CN112185336A - Noise reduction method, device and equipment - Google Patents
Noise reduction method, device and equipment Download PDFInfo
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- CN112185336A CN112185336A CN202011044163.1A CN202011044163A CN112185336A CN 112185336 A CN112185336 A CN 112185336A CN 202011044163 A CN202011044163 A CN 202011044163A CN 112185336 A CN112185336 A CN 112185336A
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- 230000009467 reduction Effects 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000005236 sound signal Effects 0.000 claims description 25
- 239000003990 capacitor Substances 0.000 claims description 13
- 230000015654 memory Effects 0.000 claims description 9
- 238000004590 computer program Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 12
- 238000001914 filtration Methods 0.000 abstract description 11
- 238000010586 diagram Methods 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 230000006870 function Effects 0.000 description 2
- 238000013507 mapping Methods 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1785—Methods, e.g. algorithms; Devices
- G10K11/17853—Methods, e.g. algorithms; Devices of the filter
Abstract
The embodiment of the application provides a noise reduction method, a device and equipment, wherein the noise reduction method comprises the following steps: acquiring frequency information of a noise signal; and gating a corresponding filter circuit to filter the noise signal according to the frequency information. This application has realized improving unmanned aerial vehicle radio reception effect to the automatic filtering of different noises.
Description
Technical Field
The application relates to the technical field of unmanned aerial vehicles, in particular to a noise reduction method, a device and equipment.
Background
In recent years, with the gradual maturity of unmanned aerial vehicle technology, unmanned aerial vehicles have been widely used in many fields. Unmanned aerial vehicle generally can have the radio reception function, but the sound of gathering is usually along with multiple noise, for example at unmanned aerial vehicle's flight in-process, self screw can be high-speed rotatory, produces a large amount of noises to and under weather conditions such as wind, rainy, also can have more ambient noise, and current unmanned aerial vehicle can only filter single noise, therefore unmanned aerial vehicle's radio reception effect is not ideal.
Disclosure of Invention
An object of the embodiment of the application is to provide a noise reduction method, a noise reduction device and noise reduction equipment, which are used for automatically filtering different noises and improving the radio effect of an unmanned aerial vehicle.
A first aspect of an embodiment of the present application provides a noise reduction method, including: acquiring frequency information of a noise signal; and gating a corresponding filter circuit to filter the noise signal according to the frequency information.
In an embodiment, the acquiring the frequency information of the noise signal includes: acquiring rotor rotating speed information of the unmanned aerial vehicle; and inquiring first frequency information of a first noise signal corresponding to the rotor rotation speed information in a preset database according to the rotor rotation speed information.
In an embodiment, the gating the corresponding filter circuit to filter the noise signal according to the frequency information includes: and according to the first frequency information, gating a first filter circuit corresponding to the first frequency information to filter the first noise signal.
In an embodiment, after the gating the corresponding filter circuit to filter the noise signal according to the frequency information, the method further includes: collecting a sound signal; judging whether a second noise signal with the frequency within a preset frequency range exists in the sound signal or not; when the second noise signal exists in the sound signal, acquiring second frequency information of the second noise signal; and according to the second frequency information, gating a second filter circuit corresponding to the second frequency information to filter the second noise signal.
A second aspect of the embodiments of the present application provides a noise reduction apparatus, including: the first acquisition module is used for acquiring frequency information of the noise signal; and the first gating module is used for gating a corresponding filter circuit to filter the noise signal according to the frequency information.
In one embodiment, the first obtaining module is configured to: acquiring rotor rotating speed information of the unmanned aerial vehicle; and inquiring first frequency information of a first noise signal corresponding to the rotor rotation speed information in a preset database according to the rotor rotation speed information.
In one embodiment, the first gating module is configured to: and according to the first frequency information, gating a first filter circuit corresponding to the first frequency information to filter the first noise signal.
In one embodiment, the noise reduction apparatus further includes: the acquisition module is used for acquiring sound signals; the judging module is used for judging whether a second noise signal with the frequency within a preset frequency range exists in the sound signal or not; a second obtaining module, configured to obtain second frequency information of the second noise signal when the second noise signal exists in the sound signal; and the second gating module is used for gating a second filter circuit corresponding to the second frequency information to filter the second noise signal according to the second frequency information.
A third aspect of embodiments of the present application provides an electronic device, including: a memory to store a computer program; a processor configured to perform the method of the first aspect of the embodiments of the present application and any of the embodiments thereof; a plurality of filter circuits connected to the processor; and the sound receiving device is connected with the filter circuit.
In one embodiment, the filter circuit includes: the first end of the resistor is connected with the sound receiving device; one end of the capacitor is connected with the second end of the resistor, and the other end of the capacitor is grounded; and one end of the switch is connected with the second end of the resistor, the other end of the switch is connected with the processor, and the switch is connected or disconnected according to the instruction of the processor.
In one embodiment, the noise frequency corresponding to the filter circuit is calculated using the following equation:
where f denotes the noise frequency, pi denotes a circumferential ratio, R denotes a resistance value, and C denotes a capacitance value.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a noise reduction apparatus according to an embodiment of the present application;
FIG. 2 is a schematic flow chart illustrating a noise reduction method according to another embodiment of the present application;
FIG. 3 is a flow chart illustrating a noise reduction method according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a noise reduction device according to an embodiment of the present application.
Reference numerals:
100-noise reduction equipment, 110-memory, 120-processor, 130-filter circuit, 131-resistor, 132-capacitor, 133-switch, 140-radio device, 150-bus, 400-noise reduction device, 410-first acquisition module, 420-first gating module, 430-acquisition module, 440-judgment module, 450-second acquisition module and 460-second gating module.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
In the description of the present application, the terms "first," "second," and the like are used for distinguishing between descriptions and do not denote an order of magnitude, nor are they to be construed as indicating or implying relative importance.
In the description of the present application, the terms "comprises," "comprising," and/or the like, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof.
In the description of the present application, the terms "mounted," "disposed," "provided," "connected," and "configured" are to be construed broadly unless expressly stated or limited otherwise. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be internal to two devices, elements or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
Please refer to fig. 1, which is a schematic structural diagram of a noise reduction apparatus 100 according to an embodiment of the present application. The noise reduction device 100 includes a memory 110, at least one processor 120, a plurality of filter circuits 130, and a sound receiving apparatus 140, one processor being exemplified in fig. 1. Wherein the memory 110 and the processors 120 are connected by a bus 150, the memory 110 storing instructions executable by the at least one processor 120, the instructions being executable by the at least one processor 120 to cause the at least one processor 120 to perform a noise reduction method as in the embodiments described below. The input end of the filter circuit 130 is connected to the sound receiving device 140, and in an embodiment, the sound receiving device 140 may be a microphone or a microphone array. An output of the filter circuit 130 is connected to an audio input interface of the processor 120. The filter circuits 130 are connected in parallel with each other.
In an embodiment, the noise reduction apparatus 100 may be applied to an unmanned aerial vehicle, and may also be applied to other electronic devices with a sound receiving function.
In one embodiment, the filter circuit 130 includes: the radio receiver comprises a resistor 131, a capacitor 132 and a switch 133, wherein a first end of the resistor 131 is connected with the radio receiver 140, one end of the capacitor 132 is connected with a second segment of the resistor 131, the other end of the capacitor 132 is grounded, one end of the switch 133 is connected with a second end of the resistor 131, and the other end of the switch 133 is connected with the processor 120. In an embodiment, the processor 120 may send a command to the switch 133 through the GP io interface to control the switch 133 to be turned on or off, when the switch 133 is turned on, the sound receiving device 140 may collect a sound signal and convert the sound signal into an electrical signal, and the electrical signal is filtered by the filter circuit 130 with the switch 133 in a connected state and then input to the processor 120 through the audio input interface of the processor 120.
In one embodiment, in the plurality of filter circuits 130, each filter circuit 130 may be configured to filter noise with a different frequency, and the noise frequency that the filter circuit 130 may filter is related to the product of the resistance value and the capacitance value in the filter circuit 130. The noise frequency that can be filtered out for each filter circuit 130 can be calculated by the following formula:
where f denotes a noise frequency, pi denotes a circumferential ratio, R denotes a resistance value of the resistor 131, and C denotes a capacitance value of the capacitor 132.
In an embodiment, the plurality of filter circuits 130 may be implemented by using a plurality of resistors 131 having equal resistance values and a plurality of capacitors 132 having unequal capacitance values, so as to achieve the effect of simultaneously filtering out various noises having unequal frequencies, or by using a plurality of resistors 131 having unequal resistance values and a plurality of capacitors 132 having equal capacitance values, so as to achieve the effect of simultaneously filtering out various noises having unequal frequencies, or by using a plurality of resistors 131 having unequal resistance values and a plurality of capacitors 132 having unequal capacitance values, so as to make products of the resistance value of each resistor 131 and the capacitance value of the capacitor 132 in the same filter circuit 130 unequal, so as to achieve the effect of simultaneously filtering out various noises having unequal frequencies.
Fig. 2 is a flow chart illustrating a noise reduction method according to an embodiment of the present invention, which can be executed by the noise reduction apparatus 100 shown in fig. 1 to automatically filter noises with different frequencies. The method comprises the following steps:
step 201: frequency information of the noise signal is acquired.
In the above steps, frequency information of a noise signal is obtained, where the noise signal includes working noise generated by the unmanned aerial vehicle itself and/or external environmental noise, and in the actual flight process of the unmanned aerial vehicle, noise is generated by air inlet and outlet of the engine and rotation of the propeller, and the environmental noise includes, but is not limited to, wind noise, rain noise, car whistle noise, and the like, and the noise seriously affects the sound reception effect of the target sound.
Step 202: and according to the frequency information, gating a corresponding filter circuit to filter the noise signal.
In the above step, since the frequency of each noise is fixed, a filter circuit corresponding to each frequency information may be preset according to the frequency information of each noise, and a mapping relationship between different frequency information and the filter circuit may be established. And generating a corresponding control instruction according to the acquired frequency information of the noise signal, so that a switch in a filter circuit corresponding to the frequency information is closed, and the filter circuit is communicated, thereby filtering the noise signal.
In an embodiment, since the collected sound signal may include one or more noise signals, and the one or more frequency information may be acquired in step 201, the one or more filter circuits may also be gated correspondingly in step 202. In an embodiment, when there are multiple noise signals, multiple different frequency information may be acquired, multiple corresponding filter circuits may be gated simultaneously, or multiple corresponding filter circuits may be gated sequentially.
Fig. 3 is a flow chart illustrating a noise reduction method according to an embodiment of the present invention, which can be executed by the noise reduction apparatus 100 shown in fig. 1 to automatically filter noises with different frequencies. The method comprises the following steps:
step 301: and acquiring the rotor rotating speed information of the unmanned aerial vehicle.
In the above steps, the rotor of the drone includes, but is not limited to, a propeller, an engine rotor, etc. which may generate noise, and the rotor rotation speed information includes, but is not limited to, a rotation speed, a rotation frequency, an angular speed, an angular frequency, etc. Under different mode or operating condition, unmanned aerial vehicle's rotor rotational speed information is different, for example: the rotor speed of the unmanned aerial vehicle in the high-speed mode is greater than that in the low-speed mode, the rotor speed information basically keeps unchanged in the process of stable flight or hovering of the unmanned aerial vehicle, and the rotor speed information dynamically changes in the process of ascending flight or descending flight.
In an embodiment, the rotor speed information of the unmanned aerial vehicle can be acquired according to the working mode and/or the working state of the unmanned aerial vehicle, and the rotor speed information of the unmanned aerial vehicle can also be acquired through the detection of the speed sensor.
Step 302: according to the rotor rotating speed information, first frequency information of a first noise signal corresponding to the rotor rotating speed information is inquired in a preset database.
In the above step, the first noise signal refers to working noise generated by the unmanned aerial vehicle itself, different rotor rotation speed information, and different first frequency information of the corresponding first noise signal, each rotor rotation speed information has fixed first frequency information, and a mapping relation table of the rotor rotation speed information and the first frequency information is stored in a preset database in advance. According to the rotor speed information, the first frequency information of the first noise signal corresponding to the rotor speed information can be inquired in a preset database.
Step 303: according to the first frequency information, a first filter circuit corresponding to the first frequency information is gated to filter the first noise signal.
In the above step, the first filter circuit corresponding to the first frequency information is gated according to the first frequency information, so as to achieve the effect of filtering the first noise signal. The resistance value in the first filter circuit is R1A capacitance value of C1Both of them and the first frequency information f1The relationship of (a) is as follows:
step 304: and collecting sound signals.
In the above step, the sound signal is collected by the microphone, and the first noise signal in the sound signal has been filtered by the first filter circuit, so that the collected sound signal does not include the first noise signal.
Step 305: and judging whether a second noise signal with the frequency within a preset frequency range exists in the sound signal.
In the above step, the second noise signal refers to external environmental noise, different environmental noises also have different fixed frequencies, the preset frequency range may enable all or part of the noise frequencies to be included in the preset frequency range, and may be set as required in practical applications, but the preset frequency range cannot include the frequency of the target sound, and the target sound refers to the sound desired to be collected. In an embodiment, if the requirement for the sound reception effect of the target sound is high, a relatively large preset frequency range may be set, and if the requirement for the sound reception effect of the target sound is low, a relatively small preset frequency range may be set. Determining whether a second noise signal with a frequency within a preset frequency range exists in the sound signal, and if the second noise signal exists in the sound signal, executing step 306.
Step 306: second frequency information of the second noise signal is acquired.
Step 307: and gating a second filter circuit corresponding to the second frequency information according to the second frequency information to filter the second noise signal.
In the above step, according to the second frequency information, the second filter circuit corresponding to the second frequency information is gated, so as to achieve the effect of filtering the second noise signal. The resistance value in the second filter circuit is R2A capacitance value of C2Both of them and second frequency information f1The relationship of (a) is as follows:
in an embodiment, the number of the second noise signals may be one or more, and when there are a plurality of second noise signals, a plurality of different second frequency information may be acquired, the plurality of corresponding second filtering circuits may be gated simultaneously, or the plurality of corresponding second filtering circuits may be gated sequentially.
As shown in fig. 4, which is a schematic structural diagram of a noise reduction apparatus 400 according to an embodiment of the present application, the apparatus can be applied to the noise reduction device 100 shown in fig. 1, and includes: the system comprises a first acquisition module 410, a first gating module 420, an acquisition module 430, a judgment module 440, a second acquisition module 450 and a second gating module 460. The principle relationship of the modules is as follows:
the first obtaining module 410 is configured to obtain frequency information of the noise signal.
The first gating module 420 is configured to gate the corresponding filter circuit to filter the noise signal according to the frequency information.
And the collecting module 430 is used for collecting the sound signal.
The determining module 440 is configured to determine whether a second noise signal with a frequency within a preset frequency range exists in the sound signal.
The second obtaining module 450 is configured to obtain second frequency information of a second noise signal when the second noise signal exists in the sound signal.
The second gating module 460 is configured to gate the second filtering circuit corresponding to the second frequency information to filter the second noise signal according to the second frequency information.
In one embodiment, the first obtaining module 410 is configured to: acquiring rotor rotating speed information of the unmanned aerial vehicle; according to the rotor rotating speed information, first frequency information of a first noise signal corresponding to the rotor rotating speed information is inquired in a preset database.
In one embodiment, the first gating module 420 is configured to: according to the first frequency information, a first filter circuit corresponding to the first frequency information is gated to filter the first noise signal.
The principle and the resulting technical effect of the noise reduction apparatus 400 provided in this embodiment are the same as those of the above-mentioned embodiment, and for a brief description, please refer to the description of the related method steps in the above-mentioned embodiment, where no part of the embodiment of the apparatus is mentioned.
An embodiment of the present invention further provides a storage medium readable by an electronic device, including: a program that, when run on an electronic device, causes the electronic device to perform all or part of the procedures of the methods in the above-described embodiments. The storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a Flash Memory (Flash Memory), a Hard Disk (Hard Disk Drive, abbreviated as HDD), a Solid State Drive (SSD), or the like. The storage medium may also comprise a combination of memories of the kind described above.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. The above description is only a preferred embodiment of the present application, and is only for the purpose of illustrating the technical solutions of the present application, and not for the purpose of limiting the present application. Any modification, equivalent replacement, improvement or the like, which would be obvious to one of ordinary skill in the art and would be within the spirit and principle of the present application, should be included within the scope of the present application.
Claims (10)
1. A method of noise reduction, comprising:
acquiring frequency information of a noise signal;
and gating a corresponding filter circuit to filter the noise signal according to the frequency information.
2. The method according to claim 1, wherein the obtaining frequency information of the noise signal comprises:
acquiring rotor rotating speed information of the unmanned aerial vehicle;
and inquiring first frequency information of a first noise signal corresponding to the rotor rotation speed information in a preset database according to the rotor rotation speed information.
3. The method of claim 2, wherein the gating the corresponding filter circuit to filter the noise signal according to the frequency information comprises:
and according to the first frequency information, gating a first filter circuit corresponding to the first frequency information to filter the first noise signal.
4. The method of claim 1, further comprising, after the gating the corresponding filter circuit to filter the noise signal according to the frequency information:
collecting a sound signal;
judging whether a second noise signal with the frequency within a preset frequency range exists in the sound signal or not;
when the second noise signal exists in the sound signal, acquiring second frequency information of the second noise signal;
and according to the second frequency information, gating a second filter circuit corresponding to the second frequency information to filter the second noise signal.
5. A noise reduction device, comprising:
the first acquisition module is used for acquiring frequency information of the noise signal;
and the first gating module is used for gating a corresponding filter circuit to filter the noise signal according to the frequency information.
6. The noise reduction device of claim 5, wherein the first obtaining module is configured to:
acquiring rotor rotating speed information of the unmanned aerial vehicle;
and inquiring first frequency information of a first noise signal corresponding to the rotor rotation speed information in a preset database according to the rotor rotation speed information.
7. The noise reduction device of claim 5, further comprising:
the acquisition module is used for acquiring sound signals;
the judging module is used for judging whether a second noise signal with the frequency within a preset frequency range exists in the sound signal or not;
a second obtaining module, configured to obtain second frequency information of the second noise signal when the second noise signal exists in the sound signal;
and the second gating module is used for gating a second filter circuit corresponding to the second frequency information to filter the second noise signal according to the second frequency information.
8. A noise reduction device, comprising:
a memory to store a computer program;
a processor to perform the method of any one of claims 1 to 4;
a plurality of filter circuits connected to the processor;
and the sound receiving device is connected with the filter circuit.
9. The noise reduction device of claim 8, wherein the filter circuit comprises:
the first end of the resistor is connected with the sound receiving device;
one end of the capacitor is connected with the second end of the resistor, and the other end of the capacitor is grounded;
and one end of the switch is connected with the second end of the resistor, the other end of the switch is connected with the processor, and the switch is connected or disconnected according to the instruction of the processor.
10. The noise reduction device according to claim 9, wherein the noise frequency corresponding to the filter circuit is calculated using the following equation:
where f denotes the noise frequency, pi denotes a circumferential ratio, R denotes a resistance value, and C denotes a capacitance value.
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| CN202011044163.1A CN112185336A (en) | 2020-09-28 | 2020-09-28 | Noise reduction method, device and equipment |
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Cited By (1)
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| WO2023108937A1 (en) * | 2021-12-17 | 2023-06-22 | 上海微创生命科技有限公司 | Method for reducing glucose monitoring signal noise, readable storage medium and glucose management system |
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