A super high frequency wireless microphone receiving device

Abstract

The utility model provides a kind of ultrahigh frequency wireless loudspeaker receiving device, including receiving module, pre-processing module, the receiving module is used to receive the wireless signal of single microphone, and demodulation is audio signal output;The number of the receiving module is consistent with the number of the microphone set, multiple the receiving module one-to-one corresponding receiving multiple microphone wireless signal, and demodulation is audio signal output;The receiving module is electrically connected with pre-processing module, and the pre-processing module is used to carry out gain, the pre-processing of amplification to audio signal.The utility model has the advantages of improving the compatibility, stability and fidelity of system, applicable to synchronous reception one to multiple microphones, beneficial to prevent distortion, missing tone, howling and other audio problems.

Description

Technical Field

[0001] This utility model relates to the technical field of loudspeakers, and in particular to a UHF wireless loudspeaker receiving device. Background Technology

[0002] Wireless loudspeakers typically connect to microphones via wireless communication technology. A receiver on the loudspeaker acquires the signal from the microphone, which is then amplified by an audio gain device to achieve the amplification effect. Ultra High Frequency (UHF) refers to the radio wave frequency band between 300MHz and 3GHz. It is an important frequency band for wireless transmission, offering both medium- and long-distance transmission and interference resistance. It can stably transmit signals between the loudspeaker and microphone, avoiding the congestion of low-frequency bands and the weak penetration of microwave bands.

[0003] Currently, in complex acoustic environments, loudspeakers need to simultaneously receive audio signals from multiple microphones and perform signal processing and playback. For example, existing technologies for dual-microphone UHF wireless loudspeaker receivers, refer to... Figure 1 The system includes antenna 1, antenna 2, a signal splitter unit, UHF wireless chip 1, UHF wireless chip 2, and a pre-amplification unit. Antenna 1 and antenna 2 are used to receive wireless signals from two microphones, respectively. Antenna 1, antenna 2, UHF wireless chip 1, and UHF wireless chip 2 are all electrically connected to the signal splitter unit. The signal splitter unit sends the signal from antenna 1 to UHF wireless chip 1 and the signal from antenna 2 to UHF wireless chip 2, while simultaneously performing pre-processing such as filtering and impedance matching on the signals. UHF wireless chips 1 and 2 are used to demodulate the wireless signals into audio signals. The pre-amplification unit performs pre-processing such as filtering and amplification on the audio signals. In use, the wireless signals from the microphones are received through antenna 1 / antenna 2. The signal splitter unit sends the signal from antenna 1 to UHF wireless chip 1 and the signal from antenna 2 to UHF wireless chip 2, while simultaneously performing pre-processing such as filtering and impedance matching on the signals. After the wireless signals are demodulated into audio signals by UHF wireless chips 1 / 2, they are all aggregated to the pre-amplification unit for pre-processing, and finally the audio signal is output.

[0004] However, when using existing wireless loudspeaker receivers, the signals are easily mixed and confused in the signal splitting unit when receiving wireless signals from two or more microphones at the same time. This results in signals that are difficult to coexist and lack transmission stability, which in turn leads to problems such as distortion, missing sound, and howling in the final audio output of the loudspeaker. Utility Model Content

[0005] To address the problems of signal mixing and confusion in the signal splitting unit when simultaneously receiving wireless signals from two or more microphones, resulting in incompatible signal coexistence and unstable transmission, this invention provides an ultra-high frequency wireless loudspeaker receiver that improves system compatibility, stability, and fidelity.

[0006] This utility model provides a UHF wireless loudspeaker receiver device, which adopts the following technical solution:

[0007] A UHF wireless loudspeaker receiver device, comprising:

[0008] A receiving module is provided, which is used to receive the wireless signal from a single microphone and demodulate it into an audio signal for output. The number of receiving modules is consistent with the number of microphones provided, and multiple receiving modules correspond one-to-one to receive the wireless signals from multiple microphones and demodulate them into audio signals for output.

[0009] The preprocessing module is electrically connected to the receiving module. The preprocessing module is used to perform preprocessing on the audio signal by increasing its gain and amplifying it.

[0010] By adopting the above technical solution, each microphone receives and processes wireless signals through an independent receiving module, outputting an audio signal from that single microphone. At the physical channel level, the wireless signal from each microphone is completely independent and demodulated into an independent audio signal. This avoids competition and interference between radio frequency signals at the source, prevents noise from occurring in the early stages of reception, and ensures the purity and recognizability of each audio source. Then, the audio signals are merged in a preprocessing module to achieve signal standardization, and finally, high-quality output is achieved through collaborative amplification. This approach of isolation, standardization, and collaborative amplification solves the compatibility, stability, and fidelity problems in multi-channel wireless audio systems, preventing incompatible signals and unstable transmission that could lead to distortion, missing sound, and feedback in the final audio output from the amplifier.

[0011] Preferably, the receiving module includes an interface electrically connected to the preprocessing module, a receiving unit electrically connected to the interface, and a pre-amplification unit electrically connected to both the interface and the receiving unit; the interface is used to enable signal interaction between the receiving module and the preprocessing module and to access external power; the receiving unit is used to receive the wireless signal from a single microphone and demodulate it into an audio signal; the pre-amplification unit is used to perform preliminary signal amplification on the received audio signal.

[0012] By adopting the above technical solution, the receiving module, through the collaborative design of the interface, receiving unit and pre-amplification unit, can not only stably realize signal interaction with the preprocessing module and external power access, ensuring the reliability of basic functions; it can also accurately receive and demodulate the wireless signal of a single microphone, and can also preliminarily amplify the audio signal, laying a clear and strong signal foundation for subsequent signal processing, and improving the efficiency and quality of overall audio signal processing.

[0013] Preferably, the receiving unit includes a voltage regulator electrically connected to the interface, a wireless chip electrically connected to the voltage regulator, and an antenna electrically connected to the wireless chip; the voltage regulator is used to regulate the external power supply and output the low-voltage power required by the wireless chip; the antenna is used to receive wireless signals transmitted from a single microphone; and the wireless chip is used to demodulate the wireless signals into audio signals.

[0014] By adopting the above technical solution, the receiving unit ensures stable power supply to the wireless chip through a voltage regulator, and combines the antenna to accurately receive the wireless signal from a single microphone with the efficient demodulation of the wireless chip, thus ensuring stable operation of the core components and reliable acquisition and conversion of audio signals.

[0015] Preferably, the receiving unit further includes a memory electrically connected to the wireless chip, the memory being used for temporary data storage and historical data recording.

[0016] By adopting the above technical solution, the newly added memory of the receiving unit can realize temporary data storage and historical records, and can retain historical information for subsequent tracing or analysis.

[0017] Preferably, the pre-amplification unit includes an operational amplifier electrically connected to the wireless chip, the operational amplifier being used to initially amplify the audio signal.

[0018] By adopting the above technical solution, the operational amplifier initially amplifies the audio signal, which can enhance the strength of weak signals, provide a clearer signal basis for subsequent processing, and improve the effectiveness of audio signal processing.

[0019] Preferably, the preprocessing module includes a filtering and frequency division unit electrically connected to the interface, and a signal amplification unit electrically connected to the filtering and frequency division unit; the filtering and frequency division unit is used to filter and divide the audio signal; the signal amplification unit amplifies the audio signal and then outputs it.

[0020] By adopting the above technical solution, the preprocessing module optimizes the frequency band of the audio signal using the filtering and frequency division unit, and with the gain amplification function of the signal amplification unit, it can effectively reduce signal interference and enhance signal transmission capability, laying a high-quality signal foundation for subsequent audio processing stages.

[0021] Preferably, the filtering and frequency division unit includes a pre-processing unit and a fine-tuning unit electrically connected to the pre-processing unit; the pre-processing unit is used to pre-filter and divide the audio signal, and the number of pre-processing units is set according to the number of receiving modules, with multiple pre-processing units electrically connected to multiple receiving modules one-to-one; the fine-tuning unit is electrically connected to the pre-processing unit, and the fine-tuning unit is used to perform secondary filtering and frequency division on the audio signal.

[0022] By adopting the above technical solution, in the filtering and frequency division unit, the pre-processing unit corresponds one-to-one with the receiving module, which can accurately pre-filter and divide the audio signals of each module to avoid interference between multiple module signals; the fine-tuning processing unit is connected to all pre-processing units to complete secondary filtering and frequency division, and can also merge audio signals from multiple frequency division capacitors, which not only ensures the initial purity of a single signal, but also improves the overall signal accuracy and integration through secondary optimization and signal merging, adapting to subsequent processing requirements.

[0023] Preferably, the pre-processing unit includes a buffer resistor and a frequency divider capacitor electrically connected to the buffer resistor; one end of the buffer resistor is electrically connected to the interface, and the other end of the frequency divider capacitor is electrically connected to the fine-tuning processing unit.

[0024] By adopting the above technical solution, during operation, the audio signal passes through a buffer resistor, which buffers and reduces the voltage of the audio signal. Then, the audio signal passes through a frequency divider capacitor for frequency division, filtering out the desired frequency band sound quality, thus realizing pre-filtering and frequency division of the audio signal.

[0025] Preferably, the signal amplification unit includes a bias processing section, a preamplifier section electrically connected to the bias processing section, and a secondary amplifier section electrically connected to both the bias processing section and the preamplifier section; the bias processing section is used to receive a DC bias voltage and perform filtering; the preamplifier section is used to initially amplify the audio signal, and the secondary amplifier section is used to further amplify the audio signal and output it.

[0026] By adopting the above technical solution, the audio signal is effectively amplified and processed in multiple stages, ensuring the stability and clarity of the output audio signal.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] Each microphone receives and processes wireless signals through an independent receiving module, outputting an audio signal from that single microphone. At the physical channel level, the wireless signal from each microphone is completely independent and demodulated into an independent audio signal. This avoids competition and interference between radio frequency signals at the source, preventing noise in the early stages of reception and ensuring the purity and recognizability of each audio source. The audio signals are merged in a preprocessing module to achieve signal standardization, and finally, high-quality output is achieved through collaborative amplification. This technology is suitable for loudspeakers that simultaneously receive wireless signals from one or more microphones; the number of receiving modules can be adjusted according to the number of microphones.

[0029] By adopting a scheme of isolation first, standardization then, and collaborative amplification, the problems of compatibility, stability and fidelity in multi-channel wireless audio systems are solved, preventing the incompatibility and coexistence of signals and the lack of transmission stability, which in turn leads to problems such as distortion, missing sound and howling in the final audio output of the loudspeaker. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 It is a circuit logic diagram of the prior art in the background technology.

[0032] Figure 2 This is a circuit logic diagram of the receiving module and the preprocessing module in an embodiment of this utility model.

[0033] Figure 3 This is a circuit diagram of the interface and preprocessing module in an embodiment of this utility model.

[0034] Figure 4 This is a circuit logic diagram of the receiving module in an embodiment of this utility model.

[0035] Figure 5 This is a circuit diagram of the interface and the pre-processing unit in an embodiment of this utility model.

[0036] Figure 6 This is a circuit diagram of the filter frequency division unit in an embodiment of this utility model.

[0037] Figure 7 This is a circuit diagram of the signal amplification unit in an embodiment of this utility model.

[0038] The component labels are as follows: 1. Receiving module; 11. Interface; 12. Receiving unit; 13. Pre-amplification unit; 2. Preprocessing module; 21. Filtering and frequency division unit; 211. Pre-processing section; 2111. Buffer resistor; 2112. Frequency division capacitor; 212. Fine-tuning section; 22. Signal amplification unit; 221. Parallel processing section; 222. Pre-amplification section; 223. Secondary amplification section. Detailed Implementation

[0039] The following will refer to the appendix in the embodiments of this utility model. Figures 2 to 7 The technical solutions in the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0040] A UHF wireless loudspeaker receiver device, as described in the reference Figure 2 and Figure 3 The system includes a receiving module 1 and a preprocessing module 2. The receiving module 1 receives the wireless signal from a single microphone and demodulates it into an audio signal for output. The number of receiving modules 1 corresponds to the number of microphones; that is, the number of receiving modules 1 follows the number of microphones. Multiple receiving modules 1 correspond one-to-one with multiple microphones to receive their wireless signals and demodulate them into audio signals for output. Each receiving module 1 is electrically connected to the preprocessing module 2, which performs preprocessing on the audio signal, including gain and amplification.

[0041] In this embodiment, refer to Figure 2 and Figure 4 The system has two microphones, and the receiving module 1 corresponds to two microphones. Both receiving modules 1 are electrically connected to the preprocessing module 2. Specifically, the receiving module 1 includes an interface 11 electrically connected to the preprocessing module 2, a receiving unit 12 electrically connected to the interface 11, and a pre-amplification unit 13 electrically connected to both the interface 11 and the receiving unit 12. The interface 11 is used to enable signal interaction between the receiving module 1 and the preprocessing module 2 and to access external power. The receiving unit 12 is used to receive the wireless signal from a single microphone and demodulate it into an audio signal. The pre-amplification unit 13 is used to perform preliminary signal amplification on the received audio signal.

[0042] Reference Figure 4 and Figure 5Interface 11 is existing technology. The fifth pin (5V_IN) of interface 11 is connected to external power (UHF_5V). In this embodiment, the external power is 5V DC, and the fourth pin of interface 11 is grounded. External power is connected through interface 11 to power the receiving unit 12 and the pre-amplification unit 13.

[0043] Specifically, refer to Figure 5 The receiving unit 12 includes a voltage regulator electrically connected to the fifth pin of the interface 11, a wireless chip electrically connected to the voltage regulator, and an antenna electrically connected to the wireless chip. The voltage regulator is used to regulate the incoming external power and output the low-voltage power required by the wireless chip. The antenna is used to receive wireless signals transmitted from a single microphone in the UHF band. The wireless chip is used to demodulate the wireless signals into audio signals.

[0044] Reference Figure 5 The voltage regulator, model CKUGG, enables the wireless chip to function properly. The low-voltage power is 3.3V DC, meaning the regulator stably converts the input 5V voltage to a 3.3V output voltage. The wireless chip, model KT0651, is also electrically connected to the pre-amplification unit 13. When using the corresponding microphone, the antenna receives the UHF band wireless signal emitted by the microphone. The wireless chip demodulates the audio signal from the UHF band wireless signal and finally transmits the audio signal to the pre-amplification unit 13.

[0045] In addition, refer to Figure 5 The receiving unit 12 also includes a memory electrically connected to the wireless chip. The memory is an FT24C128A model and is used for temporary data storage and historical data recording. The memory supports 5V power supply. The fifth pin of the interface 11 is also electrically connected to the memory to allow the memory to access external power and ensure normal operation. In use, the memory interacts with the wireless chip, receives and stores audio signals transmitted by the wireless chip, and stores intermediate data generated by the pre-amplification unit 13 during signal processing.

[0046] Specifically, refer to Figure 5 The pre-amplification unit 13 includes an operational amplifier electrically connected to the wireless chip. The operational amplifier is used for preliminary amplification of the audio signal. Operational amplifiers are existing technology and commonly used for signal amplification, so they will not be described in detail. In this embodiment, the operational amplifier is a TS2254A model and supports 5V power supply. The power supply pin of the operational amplifier is electrically connected to the fifth pin of interface 11 for external power input. The input pin of the operational amplifier is electrically connected to the wireless chip, and the output pin of the operational amplifier is electrically connected to the first pin (AUDIO pin) of interface 11.

[0047] In use, the operational amplifier is powered by the external power supply to ensure that the operational amplifier works normally. The operational amplifier acquires the audio signal from the wireless chip and performs preliminary amplification. Finally, the amplified audio signal is output to the preprocessing module 2 through interface 11.

[0048] Since each microphone is independently received and processed by a single receiving module 1, the audio signal of each microphone is separated and output after adjustment and processing within the single receiving module 1, thus avoiding audio signal mixing and recognition confusion.

[0049] Specifically, refer to Figure 6 and Figure 7 The preprocessing module 2 includes a filtering and frequency division unit 21 electrically connected to interface 11, and a signal amplification unit 22 electrically connected to the filtering and frequency division unit 21. The filtering and frequency division unit 21 is used to filter and divide the audio signal. The signal amplification unit 22 amplifies the audio signal before outputting it.

[0050] Reference Figure 5 and Figure 6 The filtering and frequency division unit 21 includes a pre-processing unit 211 and a fine-tuning unit 212 electrically connected to the pre-processing unit 211. The pre-processing unit 211 is used for pre-filtering and frequency division of the audio signal. The number of pre-processing units 211 corresponds to the number of receiving modules 1. Multiple pre-processing units 211 are electrically connected to the interfaces 11 of multiple receiving modules 1, that is, there are two pre-processing units 211, and the two pre-processing units 211 are electrically connected to the first pins of two interfaces 11. The fine-tuning unit 212 is electrically connected to the pre-processing unit 211 and is used for secondary filtering and frequency division of the audio signal.

[0051] Furthermore, refer to Figure 5 and Figure 6 The pre-processing unit 211 includes a buffer resistor 2111 and a frequency divider capacitor 2112. One end of the buffer resistor 2111 is electrically connected to the first pin of the interface 11, and the other end of the buffer resistor 2111 is electrically connected to one end of the frequency divider capacitor 2112. The other end of the frequency divider capacitor 2112 is electrically connected to the fine-tuning processing unit 212. During operation, the audio signal passes through the buffer resistor 2111, which buffers and reduces the voltage of the audio signal. Then, the audio signal passes through the frequency divider capacitor 2112 for frequency division, filtering out the desired frequency band sound quality, thus realizing pre-filtering and frequency division of the audio signal. The audio signals output from the two pre-processing units 211 are then combined, subjected to secondary filtering, and frequency division in the fine-tuning processing unit 212.

[0052] Reference Figure 6The fine-tuning processing unit 212 includes a 55th resistor R55, a 74th capacitor C74, and a 52nd resistor R52. The 55th resistor R55 is electrically connected to the frequency division capacitors 2112 of the multiple pre-processing units 211. In this embodiment, the 55th resistor R55 is electrically connected to the frequency division capacitors 2112 of two pre-processing units 211. The 74th capacitor C74 is 560pF. The other end of the 55th resistor R55 is electrically connected to one end of the 74th capacitor C74, and the other end of the 74th capacitor C74 is grounded. The 52nd resistor R52 is a variable resistor. The other end of the 55th resistor R55 is also electrically connected to one end of the 52nd resistor R52, and the other end of the 52nd resistor R52 is electrically connected to the signal amplification unit 22.

[0053] During operation, audio signals from multiple frequency divider capacitors 2112 are combined. The combined audio signal is then buffered and voltage-dropped again by resistor R55 (55th resistor), protecting and stabilizing the input to subsequent circuits. Capacitor C74 (74th capacitor) allows high-frequency components to pass through and connect to ground, while presenting high impedance to low-frequency signals, thus filtering out high-frequency noise and making the audio signal cleaner. Finally, the audio signal is divided by resistor R52 (52nd resistor) before entering signal amplification unit 22. Since resistor R52 is a variable resistor, its value can be adjusted to modify the audio signal according to different application scenarios and the needs of subsequent circuits.

[0054] Specifically, refer to Figure 7 The signal amplification unit 22 includes a bias processing unit 221, a preamplifier 222 electrically connected to the bias processing unit 221, and a secondary amplifier 223 electrically connected to both the bias processing unit 221 and the preamplifier 222. The bias processing unit 221 is used to apply a DC bias voltage and perform filtering. The preamplifier 222 is used to initially amplify the audio signal. The secondary amplifier 223 is used to further amplify the audio signal and output it.

[0055] Reference Figure 7The paralysis processing unit 221 includes an operational amplifier U15-C and a 21st resistor R21. The operational amplifier U15-C is an SGM8632. One end of the 21st resistor R21 is connected to a DC bias voltage of 25V, with +5V as its reference ground. The other end of the 21st resistor R21 is electrically connected to the positive power supply pin (V+ pin) of the operational amplifier U15-C. The other end of the 21st resistor R21 is also electrically connected to the 54th capacitor C54, and the other end of the 54th capacitor C54 is electrically connected to the negative power supply pin (V- pin) of the operational amplifier U15-C. The other end of the 54th capacitor C54 is also grounded. The other end of the 21st resistor R21 is also electrically connected to the 53rd capacitor C53, and the other end of the 53rd capacitor C53 is also electrically connected to the negative power supply pin (V- pin) of the operational amplifier U15-C. The other end of the 53rd capacitor C53 is also grounded. The other end of resistor R21 (21st) is electrically connected to resistor R22 (22nd), which in turn is electrically connected to capacitor C1 (1st), which is electrically connected to the negative power supply pin of operational amplifier U15-C. The other end of capacitor C1 is also grounded. The other end of resistor R22 (22nd) is electrically connected to capacitor C55 (55th), which is also electrically connected to the negative power supply pin of operational amplifier U15-C. The other end of capacitor C55 is also grounded. The other end of resistor R22 (22nd) is electrically connected to resistor R23 (23rd), which is also electrically connected to the negative power supply pin of operational amplifier U15-C. The other end of resistor R23 is also grounded. Resistor R22 (222) is electrically connected to both the preamplifier section 222 and the secondary amplifier section 223.

[0056] During operation, the DC bias voltage is +25V (reference point is +5V), meaning its absolute voltage to ground is +30V (25V + 5V). The DC bias voltage is filtered through resistor R21 (21st), capacitor C54 (54th), and capacitor C53 (53rd). Resistor R21 prevents instantaneous high current from the subsequent circuit from impacting the power supply of the preceding stage. A dual RC filter network is formed through resistor R22 (22nd), capacitor C1 (1st), capacitor C55 (55th), and resistor R23 (23rd), further filtering out residual low-frequency and power supply ripple. Capacitors C53 (53rd) and C54 (54th) absorb the high-frequency switching noise generated by the operational amplifier U15-C, making the DC bias voltage output to resistor R21 cleaner and more stable. At this time, the operational amplifier U15-C acts as a voltage buffer, providing a very stable and clean reference for other parts of the circuit. This ensures a clean and stable DC bias voltage for the preamplifier section 222 and the secondary amplifier section 223.

[0057] Specifically, refer to Figure 7 The preamplifier section 222 includes operational amplifier U15-A, model SGM8632. The other end of resistor 52 is electrically connected to the inverting input pin (IN- pin) of operational amplifier U15-A. The other end of resistor R52 is electrically connected to one end of capacitor C44, which in turn is electrically connected to one end of resistor R28, which is also electrically connected to the inverting input pin of operational amplifier U15-A. The other end of resistor R22 is electrically connected to one end of resistor R27, which is also electrically connected to the non-inverting input pin (IN+ pin) of operational amplifier U15-A. The other end of resistor R22 is also electrically connected to one end of capacitor C43, which is also electrically connected to the non-inverting input pin of operational amplifier U15-A. The output pin (OUT pin) of the operational amplifier U15-A is electrically connected to the secondary amplifier section 223.

[0058] During operation, the audio signal enters the operational amplifier U15-A from the inverting input pin. After being filtered by the 27th resistor R27 and the 43rd capacitor C43, the DC bias voltage enters the operational amplifier U15-A from the non-inverting input pin. The DC bias voltage sets the static operating point of the operational amplifier U15-A in the middle region of its single power supply range (0V to +30V or above), providing sufficient swing space for the audio signal and preventing cutoff distortion. The amplified audio signal is then output to the secondary amplification section 223 through the output pin of the operational amplifier U15-A.

[0059] Specifically, refer to Figure 7 The secondary amplification section 223 includes operational amplifier U15-B, and operational amplifier U15-A is model SGM8632. The output pin of operational amplifier U15-A is electrically connected to the seventeenth resistor R17, and the other end of the seventeenth resistor R17 is electrically connected to the inverting input pin (IN- pin) of operational amplifier U15-B. The other end of the forty-fourth capacitor C44 is also electrically connected to the seventeenth resistor R17. The other end of the seventeenth resistor R17 is electrically connected to the eighteenth resistor R18, and the other end of the eighteenth resistor R18 is electrically connected to the first resistor R1. The other end of the seventeenth resistor R17 is also electrically connected to the forty-ninth capacitor C49, and the other end of the forty-ninth capacitor C49 is electrically connected to the first resistor R1. The other end of the twenty-second resistor R22 is electrically connected to the non-inverting input pin (IN+ pin) of operational amplifier U15-B. The output pin (OUT pin) of operational amplifier U15-B is electrically connected to the first resistor R1. The other end of the first resistor R1 is electrically connected to the fiftieth capacitor C50.

[0060] During operation, U15-B acts as the second-stage amplifier, receiving the audio signal from U15-A. This audio signal enters operational amplifier U15-B through the inverting input pin, while the DC bias voltage enters through the non-inverting input pin. Amplification is further achieved through U15-B, with its amplification factor and frequency response precisely controlled by a feedback network consisting of resistors R17 (seventeenth), R18 (eighteenth), R1 (first), and C49 (forty-ninth). Capacitor C49 is specifically used to limit high-frequency bandwidth and suppress noise. The amplified audio signal is then filtered by capacitor C50, ultimately outputting the audio signal (UHF_AUDIO_OUT).

[0061] The implementation principle of this application is as follows: Each microphone receives and processes wireless signals through an independent receiving module 1, outputting an audio signal from that single microphone. At the physical channel level, the wireless signal from each microphone is completely independent and demodulated into an independent audio signal. This avoids competition and interference between radio frequency signals at the source, prevents noise from occurring in the early stages of reception, and ensures the purity and recognizability of each audio source. Then, the audio signals are merged in the fine-tuning processing unit 212 to achieve signal standardization, and finally, high-quality output is achieved through collaborative amplification. Furthermore, this technical solution is applicable to loudspeakers that simultaneously receive wireless signals from one or more microphones; the number of receiving modules 1 can be set according to the number of microphones.

[0062] By first isolating, then standardizing, and then amplifying collaboratively, the problems of compatibility, stability, and fidelity in multi-channel wireless audio systems are solved, preventing the incompatibility and instability of signals, which can lead to distortion, missing sound, and feedback in the final audio output of the amplifier.

[0063] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A UHF wireless loudspeaker receiver, characterized in that: include The receiving module (1) is used to receive the wireless signal from a single microphone and demodulate it into an audio signal for output. The number of receiving modules (1) is the same as the number of microphones. Each of the multiple receiving modules (1) receives the wireless signals from the multiple microphones and demodulates them into audio signals for output. The preprocessing module (2) and the receiving module (1) are both electrically connected to the preprocessing module (2). The preprocessing module (2) is used to perform preprocessing on the audio signal by increasing its gain and amplifying it.

2. The UHF wireless loudspeaker receiver according to claim 1, characterized in that: The receiving module (1) includes an interface (11) electrically connected to the preprocessing module (2), a receiving unit (12) electrically connected to the interface (11), and a pre-amplification unit (13) electrically connected to both the interface (11) and the receiving unit (12). The interface (11) is used to realize signal interaction between the receiving module (1) and the preprocessing module (2) and to access external power. The receiving unit (12) is used to receive the wireless signal from a single microphone and demodulate it into an audio signal. The pre-amplification unit (13) is used to perform preliminary signal amplification on the received audio signal.

3. The UHF wireless loudspeaker receiver according to claim 2, characterized in that: The receiving unit (12) includes a voltage regulator electrically connected to the interface (11), a wireless chip electrically connected to the voltage regulator, and an antenna electrically connected to the wireless chip; the voltage regulator is used to regulate the external power input and output the low-voltage power required by the wireless chip. The antenna is used to receive wireless signals emitted from a single microphone; the wireless chip is used to demodulate the wireless signals into audio signals.

4. The UHF wireless loudspeaker receiver device according to claim 3, characterized in that: The receiving unit (12) also includes a memory electrically connected to the wireless chip, which is used for temporary data storage and historical data recording.

5. The UHF wireless loudspeaker receiver according to claim 2, characterized in that: The pre-amplification unit (13) includes an operational amplifier electrically connected to the wireless chip, which is used to initially amplify the audio signal.

6. The UHF wireless loudspeaker receiver according to claim 1, characterized in that: The preprocessing module (2) includes a filtering and frequency division unit (21) electrically connected to the interface (11) and a signal amplification unit (22) electrically connected to the filtering and frequency division unit (21); the filtering and frequency division unit (21) is used to filter and divide the audio signal; the signal amplification unit (22) amplifies the audio signal and outputs it.

7. The UHF wireless loudspeaker receiver according to claim 6, characterized in that: The filtering and frequency division unit (21) includes a pre-processing unit (211) and a fine-tuning unit (212) electrically connected to the pre-processing unit (211). The pre-processing unit (211) is used to pre-filter and divide the audio signal. The number of pre-processing units (211) is set according to the number of receiving modules (1). Multiple pre-processing units (211) are electrically connected to multiple receiving modules (1) one by one. The fine-tuning unit (212) is electrically connected to the pre-processing unit (211). The fine-tuning unit (212) is used to perform secondary filtering and frequency division on the audio signal.

8. The UHF wireless loudspeaker receiver according to claim 7, characterized in that: The preprocessing unit (211) includes a buffer resistor (2111) and a frequency divider capacitor (2112) electrically connected to the buffer resistor (2111); one end of the buffer resistor (2111) is electrically connected to the interface (11), and the other end of the frequency divider capacitor (2112) is electrically connected to the fine-tuning unit (212).

9. The UHF wireless loudspeaker receiver according to claim 6, characterized in that: The signal amplification unit (22) includes a bias processing unit (221), a preamplifier (222) electrically connected to the bias processing unit (221), and a secondary amplifier (223) electrically connected to both the bias processing unit (221) and the preamplifier (222). The bias processing unit (221) is used to apply a DC bias voltage and perform filtering. The preamplifier (222) is used to initially amplify the audio signal, and the secondary amplifier (223) is used to amplify the audio signal again and output it.

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