Sound equipment and control method thereof

Abstract

The invention discloses a sound equipment control method, the sound equipment is preset with a preset threshold range, and the method comprises the following steps: acquiring an input audio signal level in real time; determining a preset adjustment mode of the output audio signal level based on a comparison result of the input audio signal level and a preset threshold range; wherein if the input audio signal level is not in the preset threshold range, the preset adjustment mode is that the output audio signal level is smaller than the input audio signal level. According to the sound equipment control method, when the level of the input audio signal is low, the level of the output audio signal is smaller than the level of the input audio signal, current sound or white noise is not obvious even through amplification of hardware bottom noise, and when the level of the input audio signal is too high, the level of the input audio signal is higher than the preset threshold range, so that the level of the output audio signal is not obvious. The level of the output audio signal is smaller than the level of the input audio signal, so that the power amplifier module and the loudspeaker are not continuously in a high-load state, and sound distortion is avoided.

Description

Technical Field

[0001] This invention relates to the field of audio technology, specifically to an audio system and its control method. Background Technology

[0002] In the field of audio processing, controlling the dynamic range of signal levels has always been a key challenge. Existing technologies often take cost into consideration, as inexpensive materials cannot withstand the impact of large signals, nor can they eliminate the system noise floor associated with small signals.

[0003] Therefore, when the input audio signal level is low, due to the amplification effect of hardware noise floor, there will be obvious current noise or white noise, which will seriously affect the listening experience. On the other hand, when the audio signal level is too high, the system will force the power amplifier module and speakers to be under high load continuously in order to maintain linear output, which will lead to sound distortion (such as high frequency clipping). Summary of the Invention

[0004] In view of this, the present invention provides an audio system and its control method, which can avoid obvious current noise or white noise when the input audio signal level is low, and also avoid sound distortion when the input audio signal level is too high.

[0005] In a first aspect, the present invention provides a method for controlling an audio system, wherein the audio system has a preset threshold range, and the method includes: Real-time acquisition of input audio signal level; Based on the comparison between the input audio signal level and the preset threshold range, a preset adjustment method for the output audio signal level is determined; wherein, If the input audio signal level is not within the preset threshold range, the preset adjustment method is to make the output audio signal level lower than the input audio signal level.

[0006] The audio control method of this invention acquires the input audio signal level in real time. Since the audio system has a preset threshold range, the input audio signal level is compared with the preset threshold range. Based on the comparison result, a preset adjustment method for the output audio signal level is determined. If the input audio signal level is not within the preset threshold range, the preset adjustment method is to make the output audio signal level lower than the input audio signal level. Therefore, when the input audio signal level is low (below the preset threshold range), by making the output audio signal level lower than the input audio signal level, even with hardware noise amplification, current noise or white noise is not noticeable. Conversely, when the input audio signal level is high (above the preset threshold range), by making the output audio signal level lower than the input audio signal level, the power amplifier module and speaker will not be under high load, thus avoiding sound distortion.

[0007] In one embodiment, if the input audio signal level is not within a preset threshold range, the preset adjustment method is to make the output audio signal level lower than the input audio signal level, including: If the input audio signal level is greater than the upper limit of the preset threshold range, the preset adjustment method is to set the output audio level to the upper limit of the preset threshold range.

[0008] In one embodiment, if the input audio signal level is not within a preset threshold range, the preset adjustment method is to make the output audio signal level lower than the input audio signal level, including: If the input audio signal level is lower than the lower limit of the preset threshold range, the preset adjustment method is to obtain the first preset adjustment coefficient and calculate the output audio signal level according to the following formula: Where Pi is the input audio signal level; Po is the input audio signal level; K1 is the first preset adjustment coefficient, K1>1; b is the adjustment value.

[0009] In one embodiment, if the input audio signal level is not within a preset threshold range, the preset adjustment method is to make the output audio signal level lower than the input audio signal level, including: If the input audio signal level is less than the lower limit of the preset threshold range, then determine whether the speaker has a preset digital volume meter. If the audio system has a preset digital volume meter, the preset adjustment method is to cut off the output audio signal level. If the speaker has a preset digital volume meter, the preset adjustment method is to obtain the first preset adjustment coefficient and calculate the output audio signal level according to the following formula: Where Pi is the input audio signal level; Po is the input audio signal level; K1 is the first preset adjustment coefficient, K1>1; b is the adjustment value.

[0010] In one embodiment, the method further includes: In debug mode, the input audio signal level is gradually reduced below the lower limit of the preset threshold range, and the first preset adjustment coefficient is increased when current noise or white noise occurs. Stores the first preset adjustment factor when reducing the input audio signal level will not produce current noise or white noise.

[0011] In one embodiment, a preset adjustment method for the output audio signal level is determined based on a comparison between the input audio signal level and a preset threshold range, including: If the input audio signal level is within the preset threshold range, the preset adjustment method is to make the output audio signal level greater than or equal to the input audio signal level.

[0012] In one embodiment, a preset adjustment method for the output audio signal level is determined based on a comparison between the input audio signal level and a preset threshold range, including: If the input audio signal level is within the preset threshold range and is at the upper limit of the preset threshold range, the preset adjustment method is to make the output audio signal level equal to the input audio signal level. If the input audio signal level is within the preset threshold range but not the upper limit of the preset threshold range, the preset adjustment method is to make the output audio signal level greater than the input audio signal level.

[0013] In one embodiment, a preset adjustment method for the output audio signal level is determined based on a comparison between the input audio signal level and a preset threshold range, including: If the input audio signal level is within the preset threshold range, the preset adjustment method is to obtain the second preset adjustment coefficient and calculate the output audio signal level according to the following formula: Where Pi is the input audio signal level; Po is the input audio signal level; K2 is the first preset adjustment coefficient, 0.9 < K2 < 1; b is the adjustment value.

[0014] In one embodiment, the method further includes: In debug mode, adjust the input audio signal level within a preset threshold range, and reduce the second preset adjustment coefficient when current noise or white noise occurs; Store a second preset adjustment factor when reducing the input audio signal level will not produce current noise or white noise.

[0015] In one embodiment, the upper limit of the preset threshold range is -6dB, and the lower limit of the preset threshold range is -60dB.

[0016] Secondly, an audio system is also provided, including a memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, and the processor executing the computer instructions to perform the audio control method of the preceding embodiment.

[0017] The speaker of this invention, by executing the speaker control method of any of the preceding embodiments, acquires the input audio signal level in real time. Since the speaker has a preset threshold range, the input audio signal level is compared with the preset threshold range. Based on the comparison result, a preset adjustment method for the output audio signal level is determined. If the input audio signal level is not within the preset threshold range, the preset adjustment method is to make the output audio signal level lower than the input audio signal level. Therefore, when the input audio signal level is low (below the preset threshold range), by making the output audio signal level lower than the input audio signal level, even with hardware noise amplification, current noise or white noise is not noticeable. Conversely, when the input audio signal level is too high (above the preset threshold range), by making the output audio signal level lower than the input audio signal level, the power amplifier module and speaker will not be under high load, thus avoiding sound distortion. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a flowchart illustrating a method for controlling an audio system according to an embodiment of the present invention; Figure 2 This is a measured graph showing how the output audio signal level changes with the input audio signal level in accordance with existing technology and an embodiment of the present invention.

[0020] Figure 3 This is an internal structural diagram of a computer device for audio equipment according to an embodiment of this application. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] refer to Figure 2 The blue line represents a measured graph showing the output audio signal level changing with the input audio signal level in existing technology. The output audio signal level and input audio signal level maintain a linear relationship. Therefore, when the input audio signal level is low, for example... Figure 2 At levels below -60dB, the amplification effect of hardware noise floor will result in noticeable current noise or white noise, severely impacting the listening experience. On the other hand, when the audio signal level is above -6dB, the system will force the power amplifier module and speakers to operate under high load to maintain linear output. This not only leads to sound distortion but may also cause hardware overheating and aging over time, shortening the equipment's lifespan.

[0023] According to an embodiment of the present invention, an embodiment of a sound control method is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0024] The following is combined with Figure 1-2 The following describes embodiments of the present invention.

[0025] According to embodiments of the present invention, such as Figure 1 As shown, on the one hand, a method for controlling an audio system is provided, the method including: Step S100: Real-time acquisition of input audio signal level; Step S200: Based on the comparison result between the input audio signal level and the preset threshold range, determine the preset adjustment method of the output audio signal level.

[0026] Specifically, if the input audio signal level is not within the preset threshold range, the preset adjustment method is to make the output audio signal level lower than the input audio signal level.

[0027] In this embodiment, the input audio signal level is acquired in real time. Since the speaker has a preset threshold range, the input audio signal level is compared with the preset threshold range. Based on the comparison result, a preset adjustment method for the output audio signal level is determined. If the input audio signal level is not within the preset threshold range, the preset adjustment method is to make the output audio signal level lower than the input audio signal level. Therefore, when the input audio signal level is low (below the preset threshold range), by making the output audio signal level lower than the input audio signal level, even with hardware noise amplification, current noise or white noise is not noticeable. Conversely, when the input audio signal level is high (above the preset threshold range), by making the output audio signal level lower than the input audio signal level, the power amplifier module and speaker will not be under high load, thus avoiding sound distortion.

[0028] It should be noted that the reference Figure 2The red line represents the measured change in output audio signal level as the input audio signal level changes in this embodiment. When the input audio signal level is within a preset threshold range (e.g., ...), ... Figure 2 When the input audio signal level is between 6dB and 60dB, the input audio signal level and the output audio signal level exhibit a first linear relationship of equality; when the input audio signal level is less than a preset threshold range (e.g., 6dB-60dB), the output audio signal level exhibits a second linear relationship of equality. Figure 2 When the input audio signal level is between 6dB and 60dB, the output audio signal level exhibits a second linear relationship with the input audio signal level. In this second linear relationship, the output audio signal level is lower than the input audio signal level, thus avoiding noticeable current noise or white noise. When the input audio signal level exceeds a preset threshold range (e.g., ...), ... Figure 2 When the input audio signal level is between -6dB and 60dB, the output audio signal level is always maintained at the upper limit of the preset threshold range (-6dB), which is lower than the input audio signal level. The power amplifier module and speaker will not be under high load, thus avoiding sound distortion.

[0029] In one embodiment, step S200 includes: Step S210: If the input audio signal level is greater than the upper limit of the preset threshold range, the preset adjustment method is to set the output audio level to the upper limit of the preset threshold range.

[0030] In this embodiment, the output audio signal level is always maintained at the upper limit of the preset threshold range, which is lower than the input audio signal level. The power amplifier module and speaker will not be under high load, thus avoiding sound distortion and helping to prevent hardware overheating and aging, increasing the lifespan of the device.

[0031] In one embodiment, step S200 includes: Step S220: In one embodiment, if the input audio signal level is not within a preset threshold range, the preset adjustment method is to make the output audio signal level lower than the input audio signal level, including: If the input audio signal level is lower than the lower limit of the preset threshold range, the preset adjustment method is to obtain the first preset adjustment coefficient and calculate the output audio signal level according to the following formula: Where Pi is the input audio signal level; Po is the input audio signal level; K1 is the first preset adjustment coefficient, K1>1; b is the adjustment value.

[0032] In this embodiment, when the input audio signal level is less than a preset threshold range, the input audio signal level and the output audio signal have a second linear relationship, in which the output audio signal level is less than the input audio signal level, thereby avoiding obvious current noise or white noise.

[0033] It should be noted that the adaptive adjustment value is adjusted based on the output audio signal level corresponding to the lower limit of the preset threshold range when the input audio signal level is at the lower limit. Specifically, by substituting the value of the first preset adjustment coefficient K1 and the endpoint (the output audio signal level corresponding to the lower limit of the preset threshold range) into the above formula, the adaptive adjustment value b can be directly obtained.

[0034] In one embodiment, step S200 includes: If the input audio signal level is less than the lower limit of the preset threshold range, then it is determined whether the speaker has a preset digital volume meter. If the audio system has a preset digital volume meter, then the preset adjustment method is to cut off the output audio signal level; If the speaker has a preset digital volume meter, the preset adjustment method is to obtain a first preset adjustment coefficient and calculate the output audio signal level according to the following formula: Among them, P i Input audio signal level; P o Input audio signal level; K1 is the first preset adjustment coefficient, K1>1; b is the adjustment value.

[0035] In this embodiment, if the audio system has a preset digital volume meter, cutting off the output audio signal level can effectively suppress the messy signal where noise and signal are mixed together when the signal is low. This is also a more effective improvement measure for audio systems with poor performance (preset digital volume meter).

[0036] Furthermore, the first preset adjustment coefficient obtains a reasonable value through the following steps: In debug mode, the input audio signal level is gradually reduced below the lower limit of the preset threshold range, and the first preset adjustment coefficient is increased when current noise or white noise occurs. Stores the first preset adjustment factor when reducing the input audio signal level will not produce current noise or white noise.

[0037] In one embodiment, step S200 includes: If the input audio signal level is within a preset threshold range, the preset adjustment method is to make the output audio signal level greater than or equal to the input audio signal level.

[0038] In this embodiment, by outputting an audio signal level greater than the input amplitude audio signal level within a preset threshold range, we further enhance the signal amplitude within the effective range (preset threshold range). By compressing the dynamic range of the audio signal, we achieve the effect of increasing the perceived volume under the same power conditions.

[0039] Furthermore, if the input audio signal level is within a preset threshold range and is the upper limit of the preset threshold range, then the preset adjustment method is to make the output audio signal level equal to the input audio signal level; If the input audio signal level is within a preset threshold range but not at the upper limit of the preset threshold range, then the preset adjustment method is to make the output audio signal level greater than the input audio signal level.

[0040] Further, determining the preset adjustment method for the output audio signal level based on the comparison result between the input audio signal level and the preset threshold range includes: If the input audio signal level is within a preset threshold range, the preset adjustment method is to obtain a second preset adjustment coefficient and calculate the output audio signal level according to the following formula: Among them, P i Input audio signal level; P o Input audio signal level; K2 is the first preset adjustment coefficient, 0.9 < K2 < 1; b is the adjustment value.

[0041] In this embodiment, when the input audio signal level is within a preset threshold range, the input audio signal level and the output audio signal have a third linear relationship. In this third linear relationship, the output audio signal level is greater than the input audio signal level, thereby further increasing the signal amplitude in the effective range (preset threshold range). By compressing the dynamic range of the audio signal, the effect of increasing the perceived volume under the same power condition is achieved.

[0042] It should be noted that the adaptive adjustment value is adjusted based on the output audio signal level corresponding to the upper limit of the preset threshold range when the input audio signal level is at the upper limit of the preset threshold range. Specifically, by substituting the value of the second preset adjustment coefficient K2 and the endpoint (the output audio signal level corresponding to the upper limit of the preset threshold range) into the above formula, the adaptive adjustment value b can be directly obtained.

[0043] Furthermore, the second preset adjustment coefficient obtains a reasonable value through the following steps: In debug mode, the input audio signal level is adjusted within a preset threshold range, and the second preset adjustment coefficient is reduced when current noise or white noise occurs. Store a second preset adjustment factor when reducing the input audio signal level will not produce current noise or white noise.

[0044] In one embodiment, the upper limit of the preset threshold range in step S200 is -6dB, and the lower limit of the preset threshold range is -60dB. This preset threshold range is a preferred range, which is more effective when the output audio signal level is greater than -6dB, and when the output audio signal level is less than -60dB, obvious current noise or white noise is likely to occur.

[0045] In one embodiment, such as Figure 3 As shown, Figure 3 This is an internal structural diagram of a computer device for audio equipment provided in an optional embodiment of the present invention, such as... Figure 3 As shown, the computer device for the audio system includes a control module, which comprises one or more processors 10, a memory 20, and interfaces for connecting the various components, including high-speed interfaces and low-speed interfaces. The various components communicate with each other via different buses and can be mounted on a common motherboard or otherwise installed as needed. The processor can process instructions executed within the audio system to perform the audio control method described in any of the above embodiments. This includes instructions stored in or on the memory for displaying graphical information of a GUI on an external input / output device (such as a display device coupled to the interface).

[0046] In some alternative implementations, multiple processors and / or multiple buses can be used with multiple memories and multiple storage devices, if desired. Similarly, multiple speakers can be connected, with each device providing some of the necessary operations (e.g., as a server array, a set of blade servers, or a multiprocessor system). Figure 3 Take a processor 10 as an example.

[0047] Processor 10 may be a central processing unit, a network processor, or a combination thereof. Processor 10 may further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof. The programmable logic device may be a complex programmable logic device (CAMP), a field-programmable gate array (FPGA), a general-purpose array logic (GDA), or any combination thereof.

[0048] The memory 20 stores instructions executable by at least one processor 10 to cause at least one processor 10 to perform the method shown in the above embodiments.

[0049] The memory 20 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created based on the use of the audio system. Furthermore, the memory 20 may include high-speed random access memory and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some alternative embodiments, the memory 20 may optionally include memory remotely located relative to the processor 10, which can be connected to the audio system via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0050] The memory 20 may include volatile memory, such as random access memory; the memory may also include non-volatile memory, such as flash memory, hard disk or solid-state drive; the memory 20 may also include a combination of the above types of memory.

[0051] The speaker also includes a communication interface 30 for communicating with other devices or communication networks.

[0052] The speaker provided in this embodiment acquires the input audio signal level in real time by executing the speaker control method of any of the previous embodiments. Since the speaker has a preset threshold range, the input audio signal level is compared with the preset threshold range. Based on the comparison result, a preset adjustment method for the output audio signal level is determined. If the input audio signal level is not within the preset threshold range, the preset adjustment method is to make the output audio signal level lower than the input audio signal level. Therefore, when the input audio signal level is low, it will be below the preset threshold range. By making the output audio signal level lower than the input audio signal level, even with hardware noise amplification, current noise or white noise is not noticeable. Conversely, when the input audio signal level is too high, it will be above the preset threshold range. By making the output audio signal level lower than the input audio signal level, the power amplifier module and speaker will not be continuously under high load, avoiding hardware overheating and aging, and increasing the lifespan of the device.

[0053] This invention also provides a computer-readable storage medium. The methods described above according to embodiments of the invention can be implemented in hardware or firmware, or implemented as recordable on a storage medium, or implemented as computer code originally stored on a remote storage medium or a non-transitory machine-readable storage medium and subsequently stored on a local storage medium after being downloaded via a network. Thus, the methods described herein can be processed by software stored on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. The storage medium can be a magnetic disk, optical disk, read-only memory, random access memory, flash memory, hard disk, or solid-state drive, etc.; further, the storage medium may also include combinations of the above types of memory. It is understood that computers, processors, microprocessors, or programmable hardware include storage components capable of storing or receiving software or computer code, which, when accessed and executed by the computer, processor, or hardware, implements the methods shown in the embodiments described above.

[0054] A portion of this invention can be applied to computer program products, such as computer program instructions, which, when executed by a computer, can invoke or provide the methods and / or technical solutions according to the invention through the operation of the computer. Those skilled in the art will understand that the forms in which computer program instructions exist in a computer-readable medium include, but are not limited to, source files, executable files, installation package files, etc. Correspondingly, the ways in which computer program instructions are executed by a computer include, but are not limited to: the computer directly executing the instructions, or the computer compiling the instructions and then executing the corresponding compiled program, or the computer reading and executing the instructions, or the computer reading and installing the instructions and then executing the corresponding installed program. Here, the computer-readable medium can be any available computer-readable storage medium or communication medium accessible to a computer.

[0055] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A method for controlling an audio system, characterized in that, The audio source has a preset threshold range, and the method includes: Real-time acquisition of input audio signal level; Based on the comparison result between the input audio signal level and the preset threshold range, a preset adjustment method for the output audio signal level is determined; wherein, If the input audio signal level is not within the preset threshold range, the preset adjustment method is to make the output audio signal level lower than the input audio signal level.

2. The method for controlling an audio system according to claim 1, characterized in that, If the input audio signal level is not within a preset threshold range, the preset adjustment method is to make the output audio signal level less than the input audio signal level, including: If the input audio signal level is greater than the upper limit of the preset threshold range, the preset adjustment method is to set the output audio level to the upper limit of the preset threshold range.

3. The method for controlling an audio system according to claim 1, characterized in that, If the input audio signal level is not within a preset threshold range, the preset adjustment method is to make the output audio signal level less than the input audio signal level, including: If the input audio signal level is less than the lower limit of the preset threshold range, the preset adjustment method is to obtain a first preset adjustment coefficient and calculate the output audio signal level according to the following formula: Among them, P i Input audio signal level; P o Input audio signal level; K1 is the first preset adjustment coefficient, K1>1; b is the adjustment value.

4. The method for controlling an audio system according to claim 1, characterized in that, If the input audio signal level is not within a preset threshold range, the preset adjustment method is to make the output audio signal level less than the input audio signal level, including: If the input audio signal level is less than the lower limit of the preset threshold range, then it is determined whether the speaker has a preset digital volume meter. If the audio system has a preset digital volume meter, then the preset adjustment method is to cut off the output audio signal level; If the speaker has a preset digital volume meter, the preset adjustment method is to obtain a first preset adjustment coefficient and calculate the output audio signal level according to the following formula: Among them, P i Input audio signal level; P o Input audio signal level; K1 is the first preset adjustment coefficient, K1>1; b is the adjustment value.

5. A method for controlling an audio system according to claim 3 or 4, characterized in that, The method further includes: In debug mode, the input audio signal level is gradually reduced below the lower limit of the preset threshold range, and the first preset adjustment coefficient is increased when current noise or white noise occurs. Stores the first preset adjustment factor when reducing the input audio signal level will not produce current noise or white noise.

6. The method for controlling an audio system according to claim 1, characterized in that, The step of determining the preset adjustment method for the output audio signal level based on the comparison result between the input audio signal level and the preset threshold range includes: If the input audio signal level is within a preset threshold range, the preset adjustment method is to make the output audio signal level greater than or equal to the input audio signal level.

7. The method for controlling an audio system according to claim 6, characterized in that, The step of determining the preset adjustment method for the output audio signal level based on the comparison result between the input audio signal level and the preset threshold range includes: If the input audio signal level is within a preset threshold range and is the upper limit of the preset threshold range, then the preset adjustment method is to make the output audio signal level equal to the input audio signal level; If the input audio signal level is within a preset threshold range but not at the upper limit of the preset threshold range, then the preset adjustment method is to make the output audio signal level greater than the input audio signal level.

8. The method for controlling an audio system according to claim 6, characterized in that, The step of determining the preset adjustment method for the output audio signal level based on the comparison result between the input audio signal level and the preset threshold range includes: If the input audio signal level is within a preset threshold range, the preset adjustment method is to obtain a second preset adjustment coefficient and calculate the output audio signal level according to the following formula: Among them, P i Input audio signal level; P o Input audio signal level; K2 is the first preset adjustment coefficient, 0.9 < K2 < 1; b is the adjustment value.

9. A method for controlling an audio system according to claim 8, characterized in that, The method further includes: In debug mode, the input audio signal level is adjusted within a preset threshold range, and the second preset adjustment coefficient is reduced when current noise or white noise occurs. Store a second preset adjustment factor when reducing the input audio signal level will not produce current noise or white noise.

10. A method for controlling an audio system according to any one of claims 1-9, characterized in that, The upper limit of the preset threshold range is -6dB, and the lower limit of the preset threshold range is -60dB.

11. A sound system, characterized in that: The device includes a memory and a processor, which are communicatively connected to each other. The memory stores computer instructions, and the processor executes the computer instructions to perform the audio control method according to any one of claims 1-10.

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