WO2012000404A1 - Method and device for suppressing fan noise - Google Patents

Method and device for suppressing fan noise Download PDF

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Publication number
WO2012000404A1
WO2012000404A1 PCT/CN2011/076254 CN2011076254W WO2012000404A1 WO 2012000404 A1 WO2012000404 A1 WO 2012000404A1 CN 2011076254 W CN2011076254 W CN 2011076254W WO 2012000404 A1 WO2012000404 A1 WO 2012000404A1
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WIPO (PCT)
Prior art keywords
fan
speed
noise
processor
fan speed
Prior art date
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PCT/CN2011/076254
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French (fr)
Chinese (zh)
Inventor
刘佩峰
Original Assignee
中兴通讯股份有限公司
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Publication of WO2012000404A1 publication Critical patent/WO2012000404A1/en

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Classifications

    • 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
    • G10K11/1781—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 characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
    • G10K11/17821—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 characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the input signals only
    • G10K11/17823—Reference signals, e.g. ambient acoustic environment
    • 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
    • G10K11/1787—General system configurations
    • G10K11/17873—General system configurations using a reference signal without an error signal, e.g. pure feedforward
    • 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
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/10—Applications
    • G10K2210/109—Compressors, e.g. fans
    • 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
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/10—Applications
    • G10K2210/11—Computers, i.e. ANC of the noise created by cooling fan, hard drive or the like
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
    • G10L21/0208—Noise filtering

Definitions

  • the content of the present invention relates to the field of wireless communication technologies, and mainly relates to a method and apparatus for suppressing fan noise.
  • the noise index is particularly important in the above application environment. Due to the placement of system products and residential areas, too much noise will affect the lives of nearby residents, attracting complaints and increasing the maintenance cost of operators. At present, the noise value of system products is increasingly becoming a concern of customers. The noise is highly valued and even used as a weapon against the opponent.
  • the noise of the system products mainly comes from the fan of heat dissipation. When the fan runs at full speed, the noise value can reach 60 ⁇ 80 decibels, which is harmful to the human body.
  • system products use different methods to suppress or eliminate fan noise. For example, a sound-absorbing material is added to the air inlet and the air outlet, which is generally a sponge. This method is not conducive to the heat dissipation of the system products, reducing the life of the product. There are also fans with large air vents and low obstructions, which increases the cost of the system products and reduces the competitiveness of the products.
  • the technical problem to be solved by the present invention is to provide a method and device for suppressing fan noise, which improves product life and competitiveness.
  • the present invention provides a method for suppressing fan noise, including: Obtaining a fan speed, generating a control signal according to the fan speed to the sounding module, and driving the sounding module to generate a fan noise suppression signal at the fan speed.
  • the method further comprises
  • Pre-storing a lookup table wherein the lookup table stores phase information of the fan speed and fan noise generated at the fan speed, or phase and amplitude information;
  • the step of generating a control signal includes: after acquiring the fan speed, searching the lookup table, and generating the control signal according to the found phase information, or phase and amplitude information.
  • the method further comprises
  • the suppression signal generated by the sounding module is inverted with the fan noise.
  • the method further comprises
  • the suppression signal generated by the sounding module is equal to the fan noise.
  • the method further comprises
  • the fan is controlled by a processor, and the processor further receives actual speed information fed back by the fan;
  • the obtaining the fan speed includes: the processor acquiring the fan speed according to the actual speed information fed back by the fan.
  • the present invention provides a device for suppressing fan noise, the device comprising a processor and a sounding module, wherein:
  • the processor is configured to: obtain a fan speed, generate a control signal according to the fan speed to the sounding module, to drive the sounding module to generate a suppression signal of fan noise inversion at the fan speed;
  • the sounding module is configured to: generate a suppression signal of the fan noise at the fan speed according to the control signal.
  • the processor is further configured to: prestore a lookup table, where the lookup table stores phase information of the fan speed and fan noise generated at the fan speed, or phase and amplitude information; the processor is configured to After obtaining the fan speed, searching the lookup table to obtain phase information of the fan noise generated by the fan speed, or phase and amplitude information, according to the The phase information of the fan noise, or phase and amplitude information, produces the control signal.
  • a lookup table stores phase information of the fan speed and fan noise generated at the fan speed, or phase and amplitude information
  • the processor is configured to After obtaining the fan speed, searching the lookup table to obtain phase information of the fan noise generated by the fan speed, or phase and amplitude information, according to the The phase information of the fan noise, or phase and amplitude information, produces the control signal.
  • the suppression signal is equal in amplitude to the fan noise.
  • the suppression signal is inverted from the fan noise.
  • the processor is further configured to: control a rotation speed of the fan, and receive actual rotation speed information fed back by the fan;
  • the processor is configured to: obtain the fan rotational speed according to actual rotational speed information fed back by the fan.
  • the noise suppression method proposed by the invention suppresses the fan noise by generating the inverse noise, has the advantages of low cost and convenient implementation; and, by the preset lookup table, the device for capturing the sensing is omitted, and the cost is saved;
  • the invention can directly utilize the existing hardware resources of the system, does not need to add expensive equipment, saves hardware expenses, and improves product performance and competitiveness.
  • the invention is simple and convenient to use, and can be applied to a communication system product such as a BBU, and can also be used for other products that require noise suppression.
  • the present invention does not limit this.
  • FIG. 1 is a schematic diagram showing the hardware composition of the device of the present invention.
  • FIG. 2 is a schematic diagram of a software processing flow of the present invention. Preferred embodiment of the invention
  • the basic idea of the invention is that the rotational speed of the fan is known to be a certain value, and the environmental conditions of the system product at each rotational speed are also well known.
  • the fan noise phase information in each determined combination is stored in a lookup table, and the processor outputs an inverted control signal to drive the sounding module (for example, a speaker) to emit noise opposite to the fan noise to cancel the fan noise. , so as to achieve the purpose of suppressing and eliminating fan noise.
  • the invention provides a device for suppressing noise of a fan, comprising: a processor and a sounding module, wherein the processor is connected to the sounding module, wherein: The processor is configured to: obtain a fan speed, generate a control signal to the sounding module according to the fan speed, to drive the sounding module to generate a fan noise suppression signal at the fan speed; and the sounding module is configured to: The control signal produces a suppression signal for fan noise at the fan speed.
  • the processor is further configured to: prestore a lookup table, where the lookup table stores phase information of the fan speed and fan noise generated by the fan speed, or phase information and amplitude information; after the processor acquires the fan speed, The lookup table is searched for, and the control signal is generated based on the found phase information, or phase and amplitude information.
  • This lookup table can be pre-programmed in the ROM of the processor. Of course, it is also possible to obtain a correlation signal of the fan noise in real time without storing a lookup table, and generate a suppression signal.
  • the suppression signal is inverted from the fan noise equal amplitude, and of course, may be other suppression signals that have a phase or amplitude and can suppress the fan noise.
  • the suppression signal is inversely inverted from the fan noise.
  • the processor is further configured to: determine whether the fan speed exceeds a preset threshold before generating the control signal according to the fan speed, and if yes, generate the control signal to the sounding module.
  • the processor is further configured to: determine whether the fan speed exceeds a preset threshold before generating a control signal according to the fan speed, and if yes, generate the control signal to the sounding module.
  • the sound module can include a D/A converter, an amplifier and a speaker, wherein:
  • the processor outputs a speaker control signal that is inverting the amplitude of the current fan noise, is converted by the D/A converter and amplified by the amplifier, and then output to the speaker, which drives the speaker to emit sound, the noise generated by the fan and the reverse sound wave emitted by the speaker. It can eliminate each other and effectively reduce noise.
  • the processor further controls the rotation speed of the fan, and receives the actual rotation speed information fed back by the fan; the processor acquires the fan rotation speed according to the actual rotation speed information fed back by the fan.
  • the processor can output a PWM signal to control the speed of the fan via D/A conversion, and the actual fan speed value is A/D converted and fed back to the processor to adjust the speed of the fan in real time.
  • the processor can obtain the current fan speed from the fan speed signal fed back by the fan.
  • a specific implementation of the fan noise suppression device of the present invention includes: 101, D / A (digital / analog signal) converter 102, drive amplifier 103 (implemented by a simple triode), speaker 104 (can be implemented using a small speaker), system product cooling fan 105, analog / digital signal converter 106 And a digital/analog signal converter 107.
  • the processor 101, the D/A (digital/analog signal) converter 102, the drive amplifier 103, the A/D (analog/digital signal converter) 106, and the D/A converter 107 can all be used in the system products.
  • Device implementation the D/A (digital/analog signal) converter 102, the drive amplifier 103, the A/D (analog/digital signal converter) 106, and the D/A converter 107 can all be used in the system products.
  • Device implementation the D/A (digital/analog signal) converter 102, the drive amplifier 103, the A/D (analog/digital signal converter
  • the fan speed value is given by the processor and is driven by the D/A converter 107 to drive the fan.
  • the environmental noise information of the system product fan at a certain number of revolutions is stored in a lookup table of the processor, and the noise information includes phase information of the fan noise, or phase information and amplitude information.
  • the fan feeds back the fan speed feedback signal to the processor 101 via the A/D converter 106.
  • the processor 101 obtains the current fan speed according to the fan speed feedback signal, and searches the pre-stored lookup table according to the current fan speed.
  • the processor outputs a corresponding one according to the search result.
  • the inverted control signal after being amplified by the D/A converter 102 and the drive amplifier 103, drives the speaker 104 to emit noise of equal amplitude inversion. According to the acoustic principle, the amplitude of the original noise can be reduced or offset to achieve the purpose of suppressing and eliminating fan noise of the system product.
  • the invention also provides a fan noise suppression method, comprising:
  • a lookup table may be pre-stored, wherein the lookup table stores phase information of the fan speed and fan noise generated by the fan speed, or phase and amplitude information; after obtaining the fan speed, searching the lookup table, according to the search The phase information, or phase and amplitude information, is generated to generate the control signal.
  • the suppression signal is inverted from the fan noise equal amplitude, and of course, may be other suppression signals that have a phase or amplitude and can suppress the fan noise.
  • the suppression signal is inversely inverted from the fan noise.
  • the processor is further configured to: control a rotation speed of the fan, and receive actual rotation speed information fed back by the fan; and the processor acquires the fan rotation speed according to the actual rotation speed information fed back by the fan.
  • FIG. 2 it is a flowchart of a fan noise suppression method according to the present invention, including:
  • Step 201 Acquire a fan speed according to a fan speed feedback signal.
  • Step 202 Find a preset lookup table according to the fan speed.
  • Step 203 it is determined whether the corresponding information is found; if yes, step 204 is performed, otherwise, step 205 is performed;
  • Step 204 Output an inverted control signal to the speaker according to the search result; perform step 205; Step 205, print the information, and print the current processing result: noise suppression has been performed or noise suppression is not successful, and the process ends.
  • the invention can utilize the existing hardware resources of the system product, and does not need to add expensive equipment, which greatly saves the hardware expenditure and improves the performance and competitiveness of the product.
  • the noise suppression method proposed by the invention suppresses the fan noise by generating the inverse noise, has the advantages of low cost and convenient implementation; and, by the preset lookup table, the device for capturing the sensing is omitted, and the cost is saved;
  • the invention can directly utilize the existing hardware resources of the system, does not need to add expensive equipment, saves hardware expenses, and improves product performance and competitiveness.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Control Of Positive-Displacement Air Blowers (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Abstract

A method for suppressing a fan noise is provided, which includes: acquiring a fan speed, generating a control signal to a sound module according to the fan speed, and driving the sound module to generate a suppression signal of the fan noise at the fan speed. A device for suppressing a fan noise is also provided, which comprises a processor and a sound module. The processor acquires the fan speed and generates the control signal to the sound module according to the fan speed. According to the control signal, the sound module generates the suppression signal of the fan noise at the fan speed.

Description

一种风扇噪音的抑制方法和装置  Method and device for suppressing fan noise
技术领域 Technical field
本发明的内容涉及到无线通信技术领域， 主要涉及一种风扇噪音的抑制 方法和装置。  The content of the present invention relates to the field of wireless communication technologies, and mainly relates to a method and apparatus for suppressing fan noise.
背景技术 Background technique
随着移动通讯网络系统产品体积的不断缩小， 运营商不在需要为基站设 备搭建专门的基站机房， 而趋于在现有建筑中摆放系统设备。 特别在人口稠 密的居住区， 运营商通常在住宅小区的高层租用一套民居作为机房使用。 运 营商一般都会在机房中釆用环境告警监控措施， 比如机房红外、 温度、 湿度、 噪音、 水淹、 烟雾、 门禁、 干节点等监控， 对这些环境变量进行监控， 利于 基站的维护， 利于基站安全稳定的运行。  As the volume of mobile communication network systems continues to shrink, operators do not need to build dedicated base station rooms for base station equipment, and tend to place system equipment in existing buildings. Especially in densely populated residential areas, operators usually rent a residential building as a computer room at the upper level of a residential community. Operators generally use environmental alarm monitoring measures in the equipment room, such as infrared, temperature, humidity, noise, flooding, smoke, access control, and dry nodes in the equipment room. These environmental variables are monitored to facilitate the maintenance of the base station and facilitate the base station. Safe and stable operation.
其中噪音指标在上述的应用环境中显得尤为重要。 由于系统产品放置与 居住区， 噪音太大会影响到附近居民的生活， 引来投诉， 增加运营商的维护 成本， 目前系统产品的噪声值越来越成为客户关注的方面， 各厂家也对系统 产品的噪声给予高度重视， 甚至以此作为打击对手的利器。  Among them, the noise index is particularly important in the above application environment. Due to the placement of system products and residential areas, too much noise will affect the lives of nearby residents, attracting complaints and increasing the maintenance cost of operators. At present, the noise value of system products is increasingly becoming a concern of customers. The noise is highly valued and even used as a weapon against the opponent.
系统产品的噪音主要来源于散热的风扇， 当风扇全速运行时， 噪音值可 达 60~80分贝， 属于对人体有害的范围。 目前系统产品都釆用了不同的方式 来抑制或消除风扇噪音， 例如在进风口和出风口加入消音材料， 一般是海绵。 这种方式不利于系统产品的散热， 降低了产品的寿命。 还有釆用大风口和低 阻碍的风扇， 这种方式增加了系统产品的成本， 降低了产品的竟争力。  The noise of the system products mainly comes from the fan of heat dissipation. When the fan runs at full speed, the noise value can reach 60~80 decibels, which is harmful to the human body. At present, system products use different methods to suppress or eliminate fan noise. For example, a sound-absorbing material is added to the air inlet and the air outlet, which is generally a sponge. This method is not conducive to the heat dissipation of the system products, reducing the life of the product. There are also fans with large air vents and low obstructions, which increases the cost of the system products and reduces the competitiveness of the products.
发明内容 Summary of the invention
本发明要解决的技术问题是提供一种风扇噪音的抑制方法和装置， 提高 产品寿命和竟争力。 为了解决上述问题， 本发明提供了一种风扇噪音的抑制方法， 包括： 获取风扇转速， 根据所述风扇转速产生控制信号至发声模块， 驱动所述 发声模块产生所述风扇转速下的风扇噪音的抑制信号。 The technical problem to be solved by the present invention is to provide a method and device for suppressing fan noise, which improves product life and competitiveness. In order to solve the above problems, the present invention provides a method for suppressing fan noise, including: Obtaining a fan speed, generating a control signal according to the fan speed to the sounding module, and driving the sounding module to generate a fan noise suppression signal at the fan speed.
优选地， 所述方法还包括，  Preferably, the method further comprises
预存一查找表， 所述查找表中存储风扇转速及该风扇转速下产生的风扇 噪音的相位信息， 或者相位和幅度信息；  Pre-storing a lookup table, wherein the lookup table stores phase information of the fan speed and fan noise generated at the fan speed, or phase and amplitude information;
所述产生控制信号的步骤包括： 获取所述风扇转速后， 查找所述查找表， 根据查找到的相位信息， 或者相位和幅度信息产生所述控制信号。  The step of generating a control signal includes: after acquiring the fan speed, searching the lookup table, and generating the control signal according to the found phase information, or phase and amplitude information.
优选地， 所述方法还包括，  Preferably, the method further comprises
所述发声模块产生的所述抑制信号与所述风扇噪音反相。  The suppression signal generated by the sounding module is inverted with the fan noise.
优选地， 所述方法还包括，  Preferably, the method further comprises
所述发声模块产生的所述抑制信号与所述风扇噪音等幅。  The suppression signal generated by the sounding module is equal to the fan noise.
优选地， 所述方法还包括，  Preferably, the method further comprises
所述风扇由一处理器控制转速， 所述处理器还接收所述风扇反馈的实际 转速信息；  The fan is controlled by a processor, and the processor further receives actual speed information fed back by the fan;
所述获取风扇转速包括： 所述处理器根据所述风扇反馈的实际转速信息 获取所述风扇转速。  The obtaining the fan speed includes: the processor acquiring the fan speed according to the actual speed information fed back by the fan.
本发明提供一种风扇噪音的抑制装置，所述装置包括处理器和发声模块， 其中：  The present invention provides a device for suppressing fan noise, the device comprising a processor and a sounding module, wherein:
所述处理器设置为： 获取风扇转速， 根据所述风扇转速产生控制信号至 发声模块， 以驱动所述发声模块产生所述风扇转速下的风扇噪音反相的抑制 信号；  The processor is configured to: obtain a fan speed, generate a control signal according to the fan speed to the sounding module, to drive the sounding module to generate a suppression signal of fan noise inversion at the fan speed;
所述发声模块设置为： 根据所述控制信号产生所述风扇转速下的风扇噪 音的抑制信号。  The sounding module is configured to: generate a suppression signal of the fan noise at the fan speed according to the control signal.
优选地， 所述处理器还设置为： 预存一查找表， 所述查找表中存储风扇 转速及该风扇转速下产生的风扇噪音的相位信息， 或者相位和幅度信息； 所述处理器是设置为： 获取所述风扇转速后， 查找所述查找表， 获取所 述风扇转速下产生的风扇噪音的相位信息， 或者相位和幅度信息， 根据所述 风扇噪音的相位信息， 或者相位和幅度信息， 产生所述控制信号。 Preferably, the processor is further configured to: prestore a lookup table, where the lookup table stores phase information of the fan speed and fan noise generated at the fan speed, or phase and amplitude information; the processor is configured to After obtaining the fan speed, searching the lookup table to obtain phase information of the fan noise generated by the fan speed, or phase and amplitude information, according to the The phase information of the fan noise, or phase and amplitude information, produces the control signal.
优选地， 所述抑制信号与所述风扇噪音等幅。  Preferably, the suppression signal is equal in amplitude to the fan noise.
优选地， 所述抑制信号与所述风扇噪音反相。  Preferably, the suppression signal is inverted from the fan noise.
优选地， 所述处理器还设置为： 控制所述风扇的转速， 并接收所述风扇 反馈的实际转速信息；  Preferably, the processor is further configured to: control a rotation speed of the fan, and receive actual rotation speed information fed back by the fan;
所述处理器是设置为： 根据所述风扇反馈的实际转速信息获取所述风扇 转速。  The processor is configured to: obtain the fan rotational speed according to actual rotational speed information fed back by the fan.
与现有技术相比较， 有以下的优点：  Compared with the prior art, it has the following advantages:
本发明提出的噪声抑制方法， 通过产生反相噪声抑制风扇噪音， 具有成 本低、 实现方便的有点； 并且， 通过预置查找表， 省去了捕获传感的器件， 节约了成本； 另外， 本发明可直接利用系统现有硬件资源， 不需要外加昂贵 的设备， 节省了硬件开支， 提高了产品性能和竟争力。  The noise suppression method proposed by the invention suppresses the fan noise by generating the inverse noise, has the advantages of low cost and convenient implementation; and, by the preset lookup table, the device for capturing the sensing is omitted, and the cost is saved; The invention can directly utilize the existing hardware resources of the system, does not need to add expensive equipment, saves hardware expenses, and improves product performance and competitiveness.
本发明使用简单方便， 可以适用于 BBU等通信系统产品， 也可用于其他 需要进行噪声抑制的产品， 本发明对此不作限定。 附图概述  The invention is simple and convenient to use, and can be applied to a communication system product such as a BBU, and can also be used for other products that require noise suppression. The present invention does not limit this. BRIEF abstract
图 1是本发明的装置硬件组成示意图；  1 is a schematic diagram showing the hardware composition of the device of the present invention;
图 2 是本发明软件处理流程示意图。 本发明的较佳实施方式  2 is a schematic diagram of a software processing flow of the present invention. Preferred embodiment of the invention
本发明的基本思想是： 风扇的转速是有可知确定的值的， 每种转速下的 系统产品环境情况也是确定可知的。 将每个确定的组合情况下的风扇噪音相 位信息存入一个查找表， 由处理器对应输出一个反相的控制信号驱动发声模 块（比如， 扬声器）发出与风扇噪音反相的噪声以抵消风扇噪音， 从而达到 抑制和消除风扇噪声的目的。  The basic idea of the invention is that the rotational speed of the fan is known to be a certain value, and the environmental conditions of the system product at each rotational speed are also well known. The fan noise phase information in each determined combination is stored in a lookup table, and the processor outputs an inverted control signal to drive the sounding module (for example, a speaker) to emit noise opposite to the fan noise to cancel the fan noise. , so as to achieve the purpose of suppressing and eliminating fan noise.
本发明提供一种风扇噪音的抑制装置， 包括： 处理器和发声模块， 处理 器与发声模块相连， 其中： 所述处理器用于： 获取风扇转速， 根据所述风扇转速产生控制信号至发 声模块， 以驱动所述发声模块产生所述风扇转速下的风扇噪音的抑制信号； 所述发声模块用于： 根据所述控制信号产生所述风扇转速下的风扇噪音 的抑制信号。 The invention provides a device for suppressing noise of a fan, comprising: a processor and a sounding module, wherein the processor is connected to the sounding module, wherein: The processor is configured to: obtain a fan speed, generate a control signal to the sounding module according to the fan speed, to drive the sounding module to generate a fan noise suppression signal at the fan speed; and the sounding module is configured to: The control signal produces a suppression signal for fan noise at the fan speed.
所述处理器还用于： 预存一查找表， 所述查找表中存储风扇转速及该风 扇转速下产生的风扇噪音的相位信息、 或者相位信息和幅度信息； 处理器获 取所述风扇转速后， 查找所述查找表， 根据查找到的相位信息、 或者相位和 幅度信息， 产生所述控制信号。 该查找表可预先烧录在处理器的 ROM 中。 当然， 也可以不存储查找表， 实时获取风扇噪音的相关信息， 产生抑制信号。  The processor is further configured to: prestore a lookup table, where the lookup table stores phase information of the fan speed and fan noise generated by the fan speed, or phase information and amplitude information; after the processor acquires the fan speed, The lookup table is searched for, and the control signal is generated based on the found phase information, or phase and amplitude information. This lookup table can be pre-programmed in the ROM of the processor. Of course, it is also possible to obtain a correlation signal of the fan noise in real time without storing a lookup table, and generate a suppression signal.
所述抑制信号与所述风扇噪音等幅反相， 当然， 也可是其他相位或幅度 且能对风扇噪音产生抑制作用的抑制信号。 优选地， 抑制信号与风扇噪音等 幅反相。  The suppression signal is inverted from the fan noise equal amplitude, and of course, may be other suppression signals that have a phase or amplitude and can suppress the fan noise. Preferably, the suppression signal is inversely inverted from the fan noise.
所述处理器还用于： 根据所述风扇转速产生控制信号前， 判断所述风扇 转速是否超过预设阔值， 如果超过， 才产生所述控制信号至所述发声模块。  The processor is further configured to: determine whether the fan speed exceeds a preset threshold before generating the control signal according to the fan speed, and if yes, generate the control signal to the sounding module.
其中， 所述处理器还用于： 根据所述风扇转速产生控制信号前， 判断所 述风扇转速是否超过预设阔值， 如果超过， 才产生所述控制信号至所述发声 模块。  The processor is further configured to: determine whether the fan speed exceeds a preset threshold before generating a control signal according to the fan speed, and if yes, generate the control signal to the sounding module.
其中， 发声模块可包括 D/A转换器、 放大器和扬声器， 其中：  Wherein, the sound module can include a D/A converter, an amplifier and a speaker, wherein:
由处理器输出一个与当前风扇噪音等幅反相的扬声器控制信号， 经 D/A 转换器转换和放大器放大后， 输出至扬声器， 驱动扬声器发声， 风扇产生的 噪音声波与扬声器发出的反向声波可相互 4氏消， 有效地降低噪音。  The processor outputs a speaker control signal that is inverting the amplitude of the current fan noise, is converted by the D/A converter and amplified by the amplifier, and then output to the speaker, which drives the speaker to emit sound, the noise generated by the fan and the reverse sound wave emitted by the speaker. It can eliminate each other and effectively reduce noise.
其中， 所述处理器还控制所述风扇的转速， 并接收所述风扇反馈的实际 转速信息；所述处理器根据所述风扇反馈的实际转速信息获取所述风扇转速。 具体地， 处理器可输出 PWM信号经由 D/A转换控制风扇的转速， 同时实际 的风扇转速值经 A/D转换后反馈回处理器， 以实时调整风扇的转速。 处理器 通过风扇反馈的风扇转速信号可以获得当前的风扇转速。  The processor further controls the rotation speed of the fan, and receives the actual rotation speed information fed back by the fan; the processor acquires the fan rotation speed according to the actual rotation speed information fed back by the fan. Specifically, the processor can output a PWM signal to control the speed of the fan via D/A conversion, and the actual fan speed value is A/D converted and fed back to the processor to adjust the speed of the fan in real time. The processor can obtain the current fan speed from the fan speed signal fed back by the fan.
如图 1所示， 为本发明风扇噪音抑制装置的一具体实现， 包括： 处理器 101、 D/A (数字 /模拟信号）转换器 102、 驱动放大器 103 (可用简单三极管 实现） 、 扬声器 104 (可使用普通小喇叭实现） 、 系统产品的散热风扇 105、 模拟 /数字信号转换器 106和数字 /模拟信号转换器 107。 其中， 处理器 101、 D/A (数字 /模拟信号）转换器 102、 驱动放大器 103、 A/D (模拟 /数字信号转 换器） 106和 D/A转换器 107均可釆用系统产品现有器件实现。 As shown in FIG. 1 , a specific implementation of the fan noise suppression device of the present invention includes: 101, D / A (digital / analog signal) converter 102, drive amplifier 103 (implemented by a simple triode), speaker 104 (can be implemented using a small speaker), system product cooling fan 105, analog / digital signal converter 106 And a digital/analog signal converter 107. Among them, the processor 101, the D/A (digital/analog signal) converter 102, the drive amplifier 103, the A/D (analog/digital signal converter) 106, and the D/A converter 107 can all be used in the system products. Device implementation.
见图 1所示， 风扇的转速值是由处理器给出的， 经由 D/A转换器 107转 换后驱动风扇运转。 把若干转速下的系统产品风扇环境噪音信息存入处理器 的一个查找表， 噪音信息包括风扇噪音的相位信息， 或者相位信息和幅度信 息。  As shown in Figure 1, the fan speed value is given by the processor and is driven by the D/A converter 107 to drive the fan. The environmental noise information of the system product fan at a certain number of revolutions is stored in a lookup table of the processor, and the noise information includes phase information of the fan noise, or phase information and amplitude information.
风扇经 A/D转换器 106反馈风扇转速反馈信号至处理器 101 ,处理器 101 根据该风扇转速反馈信号获取当前风扇转速， 根据当前风扇转速查找预存的 查找表， 处理器根据查找结果对应输出一个反相的控制信号， 经 D/A转换器 102和驱动放大器 103放大后， 驱动扬声器 104发出等幅反相的噪声。 根据 声学原理， 可以降低或抵消原有噪声的幅值， 从而达到抑制和消除系统产品 风扇噪声的目的。  The fan feeds back the fan speed feedback signal to the processor 101 via the A/D converter 106. The processor 101 obtains the current fan speed according to the fan speed feedback signal, and searches the pre-stored lookup table according to the current fan speed. The processor outputs a corresponding one according to the search result. The inverted control signal, after being amplified by the D/A converter 102 and the drive amplifier 103, drives the speaker 104 to emit noise of equal amplitude inversion. According to the acoustic principle, the amplitude of the original noise can be reduced or offset to achieve the purpose of suppressing and eliminating fan noise of the system product.
本发明还提供一种风扇噪音抑制方法， 包括： The invention also provides a fan noise suppression method, comprising:
获取风扇转速， 根据所述风扇转速产生控制信号至发声模块， 驱动所述 发声模块产生所述风扇转速下的风扇噪音的抑制信号。  Obtaining a fan speed, generating a control signal according to the fan speed to the sounding module, and driving the sounding module to generate a fan noise suppression signal at the fan speed.
其中， 可预存一查找表， 所述查找表中存储风扇转速及该风扇转速下产 生的风扇噪音的相位信息， 或者相位和幅度信息； 获取所述风扇转速后， 查 找所述查找表， 根据查找到的相位信息， 或者相位和幅度信息， 产生所述控 制信号。  A lookup table may be pre-stored, wherein the lookup table stores phase information of the fan speed and fan noise generated by the fan speed, or phase and amplitude information; after obtaining the fan speed, searching the lookup table, according to the search The phase information, or phase and amplitude information, is generated to generate the control signal.
所述抑制信号与所述风扇噪音等幅反相， 当然， 也可是其他相位或幅度 且能对风扇噪音产生抑制作用的抑制信号。 优选地， 抑制信号与风扇噪音等 幅反相。  The suppression signal is inverted from the fan noise equal amplitude, and of course, may be other suppression signals that have a phase or amplitude and can suppress the fan noise. Preferably, the suppression signal is inversely inverted from the fan noise.
其中， 根据所述风扇转速产生控制信号前， 还判断所述风扇转速是否超 过预设阔值， 如果超过， 才产生所述控制信号至所述发声模块。 所述处理器还用于： 控制所述风扇的转速， 并接收所述风扇反馈的实际 转速信息； 所述处理器是根据所述风扇反馈的实际转速信息获取所述风扇转 速。 Before the control signal is generated according to the fan speed, it is further determined whether the fan speed exceeds a preset threshold, and if so, the control signal is generated to the sounding module. The processor is further configured to: control a rotation speed of the fan, and receive actual rotation speed information fed back by the fan; and the processor acquires the fan rotation speed according to the actual rotation speed information fed back by the fan.
如图 2所示， 为本发明风扇噪音抑制方法流程图， 包括：  As shown in FIG. 2, it is a flowchart of a fan noise suppression method according to the present invention, including:
步骤 201 , 根据风扇转速反馈信号， 获取风扇转速；  Step 201: Acquire a fan speed according to a fan speed feedback signal.
步骤 202 , 根据风扇转速查找预置的查找表；  Step 202: Find a preset lookup table according to the fan speed.
步骤 203 , 判断是否查找到对应的信息； 如果有， 执行步骤 204, 否则， 执行步骤 205;  Step 203, it is determined whether the corresponding information is found; if yes, step 204 is performed, otherwise, step 205 is performed;
步骤 204, 根据查找结果输出反相控制信号至扬声器； 执行步骤 205; 步骤 205 , 打印信息， 打印当前处理结果： 已进行噪声抑制或者未成功 进行噪声抑制， 结束流程。  Step 204: Output an inverted control signal to the speaker according to the search result; perform step 205; Step 205, print the information, and print the current processing result: noise suppression has been performed or noise suppression is not successful, and the process ends.
本发明可釆用系统产品现有硬件资源， 不需要外加昂贵的设备， 这就大 大的节省了硬件开支， 提高了产品的性能和竟争力。  The invention can utilize the existing hardware resources of the system product, and does not need to add expensive equipment, which greatly saves the hardware expenditure and improves the performance and competitiveness of the product.
本领域普通技术人员可以理解上述方法中的全部或部分步骤可通过程序 来指令相关硬件完成， 所述程序可以存储于计算机可读存储介质中， 如只读 存储器、 磁盘或光盘等。 可选地， 上述实施例的全部或部分步骤也可以使用 一个或多个集成电路来实现。 相应地， 上述实施例中的各模块 /单元可以釆用 硬件的形式实现， 也可以釆用软件功能模块的形式实现。 本发明不限制于任 何特定形式的硬件和软件的结合。  One of ordinary skill in the art will appreciate that all or a portion of the above steps may be accomplished by a program instructing the associated hardware, such as a read-only memory, a magnetic disk, or an optical disk. Alternatively, all or part of the steps of the above embodiments may also be implemented using one or more integrated circuits. Correspondingly, each module/unit in the above embodiment may be implemented in the form of hardware or in the form of a software function module. The invention is not limited to any specific form of combination of hardware and software.
工业实用性 Industrial applicability
本发明提出的噪声抑制方法， 通过产生反相噪声抑制风扇噪音， 具有成 本低、 实现方便的有点； 并且， 通过预置查找表， 省去了捕获传感的器件， 节约了成本； 另外， 本发明可直接利用系统现有硬件资源， 不需要外加昂贵 的设备， 节省了硬件开支， 提高了产品性能和竟争力。  The noise suppression method proposed by the invention suppresses the fan noise by generating the inverse noise, has the advantages of low cost and convenient implementation; and, by the preset lookup table, the device for capturing the sensing is omitted, and the cost is saved; The invention can directly utilize the existing hardware resources of the system, does not need to add expensive equipment, saves hardware expenses, and improves product performance and competitiveness.

Claims

权 利 要 求 书 Claim
1、 一种风扇噪音的抑制方法， 包括：  1. A method for suppressing fan noise, comprising:
获取风扇转速， 根据所述风扇转速产生控制信号至发声模块， 驱动所述 发声模块产生所述风扇转速下的风扇噪音的抑制信号。  Obtaining a fan speed, generating a control signal according to the fan speed to the sounding module, and driving the sounding module to generate a fan noise suppression signal at the fan speed.
2、 如权利要求 1所述的方法， 其中， 所述方法还包括，  2. The method of claim 1, wherein the method further comprises
预存一查找表， 所述查找表中存储风扇转速及该风扇转速下产生的风扇 噪音的相位信息， 或者相位和幅度信息；  Pre-storing a lookup table, wherein the lookup table stores phase information of the fan speed and fan noise generated at the fan speed, or phase and amplitude information;
所述产生控制信号的步骤包括： 获取所述风扇转速后， 查找所述查找表， 根据查找到的相位信息， 或者相位和幅度信息， 产生所述控制信号。  The step of generating a control signal includes: after acquiring the fan speed, searching the lookup table, and generating the control signal according to the found phase information, or phase and amplitude information.
3、 如权利要求 1或 2所述的方法， 其中，  3. The method according to claim 1 or 2, wherein
所述发声模块产生的所述抑制信号与所述风扇噪音反相。  The suppression signal generated by the sounding module is inverted with the fan noise.
4、 如权利要求 1或 2所述的方法， 其中，  4. The method according to claim 1 or 2, wherein
所述发声模块产生的所述抑制信号与所述风扇噪音等幅。  The suppression signal generated by the sounding module is equal to the fan noise.
5、 如权利要求 1或 2所述的方法， 其中，  5. The method according to claim 1 or 2, wherein
所述风扇由一处理器控制转速， 所述处理器还接收所述风扇反馈的实际 转速信息；  The fan is controlled by a processor, and the processor further receives actual speed information fed back by the fan;
所述获取风扇转速包括： 所述处理器根据所述风扇反馈的实际转速信息 获取所述风扇转速。  The obtaining the fan speed includes: the processor acquiring the fan speed according to the actual speed information fed back by the fan.
6、 一种风扇噪音的抑制装置， 所述装置包括处理器和发声模块， 其中： 所述处理器设置为： 获取风扇转速， 根据所述风扇转速产生控制信号至 发声模块， 以驱动所述发声模块产生所述风扇转速下的风扇噪音反相的抑制 信号；  6. A device for suppressing fan noise, the device comprising a processor and a sounding module, wherein: the processor is configured to: obtain a fan speed, generate a control signal according to the fan speed to a sounding module, to drive the sounding The module generates a suppression signal of fan noise inversion at the fan speed;
所述发声模块设置为： 根据所述控制信号产生所述风扇转速下的风扇噪 音的抑制信号。  The sounding module is configured to: generate a suppression signal of the fan noise at the fan speed according to the control signal.
7、 如权利要求 6所述的装置， 其中，  7. The apparatus according to claim 6, wherein
所述处理器还设置为： 预存一查找表， 所述查找表中存储风扇转速及该 风扇转速下产生的风扇噪音的相位信息， 或者相位和幅度信息； 所述处理器是设置为： 获取所述风扇转速后， 查找所述查找表， 获取所 述风扇转速下产生的风扇噪音的相位信息， 或者相位和幅度信息， 根据所述 风扇噪音的相位信息， 或者相位和幅度信息， 产生所述控制信号。 The processor is further configured to: pre-store a lookup table, store the fan speed in the lookup table, and the The phase information of the fan noise generated at the fan speed, or the phase and amplitude information; the processor is configured to: after obtaining the fan speed, look up the lookup table to obtain the phase of the fan noise generated by the fan speed The information, or phase and amplitude information, is generated based on phase information of the fan noise, or phase and amplitude information.
8、 如权利要求 6或 7所述的装置， 其中，  8. The apparatus according to claim 6 or 7, wherein
所述抑制信号与所述风扇噪音等幅。  The suppression signal is equal in amplitude to the fan noise.
9、 如权利要求 6或 7所述的装置， 其中，  9. The apparatus according to claim 6 or 7, wherein
所述抑制信号与所述风扇噪音反相。  The suppression signal is inverted from the fan noise.
10、 如权利要求 6或 7所述的装置， 其中，  10. The apparatus according to claim 6 or 7, wherein
所述处理器还设置为： 控制所述风扇的转速， 并接收所述风扇反馈的实 际转速信息；  The processor is further configured to: control a rotational speed of the fan, and receive actual rotational speed information fed back by the fan;
所述处理器是设置为： 根据所述风扇反馈的实际转速信息获取所述风扇 转速。  The processor is configured to: obtain the fan rotational speed according to actual rotational speed information fed back by the fan.
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