Wireless and wired microphone loudspeaker audio circuit

Abstract

The utility model relates to the technical field of microphones and loudspeakers, and discloses a wireless and wired microphone loudspeaker audio circuit which comprises a wired microphone module which comprises a wired signal input end, a first signal processing module and a wired signal output end. The first signal processing module is connected between the wired signal input end and the wired signal output end; the wireless microphone module comprises a wireless signal input end, a second signal processing module and a common signal output end, the second signal processing module comprises a first input end, a second input end and a first output end, the wireless signal input end is connected with the first input end, and the wired signal output end is connected with the second input end; the common signal output end is connected with the first output end. By designing the first signal processing module and the second signal processing module, the sound quality difference of wireless and wired microphone signals is effectively reduced, the phenomenon of serious signal attenuation can be avoided, and good sound quality is ensured.

Description

Technical Field

[0001] This application belongs to the field of microphone amplifier technology, specifically relating to an audio circuit for a wireless or wired microphone amplifier. Background Technology

[0002] A microphone amplifier is a device used to amplify microphone signals, typically used in public speeches, musical performances, meetings, and similar settings. Its main function is to amplify the sound signal captured by the microphone so that it can be played through a speaker, allowing the sound to cover a larger area.

[0003] Currently, most wireless and wired loudspeakers on the market suffer from significant differences in sound quality because their wireless and wired signals do not share a common circuit module, and their respective signal processing circuit modules differ considerably. To address this issue, some manufacturers have attempted to use a shared circuit module for both wired and wireless signals, but this approach leads to severe signal attenuation.

[0004] Therefore, there is an urgent need to design an audio circuit that can avoid the problem of large differences in sound quality between wireless and wired amplifiers, while ensuring minimal signal attenuation. Utility Model Content

[0005] To address the shortcomings of the prior art, this application provides an audio circuit for a wireless and wired microphone amplifier. By designing a first signal processing module and a second signal processing module, the difference in sound quality between wireless and wired microphone signals is effectively reduced, ensuring good sound quality. It also avoids severe signal attenuation and effectively guarantees the stability of signal output.

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

[0007] This application provides a wireless and wired microphone amplifier audio circuit, including...

[0008] A wired microphone module, comprising a wired signal input terminal, a first signal processing module, and a wired signal output terminal, wherein the first signal processing module is connected between the wired signal input terminal and the wired signal output terminal; and

[0009] A wireless microphone module includes a wireless signal input terminal, a second signal processing module, and a common signal output terminal. The second signal processing module includes a first input terminal, a second input terminal, and a first output terminal. The wireless signal input terminal is connected to the first input terminal, the wired signal output terminal is connected to the second input terminal, and the common signal output terminal is connected to the first output terminal.

[0010] In some implementations, the first signal processing module includes an operational amplifier chip U6, a first anti-distortion unit, a signal feedback unit, and a frequency division feedback unit;

[0011] The operational amplifier chip U6 is connected to the first anti-distortion unit and the signal feedback unit, and the frequency division feedback unit is connected between the signal feedback unit and the wired signal output terminal.

[0012] In some implementations, the operational amplifier chip U6 has an input pin P2, an input pin P3, an output pin P1, a bias adjustment pin P4, and a positive power supply pin P5;

[0013] The first anti-distortion unit includes resistors R65, R66, and R67. Resistors R65 and R66, connected in series, are connected between input pin P2 and input pin P3. One end of resistor R65 is connected to input pin P3, and one end of resistor R66 is grounded. One end of resistor R67 is connected to the positive power supply pin P5, and the other end of resistor R67 is connected between resistors R65 and R66.

[0014] In some implementations, the signal feedback unit includes a resistor R59, one end of which is connected to the output pin P1, and the other end of which is connected to the bias adjustment pin P4.

[0015] In some implementations, the frequency division feedback unit includes capacitor C63, capacitor C22, and resistor R19. The capacitor C63 is connected in parallel with the resistor R59, and one end of the capacitor C63 is connected to the wired signal output terminal.

[0016] The capacitor C22 is connected in series with the resistor R19, and the series-connected capacitor C22, resistor R19 and capacitor C63 are connected in parallel.

[0017] In some implementations, the first signal processing module further includes a filtering unit, which includes a capacitor C64 and a resistor R60. One end of the resistor R60 is connected to the bias adjustment pin P4, and the other end of the resistor R60 is connected to ground.

[0018] In some implementations, the second signal processing module includes an operational amplifier chip U7, a second anti-distortion unit, a feedback processing unit, and a frequency division cutoff unit;

[0019] The second anti-distortion unit is connected between the operational amplifier chip U7 and ground;

[0020] The feedback processing unit is connected between the operational amplifier chip U7 and the common signal output terminal;

[0021] The frequency division cutoff unit is connected between the operational amplifier chip U7 and ground.

[0022] In some implementations, the operational amplifier chip U7 includes an output pin P6, an input pin P7, an input pin P8, a bias adjustment pin P9, and a positive power supply pin P10.

[0023] The second anti-distortion unit includes resistors R12, R30, and R25. Resistor R12 and resistor R30 are connected in series. The series-connected resistors R12 and R30 are connected between input pin P8 and input pin P7 and are grounded.

[0024] One end of the resistor R25 is connected to the positive power supply pin P10, and the other end of the resistor R25 is connected between the resistor R12 and the resistor R30.

[0025] In some implementations, the feedback processing unit includes a capacitor C36 and a resistor R31 connected in parallel, with one end of the resistor R31 connected to the output pin P6 and the other end of the resistor R31 connected to the bias adjustment pin P9; one end of the capacitor C36 is connected to the common signal output terminal and the other end of the capacitor C36 is connected to the bias adjustment pin P9.

[0026] In some implementations, the frequency division cutoff unit includes a capacitor C38 and a resistor R32 connected in series, a capacitor C39 and a resistor R33 connected in series, and the capacitor C38 and the resistor R32 connected in series are connected in parallel with the capacitor C39 and the resistor R33 connected in series.

[0027] In summary, this application has at least the following advantages:

[0028] The wireless and wired microphone amplifier audio circuit provided in this application receives the wired signal from the wired signal input terminal and passes through a first signal processing module to perform signal feedback and frequency division feedback on the wired signal, thus achieving preliminary processing of the wired signal. The signal initially processed by the first signal processing module is then input to a second signal processing module, causing the wired signal to be amplified, fed back, and frequency divided again. At the same time, the wireless signal is also input to the second signal processing module for processing. Finally, the wired and wireless signals are output through a first output terminal. In this way, the wired and wireless microphone signals coexist, effectively reducing the sound quality difference between the wireless and wired microphone signals, ensuring good sound quality, and avoiding severe signal attenuation, thus effectively ensuring the stability of the signal output. Attached Figure Description

[0029] Figure 1This is a schematic diagram of the audio circuit structure of the wireless and wired microphone amplifier in Embodiment 1 of this application.

[0030] Figure 2 This is a schematic diagram of the structure of the first signal processing module shown in Embodiment 2 of this application.

[0031] Figure 3 This is a schematic diagram of the structure of the second signal processing module shown in Embodiment 3 of this application.

[0032] Marked in the image:

[0033] 1. Wired microphone module, 11. First signal processing module, 111. First anti-distortion unit, 112. Signal feedback unit, 113. Frequency division feedback unit, 114. Filtering unit; 2. Wireless microphone module, 21. Second signal processing module, 211. Second anti-distortion unit, 212. Feedback processing unit, 213. Frequency division cutoff unit; MIC1_IN, wired signal input terminal, MIC_OUT2, wired signal output terminal, MIC_IN, wireless signal input terminal, MIC_OUT, common signal output terminal. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are only some embodiments of this application, not all embodiments.

[0035] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0036] Example 1:

[0037] Please see the appendix Figure 1 The wireless and wired microphone amplifier audio circuit of this application includes a wired microphone module 1 and a wireless microphone module 2.

[0038] The wired microphone module includes a wired signal input terminal MIC1_IN, a first signal processing module 11, and a wired signal output terminal MIC_OUT2. The first signal processing module 11 is connected between the wired signal input terminal MIC1_IN and the wired signal output terminal MIC_OUT2.

[0039] The wireless microphone module 2 includes a wireless signal input terminal MIC_IN, a second signal processing module 21, and a common signal output terminal MIC_OUT. The second signal processing module 21 includes a first input terminal, a second input terminal, and a first output terminal. The wireless signal input terminal MIC_IN is connected to the first input terminal, the wired signal output terminal MIC_OUT2 is connected to the second input terminal, and the common signal output terminal MIC_OUT is connected to the first output terminal.

[0040] In this embodiment, the audio circuit transmits the wired signal to the first signal processing module 11 via the wired signal input terminal MIC1_IN to perform preliminary processing on the wired signal, thereby ensuring that some signal attenuation to ground maintains signal integrity. Next, the processed wired signal output from the first signal processing module 11 is transmitted to the second signal processing module 21 via the second input terminal for secondary processing. This further amplifies, feeds back, and divides the wired signal, before outputting it from the first output terminal. After processing, the wired signal is directly sent to the volume control, power amplifier, and speaker output.

[0041] At the same time, the wireless signal is transmitted to the second signal processing module 21 through the first input terminal, so that the second signal processing module 21 amplifies, feeds back, and divides the wireless signal, and outputs it from the first output terminal. Thus, the wired and wireless microphone signals coexist, effectively reducing the sound quality difference between the wireless and wired microphone signals and ensuring good sound quality. In addition, it can also avoid the phenomenon of severe signal attenuation and effectively ensure the stability of signal output.

[0042] Example 2:

[0043] The difference between this embodiment and Embodiment 1 is that, please refer to... Figure 2 The first signal processing module 11 in this embodiment includes an operational amplifier chip U6, a first anti-distortion unit 111, a signal feedback unit 112, and a frequency division feedback unit 113. The operational amplifier chip U6 is connected to the first anti-distortion unit 111 and the signal feedback unit 112, and the frequency division feedback unit 113 is connected between the signal feedback unit 112 and the wired signal output terminal MIC_OUT2.

[0044] The operational amplifier chip U6 has an input pin P2, an input pin P3, an output pin P1, a bias adjustment pin P4, and a positive power supply pin P5.

[0045] In this embodiment, the first signal processing module 11 uses a signal feedback unit 112 and a frequency division feedback unit 113 to perform signal feedback and frequency division feedback on the wired signal, which can prevent oscillation or instability and effectively improve the stability of the circuit. Furthermore, the first anti-distortion unit 111 ensures that the wired signal will not be clipped or saturated, effectively avoiding distortion. This embodiment effectively ensures circuit stability and improves signal quality.

[0046] The first anti-distortion unit 111 includes resistors R65, R66, and R67. Resistors R65 and R66, connected in series, are between input pins P2 and P3, with one end of resistor R65 connected to input pin P3 and one end of resistor R66 grounded. One end of resistor R67 is connected to the positive power supply pin P5, and the other end of resistor R67 is connected between resistors R65 and R66. Resistors R65, R66, and R67 provide a reference voltage of approximately 2.1V. This appropriate bias voltage ensures that the operational amplifier or other amplifiers operate within their linear operating region, preventing wired signals from being clipped or saturated, effectively avoiding distortion.

[0047] In some embodiments, the signal feedback unit 112 includes a resistor R59, one end of which is connected to the output pin P1, and the other end of which is connected to the bias adjustment pin P4. In the amplifier circuit, signal feedback is provided through the resistor R59. The resistor R59 can be used to set the circuit gain. By adjusting the feedback resistor value, the circuit gain can be changed, ensuring that the amplitude of the output signal meets design requirements, thereby improving the circuit stability.

[0048] In some embodiments, the frequency division feedback unit 113 includes a capacitor C63, a capacitor C22, and a resistor R19. The capacitor C63 is connected in parallel with the resistor R59, and one end of the capacitor C63 is connected to the wired signal output terminal MIC_OUT2. The capacitor C22 is connected in series with the resistor R19, and the series capacitor C22, the resistor R19, and the capacitor C63 are connected in parallel.

[0049] By configuring the frequency division feedback unit 113, capacitors C63 and C22 can be used as components of high-pass or low-pass filters. By selecting appropriate capacitor and resistor values, the cutoff frequency of the circuit can be set, allowing signals within a specific frequency range to pass while suppressing signals of other frequencies. Furthermore, resistor R19, as a feedback resistor, can adjust the amplifier's gain. By changing the value of resistor R19, the degree of feedback can be affected, thereby controlling the amplitude of the output signal. The frequency division feedback unit 113 in this embodiment can improve the stability of amplifiers or other signal processing circuits, preventing oscillations or instability.

[0050] In some embodiments, the first signal processing module 11 further includes a filtering unit 114, which includes a capacitor C64 and a resistor R60. One end of the resistor R60 is connected to the bias adjustment pin P4, and the other end of the resistor R60 is grounded. With this configuration, the capacitor C64 and the resistor R60 work together to effectively filter out high-frequency signals, eliminating unwanted high-frequency components by grounding. This helps protect the stability of subsequent circuits and improves signal quality.

[0051] Example 3:

[0052] The difference between this embodiment and Embodiment 2 is that, please refer to... Figure 3 The second signal processing module 21 in this embodiment includes an operational amplifier chip U7, a second anti-distortion unit 211, a feedback processing unit 212, and a frequency division cutoff unit 213; the second anti-distortion unit 211 is connected between the operational amplifier chip U7 and ground; the feedback processing unit 212 is connected between the operational amplifier chip U7 and the common signal output terminal MIC_OUT; and the frequency division cutoff unit 213 is connected between the operational amplifier chip U7 and ground.

[0053] In this embodiment, the second signal processing module 21 performs secondary processing on the wired signal, amplifying, feeding back, and dividing it again to complete the processing of the wired signal. Simultaneously, the second signal processing module 21 amplifies, feeds back, and divides the wireless signal to achieve wireless signal processing, enabling the coexistence of wired and wireless microphone signals, reducing signal attenuation in the circuit, and effectively ensuring circuit quality.

[0054] In some embodiments, the operational amplifier chip U7 includes an output pin P6, an input pin P7, an input pin P8, a bias adjustment pin P9, and a positive power supply pin P10.

[0055] The second anti-distortion unit 211 includes resistors R12, R30, and R25. Resistors R12 and R30 are connected in series. The series-connected resistors R12 and R30 are connected between input pin P8 and input pin P7 and are grounded. One end of resistor R25 is connected to the positive power supply pin P10, and the other end of resistor R25 is connected between resistors R12 and R30.

[0056] The second distortion unit in this embodiment can provide a reference voltage of approximately 2.1V through resistors R12, R30, and R25. Its appropriate bias voltage can ensure that the operational amplifier or other amplifiers operate within their linear operating region, so that the wired signal is not clipped or saturated, effectively avoiding distortion.

[0057] In some embodiments, the feedback processing unit 212 includes a capacitor C36 and a resistor R31 connected in parallel, with one end of the resistor R31 connected to the output pin P6 and the other end of the resistor R31 connected to the bias adjustment pin P9; one end of the capacitor C36 is connected to the common signal output terminal MIC_OUT and the other end of the capacitor C36 is connected to the bias adjustment pin P9.

[0058] Through the configuration of the feedback processing unit 212, resistor R31, acting as a feedback resistor, can adjust the amplifier's gain. By changing the resistance value of R31, the degree of feedback can be affected, thereby controlling the amplitude of the output signal. Understandably, a larger feedback resistor will reduce the gain, while a smaller feedback resistor will increase the gain. Capacitor C36, as a capacitor, can introduce phase compensation, helping to improve the circuit's phase characteristics, reduce phase delay, and ensure system stability at high frequencies. Resistor R31 and capacitor C36 can form an RC filter, affecting the circuit's frequency response. By selecting appropriate resistor and capacitor values, the circuit's cutoff frequency can be set, allowing signals within a specific frequency range to pass while suppressing signals of other frequencies. This configuration improves the overall circuit stability.

[0059] In some embodiments, the frequency division cutoff unit 213 includes a capacitor C38 and a resistor R32 connected in series, and a capacitor C39 and a resistor R33 connected in series, with the capacitor C38 and resistor R32 connected in parallel with the capacitor C39 and resistor R33. With this configuration, the combination of capacitor C38 and resistor R32, and capacitor C39 and resistor R33, functions as a frequency divider in the circuit. By setting the cutoff frequency and influencing the frequency response, signals can be effectively processed, improving circuit performance.

[0060] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0061] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. These terms are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0062] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply 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 tilted.

[0063] In this application, unless otherwise expressly specified and limited, "above or below" a first feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on" a first feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" a first feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0064] Although the description of this application has been made in conjunction with the specific embodiments described above, it is obvious to those skilled in the art that many substitutions, modifications, and variations can be made based on the above description. Therefore, all such substitutions, modifications, and variations are included within the spirit and scope of the appended claims.

Claims

1. An audio circuit for a wireless or wired microphone amplifier, characterized in that, include A wired microphone module, comprising a wired signal input terminal, a first signal processing module, and a wired signal output terminal, wherein the first signal processing module is connected between the wired signal input terminal and the wired signal output terminal; as well as A wireless microphone module includes a wireless signal input terminal, a second signal processing module, and a common signal output terminal. The second signal processing module includes a first input terminal, a second input terminal, and a first output terminal. The wireless signal input terminal is connected to the first input terminal, the wired signal output terminal is connected to the second input terminal, and the common signal output terminal is connected to the first output terminal.

2. The wireless and wired microphone amplifier audio circuit according to claim 1, characterized in that... The first signal processing module includes an operational amplifier chip U6, a first anti-distortion unit, a signal feedback unit, and a frequency division feedback unit. The operational amplifier chip U6 is connected to the first anti-distortion unit and the signal feedback unit, and the frequency division feedback unit is connected between the signal feedback unit and the wired signal output terminal.

3. The wireless and wired microphone amplifier audio circuit according to claim 2, characterized in that, The operational amplifier chip U6 has an input pin P2, an input pin P3, an output pin P1, a bias adjustment pin P4, and a positive power supply pin P5. The first anti-distortion unit includes resistors R65, R66, and R67. Resistors R65 and R66, connected in series, are connected between input pin P2 and input pin P3. One end of resistor R65 is connected to input pin P3, and one end of resistor R66 is grounded. One end of resistor R67 is connected to the positive power supply pin P5, and the other end of resistor R67 is connected between resistors R65 and R66.

4. The wireless and wired microphone amplifier audio circuit according to claim 3, characterized in that, The signal feedback unit includes a resistor R59, one end of which is connected to the output pin P1, and the other end of which is connected to the bias adjustment pin P4.

5. The wireless and wired microphone amplifier audio circuit according to claim 4, characterized in that, The frequency division feedback unit includes capacitor C63, capacitor C22 and resistor R19. Capacitor C63 is connected in parallel with resistor R59, and one end of capacitor C63 is connected to the wired signal output terminal. The capacitor C22 is connected in series with the resistor R19, and the series-connected capacitor C22, resistor R19 and capacitor C63 are connected in parallel.

6. The wireless and wired microphone amplifier audio circuit according to claim 5, characterized in that, The first signal processing module further includes a filtering unit, which includes a capacitor C64 and a resistor R60. One end of the resistor R60 is connected to the bias adjustment pin P4, and the other end of the resistor R60 is connected to ground.

7. The wireless and wired microphone amplifier audio circuit according to claim 1, characterized in that, The second signal processing module includes an operational amplifier chip U7, a second anti-distortion unit, a feedback processing unit, and a frequency division cutoff unit; The second anti-distortion unit is connected between the operational amplifier chip U7 and ground; The feedback processing unit is connected between the operational amplifier chip U7 and the common signal output terminal; The frequency division cutoff unit is connected between the operational amplifier chip U7 and ground.

8. The wireless and wired microphone amplifier audio circuit according to claim 7, characterized in that, The operational amplifier chip U7 includes an output pin P6, an input pin P7, an input pin P8, a bias adjustment pin P9, and a positive power supply pin P10. The second anti-distortion unit includes resistors R12, R30, and R25. Resistor R12 and resistor R30 are connected in series. The series-connected resistors R12 and R30 are connected between input pin P8 and input pin P7 and are grounded. One end of the resistor R25 is connected to the positive power supply pin P10, and the other end of the resistor R25 is connected between the resistor R12 and the resistor R30.

9. The wireless and wired microphone amplifier audio circuit according to claim 8, characterized in that, The feedback processing unit includes a capacitor C36 and a resistor R31 connected in parallel. One end of the resistor R31 is connected to the output pin P6, and the other end of the resistor R31 is connected to the bias adjustment pin P9. One end of the capacitor C36 is connected to the common signal output terminal, and the other end of the capacitor C36 is connected to the bias adjustment pin P9.

10. The wireless and wired microphone amplifier audio circuit according to claim 9, characterized in that, The frequency division cutoff unit includes a capacitor C38 and a resistor R32 connected in series, a capacitor C39 and a resistor R33 connected in series, and the capacitor C38 and the resistor R32 connected in series are connected in parallel with the capacitor C39 and the resistor R33 connected in series.

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