Low-frequency switching method and system of moving-coil pickup

Abstract

The invention relates to the technical field of sound pick-up regulation and control, in particular to a low-frequency switching method and system for a moving-coil sound pick-up, and the method comprises the steps: receiving sound wave signals through a target sound pick-up, obtaining an original sound wave signal set, cutting the original sound wave signal set, obtaining a cut sound wave signal set, carrying out the signal analysis of the cut sound wave signal set, and obtaining a sound wave signal set; cutting signal energy and cutting signal frequency are obtained, a cutting signal frequency group and a cutting signal energy group are utilized to carry out environment sound wave interference analysis to obtain a sound wave interference factor, and if the sound wave interference factor is larger than a standard interference factor, a low-frequency filtering device is utilized to carry out low-frequency switching on a target sound pickup to obtain a switched sound pickup. According to the invention, the quality of the sound wave signal received by the moving-coil pickup can be improved, and the environmental adaptability of the moving-coil pickup is enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of pickup control, and in particular to a low-frequency switching method and system for a moving coil pickup. Background Art

[0002] Dynamic microphone is a widely used device in the field of audio acquisition. Due to its simple structure, low cost and stable performance, it plays a key role in many scenarios such as music recording, live sound reinforcement, broadcasting systems, etc. It is an important tool for audio signal acquisition.

[0003] The current dynamic microphone pickup is mainly composed of a mechanical diaphragm, an enameled coil and a permanent magnet. This dynamic microphone pickup does not have an integrated low-frequency sound wave filtering device. Therefore, when the working environment is relatively noisy, the quality of the received sound wave signal is low, and the low-frequency sound waves in the environment cannot be filtered in time, making the environmental adaptability of this dynamic microphone pickup poor. Summary of the invention

[0004] The invention provides a low-frequency switching method and system for a dynamic coil pickup, the main purpose of which is to improve the quality of the sound wave signal received by the dynamic coil pickup and enhance the environmental adaptability of the dynamic coil pickup.

[0005] To achieve the above object, the present invention provides a low-frequency switching method for a moving coil pickup, comprising: receiving a low-frequency switching instruction, and determining a target pickup based on the low-frequency switching instruction, wherein the target pickup includes a low-frequency filtering device; According to a preset sound wave analysis time, a target microphone is used to receive sound wave signals to obtain an original sound wave signal set, wherein the original sound wave signals in the original sound wave signal set are arranged from earliest to latest according to the time sequence of acquisition, and the target microphone is a dynamic microphone; Based on a preset signal cutting number, the original sound wave signal set is cut to obtain a cut sound wave signal group set, wherein the number of cut sound wave signal groups in the cut sound wave signal group set is the same as the signal cutting number; Extracting cutting sound wave signal groups in sequence from the cutting sound wave signal group set, performing signal analysis on the cutting sound wave signal groups, and obtaining cutting signal energy and cutting signal frequency; Summarizing the cutting signal frequency and the cutting signal energy of each cutting sound wave signal group to obtain a cutting signal frequency group and a cutting signal energy group; Using the cutting signal frequency group and the cutting signal energy group, the environmental sound wave interference analysis is performed to obtain the sound wave interference factor; If it is confirmed that the sound wave interference factor is greater than the preset standard interference factor, the low-frequency filtering device is used to perform low-frequency switching on the target pickup to obtain a switched pickup, wherein the low-frequency filtering device includes: a cylindrical cavity, a perforated disc, a connecting chassis and a tuning paper; The low frequency switching of the dynamic pickup is completed based on the switching pickup.

[0006] Optionally, performing signal analysis on the cutting sound wave signal group to obtain cutting signal energy and cutting signal frequency includes: Identify the signal amplitude of each cutting sound wave signal in the cutting sound wave signal group to obtain a signal amplitude group, wherein the signal amplitude is a current value; Based on the signal amplitude group, the cutting signal energy is calculated using the following formula: in, represents the cutting signal energy, represents the number of signal amplitudes in the signal amplitude group, represents the cth signal amplitude in the signal amplitude group; Performing frequency identification on the cutting sound wave signal group to obtain a signal frequency group, wherein the number of signal frequencies in the signal frequency group is the same as the number of cutting sound wave signals in the cutting sound wave signal group; Based on the signal frequency group, a cutting signal frequency is calculated.

[0007] Optionally, the identifying the cutting signal frequency based on the signal frequency group includes: Based on the signal frequency groups, identifying a center signal frequency group; Using the central signal frequency group, frequency classification is performed on the signal frequency group to obtain an average classification frequency group and a classification frequency array, wherein a central signal frequency in the central signal frequency group corresponds to an average classification frequency in the average classification frequency group and a classification frequency number in the classification frequency array; Based on the average classification frequency group and the classification frequency array, the cutting signal frequency is calculated using the following formula: in, Indicates the cutting signal frequency, Represents the number of average category frequencies in the average category frequency group or the number of category frequencies in the category frequency array. Indicates the first The frequency of the categories, Represents the average classification frequency in the group The average classification frequency, Indicates the first The frequency of the categories.

[0008] Optionally, the identifying a center signal frequency group based on the signal frequency group includes: The signal frequencies to be identified are sequentially extracted from the signal frequency group, and the deviation values ​​to be identified of the signal frequencies to be identified are calculated, wherein the deviation values ​​to be identified are expressed as: in, represents the deviation value to be identified, Indicates the frequency of the signal to be identified, Indicates the first frequency in the signal frequency group The signal frequency, Indicates the number of signal frequencies in the signal frequency group; Summarizing the deviation values ​​to be identified to obtain a deviation value group to be identified, and identifying a center deviation value group in the deviation value group to be identified based on a preset number of classification centers, wherein the number of center deviation values ​​in the center deviation value group is the same as the number of classification centers; A central signal frequency group corresponding to the central deviation value group is identified in the signal frequency group.

[0009] Optionally, the use of the central signal frequency group to perform frequency classification on the signal frequency group to obtain an average classification frequency group and a classification frequency array includes: extracting the center signal frequencies in the center signal frequency group in sequence; Calculating the center frequency difference between each signal frequency in the signal frequency group and the center signal frequency to obtain a center frequency difference group; Using a preset minimum frequency difference, the center frequency difference group is screened to obtain a frequency difference group to be classified, and a signal frequency group to be classified corresponding to the frequency difference group to be classified is identified in the signal frequency group, and the center signal frequency is aggregated with the signal frequency group to be classified to obtain a classified signal frequency group; Calculating the average classification frequency in the classification signal frequency group, and counting the number of classification frequencies in the classification signal frequency group; The average classification frequency and the number of classification frequencies corresponding to each central signal frequency are summarized respectively to obtain the average classification frequency group and the classification frequency array.

[0010] Optionally, the use of the cutting signal frequency group and the cutting signal energy group to perform environmental sound wave interference analysis to obtain the sound wave interference factor includes: respectively calculating the total cutting signal frequency of the cutting signal frequency group and the total cutting signal energy of the cutting signal energy group; A frequency feature vector is constructed according to the total cutting signal frequency and the cutting signal frequency group, and an energy feature vector is constructed based on the total cutting signal energy and the cutting signal energy group, wherein the frequency feature vector and the energy feature vector are respectively expressed as: in, represents the frequency eigenvector, represents the first vector parameter in the frequency eigenvector, represents the first frequency feature vector vector parameters, represents the first frequency feature vector frequency eigenvectors, Indicates the first frequency in the cutting signal frequency group. Cutting signal frequency, Indicates the total cutting signal frequency, represents the energy eigenvector, represents the first vector parameter in the energy eigenvector, represents the energy eigenvector vector parameters, represents the energy eigenvector energy eigenvectors, Indicates the number of cutting signal energy groups The cutting signal energy, represents the total cutting signal energy; Based on the frequency eigenvector and the energy eigenvector, the environmental interference is evaluated to obtain the environmental interference factor.

[0011] Optionally, the environmental interference assessment is performed based on the frequency eigenvector and the energy eigenvector to obtain the environmental interference factor, including: Determine the working environment of the target pickup, analyze the sound wave signal of the working environment, and obtain the environmental frequency vector and environmental energy vector; The environmental interference factor is calculated according to the frequency characteristic vector, the energy characteristic vector, the environmental frequency vector and the environmental energy vector, wherein the environmental interference factor is expressed as: in, represents the environmental interference factor, Represents the vector dot product symbol, represents the ambient frequency vector, represents the ambient energy vector, Represents the magnitude symbol of a vector.

[0012] Optionally, before the low-frequency switching of the target pickup by using the low-frequency filtering device to obtain the switched pickup, the method further comprises: Acquire a cylindrical cavity and confirm the bottom area of ​​the cylindrical cavity, wherein the cylindrical cavity includes: an open bottom surface and a closed bottom surface; Calculating a first opening area according to the bottom area and a preset small hole area ratio, wherein the first opening area is the product of the bottom area and the small hole area ratio; Determine a second opening area and a third opening area based on the bottom area, wherein the second opening area and the third opening area are both the same as the bottom area; According to the first opening area, the second opening area and the third opening area, a hole cutting is performed on a pre-constructed metal disc to obtain a holed disc, wherein the holed disc comprises: a first disc opening, a second disc opening and a third disc opening, the area of ​​the first disc opening, the area of ​​the second disc opening and the area of ​​the third disc opening are respectively: a first opening area, a second opening area and a third opening area, and a metal handle is provided at the edge of the holed disc; According to the perforated circular disc, a connecting chassis is obtained, wherein the area and shape of the connecting chassis are the same as those of the perforated circular disc, and the connecting chassis includes: a first chassis opening and a second chassis opening, and the areas of the first chassis opening and the second chassis opening are respectively the first opening area and the second opening area, and the positions of the first chassis opening and the second chassis opening in the connecting chassis are respectively the same as the positions of the first disc opening and the second disc opening in the perforated circular disc; The third disk opening in the perforated disk is covered with tuning paper to obtain a third tuning opening, and the cylindrical cavity, the perforated disk and the connecting chassis are connected to obtain a low-frequency filtering device, wherein the open bottom surface of the cylindrical cavity is connected to the bottom surface of the connecting chassis, and the other bottom surface of the connecting chassis is connected to the perforated disk.

[0013] Optionally, the low-frequency filtering device is used to perform low-frequency switching on the target pickup to obtain a switched pickup, including: Confirming the sound wave working state of the target pickup, wherein the sound wave working state includes: a normal working state and a low-frequency filtering state, in which the third tuning opening coincides with the second chassis opening in the normal working state, and in which the first disc opening and the second disc opening coincide with the first chassis opening and the second chassis opening respectively in the low-frequency filtering state, and the coincidence means that the two openings are in contact with each other and the central axes are aligned; If the target pickup is in a normal working state, the metal handle of the perforated disc is used to rotate the perforated disc until the first disc opening and the second disc opening in the perforated disc are respectively coincident with the first chassis opening and the second chassis opening in the connecting chassis, and the target pickup at this time is recorded as the switching pickup; If the target pickup is in the low frequency filtering state, the target pickup is recorded as a switching pickup.

[0014] To achieve the above object, the present invention further provides a low-frequency switching system for a moving coil pickup, comprising: An original sound wave acquisition module is used to receive a low-frequency switching instruction, determine a target pickup based on the low-frequency switching instruction, wherein the target pickup includes a low-frequency filtering device, and receive sound wave signals using the target pickup according to a preset sound wave analysis duration to obtain an original sound wave signal set, wherein the original sound wave signals in the original sound wave signal set are arranged from first to last according to the time sequence of acquisition, and the target pickup is a dynamic coil pickup; The acoustic signal cutting module is used to cut the original acoustic signal set based on a preset signal cutting number to obtain a cutting acoustic signal group set, wherein the number of cutting acoustic signal groups in the cutting acoustic signal group set is the same as the signal cutting number, and the cutting acoustic signal groups are sequentially extracted from the cutting acoustic signal group set, and the cutting acoustic signal groups are subjected to signal analysis to obtain the cutting signal energy and the cutting signal frequency; An interference factor calculation module is used to respectively summarize the cutting signal frequency and cutting signal energy of each cutting acoustic wave signal group to obtain a cutting signal frequency group and a cutting signal energy group, and use the cutting signal frequency group and the cutting signal energy group to perform environmental acoustic wave interference analysis to obtain an acoustic wave interference factor; The low-frequency sound wave filtering module is used to use the low-frequency filtering device to perform low-frequency switching on the target pickup to obtain a switched pickup if it is confirmed that the sound wave interference factor is greater than a preset standard interference factor, wherein the low-frequency filtering device includes: a cylindrical cavity, a perforated disc, a connecting chassis and tuning paper.

[0015] In order to solve the above problem, the present invention further provides an electronic device, the electronic device comprising: A memory storing at least one instruction; The processor executes the instructions stored in the memory to implement the low-frequency switching method of the moving coil pickup described above.

[0016] In order to solve the above problem, the present invention further provides a computer-readable storage medium, wherein at least one instruction is stored in the computer-readable storage medium, and the at least one instruction is executed by a processor in an electronic device to implement the low-frequency switching method of the moving coil pickup described above.

[0017] In order to solve the problems described in the background technology, the present invention firstly obtains an original sound wave signal set according to the sound wave analysis time and the target microphone for receiving the sound wave signal. This step obtains comprehensive and continuous original sound wave data, which provides sufficient and complete basic data for subsequent in-depth analysis of the sound wave signal. Then, based on the signal cutting number, the original sound wave signal set is cut to obtain a cut sound wave signal group set, and the original sound wave signal set is cut into multiple cut sound wave signal groups, each cut sound wave signal group contains the sound wave information within a specific time period, and the sound waves within these time periods are respectively analyzed in depth, so that the changes of the sound waves in different time periods can be observed more clearly, thereby improving the accuracy of subsequent sound wave feature extraction, and then the cut sound wave signal groups are subjected to signal analysis to obtain the cutting signal energy and the cutting signal frequency. Through the signal analysis, the signal energy and the signal frequency of each cutting sound wave signal group can be obtained, which provides a key parameter basis for the subsequent interference analysis of the sound wave signal. Furthermore, the cutting signal The frequency group and the cutting signal energy group are used to analyze the environmental sound wave interference and obtain the sound wave interference factor. This step comprehensively considers the frequency and energy characteristics of the sound wave signal to more comprehensively and accurately evaluate the degree of environmental interference to the sound wave signal. By obtaining the quantitative indicator of the sound wave interference factor, a clear and objective basis is provided for judging whether the sound wave signal is seriously interfered with and whether low-frequency switching and other operations are required in the future. If the sound wave interference factor is greater than the standard interference factor, the low-frequency filtering device is used to perform low-frequency switching on the target pickup to obtain a switching pickup. By switching the pickup, the working state of the target pickup is optimized and adjusted, so that it can receive and process sound wave signals within a more ideal frequency range, improve the sound wave signal reception quality and accuracy of the target pickup, and enhance the working performance of the pickup in an interference environment. At the same time, the construction of the low-frequency filtering device also makes up for the defect that the dynamic coil pickup cannot filter low-frequency sound waves in real time, and further enhances the environmental adaptability of the dynamic coil pickup. Therefore, the present invention can improve the quality of the sound wave signal received by the dynamic coil microphone and enhance the environmental adaptability of the dynamic coil microphone. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic flow chart of a low-frequency switching method for a moving coil pickup provided in one embodiment of the present invention; Figure 2 A functional module diagram of a low-frequency switching system for a moving coil pickup provided by an embodiment of the present invention; Figure 3 A schematic structural diagram of an electronic device for implementing the low-frequency switching method of the moving coil pickup provided by an embodiment of the present invention.

[0019] Description of reference numerals: 1. Electronic device; 10. Processor; 11. Memory; 12. Bus.

[0020] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0021] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0022] The embodiment of the present application provides a low-frequency switching method for a dynamic microphone. The execution subject of the low-frequency switching method for a dynamic microphone includes but is not limited to at least one of the electronic devices such as a server and a terminal that can be configured to execute the method provided by the embodiment of the present application. In other words, the low-frequency switching method for a dynamic microphone can be executed by software or hardware installed in a terminal device or a server device, and the software can be a blockchain platform. The server includes but is not limited to: a single server, a server cluster, a cloud server or a cloud server cluster, etc.

[0023] Reference Figure 1 FIG. 1 is a flow chart of a low-frequency switching method for a moving coil pickup provided in an embodiment of the present invention. In this embodiment, the low-frequency switching method for a moving coil pickup includes: S1. Receive a low-frequency switching instruction, and determine a target pickup based on the low-frequency switching instruction, wherein the target pickup includes a low-frequency filtering device.

[0024] It is understandable that the low frequency switching instruction refers to an instruction initiated manually to switch the microphone, and the low frequency switching instruction includes information such as the model of the microphone to be switched. The target microphone refers to the microphone determined in the low frequency switching instruction.

[0025] It is clear that the target pickup includes, in addition to the low-frequency filtering device, a mechanical diaphragm, an enameled coil and a permanent magnet. The mechanical diaphragm refers to a component in the target pickup used to capture sound vibrations. It is made of a material with good elasticity, light weight and appropriate rigidity, such as polyester film, polycarbonate, etc. The shape of the mechanical diaphragm is circular, and its size will vary according to the design requirements of the pickup. When the sound wave reaches the pickup, the mechanical diaphragm will vibrate as the pressure of the sound wave changes, and the vibration amplitude and frequency of the mechanical diaphragm correspond to the amplitude and frequency of the received sound wave. This vibration will convert the mechanical energy of the sound wave into the mechanical vibration energy of the diaphragm, thereby achieving preliminary capture of the sound signal. The enameled coil refers to a coil wound by enameled wire, wherein the diameter of the enameled wire is usually 0.05mm to 0.5mm. The enameled coil is usually cylindrical in the target pickup, and the number of turns it is wound will be determined according to the electroacoustic parameter requirements of the target pickup. In the target pickup, the enameled coil is connected to the mechanical diaphragm. When the mechanical diaphragm vibrates, it will drive the enameled coil to move in the magnetic field, thereby generating an induced current signal corresponding to the vibration of the mechanical diaphragm. The size and change law of this induced current signal are related to the vibration amplitude and frequency of the mechanical diaphragm, and then related to the sound signal. The permanent magnet refers to a magnet made of magnetic material that can maintain magnetism for a long time, such as neodymium iron boron, ferrite, etc. The permanent magnet can provide a magnetic field for the target pickup. The magnetic field it generates will surround the enameled coil. For example, a ring-shaped permanent magnet can generate a uniform magnetic field space. When the enameled coil vibrates in this magnetic field space, it can effectively cut the magnetic flux lines, thereby generating an induced current. Moreover, the magnetic field strength of the permanent magnet will affect the size of the induced electromotive force. The stronger the magnetic field, the stronger the induced current signal generated by the enameled coil under the same diaphragm vibration conditions.

[0026] It should be explained that the low-frequency filtering device refers to a device that can physically filter the low-frequency sound waves in the received sound waves. The advantage of this low-frequency filtering device is that it can directly filter the sound waves received by the target microphone without the need to process the sound waves with related computer programs, thereby ensuring the timeliness of the low-frequency filtering. The detailed steps for constructing the low-frequency filtering device will be given later.

[0027] S2. According to a preset sound wave analysis duration, a target microphone is used to receive sound wave signals to obtain an original sound wave signal set, wherein the original sound wave signals in the original sound wave signal set are arranged from earliest to latest in the order of acquisition time, and the target microphone is a dynamic microphone.

[0028] It can be understood that the sound wave analysis duration refers to the artificially set time constant for signal reception, and the original sound wave signal set refers to the set of all original sound wave signals received by the target microphone within the sound wave analysis duration. These original sound wave signals include sound signals such as human voices and environmental noise, and these original sound wave signals are sound wave signals that are not processed in any way and are directly transmitted from the sound source through the air to the target microphone. The sound source can be, for example, human vocal cords, musical instruments, environment, etc., so they contain all the original information of the sound, such as the frequency and amplitude of the sound.

[0029] It should be explained that the dynamic coil pickup refers to a pickup that works based on the principle of electromagnetic induction. Compared with other types of pickups, such as capacitive pickups, the dynamic coil pickup has the advantages of simple structure, low cost, and stable performance. Its frequency response range is wider than other types of pickups and can capture sound signals from low frequency to high frequency. Moreover, since it is based on the principle of electromagnetic induction, it has strong adaptability to the environment and can maintain stable performance under different temperature, humidity and other conditions. This makes the dynamic coil pickup used in various application scenarios, such as microphones, some industrial noise monitoring equipment, etc.

[0030] S3. Based on a preset signal cutting number, the original sound wave signal set is cut to obtain a cut sound wave signal group set, wherein the number of cut sound wave signal groups in the cut sound wave signal group set is the same as the signal cutting number.

[0031] It can be understood that the signal cutting number refers to an artificially set constant, which represents the number of cut sound wave signal groups in the cut sound wave signal group set, and the cut sound wave signal group set refers to a set of multiple original sound wave signal groups obtained after cutting the original sound wave signal set, wherein the detailed steps of cutting are: obtaining the receiving time range of the original sound wave signal set, and evenly cutting the receiving time range into multiple cutting time ranges, wherein the number of cuts is the signal cutting number, and then identifying the cutting sound wave signals in each cutting time range in the multiple cutting time ranges to obtain the cutting sound wave signal group set, wherein each cutting sound wave signal group corresponds to a cutting time range.

[0032] S4. Extract cutting sound wave signal groups in sequence from the cutting sound wave signal group set, perform signal analysis on the cutting sound wave signal groups, and obtain cutting signal energy and cutting signal frequency.

[0033] It should be explained that the cutting signal energy refers to the sum of the energies of all cutting sound wave signals in the cutting sound wave signal group, and the cutting signal frequency refers to the signal frequency that can represent the frequency numerical characteristics of the cutting sound wave signal group. The detailed calculation steps of the cutting signal energy and cutting signal frequency will be given later.

[0034] In detail, the signal analysis of the cutting sound wave signal group to obtain the cutting signal energy and the cutting signal frequency includes: Identify the signal amplitude of each cutting sound wave signal in the cutting sound wave signal group to obtain a signal amplitude group, wherein the signal amplitude is a current value; Based on the signal amplitude group, the cutting signal energy is calculated using the following formula: in, represents the cutting signal energy, represents the number of signal amplitudes in the signal amplitude group, represents the cth signal amplitude in the signal amplitude group; Performing frequency identification on the cutting sound wave signal group to obtain a signal frequency group, wherein the number of signal frequencies in the signal frequency group is the same as the number of cutting sound wave signals in the cutting sound wave signal group; Based on the signal frequency group, a cutting signal frequency is calculated.

[0035] It can be understood that the signal amplitude refers to the current value corresponding to the cutting sound wave signal, the signal frequency group refers to the combination of signal frequencies corresponding to each cutting sound wave signal in the cutting sound wave signal group, and the frequency identification refers to the use of the fast Fourier transform algorithm (FFT) to perform frequency identification on the cutting sound wave signal group, wherein, for a discrete time signal sequence, i.e., the cutting sound wave signal group, FFT can convert it from the time domain to the frequency domain, thereby realizing the frequency identification of the cutting sound wave signal group, and the fast Fourier transform algorithm is a prior art and will not be repeated here.

[0036] In detail, the identifying the cutting signal frequency based on the signal frequency group includes: Based on the signal frequency groups, identifying a center signal frequency group; Using the central signal frequency group, frequency classification is performed on the signal frequency group to obtain an average classification frequency group and a classification frequency array, wherein a central signal frequency in the central signal frequency group corresponds to an average classification frequency in the average classification frequency group and a classification frequency number in the classification frequency array; Based on the average classification frequency group and the classification frequency array, the cutting signal frequency is calculated using the following formula: in, Indicates the cutting signal frequency, Represents the number of average category frequencies in the average category frequency group or the number of category frequencies in the category frequency array. Indicates the first The frequency of the categories, Represents the average classification frequency in the group The average classification frequency, Indicates the first The frequency of the categories.

[0037] It should be explained that the center signal frequency group refers to the combination of signal frequencies in the signal frequency group whose deviation from the average value of all signal frequencies is ranked first y small, where y represents the number of classification centers. The average classification frequency refers to the average frequency of the classified signal frequency group obtained after frequency classification of the signal frequency group, and the classified frequency array refers to the number of classified signal frequencies in the classified signal frequency group obtained after frequency classification, where the detailed steps for obtaining the classified signal frequency group will be given later.

[0038] In detail, the identifying a center signal frequency group based on the signal frequency group includes: The signal frequencies to be identified are sequentially extracted from the signal frequency group, and the deviation values ​​to be identified of the signal frequencies to be identified are calculated, wherein the deviation values ​​to be identified are expressed as: in, represents the deviation value to be identified, Indicates the frequency of the signal to be identified, Indicates the first frequency in the signal frequency group The signal frequency, Indicates the number of signal frequencies in the signal frequency group; Summarizing the deviation values ​​to be identified to obtain a deviation value group to be identified, and identifying a center deviation value group in the deviation value group to be identified based on a preset number of classification centers, wherein the number of center deviation values ​​in the center deviation value group is the same as the number of classification centers; A central signal frequency group corresponding to the central deviation value group is identified in the signal frequency group.

[0039] It can be understood that the signal frequency to be identified refers to the signal frequency extracted from the signal frequency group, and the deviation value to be identified refers to a numerical value used to represent the degree of difference between the signal frequency to be identified and the average frequency of the signal frequency group. Its numerical form is expressed as: the difference between the square of the signal frequency to be identified and the average value of the squares of each signal frequency in the signal frequency group. The greater the difference between the signal frequency to be identified and the average frequency of the signal frequency group, the greater the deviation value to be identified.

[0040] It is clear that the classification center number refers to an artificially set constant, which is used to represent the number of center deviation values ​​in the center deviation value group. The center deviation value group refers to a combination of deviation values ​​to be identified that are the smallest in the deviation value group to be identified, wherein z represents the classification center number. In the step of identifying the center signal frequency group corresponding to the center deviation value group in the signal frequency group, the center signal frequency group is numerically represented as a combination of signal frequencies in the signal frequency group that correspond one-to-one to the center deviation values ​​in the center deviation value group.

[0041] In detail, the central signal frequency group is used to perform frequency classification on the signal frequency group to obtain an average classification frequency group and a classification frequency array, including: extracting the center signal frequencies in the center signal frequency group in sequence; Calculating the center frequency difference between each signal frequency in the signal frequency group and the center signal frequency to obtain a center frequency difference group; Using a preset minimum frequency difference, the center frequency difference group is screened to obtain a frequency difference group to be classified, and a signal frequency group to be classified corresponding to the frequency difference group to be classified is identified in the signal frequency group, and the center signal frequency is aggregated with the signal frequency group to be classified to obtain a classified signal frequency group; Calculating the average classification frequency in the classification signal frequency group, and counting the number of classification frequencies in the classification signal frequency group; The average classification frequency and the number of classification frequencies corresponding to each central signal frequency are summarized respectively to obtain the average classification frequency group and the classification frequency array.

[0042] It should be explained that the center frequency difference refers to the difference between the signal frequency and the center signal frequency. The minimum frequency difference refers to an artificially set constant, which is used to represent the maximum frequency difference in the frequency difference group to be classified. The frequency difference group to be classified refers to the combination of all center frequency differences less than or equal to the minimum frequency difference in the center frequency difference group. The signal frequency group to be classified refers to the combination of signal frequencies in the signal frequency group that correspond one-to-one to the frequency differences to be classified in the frequency difference group to be classified. The classified signal frequency group refers to the combination of the center signal frequency and the signal frequency group to be classified, wherein the aggregation refers to the numerical combination of the center signal frequency and all the signal frequencies to be classified in the signal frequency group to be classified, for example: the center signal frequency is: A, the signal frequency group to be classified is: (B, C, D), then after the center signal frequency and the signal frequency group to be classified are aggregated, the classified signal frequency group is: (A, B, C, D). The average classification frequency refers to the average value of each classification signal frequency in the classification signal frequency group. The number of classification frequencies refers to the number of classification signal frequencies in the classification signal frequency group.

[0043] S5. Summarize the cutting signal frequency and cutting signal energy of each cutting sound wave signal group respectively to obtain a cutting signal frequency group and a cutting signal energy group.

[0044] It is understandable that the cutting signal frequency and the cutting signal energy are both from a single cutting sound wave signal group, so it is necessary to summarize the cutting signal frequency and the cutting signal energy respectively to obtain a cutting signal frequency group and a cutting signal energy group.

[0045] S6. Using the cutting signal frequency group and the cutting signal energy group, perform environmental sound wave interference analysis to obtain a sound wave interference factor.

[0046] It can be understood that the sound wave interference factor refers to a numerical value used to indicate the degree of interference of environmental sound waves on the target microphone receiving the working sound waves, wherein the working sound waves refer to the sound waves that need to be recorded in the current work, for example, when recording in a recording studio, the working sound waves can be: human voices, musical instrument sounds, etc. The greater the degree of interference of environmental sound waves on the target microphone receiving the working sound waves, the greater the sound wave interference factor.

[0047] In detail, the cutting signal frequency group and the cutting signal energy group are used to perform environmental sound wave interference analysis to obtain the sound wave interference factor, including: respectively calculating the total cutting signal frequency of the cutting signal frequency group and the total cutting signal energy of the cutting signal energy group; A frequency feature vector is constructed according to the total cutting signal frequency and the cutting signal frequency group, and an energy feature vector is constructed based on the total cutting signal energy and the cutting signal energy group, wherein the frequency feature vector and the energy feature vector are respectively expressed as: in, represents the frequency eigenvector, represents the first vector parameter in the frequency eigenvector, represents the first frequency feature vector vector parameters, represents the first frequency feature vector frequency eigenvectors, Indicates the first frequency in the cutting signal frequency group. Cutting signal frequency, Indicates the total cutting signal frequency, represents the energy eigenvector, represents the first vector parameter in the energy eigenvector, represents the energy eigenvector vector parameters, represents the energy eigenvector energy eigenvectors, Indicates the number of cutting signal energy groups The cutting signal energy, represents the total cutting signal energy; Based on the frequency eigenvector and the energy eigenvector, the environmental interference is evaluated to obtain the environmental interference factor.

[0048] It should be explained that the total cutting signal frequency refers to the sum of all cutting signal frequencies in the cutting signal frequency group. The total cutting signal energy refers to the sum of all cutting signal energies in the cutting signal energy group. The frequency characteristic vector refers to a vector used to represent the signal frequency characteristics in the original sound wave signal set, wherein each vector parameter in the frequency characteristic vector is numerically expressed as: the ratio between a certain cutting signal frequency in the cutting signal frequency group and the total cutting signal frequency. The energy characteristic vector refers to a signal energy characteristic vector used to represent the original sound wave signal set, wherein each vector parameter in the energy characteristic vector is numerically expressed as: the ratio between a certain cutting signal energy in the cutting signal energy group and the total cutting signal energy.

[0049] In detail, the environmental interference assessment is performed based on the frequency eigenvector and the energy eigenvector to obtain the environmental interference factor, including: Determine the working environment of the target pickup, analyze the sound wave signal of the working environment, and obtain the environmental frequency vector and environmental energy vector; The environmental interference factor is calculated according to the frequency characteristic vector, the energy characteristic vector, the environmental frequency vector and the environmental energy vector, wherein the environmental interference factor is expressed as: in, represents the environmental interference factor, Represents the vector dot product symbol, represents the ambient frequency vector, represents the ambient energy vector, Represents the magnitude symbol of a vector.

[0050] It should be explained that the working environment refers to the current working environment of the target pickup.

[0051] For example, Xiao Zhang is a staff member of a recording studio. One day, Xiao Zhang needs to record a song in the recording studio, and the recording studio can be used as the working environment at this time.

[0052] Furthermore, the environmental frequency vector refers to a vector used to represent the frequency characteristics of the environmental sound waves of the working environment when no work is performed, and the environmental energy vector refers to a vector used to represent the energy characteristics of the environmental sound waves of the working environment when no work is performed. The detailed steps of analyzing the sound wave signals of the working environment are: according to the sound wave analysis duration, the sound wave signals of the working environment are received by the target microphone to obtain an environmental sound wave signal set, and then the environmental sound wave signal set is analyzed to obtain the environmental frequency vector and the environmental energy vector, wherein the steps of analyzing the environmental sound wave signal set to obtain the environmental frequency vector and the environmental energy vector are the same as the steps of obtaining the frequency characteristic vector and the energy characteristic vector through the original sound wave signal set, and will not be repeated here.

[0053] S7. If it is confirmed that the sound wave interference factor is greater than the preset standard interference factor, the low-frequency filtering device is used to perform low-frequency switching on the target pickup to obtain a switched pickup, wherein the low-frequency filtering device includes: a cylindrical cavity, a perforated disc, a connecting chassis and tuning paper.

[0054] It is understandable that the standard interference factor refers to a constant set artificially, which is used to indicate the size of the sound wave interference factor when the current environmental sound wave affects the working sound wave to an uncontrollable degree. The switching pickup refers to the target pickup after low-frequency switching. The cylindrical cavity refers to a metal cylinder with a hollow center, wherein one end of the cylindrical cavity is open and the other end is closed, and there is a long strip opening on the side of the cylindrical cavity, wherein the width and length of the opening are artificially set according to the target pickup of different signals, and a layer of tuning paper is covered inside the cylindrical cavity, and the position of the tuning paper in the cylindrical cavity is manually determined. The perforated disc refers to a metal disc with multiple openings on the surface, and the parameters such as the area and thickness of the perforated disc are determined by the target pickup of different sizes. The size of each opening in the perforated disc will be specifically introduced later. The connecting chassis refers to a metal disc used to connect the cylindrical cavity and the perforated disc, and the area of ​​the connecting chassis is the same as that of the perforated disc. The tuning paper refers to an acoustic environment optimization material with a large number of gaps on its surface. These gaps can absorb sounds within a certain frequency range, thereby reducing sound reflection and echo, and further enhancing the fidelity of sound waves. For example, some specially treated paper sound-absorbing panels have a porous structure inside that can absorb sounds within a certain frequency range. The specific size of the gaps on the surface of the tuning paper is set manually according to the required sound state.

[0055] In detail, before the low-frequency switching of the target pickup is performed by using the low-frequency filtering device to obtain the switched pickup, the method further includes: Acquire a cylindrical cavity and confirm the bottom area of ​​the cylindrical cavity, wherein the cylindrical cavity includes: an open bottom surface and a closed bottom surface; Calculating a first opening area according to the bottom area and a preset small hole area ratio, wherein the first opening area is the product of the bottom area and the small hole area ratio; Determine a second opening area and a third opening area based on the bottom area, wherein the second opening area and the third opening area are both the same as the bottom area; According to the first opening area, the second opening area and the third opening area, a hole cutting is performed on a pre-constructed metal disc to obtain a holed disc, wherein the holed disc comprises: a first disc opening, a second disc opening and a third disc opening, the area of ​​the first disc opening, the area of ​​the second disc opening and the area of ​​the third disc opening are respectively: a first opening area, a second opening area and a third opening area, and a metal handle is provided at the edge of the holed disc; According to the perforated circular disc, a connecting chassis is obtained, wherein the area and shape of the connecting chassis are the same as those of the perforated circular disc, and the connecting chassis includes: a first chassis opening and a second chassis opening, and the areas of the first chassis opening and the second chassis opening are respectively the first opening area and the second opening area, and the positions of the first chassis opening and the second chassis opening in the connecting chassis are respectively the same as the positions of the first disc opening and the second disc opening in the perforated circular disc; The third disk opening in the perforated disk is covered with tuning paper to obtain a third tuning opening, and the cylindrical cavity, the perforated disk and the connecting chassis are connected to obtain a low-frequency filtering device, wherein the open bottom surface of the cylindrical cavity is connected to the bottom surface of the connecting chassis, and the other bottom surface of the connecting chassis is connected to the perforated disk.

[0056] It should be explained that the small hole area ratio refers to a proportional constant set manually. The metal handle refers to a handle directly connected to the side of the perforated disc, and its specific size is set manually, and its size can ensure that it can be rotated by human fingers.

[0057] Furthermore, the open bottom surface refers to the completely open bottom surface of the cylindrical cavity, wherein the completely open bottom surface means that the area of ​​the opening is exactly the same as the bottom area. The closed bottom surface refers to the completely closed bottom surface of the cylindrical cavity, wherein the completely closed bottom surface means that there are no holes in the bottom surface.

[0058] In detail, the low-frequency filtering device is used to perform low-frequency switching on the target pickup to obtain a switched pickup, including: Confirming the sound wave working state of the target pickup, wherein the sound wave working state includes: a normal working state and a low-frequency filtering state, in which the third tuning opening coincides with the second chassis opening in the normal working state, and in which the first disc opening and the second disc opening coincide with the first chassis opening and the second chassis opening respectively in the low-frequency filtering state, and the coincidence means that the two openings are in contact with each other and the central axes are aligned; If the target pickup is in a normal working state, the metal handle of the perforated disc is used to rotate the perforated disc until the first disc opening and the second disc opening in the perforated disc are respectively coincident with the first chassis opening and the second chassis opening in the connecting chassis, and the target pickup at this time is recorded as the switching pickup; If the target pickup is in the low frequency filtering state, the target pickup is recorded as a switching pickup.

[0059] Understandably, the target sound pickup can switch freely between the normal working state and the low-frequency filtering state. For example, when the perforated disk is rotated, the first disk opening, the second disk opening and the third disk opening on the perforated disk rotate together. At a certain time, the target sound pickup is in the bass filtering state, and the first disk opening is opposite to the first chassis opening connected to the chassis, the second disk opening is opposite to the opening of the cylindrical cavity, and the third disk opening will be in a closed state. As the perforated disk rotates, the first disk opening, the second disk opening and the third disk opening will leave their original positions. When the second disk opening moves to the opening opposite to the cylindrical cavity, the perforated disk will reach the maximum rotation angle that can be rotated. At this time, the first disk opening and the second disk opening will not overlap with any opening, that is, they are all in a closed state, so that the target sound pickup reaches a normal working state.

[0060] It should be explained that, under normal working conditions, in order to ensure that the sound waves have sufficient bandwidth and high fidelity, it is necessary to let the tuning paper cover the gap between the cylindrical cavity and the perforated disc, that is, let the third disc opening overlap with the opening of the cylindrical cavity. However, in a noisy environment, the larger the bandwidth of the sound wave signal received by the target pickup, the more noise in the environment will be received by the pickup, which will reduce the quality of the sound wave. Therefore, when the external environmental sound wave interferes with the current working sound wave to a large extent, that is, when the sound wave interference factor is greater than the standard interference factor, in order to ensure the high quality of the received working sound wave, it is necessary to filter out the low-frequency sound waves concentrated in the original sound wave signal. Since the opening of the first disc is smaller in size than the opening of the second disc and the opening of the third disc, the opening of the first disc is ventilated, that is, the target pickup is in a low-frequency filtering state, which can increase the area of ​​the target pickup used for ventilation, increase the airflow in the target pickup, thereby changing the air cavity in the pickup, and achieving the purpose of filtering low-frequency sound waves.

[0061] S8, completing the low frequency switching of the dynamic pickup based on the switching pickup.

[0062] For example, when singing outdoors, in order to reduce the interference of environmental wind and water sounds on the human voice, the low-frequency filtering device can be switched to a low-frequency filtering state. When recording in a recording studio, since the environmental interference is minimal and in order to ensure that the sound received by the target microphone has high fidelity, the low-frequency filtering device needs to be switched to a normal working state.

[0063] In order to solve the problems described in the background technology, the present invention firstly obtains an original sound wave signal set according to the sound wave analysis time and the target microphone for receiving the sound wave signal. This step obtains comprehensive and continuous original sound wave data, which provides sufficient and complete basic data for subsequent in-depth analysis of the sound wave signal. Then, based on the signal cutting number, the original sound wave signal set is cut to obtain a cut sound wave signal group set, and the original sound wave signal set is cut into multiple cut sound wave signal groups, each cut sound wave signal group contains the sound wave information within a specific time period, and the sound waves within these time periods are respectively analyzed in depth, so that the changes of the sound waves in different time periods can be observed more clearly, thereby improving the accuracy of subsequent sound wave feature extraction, and then the cut sound wave signal groups are subjected to signal analysis to obtain the cutting signal energy and the cutting signal frequency. Through the signal analysis, the signal energy and the signal frequency of each cutting sound wave signal group can be obtained, which provides a key parameter basis for the subsequent interference analysis of the sound wave signal. Furthermore, the cutting signal The frequency group and the cutting signal energy group are used to analyze the environmental sound wave interference and obtain the sound wave interference factor. This step comprehensively considers the frequency and energy characteristics of the sound wave signal to more comprehensively and accurately evaluate the degree of environmental interference to the sound wave signal. By obtaining the quantitative indicator of the sound wave interference factor, a clear and objective basis is provided for judging whether the sound wave signal is seriously interfered with and whether low-frequency switching and other operations are required in the future. If the sound wave interference factor is greater than the standard interference factor, the low-frequency filtering device is used to perform low-frequency switching on the target pickup to obtain a switching pickup. By switching the pickup, the working state of the target pickup is optimized and adjusted, so that it can receive and process sound wave signals within a more ideal frequency range, improve the sound wave signal reception quality and accuracy of the target pickup, and enhance the working performance of the pickup in an interference environment. At the same time, the construction of the low-frequency filtering device also makes up for the defect that the dynamic coil pickup cannot filter low-frequency sound waves in real time, and further enhances the environmental adaptability of the dynamic coil pickup. Therefore, the present invention can improve the quality of the sound wave signal received by the dynamic coil microphone and enhance the environmental adaptability of the dynamic coil microphone.

[0064] like Figure 2 , which is a functional module diagram of a low-frequency switching system of a moving coil pickup provided by an embodiment of the present invention.

[0065] The low-frequency switching system 100 of the dynamic pickup of the present invention can be installed in an electronic device. According to the functions to be implemented, the low-frequency switching system 100 of the dynamic pickup can include an original sound wave acquisition module 101, a sound wave signal cutting module 102, an interference factor calculation module 103 and a low-frequency sound wave filtering module 104. The module of the present invention can also be called a unit, which refers to a series of computer program segments that can be executed by a processor of an electronic device and can complete fixed functions, which are stored in the memory of the electronic device.

[0066] The original sound wave acquisition module 101 is used to receive a low-frequency switching instruction, determine a target pickup based on the low-frequency switching instruction, wherein the target pickup includes a low-frequency filtering device, and receive sound wave signals using the target pickup according to a preset sound wave analysis duration to obtain an original sound wave signal set, wherein the original sound wave signals in the original sound wave signal set are arranged from first to last according to the time sequence of acquisition, and the target pickup is a dynamic coil pickup; The acoustic signal cutting module 102 is used to cut the original acoustic signal set based on a preset signal cutting number to obtain a cutting acoustic signal group set, wherein the number of cutting acoustic signal groups in the cutting acoustic signal group set is the same as the signal cutting number, and the cutting acoustic signal groups are sequentially extracted from the cutting acoustic signal group set, and signal analysis is performed on the cutting acoustic signal groups to obtain cutting signal energy and cutting signal frequency; The interference factor calculation module 103 is used to respectively summarize the cutting signal frequency and cutting signal energy of each cutting acoustic wave signal group to obtain a cutting signal frequency group and a cutting signal energy group, and use the cutting signal frequency group and the cutting signal energy group to perform environmental acoustic wave interference analysis to obtain an acoustic wave interference factor; The low-frequency sound wave filtering module 104 is used to use the low-frequency filtering device to perform low-frequency switching on the target pickup to obtain a switched pickup if it is confirmed that the sound wave interference factor is greater than a preset standard interference factor, wherein the low-frequency filtering device includes: a cylindrical cavity, a perforated disc, a connecting chassis and tuning paper.

[0067] In detail, the modules in the low-frequency switching system 100 of the dynamic coil pickup in the embodiment of the present invention are used in the same manner as described above. Figure 1 The low-frequency switching method of the dynamic coil pickup described in the invention is the same as the technical means and can produce the same technical effect, so it will not be repeated here.

[0068] like Figure 3 , which is a schematic diagram of the structure of an electronic device for implementing a low-frequency switching method for a moving coil pickup provided by an embodiment of the present invention.

[0069] The electronic device 1 may include a processor 10, a memory 11 and a bus 12, and may also include a computer program stored in the memory 11 and executable on the processor 10, such as a low-frequency switching method program for a dynamic pickup.

[0070] The memory 11 includes at least one type of readable storage medium, and the readable storage medium includes a flash memory, a mobile hard disk, a multimedia card, a card-type memory (e.g., SD or DX memory, etc.), a magnetic memory, a disk, an optical disk, etc. In some embodiments, the memory 11 may be an internal storage unit of the electronic device 1, such as a mobile hard disk of the electronic device 1. In other embodiments, the memory 11 may also be an external storage device of the electronic device 1, such as a plug-in mobile hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (SecureDigital, SD) card, a flash card (Flash Card), etc. equipped on the electronic device 1. Further, the memory 11 also includes an internal storage unit of the electronic device 1 and an external storage device. The memory 11 can not only be used to store application software and various types of data installed in the electronic device 1, such as the code of the low-frequency switching method program of the moving coil pickup, etc., but also can be used to temporarily store data that has been output or is to be output.

[0071] The processor 10 may be composed of an integrated circuit in some embodiments, for example, a single packaged integrated circuit, or a plurality of packaged integrated circuits with the same or different functions, including one or more central processing units (CPUs), microprocessors, digital processing chips, graphics processors, and combinations of various control chips, etc. The processor 10 is the control core (Control Unit) of the electronic device, and uses various interfaces and lines to connect various components of the entire electronic device, and executes or executes programs or modules stored in the memory 11 (such as a low-frequency switching method program for a dynamic pickup, etc.), and calls data stored in the memory 11, so as to execute various functions of the electronic device 1 and process data.

[0072] The bus 12 may be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus, etc. The bus 12 may be divided into an address bus, a data bus, a control bus, etc. The bus 12 is configured to realize connection and communication between the memory 11 and at least one processor 10, etc.

[0073] Figure 3 Only an electronic device with components is shown, and those skilled in the art will understand that Figure 3 The structure shown does not constitute a limitation on the electronic device 1, and may include fewer or more components than shown in the figure, or combine certain components, or arrange the components differently.

[0074] For example, although not shown, the electronic device 1 may also include a power source (such as a battery) for supplying power to various components. Preferably, the power source may be logically connected to the at least one processor 10 through a power management system, so that the power management system can realize functions such as charging management, discharging management, and power consumption management. The power source may also include any components such as one or more DC or AC power sources, recharging systems, power failure detection circuits, power converters or inverters, and power status indicators. The electronic device 1 may also include a variety of sensors, Bluetooth modules, Wi-Fi modules, etc., which will not be repeated here.

[0075] Furthermore, the electronic device 1 may also include a network interface. Optionally, the network interface may include a wired interface and / or a wireless interface (such as a WI-FI interface, a Bluetooth interface, etc.), which is generally used to establish a communication connection between the electronic device 1 and other electronic devices.

[0076] Optionally, the electronic device 1 may further include a user interface, which may be a display, an input unit (such as a keyboard), or a standard wired interface or a wireless interface. Optionally, in some embodiments, the display may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, and an OLED (Organic Light-Emitting Diode) touch device. The display may also be appropriately referred to as a display screen or a display unit, which is used to display information processed in the electronic device 1 and to display a visual user interface.

[0077] The low-frequency switching method program of the dynamic coil pickup stored in the memory 11 of the electronic device 1 is a combination of multiple instructions. When running in the processor 10, it can achieve: receiving a low-frequency switching instruction, and determining a target pickup based on the low-frequency switching instruction, wherein the target pickup includes a low-frequency filtering device; According to a preset sound wave analysis time, a target microphone is used to receive sound wave signals to obtain an original sound wave signal set, wherein the original sound wave signals in the original sound wave signal set are arranged from earliest to latest according to the time sequence of acquisition, and the target microphone is a dynamic microphone; Based on a preset signal cutting number, the original sound wave signal set is cut to obtain a cut sound wave signal group set, wherein the number of cut sound wave signal groups in the cut sound wave signal group set is the same as the signal cutting number; Extracting cutting sound wave signal groups in sequence from the cutting sound wave signal group set, performing signal analysis on the cutting sound wave signal groups, and obtaining cutting signal energy and cutting signal frequency; Summarizing the cutting signal frequency and the cutting signal energy of each cutting sound wave signal group to obtain a cutting signal frequency group and a cutting signal energy group; Using the cutting signal frequency group and the cutting signal energy group, the environmental sound wave interference analysis is performed to obtain the sound wave interference factor; If it is confirmed that the sound wave interference factor is greater than the preset standard interference factor, the low-frequency filtering device is used to perform low-frequency switching on the target pickup to obtain a switched pickup, wherein the low-frequency filtering device includes: a cylindrical cavity, a perforated disc, a connecting chassis and a tuning paper; The low frequency switching of the dynamic pickup is completed based on the switching pickup.

[0078] Specifically, the specific implementation method of the processor 10 for the above instructions can refer to Figures 1 to 3 The description of the relevant steps in the corresponding embodiments will not be repeated here.

[0079] Furthermore, if the module / unit integrated in the electronic device 1 is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. The computer-readable storage medium can be volatile or non-volatile. For example, the computer-readable medium can include: any entity or system that can carry the computer program code, a recording medium, a USB flash drive, a mobile hard disk, a magnetic disk, an optical disk, a computer memory, and a read-only memory (ROM).

[0080] The present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor of an electronic device, the computer program can implement: receiving a low-frequency switching instruction, and determining a target pickup based on the low-frequency switching instruction, wherein the target pickup includes a low-frequency filtering device; According to a preset sound wave analysis time, a target microphone is used to receive sound wave signals to obtain an original sound wave signal set, wherein the original sound wave signals in the original sound wave signal set are arranged from earliest to latest according to the time sequence of acquisition, and the target microphone is a dynamic microphone; Based on a preset signal cutting number, the original sound wave signal set is cut to obtain a cut sound wave signal group set, wherein the number of cut sound wave signal groups in the cut sound wave signal group set is the same as the signal cutting number; Extracting cutting sound wave signal groups in sequence from the cutting sound wave signal group set, performing signal analysis on the cutting sound wave signal groups, and obtaining cutting signal energy and cutting signal frequency; Summarizing the cutting signal frequency and the cutting signal energy of each cutting sound wave signal group to obtain a cutting signal frequency group and a cutting signal energy group; Using the cutting signal frequency group and the cutting signal energy group, the environmental sound wave interference analysis is performed to obtain the sound wave interference factor; If it is confirmed that the sound wave interference factor is greater than the preset standard interference factor, the low-frequency filtering device is used to perform low-frequency switching on the target pickup to obtain a switched pickup, wherein the low-frequency filtering device includes: a cylindrical cavity, a perforated disc, a connecting chassis and a tuning paper; The low frequency switching of the dynamic pickup is completed based on the switching pickup.

[0081] In the several embodiments provided by the present invention, it should be understood that the disclosed devices, systems and methods can be implemented in other ways. For example, the system embodiments described above are only illustrative, and actual implementation may have other division methods.

[0082] The modules described as separate components may or may not be physically separated, and the components shown as modules may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0083] In addition, each functional module in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of hardware plus software functional modules.

[0084] It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention.

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention.

Claims

1. A low frequency switching method for a moving coil pickup, characterized in that: The method comprises: receiving a low-frequency switching instruction, and determining a target pickup based on the low-frequency switching instruction, wherein the target pickup includes a low-frequency filtering device; According to a preset sound wave analysis time, a target microphone is used to receive sound wave signals to obtain an original sound wave signal set, wherein the original sound wave signals in the original sound wave signal set are arranged from earliest to latest according to the time sequence of acquisition, and the target microphone is a dynamic microphone; Based on a preset signal cutting number, the original sound wave signal set is cut to obtain a cut sound wave signal group set, wherein the number of cut sound wave signal groups in the cut sound wave signal group set is the same as the signal cutting number; Extracting cutting sound wave signal groups in sequence from the cutting sound wave signal group set, performing signal analysis on the cutting sound wave signal groups, and obtaining cutting signal energy and cutting signal frequency; Summarizing the cutting signal frequency and the cutting signal energy of each cutting sound wave signal group to obtain a cutting signal frequency group and a cutting signal energy group; Using the cutting signal frequency group and the cutting signal energy group, the environmental sound wave interference analysis is performed to obtain the sound wave interference factor; If it is confirmed that the sound wave interference factor is greater than the preset standard interference factor, the low-frequency filtering device is used to perform low-frequency switching on the target pickup to obtain a switched pickup, wherein the low-frequency filtering device includes: a cylindrical cavity, a perforated disc, a connecting chassis and a tuning paper; The low frequency switching of the dynamic pickup is completed based on the switching pickup.

2. The low frequency switching method of the moving coil pickup as claimed in claim 1, characterized in that: The signal analysis of the cutting sound wave signal group to obtain the cutting signal energy and the cutting signal frequency includes: Identify the signal amplitude of each cutting sound wave signal in the cutting sound wave signal group to obtain a signal amplitude group, wherein the signal amplitude is a current value; Based on the signal amplitude group, the cutting signal energy is calculated using the following formula: in, represents the cutting signal energy, represents the number of signal amplitudes in the signal amplitude group, represents the cth signal amplitude in the signal amplitude group; Performing frequency identification on the cutting sound wave signal group to obtain a signal frequency group, wherein the number of signal frequencies in the signal frequency group is the same as the number of cutting sound wave signals in the cutting sound wave signal group; Based on the signal frequency group, a cutting signal frequency is calculated.

3. The low frequency switching method of the moving coil pickup as claimed in claim 2, characterized in that: The step of identifying the cutting signal frequency based on the signal frequency group includes: Based on the signal frequency groups, identifying a center signal frequency group; Using the central signal frequency group, frequency classification is performed on the signal frequency group to obtain an average classification frequency group and a classification frequency array, wherein a central signal frequency in the central signal frequency group corresponds to an average classification frequency in the average classification frequency group and a classification frequency number in the classification frequency array; Based on the average classification frequency group and the classification frequency array, the cutting signal frequency is calculated using the following formula: in, Indicates the cutting signal frequency, Represents the number of average category frequencies in the average category frequency group or the number of category frequencies in the category frequency array. Indicates the first The frequency of the categories, Represents the average classification frequency in the group The average classification frequency, Indicates the first The frequency of the categories.

4. The low frequency switching method of a moving coil pickup as claimed in claim 3, characterized in that: The step of identifying a center signal frequency group based on the signal frequency group includes: The signal frequencies to be identified are sequentially extracted from the signal frequency group, and the deviation values ​​to be identified of the signal frequencies to be identified are calculated, wherein the deviation values ​​to be identified are expressed as: in, represents the deviation value to be identified, Indicates the frequency of the signal to be identified, Indicates the first frequency in the signal frequency group The signal frequency, Indicates the number of signal frequencies in the signal frequency group; Summarizing the deviation values ​​to be identified to obtain a deviation value group to be identified, and identifying a center deviation value group in the deviation value group to be identified based on a preset number of classification centers, wherein the number of center deviation values ​​in the center deviation value group is the same as the number of classification centers; A central signal frequency group corresponding to the central deviation value group is identified in the signal frequency group.

5. The low frequency switching method of the moving coil pickup as claimed in claim 4, characterized in that: The method of using the central signal frequency group to perform frequency classification on the signal frequency group to obtain an average classification frequency group and a classification frequency array includes: extracting the center signal frequencies in the center signal frequency group in sequence; Calculating the center frequency difference between each signal frequency in the signal frequency group and the center signal frequency to obtain a center frequency difference group; Using a preset minimum frequency difference, the center frequency difference group is screened to obtain a frequency difference group to be classified, and a signal frequency group to be classified corresponding to the frequency difference group to be classified is identified in the signal frequency group, and the center signal frequency is aggregated with the signal frequency group to be classified to obtain a classified signal frequency group; Calculating the average classification frequency in the classification signal frequency group, and counting the number of classification frequencies in the classification signal frequency group; The average classification frequency and the number of classification frequencies corresponding to each central signal frequency are summarized respectively to obtain the average classification frequency group and the classification frequency array.

6. The low frequency switching method of a moving coil pickup as claimed in claim 5, characterized in that: The cutting signal frequency group and the cutting signal energy group are used to perform environmental sound wave interference analysis to obtain the sound wave interference factor, including: respectively calculating the total cutting signal frequency of the cutting signal frequency group and the total cutting signal energy of the cutting signal energy group; A frequency feature vector is constructed according to the total cutting signal frequency and the cutting signal frequency group, and an energy feature vector is constructed based on the total cutting signal energy and the cutting signal energy group, wherein the frequency feature vector and the energy feature vector are respectively expressed as: in, represents the frequency eigenvector, represents the first vector parameter in the frequency eigenvector, represents the first frequency feature vector vector parameters, represents the first frequency feature vector frequency eigenvectors, Indicates the first frequency in the cutting signal frequency group. Cutting signal frequency, Indicates the total cutting signal frequency, represents the energy eigenvector, represents the first vector parameter in the energy eigenvector, represents the energy eigenvector vector parameters, represents the energy eigenvector energy eigenvectors, Indicates the number of cutting signal energy groups The cutting signal energy, represents the total cutting signal energy; Based on the frequency eigenvector and the energy eigenvector, the environmental interference is evaluated to obtain the environmental interference factor.

7. The low frequency switching method of a moving coil pickup as claimed in claim 6, characterized in that: The environmental interference assessment is performed based on the frequency characteristic vector and the energy characteristic vector to obtain the environmental interference factor, including: Determine the working environment of the target pickup, analyze the sound wave signal of the working environment, and obtain the environmental frequency vector and environmental energy vector; The environmental interference factor is calculated according to the frequency characteristic vector, the energy characteristic vector, the environmental frequency vector and the environmental energy vector, wherein the environmental interference factor is expressed as: in, represents the environmental interference factor, Represents the vector dot product symbol, represents the ambient frequency vector, represents the ambient energy vector, Represents the magnitude symbol of a vector.

8. The low frequency switching method of a moving coil pickup as claimed in claim 7, characterized in that: Before the low-frequency switching of the target pickup by using the low-frequency filtering device to obtain the switched pickup, the method further comprises: Acquire a cylindrical cavity and confirm the bottom area of ​​the cylindrical cavity, wherein the cylindrical cavity includes: an open bottom surface and a closed bottom surface; Calculating a first opening area according to the bottom area and a preset small hole area ratio, wherein the first opening area is the product of the bottom area and the small hole area ratio; Determine a second opening area and a third opening area based on the bottom area, wherein the second opening area and the third opening area are both the same as the bottom area; According to the first opening area, the second opening area and the third opening area, a hole cutting is performed on a pre-constructed metal disc to obtain a holed disc, wherein the holed disc comprises: a first disc opening, a second disc opening and a third disc opening, the area of ​​the first disc opening, the area of ​​the second disc opening and the area of ​​the third disc opening are respectively: a first opening area, a second opening area and a third opening area, and a metal handle is provided at the edge of the holed disc; According to the perforated circular disc, a connecting chassis is obtained, wherein the area and shape of the connecting chassis are the same as those of the perforated circular disc, and the connecting chassis includes: a first chassis opening and a second chassis opening, and the areas of the first chassis opening and the second chassis opening are respectively the first opening area and the second opening area, and the positions of the first chassis opening and the second chassis opening in the connecting chassis are respectively the same as the positions of the first disc opening and the second disc opening in the perforated circular disc; The third disk opening in the perforated disk is covered with tuning paper to obtain a third tuning opening, and the cylindrical cavity, the perforated disk and the connecting chassis are connected to obtain a low-frequency filtering device, wherein the open bottom surface of the cylindrical cavity is connected to the bottom surface of the connecting chassis, and the other bottom surface of the connecting chassis is connected to the perforated disk.

9. The low frequency switching method of a moving coil pickup as claimed in claim 8, characterized in that: The method of using the low-frequency filtering device to perform low-frequency switching on the target pickup to obtain a switched pickup includes: Confirming the sound wave working state of the target pickup, wherein the sound wave working state includes: a normal working state and a low-frequency filtering state, in which the third tuning opening coincides with the second chassis opening in the normal working state, and in which the first disc opening and the second disc opening coincide with the first chassis opening and the second chassis opening respectively in the low-frequency filtering state, and the coincidence means that the two openings are in contact with each other and the central axes are aligned; If the target pickup is in a normal working state, the metal handle of the perforated disc is used to rotate the perforated disc until the first disc opening and the second disc opening in the perforated disc are respectively coincident with the first chassis opening and the second chassis opening in the connecting chassis, and the target pickup at this time is recorded as the switching pickup; If the target pickup is in the low frequency filtering state, the target pickup is recorded as a switching pickup.

10. A low frequency switching system for a moving coil pickup, characterized in that: The system comprises: An original sound wave acquisition module is used to receive a low-frequency switching instruction, determine a target pickup based on the low-frequency switching instruction, wherein the target pickup includes a low-frequency filtering device, and receive sound wave signals using the target pickup according to a preset sound wave analysis duration to obtain an original sound wave signal set, wherein the original sound wave signals in the original sound wave signal set are arranged from first to last according to the time sequence of acquisition, and the target pickup is a dynamic coil pickup; The acoustic signal cutting module is used to cut the original acoustic signal set based on a preset signal cutting number to obtain a cutting acoustic signal group set, wherein the number of cutting acoustic signal groups in the cutting acoustic signal group set is the same as the signal cutting number, and the cutting acoustic signal groups are sequentially extracted from the cutting acoustic signal group set, and the cutting acoustic signal groups are subjected to signal analysis to obtain the cutting signal energy and the cutting signal frequency; An interference factor calculation module is used to respectively summarize the cutting signal frequency and cutting signal energy of each cutting acoustic wave signal group to obtain a cutting signal frequency group and a cutting signal energy group, and use the cutting signal frequency group and the cutting signal energy group to perform environmental acoustic wave interference analysis to obtain an acoustic wave interference factor; The low-frequency sound wave filtering module is used to use the low-frequency filtering device to perform low-frequency switching on the target pickup to obtain a switched pickup if it is confirmed that the sound wave interference factor is greater than a preset standard interference factor, wherein the low-frequency filtering device includes: a cylindrical cavity, a perforated disc, a connecting chassis and tuning paper.

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