, and the output end of the negative feedback circuit 200 is electrically connected to the signal processing circuit 100, and the negative feedback circuit 200 is used to receive the second audio signal Sout and filter out the first DC signal in the second audio signal Sout; The signal processing circuit 100 is used to receive a first DC signal and process the first DC signal and a first audio signal Sin to output a second audio signal Sout.

[0027] In this embodiment, the signal-to-noise ratio of the signal can be effectively improved by processing the first audio signal Sin through the signal processing circuit 100, and the introduction of the negative feedback circuit 200 further ensures the stability and accuracy of the signal processing circuit 100. The processing process of the signal processing circuit 100 includes at least one of the processes of signal amplification, filtering, gain adjustment, bandwidth adjustment, and frequency compensation, so that the output second audio signal Sout has better sound quality and less noise. The negative feedback circuit 200 filters out the first DC signal in the second audio signal Sout and feeds it back to the input end of the signal processing circuit 100. The negative feedback circuit 200 can effectively stabilize the DC operating point of the entire system to ensure that the output signal has less noise and stronger stability.

[0028] In practical applications, the audio signal processing device can be widely used in various audio devices, such as sound systems, recording equipment, communication equipment, etc. By optimizing the design of the signal processing circuit 100 and the negative feedback circuit 200, the sound quality, stability and anti-interference ability of these devices can be significantly improved, thereby providing users with a better and more comfortable listening experience.

[0029] In this embodiment, the first audio signal Sin is connected to the input end of the signal processing circuit 100, and the output end of the signal processing circuit 100 outputs the second audio signal Sout. Then, a negative feedback circuit 200 is provided to receive the second audio signal Sout and filter out the first DC signal in the second audio signal Sout. Then, the signal processing circuit 100 receives the first DC signal and processes the first DC signal and the first audio signal Sin to output the second audio signal Sout, so as to realize DC bias correction of the first audio signal Sin, reduce distortion of the audio signal, and achieve better sound quality experience.

[0030] Optionally, refer to Figure 2 Another embodiment of the present invention provides an audio signal processing device based on the above Figure 1 In the illustrated embodiment, the signal processing circuit 100 includes an adder circuit 110, wherein: The first input terminal of the adder circuit 110 is used to receive the first audio signal Sin, and the second input terminal of the adder circuit 110 is connected to the output terminal of the negative feedback circuit 200. The adder circuit 110 is used to process the DC signal and the first audio signal Sin.

[0031] In this embodiment, the adder circuit 110 can use a half adder or a full adder to achieve the required signal superposition processing function. The half adder is suitable for processing the addition of two one-bit binary numbers, while the full adder can process the addition of two one-bit binary numbers and a carry input.

[0032] The second DC signal obtained by inverting the DC signal has a polarity opposite to that of the original DC signal. Thus, when the second DC signal is superimposed on the first audio signal Sin, the DC component in the first audio signal Sin can be effectively eliminated, thereby avoiding adverse effects on subsequent circuits.

[0033] Optionally, the adder can be an operational amplifier, and the positive phase terminal of the operational amplifier is connected to the first audio signal, and the negative phase terminal of the operational amplifier is connected to the output terminal of the negative feedback circuit, so that the operational amplifier performs a difference process between the DC signal and the first audio signal, that is, the DC component in the first audio signal and the DC signal are subtracted to reduce the DC component in the first audio signal to improve the quality of the audio signal. This processing method utilizes the high gain and negative feedback mechanism of the operational amplifier, and can effectively remove the undesirable DC component in the audio signal, making the subsequent signal processing or audio playback purer and clearer.

[0034] Optionally, refer to Figure 3 Another embodiment of the present invention provides an audio signal processing device based on the above Figure 1 In the illustrated embodiment, the signal processing circuit 100 comprises a control circuit 120, wherein: The first input terminal of the control circuit 120 is used to receive the first audio signal Sin, and the second input terminal of the control circuit 120 is connected to the output terminal of the negative feedback circuit 200. The control circuit 120 is used to process the DC signal and the first audio signal Sin.

[0035] In this embodiment, the control circuit 120 can be implemented by a main controller, such as MCU (Microcontroller Unit), DSP (Digital Signal Process), FPGA (Field Programmable Gate Array), SOC (System On Chip), etc. By adopting advanced microcontrollers, digital signal processing chips, programmable logic gate array chips or system-on-chips, complex and accurate signal superposition processing can be achieved, thereby improving the performance and reliability of the circuit.

[0036] The control circuit 120 can implement the addition and subtraction functions of the adder to perform signal superposition or difference processing. Optionally, in this embodiment, the first audio signal and the DC signal are subtracted. When the second DC signal is subtracted from the first audio signal Sin, the DC component in the first audio signal Sin can be effectively eliminated, thereby avoiding adverse effects on subsequent circuits.

[0037] Among them, the addition and subtraction functions of the adder are realized by the control circuit 120, and accurate signal processing can be realized through programming control. For example, a configurable adder module can be designed using FPGA, and the module can adjust the weight of the addition or subtraction operation as needed to meet the needs of different signal processing scenarios. In addition, the parallel processing capability of FPGA enables multiple signals to be processed at the same time, which greatly improves the processing speed and efficiency of the circuit.

[0038] Optionally, refer to Figure 4 Another embodiment of the present invention provides an audio signal processing device based on the above Figure 1 In the illustrated embodiment, the negative feedback circuit 200 includes a filter circuit 210 and a regulating circuit 220, wherein: The input end of the filter circuit 210 is connected to the output end of the signal processing circuit 100, and the filter circuit 210 is used to filter out the DC component in the second audio signal Sout to obtain a DC signal; the input end of the adjustment circuit 220 is connected to the output end of the filter circuit 210, and the output end of the adjustment circuit 220 is connected to the input end of the signal processing circuit 100, and the adjustment circuit 220 is used to process the DC signal according to a preset adjustment ratio and then output a first DC signal.

[0039] In this embodiment, the design of the negative feedback circuit 200 is intended to improve the stability and accuracy of the signal processing circuit 100. Through the coordinated work of the filter circuit 210 and the adjustment circuit 220, noise and interference in the signal can be effectively suppressed to ensure the quality of the output signal.

[0040] The filter circuit 210 is usually designed as a low-pass filter, and its cut-off frequency is set below the highest frequency of the audio signal to ensure that the DC component can be accurately separated. In order to improve the filtering effect, the filter circuit 210 may include multiple cascaded RC filters, or adopt a more complex active filter design, such as Butterworth, Chebyshev or elliptic filters.

[0041] The regulating circuit 220 is designed according to specific application requirements. It can be a proportional circuit. By presetting the adjustment ratio, the regulating circuit 220 can accurately amplify or attenuate the DC signal to meet the requirements of the signal processing circuit 100 for the input signal.

[0042] Optionally, the filtering circuit 210 includes an N-th order low-pass filter, wherein N is a positive integer greater than or equal to 1.

[0043] In this embodiment, the order N of the filter circuit 210 can be determined according to the requirements for signal processing accuracy in practical applications. For example, when higher filtering accuracy is required, a higher order filter, such as a second-order or third-order filter, can be selected to obtain a steeper roll-off characteristic, thereby more effectively filtering out unwanted high-frequency noise. The design of the adjustment circuit 220 is equally important. It needs to set a suitable amplification or attenuation ratio according to the characteristics of the signal processing circuit 100 to ensure the stability and accuracy of the signal. In some cases, the adjustment circuit 220 may also include an integrator or a differentiator to further optimize the signal processing effect. Through a carefully designed negative feedback circuit 200, the performance of the entire audio signal processing device can be significantly improved, so that it can maintain a good working condition in various complex environments.

[0044] Optionally, refer to Figure 5 Another embodiment of the present invention provides an audio signal processing device based on the above Figure 4 In the illustrated embodiment, the negative feedback circuit 200 includes a buffer circuit 230, wherein: The input end of the buffer circuit 230 is connected to the output end of the signal processing circuit 100 , and the output end of the buffer circuit 230 is connected to the input end of the filter circuit 210 . The buffer circuit 230 is used to isolate and output the second audio signal Sout.

[0045] In this embodiment, the buffer circuit 230 is mainly used to realize the isolation function, so that the signal processing circuit 100 can normally output the audio signal to the subsequent device, and minimize the impact of the feedback circuit on the load change of the subsequent device. The isolation function of the buffer circuit 230 ensures the stable transmission of the signal, prevents the signal entering the filter from flowing back to the signal processing circuit 100, and thus ensures the performance of the entire negative feedback circuit 200.

[0046] Among them, the buffer circuit 230 can adopt a high input impedance design to ensure that there is no load effect on the output of the signal processing circuit 100. In addition, the buffer circuit 230 also has a low output impedance characteristic to ensure that the signal can be stably transmitted to the filter circuit 210, thereby maintaining the integrity of the signal. The filter circuit 210 is responsible for removing noise and interference in the signal to ensure that the final output audio signal is pure and clear. Through such a design, the negative feedback circuit 200 can effectively improve the performance and stability of the entire system.

[0047] Optionally, refer to Figure 6 Another embodiment of the present invention provides an audio signal processing device based on the above Figure 4 In the illustrated embodiment, the negative feedback circuit 200 includes an integration circuit 240, wherein: An input terminal of the integration circuit 240 is connected to an output terminal of the filter circuit 210 , and an output terminal of the integration circuit 240 is connected to an input terminal of the signal processing circuit 100 .

[0048] In this embodiment, in actual use, since there is often still a certain signal error between the first audio signal Sin and the second audio signal Sout in a stable state, the function of the integration circuit 240 is to compensate for these errors. Through the integration function of the integration circuit 240, the error signal can be integrated to generate a compensation signal proportional to the error signal. This compensation signal is then sent to the signal processing circuit 100 and superimposed with the original signal to reduce or eliminate the signal error and improve the stability and accuracy of the entire circuit system.

[0049] Among them, the integration circuit 240 can be composed of an operational amplifier, a resistor and a capacitor, and its working principle is to use a capacitor to perform an integration operation on the input signal. When the input signal is positive, the capacitor is charged; when the input signal is negative, the capacitor is discharged. In this way, the integration circuit 240 can respond to the cumulative effect of the input signal, thereby realizing compensation of the error signal. In the signal processing circuit 100, the superposition of the compensation signal and the original signal is realized by an adder, which adds the two signals and finally outputs a stable signal with a smaller error.

[0050] Optionally, refer to Figure 7 Another embodiment of the present invention provides an audio signal processing device based on the above Figures 1 to 6 In any of the embodiments shown, the signal processing circuit 100 is further used to process the second DC signal and the first audio signal Sin to obtain a third audio signal after processing, and to output a second audio signal Sout after performing gain adjustment on the third audio signal according to a preset gain adjustment coefficient and / or performing bandwidth adjustment on the third audio signal according to a preset bandwidth adjustment coefficient.

[0051] In this embodiment, the design of the signal processing circuit 100 can adopt advanced digital signal processing technology to ensure the high fidelity and low distortion rate of the audio signal during the superposition, gain adjustment and bandwidth adjustment processes. The second audio signal Sout finally output not only retains the clarity of the original audio, but also enhances the stability and reliability of the signal, meeting the strict requirements of various professional occasions on audio quality.

[0052] The superposition processing of the second DC signal and the first audio signal Sin can be performed by using an operational amplifier, and by connecting the second DC signal to the inverting terminal of the operational amplifier, the second DC signal and the first audio signal Sin can be negatively superimposed, that is, subtracted, to eliminate or reduce the DC component of the first audio signal Sin.

[0053] In the process of processing the signal, the signal processing circuit 100 will perform superposition processing on the second DC signal and the first audio signal Sin, wherein the second DC signal is an inverted DC signal, which is opposite to the DC signal in the first audio signal Sin, thereby effectively eliminating the DC component in the first audio signal Sin. This can not only improve the accuracy of signal processing, but also reduce potential noise interference caused by the DC component.

[0054] In addition, the bandwidth of the third audio signal after superposition processing is adjusted to filter out unnecessary frequency components, greatly optimizing the quality of the audio signal. Gain adjustment is achieved through a digital amplifier, which can automatically adjust the amplitude of the output signal according to the strength of the input signal to ensure consistent listening effects at different volume levels. Finally, the finely processed second audio signal Sout is not only suitable for high-fidelity audio systems, but also for communication equipment that requires signal stability and high clarity.

[0055] Optionally, when the signal processing circuit 100 includes the adder circuit 110, the signal processing circuit 100 further includes a control circuit 120, wherein: The first input end of the adder circuit 110 is used to receive the first audio signal Sin, the second input end of the adder circuit 110 is connected to the output end of the negative feedback circuit 200, the output end of the adder circuit 110 is connected to the output end of the control circuit 120, the adder circuit 110 is used to process the second DC signal and the first audio signal Sin and obtain a third audio signal after processing, and the control circuit 120 is used to adjust the gain of the third audio signal according to a preset gain adjustment coefficient and / or adjust the bandwidth according to a preset bandwidth adjustment coefficient, and then output a second audio signal Sout.

[0056] In this embodiment, the control circuit 120 can be implemented by a main controller, such as MCU (Microcontroller Unit), DSP (Digital Signal Process), FPGA (Field Programmable Gate Array), SOC (System On Chip), etc. By adopting advanced microcontrollers, digital signal processing chips, programmable logic gate array chips or system-on-chips, complex and accurate signal superposition processing can be achieved, thereby improving the performance and reliability of the circuit.

[0057] Among them, the control circuit 120 realizes precise control of the gain adjustment coefficient and the bandwidth adjustment coefficient. It can dynamically adjust these parameters according to different application scenarios and requirements to achieve the best audio processing effect. For example, in an environment with more noise, the main controller can automatically increase the bandwidth adjustment coefficient to filter out more noise frequency components and ensure the clarity of the audio signal. In situations where low-frequency or high-frequency components need to be emphasized, the main controller can adjust the gain adjustment coefficient accordingly to enhance the signal strength within a specific frequency range. The adder circuit 110 accurately superimposes the second DC signal with the first audio signal Sin to ensure the accuracy and efficiency of signal processing. The design of the adder circuit 110 allows it to maintain the integrity of the signal during processing while eliminating unnecessary DC components, which is crucial to improving the quality of the final audio signal. The control circuit 120 ensures the adaptability and stability of the audio signal in various environments by precisely controlling the gain and bandwidth adjustment coefficients.

[0058] The present invention further provides an amplifier, which includes a power amplifier circuit and an audio signal processing device as described in all the above embodiments, wherein the output end of the audio signal processing device is connected to the input end of the power amplifier circuit.

[0059] It is worth noting that, since the amplifier of the present invention is based on the above-mentioned audio signal processing device, the embodiments of the amplifier of the present invention include all technical solutions of all embodiments of the above-mentioned audio signal processing device, and the technical effects achieved are also exactly the same, which will not be repeated here.

[0060] The present invention further provides a loudspeaker, comprising the audio signal processing device as described in all the above embodiments; and / or, the amplifier as described in all the above embodiments.

[0061] It is worth noting that, since the loudspeaker of the present invention is based on the above-mentioned amplifier, the embodiments of the loudspeaker of the present invention include all technical solutions of all the embodiments of the above-mentioned amplifier, and the technical effects achieved are also exactly the same, which will not be repeated here.

[0062] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or system. In the absence of further restrictions, an element defined by the sentence "includes a ..." does not exclude the existence of other identical elements in the process, method, article or system including the element.

[0063] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0064] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as above, and includes a number of instructions for a terminal device (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods of various embodiments of the present invention.

[0065] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An audio signal processing device, characterized in that: The device comprises: a signal processing circuit, wherein an input end of the signal processing circuit is used to receive a first audio signal, and an output end of the signal processing circuit is used to output a second audio signal; a negative feedback circuit, wherein an input end of the negative feedback circuit is connected to an output end of the signal processing circuit, an output end of the negative feedback circuit is electrically connected to the signal processing circuit, and the negative feedback circuit is used to receive the second audio signal and filter out a first DC signal in the second audio signal; The signal processing circuit is used to receive the first DC signal and process the first DC signal and the first audio signal to output the second audio signal.

2. The audio signal processing device according to claim 1, characterized in that: The signal processing circuit includes: an adder circuit, wherein a first input end of the adder circuit is used to receive a first audio signal, a second input end of the adder circuit is connected to an output end of the negative feedback circuit, and the adder circuit is used to process the DC signal and the first audio signal; or, A control circuit, wherein a first input terminal of the control circuit is used to receive a first audio signal, a second input terminal of the control circuit is connected to an output terminal of the negative feedback circuit, and the control circuit is used to process the DC signal and the first audio signal.

3. The audio signal processing device according to claim 2, characterized in that: The adder circuit comprises: An operational amplifier, wherein the non-phase terminal of the operational amplifier is used to receive the first audio signal, the inverting terminal of the operational amplifier is connected to the output terminal of the negative feedback circuit, and the operational amplifier is used to perform difference processing on the DC signal and the first audio signal.

4. The audio signal processing device according to claim 1, characterized in that: The negative feedback circuit includes: a filter circuit, wherein an input end of the filter circuit is connected to an output end of the signal processing circuit, and the filter circuit is used to filter out a DC component in the second audio signal to obtain a DC signal; A regulating circuit, wherein the input end of the regulating circuit is connected to the output end of the filtering circuit, the output end of the regulating circuit is connected to the input end of the signal processing circuit, and the regulating circuit is used to output a first DC signal after processing the DC signal according to a preset adjustment ratio.

5. The audio signal processing device according to claim 4, characterized in that: The filtering circuit includes an N-th order low-pass filter, wherein N is a positive integer greater than or equal to 1.

6. The audio signal processing device according to claim 4, characterized in that: The negative feedback circuit comprises: A buffer circuit, wherein the input end of the buffer circuit is connected to the output end of the signal processing circuit, the output end of the buffer circuit is connected to the input end of the filter circuit, and the buffer circuit is used to isolate and output the second audio signal.

7. The audio signal processing device according to claim 4, characterized in that: The negative feedback circuit comprises: An integration circuit, wherein the input end of the integration circuit is connected to the output end of the filter circuit, and the output end of the integration circuit is connected to the input end of the signal processing circuit.

8. The audio signal processing device according to any one of claims 1 to 7, characterized in that: The signal processing circuit is further used to process the second DC signal and the first audio signal to obtain a third audio signal after processing, and to adjust the gain of the third audio signal according to a preset gain adjustment coefficient and / or adjust the bandwidth according to a preset bandwidth adjustment coefficient before outputting the second audio signal.

9. The audio signal processing device according to claim 8, characterized in that: When the signal processing circuit includes an adder circuit, the signal processing circuit further includes a control circuit; The first input end of the adder circuit is used to receive the first audio signal, the second input end of the adder circuit is connected to the output end of the negative feedback circuit, the output end of the adder circuit is connected to the output end of the control circuit, the adder circuit is used to process the second DC signal and the first audio signal and obtain a third audio signal after processing, and the control circuit is used to adjust the gain of the third audio signal according to a preset gain adjustment coefficient and / or adjust the bandwidth according to a preset bandwidth adjustment coefficient and then output the second audio signal.

10. An amplifier, characterized in that: The amplifier comprises a power amplifier circuit and the audio signal processing device according to any one of claims 1 to 9, and an output end of the audio signal processing device is connected to an input end of the power amplifier circuit.

11. A loudspeaker, characterized in that: comprising the audio signal processing device according to any one of claims 1 to 9; And / or, an amplifier as claimed in claim 10.

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