CN110972007A - Active earphone noise reduction method suitable for ship high-noise scene - Google Patents
Active earphone noise reduction method suitable for ship high-noise scene Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
- H04R1/1083—Reduction of ambient noise
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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
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1785—Methods, e.g. algorithms; Devices
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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
- G10K11/1787—General system configurations
- G10K11/17879—General system configurations using both a reference signal and an error signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
- H04R1/1008—Earpieces of the supra-aural or circum-aural type
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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
- 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
- G10K2210/1081—Earphones, e.g. for telephones, ear protectors or headsets
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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
- 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
- G10K2210/3026—Feedback
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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
- 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
- G10K2210/3027—Feedforward
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2460/00—Details of hearing devices, i.e. of ear- or headphones covered by H04R1/10 or H04R5/033 but not provided for in any of their subgroups, or of hearing aids covered by H04R25/00 but not provided for in any of its subgroups
- H04R2460/01—Hearing devices using active noise cancellation
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- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The invention discloses a noise reduction method of an active earphone suitable for a ship high-noise scene, and belongs to the technical field of noise reduction earphones. It comprises the following steps: (1) after the feedforward microphone collects environmental sound information, an inverted noise signal, namely a feedforward noise reduction signal is obtained to form a feedforward anti-noise wave; (2) synchronously with the step (1), the feedback microphone collects the audio information at the position close to the ear, and a feedback noise reduction signal is generated to form a feedback anti-noise wave; (3) the function management module receives the feedforward noise reduction signal and the feedback noise reduction signal at the same time, and outputs at least one of the two signals to the moving coil driving unit. The invention realizes an active noise reduction system based on wavelet transformation, feedforward and feedback fusion, can effectively and flexibly adjust the noise reduction mode according to the environment, can well meet the requirement of reducing noise on ships, and can maintain better noise reduction effect in the environment with severe noise change of the ships.
Description
Technical Field
The invention relates to a noise reduction method of an active earphone suitable for a ship high-noise scene, and belongs to the technical field of noise reduction earphones.
Background
A large amount of noise generated by equipment such as a host, a shafting, a propeller and the like on a ship seriously influences the physical health of crews, causes unsmooth communication and has great harm. The above problems can be effectively solved by the noise control technique.
Noise is sound generated by irregular movement of a sounding body, and propagates in a medium in the form of waves. According to the processing mode of sound waves, noise reduction technologies can be divided into a passive noise reduction technology and an active noise reduction technology. Passive noise reduction techniques use sound insulating or absorbing materials to reflect or absorb sound waves of the noise, reducing the noise hazard of the wearer; the active noise reduction technology starts from noise, converts acoustic signals into electric signals through sound-electricity conversion, calculates and obtains signal waveforms with opposite phases, and converts the signals into the acoustic signals through an audio circuit. At the moment, the two sound waves with opposite phases are superposed, so that the amplitude is greatly reduced, and the purpose of noise reduction is achieved.
The common active noise reduction techniques include a feedforward technique and a feedback technique. The feed-forward active noise reduction uses a pickup microphone outside an earphone to collect noise signals of the environment, and the noise signals are converted into anti-noise waves through a loudspeaker after sound-electricity conversion, filtering and phase-inversion processing, so that superposition is completed at the ear of a human body.
The feedback active noise reduction system places a pickup microphone in an earphone, and the system processes an error signal by using a high-speed digital signal processing chip and drives a loudspeaker to emit corresponding anti-noise waves. The feedback system is complex in processing the error signal, and adaptive control algorithms such as LMS are generally used, so that the system has stronger adaptability.
The passive sound insulation earmuffs are mostly used under the high-noise scene of modern ships to ensure the health of personnel, and the sound insulation earmuffs can well reduce the noise of middle and high frequency bands, but due to the limitation of the volume and the weight of the earmuffs, the control on the noise of low frequency bands (below 500 Hz) is not ideal. But also the communication of the person is affected due to the lack of auxiliary electronics.
The active noise reduction technology is in the initial stage of development, and has the defects and shortcomings. The feed-forward active noise reduction system has high requirements on a filter circuit, and the directivity of external noise is very strong, so that the noise reduction requirements of noise in different directions are difficult to meet by using the same circuit. In a feedback type active noise reduction system, the stability and the rapidity of the system are difficult problems, and the ideal rapidity and the following performance under a complicated and variable noise environment are difficult to achieve by a general LMS algorithm.
Therefore, in order to solve the problem of earphone noise reduction in a high-noise scene of a ship, an active earphone noise reduction method suitable for the high-noise scene of the ship is designed, an active noise reduction mode with feedforward and feedback integration is provided, and the earphone noise reduction effect better suitable for the high-noise scene of the ship is achieved.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the active earphone noise reduction method is suitable for a ship high-noise scene, and solves the problem that the noise reduction effect is not ideal due to the fact that a single noise reduction mode is adopted by the existing noise reduction earphone.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
an active noise reduction earphone suitable for a ship high-noise scene comprises a headset, an audio acquisition module and a noise reduction control module;
the headset comprises a moving coil driving unit fixed in the sound-insulation earmuffs and an audio processing chip connected with the moving coil driving unit, and is used for passive noise reduction and audio signal playing;
the audio acquisition module comprises a feedforward microphone, a feedback microphone, a filter circuit for converting a microphone output signal into an audio signal and an analog-to-digital conversion circuit; the feedforward microphone is arranged outside the sound insulation earmuff and used for collecting environmental noise; the feedback microphone is arranged in front of the moving coil driving unit and used for acquiring an error noise signal, and the audio acquisition module is used for acquiring environmental noise and outputting a feedforward audio signal and a feedback audio signal;
and the noise reduction control module is composed of a high-speed DSP processor on hardware and used for processing noise signals, controlling the moving coil driving unit to simulate anti-noise waves and finishing a noise reduction task.
The sound insulation earmuffs can effectively reduce the intensity of high-frequency noise on the ship; for low-frequency noise (below 500 Hz) with strong penetration capacity, the active noise reduction system reduces the noise intensity by adopting a noise reduction algorithm network with front and feedback fusion.
An active earphone noise reduction method suitable for a ship high-noise scene comprises the following steps:
(1) after the feedforward microphone collects environmental sound information, the environmental sound information is converted into digital signal quantity to generate a feedforward audio signal, wavelet transformation is carried out on the feedforward audio signal by adopting a wavelet denoising algorithm to decompose a noise signal and a non-noise signal, the denoising decomposition result and an original signal are subjected to difference processing to obtain an inverted noise signal, namely a feedforward denoising signal, and the inverted noise signal is input into a moving coil driving unit to form feedforward anti-noise waves;
(2) synchronously with the step (1), the feedback microphone acquires the audio information at the near ear, converts the audio information into digital signal quantity, generates a feedback audio signal, adopts a self-adaptive filter to filter the high-frequency component in the feedback audio signal, multiplies the filtered output signal by an attenuation coefficient α after inverting the phase, generates a feedback noise reduction signal, inputs the feedback noise reduction signal into the moving coil driving unit to form feedback anti-noise waves, and superposes the feedback anti-noise waves and the feedforward anti-noise waves to form total anti-noise waves;
(3) the function management module is connected in front of the moving coil driving unit, receives the feedforward noise reduction signal and the feedback noise reduction signal at the same time, and outputs at least one of the two signals to the moving coil driving unit.
The feedback noise reduction system is easy to generate low-frequency whistle, and meanwhile, the noise reduction effect is not obviously improved under a non-extreme environment, so that a function management module needs to be connected in front of the moving coil driving unit.
As a preferred example, the function management module of step (3) judges whether the noise reduction effect is good or bad according to the specific gravity β (0 ≦ β ≦ 1) of the low frequency component in the feedforward audio signal;
a. when β is smaller than the set value, it shows that the noise reduction effect of the feedforward system is good, and the function management module only outputs the feedforward noise reduction signal to the moving coil driving unit;
b. when β is larger than the set value, it shows that the noise reduction effect of the feedforward system is bad, the function management module outputs the feedforward noise reduction signal and the feedback noise reduction signal to the moving coil driving unit at the same time, and optimizes the noise reduction by adjusting the attenuation coefficient α.
The wavelet transform made by the wavelet de-noising algorithm is an existing transform analysis method, inherits and develops the idea of short-time Fourier transform localization, overcomes the defects that the window size does not change along with the frequency and the like, can provide a time-frequency window changing along with the frequency, and is an ideal tool for signal time-frequency analysis and processing.
The basic flow of the existing wavelet transform algorithm is as follows:
1) selecting a proper wavelet function and a proper scaling function according to an input discrete feedforward audio signal, and calculating coefficients c and d from the existing signal in a reverse mode; 2) carrying out corresponding processing on the coefficients; 3) reconstructing the signal from the processed coefficients, separating the noise signal from the non-noise signal, and retaining only the non-noise signal.
The wavelet transform is a local transform of time and frequency domains, so that information can be effectively extracted from the audio signal, and multi-scale fine analysis is carried out on the audio signal through operation functions such as stretching and translation. Aiming at the background noise with wide frequency band and high intensity existing in the ship, compared with the traditional Fourier transform, the method can better separate noise and non-noise signals, thereby completing the task of noise compensation.
The invention has the beneficial effects that:
(1) the invention realizes an active noise reduction system based on wavelet transformation, feedforward and feedback fusion, can effectively flexibly adjust the noise reduction mode according to the environment, can well meet the requirement of reducing noise on ships, applies the wavelet transformation algorithm to the field of earphone noise reduction, has the characteristic of fast convergence compared with the traditional LMS algorithm, and can maintain better noise reduction effect in the environment with severe noise change of ships;
(2) the function management module can well ensure the matching between the feedforward noise reduction system and the feedback noise reduction system, flexibly adjust the attenuation coefficient α according to the noise reduction condition of the use environment, and achieve better feedback compensation effect.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
In order to make the technical means, the original characteristics, the achieved purpose and the efficacy of the invention easy to understand, the invention is further described with reference to the specific drawings.
As shown in fig. 1, an active headset noise reduction method suitable for a ship high-noise scene includes the following steps:
(1) after the feedforward microphone collects environmental sound information, the environmental sound information is converted into digital signal quantity to generate a feedforward audio signal, wavelet transformation is carried out on the feedforward audio signal by adopting a wavelet denoising algorithm to decompose a noise signal and a non-noise signal, the denoising decomposition result and an original signal are subjected to difference processing to obtain an inverted noise signal, namely a feedforward denoising signal, and the inverted noise signal is input into a moving coil driving unit to form feedforward anti-noise waves;
(2) synchronously with the step (1), the feedback microphone acquires the audio information at the near ear, converts the audio information into digital signal quantity, generates a feedback audio signal, adopts a self-adaptive filter to filter the high-frequency component in the feedback audio signal, multiplies the filtered output signal by an attenuation coefficient α after inverting the phase, generates a feedback noise reduction signal, inputs the feedback noise reduction signal into the moving coil driving unit to form feedback anti-noise waves, and superposes the feedback anti-noise waves and the feedforward anti-noise waves to form total anti-noise waves;
(3) the function management module is connected in front of the moving coil driving unit, receives the feedforward noise reduction signal and the feedback noise reduction signal at the same time, and outputs at least one of the two signals to the moving coil driving unit.
The function management module in the step (3) judges whether the noise reduction effect is good or bad according to the specific gravity β (0 is more than or equal to β is more than or equal to 1) of the low-frequency components in the feedforward audio signal;
a. when β is smaller than the set value, it shows that the noise reduction effect of the feedforward system is good, and the function management module only outputs the feedforward noise reduction signal to the moving coil driving unit;
b. when β is larger than the set value, it shows that the noise reduction effect of the feedforward system is bad, the function management module outputs the feedforward noise reduction signal and the feedback noise reduction signal to the moving coil driving unit at the same time, and optimizes the noise reduction by adjusting the attenuation coefficient α.
In fig. 1, the input of the function management module is a feedback noise reduction signal, a feedforward noise reduction signal, and a feedforward audio signal, and the three signals are used to provide a feedback anti-noise wave, a feedforward anti-noise wave, and calculate β values.
Example 1
The function management module judges whether the noise reduction effect is good or bad according to the specific gravity β (0 is more than or equal to β is more than or equal to 1) of the low-frequency components in the feedforward audio signal;
a. when β is less than 0.5, the noise reduction effect of the feedforward system is good, and the function management module only outputs a feedforward noise reduction signal to the moving coil driving unit;
b. when β is larger than 0.5, the noise reduction effect of the feedforward system is poor, the function management module outputs a feedforward noise reduction signal and a feedback noise reduction signal to the moving coil driving unit at the same time, and noise reduction is optimized by manually adjusting an attenuation coefficient α.
Example 2
The function management module judges whether the noise reduction effect is good or bad according to the specific gravity β (0 is more than or equal to β is more than or equal to 1) of the low-frequency components in the feedforward audio signal;
a. when β is less than 0.3, the noise reduction effect of the feedforward system is good, and the function management module only outputs a feedforward noise reduction signal to the moving coil driving unit;
b. when β is larger than 0.3, the noise reduction effect of the feedforward system is poor, the function management module outputs a feedforward noise reduction signal and a feedback noise reduction signal to the moving coil driving unit at the same time, and noise reduction is optimized by manually adjusting an attenuation coefficient α.
Example 3
The function management module judges whether the noise reduction effect is good or bad according to the specific gravity β (0 is more than or equal to β is more than or equal to 1) of the low-frequency components in the feedforward audio signal;
a. when β is less than 0.01, the noise reduction effect of the feedforward system is good, and the function management module only outputs a feedforward noise reduction signal to the moving coil driving unit;
b. when β is larger than 0.01, the noise reduction effect of the feedforward system is poor, the function management module outputs a feedforward noise reduction signal and a feedback noise reduction signal to the moving coil driving unit at the same time, and noise reduction is optimized by manually adjusting an attenuation coefficient α.
The invention realizes an active noise reduction system based on wavelet transformation, feedforward and feedback fusion, can effectively flexibly adjust the noise reduction mode according to the environment, can well meet the requirement of reducing noise on ships, applies the wavelet transformation algorithm to the field of earphone noise reduction, has the characteristic of fast convergence compared with the traditional LMS algorithm, can maintain better noise reduction effect in the environment with severe noise change of ships, can well ensure the cooperation between the feedforward noise reduction system and the feedback noise reduction system by the function management module, flexibly adjusts the attenuation coefficient α according to the noise reduction condition of the using environment, and can achieve better feedback compensation effect.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (2)
1. An active earphone noise reduction method suitable for a ship high-noise scene is characterized by comprising the following steps:
(1) after the feedforward microphone collects environmental sound information, the environmental sound information is converted into digital signal quantity to generate a feedforward audio signal, wavelet transformation is carried out on the feedforward audio signal by adopting a wavelet denoising algorithm to decompose a noise signal and a non-noise signal, the denoising decomposition result and an original signal are subjected to difference processing to obtain an inverted noise signal, namely a feedforward denoising signal, and the inverted noise signal is input into a moving coil driving unit to form feedforward anti-noise waves;
(2) synchronously with the step (1), the feedback microphone acquires the audio information at the near ear, converts the audio information into digital signal quantity, generates a feedback audio signal, adopts a self-adaptive filter to filter the high-frequency component in the feedback audio signal, multiplies the filtered output signal by an attenuation coefficient α after inverting the phase, generates a feedback noise reduction signal, inputs the feedback noise reduction signal into the moving coil driving unit to form feedback anti-noise waves, and superposes the feedback anti-noise waves and the feedforward anti-noise waves to form total anti-noise waves;
(3) the function management module is connected in front of the moving coil driving unit, receives the feedforward noise reduction signal and the feedback noise reduction signal at the same time, and outputs at least one of the two signals to the moving coil driving unit.
2. The active headset noise reduction method applied to the high-noise scenes of ships and warships according to claim 1, wherein the function management module of step (3) determines whether the noise reduction effect is good or bad according to the specific gravity β (0 ≦ β ≦ 1) of the low-frequency components in the feedforward audio signal;
a. when β is smaller than the set value, it shows that the noise reduction effect of the feedforward system is good, and the function management module only outputs the feedforward noise reduction signal to the moving coil driving unit;
b. when β is larger than the set value, it shows that the noise reduction effect of the feedforward system is bad, the function management module outputs the feedforward noise reduction signal and the feedback noise reduction signal to the moving coil driving unit at the same time, and optimizes the noise reduction by adjusting the attenuation coefficient α.
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| CN113556654A (en) * | 2021-07-16 | 2021-10-26 | RealMe重庆移动通信有限公司 | Audio data processing method and device and electronic equipment |
| CN113556654B (en) * | 2021-07-16 | 2022-11-22 | RealMe重庆移动通信有限公司 | Audio data processing method and device and electronic equipment |
| WO2023138252A1 (en) * | 2022-01-24 | 2023-07-27 | Oppo广东移动通信有限公司 | Audio signal processing method and apparatus, earphone device, and storage medium |
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