Audio processing circuit, system, and electronic device

Abstract

The application provides an audio processing circuit, system and electronic device, which can drive multiple loudspeakers in the electronic device to bring good auditory experience to a user. An input end of a power amplification module in the audio processing circuit is used for connecting a control chip to obtain an audio signal from the control chip, and an output end of the power amplification module is used for connecting a first loudspeaker to drive the first loudspeaker to sound by using the processed audio signal. Input ends of each voltage follower module in the audio processing circuit are connected with the output end of the power amplification module, and output ends of the voltage follower modules are used for connecting with one loudspeaker to obtain the audio signal from the power amplification module, and drive the one loudspeaker to sound after signal processing. In this way, the voltage follower module will not distort the audio signal received by each loudspeaker, so as to drive multiple loudspeakers in the electronic device to bring good auditory experience to a user.

Description

Technical Field

[0001] This application relates to the field of electronic equipment technology, and in particular to an audio processing circuit, system and electronic equipment. Background Technology

[0002] In the development of electronic devices, in scenarios such as making and receiving calls, playing music, watching videos, or making video or voice calls, electronic devices can drive speakers to produce sound through audio power amplifier modules (PA) to bring users a good auditory experience.

[0003] However, with the increasing number of speakers in electronic devices, how to drive multiple speakers in electronic devices to bring users a good auditory experience has become an urgent technical problem to be solved. Utility Model Content

[0004] To address the aforementioned technical problems, this application provides an audio processing circuit, system, and electronic device. The audio processing circuit provided in this application can incorporate a voltage follower module before each speaker. Because the voltage follower module has a high input impedance, it prevents voltage fluctuations in the audio signal output by the PA module, thus preventing distortion of the audio signal received by each speaker and improving the signal quality. This enables the device to drive multiple speakers in the electronic device to provide the user with a superior listening experience.

[0005] In a first aspect, this application provides an audio processing circuit applied to an electronic device. The electronic device includes N speakers, where N is greater than or equal to 2. The audio processing circuit includes: a power amplifier module, the input terminal of which is connected to a control chip, and the output terminal of which is connected to the first speaker; and N-1 voltage follower modules, wherein the input terminal of the i-th voltage follower module is connected to the output terminal of the power amplifier module, and the output terminal of the i-th voltage follower module is connected to the (i+1)-th speaker, where i is any positive integer greater than or equal to 1 and less than or equal to N-1.

[0006] Through the audio processing circuit, a voltage follower module can be set before each speaker. Because the voltage follower module has a high input impedance, it will not cause voltage fluctuations in the audio signal output by the PA module, so that the audio signal received by the first speaker will not be distorted. Furthermore, since the voltage follower module can amplify the received audio signal and its output impedance is low, it ensures that the audio signals received by each speaker connected to the voltage follower will not be distorted. This improves the signal quality of the audio signals received by each speaker, thereby driving multiple speakers in the electronic device to bring users a good listening experience.

[0007] In addition, the voltage follower module has lower cost and smaller size, saving on the cost and reducing the size of the audio processing circuit.

[0008] Furthermore, by using a voltage follower, the output power of the power amplifier module is not increased, thus avoiding the risk of overheating and improving the safety of the audio processing circuit. Additionally, the voltage follower module can be independently installed outside the PA module, avoiding safety issues caused by the PA module's inability to dissipate heat when externally located.

[0009] For example, the control chip can be a SOC chip.

[0010] In some embodiments, the power amplifier module can be used to receive audio signals sent by the control chip and amplify them before outputting them. For example, the power amplifier module may be... Figure 5 The audio PA module is shown. Optionally, the power amplifier module can be an audio PA chip. For example, an audio PA chip can output two square wave signals.

[0011] For example, the N-1 voltage follower modules can be the first voltage follower module 531 to the N-1th voltage follower module 53N-1 in the embodiments of this application.

[0012] For example, N can be an integer such as 2, 4, or 8.

[0013] For example, the number of power amplifier modules can be one.

[0014] According to the first aspect, the power amplifier module is used to output an audio signal, which includes a first level and a second level;

[0015] The i-th voltage follower module is used to acquire the audio signal, adjust the voltage of the first level to a preset voltage, and adjust the voltage of the second level to a reference voltage; and output the adjusted audio signal to the (i+1)-th speaker, where the preset voltage is greater than the reference voltage.

[0016] In this way, the voltage follower module can adjust the first level of the audio signal to a preset voltage and the second level to a reference voltage, ensuring that the audio signals output by each voltage follower module are not distorted, thereby ensuring the audio output quality of each speaker.

[0017] For example, the first level can be a high level and the second level can be a low level.

[0018] For example, the preset voltage can be a preset voltage VPP.

[0019] For example, the reference voltage can be a reference voltage value Vss, such as 0.

[0020] For example, the first voltage follower can output the adjusted audio signal to the second speaker, the second voltage follower can output the adjusted audio signal to the third speaker, ..., the (N-1)th voltage follower can output the adjusted audio signal to the Nth speaker.

[0021] For example, the audio signal received and the audio signal output by the voltage follower module are both square wave signals. In this way, the voltage follower module can directly process the square wave signal without analog-to-digital conversion, resulting in less signal distortion and lower background noise. This avoids poor audio signal quality caused by signal distortion and background noise in the output signal.

[0022] According to the first aspect, or any implementation of the first aspect above, the output terminal of the power amplifier module includes a negative output pin and a positive output pin. The negative output pin is used to output a first audio signal, and the positive output pin is used to output a second audio signal.

[0023] The input terminals of the i-th voltage follower module include a first input pin and a second input pin, and the output terminals of the i-th voltage follower module include a first output pin and a second output pin.

[0024] The i-th voltage follower module includes:

[0025] The first voltage follower includes a first input pin and a first output pin. The first input pin is connected to the negative output pin, and the first output pin is connected to the first input terminal of the i-th speaker.

[0026] The second voltage follower includes a second input pin and a second output pin. The second input pin is connected to the non-inverting output pin, and the second output pin is connected to the second input terminal of the i-th speaker.

[0027] In this way, the two signals output by the power amplifier module can be processed separately by two voltage followers, ensuring the signal quality of the two audio signals. This allows the two audio signals to be used to drive the speaker to produce a high-quality sound signal, thus improving the user's listening experience.

[0028] For example, the negative phase output pin can be the VON pin.

[0029] For example, the non-inverting output pin can be the VOP pin.

[0030] For example, the first audio signal may be a first square wave signal, and the second audio signal may be a second square wave signal.

[0031] For example, the first voltage follower is used to adjust the high level in the first audio signal to a preset voltage and to adjust the low level in the first audio signal to a reference voltage value Vss.

[0032] According to the first aspect, or any implementation thereof, the first audio signal includes a first level and a second level; the first voltage follower includes: a first switching unit, the control terminal of the first switching unit is connected to the negative output terminal, the first connection terminal of the first switching unit is used to connect to the power supply terminal, wherein the power supply terminal is used to provide a preset voltage, and the second connection terminal of the first switching unit is used to connect to the first input terminal of the i-th speaker; wherein, when the control terminal of the first switching unit receives the first level, the first connection terminal and the second connection terminal of the first switching unit are turned on; a first inverting unit, the input terminal of the first inverting unit is connected to the negative output terminal, the first inverting unit is used to receive the first audio signal, and to convert the first level in the first audio signal to the second level, and to convert the second level in the first audio signal to the first level; a second switching unit, the control terminal of the second switching unit is connected to the output terminal of the first inverting unit, the first connection terminal of the second switching unit is connected to the second connection terminal of the first switching unit, and the second connection terminal of the second switching unit is used to ground, wherein, when the control terminal of the second switching unit receives the first level, the first connection terminal and the second connection terminal of the second switching unit are turned on.

[0033] In this way, the high level in the first audio signal can be accurately adjusted to a preset voltage and the low level in the first audio signal can be accurately adjusted to a reference voltage value through switch control, so that the distortion of the adjusted audio signal is small, thereby ensuring the signal quality of the audio signal.

[0034] For example, the voltage value of the ground terminal voltage is the reference voltage value Vss.

[0035] According to the first aspect, or any implementation of the first aspect above, the first switching unit includes an NMOS transistor, and / or the second switching unit includes an NMOS transistor.

[0036] In this way, when the first audio signal is high, a preset voltage can be output by controlling the first switch unit to be turned on and the second switch unit to be turned off, and when the first audio signal is low, a reference voltage can be output by controlling the first switch unit to be turned off and the second switch unit to be turned on, thereby ensuring the signal quality of the output signal.

[0037] According to the first aspect, or any implementation of the first aspect above, the second audio signal includes a third level and a fourth level; the second voltage follower includes: a third switching unit, the control terminal of the third switching unit is connected to the non-inverting output terminal, the first connection terminal of the third switching unit is used to connect to the power supply terminal, wherein the power supply terminal is used to provide a preset voltage, and the second connection terminal of the third switching unit is used to connect to the second input terminal of the i-th speaker; wherein, when the control terminal of the third switching unit receives the third level, the first connection terminal and the second connection terminal of the third switching unit are turned on; a second inverting unit, the input terminal of the second inverting unit is connected to the non-inverting output terminal, the second inverting unit is used to receive the second audio signal, and to convert the third level in the second audio signal to the fourth level, and to convert the fourth level in the first audio signal to the third level; a fourth switching unit, the control terminal of the fourth switching unit is connected to the output terminal of the second inverting unit, the first connection terminal of the fourth switching unit is connected to the second connection terminal of the third switching unit, the second connection terminal of the fourth switching unit is used to ground, wherein, when the control terminal of the fourth switching unit receives the third level, the first connection terminal and the second connection terminal of the fourth switching unit are turned on.

[0038] In this way, the high level in the second audio signal can be accurately adjusted to a preset voltage and the low level in the second audio signal can be accurately adjusted to a reference voltage value through switch control, so that the distortion of the adjusted audio signal is small, thereby ensuring the signal quality of the audio signal.

[0039] For example, the third level can be a high level and the fourth level can be a low level.

[0040] According to the first aspect, or any implementation of the first aspect above, the third switching unit includes an NMOS transistor, and / or the fourth switching unit includes an NMOS transistor.

[0041] In this way, the high level in the second audio signal can be accurately adjusted to a preset voltage and the low level in the second audio signal can be accurately adjusted to a reference voltage value through switch control, so that the distortion of the adjusted audio signal is small, thereby ensuring the signal quality of the audio signal.

[0042] According to the first aspect, or any implementation of the first aspect above, the audio processing circuit further includes: a power supply module, including N power supply ports, wherein the first power supply port is the power supply port of the power amplifier module, the (i+1)th power supply port is the power supply port of the i-th voltage follower module, the power supply module is used to provide a preset voltage of the power amplifier module through the first power supply port, and the power supply module is also used to provide a preset voltage corresponding to the i-th voltage follower module through the (i+1)th power supply port.

[0043] In this way, the power supply module can provide a preset voltage to each voltage follower module, ensuring that the voltage follower module can independently obtain an accurate preset voltage.

[0044] For example, the power supply module can be a voltage supply module.

[0045] For example, the preset voltage values ​​of each voltage follower module can be the same or different.

[0046] According to the first aspect, or any implementation of the first aspect above, each voltage follower module corresponds to a preset voltage, wherein at least two of the preset voltages corresponding to the N-1 voltage follower modules and the preset voltages corresponding to the power amplifier module are different.

[0047] In this way, the volume of each speaker can be independently controlled by the power supply module by controlling the preset voltage, thereby enabling the speakers to produce different volumes of sound in different scenarios, meeting the sound playback needs of different scenarios, and further improving the user's auditory experience.

[0048] For example, at least two of the preset voltages VPP0, VPP1 to VPPN-1 have different voltage values.

[0049] According to the first aspect, or any implementation of the first aspect above, the power supply module is further configured to provide a preset voltage of a first voltage value to the i-th voltage follower module through the i+1 power supply port at a first moment, and is further configured to provide a preset voltage of a second voltage value to the i-th voltage follower module through the i+1 port at a second moment.

[0050] For example, the first time point and the second time point are different times.

[0051] For example, the first voltage value and the second voltage value are different values.

[0052] In this way, the power supply module can control the volume of the speakers at different times by changing the preset voltage value, which improves the control accuracy of the audio processing circuit and allows the volume of each speaker to be flexibly adjusted according to the user's needs at any time, further improving the user's listening experience.

[0053] According to the first aspect, or any implementation of the first aspect above, the power supply module is also used to provide a preset voltage of 0 to the i-th voltage follower module through the i+1-th port.

[0054] In this way, by providing a preset voltage of 0, the sound of each speaker can be turned off in time, thereby enabling accurate sound control of each speaker and further improving the user's auditory experience.

[0055] Secondly, embodiments of this application provide an audio processing system, which includes: an audio processing circuit and a control chip as described in the first aspect or any possible implementation of the first aspect.

[0056] The second aspect and any implementation thereof correspond to the first aspect and any implementation thereof, respectively. The technical effects corresponding to the second aspect and any implementation thereof are similar to those corresponding to the first aspect and any implementation thereof, and will not be repeated here.

[0057] Thirdly, this application provides an electronic device, including an audio processing circuit, a control chip, and N speakers as described in the first aspect or any possible implementation of the first aspect.

[0058] The third aspect and any implementation thereof correspond to the first aspect and any implementation thereof, respectively. The technical effects corresponding to the third aspect and any implementation thereof are similar to those corresponding to the first aspect and any implementation thereof, and will not be repeated here.

[0059] It should be understood that the descriptions of technical features, technical solutions, beneficial effects, or similar language in this application do not imply that all features and advantages can be achieved in any single embodiment. Rather, it is understood that the description of a feature or beneficial effect means that a specific technical feature, technical solution, or beneficial effect is included in at least one embodiment. Therefore, the descriptions of technical features, technical solutions, or beneficial effects in this specification do not necessarily refer to the same embodiment. Furthermore, the technical features, technical solutions, and beneficial effects described in this embodiment can be combined in any suitable manner. Those skilled in the art will understand that embodiments can be implemented without one or more specific technical features, technical solutions, or beneficial effects of a particular embodiment. In other embodiments, additional technical features and beneficial effects may be identified in specific embodiments that do not embody all embodiments. Attached Figure Description

[0060] Figure 1A This is an illustrative diagram of an application scenario;

[0061] Figure 1B This is an illustrative diagram of another application scenario.

[0062] Figure 2 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application;

[0063] Figure 3This is a schematic diagram of an exemplary audio processing circuit;

[0064] Figure 4 An exemplary schematic diagram of an audio processing circuit in a related art is shown;

[0065] Figure 5 This paper shows a schematic diagram of the structure of an audio processing circuit provided in an embodiment of this application;

[0066] Figure 6 A schematic diagram of an exemplary audio signal provided in an embodiment of this application is shown;

[0067] Figure 7 A schematic diagram of an exemplary audio PA chip provided in an embodiment of this application is shown;

[0068] Figure 8 This paper shows a schematic diagram of the structure of a voltage follower module provided in an embodiment of this application;

[0069] Figure 9 This paper shows a schematic diagram of the structure of a voltage follower module provided in an embodiment of this application;

[0070] Figure 10 This paper shows a schematic diagram illustrating the working principle of a voltage follower module provided in an embodiment of this application.

[0071] Figure 11 This paper shows a schematic diagram of another voltage follower module provided in an embodiment of this application;

[0072] Figure 12 A schematic diagram of an exemplary Class-D amplifier provided in an embodiment of this application is shown;

[0073] Figure 13 A schematic diagram of another audio processing circuit provided in an embodiment of this application is shown;

[0074] Figure 14 A schematic diagram of another audio processing circuit provided in an embodiment of this application is shown;

[0075] Figure 15 This invention provides a schematic diagram of the structure of a first control switch.

[0076] Figure 16 A schematic diagram of another audio processing circuit provided in an embodiment of this application is shown. Detailed Implementation

[0077] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0078] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone.

[0079] The terms "first" and "second," etc., used in the specification and claims of this application are used to distinguish different objects, not to describe a specific order of objects. For example, "first target object" and "second target object," etc., are used to distinguish different target objects, not to describe a specific order of target objects.

[0080] In the embodiments of this application, directional terms such as "up," "down," "left," and "right" may include, but are not limited to, the orientation relative to the schematic placement of the components in the accompanying drawings. It should be understood that these directional terms can be relative concepts, used for relative description and clarification, and can change accordingly based on the orientation of the components in the accompanying drawings.

[0081] In the embodiments of this application, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a direct connection or a connection through an intermediate medium. Furthermore, the term "coupled" can refer to an electrical connection method for achieving signal transmission.

[0082] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0083] In the description of the embodiments in this application, unless otherwise stated, "multiple" means two or more. For example, multiple processing units means two or more processing units; multiple systems means two or more systems.

[0084] Furthermore, in the embodiments of this application, the control terminal of each transistor is the gate of the transistor, the first connection terminal is one of the source and drain of the transistor, and the second connection terminal is the other of the source and drain of the transistor. Since the source and drain of the transistor can be symmetrical in structure, their source and drain can be structurally indistinguishable.

[0085] With the rapid development of electronic devices, such as mobile phones and tablets, users have greatly benefited from improved audio experiences in various daily scenarios, including making and receiving calls, listening to music, watching videos, and participating in video conferences. For example, Figure 1A This is an illustrative diagram illustrating one application scenario. For example... Figure 1A As shown, in a mobile phone call scenario, when user P1's ear is close to mobile phone 100, mobile phone 100 generates sound, which is then transmitted to user P1's ear through the air. For example, Figure 1B This is an example illustration of another application scenario. Figure 1B As shown, when user P1 makes a video call using mobile phone 100, mobile phone 10 can transmit sound to user P1's ear through the air.

[0086] Before introducing the technical solutions of the embodiments of this application, the electronic devices of the embodiments of this application will be described below. The electronic devices of the embodiments of this application can be electronic devices with multiple speakers. In one scenario, the electronic device can be a tablet computer, television, or other electronic device including four or more speakers. In another scenario, the electronic device can also be a mobile phone including two speakers (it should be noted that, depending on the actual situation and specific needs, the mobile phone can also include more speakers, and there is no specific limitation on this). Furthermore, the electronic device can also include, but is not limited to, laptops, in-vehicle computers, smart wearable devices (such as smartwatches or smart bracelets), smart home devices (such as Bluetooth speakers), dashcams, security equipment, and other electronic devices including two or more speakers. The embodiments of this application do not specifically limit the specific type of the above-mentioned electronic devices. For ease of explanation, the hardware structure of the electronic device will be described below using a tablet computer as an example.

[0087] Figure 2 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application.

[0088] in, Figure 2 (1) is a schematic diagram of the front structure of the electronic device. Figure 2 (2) is a schematic diagram of the rear structure of the electronic device. For example... Figure 2 As shown, the electronic device includes a display module 10, a back cover (also known as a battery cover) 20, and a mid-frame 30.

[0089] The display module 10 includes a cover plate and a display screen stacked together. The cover plate, for example, protects the display screen. The display screen includes, for example, a liquid crystal display (LCD), an organic light-emitting diode (OLED) display screen, and an LED display screen, wherein the LED display screen includes, for example, a micro-LED display screen and a mini-LED display screen. This application embodiment does not limit the type of display screen.

[0090] The material of the back cover 20 may include, for example, opaque materials such as plastic, vegan leather, and fiberglass; or it may include translucent materials such as glass. This application does not limit the material of the back cover 20.

[0091] The mid-frame 30 includes a ring-shaped outer component 31 and a support component (not shown) located within the ring-shaped outer component 31 and between the display module 10 and the back cover 20. A charging port 70 is also provided on the mid-frame. The charging port 70 can be an interface conforming to USB standards, specifically a Mini USB interface, a Micro USB interface, a USB Type-C interface, etc. In this embodiment, the charging port 70 can be used to connect a charger for forward charging of the electronic device; it can be used for reverse charging of other devices by the electronic device; it can be used for data transmission between the electronic device and peripheral devices; and it can also be used to connect headphones for audio playback. This interface can also be used to connect other electronic devices, such as AR devices.

[0092] The display module 10, the back cover (also known as the battery cover) 20, and the annular outer part 31 surround a housing cavity, within which are housed a battery, a printed circuit board (PCB) 40, and functional components 50, among other structures. Figure 2 (Not shown in the image), the functional device 50 includes a first functional component and a second functional component. The first functional component may be disposed on PCB 40 and electrically connected to PCB 40; the second functional component is not disposed on the PCB, but is electrically connected to PCB 40. The first functional component may include a processor, a power supply module (such as a power management chip and / or a charging management module), a display driving circuit, and a measurement circuit, etc., and the second functional component may include a flash, a camera 55, etc. In the embodiments of this application, the first functional component may also include a main control chip, a PA module, and N-1 voltage follower modules, and the second functional component may also include N speakers (N can be any integer greater than or equal to 2, such as...). Figure 2The four speakers (51-54) are located within the enclosure. It should be noted that the speakers can also be mounted on the PCB 40; there are no specific restrictions on this. All components are electrically connected via the PCB 40, thereby enabling signal transmission and interaction. The support structure provides support for some of the structures within the enclosure.

[0093] The processor may include one or more processing units, such as a baseband processor, application processor (AP), modem processor, graphics processing unit (GPU), image signal processor (ISP), controller, memory, video codec, digital signal processor (DSP), and / or neural network processing unit (NPU). Different processing units may be independent devices or integrated into one or more processors.

[0094] The processor may include a memory for storing instructions and data. In some embodiments, the memory in the processor is a cache memory. This memory can store instructions or data that the processor has just used or that are used repeatedly. If the processor needs to use the instruction or data again, it can directly retrieve it from the memory. This avoids repeated accesses, reduces processor waiting time, and thus improves system efficiency. In this embodiment, the memory may store compressed data that needs to be stored and sent by the measurement circuit.

[0095] In some embodiments, the processor may include one or more interfaces. Interfaces may include inter-integrated circuit (I2C) interfaces, serial peripheral interfaces (SPI), inter-integrated circuit sound (I2S) interfaces, pulse code modulation (PCM) interfaces, universal asynchronous receiver / transmitter (UART) interfaces, mobile industry processor interfaces (MIPI), general-purpose input / output (GPIO) interfaces, subscriber identity module (SIM) interfaces, and / or universal serial bus (USB) interfaces, etc.

[0096] The I2C interface is a bidirectional synchronous serial bus, including a serial data line (SDA) and a serial clock line (SCL). In some embodiments, the processor may include multiple I2C buses. The processor can couple to a flash, camera 55, etc., through different I2C bus interfaces. In this embodiment, the processor can couple to a measurement circuit through the I2C interface, enabling the processor and the measurement circuit to communicate through the I2C bus interface, thereby realizing the detection function of the electronic device 100.

[0097] The charging management module receives charging input from the charger, which can be either a wireless or wired charger. While charging the battery, the charging management module can also supply power to the electronic device via the power management module.

[0098] The power management module connects the battery, the charging management module, and the processor. It receives input from the battery and / or the charging management module to power the processor, display screen, camera 55, speakers 51-54, main control chip, and other components. In some embodiments, the power management module may be located within the processor. In other embodiments, the power management module and the charging management module may be located in the same device. The display driver circuit drives the display screen to display images or videos, etc.

[0099] Camera 55 is used to capture still images or videos. An object is projected onto a photosensitive element by an optical image generated through a lens. The photosensitive element can be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS) phototransistor. The photosensitive element converts the light signal into an electrical signal, which is then passed to an ISP for conversion into a digital image signal. The ISP outputs the digital image signal to a DSP for processing. The DSP converts the digital image signal into image signals in standard RGB, YUV, or other formats. In some embodiments, the electronic device may include one or more cameras. A flash is used to provide supplemental lighting for camera 55.

[0100] It is understood that the above description only schematically illustrates some of the components included in an electronic device. Actual electronic devices may have more or fewer components than those described above, or combine or separate certain components, or have different component arrangements. The illustrated components can be implemented in hardware, software, or a combination of both.

[0101] It should be noted that, Figure 2 In this embodiment, the electronic device is shaped like a rectangular flat plate. In other alternative embodiments, the electronic device can also be square, circular, elliptical, or similar shapes. Of course, the electronic device can also be a foldable electronic device.

[0102] After introducing the hardware structure of the electronic device, since the electronic device can generate sound through the internal audio processing circuit, the audio processing circuit involved in the embodiments of this application will be described next.

[0103] For example, Figure 3 This is a schematic diagram of an exemplary audio processing circuit. Figure 3 As shown, the audio processing circuit 300 may include a main control chip 310, a power amplifier (PA) module 320, and a speaker 330. Exemplarily, the main control chip 310 may be implemented as a system-on-a-chip (SOC).

[0104] In an audio playback scenario, continue with Figure 3 Taking the audio processing circuit shown as an example, the main control chip 310 can process the audio signal and send the processed audio signal to the PA module 320. After the PA module 320 amplifies the audio signal, it sends the amplified audio signal to the speaker 330 to drive the speaker 330 to vibrate according to the audio signal and produce a sound that can be heard by the human ear.

[0105] However, the inventors discovered that with the rapid development of audio technology in electronic devices, multiple speakers are often installed on an electronic device to meet the diverse auditory needs of users. In one example, as described above... Figure 2 The illustrated electronic devices, such as tablets, computers, or televisions, may have four, eight, or more speakers. For example, taking a tablet as an example, the tablet may include a speaker for playing left channel sound and a speaker for playing right channel sound. The left and right channel speakers may each include at least one speaker (e.g., one or two speakers) for playing high-frequency sounds and at least one speaker (e.g., one or two speakers) for playing low-frequency sounds. In another example, taking a mobile phone as an example, the mobile phone may include a first speaker (upper speaker or upper BOX, i.e., a speaker near the top of the phone) and a second speaker (lower speaker or lower BOX, i.e., a speaker closer to the bottom of the phone than the upper speaker). Alternatively, the mobile phone may include more speakers depending on actual needs; this application embodiment does not impose specific limitations on this.

[0106] However, with the increasing number of speakers, how to drive multiple speakers in electronic devices has become a pressing technical problem.

[0107] In one related technology, Figure 4 An exemplary schematic diagram of an audio processing circuit in a related art is shown. Figure 4 As shown, in the case where the electronic device includes four speakers, the audio processing circuit of the electronic device may include a main control chip 410, a PA module 421, and the first speaker 431 to the fourth speaker 434.

[0108] The main control chip 410 is connected to one end of the PA module 421. The other end of the PA module 421 is connected to the first speaker 431 to the fourth speaker 434 respectively.

[0109] However, the inventors discovered through research that due to limitations in the maximum output power of the PA module or the minimum impedance of the PA module to the speakers, a single PA module often cannot drive two or more speakers. Specifically, in this approach, because the impedance of the speakers is too low, a loop can be formed between the PA module and each speaker. The voltage distributed across each loop by the PA module fluctuates, causing distortion of the audio signals received by each speaker and affecting the sound quality. Furthermore, because the impedance of each speaker is too low, the current in each loop is often large, leading to excessive output current and thus excessive overall output power of the PA module. This results in the PA module's output power exceeding its maximum output power limit, causing the PA module to heat up rapidly and easily burn out, compromising the safety of the audio processing circuitry.

[0110] To address one of the aforementioned problems, this application provides an audio processing circuit. By placing a voltage follower module before each speaker, the voltage follower module, due to its high input impedance, prevents voltage fluctuations in the audio signal output by the PA module, thus preventing audio signal distortion and improving sound quality. Furthermore, because the voltage follower module has low output impedance, it does not affect the signal quality of its output audio signal, avoiding audio signal distortion and further improving sound quality. Moreover, the low current flow in the line between the PA module and the voltage follower module avoids the risk of overheating in the PA module due to high power transmission, improving the safety of the audio processing circuit.

[0111] Next, combined Figures 5-16 The audio processing circuit provided in the embodiments of this application will be described.

[0112] Figure 5 A schematic diagram of an audio processing circuit provided in an embodiment of this application is shown. Figure 5 As shown, the audio processing circuit 500 provided in this embodiment may include a main control chip 510, an audio PA module 520, N-1 voltage follower modules (i.e., first voltage follower module 531 to N-1 voltage follower module 53N-1) and N speakers (first speaker 541 to Nth speaker 542). Wherein, N is an integer greater than or equal to 2.

[0113] The main control chip 510 is used to process audio signals and output the processed audio signals. In this embodiment, the main control chip 510 can be implemented as a System-on-a-Chip (SoC).

[0114] The audio PA module 520 has a negative phase output (VON) and a positive phase output (VOP). In this embodiment, the audio PA module 520 is used to output a power-amplified audio signal. In some embodiments, the audio signal may include two square wave signals. Exemplarily, the audio signal may be an audio signal in Class-D signal format.

[0115] In one example Figure 6 A schematic diagram of an exemplary audio signal provided in an embodiment of this application is shown. For example... Figure 6 As shown, the VON pin can output a first square wave signal N11, and the VOP pin can output a second square wave signal P11. The first square wave signal N11 and the second square wave signal P11 have a first phase difference.

[0116] Furthermore, the high level of the first square wave signal N11 and the high level of the second square wave signal P11 both have a first voltage value VPP0, and the high level of the first square wave signal N11 and the low level of the second square wave signal P11 both have a second voltage value Vg. The first voltage value VPP0 is greater than the second voltage value Vg. The second voltage value Vg can be a ground voltage, such as 0V.

[0117] After introducing the audio signal, we will now continue to explain the structure of the audio PA module 520.

[0118] In this embodiment, the audio PA module 520 can be implemented as an audio PA chip. In some embodiments, the audio PA module 520 can be an audio PA chip capable of outputting two square wave signals. Exemplarily, the audio PA chip can include a Class-D amplifier to output audio signals in Class-D signal format.

[0119] In one example, the final stage of the audio PA chip could be a Class-D amplifier, for example... Figure 7 The audio PA chip in it is 520A. Specifically, Figure 7 A schematic diagram of an exemplary audio PA chip provided in an embodiment of this application is shown. Figure 7As shown, the audio PA520A chip may include a Digital Audio Interface 5201, a Digital Audio Processing path 5202, a Digital-to-Analog Converter (DAC) 5203, a Class-D Amplifier 5204, a First Analog-to-Digital Converter (ADC) 5205, a Current & Voltage Sense Processing module 5206, a Temperature Monitor 5207, a Second ADC 5208, a Multiplexer (MUX) 5209, a Phase-Locked Loop (PLL) 5210, and I... 2 C interface (I 2 The audio PA chip may also include an overvoltage protection module (OVP), an overcurrent protection module (OCP), and an overtemperature protection module (OCP). (C Interface) 5211, Charge Pump 5212, Boost Circuit 5213.

[0120] In addition, the audio PA chip may also include: a serial data line (SDA) pin, a serial clock line (SCA) pin, an interrupt (INTN) pin, an address selection (AD1 / 2) pin, a digital power (DVDD) pin, a serial clock (BCK) pin, a frame clock (WCK) pin, a serial data (DATAI) pin, a signal return (DATAO) pin, a test 1 (TEST1) pin, a test 2 (TEST2) pin, a test 3 (TEST3) pin, a voltage output regulation pin (VREG), a power supply (PVDD) pin, a negative phase output (VON), a positive phase output (VOP), a power supply (VDD) pin, a switch control (SW) pin, a drive (VBST) pin, a digital ground (DGND) pin, a bus ground (BGND) pin, and a power ground (PGND) pin.

[0121] In the embodiments of this application, Figure 7 The Class-D amplifier 5204 of the audio PA chip 520A shown can output a first square wave signal through the VON pin, and the Class-D amplifier 5204 can also output a second square wave signal through the VOP pin.

[0122] It should be noted that the audio PA module can also be implemented as other PA chips capable of outputting two square wave chips, and there are no restrictions on its specific structure.

[0123] After introducing the structure of the audio PA module, the connection relationships of the audio PA module 520 will be explained next. See also... Figure 5 The VON pin of the audio PA module 520 is connected to the first connection terminal of the first speaker 541, and the VOP pin of the audio PA module 520 is connected to the second connection terminal of the first speaker 541.

[0124] Furthermore, on the connection line between the VON pin and the first connection terminal of the first speaker 541, there are connection points A1 to AN-1. Specifically, the i-th connection point Ai among connection points A1 to AN-1 is used to connect to the first connection terminal of the i-th voltage follower module 53i to output a first square wave signal to the i-th voltage follower module 53i, where i is any positive integer greater than or equal to 1 and less than or equal to N-1. It should be noted that the VON pin can also be directly connected to the first connection terminal of each voltage follower module, without specific restrictions.

[0125] Furthermore, the connection line between the VOP pin and the second connection terminal of the first speaker 541 also has connection points BV1 to BN-1. Specifically, the i-th connection point Bi among connection points BV1 to BN-1 is used to connect to the second connection terminal of the i-th voltage follower module 53i to output a second square wave signal to the i-th voltage follower module 53i. It should be noted that the VOP pin can also be directly connected to the second connection terminal of each voltage follower module, without specific restrictions.

[0126] After introducing the audio PA module 520, we will now continue with the explanation of the voltage follower module.

[0127] For the i-th voltage follower module 53i (i.e., any one of the first voltage follower modules 531 to the (N-1)-th voltage follower modules 53N-1), it is used to amplify the power of the received audio signal. In this embodiment, the i-th voltage follower module 53i can adjust the high level in the received audio signal to a preset voltage VPP, and adjust the low level in the received audio signal to a reference voltage value Vss. The reference voltage value can be the ground voltage Vss, i.e., 0V.

[0128] In some embodiments, Figure 8 A schematic diagram of a voltage follower module provided in an embodiment of this application is shown. Figure 8 As shown, the voltage follower module 53i may include a first voltage follower 53i1 and a second voltage follower 53i2.

[0129] The first voltage follower 53i1 is used to amplify the power of the first square wave signal A11 to obtain the amplified first square wave signal A12. The high-level voltage value of the amplified first square wave signal A12 is adjusted to a preset voltage VPP, and the low-level voltage value of the amplified first square wave signal A12 is adjusted to a reference voltage value Vss.

[0130] The second voltage follower 53i2 is used to amplify the power of the second square wave signal B11 to obtain the amplified second square wave signal B12. The high-level voltage value of the amplified second square wave signal B12 is adjusted to a preset voltage VPP, and the low-level voltage value of the amplified first square wave signal A12 is adjusted to a reference voltage value Vss.

[0131] In one example Figure 9 A schematic diagram of a voltage follower module provided in an embodiment of this application is shown. Figure 9 As shown, the first voltage follower 53i1 and the second voltage follower 53i2 can have the same structure. The following explanation will take the first voltage follower 53i1 as an example.

[0132] The first voltage follower 53i1 may include an inverting unit D1, a first switching unit N1, and a second switching unit N2. The VON interface is connected to both the input terminal of the inverting unit D1 and the control terminal of the first switching unit N1. The output terminal of the inverting unit D1 is connected to the control terminal of the second switching unit N1. The first connection terminal of the first switching unit N1 is used to receive a preset voltage VPP. The second connection terminal of the first switching unit N1 is connected to the first connection terminal of the second switching unit N2, and the second connection terminal of the second switching unit N2 is grounded (GND). Furthermore, the second connection terminal of the first switching unit N1 is also connected to the first input terminal of the i-th speaker to output an amplified first square wave signal to the i-th speaker.

[0133] The inverting unit D1 is used to convert a high level to a low level and vice versa.

[0134] For the first switching unit N1, when its control terminal receives a high-level signal, the first connection terminal and the second connection terminal of the first switching unit N1 are turned on; and when the control terminal of the first switching unit N1 receives a low-level signal, the first connection terminal and the second connection terminal of the first switching unit N1 are turned off. For example, the first switching unit N1 can be implemented as an NMOS transistor. Accordingly, the control terminal of the first switching unit N1 can be the gate (G) of the NMOS transistor, the first connection terminal of the first switching unit N1 can be the drain (D) of the NMOS transistor, and the second connection terminal of the first switching unit N1 can be the source (S) of the NMOS transistor. It should be noted that the first switching unit N1 can also be implemented as other switching devices that can be turned on under a high-level drive, which will not be elaborated further.

[0135] Furthermore, the second switching unit N2 is similar to the first switching unit N1, and its details can be found in the above description of the first switching unit N1, which will not be repeated here.

[0136] After introducing the structure of the first voltage follower 53i1, the working principle of the first voltage follower 53i1 will be explained in conjunction with the accompanying drawings.

[0137] Figure 10 A schematic diagram illustrating the working principle of a voltage follower module provided in an embodiment of this application is shown. Figure 10 As shown, if the input signal is high at time T1 and low at time T2.

[0138] At time T1, the working principle of the first voltage follower 53i1 is as follows: Figure 10As shown in (1), the control terminal of the first switching unit N1 is at a high level, and the first connection terminal and the second connection terminal of the first switching unit N1 are connected. However, the input high-level signal is converted to a low level by the inverting unit D1 and then output to the control terminal of the second switching unit N2, and the first connection terminal and the second connection terminal of the second switching unit N2 are disconnected.

[0139] At this time, the circuit between node P2 (located at the second connection terminal of the first switching unit N1) and node P3 (located at the first connection terminal of the second switching unit N2) is essentially open. The voltages of node P1 (located at the first connection terminal of the first switching unit N1) and node P2 are both the preset voltage VPP, and the voltage of node P3 is the reference voltage value Vss. Correspondingly, a high level can be output from node P2, wherein the voltage value of the output high level is equal to the preset voltage VPP.

[0140] And, at time T2, the operating principle of the first voltage follower 53i1 is as follows: Figure 10 As shown in (2), the control terminal of the first switching unit N1 is at a low level, and the first connection terminal and the second connection terminal of the first switching unit N1 are disconnected. Furthermore, the input low-level signal is converted to a high level by the inverting unit D1 and then output to the control terminal of the second switching unit N2, and the first connection terminal and the second connection terminal of the second switching unit N2 are connected.

[0141] At this point, the circuit between nodes P1 and P2 is essentially open, and the voltages of nodes P2 and P3 are both the reference voltage value Vss. Accordingly, a low level can be output from node P2, where the voltage value of the output low level is equal to the reference voltage value Vss.

[0142] Therefore, after processing by the first voltage follower 53i1, the high-level voltage of the first square wave signal output by the first voltage follower 53i1 can be adjusted to a preset voltage VPP, and the low-level voltage of the output first square wave signal is adjusted to a reference voltage value Vss.

[0143] It should be noted that, Figures 9-10 The first voltage follower 53i1 shown is low in cost and can utilize the switching characteristics of the class-D signal to make the amplified audio signal have low noise floor and low signal distortion, thereby further improving the sound quality of the audio signal and reducing circuit cost.

[0144] Furthermore, it should be noted that the voltage follower in the embodiments of this application can also be implemented as other circuits, modules or devices that use switching units for signal modulation, and no specific limitations are imposed in this regard.

[0145] In another example, Figure 11A schematic diagram of another voltage follower module provided in an embodiment of this application is shown. The first voltage follower 53i1 and the second voltage follower 53i2 can have the same structure. The following description takes the first voltage follower 53i1 as an example.

[0146] like Figure 11 As shown, the first voltage follower 53i1 may include an operational amplifier AMP1. The positive input terminal of the operational amplifier AMP1 (indicated by + in the figure) is connected to the VON interface to receive a first square wave signal; the negative input terminal of the operational amplifier AMP1 (indicated by - in the figure) is grounded to GND; the positive power input terminal of the operational amplifier AMP1 is used to receive a preset voltage VPP; the negative power input terminal of the operational amplifier AMP1 is used to receive a reference voltage value Vss, for example, the negative power input terminal can be grounded to GND; the output terminal of the operational amplifier AMP1 is connected to the first input terminal of the i-th speaker.

[0147] pass Figure 11 The circuit structure shown has the following characteristics: when the input signal at the positive input terminal of operational amplifier AMP1 is high, the output terminal of operational amplifier AMP1 outputs a high-level signal, wherein the voltage value of the output high-level signal is a preset voltage VPP; and when the input signal at the positive input terminal of operational amplifier AMP1 is low, the output terminal of operational amplifier AMP1 outputs a low-level signal, wherein the voltage value of the output low-level signal is a reference voltage value Vss.

[0148] It should be noted that, Figure 11 The first voltage follower 53i1 shown can feature low noise floor, low cost, and low signal distortion, which can further improve the sound quality of audio signals and reduce circuit costs. Furthermore, the applicant needs to clarify that... Figure 9 The first voltage follower 53i1 shown is compared to Figure 11 The first voltage follower 53i1 shown has a lower noise floor, which can further improve the quality of the audio signal.

[0149] It should also be noted that the first voltage follower 53i1 can also be implemented as other voltage follower circuits capable of outputting a high-level voltage as a preset voltage VPP and a low-level voltage as a reference voltage value Vss, and its circuit structure is not specifically limited. Furthermore, since the second voltage follower 53i2 has a similar structure to the first voltage follower 53i1, its description can be found in the above section regarding the first voltage follower 53i1, and will not be repeated here.

[0150] After introducing the voltage follower module, we will now move on to the speaker.

[0151] The first speaker 541 has a first input terminal and a second input terminal. (See also...) Figure 5 The first input terminal of the first speaker 541 is connected to the VON pin of the audio PA module 520 to receive a first square wave signal. The first input terminal of the first speaker 541 is connected to the VOP pin of the audio PA module 520 to receive a second square wave signal. The first speaker 541 can generate sound under the combined drive of the first and second square wave signals.

[0152] For any one of the following loudspeakers (i.e., the second to the (N-1)th loudspeakers), its first input terminal is connected to the output terminal of the first voltage follower 53i1 in the i-th voltage follower module 53i to acquire the amplified first square wave signal. The second input terminal of the i-th loudspeaker is connected to the output terminal of the second voltage follower 53i2 in the i-th voltage follower module 53i to acquire the amplified second square wave signal. The i-th loudspeaker 54i can generate sound under the combined drive of the first and second square wave signals.

[0153] The audio processing circuit provided in this application embodiment allows each voltage follower module to amplify the audio signal output from the audio PA module and drive each speaker, thereby enabling simultaneous driving of multiple speakers in the electronic device. Furthermore, because each voltage follower module has high input impedance, it does not affect voltage fluctuations on the transmission line between the PA module and the first speaker, ensuring the quality of the audio signal received by each speaker. Additionally, because the output impedance of the voltage follower modules is low, it does not affect the signal quality of the output audio signal, ensuring that the audio signal received by each speaker is not distorted, thus improving the sound quality of the sound played by multiple speakers.

[0154] Furthermore, because the input impedance of the voltage follower module is relatively high, no large current will be generated on the transmission line where each voltage follower module is located, thus avoiding the risk of overheating caused by excessive output current of the audio PA module.

[0155] Furthermore, compared to other power amplifier modules, the voltage follower module of this application can directly process digital audio signals without analog-to-digital conversion. Moreover, the voltage follower module can directly process voltage signals, thus eliminating the need for current signal sampling circuitry. In addition, the voltage follower module of this application avoids the signal distortion and noise floor issues inherent in power amplifier modules, and is also lower in cost. Therefore, the audio processing circuit of this application features low cost, low signal distortion and noise floor, no need for additional sampling circuitry, and low signal delay, thereby further improving the quality of the audio signal.

[0156] Furthermore, it should be noted that this application eliminates the need for a separate PA circuit for each speaker, thus saving on PA circuit setup costs. And, Figure 12 This diagram illustrates an exemplary Class-D amplifier according to an embodiment of this application. The Class-D amplifier may include: an error amplifier 6141, a triangle wave generator 6142, a comparator 6143, a dead time control module 6144, a level shifter 6145, a first NMOS transistor NMOS01 and a second NMOS transistor NMOS02, a filter inductor L1, and a filter capacitor C1. Figure 12 As can be seen, the voltage follower module in this embodiment corresponds only to the first region (shown in gray) of the Class-D amplifier in the PA module, thereby greatly reducing the area of ​​the audio processing circuit and avoiding waste of the PA module's function and structure. Furthermore, compared to the first region in the Class-D amplifier, the voltage follower module in this application is independently located outside the PA chip, resulting in faster heat dissipation and avoiding safety issues caused by overheating of the PA module.

[0157] Based on the same inventive concept Figure 13 A schematic diagram of another audio processing circuit provided in an embodiment of this application is shown. Figure 5 The difference in the audio processing circuit shown is that, Figure 13 The audio processing circuit 500 shown may also include a voltage supply module 550 (which may also be referred to as a power supply module in this application).

[0158] The voltage supply module 550 may include N power supply ports, each connected to the power supply port of a voltage follower module. For example, the first power supply port is connected to the power supply port of the first voltage follower module 531, the second power supply port is connected to the power supply port of the second voltage follower module 532, ..., the (N-1)th power supply port is connected to the power supply port of the (N-1)th voltage follower module 53N-1. In this embodiment, the voltage supply module 550 can provide a first preset voltage VPP1 to the first voltage follower module 531, a second preset voltage VPP2 to the second voltage follower module 532, ..., and a second preset voltage VPPN-1 to the (N-1)th voltage follower module 53N-1. Optionally, the voltage supply module 550 may further include an Nth power supply port connected to the power supply port of an audio PA module, which can provide a preset voltage VPP0 to the audio PA module. In some embodiments, the multiple preset voltage values ​​output by the voltage supply module 550 may be the same. For example, the first preset voltage VPP1 to the (N-1)th preset voltage VPPN-1 are the same, such as all being the same value as the preset voltage VPP0.

[0159] In other embodiments, at least two of the multiple preset voltage values ​​may be different.

[0160] In one example, voltage supply module 550 can provide a first preset voltage to the voltage follower module connected to the tweeter (i.e., the speaker emitting high frequencies) and a second preset voltage to the voltage follower module connected to the woofer (i.e., the speaker emitting low frequencies), wherein the first and second values ​​are different. In this way, the audio processing circuit can control the tweeter and woofer to emit sounds at different volumes, thereby enabling independent volume control of high and low frequencies in the electronic device.

[0161] In another example, the voltage supply module 550 can provide a third preset voltage to the voltage follower module connected to the left channel speaker, and a fourth preset voltage to the voltage follower module connected to the right channel speaker, wherein the third and fourth values ​​are different. In this way, the audio processing circuit can control the left and right channel speakers to emit sounds at different volumes, allowing the electronic device to perform independent volume control on the left and right channels.

[0162] In yet another example, the voltage supply module 550 can configure the preset voltage of one or more voltage follower modules to 0. In this way, the voltage supply module 550 can mute the sound from the speakers connected to the one or more voltage follower modules.

[0163] The voltage supply module 550 allows for independent volume control of each speaker by controlling the preset voltage value, thereby improving the audio playback quality of the electronic device.

[0164] Furthermore, it should be noted that the solution provided in this embodiment can be combined with the solutions provided in any of the above embodiments, and no specific limitations are imposed in this regard.

[0165] Based on the same inventive concept Figure 14 A schematic diagram of another audio processing circuit provided in an embodiment of this application is shown. Figure 5 The difference in the audio processing circuit shown is that, Figure 15 The audio processing circuit 500 shown may also include a first control switch 561 to an Nth control switch 56N.

[0166] The first control switch 561 is located on the connection line between the audio PA module 520 and the first speaker 541. The first control switch 561 is used to control whether the first speaker 541 is disconnected.

[0167] In some embodiments, Figure 15 A schematic diagram of the structure of a first control switch provided in this application is shown. Figure 15 As shown, the first control switch 561 may include a first switch S1 and a second switch S2. Optionally, the first switch S1 and the second switch S2 may be implemented as MOSFETs or other semiconductor switches, without specific limitations.

[0168] See also Figure 15 The first connection terminal of the first switch S1 is connected to the VON pin of the audio processing module 520, and the second connection terminal of the first switch S1 is connected to the first input terminal of the first speaker 541. The first connection terminal of the second switch S2 is connected to the VOP pin of the audio processing module 520, and the second connection terminal of the second switch S2 is connected to the second input terminal of the first speaker 541.

[0169] In one example, the audio processing circuit may further include a switch controller connected to the control terminals of the first switch S1 and the second switch S2. The switch controller sends a first level signal to the control terminals of the first switch S1 and the second switch S2 to disconnect the first switch S1 and the second switch S2. This allows the electronic device to mute the sound from the first speaker 541.

[0170] The switch controller can also send a second level signal to the control terminal of the first switch S1 and the control terminal of the second switch S2 to control the first switch S1 and the second switch S2 to open, so that the first speaker 541 can emit sound under the drive of the audio signal.

[0171] The second control switch 562 is located on the connection line between the audio PA module 520 and the first voltage follower module 531. The second control switch 562 is used to control whether the second speaker 542 is disconnected. Alternatively, the second control switch 562 can also be located on the connection line between the first voltage follower module 531 and the second speaker 542.

[0172] In some embodiments, the second control switch 562 may also include a first switch and a second switch. The difference from the first control switch 561 is that the second connection terminal of the first switch of the second control switch 562 is connected to the first connection terminal of the first voltage follower module 531, and the second connection terminal of the second switch of the second control switch 562 is connected to the second connection terminal of the first voltage follower module 531. It should be noted that the other structures of the second control switch 562 are similar to those of the first control switch 561. Please refer to the description of the first control switch 561 in the above section of the embodiments of this application; further details will not be repeated here. The third control switch 563 to the Nth control switch 56N are similar to the second control switch 562. Please refer to the description of the second control switch 562 in the above section; further details will not be repeated here.

[0173] Furthermore, it should be noted that the solution provided in this embodiment can be combined with the solutions provided in any of the above embodiments, and no specific limitations are imposed in this regard.

[0174] Based on the same inventive concept Figure 16 This illustration shows a schematic diagram of another audio processing circuit provided in an embodiment of this application. Figure 5 The difference in the audio processing circuit shown is that, Figure 16 The audio processing circuit 500 shown includes a first audio PA and a second audio PA.

[0175] The first audio PA 521 can drive two or more speakers. The first speaker connected to the first audio PA 521 is directly connected to the first audio PA 521, and each of the remaining speakers is connected to the first audio PA 521 through a voltage follower module. In one example, taking the first audio PA 521 as having two speakers, the first audio PA 521 is connected to the first speaker 541, and the first audio PA 521 is also connected to the second speaker 542 through the first voltage follower module 531. It should be noted that the first audio PA 521 can also connect to more speakers; the specific connection method can be found in the relevant description of the second speaker 542, and will not be repeated here. Furthermore, it should be noted that the specific connection relationship of the first audio PA 521 can be found in the relevant description of the audio PA module 550 in the above section of the embodiments of this application, and will not be repeated here.

[0176] The second audio PA522 can drive one or more speakers. The first speaker connected to the second audio PA522 is directly connected to it, and each of the remaining speakers is connected to the second audio PA522 via a voltage follower module. See also the example below. Figure 16 Taking the second audio PA522 connecting two speakers as an example, the second audio PA522 is connected to the third speaker 543, and the second audio PA522 is also connected to the fourth speaker 544 through the second voltage follower module 532. It should be noted that the second audio PA522 can also connect to more speakers; the specific connection methods can be found in the relevant description of the fourth speaker 544, and will not be repeated here. Furthermore, it should also be noted that the specific connection relationships of the second audio PA522 can be found in the relevant description of the audio PA module 550 in the above-mentioned parts of the embodiments of this application, and will not be repeated here.

[0177] Furthermore, it should be noted that the solution provided in this embodiment can be combined with the solutions provided in any of the above embodiments, and no specific limitations are imposed in this regard.

[0178] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An audio processing circuit, characterized in that, Applied to an electronic device, the electronic device includes N speakers, where N is greater than or equal to 2, and the audio processing circuit includes: A power amplifier module, wherein the input terminal of the power amplifier module is used to connect to the control chip, and the output terminal of the power amplifier module is used to connect to the first speaker; There are N-1 voltage follower modules, wherein the input terminal of the i-th voltage follower module is connected to the output terminal of the power amplifier module, and the output terminal of the i-th voltage follower module is used to connect to the (i+1)-th speaker, where i is any positive integer greater than or equal to 1 and less than or equal to N-1.

2. The audio processing circuit according to claim 1, characterized in that, The power amplifier module is used to output an audio signal, which includes a first level and a second level. The i-th voltage follower module is used to acquire the audio signal, adjust the voltage of the first level to a preset voltage, and adjust the voltage of the second level to a reference voltage; And the adjusted audio signal is output to the (i+1)th speaker, wherein the preset voltage is greater than the reference voltage.

3. The audio processing circuit according to claim 1, characterized in that, The power amplifier module's output terminals include a negative output pin and a positive output pin. The negative output pin is used to output a first audio signal, and the positive output pin is used to output a second audio signal. The input terminals of the i-th voltage follower module include a first input pin and a second input pin, and the output terminals of the i-th voltage follower module include a first output pin and a second output pin. The i-th voltage follower module includes: A first voltage follower includes a first input pin and a first output pin, wherein the first input pin is connected to the negative phase output pin and the first output pin is connected to the first input terminal of the (i+1)th speaker. The second voltage follower includes a second input pin and a second output pin, the second input pin being connected to the positive output pin, and the second output pin being connected to the second input terminal of the (i+1)th speaker.

4. The audio processing circuit according to claim 3, characterized in that, The first audio signal includes a first level and a second level; The first voltage follower includes: A first switching unit, wherein the control terminal of the first switching unit is connected to the negative phase output pin, the first connection terminal of the first switching unit is used to connect to the power supply terminal, wherein the power supply terminal is used to provide a preset voltage, and the second connection terminal of the first switching unit is used to connect to the first input terminal of the (i+1)th speaker; wherein, when the control terminal of the first switching unit receives a first level, the first connection terminal and the second connection terminal of the first switching unit are turned on. The first inverting unit has its input terminal connected to the negative output pin. The first inverting unit is used to receive the first audio signal, convert the first level in the first audio signal to a second level, and convert the second level in the first audio signal to the first level. The second switching unit has a control terminal connected to the output terminal of the first inverting unit, a first connection terminal connected to the second connection terminal of the first switching unit, and a second connection terminal of the second switching unit for grounding. When the control terminal of the second switching unit receives the first level, the first connection terminal and the second connection terminal of the second switching unit are connected.

5. The audio processing circuit according to claim 4, characterized in that, The first switching unit includes an NMOS transistor, and / or, The second switching unit includes an NMOS transistor.

6. The audio processing circuit according to claim 3 or 4, characterized in that, The second audio signal includes a third level and a fourth level; The second voltage follower includes: The third switching unit has a control terminal connected to the positive output pin, a first connection terminal for connecting to a power supply terminal for providing a preset voltage, and a second connection terminal for connecting to the second input terminal of the (i+1)th speaker. When the control terminal of the third switching unit receives a third level, the first and second connection terminals of the third switching unit are connected. The second inverting unit has its input terminal connected to the non-inverting output pin. The second inverting unit is used to receive the second audio signal, convert the third level in the second audio signal to a fourth level, and convert the fourth level in the first audio signal to the third level. The fourth switching unit has its control terminal connected to the output terminal of the second inverting unit, its first connection terminal connected to the second connection terminal of the third switching unit, and its second connection terminal grounded. When the control terminal of the fourth switching unit receives the third level, the first connection terminal and the second connection terminal of the fourth switching unit are connected.

7. The audio processing circuit according to claim 6, characterized in that, The third switching unit includes an NMOS transistor, and / or, The fourth switching unit includes an NMOS transistor.

8. The audio processing circuit according to claim 2, characterized in that, The audio processing circuit also includes: The power supply module includes N power supply ports, wherein the first power supply port is the power supply port of the power amplifier module, and the (i+1)th power supply port is the power supply port of the i-th voltage follower module. The power supply module is used to provide the preset voltage of the power amplifier module through the first power supply port, and the power supply module is also used to provide the preset voltage corresponding to the i-th voltage follower module through the (i+1)th power supply port.

9. The audio processing circuit according to claim 8, characterized in that, Each voltage follower module corresponds to a preset voltage, and at least two of the preset voltages corresponding to the N-1 voltage follower modules and the preset voltage corresponding to the power amplifier module are different.

10. The audio processing circuit according to claim 8, characterized in that, The power supply module is further configured to provide a preset voltage of a first voltage value to the i-th voltage follower module through the (i+1)-th power supply port at a first moment, and to provide a preset voltage of a second voltage value to the i-th voltage follower module through the (i+1)-th port at a second moment.

11. The audio processing circuit according to claim 8, characterized in that, The power supply module is also used to provide a preset voltage of 0 to the i-th voltage follower module through the (i+1)-th port.

12. An audio processing system, characterized in that, include: The audio processing circuit as described in any one of claims 1-11; Control chip.

13. An electronic device, comprising: The audio processing circuit as described in any one of claims 1-11; Control chip; as well as, N speakers.

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