A signal processing method, system, and chip for a wireless microphone receiver

Abstract

This application relates to the field of radio frequency signal processing technology, and in particular to a signal processing method for a wireless microphone receiver, comprising the following steps: S1, the receiver receives a radio frequency signal emitted by a wireless microphone from a receiving port to obtain a first processed signal; S2, the receiver performs difference frequency processing on the first processed signal to reduce its frequency to a set value to obtain a second processed signal; S3, the receiver performs sum frequency processing on the second processed signal to restore its frequency to the same as the first processed signal to obtain a third processed signal; S4, the receiver outputs the third processed signal from a transmission port. Furthermore, this application provides a system and chip for implementing this signal processing method for a wireless microphone receiver, which, through frequency downsampling followed by frequency upsampling, can effectively suppress image frequency interference, improve the receiver's selectivity and anti-interference capability, and reduce interference from adjacent frequency points during signal transmission.

Description

Technical Field

[0001] This application relates to the field of radio frequency signal processing technology, and in particular to a signal processing method, system and chip for a wireless microphone receiver. Background Technology

[0002] During use, a wireless microphone modulates an audio signal onto a radio frequency (RF) carrier wave via its transmitting antenna, forming an RF signal which is then transmitted. The receiver's antenna receives these RF signals and first sends them to the RF front-end for preliminary processing. The RF front-end typically includes a low-noise amplifier (LNA) to amplify the weak received RF signal while minimizing the introduction of noise.

[0003] When a receiver receives the radio frequency (RF) signal from a wireless microphone, it typically undergoes a first and second frequency conversion to reduce the RF signal frequency. The first conversion mixes the received RF signal with the signal generated by the first local oscillator (LO1), lowering the RF signal to a relatively high first intermediate frequency (IF1), typically 10.7MHz. This IF signal is then amplified and filtered to remove unwanted frequency components such as image frequencies and spurious signals, improving signal purity. The second conversion then mixes the IF signal again with the signal generated by the second local oscillator (LO2), lowering it to a fixed, lower final intermediate frequency (IF2), typically 455kHz. The beneficial effects of this frequency conversion method include: effectively suppressing image frequency interference, improving the selectivity and anti-interference capability of the receiver; after two intermediate frequency selective amplifications, the frequency selection characteristics are much better than those of a single frequency conversion method; it can also achieve higher signal amplification factor and is less prone to self-oscillation, making the system more stable.

[0004] With technological advancements, KT chips emerged that can directly read the radio frequency (RF) signals from wireless microphones. The advent of these chips simplifies receiver circuit design and reduces costs. However, because KT chips directly process RF signals, they lack the effects of frequency conversion. For example, they cannot effectively suppress image frequency interference like frequency conversion processes, leading to decreased anti-interference capabilities in complex electromagnetic environments. Furthermore, due to the lack of intermediate frequency (IF) amplification, their frequency selectivity is relatively poor, making them susceptible to interference from adjacent frequencies, affecting signal stability and clarity. Summary of the Invention

[0005] The purpose of this application is to provide a signal processing method, system, and chip for a wireless microphone receiver, which aims to solve the problems of decreased anti-interference capability and susceptibility to interference from adjacent frequency points.

[0006] In a first aspect, this application provides a signal processing method for a wireless microphone receiver, comprising the following steps: S1, the receiver receives the radio frequency signal emitted by the wireless microphone from the receiving port and obtains the first processing signal; S2, the receiver performs difference frequency processing on the first processed signal to reduce the frequency of the first processed signal to a set value to obtain the second processed signal; S3, the receiver performs sum-frequency processing on the second processed signal to restore the frequency of the second processed signal to the same as that of the first processed signal in order to obtain the third processed signal; S4, the receiver outputs the third processed signal from the transmission port.

[0007] The signal processing method for a wireless microphone receiver disclosed in this application can receive, process, and output radio frequency signals emitted by a wireless microphone. The frequency of the output third processed signal is the same as the frequency of the radio frequency signal emitted by the wireless microphone. By first down-converting and then up-converting the frequency, image frequency interference can be effectively suppressed, improving the selectivity and anti-interference capability of the receiver, reducing interference from adjacent frequency points received during signal transmission, and ensuring the frequency consistency of the signal throughout the entire processing process. This facilitates further processing and analysis of the signal by subsequent circuits, maintains the original characteristics of the signal, and further improves the stability and reliability of the receiver.

[0008] As an improvement to the first aspect of the technical solution, in step S2: the receiver's local oscillator generates a first reference signal and performs difference frequency processing with the first processed signal; in step S3: the receiver's local oscillator generates a second reference signal with the same frequency as the first reference signal and performs sum frequency processing with the second processed signal, thereby ensuring the stability and reliability of the system.

[0009] As an improvement to the first technical solution, the receiver's local oscillator works in conjunction with the power divider to generate a first reference signal and a second reference signal, ensuring precise frequency matching and improving the accuracy and stability of signal processing.

[0010] As an improvement to the first aspect of the technical solution, in step S1: the radio frequency signal undergoes a first filtering process to obtain a first processed signal; in step S2: the first processed signal and the first reference signal undergo a difference frequency processing followed by a second filtering process to obtain a second processed signal; in step S3: the second processed signal and the second reference signal undergo a sum frequency processing followed by a third filtering process to obtain a third processed signal. Through the above three filtering processes, the receiver can effectively suppress interference signals, improve signal purity and stability, thereby significantly improving the performance and reliability of the receiver. This multi-stage filtering design not only improves signal quality but also enhances the receiver's anti-interference capability in complex electromagnetic environments, ensuring the stable operation of the wireless microphone system.

[0011] As an improvement to the first aspect of the technical solution, the frequencies of the first and third processed signals are 640-690MHz, thereby improving the application range and flexibility of the wireless microphone.

[0012] As an improvement to the first technical solution, the frequency of the second processed signal is 110MHz, which not only improves the signal quality and stability, but also enhances the overall performance of the receiver, making it more suitable for high-quality audio transmission applications.

[0013] As an improvement to the first aspect of the technical solution, the frequencies of the first reference signal and the second reference signal are 530-580MHz, which can reduce the frequency of the first processing signal to the frequency of the second processing signal of 110MHz, and restore the frequency of the second processing signal to the same frequency as the first processing signal in subsequent steps.

[0014] As an improvement to the first aspect of the technical solution, the receiver is wirelessly connected to the wireless microphone. The frequency of the radio frequency signal emitted by the wireless microphone is 110MHz higher than the frequency of the first reference signal, which can quickly and accurately achieve frequency matching between the transmitter and receiver.

[0015] Secondly, this application provides a signal processing system for a wireless microphone receiver, employing a signal processing method for a wireless microphone receiver as described in the first aspect of the technical solution, comprising: The receiving port is used to receive radio frequency signals emitted by the wireless microphone; The first filter is used to process the radio frequency signal to obtain the first processed signal; The local oscillator and power divider are used to generate a first reference signal and a second reference signal with the same frequency. A first mixer is used to perform differential frequency processing between the first processed signal and the first reference signal; The second filter is used to process the signal output from the first mixer to obtain a second processed signal. A second mixer is used to perform frequency processing on the second processed signal and the second reference signal; The third filter is used to process the signal output from the second mixer to obtain the third processed signal. And an output port for outputting the third processing signal.

[0016] The signal processing system for a wireless microphone receiver according to the second aspect of this application provides physical support for the signal processing method for a wireless microphone receiver according to the first aspect, so as to implement the signal processing method for a wireless microphone receiver according to the first aspect.

[0017] Thirdly, this application provides a signal processing chip for a wireless microphone receiver, including at least one of a programmable logic circuit and executable instructions. The chip operates in a receiver to implement the signal processing method for a wireless microphone receiver according to the first aspect of the technical solution. Through the operation of the signal processing chip for a wireless microphone receiver provided by this application, a series of operations such as receiving, processing, and outputting wireless microphone radio frequency signals can be completed, thereby improving the stability and reliability of the wireless microphone receiver. Attached Figure Description

[0018] Figure 1 This is a flowchart of a signal processing method for a wireless microphone receiver according to an embodiment of this application; Figure 2 This is a schematic diagram of a signal processing system for a wireless microphone receiver according to an embodiment of this application.

[0019] In the diagram: 1. Receive port; 2. First filter; 3. Local oscillator; 4. Power divider; 5. First mixer; 6. Second filter; 7. Second mixer; 8. Third filter; 9. Output port. Detailed implementation method. The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] It should be noted that the KT chip is an integrated circuit chip, typically used for processing the reception and demodulation of wireless signals. In this application, the KT chip is used in a wireless microphone receiver, capable of directly reading the high-frequency radio frequency signal of the wireless microphone according to a set frequency band, providing a basis for the subsequent output of the radio frequency signal to a power amplifier or speaker.

[0021] Firstly, such as Figure 1 As shown in the embodiment of this application, a signal processing method for a wireless microphone receiver includes the following steps: S1, the receiver receives the radio frequency signal emitted by the wireless microphone from the receiving port and obtains the first processed signal.

[0022] In step S1, the receiver can receive the radio frequency signal emitted by the wireless microphone through the antenna connected to the receiving port. The radio frequency signal received by the antenna can be amplified by a low-noise amplifier to improve the signal-to-noise ratio while minimizing the introduction of noise, and a first processed signal is obtained. At this time, the frequency of the first processed signal is the same as the frequency of the radio frequency signal emitted by the wireless microphone.

[0023] S2, the receiver performs differential frequency processing on the first processed signal to reduce the frequency of the first processed signal to a set value to obtain the second processed signal.

[0024] In step S2, the receiver may be equipped with a local oscillator, a mixer, or a direct digital frequency synthesis (DDS) technology to achieve difference frequency processing, thereby reducing the frequency of the first processed signal to a set value. This frequency reduction method can not only effectively suppress image frequency interference and improve the selectivity and anti-interference capability of the receiver, but also achieve a higher amplification factor in subsequent processing after the frequency is reduced, and is less prone to self-oscillation. The frequency reduction also facilitates subsequent signal processing, such as filtering and demodulation, further improving the stability and reliability of the receiver.

[0025] S3, the receiver performs sum-frequency processing on the second processed signal to restore the frequency of the second processed signal to the same as that of the first processed signal in order to obtain the third processed signal.

[0026] In step S3, similar to step S2, the receiver may incorporate a local oscillator, mixer, direct digital frequency synthesis, or other techniques to perform sum-frequency processing. This restores the frequency of the second processed signal to the same level as the first processed signal to obtain the third processed signal. By increasing and restoring the frequency of the second processed signal to match that of the first processed signal, frequency consistency throughout the processing is ensured, facilitating further processing and analysis by subsequent circuits while maintaining the original signal characteristics. Furthermore, sum-frequency processing increases the transmission bandwidth, supports higher data transmission rates, and reduces interference from adjacent frequency points during transmission, further enhancing the receiver's stability and reliability.

[0027] S4, the receiver outputs the third processed signal from the transmission port.

[0028] In step S4, the output port of the receiver can be connected to an external power amplifier or speaker through the KT chip to prepare for further processing, amplification and output of the third processed signal. Thus, the wireless microphone receiver of this application completes the reception, processing and output of the radio frequency signal of the wireless microphone using the signal processing method.

[0029] The signal processing method for a wireless microphone receiver disclosed in this application can receive, process, and output radio frequency signals emitted by a wireless microphone. The frequency of the output third processed signal is the same as the frequency of the radio frequency signal emitted by the wireless microphone. By first down-converting and then up-converting the frequency, image frequency interference can be effectively suppressed, improving the selectivity and anti-interference capability of the receiver, reducing interference from adjacent frequency points received during signal transmission, and ensuring the frequency consistency of the signal throughout the entire processing process. This facilitates further processing and analysis of the signal by subsequent circuits, maintains the original characteristics of the signal, and further improves the stability and reliability of the receiver.

[0030] As a further improvement to the first aspect of the technical solution, in step S2: the receiver's local oscillator generates a first reference signal and performs frequency difference processing with the first processed signal. This process is based on the mixing principle, that is, multiplying two signals of different frequencies to generate a new frequency component. Specifically, after the first processed signal is multiplied with the first reference signal, a signal with a frequency equal to the frequency difference between the two is generated, thereby achieving frequency reduction. This effectively suppresses image frequency interference, because the image frequency is usually located symmetrically to the received signal frequency. Through frequency difference processing, it can be moved out of the receiving frequency band, improving the receiver's selectivity and anti-interference capability. Secondly, the reduced signal frequency after frequency difference processing facilitates subsequent intermediate frequency selective amplification, making the frequency selection characteristics better than the single-conversion method, further improving the signal quality. In addition, the signal with reduced frequency can achieve a higher amplification factor in subsequent processing and is less prone to self-oscillation, thereby ensuring the stability and reliability of the system.

[0031] As a further improvement to the first aspect of the technical solution, in step S3: the receiver's local oscillator generates a second reference signal with the same frequency as the first reference signal and performs frequency-switching with the second processed signal. This process is also based on the mixing principle. Specifically, after multiplying the second processed signal with the second reference signal, a signal with a frequency equal to the sum of their frequencies is generated, thereby achieving frequency boosting. This enables the signal frequency to be restored to the same frequency as the first processed signal, ensuring frequency consistency throughout the processing process, facilitating further processing and analysis of the signal by subsequent circuits, and maintaining the original characteristics of the signal. Secondly, this frequency restoration process helps improve system compatibility, avoiding signal distortion or errors caused by frequency mismatch, and ensuring compatibility between the receiver and transmitter. Furthermore, through frequency-switching, the receiver can flexibly adjust the signal frequency, increase transmission bandwidth, support higher data transmission rates, reduce signal interference during transmission, improve signal transmission quality, and further enhance the stability and reliability of the receiver.

[0032] In a preferred embodiment of the first aspect of the technical solution, the receiver's local oscillator, in conjunction with a power divider, generates a first reference signal and a second reference signal. The local oscillator generates a single-frequency oscillation signal, which is split into two paths by the power divider, serving as the first reference signal and the second reference signal, respectively. Due to the power divider, these two signals have the same frequency but can be used independently for different processing procedures. Specifically, the first reference signal is used for difference frequency processing with the first processed signal, reducing the frequency of the first processed signal to the frequency of the second processed signal; while the second reference signal is used for sum frequency processing with the second processed signal, restoring the frequency of the second processed signal to the same frequency as the first processed signal, thereby obtaining the third processed signal. The combination of a local oscillator and a power divider simplifies the receiver's hardware structure, reduces the number of required oscillators, and lowers cost and complexity. Simultaneously, since the first and second reference signals share the same frequency source, precise frequency matching is ensured, improving the accuracy and stability of signal processing.

[0033] In a preferred embodiment of this application, filtering of multiple signals is also performed, as detailed below.

[0034] In step S1: The radio frequency signal preferably undergoes a first filtering process to obtain a first processed signal. The first filtering process allows signals within a specific frequency range to pass through while blocking signals of other frequencies, in order to remove unwanted frequency components and interference signals, thereby obtaining a relatively pure first processed signal.

[0035] In step S2: After the first processed signal and the first reference signal undergo frequency difference processing, a second filtering process is preferably performed to obtain the second processed signal. The second filtering process further optimizes the frequency characteristics of the signal, removes spurious frequency components that may be generated during the frequency difference process, and ensures the purity and stability of the signal. This filtering process helps improve the selectivity of the receiver, enabling it to receive the target signal more accurately, while reducing the influence of interference signals.

[0036] In step S3: After the second processed signal and the second reference signal are summed and frequency processed, the third processed signal is preferably obtained by a third filtering process. The purpose of the third filtering process is to remove unwanted frequency components that may be generated during the summing and frequency processing, so as to ensure that the frequency characteristics of the final output signal meet the requirements.

[0037] Through the three-stage filtering process described above, the receiver can effectively suppress interference signals, improve signal purity and stability, and thus significantly enhance the receiver's performance and reliability. This multi-stage filtering design not only improves signal quality but also enhances the receiver's anti-interference capability in complex electromagnetic environments, ensuring the stable operation of the wireless microphone system.

[0038] Specifically, the frequencies of the first and third processing signals are preferably 640-690MHz. Since the frequency of the first processing signal is the same as the frequency of the radio frequency signal emitted by the wireless microphone, this frequency band belongs to the Ultra High Frequency (UHF) band, one of the widely used communication bands in wireless microphone systems. The propagation characteristics of the UHF band include line-of-sight propagation and moderate penetration capability, making it perform well in wireless microphone applications. The principle of choosing the 640-690MHz band is that this band can provide sufficient bandwidth to support high-quality audio signal transmission while avoiding interference with other common wireless communication bands. Furthermore, the signal in this band maintains good propagation performance in both indoor and outdoor environments, ensuring the stability and reliability of the wireless microphone in various usage scenarios. In addition, it can achieve high spectral efficiency, supporting the simultaneous use of multiple wireless microphones without interference; at the same time, the signal in this band has strong penetration capability through buildings and other obstacles, reducing the impact of signal obstruction, thereby improving the usability and flexibility of the wireless microphone.

[0039] Specifically, the preferred frequency of the second processed signal is 110MHz. Compared to the traditional 10.7MHz and 455kHz intermediate frequencies, the 110MHz band offers a wider bandwidth, supporting higher-quality audio signal transmission. Furthermore, the 110MHz band has stronger anti-interference capabilities, enabling the receiver to receive signals more stably in complex electromagnetic environments. This higher intermediate frequency helps reduce image interference, as the distance between the image frequency and the desired signal frequency is twice that of the intermediate frequency. A higher intermediate frequency keeps the image frequency away from the receiving band, thus reducing the likelihood of image interference. Simultaneously, the 110MHz intermediate frequency allows for better integration with high-performance filters and amplifiers in the receiver, achieving more efficient signal processing and amplification, further enhancing receiver performance. Therefore, selecting 110MHz as the frequency of the second processed signal not only improves signal quality and stability but also enhances the overall performance of the receiver, making it more suitable for high-quality audio transmission applications.

[0040] Specifically, the frequencies of the first reference signal and the second reference signal are preferably 530-580MHz. This frequency band is chosen to ensure that during the difference frequency and sum frequency processing, the frequency of the first processed signal can be reduced to the frequency of the second processed signal (110MHz), and that in subsequent steps, the frequency of the second processed signal can be restored to the same frequency as the first processed signal.

[0041] More specifically, the receiver is preferably wirelessly connected to the wireless microphone, and the frequency of the radio frequency signal emitted by the wireless microphone is 110MHz higher than the frequency of the first reference signal. In practice, the receiver can wirelessly connect to the wireless microphone via Bluetooth, WiFi, or mobile phone signals to achieve frequency matching (the wireless microphone and receiver can communicate through an integrated microcontroller or control chip to achieve automatic frequency matching). For example, if the wireless microphone's transmission frequency is 650MHz, the receiver's receiving channel will be adjusted to 650MHz. This ensures that the radio frequency signal emitted by the wireless microphone can be accurately received and processed. The principle of this frequency matching method is to establish a control channel between the transmitter and receiver using wireless communication technology. Through this channel, the transmitter can send its own transmission frequency information to the receiver. The receiver automatically adjusts its receiving frequency based on the received information, enabling fast and accurate frequency matching between the transmitter and receiver. This improves the system's automation level and user experience, and enhances the system's anti-interference capability, as automatic frequency matching avoids signal loss or interference caused by frequency mismatch.

[0042] Secondly, such as Figure 2As shown, an embodiment of the present application discloses a signal processing system for a wireless microphone receiver, which adopts a signal processing method for a wireless microphone receiver in the first aspect of the technical solution. The system includes a receiving port 1, a first filter 2, a local oscillator 3, a power divider 4, a first mixer 5, a second filter 6, a second mixer 7, a third filter 8, and an output port 9.

[0043] The receiving port 1 is used to receive radio frequency signals emitted by the wireless microphone. In fact, the receiving port 1 is located on the receiver and is equipped with a receiving antenna to receive radio frequency signals emitted by the wireless microphone.

[0044] The first filter 2 is used to process the radio frequency signal to obtain the first processed signal, thereby achieving the first filtering process.

[0045] The local oscillator 3 and the power divider 4 are used to generate a first reference signal and a second reference signal with the same frequency, which are used for difference frequency processing with the first processed signal and sum frequency processing with the second processed signal, respectively.

[0046] The first mixer 5 is used to perform frequency difference processing on the first processed signal and the first reference signal. The second filter 6 is used to process the signal output from the first mixer 5 to obtain the second processed signal. The first processed signal is then subjected to frequency difference and a second filter to obtain the second processed signal.

[0047] The second mixer 7 is used to perform frequency mixing and frequency processing on the second processed signal and the second reference signal. The third filter 8 is used to process the signal output from the second mixer 7 to obtain the third processed signal, and to perform a third filtering on the second processed signal to obtain the third processed signal.

[0048] The output port 9 is used to output the third processed signal. In fact, the output port 9 is located on the receiver and can be connected to an external power amplifier or audio system through a KT chip to prepare for further processing, amplification and output of the third processed signal.

[0049] The modules in the aforementioned signal processing system for the wireless microphone receiver can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in hardware within or independently of the application processor in a computer device, or stored in software within the computer device's memory, allowing the application processor to call and execute the corresponding operations of each module.

[0050] The signal processing system for a wireless microphone receiver according to the second aspect of this application provides physical support for the signal processing method for a wireless microphone receiver according to the first aspect, so as to implement the signal processing method for a wireless microphone receiver according to the first aspect.

[0051] Thirdly, an embodiment of this application provides a signal processing chip for a wireless microphone receiver, comprising at least one of a programmable logic circuit and executable instructions. The chip operates in the receiver to implement the signal processing method for a wireless microphone receiver according to the first aspect of the technical solution. Through the operation of the signal processing chip for a wireless microphone receiver according to this application, a series of operations such as receiving, processing, and outputting wireless microphone radio frequency signals can be completed, thereby improving the stability and reliability of the wireless microphone receiver.

[0052] The above are merely specific embodiments of this application, providing a detailed description of the application. The related descriptions are only for helping to understand the core ideas of this application and are not intended to limit the patent scope of this application. At the same time, for those skilled in the art, equivalent structural or procedural transformations made based on the ideas of this application and utilizing the content of the specification and drawings of this application, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A signal processing method for a wireless microphone receiver, characterized in that, Includes the following steps: S1, the receiver receives the radio frequency signal emitted by the wireless microphone from the receiving port and obtains the first processing signal; S2, the receiver performs difference frequency processing on the first processed signal to reduce the frequency of the first processed signal to a set value to obtain the second processed signal; S3, the receiver performs sum-frequency processing on the second processed signal to restore the frequency of the second processed signal to the same as that of the first processed signal in order to obtain the third processed signal; S4, the receiver outputs the third processed signal from the transmission port.

2. The signal processing method for a wireless microphone receiver as described in claim 1, characterized in that, In step S2: The receiver's local oscillator generates a first reference signal and performs frequency difference processing with the first processed signal; In step S3: The receiver's local oscillator generates a second reference signal with the same frequency as the first reference signal and performs frequency processing with the second processed signal.

3. The signal processing method for a wireless microphone receiver as described in claim 2, characterized in that, The receiver's local oscillator works in conjunction with the power divider to generate a first reference signal and a second reference signal.

4. The signal processing method for a wireless microphone receiver as described in claim 3, characterized in that, In step S1: the radio frequency signal undergoes a first filtering process to obtain a first processed signal; In step S2: the first processed signal and the first reference signal undergo frequency difference processing and then a second filtering process to obtain the second processed signal; In step S3: the second processed signal and the second reference signal are subjected to frequency processing and then undergo a third filtering process to obtain the third processed signal.

5. The signal processing method for a wireless microphone receiver as described in claim 4, characterized in that, The frequencies of the first and third processing signals are 640-690MHz.

6. The signal processing method for a wireless microphone receiver as described in claim 5, characterized in that, The frequency of the second processed signal is 110MHz.

7. The signal processing method for a wireless microphone receiver as described in claim 6, characterized in that, The frequencies of the first reference signal and the second reference signal are 530-580MHz.

8. The signal processing method for a wireless microphone receiver as described in claim 7, characterized in that, The receiver is wirelessly connected to the wireless microphone, and the frequency of the radio frequency signal emitted by the wireless microphone is 110MHz higher than the frequency of the first reference signal.

9. A signal processing system for a wireless microphone receiver, employing the signal processing method for a wireless microphone receiver as described in claim 4, characterized in that, include: The receiving port is used to receive radio frequency signals emitted by the wireless microphone; The first filter is used to process the radio frequency signal to obtain the first processed signal; The local oscillator and power divider are used to generate a first reference signal and a second reference signal with the same frequency. A first mixer is used to perform differential frequency processing between the first processed signal and the first reference signal; The second filter is used to process the signal output from the first mixer to obtain a second processed signal. A second mixer is used to perform frequency processing on the second processed signal and the second reference signal; The third filter is used to process the signal output from the second mixer to obtain the third processed signal. And an output port for outputting the third processing signal.

10. A signal processing chip for a wireless microphone receiver, characterized in that, The chip includes at least one of programmable logic circuitry and executable instructions, and operates in a receiver to implement a signal processing method for a wireless microphone receiver according to any one of claims 1-8.

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