Noise reduction pickup equipment and noise reduction pickup methods

Abstract

This invention provides a noise reduction and sound pickup device and method. The noise reduction and sound pickup device includes at least one noise pickup, a target sound pickup device, and a sound signal processing unit. The at least one noise pickup is positioned close to a corresponding noise source, suitable for acquiring ambient noise emitted by the noise source and generating an ambient noise frequency signal. The target sound pickup device is positioned close to a target sound source, suitable for acquiring the target sound from the target sound source and generating a target sound frequency signal. The sound signal processing unit inverts and amplifies at least a portion of the frequency signal in the ambient noise frequency signal, superimposes the inverted and amplified ambient noise signal with the target sound signal to obtain a useful sound, and outputs the useful sound. The noise reduction and sound pickup device and method can acquire and eliminate various complex noises emitted by large equipment, while simultaneously preserving and amplifying the required sound signal to ensure normal voice communication and improve communication quality.

Description

Technical Field

[0001] This invention relates to the field of audio processing technology, and in particular to a noise reduction pickup device and a noise reduction pickup method. Background Technology

[0002] In large medical devices (such as radiotherapy / radiation equipment and MRI equipment operating in enclosed environments), the working environment is often filled with complex environmental noise. Especially during patient treatment, various mechanical and electrical devices generate various noises, such as mechanical noise from fans, pumps, chains, pneumatic devices, belts, and other moving parts, as well as radio frequency high-frequency noise. These various noises mix together, and because the shielded room is a nearly completely enclosed environment, the noise level is further amplified, causing significant obstacles to verbal communication between patients and operators during examinations or treatments.

[0003] To ensure effective communication between the technician outside the treatment room and the patient inside, a microphone is typically installed to capture all sound from the room. After the microphone picks up the sound, some is directly transmitted to an external loudspeaker for broadcast, while other sounds are processed using software filtering to reduce ambient noise. While this software filtering method can reduce some ambient noise, it can significantly impact the patient's voice quality. In severe cases, algorithmic errors may cause parts of the patient's speech to be missed, leading to misunderstandings of the patient's meaning.

[0004] Therefore, to clearly hear patients' voices on the treatment bed, most current devices place the microphone as close to the patient's mouth as possible. However, communication with patients remains quite difficult due to excessive noise, failing to achieve ideal communication results. Because the microphone is fixed to the device, it's difficult to obtain the patient's voice signal at close range as the treatment device moves or the patient's position changes. Some medical devices, in order to better hear the patient, have to install the microphone in the closest possible position to the patient and fix it in place, minimizing the distance. However, this introduces the risk that the microphone, being too close to the radiation outlet window, will be directly or indirectly exposed to radiation, significantly reducing its lifespan or causing interference that renders it malfunctioning. Summary of the Invention

[0005] This invention provides a noise reduction sound pickup device and a noise reduction sound pickup method. The noise reduction sound pickup device and method can collect and eliminate various complex noises emitted by large equipment, while retaining and amplifying the required sound signals to ensure normal voice communication and improve communication quality.

[0006] According to one aspect of an embodiment of the present invention, a noise reduction and sound pickup device is provided, comprising at least one noise pickup, a target sound pickup device, and a sound signal processing unit. The at least one noise pickup is positioned close to a corresponding noise source and is adapted to acquire ambient noise emitted by the noise source and generate an ambient noise frequency signal. The target sound pickup device is positioned close to a target sound source and is adapted to acquire the target sound from the target sound source and generate a target sound frequency signal. The sound signal processing unit inverts and amplifies at least a portion of the frequency signal in the ambient noise frequency signal, superimposes the inverted and amplified ambient noise frequency signal with the target sound frequency signal to obtain a useful sound, and outputs the useful sound.

[0007] Furthermore, the environmental noise frequency signal can be a real-time signal.

[0008] Optionally, the sound signal processing unit includes a signal delay module, which controls the delay of the ambient noise frequency signal to synchronize the ambient noise frequency signal with the target audio frequency signal.

[0009] Optionally, the sound signal processing unit further includes at least one noise processing module, a target tone follower amplifier, a target tone in-phase amplifier, and an inverting adder. The at least one noise processing module is positioned close to the corresponding noise pickup in the at least one noise pickup, and each of the at least one noise processing module includes a noise follower amplifier that amplifies the received ambient noise frequency signal in-phase, a signal delay module whose input is connected to the output of the noise follower amplifier, and a noise inverting amplifier whose input is connected to the output of the signal delay module. The target tone follower amplifier amplifies the received target audio frequency signal in-phase, and the input of the target tone in-phase amplifier is connected to the target tone follower amplifier. The input of the inverting adder is connected to the outputs of the noise inverting amplifier and the target tone in-phase amplifier, and superimposes the amplified ambient noise frequency signal with the target audio frequency signal.

[0010] Optionally, the noise processing module is provided with a first adjustable resistor connected in parallel with the noise inverting amplifier.

[0011] In addition, the signal delay module includes an adjustable capacitor and a fixed resistor, which are connected in series between the output of the noise follower amplifier and the input of the noise inverting amplifier.

[0012] Furthermore, the ambient noise frequency signal includes a first ambient noise frequency signal and a second ambient noise frequency signal. The first ambient noise frequency signal is the ambient noise frequency signal that has been inverted and amplified by the sound signal processing unit. The noise processing module also includes a noise in-phase amplifier and a programmable switch. The input terminal of the noise in-phase amplifier is connected to the output terminal of the noise follower amplifier, which is suitable for in-phase amplification of the amplified second ambient noise frequency signal into useful noise. The input terminal of the programmable switch is connected to the output terminal of either the noise in-phase amplifier or the noise in-phase amplifier, and the output terminal of the programmable switch is connected to the input terminal of the inverting adder.

[0013] Optionally, the noise processing module is provided with a second adjustable resistor connected in parallel with the noise in-phase amplifier.

[0014] Additionally, the target sound pickup device may include a radiation-proof housing and a target sound pickup. The radiation-proof housing is a hollow shell to form a sound cavity, and the radiation-proof housing is provided with at least one labyrinth, each of which has one end connected to a sound guide tube and the other end communicating with the sound cavity. The target sound pickup is disposed within the sound cavity.

[0015] Preferably, the sound guide tube may have a bent tube shape.

[0016] Optionally, at least one labyrinthine slope extends through the radiation shielding shell.

[0017] In addition, the radiation shield can be designed with multiple labyrinths that are separated from each other.

[0018] Furthermore, the radiation shielding shell may also be provided with a sound insulation layer covering the outer surface of the radiation shielding shell.

[0019] In addition, the output of the audio signal processing unit can be connected to a speaker.

[0020] According to another aspect of the present invention, a noise reduction sound pickup method is proposed, comprising: acquiring ambient noise of a corresponding noise source and generating an ambient noise frequency signal by means of at least one noise pickup device; acquiring a target sound of a target sound source and generating a target sound frequency signal by means of a target sound pickup device; and inverting and amplifying at least a portion of the frequency signal in the ambient noise frequency signal, superimposing the inverted and amplified ambient noise frequency signal with the target sound frequency signal to obtain a useful sound, and outputting the useful sound.

[0021] Furthermore, the environmental noise frequency signal can be a real-time signal.

[0022] Optionally, the step of inverting and amplifying at least a portion of the frequency signals in the ambient noise frequency signal and superimposing the inverted and amplified ambient noise frequency signal with the target audio frequency signal may include: amplifying the ambient noise frequency signal and the target audio frequency signal in phase; controlling the delay of the amplified ambient noise frequency signal to keep the ambient noise frequency signal synchronized with the target audio frequency signal; flipping the phase of the at least a portion of the ambient noise frequency signal and amplifying the amplitude of the at least a portion of the ambient noise frequency signal, and amplifying the amplitude of the target audio frequency signal to match the amplitude of the target audio frequency signal; and superimposing the at least a portion of the ambient noise frequency signal and the target audio frequency signal to remove signals in the target audio frequency signal that have the same frequency as the at least a portion of the ambient noise frequency signal to obtain useful sound.

[0023] Furthermore, after delaying the amplified ambient noise frequency signal to synchronize it with the target audio frequency signal, the noise reduction pickup method further includes: determining whether the frequency of the ambient noise frequency signal is within a first preset frequency range or a second preset frequency range; and when the ambient noise frequency signal is determined to be within the first preset frequency range, amplifying the ambient noise frequency signal in reverse phase and superimposing it with the target audio frequency signal; or when the ambient noise frequency signal is determined to be within the second preset frequency range, amplifying the ambient noise frequency signal in phase and outputting it. Attached Figure Description

[0024] The above and other aspects and features of the present invention will become clear from the following description of embodiments taken in conjunction with the accompanying drawings, wherein:

[0025] Figure 1 This is a schematic diagram of a noise reduction pickup device according to an embodiment of the present invention;

[0026] Figure 2 A circuit diagram of a sound signal processing unit according to an embodiment of the present invention; and

[0027] Figure 3 This is a schematic diagram of a target sound pickup device according to an embodiment of the present invention. Detailed Implementation

[0028] The illustrative and non-limiting embodiments of the present invention will now be described in detail with reference to the accompanying drawings, further illustrating the noise reduction pickup device and noise reduction pickup method according to the present invention.

[0029] Figure 1A schematic diagram of a noise-reducing audio pickup device according to an embodiment of the present invention is shown. In this embodiment, the noise-reducing audio pickup device 100 includes at least one noise pickup 10, a target sound pickup device 20, and a sound signal processing unit 30. The at least one noise pickup 10 is positioned close to a corresponding noise source, acquiring ambient noise emitted by the noise source and generating an ambient noise frequency signal. The target sound pickup device 20 is positioned close to a target sound source (e.g., a patient), acquiring the target sound from the target sound source and generating a target audio frequency signal. The sound signal processing unit 30 inverts and amplifies at least a portion of the frequency signal in the ambient noise frequency signal, superimposes the inverted and amplified ambient noise frequency signal with the target audio frequency signal to obtain a useful sound, and outputs the useful sound. The noise-reducing audio pickup device of the present invention performs hardware noise reduction processing on the noise source signal and the noise contained in the target sound source, directly filtering out unwanted noise and ensuring that the final transmitted audio signal retains the useful signal. Thus, the noise-reducing audio pickup device can filter out most of the noise emitted by medical equipment, and after noise reduction processing of the patient's voice signal, it is sent to external operators for listening. Therefore, it is crucial to ensure smooth communication and interaction between doctors and patients, and to take timely measures in case of emergencies (such as a patient calling for help or equipment emitting abnormal sounds) to prevent greater losses.

[0030] like Figure 1 The illustration shows an exemplary embodiment with multiple noise sources. A noise pickup 10 is positioned near each noise source to be filtered, used to collect ambient noise (e.g., frequency and amplitude) emitted by different noise sources. This multi-point noise sampling method enables direct, fixed-point, real-time sampling of each noise source, while simultaneously sampling useful sound sources that need to be retained (e.g., alarm sounds, human voices, etc.). Then, the useful sound is obtained by hardware filtering the noise picked up by each noise source pickup with the signal of the target sound. Further, in one embodiment, the output of the sound signal processing unit 30 is connected to a speaker 40 to output the finally obtained useful sound.

[0031] In one embodiment, the ambient noise frequency signal can be a real-time signal. Further optionally, the audio signal processing unit 30 includes a signal delay module that controls the delay of the ambient noise frequency signal to synchronize it with the target audio frequency signal.

[0032] Furthermore, in one embodiment, the sound signal processing unit 30 further includes at least one noise processing module, a target tone follower amplifier 31, a target tone in-phase amplifier 32, and an inverting adder 33, wherein the input terminal of the target tone in-phase amplifier 32 is connected to the target tone follower amplifier 31. Figure 2As shown, each noise processing module is positioned close to its corresponding noise pickup and includes a noise follower amplifier 34, a signal delay module, and a noise inverting amplifier 35. The input of the signal delay module is connected to the output of the noise follower amplifier 34, and the input of the noise inverting amplifier 35 is connected to the output of the signal delay module. The input of the inverting adder 33 is connected to the output of the noise inverting amplifier 35 and the output of the target tone in-phase amplifier 32. The noise follower amplifier 34 amplifies the received ambient noise frequency signal in phase, and the amplified ambient noise frequency signal is always synchronized with the target tone frequency signal under the control and adjustment of the signal delay module. Then, the ambient noise frequency signal is transmitted to the noise inverting amplifier 35 and inverted, while the amplitude of the ambient noise frequency signal is amplified. The target tone follower amplifier 31 amplifies the received target tone frequency signal in phase, and the amplitude of the inverted amplified ambient noise frequency signal matches the amplitude of the same frequency signal in the in-phase amplified target tone frequency signal. The inverting adder 33 superimposes the amplified ambient noise frequency signal with the amplified target audio frequency signal, thereby filtering out unwanted noise and ensuring that the final output audio signal mainly retains the useful audio signal.

[0033] like Figure 2 As shown, in one exemplary embodiment, the noise processing module may be provided with a first adjustable resistor R5 connected in parallel with the noise inverting amplifier 35. The first adjustable resistor R5 is used to adjust the amplification amplitude of the noise frequency signal to ensure that the amplitude of the noise frequency signal after adjustment matches the amplitude of the signal of the same frequency in the target sound source, thereby ensuring that the noise signal of that frequency in the target sound source is suppressed and controlled.

[0034] Furthermore, the signal delay module may include an adjustable capacitor C2 and a fixed resistor L1, which are connected in series between the output of the noise follower amplifier 34 and the input of the noise inverting amplifier 35. The adjustable capacitor C2 and the fixed resistor L1 control the delay of the noise frequency signal so that the ambient noise frequency signal is synchronized with the target audio frequency signal.

[0035] In one embodiment, the ambient noise frequency signal includes a first ambient noise frequency signal and a second ambient noise frequency signal, wherein the first ambient noise frequency signal is an ambient noise frequency signal that has been inverted and amplified by the sound signal processing unit 30. The noise processing module may further include a noise in-phase amplifier 36 and a programmable switch. For example, in... Figure 2In the illustrated embodiment, the noise processing module includes multiple programmable switches S1, S2, S3…Sn. The input of the noise in-phase amplifier 36 is connected to the output of the noise follower amplifier 34, used to in-phase amplify the amplified second ambient noise frequency signal into useful noise and output the useful noise (e.g., a monitoring alarm sound). The input of the programmable switch is connected to the output of either the noise in-phase amplifier 35 or the noise in-phase amplifier 36, and the output of the programmable switch is connected to the input of the inverting adder 33. In its default state, the input of the programmable switch is connected to the output of the noise in-phase amplifier 35; it is only connected to the output of the noise in-phase amplifier 36 when the second ambient noise frequency signal is detected.

[0036] like Figure 2 As shown, in one exemplary embodiment, the noise processing module may be provided with a second adjustable resistor R1 connected in parallel with the noise in-phase amplifier 36. The second adjustable resistor R1 is used to adjust the amplification amplitude of the noise frequency signal to ensure that the amplitude of the noise frequency signal after adjustment matches the amplitude of the signal with the same frequency in the target sound source.

[0037] Furthermore, such as Figure 3 As shown, the target sound pickup device 20 may include a radiation-proof housing 21 and a target sound pickup 22. The radiation-proof housing 21 is a hollow shell to form a sound cavity 23, and is provided with at least one labyrinth 24. One end of each labyrinth 24 is connected to a sound guide tube 25, and the other end is connected to the sound cavity 23. The target sound pickup 22 is disposed inside the sound cavity 23. Since the target sound pickup 22 inside the sound cavity collects sound through the guide tube connected to the sound cavity, the target sound pickup does not need to be installed and fixed in the position closest to the patient's speaking position. In this way, on the one hand, even if the medical device moves or the patient's position changes, it will not affect the collection of the patient's voice; on the other hand, it avoids the pickup being directly exposed to radiation, thereby significantly improving the pickup's service life or anti-interference capability.

[0038] In one embodiment, for example, the radiation shielding housing 21 may be made of a radiation-shielding material (e.g., heavy metal) to prevent radiation from damaging the target sound pickup. Optionally, the radiation shielding housing 21 may also be provided with a sound-insulating layer (e.g., sound-absorbing sponge) covering the outer surface of the radiation shielding housing to isolate other noise signals transmitted by vibration, thereby reducing the difficulty of signal processing.

[0039] In one example, the sound guide 25 has a bent tube shape, such as Figure 3As shown in the diagram. Because the sound guide tube 25 is curved and the target sound pickup 22 is located inside the sound cavity 23, the radiation emitted by the medical device will not reach the target sound pickup 22, thereby further preventing damage to the target sound pickup and improving its service life. In one embodiment, the outer wall of the sound guide tube 25 is wrapped with sound-insulating material, such as sound-insulating cotton. In another embodiment, the sound guide tube 25 can be a curved flexible tube.

[0040] In an alternative embodiment, the maze 24 may be angled through the radiation shielding housing 21, such as... Figure 3 As shown. Furthermore, as described above and Figure 3 The target sound pickup device 20 shown is merely an exemplary structure and is not intended to limit the invention thereto. For example, the radiation shielding housing may be provided with multiple labyrinths separated from each other, each labyrinth connecting to a sound guide tube. These multiple labyrinths may be formed separately within the radiation shielding housing. This structure with multiple sound guide tubes can simultaneously acquire other useful sound sources that need to be retained (e.g., alarm sounds) in addition to the patient's voice, thus expanding the pickup area and placing the sound guide tubes within the desired audio pickup area, thereby improving sound pickup effect and accuracy.

[0041] On the other hand, the noise reduction and sound pickup method according to the present invention will be described in detail below. The noise reduction and sound pickup method includes: acquiring ambient noise emitted by a corresponding noise source 40 through at least one noise pickup 10 and generating an ambient noise frequency signal; acquiring a target sound from a target sound source through a target sound pickup device 20 and generating a target sound frequency signal; and inverting and amplifying at least a portion of the frequency signal in the ambient noise frequency signal, superimposing the inverted and amplified ambient noise frequency signal with the target sound frequency signal to obtain a useful sound, and outputting the useful sound.

[0042] In one embodiment, the ambient noise frequency signal can be a real-time signal. Further, in one embodiment, the step of inverting and amplifying at least a portion of the ambient noise frequency signal and superimposing the amplified ambient noise frequency signal with the target audio frequency signal includes: in-phase amplification of the ambient noise frequency signal and the target audio frequency signal; controlling the delay of the amplified ambient noise frequency signal to keep the ambient noise frequency signal synchronized with the target audio frequency signal; flipping the phase of the at least a portion of the ambient noise frequency signal and amplifying the amplitude of the at least a portion of the ambient noise frequency signal, and amplifying the amplitude of the target audio frequency signal to match the amplitude of the target audio frequency signal; and superimposing the at least a portion of the ambient noise frequency signal and the target audio frequency signal to remove signals in the target audio frequency signal that have the same frequency as the at least a portion of the ambient noise frequency signal to obtain the useful sound.

[0043] Further, optionally, after delaying the amplified ambient noise frequency signal to synchronize it with the target audio frequency signal, the noise reduction pickup method further includes determining whether the frequency of the ambient noise frequency signal is within a first preset frequency range or a second preset frequency range. When the ambient noise frequency signal is determined to be within the first preset frequency range, it is amplified in reverse phase and superimposed on the target audio frequency signal; when the ambient noise frequency signal is determined to be within the second preset frequency range, it is amplified in phase and output. The first preset frequency range and the second preset frequency range are different, and are preset by specifying the frequencies of noise to be eliminated and the frequencies of noise to be retained. Therefore, all relevant noise frequency signals contained in the ambient noise frequency signal are eliminated, leaving only the required sound signals, such as the patient's voice and some detected key equipment operation indication sounds.

[0044] The above description is merely an embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will understand that any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and principle of the present invention should be included within the scope of protection of the present invention.

Claims

1. A noise reduction sound pickup device, comprising: at least one noise pickup device, which is arranged close to a corresponding noise source, is adapted to collect environmental noise emitted by the noise source and generate an environmental noise frequency signal; a target sound pickup device, which is arranged close to a target sound source, is adapted to collect target sound emitted by the target sound source and generate a target sound frequency signal; and a sound signal processing unit, which inverts and amplifies at least part of the environmental noise frequency signal, superimposes the inverted and amplified environmental noise frequency signal and the target sound frequency signal amplified in phase at the same input end of an inverting adder to obtain useful sound, and outputs the useful sound, wherein: the environmental noise frequency signal comprises a first environmental noise frequency signal and a second environmental noise frequency signal, and the first environmental noise frequency signal is the environmental noise frequency signal inverted and amplified by the sound signal processing unit; the sound signal processing unit comprises at least one noise processing module, which comprises: a noise follow-up amplifier, which amplifies the received environmental noise frequency signal in phase; a signal delay module, an input end of which is connected to an output end of the noise follow-up amplifier; a noise inverting amplifier, an input end of which is connected to an output end of the signal delay module; a noise in-phase amplifier, an input end of which is connected to the output end of the noise follow-up amplifier, and which is adapted to amplify the amplified second environmental noise frequency signal in phase as useful noise; and a program-controlled switch, an input end of which is connected to an output end of the noise inverting amplifier or an output end of the noise in-phase amplifier, and an output end of which is connected to an input end of the inverting adder; the target sound pickup device comprises: a radiation-proof shell, which is a hollow shell to form a sound cavity, and is provided with at least one acoustic labyrinth, one end of each of the at least one acoustic labyrinth being connected to a sound guide pipe and the other end being in communication with the sound cavity, wherein: the sound guide pipe has a bent pipe shape, the at least one acoustic labyrinth is inclined through the radiation-proof shell, the radiation-proof shell is provided with a plurality of acoustic labyrinths and a plurality of sound guide pipes separated from each other; and a target sound pickup device, which is arranged in the sound cavity. The environmental noise frequency signal is a real-time signal.

2. The noise-reducing sound pickup device according to claim 1, wherein The sound signal processing unit comprises a signal delay module, which controls the delay of the environmental noise frequency signal to synchronize the environmental noise frequency signal with the target sound frequency signal.

3. The noise-reducing sound pickup device according to claim 2, wherein The sound signal processing unit comprises:

4. The noise-reducing sound pickup device according to claim 3, wherein the at least one noise processing module, which is arranged close to a corresponding noise pickup device in the at least one noise pickup device; a target sound follow-up amplifier, which amplifies the received target sound frequency signal in phase; a target sound in-phase amplifier, an input end of which is connected to the target sound follow-up amplifier; and a target sound in-phase amplifier, an input end of which is connected to the target sound follow-up amplifier; and The same input end of the inverting adder is connected with the output end of the noise inverting amplifier and the output end of the target tone non-inverting amplifier, and the inverting amplified environmental noise frequency signal and the target tone frequency signal are superimposed.

5. The noise-reducing sound pickup device according to claim 4, wherein The noise processing module is provided with a first adjustable resistor connected in parallel with the noise non-inverting amplifier.

6. The noise-reducing sound pickup device according to claim 5, wherein The signal delay module comprises an adjustable capacitor and a fixed resistor, and the adjustable capacitor and the fixed resistor are connected in series between the output end of the noise following amplifier and the input end of the noise inverting amplifier.

7. The noise-reducing sound pickup device according to claim 1, wherein The noise processing module is provided with a second adjustable resistor connected in parallel with the noise non-inverting amplifier.

8. The noise-reducing sound pickup device according to claim 1, wherein, The radiation-proof shell is further provided with a sound insulation layer covering the outer surface of the radiation-proof shell.

9. The noise-reducing sound pickup device of claim 1, wherein, The output end of the sound signal processing unit is connected to a loudspeaker.

10. A noise reduction sound pickup method, comprising: collecting environmental noise corresponding to a noise source by at least one noise pickup device and generating an environmental noise frequency signal; collecting target sound from a target sound source by a target sound pickup device and generating a target tone frequency signal; and inverting amplifying at least part of the frequency signals in the environmental noise frequency signal, superimposing the inverting amplified environmental noise frequency signal and the inverting amplified target tone frequency signal at the same input end of an inverting adder to obtain useful sound, and outputting the useful sound; controlling the connection of the environmental noise frequency signal to a noise non-inverting amplifier for non-inverting amplification of the environmental noise frequency signal or to a noise inverting amplifier for inverting amplification of the environmental noise frequency signal by a program-controlled switch; the target sound pickup device comprises: a radiation-proof shell, which is a hollow shell to form a sound cavity, and is provided with at least one labyrinth, one end of each of the at least one labyrinth being connected to a sound guide pipe and the other end being in communication with the sound cavity, the sound guide pipe having a bent pipe shape, the at least one labyrinth being inclined through the radiation-proof shell, the radiation-proof shell being provided with a plurality of labyrinths and a plurality of corresponding sound guide pipes separated from each other; and a target sound pickup device, which is arranged in the sound cavity.

11. The noise-reducing sound pickup method according to claim 10, wherein The environmental noise frequency signal is a real-time signal.

12. The noise-reducing sound pickup method according to claim 11, wherein The inverting amplifying at least part of the frequency signals in the environmental noise frequency signal and superimposing the inverting amplified environmental noise frequency signal and the non-inverting amplified target tone frequency signal at the same input end of an inverting adder comprises: non-inverting amplifying the environmental noise frequency signal and the target tone frequency signal; controlling the delay of the amplified environmental noise frequency signal to keep the environmental noise frequency signal and the target tone frequency signal in synchronization; inverting the phase of the at least part of the frequency signals and amplifying the amplitude of the at least part of the frequency signals, and amplifying the amplitude of the target tone frequency signal to match the amplitude of the at least part of the frequency signals; and superimposing the at least part of the frequency signals and the target tone frequency signal to remove the signals in the target tone frequency signal with the same frequency as the at least part of the frequency signals to obtain the useful sound.

13. The noise-reducing sound pickup method according to claim 12, wherein After the delay of the amplified ambient noise frequency signal is controlled to keep the ambient noise frequency signal synchronized with the target audio frequency signal, the noise reduction pickup method further comprises: judging whether the frequency of the ambient noise frequency signal is within a first preset frequency range or a second preset frequency range; and when it is judged that the ambient noise frequency signal is within the first preset frequency range, the ambient noise frequency signal is amplified in reverse phase and superimposed with the target audio frequency signal; or when it is judged that the ambient noise frequency signal is within the second preset frequency range, the ambient noise frequency signal is amplified in phase and outputted.

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