Loudspeaker

Abstract

The utility model relates to the technical field of audio, and discloses a loudspeaker which comprises a front audio processing module, a DSP sound effect processing module and an output module, the output end of the front audio processing module is connected with the input end of the DSP sound effect processing module, and the output end of the DSP sound effect processing module is connected with the output module; the front audio processing module comprises a voltage supply end, a processing unit, a feedback unit, an amplification unit, an external microphone input unit and an output unit; the voltage supply end is used for supplying power to the front audio processing module; the input end of the processing unit is connected with the output end of the voltage supply end; the feedback unit is connected between the processing unit and the amplification unit, and the output end of the amplification unit is connected with the output unit. According to the microphone, the howling of the microphone is effectively inhibited, the requirement of large playing volume required by different sites can be met on the premise that the distance between the sound head and the loudspeaker is small, and the high tone quality effect can be ensured.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of audio technology, and particularly relates to a loudspeaker. BACKGROUND

[0002] In the era of rapid development of digital audio technology, audio equipment is marching towards the direction of high integration and intelligence. The integrated conference loudspeaker greatly simplifies the complex architecture of the traditional conference audio system due to its convenience of integrating multiple functions, and is favored by various enterprises, institutions and educational institutions.

[0003] The microphone and the loudspeaker in the conventional conference audio equipment can be used separately through wires or wirelessly, and the loudspeaker vibration does not affect the sound head when shouting, so the positive feedback howling is relatively easy to control. The integrated loudspeaker ingeniously integrates the originally dispersed audio processing links in a compact device, greatly improving the portability and ease of use of the device.

[0004] However, the structure of the integrated conference loudspeaker is relatively compact because the sound head and the loudspeaker are placed in a relatively compact space, and the distance between them is relatively close. When the loudspeaker works, the loudspeaker will produce strong mechanical vibration in the process of converting the audio signal into sound and radiating to the surrounding space. Due to the compact internal structure of the device, this vibration can easily be conducted to the sound head through the shell of the device and the internal air medium. After the sound head receives this interference signal caused by the vibration of the loudspeaker, it will convert it into an electrical signal together with the original voice signal that needs to be picked up. After being processed by the amplification circuit inside the loudspeaker, this part of the interference signal is further amplified, forming a positive feedback loop, and eventually leading to the generation of howling. In this structure, a large playing volume cannot be achieved, and it is difficult to meet the needs of different venues, resulting in poor auditory experience. CONTENT OF THE UTILITY MODEL

[0005] In order to solve the deficiencies of the prior art, the application provides a loudspeaker. Through the cooperation and adjustment of the front-end audio processing module and the DSP audio processing module, the strength of the input audio signal is improved by the front-end amplification of the front-end audio processing module, that is, the peak point of each frequency point is limited until the peak point feedback disappears, and the signal amplitude is adjusted to be suitable for the output device by the rear-end reduction of the DSP audio processing module to ensure the quality of the sound, effectively suppress the microphone howling, and meet the large playing volume required by different venues under the premise that the distance between the sound head and the loudspeaker is relatively close, so that the high sound quality effect can be ensured.

[0006] The technical effects achieved by the application are realized through the following aspects:

[0007] The application provides a loudspeaker, which comprises a front audio processing module, a DSP sound processing module and an output module, the output end of the front audio processing module is connected with the input end of the DSP sound processing module, and the output end of the DSP sound processing module is connected with the output module.

[0008] The front audio processing module comprises a voltage supply end, a processing unit, a feedback unit, an amplification unit, an external microphone input unit and an output unit.

[0009] The voltage supply end is used for supplying power for the front audio processing module; the input end of the processing unit is connected with the output end of the voltage supply end; the feedback unit is connected between the processing unit and the amplification unit, and the output end of the amplification unit is connected with the output unit.

[0010] In some implementations, the processing unit comprises a filter element, a resistor R55, an inductor L3, an interface MKXIM IC and a coupling element.

[0011] The input end of the filter element is connected with the voltage supply end, the resistor R55 and the coupling element are both connected in series with one end of the inductor L3, the other end of the inductor L3 is connected with the interface MKXIM IC, the input end of the resistor R55 is connected with the voltage supply end, and the output end of the coupling element is connected with the amplification unit.

[0012] In some implementations, the feedback unit comprises a resistor R60 and a capacitor C47 connected in series, the other end of the resistor R60 is connected with the output end of the amplification unit, and the other end of the capacitor C47 is connected between the output end of the processing unit and the input end of the amplification unit.

[0013] In some implementations, the feedback unit further comprises a resistor R58 and a capacitor C40 connected in parallel, and the parallel branch of the resistor R58 and the capacitor C40 is connected in parallel with the series branch of the resistor R60 and the capacitor C47.

[0014] One end of the parallel branch of the resistor R58 and the capacitor C40 is connected with the output end of the amplification unit, and the other end of the parallel branch of the resistor R58 and the capacitor C40 is connected between the output end of the processing unit and the input end of the amplification unit.

[0015] In some implementations, the loudspeaker further comprises a lithium battery control module, and the lithium battery control module is connected with the front audio processing module and the DSP sound processing module.

[0016] The lithium battery control module comprises a lithium battery input unit, a control unit and a first DC / DC conversion unit, the input end of the control unit is connected with the lithium battery input unit, the output end of the control unit is connected with the input end of the first DC / DC conversion unit, and the output end of the first DC / DC conversion unit is connected with the input end of the front-end audio processing module.

[0017] In some implementations, the control unit comprises a capacitor C22, a resistor R41, a resistor R66, a transistor Q3 and a transistor Q2.

[0018] The capacitor C22 and the resistor R41 are connected in series, the input end of the capacitor C22 is connected with the lithium battery input unit, and the output end of the resistor R41 is connected with the base of the transistor Q3.

[0019] The resistor R66 is connected between the collector of the transistor Q3 and the gate of the transistor Q2, the emitter of the transistor Q3 is grounded, and the drain of the transistor Q2 is connected with the input end of the first DC / DC conversion unit.

[0020] In some implementations, the DSP sound effect processing module comprises a chip U1.

[0021] The first DC / DC conversion unit comprises a conversion chip U3, an inductor L1 and a feedback voltage unit.

[0022] The EN pin of the conversion chip U3 is connected with the control unit, the SW pin of the conversion chip U3 is connected with the inductor L1, the inductor L1 is connected with the chip U1, the FB pin of the conversion chip U3 is connected with the feedback voltage unit, and the OUT pins of the conversion chip U3 are connected with the voltage supply end and the chip U1.

[0023] In some implementations, the loudspeaker further comprises a power management module, and the power management module is connected with the lithium battery control module.

[0024] The power management module comprises a USB interface unit, a filter unit, a second DC / DC conversion unit and an external charging input end, the USB interface unit is connected with the external charging input end, and the filter unit is connected between the second DC / DC conversion unit and the lithium battery control module.

[0025] In some implementations, the USB interface unit comprises a TYPE-C, a resistor R12 and a resistor R13, the pin 3 of the TYPE-C is connected with the external charging input end.

[0026] One end of the resistor R12 is connected with the pin 11 of the TYPE-C, and the other end of the resistor R12 is grounded;

[0027] One end of the resistor R13 is connected with the pin 5 of the TYPE-C, and the other end of the resistor R13 is grounded.

[0028] In some implementations, the second DC / DC conversion unit comprises a conversion chip U2;

[0029] The filter unit comprises a capacitor C6, a capacitor C5, a diode D5 and a magnetic bead FB1;

[0030] One end of the capacitor C6 is connected with one end of the magnetic bead FB1, and the other end of the capacitor C6 is grounded;

[0031] One end of the capacitor C5 is connected between the pin 5 of the conversion chip U2 and the other end of the magnetic bead FB1, and the other end of the capacitor C5 is grounded;

[0032] The cathode of the diode D5 is connected with one end of the magnetic bead FB1, and the anode of the diode D5 is grounded.

[0033] In summary, the present application has at least the following advantages:

[0034] The loudspeaker provided by the present application can adjust the impedance of the circuit through the processing unit of the front-end audio processing module, ensure the impedance matching between the output of the sound head and the amplification circuit, and further reduce the signal reflection and loss and improve the signal transmission efficiency. The feedback unit can form an RC network to offset the high-frequency positive feedback of 12KHz, i.e. to limit the peak point of each frequency point until the peak point feedback disappears, effectively suppress the microphone howling, and greatly improve the strength of the input audio signal. Meanwhile, in cooperation with the DSP audio processing module, the post-amplification can adjust the signal amplitude to be suitable for the output device to ensure the sound quality, realize the requirement of large playing volume in different places under the premise of close distance between the sound head and the loudspeaker, ensure the high sound quality effect, and improve the hearing experience. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 FIG. 1 is a structural schematic diagram of the loudspeaker in the embodiment 1 of the present application.

[0036] Figure 2 FIG. 2 is another structural schematic diagram of the loudspeaker in the embodiment 1 of the present application.

[0037] Figure 3 FIG. 3 is a structural schematic diagram of the front-end audio processing module in the embodiment 1 of the present application.

[0038] Figure 4The structure diagram of the loudspeaker in Embodiment 2 of the present application.

[0039] Figure 5 The structure diagram of the lithium battery control module in Embodiment 2 of the present application.

[0040] Figure 6 The structure diagram of the power management module in Embodiment 2 of the present application.

[0041] Figure 7 The structure diagram of the audio system in Embodiment 3 of the present application.

[0042] Markings in the figure:

[0043] 100, loudspeaker, 1, front audio processing module, V1, voltage supply end, 11, processing unit, 111, filter element, 112, coupling element, 12, feedback unit, 13, amplification unit, 14, external microphone input unit, 15, output unit; 2, DSP sound effect processing module; 3, output module, 31, power amplification output module, 32, line amplification output module; 4, lithium battery control module, 41, lithium battery input unit, 42, control unit, 43, first DC / DC conversion unit, 431, feedback voltage unit; 5, power management module, 51, filter unit, 52, second DC / DC conversion unit, CHG-IN, external charging input end; 200, audio system. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. The described embodiments are part of the embodiments of the present application, rather than all the embodiments of the present application.

[0045] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present application.

[0046] Embodiment 1:

[0047] Please refer to the drawings Figures 1-2The loudspeaker of the present application comprises a front audio processing module 1, a DSP audio processing module 2 and an output module 3, the output end of the front audio processing module 1 is connected with the input end of the DSP audio processing module 2, and the output end of the DSP audio processing module 2 is connected with the output module 3. Specifically, the output module 3 can comprise a power amplification output module 31 and a line amplification output module 32, both of which are connected with the DSP audio processing module 2.

[0048] Please refer to the accompanying drawings Figure 3 The front audio processing module 1 comprises a voltage supply end V1, a processing unit 11, a feedback unit 12, an amplification unit 13, an external microphone input unit 14 and an output unit 15; the voltage supply end V1 is used for supplying power for the front audio processing module 1; the input end of the processing unit 11 is connected with the output end of the voltage supply end V1; the feedback unit 12 is connected between the processing unit 11 and the amplification unit 13, and the output end of the amplification unit 13 is connected with the output unit 15. Specifically, the voltage supply end V1 adopts a 4.5V voltage.

[0049] The loudspeaker 100 in the embodiment can ensure that the output of the sound head is matched with the impedance of the amplification circuit by adjusting the impedance of the circuit with the processing unit 11, thereby reducing signal reflection and loss and effectively improving the efficiency of signal transmission; the feedback unit 12 can form an RC network to offset the high-frequency positive feedback of 12KHz, that is, the peak point of each frequency point can be limited until the peak point feedback disappears, thereby suppressing the microphone howling and effectively improving the strength of the input audio signal. Meanwhile, the signal is adjusted by the DSP audio processing module 2, which can adjust the signal amplitude to be suitable for the output device to ensure the quality of the sound. The loudspeaker can meet the requirement of large playing volume in different places under the premise that the distance between the sound head and the loudspeaker is short, can ensure the high sound quality effect and improve the auditory experience.

[0050] By combining the front audio processing module 1 and the DSP audio processing module 2, the signal is first amplified in the front audio processing module 1, which can improve the signal strength to a more suitable level, generally to several hundred millivolts, so that the signal can better resist noise interference in the subsequent circuit; then the signal is reduced by the DSP audio processing module 2, which can ensure that the final output signal can be correctly reproduced by the loudspeaker and other devices, and the device will not be damaged or distorted due to the excessive signal amplitude. In this structure, the integrated loudspeaker 100 can meet the requirement of large playing volume in different places under the premise that the distance between the sound head and the loudspeaker is short, and can ensure the high sound quality effect. The structure is convenient to use, has a wide sound coverage and effectively improves the auditory experience.

[0051] In some embodiments, the processing unit 11 comprises a filter element 111, a resistor R55, an inductor L3, an interface MKX IM I C, and a coupling element 112; an input end of the filter element 111 is connected with the voltage supply end V1, the resistor R55 and the coupling element 112 are both connected in series with one end of the inductor L3, the other end of the inductor L3 is connected with the interface MKX IM I C, an input end of the resistor R55 is connected with the voltage supply end V1, and an output end of the coupling element 112 is connected with the amplifying unit 13.

[0052] Specifically, the filter element 111 is composed of a resistor R49, a capacitor C36, a resistor R53, and a capacitor C42, wherein the resistor R49 and the capacitor C36 are connected in series, one end of the resistor R49 is connected with the voltage supply end V1, and the other end of the capacitor C36 is grounded. The resistor R53 and the capacitor C42 are connected in series, one end of the resistor R53 is connected between the resistor R49 and the capacitor C36, and the other end of the capacitor C42 is grounded. The coupling element 112 is composed of a capacitor C39 and a resistor R57 connected in series.

[0053] Through the above setting, the voltage supply end V14.5V enters the resistor R49, is filtered by the capacitor C36 at the first stage, and then flows through the resistor R53 and the capacitor C42 for the second stage of filtering. After the filtering is completed, the voltage supply end V14.5V enters the interface MKX IM I C through the resistor R55 and the inductor L3, and the signal output of the interface MKX IM I C is coupled into the negative phase of the operational amplifier through the inductor L3, the capacitor C39, and the resistor R57 for amplification.

[0054] In addition, the power supply of the amplifier U5 in the amplifying unit 13 is input by the resistor R48 and the decoupling capacitor C35, a voltage dividing bias circuit 1 / 2VCC bias voltage is composed of the resistor R50, the resistor R54, and the capacitor C37, and the operational amplifier positive phase is input by the resistor R52 to provide a basis for signal amplification.

[0055] Through the above combination design of the inductor L3, the impedance of the circuit can be effectively adjusted, the impedance matching between the output of the head and the amplifying circuit is effectively ensured, the signal reflection and loss are reduced, and the signal transmission efficiency is improved.

[0056] In some embodiments, the feedback unit 12 comprises a resistor R60 and a capacitor C47 connected in series, the other end of the resistor R60 is connected with the output end of the amplifying unit 13, and the other end of the capacitor C47 is connected between the output end of the processing unit 11 and the input end of the amplifying unit 13. Through the above setting, the series branch of the resistor R60 and the capacitor C47 forms an RC network, and the high-frequency positive feedback of 12KHz can be offset, that is, the peak point of each frequency point can be limited, for example, when the 500Hz peak point is detected in the feedback, the 500Hz peak point is pressed down until the peak point feedback disappears, so that the function of resisting feedback is ensured.

[0057] In addition, the feedback unit 12 further comprises a parallel connection of a resistor R58 and a capacitor C40, the parallel connection of the resistor R58 and the capacitor C40 being connected in parallel with the series connection of the resistor R60 and the capacitor C47; one end of the parallel connection of the resistor R58 and the capacitor C40 is connected to the output end of the amplification unit 13, and the other end of the parallel connection of the resistor R58 and the capacitor C40 is connected between the output end of the processing unit 11 and the input end of the amplification unit 13. The parallel connection of the resistor R58 and the capacitor C40 in the circuit can prevent harmonic oscillation, further ensuring the stability of the signal.

[0058] It should be noted that the signal entering the external microphone input end J2 of the external microphone input unit 14 enters the operational amplifier through the resistor R68, the capacitor C45, the inductor L6 and the capacitor C46, the resistor R70 has a capacitor discharge function, preventing the external signal from being parasitically applied to the capacitor C45, causing the operational amplifier to be impacted, and the ED3 has an anti-static protection function, and the signal is amplified and then output through the capacitor C38 and the resistor R56 of the output unit 15.

[0059] Embodiment 2:

[0060] The difference between this embodiment and embodiment 1 is that, as shown in Figures 4-5 The loudspeaker 100 of this embodiment further comprises a lithium battery control module 4, and the lithium battery control module 4 is connected with the pre-audio processing module 1 and the DSP audio processing module 2.

[0061] The lithium battery control module 4 comprises a lithium battery input unit 41, a control unit 42 and a first DC / DC conversion unit 43, the lithium battery input unit 41 is connected with the input end of the control unit 42, the output end of the control unit 42 is connected with the input end of the first DC / DC conversion unit 43, and the output end of the first DC / DC conversion unit 43 is connected with the input end of the pre-audio processing module 1.

[0062] Specifically, the lithium battery input unit 41 comprises a power switch VR2.2 and a voltage input end 3.7V, and the power switch VR2.2 controls the input or disconnection of the voltage input end 3.7V.

[0063] The control unit 42 comprises a capacitor C22, a resistor R41, a resistor R66, a transistor Q3 and a transistor Q2; the capacitor C22 and the resistor R41 are connected in series, the input end of the capacitor C22 is connected with the lithium battery input unit 41, and the output end of the resistor R41 is connected with the base of the transistor Q3; the resistor R66 is connected between the collector of the transistor Q3 and the gate of the transistor Q2, the emitter of the transistor Q3 is grounded, and the drain of the transistor Q2 is connected with the input end of the first DC / DC conversion unit 43.

[0064] The DSP sound effect processing module 2 comprises a chip U1; the first DC / DC conversion unit 43 comprises a conversion chip U3, an inductor L1 and a feedback voltage unit 431; the EN pin of the conversion chip U3 is connected with the control unit 42, the SW pin of the conversion chip U3 is connected with the inductor L1, the inductor L1 is connected with the chip U1, the FB pin of the conversion chip U3 is connected with the feedback voltage unit 431, and the OUT pin of the conversion chip U3 is connected with the voltage supply end V1 and the chip U1.

[0065] It can be understood that when the power switch VR2.2 is closed, the voltage input end 3.7V charges the capacitor C22, and due to the capacitor C22 capacity, the voltage input end 3.7V discharges to the transistor Q3 through the resistor R41, the transistor Q3 is turned on to the ground, the gate bias voltage of the transistor Q2 is pulled down to 0V through the resistor R66, the transistor Q2 is turned on, so that the voltage input end 3.7V is input to the EN pin of the conversion chip U3, the conversion chip U3 works, and the 4.5V after the conversion chip U3 is boosted is output from the OUT pin, as shown in Figure 5 The capacitor C26 is filtered to the double diode D10-A1, and after being decoupled and filtered by the resistor R84, the capacitor C14, the capacitor C15 and the capacitor C16, it is supplied to the chip U1, and the chip U1 works. At this time, the 37 pin of the chip U1 outputs to maintain the EN pin of the phase-locked conversion chip U3, and the conversion chip U3 continuously works. Among them, the capacitor C22 delays discharging for several seconds, and after the start of each circuit unit, the transistor Q2 and the transistor Q3 are automatically cut off.

[0066] In addition, please refer to Figure 1 When the power switch VR2.2 is closed, the resistor R20 and the resistor R30 form a voltage dividing circuit to the 30 pin of the chip U1 for detection after the hard switch, the 30 pin of the chip U1 detects the voltage from the hard switch, and outputs a high level from the 37 pin to the double diode D13-A1 to the EN pin of the conversion chip U3 and phase-locks, the conversion chip U3 enables and boosts 4.5V to output to all circuit units to work.

[0067] When the power switch VR2.2 is disconnected, the voltage of the 30 pin of the chip U1 is lower than that when it is closed, the 37 pin of the chip U1 automatically turns off the output, the EN pin of the conversion chip U3 loses the effective high level, and stops working. The 4.5V output is turned off, and the whole machine is shut down.

[0068] Among them, the chip U1 can set the power-off time, and when there is no any signal input, the 37 pin of the chip U1 is turned from high level to low level after 15 minutes, the EN pin of the conversion chip U3 loses the effective high level, and stops working, and all circuit units stop working. The setting can achieve the effect of energy saving and power saving.

[0069] The lithium battery control module 4 in the embodiment utilizes a 3.7V lithium battery to boost power through a chip, thereby realizing the effect of energy saving and cost saving.

[0070] In some embodiments, referring to Figure 4 and Figure 6 , the loudspeaker 100 further comprises a power management module 5 connected with the lithium battery control module 4; the power management module 5 comprises a USB interface unit, a filter unit 51, a second DC / DC conversion unit 52, and an external charging input end CHG-I N; the USB interface unit is connected with the external charging input end CHG-I N; the filter unit 51 is connected between the second DC / DC conversion unit 52 and the lithium battery control module 4. Among them, the lithium battery control module 4 is connected with the external charging input end CHG-I N, which can charge the lithium battery in the lithium battery control module 4.

[0071] Specifically, the USB interface unit comprises a TYPE-C, a resistor R12, and a resistor R13; a pin 3 of the TYPE-C is connected with the external charging input end CHG-I N; one end of the resistor R12 is connected with a pin 11 of the TYPE-C, and the other end of the resistor R12 is grounded; one end of the resistor R13 is connected with a pin 5 of the TYPE-C, and the other end of the resistor R13 is grounded. Through the above setting, the TYPE-C charging port compensates the resistors R12 and R13, so that the resistance thereof can support all mobile phone fast charging adapters on the market, without the need for special charging adapters, and the use of mobile phone adapters for charging can reduce the cost and is convenient for users to use.

[0072] The second DC / DC conversion unit 52 comprises a conversion chip U2; the filter unit 51 comprises a capacitor C6, a capacitor C5, a diode D5, and a magnetic bead FB1; one end of the capacitor C6 is connected with one end of the magnetic bead FB1, and the other end of the capacitor C6 is grounded; one end of the capacitor C5 is connected between a pin 5 of the conversion chip U2 and the other end of the magnetic bead FB1, and the other end of the capacitor C5 is grounded; a cathode of the diode D5 is connected with one end of the magnetic bead FB1, and an anode of the diode D5 is grounded. Through the above setting, the external charging input end CHG-I N DC5V is input to the pins 4 and 8 of the conversion chip U2, is output from the pin 5 of the conversion chip U2 after being stabilized by the conversion chip U2, and is input to the 3.7V lithium battery through the magnetic bead FB1, and the filter capacitor C5, the capacitor C6, and the diode D5 can prevent battery reverse connection protection.

[0073] The power management module 5 in the embodiment adopts a special USB interface unit, so that the charging interface of the loudspeaker 100 can support all mobile phone fast charging adapters on the market, without the need for special charging adapters, thereby reducing the production cost and being convenient for operators to use, and the filter unit 51 can also ensure the stability of the circuit.

[0074] Embodiment 3:

[0075] This embodiment is based on the above-mentioned embodiments, and provides an audio system 200 comprising the above-mentioned loudspeaker 100. Figure 7

[0076] The audio system 200 in this embodiment is designed in cooperation with the front-end audio processing module 1 and the DSP sound processing module 2, which can effectively suppress the microphone howling, and can meet the requirement of a larger playing volume in different venues on the premise that the distance between the sound head and the loudspeaker is relatively close, and can ensure the high sound quality effect, greatly optimizing the hearing effect of the audio system 200.

[0077] In this application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0078] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the product of the application is used, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0079] In addition, the terms "horizontal", "vertical", "suspension" and the like do not mean that the components must be absolutely horizontal or suspended, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0080] ​In the present application, unless specifically stated and limited otherwise, a first feature on or above a second feature can include the first and second features being directly in contact, or can include the first and second features not being directly in contact but being in contact through another feature between them. Also, a first feature on, above and over a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature under, below and under a second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0081] Although the present application has been described in connection with the above specific embodiments, it will be readily apparent to those skilled in the art that numerous substitutions, modifications and changes can be made thereto without departing from the spirit and scope of the application as set forth in the appended claims.

Claims

1. A loudspeaker, characterized by The loudspeaker comprises a front audio processing module, a DSP sound processing module and an output module, an output end of the front audio processing module is connected with an input end of the DSP sound processing module, and an output end of the DSP sound processing module is connected with the output module; The front audio processing module comprises a voltage supply end, a processing unit, a feedback unit, an amplification unit, an external microphone input unit and an output unit; The voltage supply end is used for supplying power for the front audio processing module; an input end of the processing unit is connected with an output end of the voltage supply end; the feedback unit is connected between the processing unit and the amplification unit, and an output end of the amplification unit is connected with the output unit.

2. The loudspeaker of claim 1, wherein, The processing unit comprises a filter element, a resistor R55, an inductor L3, an interface MKXI MIC and a coupling element; An input end of the filter element is connected with the voltage supply end; the resistor R55 and the coupling element are connected in series with one end of the inductor L3; the other end of the inductor L3 is connected with the interface MKXI MIC; an input end of the resistor R55 is connected with the voltage supply end; and an output end of the coupling element is connected with the amplification unit.

3. The loudspeaker of claim 1, wherein, The feedback unit comprises a resistor R60 and a capacitor C47 connected in series; the other end of the resistor R60 is connected with an output end of the amplification unit; and the other end of the capacitor C47 is connected between an output end of the processing unit and an input end of the amplification unit.

4. The loudspeaker of claim 3, wherein, The feedback unit further comprises a resistor R58 and a capacitor C40 connected in parallel; a parallel branch of the resistor R58 and the capacitor C40 is connected in parallel with a series branch of the resistor R60 and the capacitor C47; One end of the parallel branch of the resistor R58 and the capacitor C40 is connected with an output end of the amplification unit; and the other end of the parallel branch of the resistor R58 and the capacitor C40 is connected between an output end of the processing unit and an input end of the amplification unit.

5. A loudspeaker according to any one of claims 1-4, characterised in that The loudspeaker further comprises a lithium battery control module; the lithium battery control module is connected with the front audio processing module and the DSP sound processing module; The lithium battery control module comprises a lithium battery input unit, a control unit and a first DC / DC conversion unit; the lithium battery input unit is connected with an input end of the control unit; an output end of the control unit is connected with an input end of the first DC / DC conversion unit; and an output end of the first DC / DC conversion unit is connected with an input end of the front audio processing module.

6. The loudspeaker of claim 5, wherein, The control unit comprises a capacitor C22, a resistor R41, a resistor R66, a transistor Q3 and a transistor Q2; The capacitor C22 and the resistor R41 are connected in series; an input end of the capacitor C22 is connected with the lithium battery input unit; and an output end of the resistor R41 is connected with a base of the transistor Q3; The resistor R66 is connected between a collector of the transistor Q3 and a gate of the transistor Q2; an emitter of the transistor Q3 is grounded; and a drain of the transistor Q2 is connected with an input end of the first DC / DC conversion unit.

7. The loudspeaker of claim 5, wherein, The DSP sound effect processing module comprises a chip U1; The first DC / DC conversion unit comprises a conversion chip U3, an inductor L1 and a feedback voltage unit; An EN pin of the conversion chip U3 is connected with the control unit, an SW pin of the conversion chip U3 is connected with the inductor L1, the inductor L1 is connected with the chip U1, an FB pin of the conversion chip U3 is connected with the feedback voltage unit, and OUT pins of the conversion chip U3 are connected with the voltage supply end and the chip U1.

8. The loudspeaker of claim 5, wherein, The loudspeaker further comprises a power management module connected with the lithium battery control module. The power management module comprises a USB interface unit, a filter unit, a second DC / DC conversion unit and an external charging input end, the USB interface unit is connected with the external charging input end, and the filter unit is connected between the second DC / DC conversion unit and the lithium battery control module.

9. The loudspeaker of claim 8, wherein, The USB interface unit comprises a TYPE-C, a resistor R12 and a resistor R13, a pin 3 of the TYPE-C is connected with the external charging input end; One end of the resistor R12 is connected with a pin 11 of the TYPE-C, and the other end of the resistor R12 is grounded; One end of the resistor R13 is connected with a pin 5 of the TYPE-C, and the other end of the resistor R13 is grounded.

10. The loudspeaker of claim 9, wherein, The second DC / DC conversion unit comprises a conversion chip U2; The filter unit comprises a capacitor C6, a capacitor C5, a diode D5 and a magnetic bead FB1; One end of the capacitor C6 is connected with one end of the magnetic bead FB1, and the other end of the capacitor C6 is grounded; One end of the capacitor C5 is connected between a pin 5 of the conversion chip U2 and the other end of the magnetic bead FB1, and the other end of the capacitor C5 is grounded; A cathode of the diode D5 is connected with one end of the magnetic bead FB1, and an anode of the diode D5 is grounded.

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