Noise reduction method and device for electrical equipment and electrical equipment

Abstract

The invention relates to the technical field of environmental noise reduction, and discloses a noise reduction method and device for electrical equipment and the electrical equipment, and the method comprises the steps: obtaining the environmental sound information in an external space where the electrical equipment is located; analyzing the environment sound information, and determining an original sound wave signal corresponding to noise information in the environment sound information; and generating an anti-phase sound wave signal according to the original sound wave signal, thereby enabling the electrical equipment to play the target sound information according to the anti-phase sound wave signal, and eliminating the noise information in the external space. Noise information, including working noise and water flow sound in a bathroom where the bath heater works, in the external space can be eliminated through the sound wave reverse phase counteracting technology, and a quiet washing environment is provided for a user.

Description

Technical Field

[0001] This invention relates to the field of environmental noise reduction technology, specifically to a noise reduction method, device, and electrical equipment for electrical devices. Background Technology

[0002] Currently, most bathroom heaters on the market achieve their heating function through heating modules (such as PTC heaters or light bulbs). However, during use, bathroom heaters generate mechanical noise and airflow noise, and this continuous noise negatively impacts the user's bathing experience. In addition, the water noise generated by the water flow during showering can also affect the voice control recognition of smart bathroom heaters, interfering with the user experience.

[0003] Due to the noise source characteristics and installation environment constraints of bathroom heaters, noise reduction methods used in fields such as headphones or automobiles are not suitable for the noise reduction environment of bathroom heaters. Currently, bathroom heater technology typically focuses only on heating efficiency and safety, lacking effective means of noise control. Although some bathroom heater products use sound-insulating materials or structural designs to reduce noise, these methods are often limited in effectiveness and cannot be dynamically optimized for noise sources in different scenarios. Summary of the Invention

[0004] This invention provides a method, device, and electrical equipment for noise reduction in electrical appliances, in order to solve the problem of noise reduction in bathroom heaters.

[0005] In a first aspect, the present invention provides a noise reduction method for electrical appliances, the method comprising: acquiring ambient sound information in the external space where the electrical appliance is located; analyzing the ambient sound information to determine the original sound wave signal corresponding to the noise information in the ambient sound information; generating an anti-phase sound wave signal based on the original sound wave signal, so that the electrical appliance plays target sound information based on the anti-phase sound wave signal to eliminate the noise information in the external space.

[0006] The noise reduction method for electrical appliances provided by this invention analyzes the ambient sound information in the external space where the electrical appliance is located, determines the original sound wave signal corresponding to the noise information in the ambient sound information, and generates an inverse sound wave signal based on the original sound wave signal, so that the electrical appliance can play the target sound information according to the inverse sound wave signal. It can use sound wave inversion cancellation technology to eliminate noise information in the external space, including the working noise and water flow noise in the bathroom when the bathroom heater is working, providing users with a quieter washing environment.

[0007] In one optional implementation, before analyzing the ambient sound information and determining the original sound wave signal corresponding to the noise information in the ambient sound information, the method further includes: determining whether the electrical device emits entertainment sound information; if the electrical device emits entertainment sound information, then acquiring the entertainment sound information, calculating the difference between the ambient sound information and the entertainment sound information, and updating the ambient sound information to the difference.

[0008] This invention obtains the original entertainment sound information and removes the entertainment sound information from the environmental sound information, thus ensuring that the entertainment sound is not reduced or destroyed when noise is eliminated, thereby improving the user's entertainment experience.

[0009] In one optional implementation, analyzing the ambient sound information to determine the original sound wave signal corresponding to the noise information in the ambient sound information includes: acquiring local sound information within a preset time interval before the current time in the ambient sound information; filtering the local sound information based on filtering coefficients to obtain the original sound wave signal; adjusting the filtering coefficients according to the original sound wave signal, and taking the next time moment as the current time moment, returning to the step of acquiring the local sound information within a preset time interval before the current time in the ambient sound information.

[0010] This invention filters local sound information within a preset time interval prior to the current moment through iterative filtering, enabling iterative adjustment of the filtering coefficients to ensure adaptive adjustment of noise reduction and guarantee a good noise reduction effect.

[0011] In one alternative implementation, after generating an antiphase sound wave signal based on the original sound wave signal and playing the target sound information based on the antiphase sound wave signal, the method further includes: obtaining the spatial volume of the external space; adjusting the volume of the target sound information based on the spatial volume, wherein the spatial volume is inversely proportional to the volume.

[0012] This invention adjusts the volume of the target sound information according to the volume of the external space, and can automatically adjust the noise reduction power in different spatial scenarios to maintain a good noise reduction effect and avoid the noise reduction effect being affected by the volume of the external space.

[0013] In one alternative implementation, after generating an inverted sound wave signal based on the original sound wave signal and playing the target sound information based on the inverted sound wave signal, the method further includes: acquiring the spatial temperature of the external space; adjusting the volume of the target sound information based on the spatial temperature, wherein the spatial temperature is inversely proportional to the volume.

[0014] This invention adjusts the volume of the target sound information based on the temperature of the external space, and can automatically adjust the noise reduction power in different temperature scenarios to maintain a good noise reduction effect and avoid the noise reduction effect being affected by the temperature of the external space.

[0015] Secondly, the present invention provides a noise reduction device for electrical appliances, the device comprising: a sound acquisition module for acquiring environmental sound information in the external space where the electrical appliance is located; a noise identification module for analyzing the environmental sound information and determining the original sound wave signal corresponding to the noise information in the environmental sound information; and a noise cancellation module for generating an anti-phase sound wave signal based on the original sound wave signal, so that the electrical appliance plays the target sound information based on the anti-phase sound wave signal and cancels the noise information in the external space.

[0016] Thirdly, the present invention provides an electrical device, comprising: a control module and a noise reduction module, wherein the control module is connected to the noise reduction module; the control module comprises: a memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the computer instructions to perform the noise reduction method of the electrical device described in the first aspect or any corresponding embodiment; the noise reduction module is used to collect environmental sound information in the external space where the electrical device is located and send it to the control module, and play target sound information according to the anti-phase sound wave signal sent by the control module.

[0017] Since the noise reduction methods of electrical equipment are used to reduce noise in the external space, they have the same effect as the noise reduction methods of electrical equipment, and will not be elaborated here.

[0018] In one alternative implementation, the electrical appliance is a bathroom heater.

[0019] This invention reduces noise in the bathroom where the bathroom heater is located, eliminating the operating noise of the bathroom heater and the sound of the shower running water, providing users with a quieter washing environment and improving their washing experience.

[0020] In one optional implementation, the noise reduction module includes a microphone array and a speaker array; the microphone array is used to collect ambient sound information in the external space where the electrical device is located; the speaker array is used to play target sound information according to the anti-phase sound wave signal.

[0021] This invention, by installing a microphone array and a speaker array on a bathroom heater, can collect ambient sounds in the bathroom from all directions and play the sound information corresponding to the reverse sound wave signal from all directions, thereby eliminating noise in the bathroom and creating a quieter washing space for users.

[0022] In one optional implementation, the bathroom heater further includes: a heating module for operating at a preset temperature to raise the temperature in the external space; a fan module for operating at a preset wind speed to circulate air in the external space; and an entertainment module for generating entertainment sound information, which is then played by the sound playback module.

[0023] This invention, by installing a heating module and a fan module inside the bathroom heater, can quickly raise the temperature in the bathroom, providing users with a comfortable washing environment. Simultaneously, installing an entertainment module within the bathroom heater integrates audio playback functionality, eliminating the need for users to bring mobile phones or other devices into the bathroom, thus reducing the risk of damage to these devices. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of an electrical device in an application scenario according to an embodiment of the present invention; Figure 2 This is a schematic flowchart of a first method for noise reduction of electrical equipment according to an embodiment of the present invention; Figure 3 This is a schematic diagram of a second process for a noise reduction method for electrical equipment according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the third process of a noise reduction method for electrical equipment according to an embodiment of the present invention; Figure 5 This is a schematic diagram of a noise wave signal of a noise reduction method for an electrical device according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the anti-phase acoustic wave signal of a noise reduction method for electrical equipment according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the residual noise wave signal of a noise reduction method for electrical equipment according to an embodiment of the present invention. Figure 8 This is a structural block diagram of a noise reduction device for electrical equipment according to an embodiment of the present invention; Figure 9 This is a schematic diagram of the hardware structure of the control module of the electrical device according to an embodiment of the present invention. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] It is understood that before using the technical solutions disclosed in the various embodiments of the present invention, users should be informed of the types, scope of use, and usage scenarios of the personal information involved in the present invention and their authorization should be obtained in accordance with relevant laws and regulations through appropriate means.

[0028] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0029] As an optional application scenario of this invention, such as Figure 1 As shown, this embodiment of the invention provides an electrical device 100, such as a bathroom heater lamp. The electrical device includes a control module 101 and a noise reduction module 102. The noise reduction module 102 collects ambient sound information from the external space where the electrical device 100 is located and sends it to the control module 101. The control module 101 generates an anti-phase sound wave signal based on the ambient sound information and sends it to the noise reduction module 102. The noise reduction module 102 then plays target sound information based on the anti-phase sound wave signal. The target sound information cancels out the sound waves in the ambient sound information, thereby eliminating noise in the external space where the electrical device 100 is located.

[0030] like Figure 1 As shown, the noise reduction module 102 includes a microphone array 1021 and a speaker array 1022. The microphone array 1021 is used to collect ambient sound information in the external space where the electrical equipment is located, and the speaker array 1022 is used to play target sound information according to the anti-phase sound wave signal.

[0031] like Figure 1 As shown, taking a bathroom heater as an example, the electrical device also includes: a heating module 103, used to operate at a preset temperature to raise the temperature in the external space; a fan module 104, used to operate at a preset wind speed to circulate air in the external space; and an entertainment module 105, used to generate entertainment sound information, which is then played by the sound playback module.

[0032] According to an embodiment of the present invention, a method for noise reduction of an electrical device is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0033] This embodiment provides a noise reduction method for electrical appliances, such as bathroom heaters, which eliminates noise in the external space by playing sound information corresponding to inverted sound wave signals. Figure 2 This is a flowchart of a noise reduction method for electrical equipment according to an embodiment of the present invention, such as... Figure 2 As shown, the process includes the following steps: Step S201: Obtain ambient sound information of the external space where the electrical equipment is located.

[0034] Specifically, in this embodiment of the invention, taking a bathroom heater as an example, the bathroom heater is equipped with a heating module and a fan module to realize its heating function. The heating module is used to operate at a preset temperature to raise the temperature in the external space, and the fan module is used to operate at a preset wind speed to circulate the air in the external space. The two work together to raise the temperature in the bathroom quickly and provide users with a comfortable washing environment.

[0035] In some optional implementations, the bathroom heater generates mechanical noise during operation, especially from the fan module which vibrates and generates noise due to airflow. Additionally, the shower generates noise from the water jets. Furthermore, since the bathroom is typically an enclosed space during washing, the combined effect of these various sounds can lead to significant noise levels, severely impacting the user's washing experience. Therefore, to effectively reduce bathroom noise, this embodiment of the invention uses a microphone array attached to the bathroom heater to collect ambient sound information from the external space (i.e., the bathroom) where the heater is located. And send it to the control module. At this time, ambient sound information The ambient sound information in the bathroom includes at least the noise of the bathroom heater and the sound of water flowing. If the user is accustomed to playing entertainment sounds, such as music or videos, during the washing process, the ambient sound information will also include entertainment sounds.

[0036] Step S202: Analyze the environmental sound information to determine the original sound wave signal corresponding to the noise information in the environmental sound information.

[0037] Specifically, in this embodiment of the invention, blindly reducing the noise of ambient sound information could lead to the misprocessing of useful sounds (such as music played by the user or conversations between family members). Therefore, the control module needs to properly process the ambient sound information. The system targets and eliminates unwanted noise while retaining useful sounds (entertainment sounds, conversations, etc.) generated by the user. The control module analyzes the ambient sound information, which contains all sound information in the bathroom, and uses filtering and other algorithms to extract the original sound wave signals corresponding to the noise from the ambient sound information, thereby achieving subsequent active noise reduction.

[0038] In some optional implementations, the frequency ranges of the sound waves corresponding to different sounds in the environmental sound information are different. For example, the operating noise of a bathroom heater is generally 200Hz~1500Hz, mainly low-frequency, and is a periodic and stable signal, such as the sound of a motor rotating or a fan blowing air. Moreover, it varies with the heater's setting; for example, "high heating" has a higher frequency and greater intensity than "low heating." The sound of water flowing is generally 500Hz~3000Hz, with the frequency varying with the water flow rate. It is a non-periodic random signal, such as the sound of shower water hitting tiles or water flowing while washing hands. Furthermore, changes in water flow rate and impact angle cause real-time fluctuations in frequency and intensity; for example, the noise frequency of "shower mode" is more dispersed than "columnar water flow." Entertainment sounds are generally 20Hz~20000Hz, covering the entire frequency band, such as music and video voices, and have the characteristics of "regularity and identifiability." Therefore, this embodiment of the invention analyzes environmental sound information, identifies different types of sounds, and then determines the original sound wave signal corresponding to the noise information in the environmental sound information.

[0039] Step S203: Generate an inverted sound wave signal based on the original sound wave signal, so that the electrical equipment can play the target sound information according to the inverted sound wave signal and eliminate noise information in the external space.

[0040] Specifically, in this embodiment of the invention, because sound is essentially a vibrational wave of air molecules, it possesses three core attributes: frequency, amplitude, and phase. When two sound waves have the same frequency, equal amplitude, and a phase difference of 180° (out of phase), the two sound waves will undergo "destructive interference" in the air. That is, the peak of one sound wave completely overlaps with the trough of the other sound wave, and the vibrational energy cancels each other out, ultimately resulting in a significant reduction in the sound intensity perceived by the human ear. Based on this principle, when the control module identifies ambient sound information... After obtaining the original acoustic signal corresponding to the noise information in the signal, the corresponding inverted acoustic signal is generated. The inverted acoustic signal Send to the speaker array, and the speaker array responds according to the anti-phase acoustic wave signal. After the target sound information is played, the original sound wave signal of the noise in the bathroom and the anti-phase sound wave signal undergo destructive interference, thereby eliminating the noise information in the bathroom.

[0041] For example, if a 500Hz, 55dB noise wave (the original sound wave) generated by a bathroom heater motor is superimposed with an anti-phase sound wave of 500Hz, 55dB, and 180° phase difference, the 500Hz noise will be canceled out, leaving only a faint residual background sound. In practice, it's crucial to ensure the anti-phase sound wave and the original noise wave are synchronized and precisely matched in real-time. If the frequency deviation is greater than 5%, the amplitude deviation is greater than 10dB, or the phase delay is greater than 20ms, not only will noise reduction be ineffective, but additional noise may also accumulate. Furthermore, to avoid excessive quietness after cancellation, which could cause discomfort due to the enclosed space of the bathroom, a 25dB-30dB low-frequency white noise, such as gentle water flow or fan noise, can be superimposed. White noise has a uniform frequency distribution, won't conflict with the anti-phase sound wave, and can mask any remaining noise that wasn't completely canceled out, such as the faint vibration of the bathroom heater motor, further enhancing comfort.

[0042] The noise reduction method for electrical appliances provided by this invention analyzes the ambient sound information in the external space where the electrical appliance is located, determines the original sound wave signal corresponding to the noise information in the ambient sound information, and generates an inverse sound wave signal based on the original sound wave signal, so that the electrical appliance can play the target sound information according to the inverse sound wave signal. It can use sound wave inversion cancellation technology to eliminate noise information in the external space, including the working noise and water flow noise in the bathroom when the bathroom heater is working, providing users with a quieter washing environment.

[0043] This embodiment provides a noise reduction method for electrical appliances, which can be used in the aforementioned electrical appliances, such as bathroom heaters. Figure 3 This is a flowchart of a noise reduction method for electrical equipment according to an embodiment of the present invention, such as... Figure 3 As shown, the process includes the following steps: Step S301: Obtain ambient sound information of the external space where the electrical equipment is located. For details, please refer to [link to relevant documentation]. Figure 1 Step S201 of the illustrated embodiment will not be described again here.

[0044] Step S302: Determine whether the electrical device emits entertainment sound information; if the electrical device emits entertainment sound information, acquire the entertainment sound information, calculate the difference between the ambient sound information and the entertainment sound information, and update the ambient sound information to the difference.

[0045] Specifically, in this embodiment of the invention, taking a bathroom heater as an example, if the bathroom heater is equipped with an entertainment module, the user can connect a mobile terminal such as a mobile phone to the bathroom heater. The controller of the bathroom heater can acquire entertainment sounds and send them to the speaker array for playback, or the bathroom heater can directly play locally stored entertainment sounds, or the bathroom heater can connect to the internet to play entertainment sounds from the cloud. In this scenario, the audio data of the entertainment sounds is played by the bathroom heater, meaning that the control module of the bathroom heater can obtain the original data source corresponding to the entertainment sounds. To ensure that the entertainment sounds are not affected when noise is eliminated, if the bathroom heater determines that it is emitting entertainment sound information, i.e., the entertainment module is activated, it acquires the original entertainment sound information from the system. And calculate ambient sound information Entertainment audio information The difference, and the environmental sound information Updated to .

[0046] In some alternative implementations, if the bathroom heater or other electrical appliances are equipped with voice control, it is necessary to avoid interfering with human voices during the noise cancellation process. Therefore, it is necessary to distinguish between entertainment sound information and human voices, preserve the user's voice, ensure that the user has a quieter environment during the shower, and at the same time, make the voice control more sensitive and improve the reliability of intelligent voice recognition.

[0047] Step S303: Analyze the environmental sound information to determine the original sound wave signal corresponding to the noise information in the environmental sound information.

[0048] Specifically, step S303 includes: Step S3031: Obtain local sound information within a preset time interval before the current moment from the ambient sound information.

[0049] Specifically, in this embodiment of the invention, in order to ensure that noise cancellation maintains its optimal effect, adaptive noise cancellation is required for the environmental sound information. Therefore, after acquiring the environmental sound information according to a preset sampling frequency, local sound information within a preset time interval between the current moments is... As a processing target, such as in the processing of ambient sound information Updated to Since the sound information is a discrete signal, the most recent M frequency signals are taken as the local sound information. and local sound information The target for processing is M frequency signals, which need to completely cover the characteristic period of the current noise and be able to respond quickly to noise changes. For example, M is set to 64, which is only an example and not a limitation.

[0050] Step S3032: Filter the local sound information based on the filtering coefficients to obtain the original sound wave signal.

[0051] Specifically, in this embodiment of the invention, an adaptive filter is used to process local sound information. Processing is performed, and the adaptive filter is based on the filter coefficients. Local sound information Filtering is performed to preserve the original sound wave signal corresponding to the noise information, while filtering out useful sounds and background interference. The filter coefficients... The noise reduction weights for different frequency components represent the cancellation strategies for each frequency.

[0052] Step S3033: Adjust the filtering coefficients according to the original sound wave signal, and take the next moment as the current moment, returning to the step of obtaining the local sound information within the preset time interval before the current moment in the environmental sound information.

[0053] Specifically, in this embodiment of the invention, because the frequency and amplitude of bathroom noise change in real time, a fixed filtering coefficient is used. Retaining only 200-1500Hz is not suitable for all scenarios (for example, the sound of flowing water may extend to 3000Hz). Therefore, during the noise cancellation process, the filter coefficients need to be adjusted according to the filtering effect. Real-time adjustments are made, that is, the filter coefficients are adjusted based on the original acoustic signal obtained from the filtering process. Adjustments are made. This includes calculating the filter coefficients. With local sound information The dot product yields the antiphase acoustic signal. Based on local sound information and anti-phase acoustic signal Update filter coefficients The corresponding formula is shown below:

[0054]

[0055] in, As a compensation factor, it controls the filter coefficients. The update magnitude should be adjusted to avoid oscillations caused by excessively rapid adjustments, or noise reduction delays caused by adjustments that are too slow. For example... The value is 0.001.

[0056] Acquire environmental sound information in the next moment And in the presence of entertainment sound information At that time, ambient sound information Updated to Take the most recent M frequency signals as local sound information Using the filter coefficients updated in the previous time step After filtering, a new anti-phase acoustic signal is obtained. By executing the cycle repeatedly, the internal system of the bathroom heater can adjust parameters according to the sound characteristics and continuously optimize the filtering effect, thereby obtaining the inverted sound wave signal at each moment. Ultimately, by canceling out the noise source with the inverted sound waves, the sound wave audible to the human ear can be obtained, ensuring that noise cancellation in the bathroom remains at its optimal effect. For example, a low-frequency sine wave with a frequency of 50 Hz and an amplitude of 0.5, and a high-frequency sine wave with a frequency of 1000 Hz and an amplitude of 0.3, are added to a random waveform as ambient sound information. The original sound wave signal corresponding to the noise is as follows: Figure 4 As shown, the obtained antiphase acoustic signal is as follows: Figure 5 As shown, the sound wave signal that ultimately reaches the human ear in the bathroom. like Figure 6 As shown, sound wave signal The correspondence between the signals and the audio signals is as follows:

[0057] Step S304: Generate an inverted sound wave signal based on the original sound wave signal, so that the electrical device can play the target sound information according to the inverted sound wave signal, thereby eliminating noise information in the external space. For details, please refer to... Figure 1 Step S203 of the illustrated embodiment will not be described again here.

[0058] The noise reduction method for electrical appliances provided by this invention analyzes the ambient sound information in the external space where the electrical appliance is located, determines the original sound wave signal corresponding to the noise information in the ambient sound information, and generates an inverse sound wave signal based on the original sound wave signal, so that the electrical appliance can play the target sound information according to the inverse sound wave signal. It can use sound wave inversion cancellation technology to eliminate noise information in the external space, including the working noise and water flow noise in the bathroom when the bathroom heater is working, providing users with a quieter washing environment.

[0059] This embodiment provides a noise reduction method for electrical appliances, which can be used in the aforementioned electrical appliances, such as bathroom heaters. Figure 7 This is a flowchart of a noise reduction method for electrical equipment according to an embodiment of the present invention, such as... Figure 7 As shown, the process includes the following steps: Step S701: Obtain ambient sound information of the external space where the electrical equipment is located. For details, please refer to [link to relevant documentation]. Figure 3 Step S301 of the illustrated embodiment will not be described again here.

[0060] Step S702: Analyze the ambient sound information to determine the original sound wave signal corresponding to the noise information in the ambient sound information. For details, please refer to [link to relevant documentation]. Figure 3 Step S303 of the illustrated embodiment will not be described again here.

[0061] Step S703: Generate an inverted sound wave signal based on the original sound wave signal, so that the electrical device can play the target sound information according to the inverted sound wave signal, thereby eliminating noise information in the external space. For details, please refer to... Figure 3 Step S304 of the illustrated embodiment will not be described again here.

[0062] Step S704: Obtain the volume of the external space; adjust the volume of the target sound information according to the volume of the space, where the volume of the space is inversely proportional to the volume.

[0063] Specifically, in this embodiment of the invention, the external space where the electrical device is located differs from the relatively narrow spaces of headphones or cars. Taking a bathroom heater as an example, the heater is installed in a bathroom, which has a certain space. Sound in a bathroom naturally attenuates, and the larger the space, the more severe the attenuation. Therefore, if the same volume is used to play the target sound information in different space volumes, there may be insufficient or excessive cancellation. Therefore, this embodiment of the invention adjusts the volume of the target sound information according to the space volume of the bathroom, wherein the space volume and volume are inversely proportional, that is, the larger the bathroom, the lower the volume, and the smaller the bathroom, the higher the volume.

[0064] In some optional implementations, embodiments of the present invention can use a bathroom heater to emit a detection sound wave signal of a specific frequency. After receiving the reflected detection sound wave signal, the approximate size of the space can be calculated by calculating the round-trip time difference of the sound wave and combining it with the known speed of sound. Alternatively, the user can actively set the size of the space through the bathroom heater's accompanying APP.

[0065] In some alternative implementations, in large bathrooms, due to the long sound wave propagation distance, the output power of the speakers can be appropriately reduced to lower the volume corresponding to the target sound information. This avoids excessive cancellation of the reverse sound waves due to excessively strong sound waves, which could affect the noise reduction effect or cause sound distortion. Simultaneously, to ensure comprehensive acquisition of ambient noise, the coverage area can be increased by adding more microphone arrays, enhancing the ability to capture noise from different areas and improving the adaptability of the noise reduction system.

[0066] In some alternative implementations, in small bathroom spaces, due to the shorter sound wave propagation path, the system can increase the speaker output power to increase the volume corresponding to the target sound information, enhance the cancellation capability of reverse sound waves, and more effectively eliminate echoes and reverberation. Simultaneously, to prevent signal interference between multiple microphones, the number of operating microphones can be reduced, optimizing signal processing efficiency.

[0067] For example, due to the limited space in the bathroom, this embodiment of the invention uses 15 square meters as a base. For every 5 square meters increase, the speaker output power decreases by 3dB, and for every 5 square meters decrease, the speaker output power increases by 3dB. This is only an example and is not intended to be limiting.

[0068] Step S705: Obtain the ambient temperature of the external space; adjust the volume of the target sound information according to the ambient temperature, as the ambient temperature and volume are inversely proportional.

[0069] Specifically, in this embodiment of the invention, taking a bathroom heater as an example, the function of the bathroom heater is to raise the temperature inside the bathroom, and changes in temperature affect the propagation of sound. Generally speaking, in low-temperature environments, the air density is higher, and the speed of sound propagation is slower; for example, at 0°C, the speed of sound is approximately 331 meters per second. In high-temperature environments, the air density is lower, and the speed of sound propagation is faster; for example, at 30°C, the speed of sound is approximately 349 meters per second. To further ensure the noise reduction effect, a temperature detection device can be installed on the bathroom heater, and during the noise reduction process, the ambient temperature inside the bathroom can be acquired in real time. The output power of the speaker can be dynamically adjusted according to the current ambient temperature to adjust the volume of the target sound signal.

[0070] In some optional embodiments, embodiments of the present invention appropriately increase the speaker power in low-temperature environments to compensate for the weakened cancellation effect caused by the increased sound velocity; in high-temperature environments, the speaker power is appropriately reduced to avoid overcompensation caused by the decreased sound velocity. For example, the sound velocity v = 331.5 + 0.6 × T, and the bathroom temperature T is generally between 0 and 40 degrees Celsius, so the sound velocity is approximately between 331 and 355 meters per second. Taking 25 degrees Celsius as the ambient temperature baseline, for every 5 degrees Celsius increase, the speaker output power decreases by 3 dB; for every 5 degrees Celsius decrease, the speaker output power increases by 3 dB. As heating devices such as bathroom heaters are turned on, the indoor temperature gradually rises; therefore, the temperature change is sensed in real time, and the noise reduction parameters are dynamically adjusted according to the temperature. The adaptive adjustment mechanism built upon spatial volume and temperature not only improves the intelligence level of electrical appliances but also provides users with a more stable and comfortable user experience.

[0071] The noise reduction method for electrical appliances provided by this invention analyzes the ambient sound information in the external space where the electrical appliance is located, determines the original sound wave signal corresponding to the noise information in the ambient sound information, and generates an inverse sound wave signal based on the original sound wave signal, so that the electrical appliance can play the target sound information according to the inverse sound wave signal. It can use sound wave inversion cancellation technology to eliminate noise information in the external space, including the working noise and water flow noise in the bathroom when the bathroom heater is working, providing users with a quieter washing environment.

[0072] This embodiment also provides a noise reduction device for electrical equipment, which is used to implement the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that performs a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0073] This embodiment provides a noise reduction device for electrical equipment, such as... Figure 8 As shown, it includes: The sound acquisition module 801 is used to acquire ambient sound information in the external space where the electrical equipment is located.

[0074] The noise identification module 802 is used to analyze environmental sound information and determine the original sound wave signal corresponding to the noise information in the environmental sound information.

[0075] The noise cancellation module 803 is used to generate an inverted sound wave signal based on the original sound wave signal, so that the electrical equipment can play the target sound information according to the inverted sound wave signal and eliminate noise information in the external space.

[0076] In some alternative embodiments, the apparatus further includes: The sound update module is used to determine whether the electrical device emits entertainment sound information; if the electrical device emits entertainment sound information, the entertainment sound information is obtained, the difference between the ambient sound information and the entertainment sound information is calculated, and the ambient sound information is updated to the difference.

[0077] In some alternative implementations, the noise identification module 802 includes: The sound capture unit is used to acquire local sound information within a preset time interval before the current moment from the ambient sound information.

[0078] The sound filtering unit is used to filter local sound information based on filtering coefficients to obtain the original sound wave signal.

[0079] The coefficient adjustment unit is used to adjust the filter coefficients according to the original sound wave signal, and take the next moment as the current moment, returning to the step of obtaining local sound information within a preset time interval before the current moment in the environmental sound information.

[0080] In some alternative embodiments, the apparatus further includes: The first adjustment module is used to obtain the volume of the external space; the volume of the target sound information is adjusted according to the volume of the space, and the volume of the space is inversely proportional to the volume.

[0081] The second adjustment module is used to obtain the ambient temperature of the external space; and adjust the volume of the target sound information according to the ambient temperature, with the ambient temperature and volume being inversely proportional.

[0082] The noise reduction device for electrical equipment provided in this embodiment of the invention can execute the noise reduction method for electrical equipment provided in any embodiment of the invention, and has the corresponding functional modules and beneficial effects for executing the method. Further functional descriptions of the various modules and units described above are the same as in the corresponding embodiments described above, and will not be repeated here.

[0083] Figure 9 This is a schematic diagram of the structure of a control module in an electrical device provided in an embodiment of the present invention.

[0084] The following is a detailed reference. Figure 9 This diagram illustrates a structural schematic suitable for implementing a control module of an electrical device in an embodiment of the present invention. The control module may include a processor (e.g., a central processing unit, graphics processor, etc.) 901, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 902 or a program loaded from a memory 908 into a random access memory (RAM) 903. The RAM 903 also stores various programs and data required for the operation of the control module. The processor 901, ROM 902, and RAM 903 are interconnected via a bus 904. An input / output (I / O) interface 905 is also connected to the bus 904.

[0085] Typically, the following devices can be connected to I / O interface 905: input devices 906 including, for example, touchscreens, touchpads, keyboards, mice, cameras, microphones, accelerometers, gyroscopes, etc.; output devices 907 including, for example, liquid crystal displays (LCDs), speakers, vibrators, etc.; memory devices 908 including, for example, magnetic tapes, hard disks, etc.; and communication devices 909. Communication device 909 allows the control module to communicate wirelessly or wiredly with other devices to exchange data. Although Figure 9 A control module with various devices is shown, but it should be understood that it is not required to implement or have all of the devices shown, and more or fewer devices may be implemented or have instead.

[0086] In particular, according to embodiments of the present invention, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of the present invention include a computer program product comprising a computer program carried on a non-transitory computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication device 909, or installed from a memory 908, or installed from a ROM 902. When the computer program is executed by the processor 901, it performs the functions defined in the noise reduction method of the electrical device according to embodiments of the present invention.

[0087] Figure 9 The control module shown is merely an example and should not impose any limitations on the functionality and scope of use of the embodiments of the present invention.

[0088] This invention also provides a computer-readable storage medium. The methods described above according to embodiments of the invention can be implemented in hardware or firmware, or implemented as computer code that can be recorded on a storage medium, or implemented as computer code downloaded via a network and originally stored on a remote storage medium or a non-transitory machine-readable storage medium and then stored on a local storage medium. Thus, the methods described herein can be processed by software stored on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. The storage medium can be a magnetic disk, optical disk, read-only memory, random access memory, flash memory, hard disk, or solid-state drive, etc.; further, the storage medium can also include combinations of the above types of memory. It is understood that computers, processors, microprocessor controllers, or programmable hardware include storage components capable of storing or receiving software or computer code. When the software or computer code is accessed and executed by the computer, processor, or hardware, the noise reduction method for the electrical equipment shown in the above embodiments is implemented.

[0089] A portion of this invention can be applied as a computer program product, such as computer program instructions, which, when executed by a computer, can invoke or provide the methods and / or technical solutions according to the invention through the operation of the computer. Those skilled in the art will understand that the forms in which computer program instructions exist in a computer-readable medium include, but are not limited to, source files, executable files, installation package files, etc. Correspondingly, the ways in which computer program instructions are executed by a computer include, but are not limited to: the computer directly executing the instructions, or the computer compiling the instructions and then executing the corresponding compiled program, or the computer reading and executing the instructions, or the computer reading and installing the instructions and then executing the corresponding installed program. Here, the computer-readable medium can be any available computer-readable storage medium or communication medium accessible to a computer.

[0090] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A method of noise reduction for an electrical appliance, characterized in that, The method comprises: acquiring environmental sound information in an external space where an electrical appliance is located; analyzing the environmental sound information to determine original sound wave signals corresponding to noise information in the environmental sound information; generating anti-phase sound wave signals according to the original sound wave signals, so that the electrical appliance plays target sound information according to the anti-phase sound wave signals to eliminate the noise information in the external space.

2. The method of claim 1, wherein, Before analyzing the environmental sound information to determine original sound wave signals corresponding to noise information in the environmental sound information, the method further comprises: determining whether the electrical appliance emits entertainment sound information; if the electrical appliance emits the entertainment sound information, acquiring the entertainment sound information, calculating a difference between the environmental sound information and the entertainment sound information, and updating the environmental sound information as the difference.

3. The method according to claim 1 or 2, characterized in that, The analysis of the environmental sound information to determine original sound wave signals corresponding to noise information in the environmental sound information comprises: acquiring local sound information in a preset time interval before a current time in the environmental sound information; filtering the local sound information based on a filter coefficient to obtain the original sound wave signals; adjusting the filter coefficient according to the original sound wave signals, and taking the next time as the current time, returning to the step of acquiring the local sound information in the preset time interval before the current time in the environmental sound information.

4. The method of claim 1, wherein, After generating anti-phase sound wave signals according to the original sound wave signals and playing target sound information according to the anti-phase sound wave signals, the method further comprises: acquiring a space volume of the external space; adjusting a volume of the target sound information according to the space volume, the space volume being inversely proportional to the volume.

5. The method according to any one of claims 1 or 4, characterized in that, After generating anti-phase sound wave signals according to the original sound wave signals and playing target sound information according to the anti-phase sound wave signals, the method further comprises: acquiring a space temperature of the external space; adjusting a volume of the target sound information according to the space temperature, the space temperature being inversely proportional to the volume.

6. A noise reduction device for an electrical appliance, characterized in that The device comprises: a sound acquisition module for acquiring environmental sound information in an external space where an electrical appliance is located; a noise identification module for analyzing the environmental sound information to determine original sound wave signals corresponding to noise information in the environmental sound information; a noise elimination module for generating anti-phase sound wave signals according to the original sound wave signals, so that the electrical appliance plays target sound information according to the anti-phase sound wave signals to eliminate the noise information in the external space.

7. An electrical appliance characterized by comprises: a control module and a noise reduction module, the control module being connected with the noise reduction module; the control module comprises a memory and a processor, the memory and the processor being communicatively connected with each other, the memory storing computer instructions, and the processor executing the computer instructions to perform the noise reduction method of the electrical appliance according to any one of claims 1 to 5; The noise reduction module is configured to collect environmental sound information in an external space where the electrical appliance is located and send the environmental sound information to the control module, and play target sound information according to the inverted sound wave signal sent by the control module.

8. The electrical appliance of claim 7, wherein, The electrical appliance is a bath heater.

9. The electrical appliance of claim 8, wherein, The noise reduction module includes a microphone array and a speaker array. The microphone array is configured to collect environmental sound information in an external space where the electrical appliance is located. The speaker array is configured to play the target sound information according to the inverted sound wave signal.

10. The appliance of claim 8, wherein, The bath heater further includes: A heating module configured to operate at a preset temperature to increase the temperature in the external space; A fan module configured to operate at a preset wind speed to make air flow in the external space; An entertainment module configured to generate entertainment sound information and play the entertainment sound information by the sound playing module.

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