Audio signal processor and sound system

Abstract

The utility model discloses an audio signal processor and a sound system, and the processor comprises a signal input unit which comprises an audio balance circuit and a signal synthesis circuit; the audio balancing circuit is used for balancing left and right channel audio signals; the signal synthesis circuit is used for synthesizing the signal output by the audio balance circuit and the signal collected by the sound pickup; the first processing unit comprises a differential processing circuit and a first high-pass filter; the second processing unit comprises an integral processing circuit and a second high-pass filter; the input end of the second high-pass filter is electrically connected with the output end of the left and right channel signal front plate; the output end of the second high-pass filter is electrically connected with the input end of the integral processing circuit; and the feedback processing circuit is used for feeding back and processing the audio signal. The sound equipment equipped with the audio signal processor provided by the utility model can be applied to any scene, can eliminate high-frequency self-excitation, and achieves the effect of protecting a tweeter and ears and eardrums of people.

Description

Technical Field

[0001] The utility model belongs to the field of sound systems, in particular to an audio signal processor and a sound system. Background Art

[0002] In current audio equipment, audio signals are processed only through various internal and external processing circuits and control modules. This type of audio can only be used in a single scenario. If the usage scenario of the audio changes, such as when a home audio system is used in an open environment, the audio system needs to be re-tuned to adapt to the changed scenario and play music with more appropriate sound quality. However, the re-tuning process is not only cumbersome, but the effect of the sound quality change is usually not obvious, which limits the usage scenario of a single type of audio system. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides an audio signal processor, which provides an audio signal processor capable of modifying an audio signal to be played according to feedback from ambient audio.

[0004] In a first aspect, an embodiment of the utility model provides an audio signal processor, which is applied to an audio system, wherein the audio system includes a left and right channel balanced amplifier, a left and right channel signal pre-board, a left and right channel power amplifier, a pickup and a speaker, and the processor includes:

[0005] The signal input unit comprises an audio balance circuit and a signal synthesis circuit; the input end of the audio balance circuit is electrically connected to the output end of the left and right channel balanced amplifier; the input end of the signal synthesis circuit is electrically connected to the output end of the audio balance circuit and the output end of the pickup respectively; the signal synthesis circuit is used to synthesize the signal output by the audio balance circuit and the signal collected by the pickup;

[0006] A first processing unit includes a differential processing circuit and a first high-pass filter; an input end of the first high-pass filter is electrically connected to an output end of the signal synthesis circuit; an output end of the first high-pass filter is electrically connected to an input end of the differential processing circuit; and an output end of the differential processing circuit is electrically connected to an input end of the left and right channel signal pre-plate;

[0007] The second processing unit includes an integral processing circuit and a second high-pass filter; the input end of the second high-pass filter is electrically connected to the output end of the left and right channel signal pre-plate; the output end of the second high-pass filter is electrically connected to the input end of the integral processing circuit;

[0008] A feedback processing circuit, wherein the feedback end of the feedback processing circuit is electrically connected to the output end of the integration processing circuit; the input end of the feedback processing circuit is electrically connected to the output end of the left and right channel power amplifiers; and the output end of the left and right channel power amplifiers is also electrically connected to the speaker.

[0009] In some embodiments of the present utility model, the signal input unit includes a first signal input unit and a second signal input unit; the input end of the first audio balance circuit of the first signal input unit is electrically connected to the left channel signal output end of the left and right channel balanced amplifier, the output end of the first audio balance circuit is electrically connected to the input end of the first signal synthesis circuit of the first signal input unit, and the output end of the first signal synthesis circuit is electrically connected to the first high-pass filter; the second audio balance circuit of the second signal input unit is electrically connected to the right channel signal output end of the left and right channel balanced amplifier, the output end of the second audio balance circuit is electrically connected to the input end of the second signal synthesis circuit of the second signal input unit, and the output end of the second signal synthesis circuit is electrically connected to the first high-pass filter.

[0010] In some embodiments of the present utility model, the signal synthesis circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first capacitor and a second capacitor; the output end of the pickup is electrically connected to the first end of the first resistor and the first end of the second resistor, respectively; the second end of the first resistor is electrically connected to the first end of the first capacitor and is grounded, the second end of the first capacitor is electrically connected to the output end of the audio balance circuit, and the second end of the first capacitor is also electrically connected to the first end of the third resistor; the first end of the second resistor is electrically connected to the first end of the third resistor and the first end of the second capacitor, respectively; the second end of the third resistor is electrically connected to the first end of the fourth resistor; the second end of the fourth resistor is electrically connected to the input end of the first high-pass filter; the second end of the second capacitor is electrically connected to the first end of the fifth resistor, and the second end of the fifth resistor is electrically connected to the input end of the first high-pass filter.

[0011] In some embodiments of the present invention, the differential processing circuit includes a first differential processing circuit and a second differential processing circuit; the non-inverting input terminal of the first differential processing circuit is electrically connected to the output terminal of the first high-pass filter, and the inverting input terminal of the second differential processing circuit is electrically connected to the output terminal of the first high-pass filter.

[0012] In some embodiments of the utility model, the integration processing circuit includes a sixth resistor, a third capacitor and a fourth capacitor; the first end of the sixth resistor is electrically connected to the output end of the second high-pass filter, and the second end of the sixth resistor is respectively connected to the first end of the third capacitor and the first end of the fourth capacitor; the second end of the third capacitor and the second end of the fourth capacitor are both grounded.

[0013] In some embodiments of the present invention, the first high-pass filter includes a seventh resistor, an eighth resistor and a fifth capacitor; the first end of the seventh resistor is electrically connected to the output end of the signal synthesis circuit, and the second end of the seventh resistor is electrically connected to the first end of the eighth resistor and the first end of the fifth capacitor respectively; the second end of the eighth resistor is grounded; the second end of the fifth capacitor is electrically connected to the input end of the differential processing circuit.

[0014] In some embodiments of the utility model, the second high-pass filter includes a sixth capacitor, a seventh capacitor, a ninth resistor and a tenth resistor; the first end of the sixth capacitor is electrically connected to the output end of the left and right channel signal pre-plate, and the second end of the sixth capacitor is electrically connected to the first end of the seventh capacitor; the second end of the seventh capacitor is electrically connected to the first end of the ninth resistor and the first end of the tenth resistor respectively; the second end of the ninth resistor is electrically connected to the input end of the integration processing circuit; the second end of the tenth resistor is grounded.

[0015] In some embodiments of the present invention, the feedback processing circuit includes a first feedback processing circuit and a second feedback processing circuit; the first feedback processing circuit includes a first feedback amplifier; the in-phase input terminal of the first feedback amplifier is electrically connected to the output terminal of the left channel signal of the left and right channel power amplifiers; the second feedback processing circuit includes a second feedback amplifier; the inverting input terminal of the second feedback amplifier is electrically connected to the output terminal of the right channel signal of the left and right channel power amplifiers.

[0016] In some embodiments of the present invention, the audio signal processor also includes a power supply unit, which includes a power supply circuit and a power supply; the power supply circuit is electrically connected to the positive power supply terminal and the negative power supply terminal of the audio balance circuit, the positive power supply terminal and the negative power supply terminal of the differential processing circuit, and the positive power supply terminal and the negative power supply terminal of the feedback processing circuit.

[0017] In a second aspect, the utility model provides an audio system, including a left and right channel balanced amplifier, a left and right channel signal pre-board, a left and right channel power amplifier, a pickup and a speaker; the audio system also includes the audio signal processor described in the above-mentioned embodiment.

[0018] According to the audio signal processor of the utility model, at least the following beneficial effects are achieved: the audio signal processor provided by the utility model synthesizes the audio signal to be played and the ambient sound collected by the pickup through the signal input unit, and then processes it through the high-pass filter, differential circuit and integral circuit, so that the audio actually played can be adjusted according to the feedback of the ambient audio, so that the audio equipped with the audio signal processor can be used in any scene. In addition, the relevant circuit of the processor can also eliminate high-frequency self-excitation, thereby protecting the tweeter and the eardrum of the human ear. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0020] Figure 1 The present invention is a schematic block diagram of an audio signal processor and a sound system according to an embodiment of the present invention.

[0021] Figure 2 A schematic block diagram of signal processing in an embodiment of the utility model;

[0022] Figure 3 This is a schematic diagram of a first signal input unit according to an embodiment of the present utility model;

[0023] Figure 4 This is a schematic diagram of a second signal input unit according to an embodiment of the present utility model;

[0024] Figure 5 This is a schematic diagram of a first processing unit according to an embodiment of the present utility model;

[0025] Figure 6 This is a schematic diagram of a second processing unit according to an embodiment of the present utility model;

[0026] Figure 7 It is a schematic diagram of an integral processing circuit according to an embodiment of the utility model;

[0027] Figure 8 is a schematic diagram of a first feedback processing circuit according to an embodiment of the present utility model;

[0028] Fig. 9 is a schematic diagram of a second feedback processing circuit according to an embodiment of the present utility model;

[0029] Fig.10 It is a schematic diagram of a power supply unit and a decoupling filter circuit according to an embodiment of the utility model;

[0030] Fig.11 This is one of the structural schematic diagrams of the sound system of an embodiment of the utility model;

[0031] Fig.12This is the second structural diagram of the sound system according to the embodiment of the utility model.

[0032] Figure numerals: left and right channel balanced amplifier 1, left and right channel signal pre-board 2, left and right channel power amplifier 3, pickup 4, audio signal processor 5, first signal input unit 110, first audio balance circuit 111, second signal input unit 120, second audio balance circuit 121, signal synthesis circuit 130, first differential processing circuit 210, second differential processing circuit 220, first high-pass filter 230, integration processing circuit 300, second high-pass filter 310, first feedback processing circuit 410, second feedback processing circuit 420, power supply unit 500. DETAILED DESCRIPTION

[0033] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0034] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0035] In the description of the present utility model, "several" means one or more, "more" means two or more, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of the first, second or third, it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0036] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0037] The audio signal processor provided by the utility model synthesizes the audio signal to be played and the ambient sound collected by the pickup through the signal input unit, and then processes it through the high-pass filter, differential circuit and integral circuit, so that the audio actually played can be adjusted according to the feedback of the ambient audio, so that the sound equipped with the audio signal processor can be used in any scene. In addition, the relevant circuit of the processor can also eliminate high-frequency self-excitation, so as to achieve the effect of protecting the tweeter and the eardrum of the human ear.

[0038] The concepts mentioned in this utility model are explained below:

[0039] Left channel, right channel: Two independent channels in an audio system used to simulate a stereo source in a sound system.

[0040] The specific device of the embodiment of the utility model is described below in conjunction with the accompanying drawings.

[0041] Reference Figures 1 to 9 , Figure 1 This is a schematic block diagram of an audio signal processor 5 and an audio system of an embodiment of the utility model. The audio system includes a left and right channel balanced amplifier 1, a left and right channel signal pre-panel 2, a left and right channel power amplifier 3, a pickup 4 and a speaker. The processor includes:

[0042] The signal input unit includes an audio balance circuit and a signal synthesis circuit 130; the input end of the audio balance circuit is electrically connected to the output end of the left and right channel balanced amplifier 1; the input end of the signal synthesis circuit 130 is electrically connected to the output end of the audio balance circuit and the output end of the pickup 4 respectively; the signal synthesis circuit 130 is used to synthesize the signal output by the audio balance circuit and the signal collected by the pickup 4;

[0043] The first processing unit includes a differential processing circuit and a first high-pass filter 230; the input end of the first high-pass filter 230 is electrically connected to the output end of the signal synthesis circuit 130; the output end of the first high-pass filter 230 is electrically connected to the input end of the differential processing circuit; the output end of the differential processing circuit is electrically connected to the input end of the left and right channel signal pre-plate 2

[0044] The second processing unit includes an integral processing circuit 300 and a second high-pass filter 310; the input end of the second high-pass filter 310 is electrically connected to the output end of the left and right channel signal pre-plate 2; the output end of the second high-pass filter 310 is electrically connected to the input end of the integral processing circuit 300;

[0045] Feedback processing circuit, the feedback end of the feedback processing circuit is electrically connected to the output end of the integration processing circuit 300; the input end of the feedback processing circuit is electrically connected to the output end of the left and right channel power amplifier 3; the output end of the left and right channel power amplifier 3 is also electrically connected to the speaker.

[0046] It should be noted that the audio signal processor 5 provided in the embodiment of the utility model is used to process the audio signal of the sound system. The following is a description of the processing flow of the audio signal in conjunction with the accompanying drawings. Figure 3 , Figure 4 As shown, the signal input unit is used to receive the audio signal transmitted by the left and right channel balanced amplifier 1. The left and right channel balanced amplifier 1 is an audio processing circuit in the sound system, which is used to adjust the volume balance of the left and right channels; after the left and right channel audio signals transmitted by the left and right channel balanced amplifier 1 are transmitted to the signal input unit, the signal input unit further balances the left and right channel signals through the audio balance circuit; in one embodiment of the utility model, the audio balance circuit adopts the LM833 amplifier, and the audio balance circuit can also adopt other types of operational amplifier circuits to process the left and right channel audio signals, and the utility model does not limit this. Further, the audio balance circuit transmits the processed left and right channel balanced signals to the signal synthesis circuit 130. At the same time, the signal synthesis circuit 130 also receives the ambient audio signal transmitted by the pickup 4, and synthesizes the left and right channel balanced signals and the ambient audio signal into a single signal (hereinafter referred to as the first signal), and transmits it to the post-processing circuit. Therefore, the audio signal processor 5 provided in the embodiment of the utility model can be based on the ambient audio collected by the pickup 4, and the left and right channel sound sources of the original audio signal to be played are integrated, and the sound quality of the left and right channel sources is adjusted according to the ambient audio. Further, the first processing unit refers to Figure 5 , Figure 6 , the signal synthesis circuit 130 transmits the synthesized first signal to the first processing unit. The first processing unit first filters out interference signals such as low-frequency noise and low-frequency murmurs through the first high-pass filter 230, and then performs differential processing on the first signal through the differential processing circuit to enhance the high-frequency part of the audio signal and emphasize the edge changes of the audio signal, so that the relatively high-pitched and sharp audio in the audio signal is clearer. This part of the processing belongs to the first level of processing of the synthesized audio signal by the audio signal processing of the utility model. Further, after the first level of processing, the first processing unit transmits the first signal to the left and right channel signal pre-board 2 for processing. The left and right channel signal pre-board 2 can perform tuning control on the audio signal. Further, after processing the first signal, the left and right channel signal pre-board 2 transmits the signal to the second processing unit. The second processing unit includes a second high-pass filter 310 and an integral processing circuit 300. The second high-pass filter 310 and the integral processing circuit 300 refer to Figure 7The second high-pass filter 310 filters out the low-frequency noise and other interferences generated during the tuning process of the left and right channel signals on the front panel. The integral processing circuit 300 enhances the low-frequency part and the relatively low-sounding part of the first signal to make the bass of the audio signal clearer. This part of the processing belongs to the second-level processing of the synthesized audio signal by the audio signal processing of the utility model. The second signal is used below to refer to the first signal that has undergone the second-level processing. Further, the input end of the feedback processing circuit is connected to the output end of the left and right channel power amplifier 3, and the feedback end of the feedback processing circuit is electrically connected to the output end of the integral processing circuit 300. The feedback processing circuit adjusts the signal output by the left and right channel power amplifier 3 according to the feedback of the second signal. This feedback processing is the third-level processing of the audio signal. Furthermore, the left and right channel power amplifiers 3 play the role of signal amplification and sound in the audio system. The input ends of the left and right channel power amplifiers 3 are usually electrically connected to the output ends of the left and right channel signal pre-boards 2. Therefore, the left and right channel power amplifiers 3 first process the audio signal (the first signal at this time) transmitted by the left and right channel signal pre-boards 2, and then feedback-adjust the audio signal according to the above-mentioned third-level processing (i.e., feedback adjustment of the second signal). The adjusted audio signal (hereinafter referred to as the third signal) is transmitted to the speaker output. This is the entire signal processing process of the audio signal processor 5 provided in the embodiment of the utility model. In general, the audio signal processor 5 provided in the embodiment of the utility model first processes the original audio signal to be played into a left and right channel balanced signal through a signal input unit, and then the left and right channel balanced signal and the ambient audio collected by the pickup 4 are collectively referred to as a first signal, and then the first signal is processed by the first stage and the second stage to obtain a second signal, and finally the first signal processed by the first stage and the second signal processed by the third stage feedback are synthesized to obtain an audio signal output by the final speaker. In this process, the original audio signal is adjusted and synthesized according to the ambient audio, and the audio signal adapted to the current environment is finally played by the speaker. The signal processing schematic block diagram is shown as follows: Figure 2 shown.

[0047] Reference Figure 3-4In some embodiments of the utility model, the signal input unit includes a first signal input unit 110 and a second signal input unit 120; the input end of the first audio balance circuit 111 of the first signal input unit 110 is electrically connected to the left channel signal output end of the left and right channel balanced amplifier 1, the output end of the first audio balance circuit 111 is electrically connected to the input end of the first signal synthesis circuit of the first signal input unit 110, and the output end of the first signal synthesis circuit is electrically connected to the first high-pass filter 230; the second audio balance circuit 121 of the second signal input unit 120 is electrically connected to the right channel signal output end of the left and right channel balanced amplifier 1, the output end of the second audio balance circuit 121 is electrically connected to the input end of the second signal synthesis circuit of the second signal input unit 120, and the output end of the second signal synthesis circuit is electrically connected to the first high-pass filter 230.

[0048] It should be noted that, since the audio signal in the sound system is divided into a left channel signal and a right channel signal, the feedback processing circuit of the left channel signal and the right channel signal needs to be processed accordingly according to the left channel signal and the right channel signal. The embodiment of the utility model sets a first signal input unit 110 and a second signal input unit 120 to process the left channel signal and the right channel signal respectively. In addition, in the embodiment of the utility model, the first audio balance circuit 111 and the second audio balance circuit 121 both use LM833 amplifiers, and the audio balance circuit can also use other types of operational amplifier circuits to process the left and right channel audio signals, and the utility model does not limit this; in addition, in the embodiment of the utility model, the specific structures of the first signal synthesis circuit and the second signal synthesis circuit are the same, so the signal synthesis circuit 130 is used in the embodiment of the utility model.

[0049] Reference Figure 3-4 In some embodiments of the utility model, the signal synthesis circuit 130 includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first capacitor and a second capacitor; the output end of the pickup 4 is electrically connected to the first end of the first resistor and the first end of the second resistor respectively; the second end of the first resistor is electrically connected to the first end of the first capacitor and is grounded, the second end of the first capacitor is electrically connected to the output end of the audio balance circuit, and the second end of the first capacitor is also electrically connected to the first end of the third resistor; the first end of the second resistor is electrically connected to the first end of the third resistor and the first end of the second capacitor respectively; the second end of the third resistor is electrically connected to the first end of the fourth resistor; the second end of the fourth resistor is electrically connected to the input end of the first high-pass filter 230; the second end of the second capacitor is electrically connected to the first end of the fifth resistor, and the second end of the fifth resistor is electrically connected to the input end of the first high-pass filter 230.

[0050] It should be noted that the signal synthesis circuit 130 provided in an embodiment of the present invention is used to synthesize the output signal of the audio balance circuit and the ambient audio collected by the pickup 4; the signal synthesis circuit 130 also has a filtering function and can perform preliminary filtering processing on the synthesized first signal.

[0051] Reference Figure 5-6 In some embodiments of the present invention, the differential processing circuit includes a first differential processing circuit 210 and a second differential processing circuit 220; the non-inverting input terminal of the first differential processing circuit 210 is electrically connected to the output terminal of the first high-pass filter 230, and the inverting input terminal of the second differential processing circuit 220 is electrically connected to the output terminal of the first high-pass filter 230.

[0052] It should be noted that, in some embodiments of the present invention, the first differential processing circuit 210 is electrically connected to the above-mentioned first signal input unit 110 for differential processing of the left channel signal; the second differential processing circuit 220 is electrically connected to the above-mentioned second signal input unit 120 for differential processing of the right channel signal.

[0053] Reference Figure 7 In some embodiments of the utility model, the integration processing circuit 300 includes a sixth resistor, a third capacitor and a fourth capacitor; the first end of the sixth resistor is electrically connected to the output end of the second high-pass filter 310, and the second end of the sixth resistor is respectively connected to the first end of the third capacitor and the first end of the fourth capacitor; the second end of the third capacitor and the second end of the fourth capacitor are both grounded.

[0054] It should be noted that the integral processing circuit 300 enhances the low-frequency part and the relatively low-sounding part of the first signal to make the bass sound quality of the audio signal clearer. In addition, the structure of the integral processing circuit 300 for processing the left channel signal and the right channel signal in the embodiment of the utility model is the same.

[0055] Reference Figure 5-6 In some embodiments of the utility model, the first high-pass filter 230 includes a seventh resistor, an eighth resistor and a fifth capacitor; the first end of the seventh resistor is electrically connected to the output end of the signal synthesis circuit 130, and the second end of the seventh resistor is electrically connected to the first end of the eighth resistor and the first end of the fifth capacitor respectively; the second end of the eighth resistor is grounded; the second end of the fifth capacitor is electrically connected to the input end of the differential processing circuit.

[0056] It should be noted that the first high-pass filter 230 is used to filter out interference signals such as low-frequency noise and low-frequency murmurs. It is understandable that the structure of the first high-pass filter 230 is only one embodiment of the present invention, and the specific structure of the first high-pass filter 230 can be adjusted accordingly according to requirements.

[0057] Reference Figure 7 In some embodiments of the utility model, the second high-pass filter 310 includes a sixth capacitor, a seventh capacitor, a ninth resistor and a tenth resistor; the first end of the sixth capacitor is electrically connected to the output end of the left and right channel signal pre-plate 2, and the second end of the sixth capacitor is electrically connected to the first end of the seventh capacitor; the second end of the seventh capacitor is electrically connected to the first end of the ninth resistor and the first end of the tenth resistor respectively; the second end of the ninth resistor is electrically connected to the input end of the integration processing circuit 300; the second end of the tenth resistor is grounded.

[0058] It should be noted that the second high-pass filter 310 is used to filter out interference such as low-frequency noise generated during the tuning process of the left and right channel signals on the front panel. It can be understood that the structure of the second high-pass filter 310 is only one embodiment of the present invention, and the specific structure of the second high-pass filter 310 can be adjusted accordingly according to needs.

[0059] Reference Figure 8-Figure 9 In some embodiments of the utility model, the feedback processing circuit includes a first feedback processing circuit 410 and a second feedback processing circuit 420; the first feedback processing circuit 410 includes a first feedback amplifier; the in-phase input terminal of the first feedback amplifier is electrically connected to the output terminal of the left channel signal of the left and right channel power amplifier 3; the second feedback processing circuit 420 includes a second feedback amplifier; the inverting input terminal of the second feedback amplifier is electrically connected to the output terminal of the right channel signal of the left and right channel power amplifier 3.

[0060] It should be noted that the feedback processing circuit of the left channel signal and the right channel signal needs to perform corresponding processing according to the left channel signal and the right channel signal. Therefore, the in-phase input terminal of the first feedback amplifier is electrically connected to the output terminal of the left channel signal of the left and right channel power amplifier 3, and the in-phase input terminal of the second feedback amplifier is electrically connected to the output terminal of the right channel signal of the left and right channel power amplifier 3.

[0061] Reference Fig.10 In some embodiments of the utility model, the audio signal processor 5 also includes a power supply unit 500, which includes a power supply circuit and a power supply; the power supply circuit is electrically connected to the positive power supply terminal and the negative power supply terminal of the audio balance circuit, the positive power supply terminal and the negative power supply terminal of the differential processing circuit, and the positive power supply terminal and the negative power supply terminal of the feedback processing circuit.

[0062] It should be noted that, according to an embodiment of the utility model, the specific structure of the power supply unit 500 also includes a decoupling filter circuit; the decoupling filter circuit includes a positive resistor, a negative resistor, a positive capacitor and a negative capacitor; the first end of the positive resistor is electrically connected to the positive electrode of the power supply, and the second end of the positive resistor is electrically connected to the positive power supply end of the audio balance circuit or the positive power supply end of the differential processing circuit or the positive power supply end of the feedback processing circuit; the second end of the positive resistor is also electrically connected to the first end of the positive capacitor, and the second end of the positive capacitor is grounded; the first end of the negative resistor is electrically connected to the negative electrode of the power supply, and the second end of the negative resistor is electrically connected to the negative power supply end of the audio balance circuit or the negative power supply end of the differential processing circuit or the negative power supply end of the feedback processing circuit; the second end of the negative resistor is also electrically connected to the first end of the negative capacitor, and the second end of the negative capacitor is grounded. The power supply unit 500 is used to power the amplifier IC of the audio balance circuit, the differential processing circuit and the feedback processing circuit, and can filter out signal interference such as ripple of the external power supply through the decoupling filter circuit.

[0063] Reference Figure 1 , Figure 11-12 The embodiment of the utility model also provides an audio system, including a left and right channel balanced amplifier 1, a left and right channel signal pre-panel 2, a left and right channel power amplifier 3, a pickup 4 and a speaker; the audio system also includes an audio signal processor 5 of the above-mentioned embodiment.

[0064] It should be noted that Figure 11-12 This is a schematic diagram of the structure of the sound system provided in an embodiment of the utility model. The left and right channel balanced amplifier 1, the left and right channel signal pre-panel 2, the left and right channel power amplifier 3, the pickup 4 and the speaker (the specific structure is not shown in the figure) in the sound system of the embodiment of the utility model can adopt any type of device, and the utility model does not impose any limitation on this.

[0065] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. An audio signal processor, characterized in that: Applied to an audio system, the audio system includes a left and right channel balanced amplifier, a left and right channel signal pre-panel, a left and right channel power amplifier, a pickup and a speaker, and the processor includes: The signal input unit comprises an audio balance circuit and a signal synthesis circuit; the input end of the audio balance circuit is electrically connected to the output end of the left and right channel balanced amplifier; the input end of the signal synthesis circuit is electrically connected to the output end of the audio balance circuit and the output end of the pickup respectively; the signal synthesis circuit is used to synthesize the signal output by the audio balance circuit and the signal collected by the pickup; A first processing unit includes a differential processing circuit and a first high-pass filter; an input end of the first high-pass filter is electrically connected to an output end of the signal synthesis circuit; an output end of the first high-pass filter is electrically connected to an input end of the differential processing circuit; and an output end of the differential processing circuit is electrically connected to an input end of the left and right channel signal pre-plate; The second processing unit includes an integral processing circuit and a second high-pass filter; the input end of the second high-pass filter is electrically connected to the output end of the left and right channel signal pre-plate; the output end of the second high-pass filter is electrically connected to the input end of the integral processing circuit; A feedback processing circuit, wherein the feedback end of the feedback processing circuit is electrically connected to the output end of the integration processing circuit; the input end of the feedback processing circuit is electrically connected to the output end of the left and right channel power amplifiers; and the output end of the left and right channel power amplifiers is also electrically connected to the speaker.

2. The audio signal processor according to claim 1, characterized in that: The signal input unit includes a first signal input unit and a second signal input unit; the input end of the first audio balance circuit of the first signal input unit is electrically connected to the left channel signal output end of the left and right channel balanced amplifier, the output end of the first audio balance circuit is electrically connected to the input end of the first signal synthesis circuit of the first signal input unit, and the output end of the first signal synthesis circuit is electrically connected to the first high-pass filter; the second audio balance circuit of the second signal input unit is electrically connected to the right channel signal output end of the left and right channel balanced amplifier, the output end of the second audio balance circuit is electrically connected to the input end of the second signal synthesis circuit of the second signal input unit, and the output end of the second signal synthesis circuit is electrically connected to the first high-pass filter.

3. The audio signal processor according to claim 1, characterized in that: The signal synthesis circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first capacitor and a second capacitor; the output end of the pickup is electrically connected to the first end of the first resistor and the first end of the second resistor respectively; the second end of the first resistor is electrically connected to the first end of the first capacitor and is grounded, the second end of the first capacitor is electrically connected to the output end of the audio balance circuit, and the second end of the first capacitor is also electrically connected to the first end of the third resistor; the first end of the second resistor is electrically connected to the first end of the third resistor and the first end of the second capacitor respectively; the second end of the third resistor is electrically connected to the first end of the fourth resistor; the second end of the fourth resistor is electrically connected to the input end of the first high-pass filter; the second end of the second capacitor is electrically connected to the first end of the fifth resistor, and the second end of the fifth resistor is electrically connected to the input end of the first high-pass filter.

4. The audio signal processor according to claim 1, characterized in that: The differential processing circuit includes a first differential processing circuit and a second differential processing circuit; the non-inverting input terminal of the first differential processing circuit is electrically connected to the output terminal of the first high-pass filter, and the inverting input terminal of the second differential processing circuit is electrically connected to the output terminal of the first high-pass filter.

5. The audio signal processor according to claim 1, characterized in that: The integration processing circuit includes a sixth resistor, a third capacitor and a fourth capacitor; the first end of the sixth resistor is electrically connected to the output end of the second high-pass filter, and the second end of the sixth resistor is respectively connected to the first end of the third capacitor and the first end of the fourth capacitor; the second end of the third capacitor and the second end of the fourth capacitor are both grounded.

6. The audio signal processor according to claim 1, characterized in that: The first high-pass filter includes a seventh resistor, an eighth resistor and a fifth capacitor; the first end of the seventh resistor is electrically connected to the output end of the signal synthesis circuit, and the second end of the seventh resistor is electrically connected to the first end of the eighth resistor and the first end of the fifth capacitor respectively; the second end of the eighth resistor is grounded; the second end of the fifth capacitor is electrically connected to the input end of the differential processing circuit.

7. The audio signal processor according to claim 1, characterized in that: The second high-pass filter includes a sixth capacitor, a seventh capacitor, a ninth resistor and a tenth resistor; the first end of the sixth capacitor is electrically connected to the output end of the left and right channel signal pre-plate, and the second end of the sixth capacitor is electrically connected to the first end of the seventh capacitor; the second end of the seventh capacitor is electrically connected to the first end of the ninth resistor and the first end of the tenth resistor respectively; the second end of the ninth resistor is electrically connected to the input end of the integration processing circuit; the second end of the tenth resistor is grounded.

8. The audio signal processor according to claim 1, characterized in that: The feedback processing circuit includes a first feedback processing circuit and a second feedback processing circuit; the first feedback processing circuit includes a first feedback amplifier; the in-phase input terminal of the first feedback amplifier is electrically connected to the output terminal of the left channel signal of the left and right channel power amplifiers; the second feedback processing circuit includes a second feedback amplifier; the inverting input terminal of the second feedback amplifier is electrically connected to the output terminal of the right channel signal of the left and right channel power amplifiers.

9. The audio signal processor according to claim 1, characterized in that: The audio signal processor also includes a power supply unit, which includes a power supply circuit and a power supply; the power supply circuit is electrically connected to the positive power supply terminal and the negative power supply terminal of the audio balance circuit, the positive power supply terminal and the negative power supply terminal of the differential processing circuit, and the positive power supply terminal and the negative power supply terminal of the feedback processing circuit.

10. A sound system, characterized in that: The audio system comprises a left and right channel balanced amplifier, a left and right channel signal pre-panel, a left and right channel power amplifier, a pickup and a speaker; the audio system also comprises an audio signal processor as described in any one of claims 1-9.

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