Loudspeaker

Abstract

The invention 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] This application belongs to the field of audio technology, and particularly relates to a loudspeaker Background Art

[0002] In the era of the rapid development of digital audio technology today, audio devices are moving forward in big steps towards high integration and intelligence. The all-in-one conference loudspeaker, with its convenience of integrating multiple functions, greatly simplifies the complex architecture of traditional conference audio systems and is deeply favored by various enterprises, institutions, and educational venues.

[0003] In conventional conference audio devices, the microphone and speaker can be used separately through wires or wirelessly. When shouting, the vibration of the speaker does not affect the microphone element, so positive feedback whistling is relatively easy to control. The all-in-one loudspeaker cleverly integrates the originally scattered audio processing links into a compact device, greatly improving the portability and ease of use of the device.

[0004] However, due to the fact that the microphone element and the speaker are placed in a relatively compact space in the structure of the all-in-one conference loudspeaker, and the distance between them is relatively close. When the loudspeaker works, during the process of converting the audio signal into sound and radiating it into the surrounding space, strong mechanical vibrations will be generated. Due to the compact internal structure of the device, this vibration is easily conducted to the microphone element through the casing of the device and the air medium inside. After receiving this interference signal caused by the vibration of the speaker, the microphone element will convert it into an electrical signal output together with the original human voice signal 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, ultimately resulting in the generation of a whistling phenomenon. In this structure, it is impossible to achieve a large playback volume, making it difficult to meet the requirements of different venues and resulting in a poor auditory experience. Summary of the Invention

[0005] To solve the deficiencies of the above-mentioned prior art, this application provides a loudspeaker. Through the cooperation and adjustment of a pre-audio processing module and a DSP audio effect processing module, the pre-amplification of the pre-audio processing module is used to increase the intensity of the input audio signal, and then the peak points of each frequency point can be compressed until the feedback of this peak point disappears. Combined with the post-reduction of the DSP audio effect processing module, the signal amplitude is adjusted to be suitable for the output device to ensure the sound quality, effectively suppressing the microphone whistling. It can achieve a large playback volume required for different venues even when the distance between the microphone element and the speaker is relatively close, and can ensure high-quality sound effects.

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

[0007] The present application provides a loudspeaker, which includes a front-end audio processing module, a DSP sound effect processing module, and an output module. The output end of the front-end audio processing module is connected to the input end of the DSP sound effect processing module, and the output end of the DSP sound effect processing module is connected to the output module;

[0008] The front-end audio processing module includes 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 to supply power to the front-end audio processing module; the input end of the processing unit is connected to 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 to the output unit.

[0010] In some implementation manners, the processing unit includes a filtering element, a resistor R55, an inductor L3, an interface MKXI M IC, and a coupling element;

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

[0012] In some implementation manners, the feedback unit includes a series-connected resistor R60 and capacitor C47. The other end of the resistor R60 is connected to 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 implementation manners, the feedback unit further includes a parallel-connected resistor R58 and capacitor C40. 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 to 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 implementation manners, the loudspeaker further includes a lithium battery control module, and the lithium battery control module is connected to both the front-end audio processing module and the DSP sound effect processing module;

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

[0017] In some implementation manners, the control unit includes 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 to the lithium battery input unit. The output end of the resistor R41 is connected to 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. The drain of the transistor Q2 is connected to the input end of the first DC / DC conversion unit.

[0020] In some implementation manners, the DSP audio effect processing module includes a chip U1.

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

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

[0023] In some implementation manners, the loudspeaker further includes a power management module, and the power management module is connected to the lithium battery control module.

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

[0025] In some implementation manners, the USB interface unit includes a TYPE-C, a resistor R12, and a resistor R13. The pin 3 of the TYPE-C is connected to the external charging input end.

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

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

[0028] In some implementation manners, the second DC / DC conversion unit includes a conversion chip U2;

[0029] The filtering unit includes a capacitor C6, a capacitor C5, a diode D5, and a bead FB1;

[0030] One end of the capacitor C6 is connected to one end of the bead FB1, and the other end of the capacitor C6 is connected to ground;

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

[0032] The cathode of the diode D5 is connected to one end of the bead FB1, and the anode of the diode D5 is connected to ground.

[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 sound head output and the amplification circuit, thereby reducing signal reflection and loss, and improving signal transmission efficiency; its feedback unit can form an RC network to cancel the high-frequency positive feedback of 12 KHz, that is, the peak point of each frequency point can be compressed until the peak point feedback disappears, effectively suppressing microphone howling, so that the pre-amplification can greatly improve the intensity of the input audio signal. At the same time, in cooperation with the DSP audio effect processing module for adjustment, the subsequent reduction can adjust the signal amplitude to be suitable for the output device to ensure the sound quality, and can achieve a relatively large playback volume required for different venues even when the distance between the sound head and the speaker is relatively close, can ensure high-quality sound effects, and improve the auditory experience. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

[0038] Figure 4This is a schematic structural diagram of the loudspeaker in Embodiment 2 of the present application.

[0039] Figure 5 This is a schematic structural diagram of the lithium battery control module in Embodiment 2 of the present application.

[0040] Figure 6 This is a schematic structural diagram of the power management module in Embodiment 2 of the present application.

[0041] Figure 7 This is a schematic structural diagram of the audio system in Embodiment 3 of the present application.

[0042] Markings in the figure:

[0043] 100, loudspeaker; 1, pre-audio processing module; V1, voltage supply terminal; 11, processing unit; 111, filtering element; 112, coupling element; 12, feedback unit; 13, amplification unit; 14, external microphone input unit; 15, output unit; 2, DSP audio 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, filtering unit; 52, second DC / DC conversion unit; CHG-IN, external charging input terminal; 200, audio system. Detailed implementation manners

[0044] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. The described embodiments are some, but not all, of 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 present application claimed, but merely represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts fall within the scope of protection of the present application.

[0046] Embodiment 1:

[0047] Please refer to the appendix Figure 1-2, a loudspeaker of the present application includes a pre - audio processing module 1, a DSP audio effect processing module 2, and an output module 3. The output end of the pre - audio processing module 1 is connected to the input end of the DSP audio effect processing module 2, and the output end of the DSP audio effect processing module 2 is connected to the output module 3. Specifically, the output module 3 may include a power amplification output module 31 and a line amplification output module 32, and both the power amplification output module 31 and the line amplification output module 32 are connected to the DSP audio effect processing module 2.

[0048] Please refer to the appendix Figure 3 , the pre - audio processing module 1 includes a voltage supply terminal 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 terminal V1 is used to supply power to the pre - audio processing module 1; the input end of the processing unit 11 is connected to the output end of the voltage supply terminal 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 to the output unit 15. Specifically, the voltage supply terminal V1 uses a 4.5V voltage.

[0049] In the loudspeaker 100 of this embodiment, by using the processing unit 11 to adjust the impedance of the circuit, it is ensured that the output of the sound head matches the impedance of the amplification circuit, thereby reducing signal reflection and loss, and effectively improving the efficiency of signal transmission; using the feedback unit 12 can form an RC network to cancel the high - frequency positive feedback of 12KHz, that is, the peak point of each frequency point can be compressed until this peak - point feedback disappears, thereby suppressing microphone howling and effectively enhancing the intensity of the input audio signal. At the same time, the signal is further adjusted by the DSP audio effect processing module 2, and the signal amplitude can be adjusted to be suitable for the output device to ensure the sound quality. It can meet the large playback volume required in different venues even when the distance between the sound head and the speaker is relatively close, ensuring high - quality sound effects and improving the auditory experience.

[0050] By combining the pre - audio processing module 1 and the DSP audio effect processing module 2, the signal is first pre - amplified in the pre - audio processing module 1, and the signal intensity can be increased to a more appropriate level, generally up to several hundred millivolts, so that the signal can better resist noise interference in the subsequent circuit; then the signal is post - reduced by the DSP audio effect processing module 2 to ensure that the finally output signal can be correctly reproduced by devices such as speakers, and the device will not be damaged or distorted due to excessive signal amplitude. In this structure, the integrated loudspeaker 100 can meet the large playback volume required in different venues even with a relatively close design between the sound head and the speaker, ensuring high - quality sound effects. This structure of the device is convenient to use, has a wide sound coverage area, and effectively improves the auditory experience.

[0051] In some embodiments, the processing unit 11 includes a filtering element 111, a resistor R55, an inductor L3, an interface MKXI MI C, and a coupling element 112; the input end of the filtering element 111 is connected to the voltage supply terminal V1, the resistor R55 and the coupling element 112 are both connected in series to one end of the inductor L3, the other end of the inductor L3 is connected to the interface MKX I M I C, the input end of the resistor R55 is connected to the voltage supply terminal V1, and the output end of the coupling element 112 is connected to the amplification unit 13.

[0052] Specifically, the filtering element 111 is composed of a resistor R49, a capacitor C36, a resistor R53, and a capacitor C42. Among them, the resistor R49 and the capacitor C36 are connected in series, one end of the resistor R49 is connected to the voltage supply terminal 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 series-connected capacitor C39 and a resistor R57.

[0053] With the above settings, 4.5V from the voltage supply terminal V1 enters the resistor R49, is filtered by the capacitor C36 at the first stage, and then passes through the resistor R53 and flows through the capacitor C42 for the second-stage filtering. After the filtering is completed, it enters the interface MKXI MI C through the resistor R55 and the inductor L3. The signal output of the interface MKXI M I C then passes through the inductor L3, the capacitor C39, and the resistor R57 and is coupled into the negative phase of the operational amplifier for amplification.

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

[0055] Through the combined design of the above inductor L3, the impedance of the circuit can be effectively adjusted, effectively ensuring the impedance matching between the output of the sound head and the amplification circuit, thereby reducing signal reflection and loss and improving signal transmission efficiency.

[0056] In some embodiments, the feedback unit 12 includes a series-connected resistor R60 and capacitor C47. The other end of the resistor R60 is connected to the output end of the amplification 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 amplification unit 13. With this setting, the series branch of the resistor R60 and the capacitor C47 forms an RC network, which can cancel the high-frequency positive feedback at 12KHz. That is, the peak limit can be performed according to the peak point of each frequency point. For example, if the peak point at 500Hz is detected in the feedback, then the peak point at 500Hz is pressed down until the peak point feedback disappears, ensuring a good function of resisting feedback.

[0057] In addition, the feedback unit 12 further includes a parallel combination of a resistor R58 and a capacitor C40. The parallel branch of the resistor R58 and the capacitor C40 is in parallel with the series branch of a resistor R60 and a capacitor C47. One end of the parallel branch 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 branch 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 combination of the resistor R58 and the capacitor C40 in this circuit can prevent harmonic oscillation and further ensure the stability of the signal.

[0058] It should be noted that the signal entering from the external microphone input terminal J2 of the external microphone input unit 14 passes through a resistor R68, a capacitor C45, an inductor L6, and a capacitor C46 and then enters the operational amplifier. The resistor R70 functions to discharge the input capacitor, preventing the external signal from parasitically coupling the direct current to the capacitor C45 and causing an impact on the operational amplifier. ED3 has electrostatic protection. After the signal is amplified, it is 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 as follows. Please refer to Figures 4-5 , the loudspeaker 100 of this embodiment further includes a lithium battery control module 4, and the lithium battery control module 4 is connected to both the front-end audio processing module 1 and the DSP audio effect processing module 2.

[0061] The lithium battery control module 4 includes 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 to the input end of the control unit 42, the output end of the control unit 42 is connected to 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 to the input end of the front-end audio processing module 1.

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

[0063] The control unit 42 includes a capacitor C22, a resistor R41, a resistor R66, a transistor Q3, and a transistor Q2. The capacitor C22 and the resistor R41 are in series. The input end of the capacitor C22 is connected to the lithium battery input unit 41, and the output end of the resistor R41 is connected to 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 to the input end of the first DC / DC conversion unit 43.

[0064] The DSP audio processing module 2 includes the chip U1; the first DC / DC conversion unit 43 includes the conversion chip U3, the inductor L1, and the feedback voltage unit 431; the EN pin of the conversion chip U3 is connected to the control unit 42, the SW pin of the conversion chip U3 is connected to the inductor L1, and the inductor L1 is connected to the chip U1. The FB pin of the conversion chip U3 is connected to the feedback voltage unit 431, and the OUT pins of the conversion chip U3 are all connected to the voltage supply terminal V1 and the chip U1.

[0065] It can be understood that when the power switch VR2.2 is closed, the voltage input terminal 3.7V charges the capacitor C22. Due to the capacitance effect of the capacitor C22, the voltage input terminal 3.7V discharges to the transistor Q3 through the resistor R41. The transistor Q3 conducts to the ground, and the gate bias voltage of the transistor Q2 is pulled down to 0V through the resistor R66. The transistor Q2 conducts, so that the voltage input terminal 3.7V is input to the EN pin of the conversion chip U3, and the conversion chip U3 works. The 4.5V output after the conversion chip U3 boosts is output from the OUT pin. For example, Figure 5 in the capacitor C26 filters and supplies to the double diode D10-A1, and after decoupling and filtering through the resistor R84 and the capacitors C14, C15, and C16, it is supplied to the chip U1. The chip U1 works. At this time, the 37th pin of the chip U1 outputs to maintain the EN pin of the phase-locked conversion chip U3, and the conversion chip U3 continues to work. Among them, the capacitor C22 delays the discharge for several seconds, and after each circuit unit starts, the transistors Q2 and Q3 automatically cut off.

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

[0067] When the power switch VR2.2 is disconnected, when the voltage of the 30th pin of the chip U1 is lower than the voltage when it is closed, the level of the 37th 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 shuts down.

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

[0069] In the lithium battery control module 4 of this embodiment, a 3.7V lithium battery is used to boost the power through a chip, thereby achieving the effect of energy conservation and cost reduction.

[0070] In some embodiments, please refer to Figure 4 and Figure 6 , the loudspeaker 100 further includes a power management module 5, and the power management module 5 is connected to the lithium battery control module 4; the power management module 5 includes a USB interface unit, a filtering unit 51, a second DC / DC conversion unit 52, and an external charging input terminal CHG-IN. The USB interface unit is connected to the external charging input terminal CHG-IN, and the filtering 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 to the external charging input terminal CHG-IN, and can charge the lithium battery in the lithium battery control module 4.

[0071] Specifically, the USB interface unit includes TYPE-C, a resistor R12, and a resistor R13. The pin 3 of TYPE-C is connected to the external charging input terminal CHG-IN; one end of the resistor R12 is connected to the pin 11 of TYPE-C, and the other end of the resistor R12 is grounded; one end of the resistor R13 is connected to the pin 5 of TYPE-C, and the other end of the resistor R13 is grounded. Through this setting, the TYPE-C charging port compensates for the resistors R12 and R13, so that its resistance can support all mobile phone fast charging adapters on the market at present. There is no need to specially configure a charging adapter. Charging with a mobile phone adapter can reduce costs, and it is also convenient for users to use.

[0072] The second DC / DC conversion unit 52 includes a conversion chip U2; the filtering unit 51 includes a capacitor C6, a capacitor C5, a diode D5, and a bead FB1; one end of the capacitor C6 is connected to one end of the bead FB1, and the other end of the capacitor C6 is grounded; one end of the capacitor C5 is connected between the pin 5 of the conversion chip U2 and the other end of the bead FB1, and the other end of the capacitor C5 is grounded; the cathode of the diode D5 is connected to one end of the bead FB1, and the anode of the diode D5 is grounded. Through this setting, the external charging input terminal CHG-IN DC5V is input to the pins 4 and 8 of the conversion chip U2, and after being regulated by the conversion chip U2, it is output from the pin 5 of the conversion chip U2 and charged to the 3.7V lithium battery through the bead FB1. The filtering capacitors C5, C6, and diode D5 can prevent battery reverse connection protection.

[0073] The power management module 5 in this 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 at present. There is no need to specially configure a charging adapter, which correspondingly reduces production costs, is also convenient for operators to use, and can also ensure the stability of the circuit through the filtering unit 51.

[0074] Example 3:

[0075] Based on the above embodiments, please refer to Figure 7 , an audio system 200 is provided, including the above loudspeaker 100.

[0076] In the audio system 200 of this embodiment, the front audio processing module 1 and the DSP audio effect processing module 2 are designed in cooperation, which can effectively suppress microphone howling, and can meet the relatively large playback volume required by different venues on the premise that the distance between the microphone head and the speaker is relatively close, ensuring high-quality sound effects and greatly optimizing the auditory effect of the audio system 200.

[0077] In this application, unless otherwise clearly defined and limited, terms such as "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

[0078] In the description of this application, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is usually placed during use. It is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to this application. In addition, terms such as "first", "second", "third", etc. are only used for distinguishing descriptions, and cannot be understood as indicating or implying relative importance.

[0079] In addition, terms such as "horizontal", "vertical", "hanging" do not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0080] In this application, unless otherwise clearly specified or limited, the first feature being above or below the second feature may include direct contact between the first and second features, or may include contact between the first and second features through additional features therebetween. Moreover, the first feature being above, on top of, and over the second feature includes the first feature being directly above and diagonally above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being below, under, and beneath the second feature includes the first feature being directly below and diagonally below the second feature, or merely indicating that the horizontal height of the first feature is lower than that of the second feature.

[0081] Although the description of this application is made in conjunction with the above specific embodiments, it is obvious that those skilled in the art can make many substitutions, modifications, and variations based on the above content. Therefore, all such substitutions, improvements, and variations are included within the spirit and scope of the appended claims.

Claims

1. A loudspeaker, characterized in that, It includes a pre-audio processing module, a DSP audio effect processing module, and an output module. The output end of the pre-audio processing module is connected to the input end of the DSP audio effect processing module, and the output end of the DSP audio effect processing module is connected to the output module; The pre-audio processing module includes 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 to supply power to the pre-audio processing module; the input end of the processing unit is connected to 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 to the output unit.

2. The loudspeaker according to claim 1, characterized in that, The processing unit includes a filtering element, a resistor R55, an inductor L3, an interface MKXI MIC, and a coupling element; The input end of the filtering element is connected to 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 to the interface MKXI MIC. The input end of the resistor R55 is connected to the voltage supply end, and the output end of the coupling element is connected to the amplification unit.

3. The loudspeaker according to claim 1, characterized in that, The feedback unit includes a series-connected resistor R60 and a capacitor C47. The other end of the resistor R60 is connected to 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.

4. The loudspeaker according to claim 3, characterized in that, The feedback unit further includes a parallel-connected resistor R58 and a capacitor C40. 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; One end of the parallel branch of the resistor R58 and the capacitor C40 is connected to 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.

5. The loudspeaker according to any one of claims 1-4, characterized in that The loudspeaker further includes a lithium battery control module, and the lithium battery control module is connected to both the pre-audio processing module and the DSP audio effect processing module; The lithium battery control module includes a lithium battery input unit, a control unit, and a first DC / DC conversion unit. The lithium battery input unit is connected to the input end of the control unit, the output end of the control unit is connected to the input end of the first DC / DC conversion unit, and the output end of the first DC / DC conversion unit is connected to the input end of the pre-audio processing module.

6. The loudspeaker according to claim 5, characterized in that, The control unit includes 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 to the lithium battery input unit, and the output end of the resistor R41 is connected to 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 to the input end of the first DC / DC conversion unit.

7. The loudspeaker according to claim 5, characterized in that, The DSP audio processing module includes chip U1; The first DC / DC conversion unit includes conversion chip U3, inductor L1, and a feedback voltage unit; The EN pin of the conversion chip U3 is connected to the control unit, the SW pin of the conversion chip U3 is connected to the inductor L1, and the inductor L1 is connected to the chip U1. The FB pin of the conversion chip U3 is connected to the feedback voltage unit, and the OUT pins of the conversion chip U3 are connected to both the voltage supply terminal and the chip U1.

8. The loudspeaker according to claim 5, characterized in that, The loudspeaker further includes a power management module, and the power management module is connected to the lithium battery control module; The power management module includes a USB interface unit, a filtering unit, a second DC / DC conversion unit, and an external charging input terminal. The USB interface unit is connected to the external charging input terminal, and the filtering unit is connected between the second DC / DC conversion unit and the lithium battery control module.

9. The loudspeaker according to claim 8, characterized in that, The USB interface unit includes TYPE-C, resistor R12, and resistor R13. The pin 3 of TYPE-C is connected to the external charging input terminal; One end of the resistor R12 is connected to the pin 11 of TYPE-C, and the other end of the resistor R12 is grounded; One end of the resistor R13 is connected to the pin 5 of TYPE-C, and the other end of the resistor R13 is grounded.

10. The loudspeaker according to claim 9, characterized in that, The second DC / DC conversion unit includes conversion chip U2; The filtering unit includes capacitor C6, capacitor C5, diode D5, and bead FB1; One end of the capacitor C6 is connected to one end of the bead FB1, and the other end of the capacitor C6 is grounded; One end of the capacitor C5 is connected between the pin 5 of the conversion chip U2 and the other end of the bead FB1, and the other end of the capacitor C5 is grounded; The cathode of the diode D5 is connected to one end of the bead FB1, and the anode of the diode D5 is grounded.

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