Processing method for suppressing audio background noise and related device

Abstract

The invention is suitable for the technical field of digital audio adjustment, provides a processing method for suppressing audio background noise and a related device, and aims to suppress a background noise signal value in an audio input signal before gain processing, reduce interference caused by gain amplification of the background noise signal value and improve user experience. The method is applied to a sound system and mainly comprises the steps that an audio input signal is acquired, and the audio input signal is a signal which is not subjected to gain processing; suppression processing is carried out on the audio input signal according to a preset ground noise signal value, a first audio output signal is obtained, and the target ground noise signal value is a preset signal value needing suppression; performing gain processing on the first audio output signal according to a preset volume table to obtain a second audio output signal, the volume table recording digital power amplifier gains corresponding to different volume step numbers; and playing according to the second audio output signal.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of digital audio adjustment, and particularly relates to an audio floor noise suppression processing method and a related device. BACKGROUND

[0002] A sound system, abbreviated as sound (Sound), refers to a complete set of devices that can restore and play audio signals. Currently, the input sensitivity of product devices equipped with a sound system is adjusted to be relatively high, which can restore small audio signals well, ensure the integrity of the sound, and also can enhance the loudness and clarity of the sound expressed by the audio signal. That is, although the sound system sets a high sensitivity for the input of the audio signal, which can improve the sound quality of the small signal, when the input sensitivity of the audio signal is adjusted to be very high, the gain of the entire audio signal transmission link is very large, which will cause the noise signal contained in the audio signal to also be amplified with the input, affecting the user experience. SUMMARY

[0003] The purpose of the present application is to provide an audio floor noise suppression processing method and a related device, which suppresses the floor noise signal value in the audio input signal before gain processing, reduces the interference caused by the gain amplification of the floor noise signal value, and improves the user experience.

[0004] In a first aspect, the present application provides an audio floor noise suppression processing method applied to a sound system, comprising:

[0005] Obtaining an audio input signal, the audio input signal being an unprocessed signal;

[0006] Suppressing the audio input signal according to a preset floor noise signal value to obtain a first audio output signal, the target floor noise signal value being a preset signal value that needs to be suppressed;

[0007] Gain processing the first audio output signal according to a preset volume table to obtain a second audio output signal, the volume table recording the digital power amplifier gain corresponding to different volume steps;

[0008] Playing the second audio output signal.

[0009] Optionally, the preset floor noise signal value is a device inherent noise value of the sound system; and / or,

[0010] The preset floor noise signal value is a target noise value that needs to be suppressed.

[0011] Optionally, suppressing the audio input signal according to a preset floor noise signal value comprises:

[0012] The bottom noise signal value in the audio input signal is subjected to large slope attenuation, so that the bottom noise signal value in the audio input signal is locally suppressed.

[0013] Optionally, before the audio input signal is acquired, the method further comprises:

[0014] determining the device inherent noise value of the sound system; and / or,

[0015] determining the target noise value that needs to be suppressed.

[0016] Optionally, the method further comprises:

[0017] receiving a modification of the digital power amplifier gain corresponding to different volume steps in the volume table, to obtain a new volume table;

[0018] The gain processing of the first audio output signal according to the preset volume table comprises:

[0019] The gain processing of the first audio output signal according to the new volume table.

[0020] Optionally, the volume table is provided with default values of the digital power amplifier gain corresponding to different volume steps;

[0021] When the gain recovery default value instruction is received, the default values of the digital power amplifier gain corresponding to different volume steps in the volume table are recovered.

[0022] In a second aspect, the application provides a bottom noise suppression processing device applied to a sound system, comprising:

[0023] An acquisition unit is configured to acquire an audio input signal, wherein the audio input signal is an unprocessed signal;

[0024] A suppression unit is configured to perform suppression processing on the audio input signal according to a preset bottom noise signal value, to obtain a first audio output signal, wherein the target bottom noise signal value is a preset signal value that needs to be suppressed.

[0025] A gain unit is configured to perform gain processing on the first audio output signal according to a preset volume table, to obtain a second audio output signal, wherein the volume table records digital power amplifier gains corresponding to different volume steps.

[0026] A playing unit is configured to play according to the second audio output signal.

[0027] Optionally, the preset bottom noise signal value is a device inherent noise value of the sound system; and / or,

[0028] The preset bottom noise signal value is a target noise value that needs to be suppressed.

[0029] Optionally, when the suppression unit suppresses the audio input signal according to the preset noise floor value, the suppression unit is specifically configured to:

[0030] performing large slope attenuation on the noise floor value in the audio input signal, so that the noise floor value in the audio input signal is locally suppressed.

[0031] Optionally, the apparatus further comprises:

[0032] a determination unit configured to determine the device inherent noise value of the sound system; and / or,

[0033] the determination unit is further configured to determine the target noise value that needs to be suppressed.

[0034] Optionally, the apparatus further comprises:

[0035] a receiving unit configured to receive a modification of the digital power amplifier gain corresponding to different volume steps in the volume table, to obtain a new volume table;

[0036] when the gain unit performs gain processing on the first audio output signal according to the preset volume table, the gain unit is specifically configured to:

[0037] perform gain processing on the first audio output signal according to the new volume table.

[0038] Optionally, the volume table is provided with default values of the digital power amplifier gain corresponding to different volume steps.

[0039] a recovery unit configured to, when receiving a gain recovery default value instruction, recover the digital power amplifier gain corresponding to different volume steps in the volume table to the default values.

[0040] In a third aspect, the present application provides a computer device, comprising:

[0041] a processor, a memory, a bus, an input / output interface, and a network interface;

[0042] the processor is connected to the memory, the input / output interface, and the network interface through the bus;

[0043] the memory stores a program;

[0044] when the processor executes the program stored in the memory, the suppression method for audio noise floor is realized.

[0045] In a fourth aspect, the present application provides a computer storage medium, wherein the computer storage medium stores instructions, and the instructions, when executed on a computer, cause the computer to perform the audio noise floor suppression method according to any one of the first aspect.

[0046] In a fifth aspect, the present application provides a computer program product, wherein the computer program product, when executed on a computer, causes the computer to perform the audio noise floor suppression method according to any one of the first aspect.

[0047] The above technical solutions can achieve the following advantages:

[0048] The embodiment of the present application is applied to an audio noise floor suppression method of an audio system. The audio input signal is obtained, wherein the audio input signal is a signal without gain processing. The audio input signal is suppressed according to a preset noise floor signal value to obtain a first audio output signal, wherein the target noise floor signal value is a signal value that needs to be suppressed. The first audio output signal is gain processed according to a preset volume table to obtain a second audio output signal, wherein the volume table records the digital power amplifier gain corresponding to different volume steps. The second audio output signal is played, so that the noise floor signal value in the audio input signal is suppressed before gain processing, the interference caused by the noise floor signal value being amplified by gain is reduced, and the user experience of playing sound by the audio system is improved. BRIEF DESCRIPTION OF DRAWINGS

[0049] Figure 1 FIG. 1 is a flowchart of an embodiment of the audio noise floor suppression method of the present application;

[0050] Figure 2 FIG. 2 is a flowchart of another embodiment of the audio noise floor suppression method of the present application;

[0051] Figure 3 FIG. 3 is a structural diagram of an embodiment of the audio noise floor suppression device of the present application;

[0052] Figure 4 FIG. 4 is a structural diagram of another embodiment of the audio noise floor suppression device of the present application;

[0053] Figure 5 FIG. 5 is a structural diagram of an embodiment of the computer device of the present application;

[0054] Figure 6 FIG. 6 is a diagram of an embodiment in which the -90 dB signal input is not attenuated by a large slope in the DRC software debugging interface;

[0055] Figure 7An embodiment diagram of the application for a large slope attenuation of -90dB signal input in the DRC software debugging interface;

[0056] Figure 8 An embodiment diagram of the application for a large slope attenuation of -90dB signal input in the DRC software debugging interface;

[0057] Figure 9 An embodiment diagram of the application for a large slope attenuation of -90dB signal input in the DRC software debugging interface; DETAILED DESCRIPTION

[0058] In order to make the purpose, technical solutions and advantages of the application more clear, the application is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the application and do not limit the application.

[0059] It should be noted that the noise floor mentioned in the embodiments, also known as "background noise", is generally referred to as the inherent noise that exists and is generated by electronic equipment or electronic systems when there is no signal input; the noise floor is also referred to as the inherent background noise unrelated to the target signal during signal transmission or recording. The noise floor can come from various internal circuit interferences of electronic equipment (such as thermal noise), subtle sounds in the environment (such as air conditioner sound, fan sound), or inherent noise in the soundproof screening room; in the electro-acoustic system, the noise floor is also defined as "total noise other than useful signal", including equipment noise (such as white noise, pink noise) and playback environment noise, etc.

[0060] Sound system, referred to as sound, is a set of devices that can restore and play audio signals. The sound system of the embodiment mainly consists of a sound source device, a sound processing device, a power amplification device, a loudspeaker, an audio cable, a power supply and the like. The sound source device is used to generate an audio input signal, for example, the sound source device is a CD player, a radio, a computer and the like, and the audio carrier of the sound source device can be a mobile hard disk, an optical disc, a magnetic tape and the like. The sound processing device is mainly used to amplify, equalize and adjust the audio input signal input by the sound source device, mix multiple signals and distribute them to different output ends, realize the core of the sound chain, and ensure sound balance and flexible control. The power amplification device is mainly used to amplify the pre-stage signal distributed by the sound processing device to drive the loudspeaker to output high voltage and large current. The loudspeaker, also known as a sound box or a loudspeaker, is mainly used to convert an audio signal into a sound wave, as the final link of the audio signal conversion into a sound mechanical wave output in the sound system. The loudspeaker can include a single channel, stereo, quasi-stereo, four-channel surround, 5.1 channel and the like according to the needs of the scene. The audio cable is used to connect the sound source device, the sound processing device, the power amplification device and the loudspeaker, and to ensure the transmission stability of the process of converting the audio signal into a sound mechanical wave. The power supply is mainly used to provide appropriate working voltage for the sound source device, the sound processing device, the power amplification device and the loudspeaker. In the sound system, there is also a bottom noise. From the generation of the audio input signal from the sound source device to the conversion into a sound mechanical wave by the loudspeaker, the process may introduce a bottom noise.

[0061] At present, the input sensitivity of the product device equipped with the sound system is adjusted to be relatively high, which can restore the small audio signal well, ensure the integrity of the sound, and also can enhance the loudness and clarity of the sound expressed by the audio signal. That is, although the high sensitivity of the sound system to the input of the audio signal can improve the sound quality of the small signal, when the input sensitivity of the audio signal is adjusted to be very high, the gain of the entire audio signal transmission link is very large, which will cause the noise signal contained in the audio signal to be amplified with the input, affecting the user experience.

[0062] Based on the above understanding, please refer to Figure 1 The application is applied to an embodiment of a method for suppressing audio bottom noise of a sound system, which comprises:

[0063] 101, obtaining an audio input signal.

[0064] The audio input signal of the embodiment refers to a signal that has not been subjected to gain processing. For example, the audio input signal is obtained from the sound source device of the sound system, and the signal has not been processed by the sound processing device.

[0065] 102, suppressing the audio input signal according to a preset bottom noise signal value to obtain a first audio output signal.

[0066] The preset noise signal value in the embodiment is a signal value that needs to be suppressed; for example, the noise signal value is the inherent noise value of the sound system itself existing and generated when there is no signal input. The noise signal value can be known through detection, testing and evaluation of the sound system. This step can suppress the audio input signal according to the preset noise signal value, and then obtain a first audio output signal.

[0067] Specifically, this step can attenuate the noise signal value in the audio input signal with a large slope, so that the noise signal value in the audio input signal is locally suppressed, realizing suppression processing of the noise signal value. For example, assuming that the noise signal value is -90 dB signal, the sound system is digitally power amplified, and the interface display of the DRC software debugging interface without large slope attenuation for -90 dB signal input is as shown in Figure 6 The interface display of the DRC software debugging interface with large slope attenuation for -90 dB signal input is as shown in Figure 7 The red line is the power curve of the input to the output of the power amplifier, and the large slope attenuation is set for -90 dB signal input, that is, the electrical signal output is locally suppressed at -90 dB signal input. Experiments show that the bottom noise is significantly reduced in actual listening, and the experience of the entire sound system is improved.

[0068] 103. Gain processing the first audio output signal according to the preset volume table to obtain a second audio output signal.

[0069] In the embodiment, the volume table records the digital power amplifier gain corresponding to different volume steps. The digital power amplifier gain can be controlled by the volume table through the digital power amplifier gain software interface (for example, as shown in Figure 8 Specifically, assuming that different angles of rotation of the power amplifier VOLUME knob correspond to different volume steps, the volume table of the embodiment can be as shown in Figure 9 The embodiment realizes gain processing of the first audio output signal according to the volume table by rotating the power amplifier VOLUME knob to obtain a second audio output signal.

[0070] 104. Playing according to the second audio output signal.

[0071] The second audio output signal obtained in step 103 is played through the loudspeaker of the sound system to realize the sound function. It can be seen that, by combining step 102 and step 103, the noise signal value of the sound system can be effectively suppressed, the noise signal value in the audio input signal is suppressed before gain processing, the interference caused by the noise signal value being amplified by gain is reduced, the signal-to-noise ratio of the small volume effective signal and the noise signal in the sound system is improved, and the user's auditory experience of the entire sound system is improved.

[0072] Please refer to Figure 2 , another embodiment of the application applied to a sound system, a method for suppressing audio noise, comprising:

[0073] 201, determine the device inherent noise value of the sound system; and / or, determine the target noise value that needs to be suppressed.

[0074] It should be noted that the embodiment needs to measure the device inherent noise value of the sound system, for example, it can be known by detecting, testing and evaluating the sound system; in order to achieve better noise suppression effect, the embodiment also reserves the target noise value set by the user according to the actual need, which can be environmental noise.

[0075] 202, obtain the audio input signal.

[0076] The execution of this step is similar to step 101 in the foregoing Figure 1 embodiment, and the repeated parts are not described here.

[0077] 203, suppress the audio input signal according to the preset noise signal value, and obtain the first audio output signal.

[0078] The execution of this step is similar to step 102 in the foregoing Figure 1 embodiment, and the repeated parts are not described here.

[0079] 204, receive the modification of the digital power amplifier gain corresponding to different volume steps in the volume table, and obtain a new volume table.

[0080] It can be understood that the preset volume table in the embodiment can be modified according to the actual need in order to meet the dynamic actual need; and the volume table of the embodiment is provided with default values of the digital power amplifier gain corresponding to different volume steps; when the gain recovery default value instruction is received, the digital power amplifier gain corresponding to different volume steps in the volume table is recovered to the default value.

[0081] 205, gain process the first audio output signal according to the new volume table, and obtain the second audio output signal.

[0082] The execution of this step is similar to step 103 in the foregoing Figure 1 embodiment, and the repeated parts are not described here.

[0083] 206, play according to the second audio output signal.

[0084] The execution of this step is similar to step 104 in the foregoing Figure 1 embodiment, and the repeated parts are not described here.

[0085] The embodiment utilizes the digital power amplifier DRC power curve setting to suppress small signals, and then uses the volume table to control the gain of the digital power amplifier, so that the signal-to-noise ratio of the whole audio system can be improved. For the design of the digital power amplifier DRC and the volume table to control the gain, the input sensitivity of the audio system can be improved, so that the audio product has a good sound quality experience at a large volume. The signal-to-noise ratio of the audio system at a small volume effective signal and noise signal can improve the experience of the whole audio product.

[0086] The above embodiment describes an audio noise floor suppression processing method applied to an audio system, and the following describes an audio noise floor suppression processing device applied to an audio system. Please refer to Figure 3 An audio noise floor suppression processing device applied to an audio system includes:

[0087] An acquisition unit 301 is configured to acquire an audio input signal, which is an unprocessed signal.

[0088] A suppression unit 302 is configured to perform suppression processing on the audio input signal according to a preset noise floor signal value to obtain a first audio output signal, wherein the target noise floor signal value is a signal value that needs to be suppressed.

[0089] A gain unit 303 is configured to perform gain processing on the first audio output signal according to a preset volume table to obtain a second audio output signal, wherein the volume table records the digital power amplifier gain corresponding to different volume steps.

[0090] A playing unit 304 is configured to play according to the second audio output signal.

[0091] The operations performed by the audio noise floor suppression processing device applied to an audio system in the embodiment are similar to those described in the foregoing Figure 1 embodiment, and thus are not described here.

[0092] Please refer to Figure 4 Another embodiment of the audio noise floor suppression processing device applied to an audio system includes:

[0093] An acquisition unit 401 is configured to acquire an audio input signal, which is an unprocessed signal.

[0094] A suppression unit 402 is configured to perform suppression processing on the audio input signal according to a preset noise floor signal value to obtain a first audio output signal, wherein the target noise floor signal value is a signal value that needs to be suppressed.

[0095] The gain unit 403 is configured to perform gain processing on the first audio output signal according to a preset volume table, to obtain a second audio output signal, wherein the volume table records digital power amplifier gains corresponding to different volume steps.

[0096] The playing unit 404 is configured to play according to the second audio output signal.

[0097] Optionally, the preset noise floor signal value is a device inherent noise value of the sound system; and / or,

[0098] The preset noise floor signal value is a target noise value to be suppressed.

[0099] Optionally, when the suppressing unit 402 performs suppression processing on the audio input signal according to the preset noise floor signal value, the suppressing unit 402 is specifically configured to:

[0100] perform large slope attenuation on the noise floor signal value in the audio input signal, so that the noise floor signal value in the audio input signal is locally suppressed.

[0101] Optionally, the apparatus further comprises:

[0102] The determining unit 405 is configured to determine the device inherent noise value of the sound system; and / or,

[0103] The determining unit 405 is further configured to determine the target noise value to be suppressed.

[0104] Optionally, the apparatus further comprises:

[0105] The receiving unit 406 is configured to receive modification of digital power amplifier gains corresponding to different volume steps in the volume table, to obtain a new volume table.

[0106] When the gain unit 403 performs gain processing on the first audio output signal according to the preset volume table, the gain unit 403 is specifically configured to:

[0107] perform gain processing on the first audio output signal according to the new volume table.

[0108] Optionally, the volume table is provided with default values of digital power amplifier gains corresponding to different volume steps.

[0109] The restoring unit 407 is configured to, when receiving a gain restoring default value instruction, restore the default values of digital power amplifier gains corresponding to different volume steps in the volume table.

[0110] The embodiment applied to a kind of suppressing audio noise processing device of sound system of the operation executed by the apparatus and the operation similar to the operation described in the foregoing Figure 2 Embodiment, will not be repeated here.

[0111] The computer device in the embodiments of the present application is described below. Please refer to Figure 5 One embodiment of the computer device in the embodiments of the present application includes:

[0112] The computer device 500 can include one or more processors (central processing units, CPU) 501 and a memory 502 in which one or more application programs or data are stored. The memory 502 is volatile storage or persistent storage. The programs stored in the memory 502 can include one or more modules, each of which can include a series of instruction operations in the computer device. Further, the processor 501 can be configured to communicate with the memory 502 to execute a series of instruction operations in the memory 502 on the computer device 500. The computer device 500 can also include one or more wireless network interfaces 503, one or more input / output interfaces 504, and / or one or more operating systems, such as HarmonyOS, Windows Server, Mac OS, Unix, Linux, FreeBSD, etc. The processor 501 can execute the operations performed in any of the embodiments described above, which will not be described here in detail. Figures 1 to 2 The operations performed in any of the embodiments described above can be executed by the processor 501, which will not be described here in detail.

[0113] In several embodiments provided in the embodiments of the present application, those skilled in the art should understand that the disclosed system, device and method can be implemented by other ways. For example, the device embodiments described above are only schematic, for example, the division of the units is only a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units or components shown or discussed can be indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0114] In addition, each of the function units in each embodiment of the present application can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of a software function unit. When the integrated unit is realized in the form of a software function unit and sold or used as an independent product, it can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application, the essential part or the contribution to the prior art, or all or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the embodiments of the present application. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM, read-only memory), a random access memory (RAM, random access memory), a magnetic disk or an optical disk, and various media that can store program codes.

[0115] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modifications, equivalent replacements or improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method for suppressing audio background noise, characterized in that: Applied to audio systems, including: Acquire an audio input signal, where the audio input signal is a signal that has not been gain-processed; Suppressing the audio input signal according to a preset background noise signal value to obtain a first audio output signal, wherein the target background noise signal value is a preset signal value to be suppressed; performing gain processing on the first audio output signal according to a preset volume meter to obtain a second audio output signal, wherein the volume meter records the digital amplifier gains corresponding to different volume steps; Playing is performed according to the second audio output signal.

2. The method for suppressing audio background noise according to claim 1, wherein: The preset background noise signal value is the inherent noise value of the equipment of the sound system; and / or, The preset background noise signal value is a target noise value that needs to be suppressed.

3. The method for suppressing audio background noise according to claim 2, wherein: Suppressing the audio input signal according to a preset background noise signal value includes: A high-slope attenuation is performed on the background noise signal value in the audio input signal, so that the background noise signal value in the audio input signal is locally suppressed.

4. The method for suppressing audio background noise according to claim 2, wherein: Before acquiring the audio input signal, the method further includes: Determining the inherent noise value of the device of the sound system; and / or, The target noise value that needs to be suppressed is determined and set.

5. The method for suppressing audio background noise according to claim 1, wherein: The method further comprises: receiving a modification of a digital power amplifier gain corresponding to different volume steps in the volume meter to obtain a new volume meter; The performing gain processing on the first audio output signal according to a preset volume meter includes: Perform gain processing on the first audio output signal according to the new volume meter.

6. The method for processing audio background noise according to claim 5, characterized in that: The volume meter is set with default values ​​of digital amplifier gains corresponding to different volume steps; When a gain restoration default value instruction is received, the digital power amplifier gains corresponding to different volume steps in the volume table are restored to the default values.

7. A device for suppressing audio background noise, characterized in that: Applied to audio systems, including: an acquisition unit, configured to acquire an audio input signal, wherein the audio input signal is a signal that has not been gain-processed; a suppression unit, configured to suppress the audio input signal according to a preset background noise signal value to obtain a first audio output signal, wherein the target background noise signal value is a preset signal value to be suppressed; a gain unit, configured to perform gain processing on the first audio output signal according to a preset volume meter to obtain a second audio output signal, wherein the volume meter records digital power amplifier gains corresponding to different volume steps; A playing unit is configured to play according to the second audio output signal.

8. A computer device, characterized in that: include: Processor, memory, bus, input and output interface, network interface; The processor is connected to the memory, the input / output interface, and the network interface via a bus; The memory stores a program; When the processor executes the program stored in the memory, the method for suppressing audio background noise as described in any one of claims 1 to 6 is implemented.

9. A computer storage medium, characterized in that The computer storage medium stores instructions, and when the instructions are executed on a computer, the computer executes the audio noise suppression processing method according to any one of claims 1 to 6.

10. A computer program product, characterized in that When the computer program product is executed on a computer, the computer is caused to execute the audio noise suppression processing method according to any one of claims 1 to 6.

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