Dual power amplifier switching method and system

Abstract

The embodiments of the present specification provide a dual-amplifier working switching method and system, the method comprising: obtaining audio information of input audio from an input source; identifying characteristics of a target audience within a broadcasting range of a speaker; switching the type of a working power amplifier in a broadcasting system based on the audio information of the input audio and the characteristics of the target audience within the broadcasting range, comprising: when the characteristics of the target audience within the broadcasting range meet a first preset condition and the type of the input audio meets a second preset condition, the broadcasting system switches the working power amplifier to a first type of amplifier; when the characteristics of the target audience within the broadcasting range meet a third preset condition and the type of the input audio meets a fourth preset condition, the broadcasting system switches the working power amplifier to a second type of amplifier.

Description

Technical Field

[0001] The present invention relates to the field of audio technology, and in particular to a dual power amplifier switching method and system. Background Art

[0002] A power amplifier is abbreviated as a power amplifier or amplifier. It generally refers to a basic device in an audio system, commonly known as a "loudspeaker". A power amplifier can be used to amplify weak electrical signals from a signal source or a mixer in a professional audio system to drive a speaker, or "speaker", to produce sound. A power amplifier can also refer to other devices that perform power amplification.

[0003] The power amplifier can amplify the weak signal input by the sound source equipment and generate a large enough current to drive the speaker to reproduce the sound. Due to considerations of power, impedance, distortion, dynamics, different usage ranges and control adjustment functions, different power amplifiers have different internal signal processing, circuit design and production processes. According to the principle of amplifying analog signals, power amplifiers can be divided into Class A, Class B, Class AB, and Class D.

[0004] The two or two groups of output tubes in the output stage of a Class A amplifier are always in a conductive state. Regardless of whether there is a signal input or not, they keep conducting current and make the two currents equal to the peak value of the alternating current. The working mode of a Class A amplifier has the best linearity. Each output tube amplifies the full wave of the signal, and there is no crossover distortion at all. The biggest disadvantage of a Class A amplifier is its low efficiency, because full current still flows in when there is no signal, and all the electrical energy is converted into high heat. When the signal level increases, some power can enter the load, but a lot of it is still converted into heat. The advantage of a Class A amplifier is that it is an ideal choice for replaying music, providing smooth sound quality, mellow and warm sound, and transparent and open treble.

[0005] The working principle of Class B amplifier is completely different from that of pure Class A power amplifier. When in operation, the positive and negative channels of the transistor are usually closed unless there is a signal input. When the positive signal passes through, only the positive channel works, and the negative channel is closed. Both channels will never work at the same time. Therefore, there is no power loss in the part without signal. When the positive and negative channels are turned on and off, crossover distortion often occurs, especially at low levels. Strictly speaking, Class B amplifiers are not high-fidelity amplifiers. Class B amplifiers are about 75% efficient, generate less heat than Class A amplifiers, and generally use smaller heat sinks.

[0006] Class AB amplifiers are compatible with the advantages of Class A and Class B amplifiers, and balance the performance of the two. They are the mainstream amplifier products at present. Class AB amplifiers usually have two bias voltages, and a small amount of current will pass through the output tube when there is no signal; when the signal is small, the Class A amplifier working mode is used to obtain the best linearity. When the signal reaches a certain level, it automatically switches to the Class B amplifier working mode to obtain better efficiency. The advantages of Class AB amplifiers are that they can obtain good sound quality fidelity, improve efficiency and reduce heat output. The disadvantage is that crossover distortion will occur.

[0007] Class D amplifiers are digital amplifiers. Class D amplifiers directly connect the load and the power supply. There is no voltage on the output tube at the current flow point, so there is no power consumption. When the output tube is turned off, the full power supply voltage will appear on the transistor. Without current, there is no power consumption. In theory, the working efficiency of Class D amplifiers is 100%. The advantages of Class D amplifiers are the highest efficiency, the power supply can be reduced, almost no heat is generated, and the heat generated without the need for a large radiator is very low, so Class D amplifiers do not require a large radiator, the body size and weight are also significantly reduced, and the relative cost is lower. However, Class D amplifiers are complex to work, and the added circuits themselves are inevitably biased, the distortion is more serious, the EMI index is poor, and the radiation is relatively higher.

[0008] In an audio system, the power amplifier, as a core component, often affects whether the entire audio system can work properly. Generally, in an audio playback system that needs to ensure high availability, two power amplifiers are often required to prevent the entire audio system from failing when one of the power amplifiers fails. The two power amplifiers are usually a class AB amplifier and a class D amplifier. However, in general, the class D amplifier exists in the audio playback system as a backup for the class AB amplifier. When the class AB amplifier fails, the audio playback system switches to the class D amplifier. Therefore, under normal circumstances, the playback system is less efficient, has high energy consumption, and the more expensive class AB amplifier has a longer working time and is more prone to failure.

[0009] Therefore, it is of great significance for those skilled in the art to study a dual-amplifier switching method and system that can switch working amplifiers according to playback scenarios and audience characteristics. Summary of the invention

[0010] One or more embodiments of the present specification provide a dual-amplifier working switching method, characterized in that the method includes: obtaining information of input audio from an input source; identifying characteristics of a target audience within a broadcasting range of a speaker; switching the type of a working power amplifier in a broadcasting system based on the audio information of the input audio and the characteristics of the target audience within the broadcasting range, including: when the characteristics of the target audience within the broadcasting range meet a first preset condition and the type of the input audio meets a second preset condition, the broadcasting system switches the working power amplifier to a first type of power amplifier; when the characteristics of the target audience within the broadcasting range meet a third preset condition and the type of the input audio meets a fourth preset condition, the broadcasting system switches the working power amplifier to a second type of power amplifier.

[0011] One or more embodiments of the present specification provide a dual-amplifier working switching system, characterized in that the system includes: an audio information acquisition module for acquiring information about input audio from an input source; a broadcast range audience information acquisition module for identifying characteristics of a target audience within the broadcast range of a speaker; and a dual-amplifier working switching module for switching the type of working amplifier in the broadcast system based on the audio information of the input audio and the characteristics of the target audience within the broadcast range.

[0012] One or more embodiments of the present specification provide a dual-amplifier operation switching device, the device comprising at least one processor and at least one memory; the at least one memory is used to store computer instructions; the at least one processor is used to execute at least part of the computer instructions to implement the dual-amplifier operation switching method described in any of the above embodiments.

[0013] One or more embodiments of the present specification provide a computer-readable storage medium, wherein the storage medium stores computer instructions. When a computer reads the computer instructions in the storage medium, the computer executes the method for switching dual power amplifier operation as described in any one of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] This specification will be further described in the form of exemplary embodiments, which will be described in detail by the accompanying drawings. These embodiments are not restrictive, and in these embodiments, the same number represents the same structure, wherein:

[0015] Figure 1 is a schematic diagram of an application scenario of a dual power amplifier working switching system according to some embodiments of this specification;

[0016] Figure 2 is an exemplary module diagram of a dual power amplifier operation switching system according to some embodiments of this specification;

[0017] Figure 3is an exemplary flow chart of a method for switching dual power amplifier operation according to some embodiments of this specification;

[0018] Figure 4 It is a schematic diagram of an audio content determination model according to some embodiments of this specification. DETAILED DESCRIPTION

[0019] In order to more clearly illustrate the technical solutions of the embodiments of this specification, the following is a brief introduction to the drawings required for the description of the embodiments. Obviously, the drawings described below are only some examples or embodiments of this specification. For ordinary technicians in this field, this specification can also be applied to other similar scenarios based on these drawings without creative work. Unless it is obvious from the language environment or otherwise explained, the same reference numerals in the figures represent the same structure or operation.

[0020] It should be understood that the "system", "device", "unit" and / or "module" used herein are a method for distinguishing different components, elements, parts, portions or assemblies at different levels. However, if other words can achieve the same purpose, the words can be replaced by other expressions.

[0021] As shown in this specification and claims, unless the context clearly indicates an exception, the words "a", "an", "an" and / or "the" do not refer to the singular and may also include the plural. Generally speaking, the terms "comprise" and "include" only indicate the inclusion of the steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0022] Flowcharts are used in this specification to illustrate the operations performed by the system according to the embodiments of this specification. It should be understood that the preceding or following operations are not necessarily performed precisely in order. Instead, the steps may be processed in reverse order or simultaneously. At the same time, other operations may also be added to these processes, or one or more operations may be removed from these processes.

[0023] Figure 1 Schematic diagram of an application scenario of a dual power amplifier switching system according to some embodiments of this specification. Figure 1 As shown, the application scenario 100 of the dual-amplifier working switching system includes a dual-amplifier working switching system 110, a network 120, a storage device 130, a processor 140, and a terminal device 150. The dual-amplifier working switching system 110 includes a playback scene recognition device and a class AB amplifier and a class D amplifier.

[0024] The dual amplifier working switching system 110 can be used to switch the working amplifier to a class AB amplifier or a class D amplifier based on different playback scenarios. For example, the dual amplifier working switching system 110 can be used to determine the switched working amplifier based on audio playback environment information. For example, the working amplifier can be switched based on the audio content being played.

[0025] The network 120 can connect the various components of the system and / or connect the system with external resources. The network 120 allows the various components to communicate with each other and with other parts outside the system, and promotes the exchange of data and / or information. For example, the processor 140 can obtain audio playback environment related data from the storage device 130 through the network 120. For another example, the processor 140 can determine whether to switch the working amplifier from the system 110 through the network 120. For another example, the terminal device 150 can send an instruction to switch the working amplifier to the dual-amplifier working switching system 110 through the network 120. For another example, the terminal device 150 can obtain the working status of the dual-amplifier working switching system 110 through the network 120.

[0026] In some embodiments, the network 120 may be any one or more of a wired network or a wireless network. For example, the network 120 may include a cable network, an optical fiber network, a telecommunications network, the Internet, a local area network (LAN), a wide area network (WAN), a wireless local area network (WLAN), a metropolitan area network (MAN), a public switched telephone network (PSTN), a Bluetooth network, a ZigBee network (ZigBee), a near field communication (NFC), an in-device bus, an in-device line, a cable connection, or any combination thereof. The network connection between the various parts may be in one of the above-mentioned ways, or in a variety of ways. In some embodiments, the network may be a point-to-point, shared, centralized, or other topological structure or a combination of multiple topological structures.

[0027] The storage device 130 may be used to store data and / or instructions related to the application scenario 100 of the dual-amplifier work switching system. In some embodiments, the storage device 130 may store data and / or information obtained from the dual-amplifier work switching system 110, the processor 140, the terminal device 150, etc. For example, the storage device 130 may store audio playback scene information, preset amplifier working modes, etc.

[0028] The storage device 130 may include one or more storage components, each of which may be an independent device or a part of another device. In some embodiments, the storage device 130 may include a random access memory (RAM), a read-only memory (ROM), a mass storage device, a removable memory, a volatile read-write memory, or the like, or any combination thereof. Exemplarily, the mass storage device may include a magnetic disk, an optical disk, a solid-state disk, or the like. In some embodiments, the storage device 130 may be implemented on a cloud platform.

[0029] The processor 140 may be used to execute one or more functions disclosed in one or more embodiments of this specification. For example, the processor 140 may be used to send working power amplifier related data and broadcast environment related information and data to the terminal device 150 based on the network 120. For another example, the processor 140 may be used to send a switching working power amplifier instruction determined by the dual power amplifier working switching system 110 to the storage device 130 based on the network 120. For another example, the processor 140 may be used to send the working state of the working power amplifier determined by the dual power amplifier working switching system 110 to the terminal device 150 based on the network 120. In some embodiments, at least part of the components of the dual power amplifier working switching system 110 may be provided in the processor 140 as part of the processor 140.

[0030] In some embodiments, processor 140 may include one or more processing engines (e.g., a single-chip processing engine or a multi-chip processing engine). By way of example only, processor 140 may include a central processing unit (CPU), an application specific integrated circuit (ASIC), an application specific instruction processor (ASIP), a graphics processing unit (GPU), a physical processing unit (PPU), a digital signal processor (DSP), a field programmable gate array (FPGA), a programmable logic device (PLD), a controller, a microcontroller unit, a reduced instruction set computer (RISC), a microprocessor, etc., or any combination thereof.

[0031] The terminal device 150 may refer to one or more terminal devices or software used by a user. In some embodiments, the user may be a user of the terminal device 150, for example, the user of the terminal device 150 may be an audio playback system operator, an audio playback manager, etc. In some embodiments, the terminal device 150 may include a mobile device 150-1, a tablet computer 150-2, a laptop computer 150-3, a vehicle-mounted device, etc. or any combination thereof. In some embodiments, the terminal device 150 may include a signal transmitter and a signal receiver, which are configured to communicate with the dual-amplification working switching system 110 to obtain relevant information.

[0032] In some embodiments, the terminal device 150 may be fixed and / or mobile. For example, the terminal device 150 may be directly integrated into the dual-amplification switching system 110 and become a part of the processor 110 and / or the dual-amplification switching system 110. For another example, the terminal device 150 may be a mobile device, and a user may carry the terminal device 150 to a location far away from the processor 140 and the dual-amplification switching system 110, and the terminal device 150 may be connected and / or communicate with the processor 140 and / or the dual-amplification switching system 110 through the network 120. In some embodiments, the terminal device 150 may include the processor 140.

[0033] In some embodiments, the terminal device 150 may receive a user request and send information related to the request to the processor 140 via the network 120. For example, the terminal device 150 may receive a user request to send relevant information and send information related to the request to the processor 140 via the network 120. The terminal device 150 may also receive information from the processor 140 via the network 120. For example, the terminal device 150 may receive relevant information of the dual-amplifier working switching system 110 from the processor 140, and one or more determined relevant information may be displayed on the terminal device 150. For another example, the processor 140 may send the result of determining the relevant information of the dual-amplifier working switching system 110 (e.g., the working status of the working amplifier, etc.) or the relevant data of the working amplifier to the terminal device 150.

[0034] It should be noted that the application scenario 100 based on the dual-amplifier working switching system is provided only for the purpose of illustration and is not intended to limit the scope of this specification. For those of ordinary skill in the art, various modifications or changes can be made according to the description of this specification. For example, the application scenario can also include a database. For another example, the application scenario 100 can be implemented on other devices to achieve similar or different functions. However, changes and modifications will not deviate from the scope of this specification.

[0035] Figure 2 1 is an exemplary module diagram of a dual-amplifier switching system according to some embodiments of the present specification. In some embodiments, the dual-amplifier switching system 110 may include an audio information acquisition module 210 , a broadcast range audience information acquisition module 220 , and a dual-amplifier switching module 230 .

[0036] In some embodiments, the audio information acquisition module 210 is used to acquire audio information of the input audio of the input source. In some embodiments, the audio information acquisition module 210 may include an audio file information acquisition unit 211 and an audio content information determination unit 212. For a description of the audio information, please refer to Figure 3 Description of the part;

[0037] In some embodiments, the broadcast range audience information acquisition module 220 can be used to identify the characteristics of the target audience within the broadcast range of the speaker.

[0038] In some embodiments, the dual amplifier working switching module 230 can be used to switch the type of working amplifier in the broadcasting system based on the audio information of the input audio and the characteristics of the target audience within the broadcasting range. Figure 3 Description of the part;

[0039] It should be noted that the above description of the dual-amplifier working switching system and its modules is only for the convenience of description and cannot limit the present specification to the scope of the embodiments. It is understandable that for those skilled in the art, after understanding the principle of the system, it is possible to arbitrarily combine the modules or form a subsystem to connect with other modules without deviating from this principle. In some embodiments, Figure 2 The audio information acquisition module 210, the broadcast range audience information acquisition module 220 and the dual power amplifier work switching module 230 disclosed in the specification can be different modules in a system, or a module can realize the functions of two or more modules mentioned above. For example, each module can share a storage module, or each module can have its own storage module. Such variations are all within the protection scope of this specification.

[0040] Figure 3 300 is an exemplary flow chart of a dual-amplifier switching method according to some embodiments of this specification. In some embodiments, process 300 may be executed by a processor. Figure 3 As shown, process 300 includes the following steps:

[0041] Step 310 , obtaining audio information of the input audio from the input source. Step 310 may be performed by the audio information obtaining module 210 .

[0042] The input source input audio refers to the audio signal that the playback system needs to amplify through the power amplifier and play through the speaker. In some embodiments, the input source input audio includes a digital signal and an analog signal. The audio information refers to the relevant information of the input audio. In some embodiments, the audio information includes audio file information. In some embodiments, the audio information also includes audio content information.

[0043] In some embodiments, the audio file information can be obtained by a decoder of a playback system. In some embodiments, the audio file information includes audio format information and audio file meta information of the audio file. In some embodiments, the audio file format includes lossless compression formats (e.g., FLAC format, APE format, Apple Lossless format, etc.) and lossy compression formats (e.g., MP3 format, AAC format, Opus format, etc.). In some embodiments, the audio file meta information includes the sampling rate, bit rate, audio bandwidth, audio file name, etc. of the audio file. In some embodiments, the audio file meta information can also include the ancillary information of the audio file, such as information such as audio file drawings and audio file text.

[0044] The audio content information refers to information related to the content and type of the input audio from the input source, such as vocal songs, pure music, human voices, ambient sounds, etc. In some embodiments, a machine learning method may be used to determine the audio content information.

[0045] In some embodiments, the audio content information can be determined by an audio content determination model. In some embodiments, the audio content determination model can be a traditional algorithm model (e.g., a hidden Markov model (HMM) and a dynamic time warping (DTW) model) or a machine learning model (e.g., a recurrent neural network (RNN), a long short-term memory module (LSTM), a convolutional neural network (CNN), etc.). In some embodiments, the audio content determination model is a CNN model. In some embodiments, the audio content determination model can convert an audio file into a spectrogram, and input the spectrogram into a CNN plus linear classifier to generate a prediction about the sound content category.

[0046] Figure 4 It is a schematic diagram of an audio content determination model according to some embodiments of this specification.

[0047] In some embodiments, the audio content determination model may determine a classification of the audio content.

[0048] In some embodiments, the audio content determination model can convert the audio data in the audio file into a spectrogram, such as a Mel Spectrogram and / or a Mel Cepstral Map (MFCCs). In some embodiments, converting the audio file into a spectrogram includes converting the channels of the audio, such as converting the monophonic audio into a two-channel stereo. In some embodiments, converting the audio file into a spectrogram includes standardizing the sampling rate of the sound file, that is, standardizing all audio and converting it to the same sampling rate (e.g., 48kHz) so that all arrays have the same size. In some embodiments, converting the audio file into a spectrogram includes adjusting the size of all audio samples to have the same length. In some embodiments, the audio duration can be adjusted by filling with silence or truncating its length. In some embodiments, converting the audio file into a spectrogram includes applying a time offset to move the audio to the left or right by a random amount to perform data augmentation on the original audio signal. In some embodiments, the spectrogram can also be frequency masked, for example, by randomly masking a series of continuous frequencies by adding horizontal bars to the spectrogram. In some embodiments, the spectrogram can also be time-shielded, such as using vertical lines to randomly block the time range from the spectrogram. In some embodiments, the shielded portion can be replaced with an average value. Frequency masking and time masking of the spectrogram can prevent overfitting and help the audio content information model generalize better.

[0049] In some embodiments, the audio content determination model can be trained based on sample audio data.In some embodiments, the sample audio data includes sample audio and corresponding audio content tags (e.g., vocal songs, pure music, vocals, ambient sounds, etc.).

[0050] In some embodiments, the audio content determination model includes multiple CNN layers and linear layers, the input of the CNN layer in the audio content determination model includes the processed spectrum image, and the output of the CNN layer is a feature map. In some embodiments, the output of CNN can be used as the input of the linear layer. In some embodiments, the output of the linear layer can be the classification corresponding to the audio and its probability. In some embodiments, the audio content determination model can determine the classification with the highest probability value as the audio classification.

[0051] Step 320 , identifying characteristics of the target audience within the broadcast range of the speaker. Step 320 may be performed by the broadcast range audience information acquisition module 220 .

[0052] The speaker broadcast range refers to the area range that the audio content needs to cover. In some embodiments, the speaker broadcast range includes the space of a specific place, for example, a specific room or an open open space. The characteristics of the target audience refer to the relevant characteristics of the area range that the audio content needs to cover. In some embodiments, the characteristics of the target audience may include the number of listeners, the density of listeners, etc. In some embodiments, the characteristics of the target audience may also include the identity information of the target audience.

[0053] In some embodiments, the characteristics of the target audience can be obtained through a machine learning model. In some embodiments, the number of listeners and the density of listeners can be determined through a high-precision head and shoulder detection algorithm. In some embodiments, the facial information of the audience can also be determined through a face recognition algorithm, thereby determining the identity information of the audience.

[0054] Step 330, switching the type of working power amplifier in the broadcasting system based on the audio information of the input audio and the characteristics of the target audience within the broadcasting range. Step 330 can be performed by a dual power amplifier working switching module.

[0055] In some embodiments, when the characteristics of the target audience within the broadcast range meet the first preset condition and the audio characteristics of the input audio meet the second preset condition, the broadcast system switches the working amplifier to the first class amplifier. In some embodiments, the first class amplifier is a class AB amplifier. In some embodiments, the characteristics of the target audience within the broadcast range meet the first preset condition including the number or density of the target audience within the broadcast range exceeding a preset threshold (for example, the number of people is greater than 20 or the density of people is greater than 1 person per square meter). In some embodiments, the type of input audio meets the second preset condition that the input audio type is music and the sampling rate and bit rate of the audio exceed the preset threshold (for example, the audio sampling rate exceeds 44.1kHz and the bit rate exceeds 192kbps).

[0056] In some embodiments, when the characteristics of the target audience within the broadcast range meet the third preset condition or the type of input audio meets the fourth preset condition, the broadcast system switches the working amplifier to the second class amplifier. In some embodiments, the second class amplifier is a Class D amplifier. In some embodiments, the third preset condition includes the number or density of the target audience within the broadcast range exceeding a preset threshold (for example, the number is less than 5 people or the density of people is less than 0.1 people per square meter). In some embodiments, the type of input audio meets the fourth preset condition that the input audio type is human voice or ambient sound.

[0057] In some embodiments, the default working amplifier in the broadcasting system is a class AB working amplifier. In some embodiments, the type of the working amplifier in the broadcasting system can be switched based on preset conditions.

[0058] In some embodiments, if the identity information of the listeners within the broadcast range does not match the stored listener list, it means that there are no listeners with special listening needs within the broadcast range, and the working power amplifier can be switched to a Class D amplifier. In some embodiments, the working power amplifier can be switched when the input audio information meets the preset conditions. For example, when the audio content played is pure human voice, the working power amplifier can be switched to a Class D amplifier. For another example, when the sampling rate and bit rate of the audio content played are both lower than the preset threshold, the working power amplifier can also be switched to a Class D amplifier.

[0059] In some embodiments of the present specification, by combining audio content information and audience information of the broadcasting environment, the working amplifier in the dual-amplifier broadcasting system is switched to a Class D amplifier when preset conditions are met, which can reduce the workload of the Class AB amplifier in the broadcasting system, save energy consumption of the broadcasting system, and reduce the maintenance and repair costs of amplifier failures in the broadcasting system.

[0060] The basic concepts have been described above. Obviously, for those skilled in the art, the above detailed disclosure is only for example and does not constitute a limitation of this specification. Although not explicitly stated here, those skilled in the art may make various modifications, improvements and corrections to this specification. Such modifications, improvements and corrections are suggested in this specification, so such modifications, improvements and corrections still belong to the spirit and scope of the exemplary embodiments of this specification.

[0061] At the same time, this specification uses specific words to describe the embodiments of this specification. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of this specification. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more in different positions in this specification does not necessarily refer to the same embodiment. In addition, certain features, structures or characteristics in one or more embodiments of this specification can be appropriately combined.

[0062] In addition, unless explicitly stated in the claims, the order of the processing elements and sequences described in this specification, the use of alphanumeric characters, or the use of other names are not intended to limit the order of the processes and methods of this specification. Although the above disclosure discusses some invention embodiments that are currently considered useful through various examples, it should be understood that such details are only for illustrative purposes, and the attached claims are not limited to the disclosed embodiments. On the contrary, the claims are intended to cover all modifications and equivalent combinations that are consistent with the essence and scope of the embodiments of this specification. For example, although the system components described above can be implemented by hardware devices, they can also be implemented only by software solutions, such as installing the described system on an existing server or mobile device.

[0063] Similarly, it should be noted that in order to simplify the description disclosed in this specification and thus help understand one or more embodiments of the invention, in the above description of the embodiments of this specification, multiple features are sometimes combined into one embodiment, figure or description thereof. However, this disclosure method does not mean that the features required by the subject matter of this specification are more than the features mentioned in the claims. In fact, the features of the embodiments are less than all the features of the single embodiment disclosed above.

[0064] In some embodiments, numbers describing the number of components and attributes are used. It should be understood that such numbers used in the description of the embodiments are modified by the modifiers "about", "approximately" or "substantially" in some examples. Unless otherwise specified, "about", "approximately" or "substantially" indicate that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may change according to the required features of individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and adopt the general method of retaining digits. Although the numerical domains and parameters used to confirm the breadth of their range in some embodiments of this specification are approximate values, in specific embodiments, the setting of such numerical values ​​is as accurate as possible within the feasible range.

[0065] Each patent, patent application, patent application publication, and other materials, such as articles, books, specifications, publications, documents, etc., cited in this specification are hereby incorporated by reference in their entirety. Except for application history documents that are inconsistent with or conflicting with the contents of this specification, documents that limit the broadest scope of the claims of this specification (currently or later attached to this specification) are also excluded. It should be noted that if the descriptions, definitions, and / or use of terms in the materials attached to this specification are inconsistent or conflicting with the contents described in this specification, the descriptions, definitions, and / or use of terms in this specification shall prevail.

[0066] Finally, it should be understood that the embodiments described in this specification are only used to illustrate the principles of the embodiments of this specification. Other variations may also fall within the scope of this specification. Therefore, as an example and not a limitation, alternative configurations of the embodiments of this specification may be considered consistent with the teachings of this specification. Accordingly, the embodiments of this specification are not limited to the embodiments explicitly introduced and described in this specification.

Claims

1. A dual power amplifier operation switching method, characterized in that: The method comprises: Get the audio information of the input source input audio; Identify characteristics of the target audience within the speaker's broadcast range, including: Determine the number of listeners within the broadcast area; Determine whether there are listeners with specific listening needs within the broadcast range; Switching the type of working power amplifier in the broadcasting system based on the audio information of the input audio and the characteristics of the target audience within the broadcasting range includes: When the characteristics of the target audience within the broadcasting range meet the first preset condition and the audio characteristics of the input audio meet the second preset condition, the broadcasting system switches the working power amplifier to the first type of power amplifier, wherein the first preset condition is that the number or density of the target audience within the broadcasting range exceeds a preset threshold, and the second preset condition is that the input audio type is music and the sampling rate and bit rate of the audio exceed the preset threshold; When the characteristics of the target audience within the broadcasting range meet the third preset condition or the audio characteristics of the input audio meet the fourth preset condition, the broadcasting system switches the working amplifier to the second type of amplifier, wherein the third preset condition is that the number or density of the target audience within the broadcasting range is less than a preset threshold, and the fourth preset condition is that the input audio type is human voice or ambient sound.

2. The method according to claim 1, characterized in that The step of obtaining audio information of the input audio from the input source comprises: Acquire meta information of the input audio, the meta information including at least a sampling rate and a bit rate of the input audio; An audio classification and a probability thereof of the input audio are determined based on a machine learning model.

3. The method according to claim 1, characterized in that The first type of power amplifier is a class AB power amplifier, and the second type of power amplifier is a class D power amplifier.

4. A dual power amplifier working switching system, characterized in that: The system comprises: An audio information acquisition module is used to acquire the information of the input audio from the input source; A broadcast range audience information acquisition module is used to identify the characteristics of the target audience within the broadcast range of the speaker, wherein the characteristics of the target audience include: the number of audience members within the broadcast range and the identity information of the target audience; and The dual power amplifier working switching module is used to switch the type of working power amplifier in the broadcasting system based on the audio information of the input audio and the characteristics of the target audience in the broadcasting range, including: When the characteristics of the target audience within the broadcasting range meet the first preset condition and the audio characteristics of the input audio meet the second preset condition, the broadcasting system switches the working power amplifier to the first type of power amplifier, wherein the first preset condition is that the number or density of the target audience within the broadcasting range exceeds the preset threshold, and the second preset condition is that the input audio type is music and the sampling rate and bit rate of the audio exceed the preset threshold; When the characteristics of the target audience within the broadcasting range meet the third preset condition or the audio characteristics of the input audio meet the fourth preset condition, the broadcasting system switches the working amplifier to the second type of amplifier, wherein the third preset condition is that the number or density of the target audience within the broadcasting range is less than a preset threshold, and the fourth preset condition is that the input audio type is human voice or ambient sound.

5. The system according to claim 4, characterized in that The audio information acquisition module includes an audio file information acquisition unit and an audio content information determination unit.

6. The system according to claim 5, characterized in that The audio content information determination unit includes an audio content determination model.

7. The system according to claim 6, characterized in that The audio content determination model includes multiple CNN layers and linear layers, wherein the output of the CNN layer can be used as the input of the linear layer.

8. A dual power amplifier operation switching device, the device comprising at least one processor and at least one memory; The at least one memory is used to store computer instructions; The at least one processor is used to execute at least part of the computer instructions to implement the method for dual power amplifier operation switching as described in any one of claims 1-3.

9. A computer-readable storage medium, wherein the storage medium stores computer instructions. When a computer reads the computer instructions in the storage medium, the computer executes the method for switching dual power amplifier operations as described in any one of claims 1 to 3.

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