WO2011137762A2 - 转动装置噪声控制方法及控制器 - Google Patents

转动装置噪声控制方法及控制器 Download PDF

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Publication number
WO2011137762A2
WO2011137762A2 PCT/CN2011/073822 CN2011073822W WO2011137762A2 WO 2011137762 A2 WO2011137762 A2 WO 2011137762A2 CN 2011073822 W CN2011073822 W CN 2011073822W WO 2011137762 A2 WO2011137762 A2 WO 2011137762A2
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Prior art keywords
rotating device
noise
speed information
rotation speed
signal
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PCT/CN2011/073822
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English (en)
French (fr)
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WO2011137762A3 (zh
Inventor
杨成鹏
黎宝生
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华为技术有限公司
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Priority to CN201180000571XA priority Critical patent/CN102216980B/zh
Priority to PCT/CN2011/073822 priority patent/WO2011137762A2/zh
Publication of WO2011137762A2 publication Critical patent/WO2011137762A2/zh
Publication of WO2011137762A3 publication Critical patent/WO2011137762A3/zh
Priority to US13/465,502 priority patent/US20120288112A1/en

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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1781—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
    • G10K11/17813—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 acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms
    • G10K11/17815—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 acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms between the reference signals and the error signals, i.e. primary path
    • 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
    • G10K11/17813—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 acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms
    • G10K11/17817—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 acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms between the output signals and the error signals, i.e. secondary path
    • 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
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1785—Methods, e.g. algorithms; Devices
    • G10K11/17853—Methods, e.g. algorithms; Devices of the filter
    • 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
    • G10K11/17879—General system configurations using both a reference signal and an error signal
    • G10K11/17881—General system configurations using both a reference signal and an error signal the reference signal being an acoustic signal, e.g. recorded with a microphone
    • 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
    • G10K2210/108—Communication systems, e.g. where useful sound is kept and noise is cancelled
    • G10K2210/1082—Microphones, e.g. systems using "virtual" microphones
    • 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
    • G10K2210/121—Rotating machines, e.g. engines, turbines, motors; Periodic or quasi-periodic signals in general
    • 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
    • G10K2210/30—Means
    • G10K2210/301—Computational
    • G10K2210/3033—Information contained in memory, e.g. stored signals or transfer functions
    • 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
    • G10K2210/30—Means
    • G10K2210/301—Computational
    • G10K2210/3048—Pretraining, e.g. to identify transfer functions
    • 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
    • G10K2210/30—Means
    • G10K2210/301—Computational
    • G10K2210/3055—Transfer function of the acoustic system

Definitions

  • Embodiments of the present invention relate to active noise control techniques, and in particular, to a rotating device noise control method and controller. Background technique
  • Active noise control is a technique that uses a secondary-source source to generate sound waves of opposite phases and sound waves of the target noise to cancel each other through a detection-feedback mechanism to achieve the purpose of reducing noise intensity.
  • the noise reduction of active noise control technology can be as high as 10dBA-20dBA, which effectively solves the problem of large size and low energy efficiency of passive noise reduction technology in medium and low frequency noise control.
  • the one-dimensional pipeline active noise control method propagates in the form of plane waves due to the low-frequency sound waves below its cutoff frequency, which has the advantages of relatively simple sound field analysis and control, and the relatively small space of the one-dimensional pipeline.
  • the level sound source is arranged in a simple form, and a good noise reduction effect can be obtained by a single channel, and therefore, more applications are obtained.
  • the one-dimensional pipeline active noise control system includes: a controller, a secondary sound source sounding device, a reference sensor, and an error sensor.
  • the working principle is as follows: the reference sensor detects the target noise according to the detection command, and feeds back the detected target noise to the controller, and the controller processes the target noise to generate an utterance command, and sends the vocal command to the secondary sound source to sound.
  • the secondary sound source sounding device emits a secondary sound wave according to the sounding command to cancel the target noise; the error sensor detects the cancelled noise according to the detecting command (referred to as: after canceling noise), and feeds back to the control Device.
  • the controller corrects the vocal command according to the noise after the cancellation, and then The sounding command is sent to the secondary sound source sounding device, and the secondary sound source sounding device emits the secondary sound wave according to the corrected sounding command, so as to achieve the purpose of reducing the intensity.
  • the signals detected by the reference sensor actually include: target noise, secondary sound waves and background noise from the secondary sound source sounding device; signals detected by the error sensor Includes: Offset noise and background noise.
  • the intensity of the secondary sound wave and the background noise reaches a certain value, the signal error received by the controller is too large or even distorted, thereby affecting the accuracy of the matching of the secondary sound wave emitted by the secondary sound source sounding device with the target noise, affecting each other.
  • the effect of offsetting Based on this, virtual error sensor technology and acoustic feedback cancellation filtering techniques are used to overcome the effects of background noise and secondary sound waves.
  • the implementation method mainly pre-acquires a transfer function between the reference sensor and the virtual error sensor (that is, an error sensor that exists in the process of acquiring the transfer function but does not exist in the actual noise control process), and between the controller and the virtual error sensor.
  • the transfer function A, B, C changes little, through the transfer function A obtained in advance, B, C can accurately predict the target noise and secondary sound waves at the position of the virtual error sensor, and the secondary sound waves at the position of the reference sensor, so that the controller can accurately issue the vocal command, so that the sound wave at the position of the virtual error sensor is completely Offset, to achieve the purpose of noise reduction and noise reduction.
  • the transfer function if the target noise generated by the rotating device changes too much, the transfer function,
  • Embodiments of the present invention provide a method and a controller for controlling noise of a rotating device, which are used to solve the prior art.
  • the noise generated by the rotating device changes greatly during the operation, the defect of noise reduction cannot be realized, and the purpose of reducing the target noise of the rotating device is achieved.
  • Embodiments of the present invention provide a method for controlling noise of a rotating device, including:
  • An embodiment of the present invention provides a controller, including:
  • a signal acquisition module configured to acquire a sound wave signal of noise generated by a rotating device fed back by the reference sensor
  • the query module queries the pre-generated function mapping table according to the rotation speed information to obtain a transfer function
  • a first generating module configured to generate a sounding command according to the transfer function and the sound wave signal
  • a sending module configured to send the sounding command to a secondary sound source sounding device, so that the secondary sound source sounds
  • the device emits a secondary acoustic wave that is used to suppress noise generated by the rotating device.
  • the noise control method and controller of the rotating device generate a function mapping table in advance, acquire the rotation speed information of the rotating device in the noise reduction process, and query the function mapping table according to the rotation speed information to obtain a transfer function suitable for the rotation speed information. And generating an utterance command according to the obtained transfer function, and controlling the secondary sound source uttering device to emit a secondary sound wave to cancel the target noise of the rotating device to achieve the purpose of noise reduction.
  • the embodiment of the present invention solves the problems existing in the prior art by acquiring the transfer function adapted to the target noise according to the rotational speed information of the rotating device and the function mapping table, and is no longer affected by the noise generated by the rotating device, and truly achieves the drop. Noise. DRAWINGS
  • FIG. 1 is a schematic structural diagram of a one-dimensional pipeline active noise control system based on embodiments of the present invention
  • FIG. 2 is a flowchart of a method for controlling noise of a rotating device according to an embodiment of the present invention
  • FIG. 4D is a flowchart of still another embodiment of step 201 according to an embodiment of the present invention
  • FIG. 4 is a flowchart of still another embodiment of step 201 according to an embodiment of the present invention
  • FIG. 6 is a schematic structural diagram of a controller according to another embodiment of the present invention. detailed description
  • FIG. 1 is a schematic structural diagram of a one-dimensional pipeline active noise control system based on embodiments of the present invention.
  • the system of this embodiment includes: a controller 11, a secondary sound source sounding device 12, a reference sensor 13 and a rotating device 14; the controller 11 is connected to the secondary sound source sounding device 12 and the reference sensor 13, respectively.
  • the rotating device 14 can be any device that operates in a rotating or rotating manner; It is preferable to drive the fluid to operate in a rotating or rotating manner, such as a fan, a water pump or the like.
  • the rotating device 14 is a noise source, wherein the noise generated by the rotating device is referred to as target noise.
  • the reference sensor 13 is mainly used to detect the noise generated by the rotating device 14 (ie, the target noise), but due to the presence of the acoustic reflection and the background noise, the reference sensor 13 detects the mixture of the target noise, the secondary sound wave, and the background noise. Sound wave signal.
  • the reference sensor 13 is also used to feed back the detected acoustic signal to the controller 11.
  • the controller 11 is for processing the acoustic signal, generating an utterance command, and transmitting the utterance command to the secondary sound source uttering device 12.
  • the secondary sound source sounding device 12 is for receiving the sounding command transmitted by the controller 11 and emitting a secondary sound wave to cancel the target noise.
  • FIG. 2 is a flowchart of a method for controlling noise of a rotating device according to an embodiment of the present invention. As shown in FIG. 2, the method in this embodiment includes:
  • the reference sensor 13 detects the acoustic wave signal of the noise generated by the rotating device 14 and feeds it back to the controller 11.
  • the acoustic signal is a mixed signal of noise (i.e., target noise) generated by the rotating device 14, secondary acoustic waves, and background noise.
  • Step 201 Acquire rotational speed information of the rotating device.
  • the sound pressure level of the target noise is assumed to be 30dBA; then the sound pressure of the target noise generated when the fan is operated at 4,000 rpm The level will be 45dBA, which means that the fan's speed is doubled, and the corresponding acoustic energy is increased by about 31.6 times.
  • the magnitude of the target noise generated by the rotating device 14 is related to its rotational speed information. Generally, the faster the rotational speed of the rotating device 14, the greater the target noise it produces.
  • the controller 11 acquires the rotational speed information of the rotating device to generate an utterance command according to the rotational speed information to achieve better cancellation of the target noise.
  • Step 202 Query a pre-generated function mapping table according to the rotation speed information to obtain a transfer function.
  • the transfer function described in this embodiment mainly includes: a transfer function A between the reference sensor 13 and the virtual error sensor, and between the controller 11 and the virtual error sensor Transfer function B (transfer function B is mainly used to represent the functional relationship between the utterance command generated by the controller 11 and the acoustic signal at the virtual error sensor position), and the transfer function C between the controller 11 and the reference sensor 13 ( The transfer function C is mainly used to represent a functional relationship between the utterance command generated by the controller 11 and the acoustic signal at the position of the reference sensor 13).
  • the transfer function can be different for different active noise control systems.
  • the function mapping table stores various rotation speed information common to the rotating device and a transfer function corresponding to each rotation speed information.
  • the function map table stores n kinds of rotation speed information, and each rotation speed information corresponds to a different transfer function A, transfer function B, and transfer function C.
  • the controller 11 queries the function mapping table according to the rotation speed information, and acquires a transfer function corresponding to the rotation speed information.
  • the function mapping table is pre-generated.
  • the function map may be stored on the controller 11, or may be stored on other servers and allowed to be queried by the controller 11.
  • Step 203 Generate an utterance command according to the transfer function obtained by the query function mapping table and the sound wave signal fed back by the reference sensor. Specifically, after the controller 11 queries the function mapping table to obtain the transfer function corresponding to the rotational speed information, the transfer function B, and the transfer function C, the sound wave fed back to the reference sensor 13 according to the obtained transfer function A and transfer function transfer function C The signal is processed, and an utterance command is generated based on the processing result.
  • Step 204 Send the utterance command to the secondary sound source uttering device, so that the secondary sound source uttering device emits a secondary sound wave, and the secondary sound wave is used to suppress the noise generated by the rotating device.
  • the generated utterance command is sent to the secondary sound source uttering device 12; and the secondary sound source uttering device 12 issues the secondary sound wave according to the utterance command.
  • the secondary sound wave propagates in the direction of the reference sensor 13, cancels the target noise, and achieves the purpose of suppressing the target noise.
  • the controller obtains the rotation speed information of the rotation device, determines a transfer function suitable for the target noise under the rotation speed information according to the rotation speed information, and then feeds the sound wave fed back to the reference sensor according to the acquired transfer function.
  • the signal is processed to generate a sounding command, so that the secondary sound source sounding device emits a secondary sound wave having a phase opposite to the target noise and the intensity is equivalent to cancel the target noise, thereby achieving the purpose of noise reduction.
  • the function mapping table pre-stores the transfer function corresponding to the plurality of rotational speed information of the rotating device.
  • the rotating device noise control method of the embodiment further includes the step of generating a function mapping table before the step 202, wherein the step of generating the function mapping table specifically includes:
  • the rotation control means may be provided as a functional component of the rotary device 14 in the rotary device 14, or may be connected to the rotary device 14 independently of the rotary device 14.
  • the rotation control means is for transmitting a rotation speed adjustment signal to the rotation control means to adjust the rotation speed of the rotation means 14 for the purpose of adjusting the rotation speed information.
  • Step 20b Obtain a transfer function corresponding to each rotation speed information to generate a function mapping table.
  • the transfer function generated in this embodiment includes: a transfer function VIII. Transfer function B and transfer function C. Assuming that the rotating device has n kinds of rotational speed information, the generated function mapping table will be as shown in Table 1. 4A-4C will take the transfer function corresponding to the rotational speed information as an example to describe the process of obtaining the transfer function in detail.
  • the operation principle of the virtual error sensor is employed, that is, in the acquisition process, an error sensor 15 is provided, which is temporarily placed at a position away from the reference sensor 13 as shown in Fig. 4A.
  • the secondary sound source sounding device 12 is turned off (not shown in Figure 4A), at which point only the rotating device 14 will be rotating.
  • the transfer function eight between the reference sensor 11 and the error sensor 15 corresponding to the target noise under the rotational speed information is calculated by the controller 11 based on the acoustic signal fed back by the reference sensor 13 and the error sensor 15.
  • the controller 11 gives a sounding command to the secondary sound source sounding device 12, at which time the secondary sound source sounding device 12 emits a secondary sound wave according to the sounding command; the secondary sound wave will propagate in the direction of the error sensor 15, and the error sensor 15 will detect
  • the acoustic signal (mainly secondary acoustic wave) is detected and fed back to the controller 11; the controller 11 calculates a transfer function between the controller 11 and the error sensor 15 based on the transmitted utterance command and the acoustic signal fed back by the error sensor 15.
  • the test is continued in an environment where the turning device 14 (not shown in Fig. 4C, while the error sensor 15 is not shown) and low background noise (ensuring that the background noise can be ignored) is turned off.
  • the controller 11 issues a sounding command to the secondary sound source sounding device 12, at which time the secondary sound source sounding device 12 emits a secondary sound wave according to the sounding command; the secondary sound wave will propagate toward the reference sensor 13, reference The sensor 13 will detect the acoustic signal (mainly the secondary acoustic wave) and feed it back to the controller 11; the controller 11 calculates the controller 11 and the reference sensor 13 based on the transmitted utterance command and the acoustic signal fed back by the reference sensor 13.
  • Transfer function between It is explained here that the acquisition transfer function ⁇ and the acquisition transfer function C can also be implemented by the same test process.
  • the order of obtaining the respective transfer functions is not limited to the above order, and may be any one of the order of acquisition.
  • the rotation control device sends a rotation speed adjustment signal to the control rotation device 14 to complete the rotation speed information adjustment
  • the target noise under the rotation speed information is tested once, thereby obtaining the reference sensor 11 corresponding to the target noise under the rotation speed information.
  • the transfer function ⁇ and transfer function C since the acquisition process has no relationship with the target noise, it can be re-acquired or not re-acquired (ie, only once).
  • step 203 when the rotating device 14 generates target noise, and the controller 11 sends an audible command to the secondary sound source sounding device 12, the secondary sound source generating device 12 issues a secondary In the acoustic environment, the acoustic signal detected by the sensor 13 (including the target noise, the secondary acoustic wave, and the background noise) is referenced; the controller 11 first calculates the position of the reference sensor 13 based on the transfer function C and the previous utterance command.
  • a target acoustic wave signal at the sensor position ie, the virtual error sensor
  • applying the transfer function B and the calculated target acoustic wave signal calculating the secondary acoustic wave required by the secondary sound source sounding device 12, and generating the secondary sound wave
  • the sounding command corresponding to the sound wave, and the sounding command is provided to the secondary sound source 12, secondary source emitting means 12 based on the secondary issue command utterance acoustic wave propagates to the position where the assumed error sensor, cancel each other and the position of the target acoustic signal, to achieve the purpose of noise reduction.
  • step 201 provides a specific implementation manner of step 201, which includes the following steps:
  • Step 201a Receive a rotation speed adjustment signal sent by the rotation control device.
  • the rotation control means may send a rotation speed adjustment signal directly to the controller after transmitting the rotation speed adjustment signal to the rotation means.
  • the rotation control device can be disposed independently of the rotation device and independently of the controller, but at the same time is connected to the rotation device and the controller.
  • the rotation control device may be integrally provided with the controller and connected to the rotation device and the controller.
  • Step 201b Acquire the rotation speed information according to the rotation speed adjustment signal.
  • the controller parses the speed adjustment signal to obtain the rotation speed information. After that, the controller continues to execute the transfer function based on the acquired speed information, and the subsequent operations.
  • the rotation control device and the controller need only be connected, and the rotation control device sends a rotation speed adjustment signal to the controller, which is simple to implement, has less modification to the existing equipment, and has a lower cost.
  • Step 201c Acquire a signal characteristic of the target noise according to the sound wave signal fed back by the reference sensor.
  • the controller 11 obtains the signal characteristic of the target noise by processing the sound wave signal.
  • the signal characteristic of the target noise may refer to the signal strength of the target noise, for example: sound intensity level or sound pressure level; and may also refer to the frequency characteristic of the target noise, such as the peak value of the target noise (ie, the peak value of the rotating noise in the industry) )Wait.
  • the process of processing the sound wave signal by the controller 11 includes the following cases: The first case: If the sound wave signal received by the controller 11 twice before and after is greatly different, the influence of the background noise and the secondary sound wave can be determined. Smaller, therefore, the controller 11 can directly use the received acoustic signal as the target noise.
  • the controller 11 can compare the noise sound pressure level or sound wave of the sound signal twice before and after. The peak value of the signal, etc., to identify the difference between the two acoustic signals before and after.
  • the second case if the difference of the acoustic signal received by the controller 11 twice before and after is not so large that the background noise and the secondary sound wave can be ignored, the controller 11 firstly according to the current utterance command and the transfer function corresponding thereto.
  • C. Calculate the secondary sound wave transmitted by the secondary sound wave to the position where the reference sensor 13 is located, and then subtract the sound wave signal fed back from the reference sensor 13 and the calculated secondary sound wave to obtain the target noise.
  • Step 201d Query a pre-generated rotation speed mapping table according to the signal characteristic of the target noise to obtain the rotation speed information.
  • the speed mapping table stores various kinds of rotational speed information commonly used by the rotating device 14 and signal characteristics of the target noise under each rotational speed information.
  • the speed map is pre-generated and stored, which may be stored directly on the controller 11, or may be stored on other servers and allowed to be queried by the controller 11.
  • the controller 11 queries the speed map to obtain the corresponding speed information. Thereafter, the controller 11 continues to execute the transfer function and the subsequent operations based on the rotational speed information.
  • an operation of generating a rotational speed map is also included before the implementation of this embodiment.
  • the rotational speed information of the rotating device 14 can be adjusted by the rotation control device, and then detected by the reference sensor 13 to obtain the signal characteristics of the target noise under each of the rotational speed information, thereby generating a rotational speed map.
  • Table 2 shows the correspondence between each type of rotation speed information and the signal characteristics of the target noise when the rotary device has n kinds of rotational speed information.
  • This embodiment also has the advantage of being easy to implement and low in cost.
  • FIG. 5 is a schematic structural diagram of a controller according to an embodiment of the present invention. As shown in FIG. 5, the controller of this embodiment includes: a signal acquisition module 50, a rotation speed acquisition module 51, a query module 52, a first generation module 53 and a transmission module 54.
  • the signal acquisition module 50 is configured to acquire an acoustic wave signal of the noise generated by the rotating device fed back by the reference sensor; the rotational speed acquiring module 51 is configured to acquire the rotational speed information of the rotating device; and the query module 52 is connected to the rotational speed acquiring module 51, and is configured to Querying the pre-generated function mapping table to obtain the transfer function according to the rotation speed information, and providing the obtained transfer function to the first generation module 53.
  • the first generation module 53 is connected to the signal acquisition module 50 and the query module 52 for Querying the transfer function obtained by the function mapping table and the sound signal fed back by the reference sensor to generate a sounding command; the sending module 54 is connected to the first generating module 53 for transmitting the sounding command to the secondary sound source sounding device, so that the secondary The sound source sounding device emits a secondary sound wave for suppressing noise generated by the rotating device.
  • the controller may include a storage module (not shown) for storing the function mapping table for querying by the query module 52.
  • the function mapping table can also be stored on other servers and allowed to be queried by the query module 52 of the controller for the controller to implement.
  • the function modules of the controller of this embodiment can be used to execute the process of the method shown in FIG. 2, and the specific working principle is not described again. For details, refer to the description of the method embodiment.
  • the controller of the embodiment determines the transfer function suitable for the target noise under the rotational speed information according to the rotational speed information query function mapping table by acquiring the rotational speed information of the rotating device, and then the acoustic signal fed back to the reference sensor according to the acquired transfer function. Processing, generating a sounding command, so that the secondary sound source sounding device emits a secondary sound wave having a phase opposite to the target noise and having the same intensity, which solves the problem that the prior art adopts the same transfer function cannot be different from the target noise used when acquiring the transfer function.
  • the large target noise is used for noise cancellation, and the problem of noise reduction cannot be achieved.
  • the noise reduction processing is no longer limited by the target noise level, and the noise reduction is realized in the true sense.
  • the receiving unit 511 is configured to receive the rotation speed adjustment signal sent by the rotation control device.
  • the first acquisition unit 512 is connected to the receiving unit 511, and configured to acquire the rotation speed information according to the rotation speed adjustment signal.
  • the rotation speed acquisition module 51 of the embodiment may further adopt another implementation structure, including: a second acquisition unit 513 and a third acquisition unit 514.
  • the function unit of the speed obtaining module 51 can be used to perform the process of the implementation of the step 101 provided by the foregoing method embodiment.
  • the working principle is not described here. For details, refer to the description of the foregoing method embodiment.
  • the controller of this embodiment further includes: a second generation module 61.
  • the second generating module 61 is configured to acquire a transfer function corresponding to each type of rotational speed information of the rotating device, and generate a function mapping table including a transfer function corresponding to the rotational speed information and the rotational speed information.
  • the second generating module 61 can be a control unit for performing tests by using various functional modules of the control controller, such as a rotating device, a rotation control device, a secondary sound source generating device, and a reference sensor, to generate a function. Mapping table.
  • a rotating device such as a rotating device, a rotation control device, a secondary sound source generating device, and a reference sensor.
  • the controller of this embodiment further includes: a third generation module 62.
  • the third generating module 62 is configured to generate a rotational speed mapping table including the rotational speed information and the signal characteristic corresponding to the rotational speed information according to the signal characteristic of the target noise under each rotational speed information of the rotating device acquired by the reference sensor.
  • the third generation module 62 may also be a control unit for controlling the rotation device, the rotation control device, the reference sensor, and the like to perform a test, thereby generating a rotation speed mapping table according to the information acquired by the test.
  • Specific For the working principle refer to the process of generating the speed mapping table in the second implementation manner of step 101, and details are not described herein again.
  • the rotational control device and the controller may also be integrally provided.

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Description

转动装置噪声控制方法及控制器
技术领域
本发明实施例涉及主动噪声控制技术， 尤其涉及一种转动装置噪声控制 方法及控制器。 背景技术
随着生活水平的提高和环保意识的增强， 人们对设备排放的噪声提出了 越来越高的要求， 噪声不但是产品市场准入的指标之一， 而且已经成为产品 差异化的重要因素。 由于产品性能提升以及小型化需求， 传统的被动降噪技 术在面对中、 低频噪声控制要求时， 其集成度、 能效等方面面临越来越大的 挑战。 于是， 出现了主动噪声控制技术。 主动噪声控制是一种通过侦测 -反馈 机制， 利用次级声源产生相反相位的声波与目标噪声的声波相互抵消， 达到 降低噪声强度目的的技术。 在 100Hz-2000Hz的频段， 主动噪声控制技术的 降噪量可高达 10dBA-20dBA, 有效解决了被动降噪技术在中、 低频噪声控制 时所面临的大尺寸、 低能效的问题。
在所有的主动噪声控制技术中， 一维管道主动噪声控制方法由于其截止 频率以下的低频声波以平面波形式传播， 具有声场分析和控制相对简单的优 点， 又由于一维管道的空间相对狭小， 次级声源的排布形式简单， 通过单通 道即可取得较好的降噪效果， 因此， 得到较多应用。 一维管道主动噪声控制 系统包括： 控制器、 次级声源发声装置、 参考传感器和误差传感器。 其工作 原理为： 参考传感器根据侦测命令侦测目标噪声， 并将侦测到的目标噪声反 馈给控制器， 控制器对目标噪声进行处理生成发声命令， 将发声命令发送给 次级声源发声装置， 次级声源发声装置根据发声命令发出次级声波， 以与目 标噪声进行抵消；误差传感器根据侦测命令侦测经过抵消后的噪声（称之为： 抵消后噪声） ， 并反馈给控制器。 控制器根据抵消后噪声修正发声命令， 再 将发声命令发送给次级声源发声装置， 次级声源发声装置根据修正后的发声 命令发出次级声波， 如此循环， 以达到降低强度的目的。
在实际使用过程中， 由于声反馈和背景噪声的存在， 参考传感器侦测到 的信号实际包括： 目标噪声、次级声源发声装置发出的次级声波和背景噪声； 误差传感器侦测到的信号包括： 抵消后噪声和背景噪声。 当次级声波和背景 噪声的强度达到一定数值， 将导致控制器收到的信号误差过大甚至失真， 从 而影响次级声源发声装置发出的次级声波与目标噪声匹配的准确性， 影响相 互抵消的效果。 基于此， 采用了虚拟误差传感器技术和声反馈消除滤波技术 来克服背景噪声和次级声波的影响。 该实现方式主要是预先获取参考传感器 和虚拟误差传感器 （即在获取传递函数过程中存在， 而在实际噪声控制过程 中不存在的误差传感器）之间的传递函数 、 控制器和虚拟误差传感器之间 的传递函数 B、 以及控制器和次级声源发声装置之间的传递函数 C, 并存储 到控制器上； 在实际噪声控制过程中， 假设存在一误差传感器 （即虚拟误差 传感器） ， 由控制器根据上述三个传递函数来消除背景噪声和次级声波的影 响。
在实现本发明过程中， 发明人发现现有技术中至少存在如下问题： 当转 动装置产生的目标噪声变化不大时， 传递函数 A、 B、 C 变化很小， 通过预 先获取的传递函数 A、 B、 C 可以准确预测出虚拟误差传感器位置处的目标 噪声和次级声波、 以及参考传感器位置处的次级声波， 使得控制器可以准确 发出发声命令， 从而使虚拟误差传感器位置处的声波完全被抵消， 达到消声 降噪的目的。 但是， 如果转动装置产生的目标噪声变化过大， 传递函数 、
B、 C变化会 4艮大， 之前获取的传递函数 A、 B、 C将不适用， 从而无法达到 消声降噪的目的。
发明内容
本发明实施例提供一种转动装置噪声控制方法及控制器， 用以解决现有技 术中因转动装置产生的噪声变化较大时无法实现降噪的缺陷， 实现降低转动装 置的目标噪声的目的。
本发明实施例提供一种转动装置噪声控制方法， 包括：
获取参考传感器反馈的转动装置产生的噪声的声波信号；
获取所述转动装置的转速信息；
根据所述转速信息， 查询预先生成的函数映射表以获取传递函数； 根据所述传递函数和所述声波信号， 生成发声命令；
将所述发声命令发送给次级声源发声装置， 以使所述次级声源发声装置 根据所述发声命令发出次级声波， 所述次级声波用以抑制所述转动装置产生 的噪声。
本发明实施例提供一种控制器， 包括：
信号获取模块， 用于获取参考传感器反馈的转动装置产生的噪声的声波信 号；
转速获取模块， 用于获取所述转动装置的转速信息；
查询模块， 根据所述转速信息， 查询预先生成的函数映射表以获取传递函 数；
第一生成模块， 用于根据所述传递函数和所述声波信号， 生成发声命令； 发送模块， 用于将所述发声命令发送给次级声源发声装置， 以使所述次级 声源发声装置发出次级声波， 所述次级声波用以抑制所述转动装置产生的噪声。
本发明实施例的转动装置噪声控制方法及控制器，预先生成函数映射表， 在降噪过程中， 获取转动装置的转速信息， 根据转速信息查询函数映射表， 获取与转速信息相适应的传递函数，进而根据获取的传递函数生成发声命令， 控制次级声源发声装置发出次级声波以与转动装置的目标噪声相抵消， 达到 降噪的目的。 本发明实施例通过根据转动装置的转速信息和函数映射表获取 与目标噪声相适应的传递函数， 解决了现有技术存在的问题， 不再受转动装 置产生的噪声大小的影响， 真正实现了降噪目的。 附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案， 下面将对实施 例或现有技术描述中所需要使用的附图作一简单地介绍， 显而易见地， 下面描 述中的附图是本发明的一些实施例， 对于本领域普通技术人员来讲， 在不付出 创造性劳动的前提下， 还可以根据这些附图获得其他的附图。
图 1为本发明各实施例所基于的一维管道主动噪声控制系统的结构示意图； 图 2为本发明一实施例提供的转动装置噪声控制方法的流程图；
图 3为本发明另一实施例提供的转动装置噪声控制方法的流程图； 图 4A-图 4C为本发明一实施例中提供的获取转速信息对应的传递函数的状 态示意图；
图 4D为本发明一实施例提供的步骤 201的一种实施方式的流程图； 图 4E为本发明一实施例提供的步骤 201的又一种实施方式的流程图； 图 5为本发明一实施例提供的控制器的结构示意图；
图 6为本发明另一实施例提供的控制器的结构示意图。 具体实施方式
为使本发明实施例的目的、 技术方案和优点更加清楚， 下面将结合本发明 实施例中的附图， 对本发明实施例中的技术方案进行清楚、 完整地描述， 显然， 所描述的实施例是本发明一部分实施例， 而不是全部的实施例。 基于本发明中 的实施例， 本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其 他实施例， 都属于本发明保护的范围。
图 1为本发明各实施例所基于的一维管道主动噪声控制系统的结构示意图。 如图 1所示， 本实施例的系统包括： 控制器 11、 次级声源发声装置 12、 参考传 感器 13和转动装置 14; 控制器 11分别与次级声源发声装置 12和参考传感器 13连接。 其中， 转动装置 14可以是任何以转动或旋转方式工作的设备； 其中， 优选以转动或旋转方式驱动流体进行工作的设备， 例如风扇、 水泵等。 转动装 置 14是噪声源， 其中， 由转动装置产生的噪声被称之为目标噪声。 参考传感器 13主要用于侦测转动装置 14产生的噪声 （即目标噪声）， 但由于声反射和背景 噪声的存在， 参考传感器 13侦测到的是目标噪声、 次级声波以及背景噪声等混 合后的声波信号。 参考传感器 13还用于将侦测到的声波信号反馈给控制器 11。 控制器 11用于对声波信号进行处理， 生成发声命令， 并将发声命令发送给次级 声源发声装置 12。 次级声源发声装置 12用于接收控制器 11发送的发声命令， 并发出次级声波， 以与目标噪声相抵消。
图 2为本发明一实施例提供的转动装置噪声控制方法的流程图。 如图 2所 示， 本实施例的方法包括：
步骤 200、 获取参考传感器反馈的转动装置产生的噪声的声波信号。
具体的， 参考传感器 13侦测转动装置 14产生的噪声的声波信号， 并反馈 给控制器 11。 其中， 声波信号是转动装置 14产生的噪声 （即目标噪声）、 次级 声波以及背景噪声等的混合信号。
步骤 201、 获取转动装置的转速信息。
其中， 转动装置 14的转速信息主要是指与转速相关的信息， 例如单位时间 内的旋转次数， 该转速信息也可以可视转动装置 14的不同而有所不同。 例如： 如果转动装置 14为风扇，则转速信息是指风扇的电机在单位时间内的旋转次数。 又例如： 如果转动装置 14是水泵， 则转速信息是指水泵的电机在单位时间内的 旋转次数。 另外， 每个转动装置通常会有不同的转速， 一种转速对应于一种转 速信息； 当转动装置以不同转速运行时， 将产生不同的目标噪声。 例如： 一款 风扇在以每分钟 2000转的转速工作时，假设产生的目标噪声的声压级为 30dBA; 那么该款风扇在以每分钟 4000转的转速工作时， 产生的目标噪声的声压级将为 45dBA, 也就是说风扇的转速每提高一倍， 对应的声能量大约提高 31.6倍。 由 此可见， 转动装置 14产生的目标噪声的大小与其转速信息相关。 通常， 转动装 置 14的转速越快， 其所产生的目标噪声就越大。 为了提高对目标噪声的抵消效果， 控制器 11获取转动装置的转速信息， 以 根据转速信息生成发声命令， 以实现更好的抵消目标噪声。
步骤 202、 根据转速信息， 查询预先生成的函数映射表以获取传递函数。 对于图 1 所示的一维管道主动噪声控制系统而言， 本实施例所述的传递函 数主要包括： 参考传感器 13和虚拟误差传感器之间的传递函数 A、 控制器 11 和虚拟误差传感器之间的传递函数 B (传递函数 B主要用以表示控制器 11生成 的发声命令与虚拟误差传感器位置处的声波信号之间的函数关系） 、 以及控制 器 11和参考传感器 13之间的传递函数 C (传递函数 C主要用以表示控制器 11 生成的发声命令与参考传感器 13位置处的声波信号之间的函数关系） 。 对于不 同的主动噪声控制系统， 传递函数可以不同。
其中， 函数映射表中存储有转动装置常见的多种转速信息以及每种转速信 息对应的传递函数。 如表 1所示， 该函数映射表中存储有 n种转速信息， 每种 转速信息对应于不同的传递函数 A、 传递函数 B和传递函数 C。 具体的， 控制 器 11根据转速信息查询该函数映射表， 获取与该转速信息对应的传递函数。 在 本实施例中， 该函数映射表是预先生成的。 另外， 该函数映射表可以存储在控 制器 11上， 也可以存储在其他服务器上并允许控制器 11查询。
表 1
Figure imgf000008_0001
步骤 203、根据查询函数映射表获取的传递函数和参考传感器反馈的声波信 号， 生成发声命令。 具体的， 控制器 11查询函数映射表获取到与转速信息对应的传递函数八、 传递函数 B和传递函数 C之后， 根据获取的传递函数 A、 传递函数 传递函 数 C对参考传感器 13反馈的声波信号进行处理， 根据处理结果生成发声命令。
步骤 204、 将发声命令发送给次级声源发声装置， 以使次级声源发声装置发 出次级声波， 次级声波用以抑制转动装置产生的噪声。
具体的， 控制器 11生成发声命令之后， 将生成的发声命令发送给次级声源 发声装置 12; 次级声源发声装置 12根据发声命令发出次级声波。 次级声波向参 考传感器 13的方向传播， 与目标噪声相抵消， 达到抑制目标噪声的目的。
本实施例的转动装置噪声控制方法， 控制器通过获取转动装置的转速信息， 根据转速信息确定与该转速信息下的目标噪声相适应的传递函数， 然后根据获 取的传递函数对参考传感器反馈的声波信号进行处理， 生成发声命令， 以使次 级声源发声装置发出与目标噪声相位相反、 强度相当的次级声波， 以抵消目标 噪声， 实现降噪目的。 本实施例提供函数映射表预先存储转动装置多种转速信 息对应的传递函数， 在噪声控制过程中， 根据转动装置的实际转速获取相应的 标噪声相差较大的目标噪声进行噪声抵消， 无法实现降噪目的的问题， 使降噪 处理不再受目标噪声大小的限制， 从真正意义上实现了降噪。
进一步， 如图 3所示， 本实施例的转动装置噪声控制方法在步骤 202之前 还包括生成函数映射表的步骤， 其中生成函数映射表的步骤具体包括：
步骤 20a、 通过转动控制装置调节转动装置的转速信息。
在本实施例中， 转动控制装置可以作为转动装置 14的功能部件设置于转动 装置 14内， 也可以作为独立于转动装置 14, 但与转动装置 14连接。 在本实施 例中， 转动控制装置用于向转动控制装置发送转速调节信号来调节转动装置 14 的转速， 以达到调节转速信息的目的。
步骤 20b、 获取每种转速信息对应的传递函数， 以生成函数映射表。
以图 1 所示的系统为例， 本实施例所生成的传递函数包括： 传递函数八、 传递函数 B和传递函数 C。 假设转动装置有 n种转速信息， 则生成的函数映射 表将如表 1所示。下面图 4A-图 4C将以获取一种转速信息对应的传递函数为例， 详细说明获取传递函数的过程。
在本实施例中采用虚拟误差传感器工作原理， 即在该获取过程中， 设置一 误差传感器 15 , 该误差传感器 15暂时放置于一个远离参考传感器 13的位置如 图 4A所示。 在背景噪声较低的环境下 （要确保背景噪声可被忽略）进行测试， 将次级声源发声装置 12关闭 （在图 4A中未示出） ， 此时， 将仅存在转动装置 14在转动控制装置设定的某一转速信息下产生的目标噪声， 该目标噪声向误差 传感器 15进行传播， 此时， 参考传感器 13和误差传感器 15都会侦测到声波信 号， 并分别反馈给控制器 11 ; 由控制器 11根据参考传感器 13和误差传感器 15 反馈回来的声波信号计算出在该转速信息下的目标噪声对应的参考传感器 11和 误差传感器 15之间的传递函数八。
接着如图 4B所示， 改变测试环境， 在关闭转动装置 14 (在图 4B中未示出 转动装置 14和参考传感器 13 ) , 低背景噪声 （确保背景噪声可被忽略）的环境 下， 控制器 11给次级声源发声装置 12发出发声命令， 此时次级声源发声装置 12会根据发声命令发出次级声波； 次级声波将会向误差传感器 15的方向传播， 误差传感器 15将会侦测到声波信号（主要是次级声波） , 并反馈给控制器 11 ; 控制器 11根据发送的发声命令和误差传感器 15反馈的声波信号计算出控制器 11与误差传感器 15之间的传递函数
再接着如图 4C所示， 在关闭转动装置 14 (在图 4C中未示出， 同时未示出 误差传感器 15 ) , 低背景噪声 （确保背景噪声可被忽略）的环境下， 继续测试。 此时， 控制器 11向次级声源发声装置 12发出发声命令， 此时次级声源发声装 置 12会根据发声命令发出次级声波； 次级声波将会向参考传感器 13的方向传 播， 参考传感器 13将会侦测到声波信号 （主要是次级声波） ， 并反馈给控制器 11 ; 控制器 11根据发送的发声命令和参考传感器 13反馈的声波信号计算出控 制器 11与参考传感器 13之间的传递函数 。 在此说明， 获取传递函数 Β和获取传递函数 C也可以采用同一个测试过程 来实现。 另外， 上述获取各个传递函数的先后顺序并不限于上述顺序， 可以是 任意一种获取顺序。
其中， 每当转动控制装置通过发送转速调节信号给控制转动装置 14完成一 次转速信息调节时， 针对该转速信息下的目标噪声进行一次测试， 从而获取该 转速信息下的目标噪声对应的参考传感器 11和误差传感器 15之间的传递函数 Α。 而对于传递函数 Β和传递函数 C, 由于其获取过程与目标噪声没有关系， 因 此， 可以选择重新获取， 也可以不再重新获取（即仅获取一次） 。
当对转动装置 14的所有常用转速信息下的目标噪声都进行测试后， 即可根 据测试结果生成如表 1所示的函数映射表。
基于上述， 本实施例提供一种步骤 203的具体实施方式： 当转动装置 14产 生目标噪声， 而控制器 11发送发声命令给次级声源发声装置 12, 次级声源发生 装置 12发出次级声波的环境下， 参考传感器 13侦测的声波信号 （包括目标噪 声、 次级声波和背景噪声）； 控制器 11首先根据传递函数 C与上一次的发声命 令， 计算出参考传感器 13所在位置处的次级声波， 然后将参考传感器 13反馈 的声波信号与计算出的次级声波相减得出目标噪声； 接着通过应用传递函数 A 和得出的目标噪声， 计算该目标噪声传播至假设存在的误差传感器位置 （即虚 拟误差传感器）处的目标声波信号； 然后， 应用传递函数 B和计算出的目标声 波信号， 计算出需要次级声源发声装置 12发出的次级声波， 并生成与该次级声 波对应的发声命令， 将发声命令提供给次级声源发声装置 12, 次级声源发声装 置 12依据发声命令发出次级声波， 传播至假设存在的误差传感器位置， 与该位 置的目标声波信号相互抵消， 实现降噪目的。
更进一步， 如图 4D所示， 本实施例提供一种步骤 201的具体实施方式， 包 括以下步骤：
步骤 201a、 接收转动控制装置发送的转速调节信号。
具体的， 转动控制装置向转动装置发送转速调节信号； 转动装置根据转速 调节信号进行转速调节， 例如： 一款风扇根据转动控制装置发送的转速调节信 号由 1档位调节到 2档位。 之后， 转动装置向转动控制装置返回调节成功信息； 转动控制装置在接收到调节成功信息之后， 向控制器发送转速调节信号， 以告 知控制器转动装置调节后的转速信息。
另外， 转动控制装置也可以在向转动装置发送转速调节信号后， 直接向控 制器发送转速调节信号。
其中， 转动控制装置可以既独立于转动装置又独立于控制器设置， 但同时 与转动装置和控制器连接。 另外， 转动控制装置还可以与控制器一体设置， 并 与转动装置和控制器连接。
步骤 201b、 根据转速调节信号， 获取转速信息。
具体的， 控制器对转速调节信号进行解析， 从中获取转速信息。 之后， 控 制器继续执行根据获取的转速信息 , 获取传递函数以及后续操作。
该实施方式只需将转动控制装置和控制器连接， 并使转动控制装置向控制 器发送一个转速调节信号即可， 其实现简单， 对现有设备的改动较小， 实现成 本较低。
更进一步， 如图 4E所示， 本实施例另提供一种步骤 201的具体实施方式， 包括：
步骤 201c、 根据参考传感器反馈的声波信号， 获取目标噪声的信号特征； 具体的， 控制器 11通过对声波信号进行处理， 获取目标噪声的信号特征。 目标噪声的信号特征可以是指目标噪声的信号强度， 例如： 声强级或声压级； 还可以是指目标噪声的频媒特性， 例如目标噪声的峰值 (即业界所说的旋转噪 声的峰值）等。 其中，控制器 11对声波信号进行处理的过程包括以下几种情况： 第一种情况： 如果控制器 11前后两次接收到的声波信号差距很大， 则可以 确定背景噪声和次级声波的影响较小， 因此， 控制器 11可以直接将接收到的声 波信号作为目标噪声。
例如： 控制器 11可以通过比较前后两次声波信号的噪声声压级别或者声波 信号的峰值等， 来识别前后两次声波信号的差距。
第二种情况： 如果控制器 11前后两次接收到的声波信号差距没有大到可以 将背景噪声和次级声波忽略掉的程度， 则控制器 11首先根据当前发声命令和与 之对应的传递函数 C, 计算出次级声波传输到参考传感器 13所在位置处的次级 声波， 然后将参考传感器 13反馈的声波信号与计算出的次级声波相减得出目标 噪声。
步骤 201d、 根据目标噪声的信号特征， 查询预先生成的转速映射表， 以获 取转速信息。
其中， 转速映射表中存储有转动装置 14常用的多种转速信息和每种转速信 息下目标噪声的信号特征。 该转速映射表是预先生成并存储好的， 其可以直接 存储在控制器 11上， 也可以存储在其他服务器上并允许控制器 11查询。
具体的， 控制器 11在获取目标噪声的信号特征后， 查询转速映射表就可以 获取相应的转速信息。 之后， 控制器 11继续执行根据转速信息， 获取传递函数 以及后续操作。
在该实施方式实施之前还包括： 生成转速映射表的操作。 具体的， 可以通 过转动控制装置调节转动装置 14的转速信息， 然后由参考传感器 13侦测以获 取每种转速信息下的目标噪声的信号特征， 从而生成转速映射表。 例如： 表 2 示出转动装置有 n种转速信息时， 每种转速信息与目标噪声的信号特征的对应 关系。
表 2
转速信息种类 目标噪声的信号特征 X
第 1种 XI 第 2种 X2
第 3种 X3 第 4种 X4
Figure imgf000014_0001
该实施方式同样具有易于实现和成本低的优点。
图 5为本发明一实施例提供的控制器的结构示意图。 如图 5所示， 本实施 例的控制器包括： 信号获取模块 50、 转速获取模块 51、 查询模块 52、 第一生成 模块 53和发送模块 54。
其中， 信号获取模块 50, 用于获取参考传感器反馈的转动装置产生的噪声 的声波信号； 转速获取模块 51 , 用于获取转动装置的转速信息； 查询模块 52, 与转速获取模块 51连接， 用于根据转速信息， 查询预先生成的函数映射表以获 取传递函数， 并将获取的传递函数提供给第一生成模块 53 ; 第一生成模块 53 , 与信号获取模块 50和查询模块 52连接， 用于根据查询函数映射表获取的传递 函数和参考传感器反馈的声波信号， 生成发声命令； 发送模块 54, 与第一生成 模块 53连接， 用于将发声命令发送给次级声源发声装置， 以使次级声源发声装 置发出次级声波， 该次级声波用以抑制转动装置产生的噪声。 其中， 控制器可 以包括一存储模块（未示出） ， 用于存储该函数映射表， 以便于查询模块 52查 询。 另外， 该函数映射表也可以存储在其他服务器上并允许控制器的查询模块 52查询， 以便于控制器实现。
本实施例的控制器的各功能模块可用于执行图 2 所示方法的流程， 其具体 工作原理不再赘述， 详见方法实施例的描述。
本实施例的控制器， 通过获取转动装置的转速信息， 根据转速信息查询函 数映射表确定与该转速信息下的目标噪声相适应的传递函数， 然后根据获取的 传递函数对参考传感器反馈的声波信号进行处理， 生成发声命令， 以使次级声 源发声装置发出与目标噪声相位相反、 强度相当的次级声波， 解决了现有技术 采用相同传递函数无法对与获取传递函数时所用目标噪声相差较大的目标噪声 进行噪声抵消， 无法实现降噪目的的问题， 降噪处理不再受目标噪声大小的限 制， 从真正意义上实现了降噪。
图 6 为本发明另一实施例提供的控制器的结构示意图。 本实施例基于图 5 所示实施例实现，如图 6所示，本实施例的转速获取模块 51包括：接收单元 511 和第一获取单元 512。
具体的， 接收单元 511 , 用于接收转动控制装置发送的转速调节信号； 第一 获取单元 512, 与接收单元 511连接， 用于根据转速调节信号， 获取转速信息。
另外， 如图 6所示， 本实施例的转速获取模块 51还可以采用另一种实现结 构， 包括： 第二获取单元 513和第三获取单元 514。
具体的， 第二获取单元 513 , 用于根据参考传感器反馈的声波信号， 获取目 标噪声的信号特征； 第三获取单元 514, 与第二获取单元 513连接， 用于根据目 标噪声的信号特征， 查询预先生成的转速映射表， 以获取转速信息。 其中， 目 标噪声的信号特征可以是指目标噪声的信号强度， 例如： 声强级或声压级； 还 可以是指目标噪声的频媒特性， 例如目标噪声的峰值 (即业界所说的旋转噪声 的峰值）等。
其中， 转速获取模块 51的功能单元可用于执行上述方法实施例提供的步骤 101的实施方式的流程， 其工作原理不再赘述， 详见上述方法实施例的描述。
进一步， 如图 6所示， 本实施例的控制器还包括： 第二生成模块 61。 该第 二生成模块 61 , 用于获取转动装置的每种转速信息对应的传递函数， 生成包括 转速信息和转速信息对应的传递函数的函数映射表。
具体的， 该第二生成模块 61可以为一控制单元， 用于通过控制控制器的各 功能模块配合转动装置、 转动控制装置、 次级声源发生装置以及参考传感器等 来完成测试， 以生成函数映射表。 其具体工作原理可参见图 3和图 4A-图 4C所 示生成函数映射表的流程， 在此不再赘述。
更进一步， 本实施例的控制器还包括： 第三生成模块 62。 该第三生成模块 62, 用于根据参考传感器获取的转动装置的每种转速信息下的目标噪声的信号 特征， 生成包括转速信息和与转速信息对应的信号特征的转速映射表。 具体的， 该第三生成模块 62也可以是一控制单元， 用于控制转动装置、 转动控制装置以 及参考传感器等进行测试， 从而根据测试获取的信息生成转速映射表。 其具体 工作原理可以参见步骤 101 的第二种实施方式中的生成转速映射表的流程， 在 此不再赘述。
另外， 当控制器通过转动控制装置获取转动装置的转速信息时， 所述转动 控制装置与所述控制器还可以一体设置。 例如： 将转动控制装置和控制器集成 在一块芯片上实现。
综上所述， 本实施例的控制器， 根据预先生成的转速映射表或转速调节信 号获取转动装置的转速信息， 根据转速信息查询预先生成的函数映射表确定与 该转速信息下的目标噪声相适应的传递函数， 然后根据获取的传递函数对参考 传感器反馈的声波信号进行处理， 生成发声命令， 以使次级声源发声装置发出 与目标噪声相位相反、 强度相当的次级声波， 解决了现有技术采用相同传递函 数无法对与获取传递函数时所用目标噪声相差较大的目标噪声进行噪声抵消， 无法实现降噪目的的问题， 降噪处理不再受目标噪声大小的限制， 从真正意义 上实现了降噪。
本领域普通技术人员可以理解： 实现上述方法实施例的全部或部分步骤可 以通过程序指令相关的硬件来完成， 前述的程序可以存储于一计算机可读取存 储介质中， 该程序在执行时， 执行包括上述方法实施例的步骤； 而前述的存储 介质包括： ROM、 RAM, 磁碟或者光盘等各种可以存储程序代码的介质。
最后应说明的是： 以上实施例仅用以说明本发明的技术方案， 而非对其 限制； 尽管参照前述实施例对本发明进行了详细的说明， 本领域的普通技术 人员应当理解： 其依然可以对前述各实施例所记载的技术方案进行修改， 或 者对其中部分技术特征进行等同替换； 而这些修改或者替换， 并不使相应技 术方案的本质脱离本发明各实施例技术方案的精神和范围。

Claims

权 利 要 求
1、 一种转动装置噪声控制方法， 其特征在于， 包括：
获取参考传感器反馈的转动装置产生的噪声的声波信号；
获取所述转动装置的转速信息；
根据所述转速信息， 查询预先生成的函数映射表以获取传递函数； 根据所述传递函数和所述声波信号， 生成发声命令；
将所述发声命令发送给次级声源发声装置， 以使所述次级声源发声装置根 据所述发声命令发出次级声波， 所述次级声波用以抑制所述转动装置产生的噪 声。
2、根据权利要求 1所述的转动装置噪声控制方法， 其特征在于， 所述获取 所述转动装置的转速信息包括：
接收转动控制装置发送的转速调节信号， 所述转速调节信号用以调节所述 转动装置的转速；
根据所述转速调节信号， 获取所述转速信息。
3、根据权利要求 1所述的转动装置噪声控制方法， 其特征在于， 所述获取 所述转动装置的转速信息包括：
根据所述参考传感器反馈的声波信号， 获取所述噪声的信号特征； 根据所述噪声的信号特征， 查询预先生成的转速映射表， 以获取所述转速 信息。
4、 根据权利要求 1或 2或 3所述的转动装置噪声控制方法， 其特征在于， 所述根据所述转速信息，查询预先生成的函数映射表以获取传递函数之前包括： 通过转动控制装置调节所述转动装置的转速信息；
获取每种转速信息对应的传递函数， 以生成所述函数映射表。
5、 根据权利要求 3所述的转动装置噪声控制方法， 其特征在于， 所述根据 所述噪声的信号特征， 查询预先生成的转速映射表， 以获取所述转速信息之前 包括： 通过转动控制装置调节所述转动装置的转速信息；
通过所述参考传感器获取每种转速信息下的噪声的信号特征，以生成所述转 速映射表。
6、根据权利要求 3或 5所述的转动装置噪声控制方法， 其特征在于， 所述 信号特征为信号强度或频媒特性。
7、根据权利要求 1或 2或 3或 5所述的转动装置噪声控制方法， 其特征在 于， 所述转动装置为风扇， 所述转速信息为单位时间内的旋转次数； 或者
所述转动装置为水泵， 所述转速信息为单位时间内的旋转次数。
8、 一种控制器， 其特征在于， 包括：
信号获取模块， 用于获取参考传感器反馈的转动装置产生的噪声的声波信 号；
转速获取模块， 用于获取所述转动装置的转速信息；
查询模块， 用于根据所述转速信息， 查询预先生成的函数映射表以获取传 递函数；
第一生成模块， 用于根据所述传递函数和所述声波信号， 生成发声命令； 发送模块， 用于将所述发声命令发送给次级声源发声装置， 以使所述次级 声源发声装置发出次级声波，所述次级声波用以抑制所述转动装置产生的噪声。
9、 根据权利要求 8所述的控制器， 其特征在于， 所述转速获取模块包括： 接收单元， 用于接收转动控制装置发送的转速调节信号， 所述转动控制装 置通过转速调节信号控制所述转动装置调节转速信息；
第一获取单元， 用于根据所述转速调节信号， 获取所述转速信息。
10、 根据权利要求 8所述的控制器， 其特征在于， 所述转速获取模块包括： 第二获取单元， 用于根据所述参考传感器反馈的声波信号， 获取所述目标 噪声的信号特征；
第三获取单元， 用于根据所述目标噪声的信号特征， 查询预先生成的转速 映射表， 以获取所述转速信息。
11、 根据权利要求 8或 9或 10所述的控制器， 其特征在于， 还包括： 第二生成模块， 用于获取所述转动装置的每种转速信息对应的传递函数， 生成包括所述转速信息和所述转速信息对应的传递函数的所述函数映射表。
12、 根据权利要求 10所述的控制器， 其特征在于， 还包括：
第三生成模块， 用于根据所述参考传感器获取的所述转动装置的每种转速 信息下的噪声的信号特征， 生成包括转速信息和与所述转速信息对应的信号特 征的所述转速映射表。
13、 根据权利要求 9所述的控制器， 其特征在于， 所述转动控制装置与 所述控制器一体设置。
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