CN109616133B - Environmental noise removing system - Google Patents
Environmental noise removing system Download PDFInfo
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- CN109616133B CN109616133B CN201811142872.6A CN201811142872A CN109616133B CN 109616133 B CN109616133 B CN 109616133B CN 201811142872 A CN201811142872 A CN 201811142872A CN 109616133 B CN109616133 B CN 109616133B
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Processing of the speech or voice signal 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
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
- G10L25/78—Detection of presence or absence of voice signals
- G10L25/84—Detection of presence or absence of voice signals for discriminating voice from noise
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
- G10L25/78—Detection of presence or absence of voice signals
- G10L25/87—Detection of discrete points within a voice signal
Abstract
The invention provides an environmental noise removing system, comprising: the capturing module is used for capturing a first sound frame of the voice playing signal and a second sound frame of a previous frame of the first sound frame; the detection module is used for detecting a high-frequency area, a low-frequency area and an overlapping area of the first sound frame, and determining a corresponding frame type in the first sound frame and different frame addresses corresponding to different frame types; the filtering module is used for filtering the first sound frame to obtain a filtering coefficient; the determining module is used for determining whether a sound signal exists in the first sound frame, calculating a noise estimation value of the second sound frame when the sound signal exists, and taking the noise estimation value of the second sound frame as a noise estimation reference value of the first sound frame; the processing module is used for obtaining attenuation noise by calculation according to the frame type, the filter coefficient and the noise estimation reference value, processing the first audio frequency through a filter algorithm and obtaining a denoised signal, and improving the experience effect of a user by solving the problem of noise accompanying the audio frequency.
Description
Technical Field
The invention relates to the technical field of noise elimination, in particular to an environmental noise removing system.
Background
At present, with the wide application of electronic technology, people are more and more accustomed to playing or making calls to audio and video by using an intelligent machine, but in the process of playing or making calls to audio and video, a certain syllable may be broken or a plurality of syllables may be overlapped in a certain time period, and noise accompanied by audio in the intelligent machine may bring negative effects to the use of the intelligent machine by a user, so that the user cannot well experience the effect brought by the audio.
Disclosure of Invention
The invention provides an environmental noise removing system which is used for solving the problem of noise accompanying audio frequency and improving the experience effect of a user.
To achieve the above object, the present invention provides an ambient noise removing system, comprising:
the capturing module is used for capturing a first sound frame of the voice playing signal and a second sound frame of a previous frame of the first sound frame;
the detection module is used for detecting a high-frequency area, a low-frequency area and an overlapping area of a first sound frame, determining a corresponding frame type in the first sound frame and different frame addresses corresponding to different frame types, wherein the frame types comprise: speech frames, noise frames, sub-speech frames, sub-noise frames;
the filtering module is used for filtering the first sound frame to obtain a filtering coefficient;
the determining module is used for determining whether a sound signal exists in the first sound frame, calculating a noise estimation value of the second sound frame when the sound signal exists, and taking the noise estimation value of the second sound frame as a noise estimation reference value of the first sound frame;
and the processing module is used for obtaining attenuation noise by calculation according to the frame type, the filter coefficient and the noise estimation reference value, processing the first audio frequency through a filter algorithm and obtaining a denoised signal.
In one possible implementation, the capturing module includes:
the acquisition unit is used for acquiring energy corresponding to each frequency sampling point in the first sound frame;
a detection module comprising:
the first judging unit is used for judging the frame type corresponding to the first voice frame, judging the current first voice frame as a voice frame when the energy of the frequency sampling point is in a first threshold value, and calibrating a first position corresponding to the voice frame; when the energy of the frequency sampling point is in a second threshold value, judging that the current first sound frame is a noise frame, and calibrating a second position corresponding to the noise frame; when the energy of the frequency sampling point is in a third threshold value, judging that the current first voice frame is a sub-voice frame, and calibrating a third position corresponding to the sub-voice frame; and when the energy of the frequency sampling point is in a fourth threshold value, judging that the current first sound frame is a secondary noise frame, and calibrating a fourth position corresponding to the secondary noise frame.
In one possible implementation, the detection module includes:
the storage unit is used for storing a high-frequency area and a low-frequency area corresponding to the frequency sampling points in the first sound frame, carrying out sampling numbering according to the sequence of the captured voice playing signals, and storing the lengths corresponding to the sampling points and the sampling numbers corresponding to the sampling points, wherein the lengths are storage spaces occupied by the sampling points;
the second judgment unit is used for judging whether the sampling point is in a preset frequency range or not, acquiring the length corresponding to the sampling point and the sampling number corresponding to the sampling point when the frequency corresponding to the sampling point exceeds the preset frequency range, and calculating to obtain an interference phase through the processing module;
comparing and obtaining a maximum value corresponding to the high-frequency area and a minimum value corresponding to the low-frequency area according to the second judgment unit;
and the processing unit is also used for calculating to obtain the amplitude of the interference signal according to the maximum value and the minimum value point.
In one possible implementation, the frame type of the first voice frame is any one or combination of voice frames, noise frames, sub-voice frames, and sub-noise frames.
In one possible implementation manner, the method further includes:
at least two acoustic sensors, including at least one first acoustic sensor and at least one second acoustic sensor, for receiving audio signals from outside the acoustic sensors;
the processing module is further configured to process a first audio signal acquired by the first acoustic sensor, and subtract a second audio signal acquired by the second acoustic sensor to obtain a third audio signal;
the third judging unit is used for judging whether the sound waves of the first audio signal and the second audio signal have time delay or not, when the sound waves of the first audio signal and the second audio signal have time delay, the first audio signal and the second audio signal are subjected to signal synchronization comparison, and a common signal obtained after time delay is a third audio signal; the time delay is a time difference formed by distance difference in the sound transmission process in the main control direction and the non-main control direction;
the first audio signal is a sound signal with noise emitted from a main control direction, the second audio signal is a noise signal emitted from a non-main control direction, and the third audio signal is a sound signal obtained by denoising the first audio signal.
In one possible implementation, the acoustic sensor is further configured to detect a discharge condition of a device in the circuit, the acoustic sensor including: the device comprises an ultrasonic sensor, a sound pressure sensor and a surface acoustic wave sensor, wherein the discharge condition is obtained by a detection device in a detection module;
the detection device comprises: a copper plate 101 which is half wrapped on the detection device, and an ultrasonic sensor 103 which is fixed on the inner side of the copper plate 101 through an adjustable screw 102; the ultrasound sensor comprises an antenna 1021 and a passive coax 1022; the top end of the screw 102 is fixed on the insulation area of the antenna 1021, and the bottom end is connected with the copper plate 101; the copper plate 101 is connected with the detection device; the conductive body 1023 of the antenna 1021 is connected with the screws 102 adjacent to the conductive body;
the conductive body of the antenna 1021 is connected with the adjacent screw 102 through the signal line 1026, one end of the signal line 1026 is connected to the end of one antenna conductive body 1023, and the other end is connected to the adjacent screw 102; the antenna 1021 is not intersected with the inner surface of the detection device; the antenna 1021 and the copper plate 101 are fixedly connected through a screw 102, and the length of the screw 102 is determined according to the position depth of the ultrasonic sensor 103 in the detection device; a passive coaxial device 1022 in the ultrasonic sensor 103 is attached to the lower surface of the antenna 1021, a first through hole 1027 is formed in the upper surface of the antenna 1021, and a signal line 1026 penetrates through the first through hole 1027;
a protrusion 1028 is arranged at one end of the passive coaxial connector 1022, the length of the protrusion 1028 is slightly larger than the thickness of the antenna 1021, the size of the protrusion 1028 is matched with the first through hole 1027 and is arranged in the first through hole 1027, and the conductive part of the protrusion 1028 exposed on the front surface of the antenna 1021 is welded with the antenna conductive body 1023 on the front surface of the antenna 1021; a passive coax 1022 is attached to the back of the antenna 1021; a conductive strip 1030 connected with the antenna conductive body 1023 is covered on the inner wall of the first through hole 1027, and the conductive strip 1030 is in contact with the conductive part of the protrusion 1028;
the ultrasonic sensor 103 further comprises a connector 1031, one end of the connector is arranged on a corresponding interface of the passive coaxial connector 1022, and the connector 1031 is embedded in the copper plate 101;
the passive coaxial device 1022 is fixedly connected with the lower surface of the antenna 102; an annular groove 1011 is arranged on the copper plate 101, and an annular pad is arranged in the annular groove 1011; the insulating area of the antenna 1021 is provided with a second through hole 1031, the top end of the screw 102 is fixedly connected with the antenna 1021 through the second through hole 1031, the bottom end of the screw 102 is fixed in a mounting hole corresponding to the position of the second through hole 1031 in the copper plate 101, the screw 102 fixes the detection device through the mounting hole, wherein the mounting hole is of a zh circular structure, the roughness of the inner surface of the circular structure is smaller than Ra1.0, and a ring pad corresponding to the connector is arranged on the inner side of the copper plate 101.
In one possible implementation, the noise reduction device further includes a mechanical noise reduction device, and the mechanical noise reduction device includes: an upper noise reduction body 01, a middle connecting layer 02 and a bottom noise reduction plate 03,
wherein, the upper denoising body 01 includes: the denoising device comprises a denoising container 001, a denoising medium 002 and an air pump 003, wherein a reserved space is arranged in the denoising container 001, the denoising medium 002 is placed in the reserved space, the denoising medium 002 comprises one or more of absorbing particles, absorbing powder or absorbing fluid, the air pump 003 is connected with an air pipe 004, the denoising container 001 wraps the air pipe 004, noise generated by the air pump 003 is transmitted out through the air pipe 004 and the denoising medium 002, vibration is generated when the upper denoising body 001 obtains external sound, the denoising container 001 and the denoising medium 002 absorb and block vibration generated by the upper denoising body 001 at the same time, the denoising container 001 is made of a flexible material, and the flexible material comprises a rubber material, a nylon material and a cotton wool fabric material;
the denoising container 001 is internally provided with n1 isolation components 005, the isolation components 005 divide the denoising container 001 into n2 mutually independent small spaces, the isolation components 005 are flaky and are arranged in the denoising container 001 in a transverse and longitudinal crossed arrangement sequence, each mutually independent small space is provided with a denoising medium 002, a gap is reserved in the small space provided with the denoising medium 002, the denoising medium 002 is uniformly arranged in the small space, the small spaces are arranged into n3 layers along the sound transmission direction, and the upper denoising body 01 is arranged above the bottom denoising plate 03;
wherein, the bottom noise reduction plate 03 is provided with a cylinder 031, a lever 032, an iron disc (base) 033, a spring 034, a support rod 035 and a lantern ring 036, the iron disc 033 is fixed on the ground surface, the outside of the iron disc 033 is wrapped with a polypropylene material, the lower end of the lever 032 is mounted on the iron disc 033 through the lantern ring 036, the upper side of the lever 032 is of a hemispherical convex-surface tubular structure, the lower end of the lever 032 is pressed on the iron disc 033, the lantern ring 036 is arranged between the support rod 035 and the inner wall of the lever 032, the cylinder 031 is of a cylindrical structure with a closed upper end, the inner surface of the cylinder 031 is provided with a semicircular convex surface, the upper end of the lever 032 extends into the cylindrical structure in the cylinder 031, the spring 034 is arranged on the upper end of the support rod 035, the spring 034 is arranged on the lower surface of the closed end of the cylinder 031 and on the convex surface of the lever 032, and the electric wires arranged in the upper end 035 and connected with the air pump 003 in the upper noise reduction body 01;
be equipped with through-hole 021 on middle part articulamentum 02, the electric wire is connected with air pump 003 through the through-hole, and middle articulamentum 02 is the board of cuboid shape, and inside is empty groove 022, and empty groove 022 places the annular medium 002 of removing noise of coiling.
Wherein the mechanical noise reduction device is used for reducing the noise of the machine.
The method mainly comprises the steps of capturing a high-frequency area, a low-frequency area and an overlapping area appearing in the audio frequency, judging frame types corresponding to the three areas, obtaining attenuation noise through the frame types, the filter coefficients and the noise estimation reference values, and obtaining a denoised signal through processing of a filter algorithm, so that the problem of noise appearing in the audio frequency can be relieved, and the experience effect of a user can be improved.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a block diagram of an environmental noise removal system according to an embodiment of the present invention;
FIG. 2 is a flowchart of a recursive averaging algorithm for minimum control in an embodiment of the present invention;
FIG. 3 is a block diagram of a detecting device according to an embodiment of the present invention;
FIG. 4 is a block diagram of a mechanical noise reduction apparatus in an embodiment of the present invention;
FIG. 5 is a schematic diagram of an upper denoising body structure in an embodiment of the present invention;
fig. 6 is a schematic diagram of a bottom noise reduction plate structure according to an embodiment of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
An embodiment of the present invention provides an environmental noise removing system, as shown in fig. 1, including:
the capturing module 1 is used for capturing a first sound frame of a voice playing signal and a second sound frame of a previous frame of the first sound frame;
the detection module 2 is configured to detect a high-frequency region, a low-frequency region, and an overlapping region of a first audio frame, and determine a frame type corresponding to the first audio frame and different frame addresses corresponding to different frame types, where the frame types include: speech frames, noise frames, sub-speech frames, sub-noise frames;
the filtering module 3 is used for filtering the first sound frame to obtain a filtering coefficient;
the determining module 4 is used for determining whether a sound signal exists in the first sound frame, calculating a noise estimation value of the second sound frame when the sound signal exists, and using the noise estimation value of the second sound frame as a noise estimation reference value of the first sound frame;
the processing module 5 is used for obtaining attenuation noise by calculation according to the frame type, the filter coefficient and the noise estimation reference value, processing the first audio frequency through a filter algorithm and obtaining a denoised signal;
preferably, the frame type of the first voice frame is any one or combination of voice frame, noise frame, sub-voice frame and sub-noise frame.
For determining whether there is a sound signal in the first sound frame, for example, a VAD (Voice Activity Detection) algorithm may be used, where the VAD algorithm includes but is not limited to: the method has the advantages of improving the recognition of the sound signals existing in the sound frames by using a frame amplitude algorithm, a frame energy algorithm, a short-time zero-crossing rate analysis algorithm, an energy and sliding window algorithm, a neural network algorithm and the like.
The above-mentioned algorithm for the noise estimation value can be, for example, a recursive average algorithm of minimum control, as shown in fig. 2, see step 201 and 203:
it should be noted that the minimum value in step 201 is a preliminary estimate of the noise.
Step 202: calculating the probability p of the existence of the voice through the minimum value obtained in step 201;
step 203: calculating a smoothing factor of the noise estimate according to the formula p (λ, k) ═ p (Hk1| Y (λ, k)) p (λ, k) ═ p (Hk1| Y (λ, k));
it should be noted that, when the probability P is not less than 0.5, the smoothing factor is made to approach 1, i.e. the noise estimation value of the previous frame is used as the noise estimation value of the current frame, and when the probability P is less than 0.5, the smoothing factor is made to approach 0, i.e. the noise estimation is performed by using the power of the current frame;
wherein, λ represents the frame number, k represents the frequency point index, Y represents the noisy speech spectrum in the frequency domain, and P represents the frequency.
Step 204: and estimating the noise by recursive averaging according to the minimum value, the probability P and the smooth silver obtained in the step.
The technical scheme has the beneficial effects that: the high-frequency region, the low-frequency region and the overlapping region existing in the first sound frame are judged through detection of the first sound frame, the frame type corresponding to the first sound frame is determined, accuracy of frame detection is improved, noise appearing in audio can be effectively processed according to the frame type, running speed of a machine is improved, the problem of noise appearing in the audio is relieved, and meanwhile experience effect of a user is improved.
The embodiment of the invention provides an environmental noise removing system, wherein a capturing module comprises:
the acquisition unit is used for acquiring energy corresponding to each frequency sampling point in the first sound frame;
a detection module comprising: the first judging unit is used for judging the frame type corresponding to the first voice frame, judging the current first voice frame as a voice frame when the energy of the frequency sampling point is in a first threshold value, and calibrating a first position corresponding to the voice frame; when the energy of the frequency sampling point is in a second threshold value, judging that the current first sound frame is a noise frame, and calibrating a second position corresponding to the noise frame; when the energy of the frequency sampling point is in a third threshold value, judging that the current first voice frame is a sub-voice frame, and calibrating a third position corresponding to the sub-voice frame; and when the energy of the frequency sampling point is in a fourth threshold value, judging that the current first sound frame is a secondary noise frame, and calibrating a fourth position corresponding to the secondary noise frame.
The principle of audio sampling is: sound is actually an energy wave, and therefore also has characteristics of frequency and amplitude, the frequency corresponds to the time axis, the amplitude corresponds to the level axis, since the wave is infinitely smooth, the string can be regarded as being composed of countless points, since the storage space is relatively limited, in the digital encoding process, the points of the string must be sampled, wherein the sampling process is to extract the frequency value of a certain point and obtain the energy corresponding to the point. The method has the advantages that the state of the current frame can be effectively judged through sampling the audio, and the frame type corresponding to the current frame can be known in time through comparison of the threshold values.
For example, normalizing the energy of the sampling points corresponding to different frame types to obtain corresponding decibel values, assuming that when the decibel is greater than 500 decibel, the frame is judged to be a noise frame, when the decibel is greater than 300 decibel and less than 500 decibel, the frame is judged to be a sub-noise frame, when the decibel is greater than 100 decibel and less than 300 decibel, the frame is judged to be a sub-voice frame, and when the decibel is less than 100 decibel, the frame is judged to be a voice frame. It should be noted that the first threshold is smaller than a third threshold, the third threshold is smaller than a fourth threshold, and the fourth threshold is smaller than the third threshold.
The technical scheme has the beneficial effects that: the frame type corresponding to the frame is obtained by comparing the threshold value of the acquired energy, so that the audio recognition speed is accelerated, and the processing efficiency of the noise in the audio is improved.
The embodiment of the invention provides an environmental noise removing system, and a detection module comprises:
the storage unit is used for storing a high-frequency area and a low-frequency area corresponding to the frequency sampling points in the first sound frame, carrying out sampling numbering according to the sequence of the captured voice playing signals, and storing the lengths corresponding to the sampling points and the sampling numbers corresponding to the sampling points, wherein the lengths are storage spaces occupied by the sampling points;
the second judgment unit is used for judging whether the sampling point is in a preset frequency range or not, acquiring the length corresponding to the sampling point and the sampling number corresponding to the sampling point when the frequency corresponding to the sampling point exceeds the preset frequency range, and calculating to obtain an interference phase through the processing module;
comparing and obtaining a maximum value corresponding to the high-frequency area and a minimum value corresponding to the low-frequency area according to the second judgment unit;
and the processing unit is also used for calculating to obtain the amplitude of the interference signal according to the maximum value and the minimum value point.
The sampling points occupy storage space because the sampling system allocates certain storage positions to express the sound wave amplitude state of the sound wave, for example, assuming that 8 times of sampling is performed on one sound wave, the energy values corresponding to the sampling points are respectively A1-A8, but if the sampling space size of 2 bits is used, the result can only keep the values of the first 4 points in A1-A8, and if the sampling space size of 3 bits is used, all information of 8 points can be recorded, wherein the larger the values of the sampling rate and the sampling space size are, the closer the recorded sound waveform is to the original signal, and the advantage is that by setting a larger storage space, not only more data can be stored, but also the sampling precision becomes higher, and the audio reproduction rate is improved.
The technical scheme has the advantages that more sampling points can be obtained by setting larger storage bits, the audio frequency restoration rate is improved while the sampling precision is improved, the amplitude and the phase of an interference signal are obtained by sampling calculation of the sampling points, the interference signal in an original signal can be effectively removed, and the accuracy of obtaining a pure voice signal is improved.
The embodiment of the invention provides an environmental noise removing system, which further comprises:
at least two acoustic sensors, including at least one first acoustic sensor and at least one second acoustic sensor, for receiving audio signals from outside the acoustic sensors;
the processing module is further configured to process a first audio signal acquired by the first acoustic sensor, and subtract a second audio signal acquired by the second acoustic sensor to obtain a third audio signal;
the third judging unit is used for judging whether the sound waves of the first audio signal and the second audio signal have time delay or not, when the sound waves of the first audio signal and the second audio signal have time delay, the first audio signal and the second audio signal are subjected to signal synchronization comparison, and a common signal obtained after time delay is a third audio signal; the time delay is a time difference formed by distance difference in the sound transmission process in the main control direction and the non-main control direction;
the first audio signal is a sound signal with noise emitted from a main control direction, the second audio signal is a noise signal emitted from a non-main control direction, and the third audio signal is a sound signal obtained by denoising the first audio signal.
For the time delay, for example, the time delay caused by matching vocal cord vibration is adopted, firstly, the acquisition module is arranged at a first position where vocal cord vibration can be acquired, then the vocal cord vibration of the neck is taken as a blue book, and the first voice data of the acquisition module is matched in the voice signal of the first acoustic sensor in the main fixed direction; and then the acquisition module is arranged at a second position where vocal cord vibration can be acquired, and then the vocal cord vibration of the neck is used as a blue book, and second voice data of the acquisition module is matched in the voice signal of the first acoustic sensor in the main fixed direction. The distance between the acquisition device and the vocal cord vibration is 2-4mm at the first position, the distance between the acquisition device and the vocal cord vibration is 7-9mm at the second position, the first voice data obtained at the first position is compared with the second voice data obtained at the second position, voice delay can occur, and it needs to be explained that the first voice data is standard data.
The technical scheme has the beneficial effects that: the third audio signal is obtained by subtracting the obtained second audio signal from the obtained first audio signal, so that the sound independently emitted from the main control direction can be accurately obtained under the complex condition.
The embodiment of the invention provides an environmental noise removing system, wherein an acoustic sensor is also used for detecting the discharge condition of a device in a circuit, and comprises: the device comprises an ultrasonic sensor, a sound pressure sensor and a surface acoustic wave sensor, wherein the discharge condition is obtained by a detection device in a detection module;
the detection device comprises: a copper plate 101 which is half wrapped on the detection device, and an ultrasonic sensor 103 which is fixed on the inner side of the copper plate 101 through an adjustable screw 102; the ultrasound sensor comprises an antenna 1021 and a passive coax 1022; the top end of the screw 102 is fixed on the insulation area of the antenna 1021, and the bottom end is connected with the copper plate 101; the copper plate 101 is connected with the detection device; the conductive body 1023 of the antenna 1021 is connected to the adjacent screws 102;
the conductive body 1023 of the antenna 1021 is connected with the adjacent screw 102 through the signal line 1026, one end of the signal line 1026 is connected with the tail end of one antenna conductive body 1023, and the other end is connected with the adjacent screw 102; the antenna 1021 is not intersected with the inner surface of the detection device; the antenna 1021 and the copper plate 101 are fixedly connected through a screw 102, and the length of the screw 102 is determined according to the position depth of the ultrasonic sensor 103 in the detection device; a passive coaxial device 1022 in the ultrasonic sensor 103 is attached to the lower surface of the antenna 1021, a first through hole 1027 is formed in the upper surface of the antenna 1021, and a signal line 1026 penetrates through the first through hole 1027;
a protrusion 1028 is arranged at one end of the passive coaxial connector 1022, the length of the protrusion 1028 is slightly larger than the thickness of the antenna 1021, the size of the protrusion 1028 is matched with the first through hole 1027 and is arranged in the first through hole 1027, and a conductive part of the protrusion 1028 exposed on the front surface of the antenna 1021 is welded with the antenna conductive body 1023 on the front surface of the antenna 1021; a passive coax 1022 is attached to the back of the antenna 1021; a conductive strip 1030 connected with the antenna conductive body 1023 is coated on the inner wall of the first through hole 1027, and the conductive strip 1030 is in contact with the conductive part of the protrusion 1028;
the ultrasonic sensor 103 further comprises a connector 1031, one end of the connector is arranged on a corresponding interface of the passive coaxial connector 1022, and the connector 1031 is embedded in the copper plate 101;
the passive coaxial device 1022 is fixedly connected with the lower surface of the antenna 102; an annular groove 1011 is arranged on the copper plate 101, and an annular pad is arranged in the annular groove 1011; the insulating area of the antenna 1021 is provided with a second through hole 1031, the top end of the screw 102 is fixedly connected with the antenna 1021 through the second through hole 1031, the bottom end of the screw 102 is fixed in a mounting hole corresponding to the position of the second through hole 1031 on the copper plate 101, the screw 102 fixes the detection device through the mounting hole, wherein the mounting hole is of a circular structure, the roughness of the inner surface of the circular structure is smaller than Ra1.0, and a ring pad corresponding to the connector is arranged on the inner side of the copper plate 101.
It should be noted that the bottom end of the screw is provided with a non-conductive gasket, so that the bottom end of the screw and the ring pad are in an isolated state; the conductive part of the bulge exposed on the front surface of the antenna is welded with the antenna conductive body on the front surface of the antenna, so that the key of ensuring the conduction is realized, wherein the conductive belt is in contact with the conductive part of the bulge, and the purpose of ensuring the circuit conduction can be realized by one more layer; meanwhile, the passive coaxial device is connected with the antenna through the hot melt adhesive, so that the connection stability of the passive coaxial device and the antenna can be improved.
The technical scheme has the beneficial effects that: this technical scheme uses the screw fixation, has strengthened the steadiness of machinery itself, can make detection device's low frequency lower limit obtain effectual reduction through ultrasonic sensor, and the low frequency section characteristic is well improved.
The embodiment of the invention provides an environmental noise removing system, which further comprises a mechanical noise reduction device, as shown in fig. 4, the mechanical noise reduction device comprises: an upper noise reduction body 01, a middle connecting layer 02 and a bottom noise reduction plate 03,
as shown in fig. 5, the upper denoising body 01 includes: the denoising device comprises a denoising container 001, a denoising medium 002 and an air pump 003, wherein a reserved space is arranged in the denoising container 001, the denoising medium 002 is placed in the reserved space, the denoising medium 002 comprises one or more of absorbing particles, absorbing powder or absorbing fluid, the air pump 003 is connected with an air pipe 004, the denoising container 001 wraps the air pipe 004, noise generated by the air pump 003 is transmitted out through the air pipe 004 and the denoising medium 002, vibration is generated when the upper denoising body 001 obtains external sound, the denoising container 001 and the denoising medium 002 absorb and block vibration generated by the upper denoising body 001 at the same time, the denoising container 001 is made of a flexible material, and the flexible material comprises a rubber material, a nylon material and a cotton wool fabric material;
the denoising container 001 is internally provided with n1 isolation components 005, the isolation components 005 divide the denoising container 001 into n2 mutually independent small spaces, the isolation components 005 are flaky and are arranged in the denoising container 001 in a transverse and longitudinal crossed arrangement sequence, each mutually independent small space is provided with a denoising medium 002, a gap is reserved in the small space provided with the denoising medium 002, the denoising medium 002 is uniformly arranged in the small space, the small spaces are arranged into n3 layers along the sound transmission direction, and the upper denoising body 01 is arranged above the bottom denoising plate 03;
wherein, the bottom noise reduction plate 03 is provided with a cylinder 031, a lever 032, an iron disc (base) 033, a spring 034, a support rod 035 and a lantern ring 036, the iron disc 033 is fixed on the ground surface, the outside of the iron disc 033 is wrapped with a polypropylene material, the lower end of the lever 032 is mounted on the iron disc 033 through the lantern ring 036, the upper side of the lever 032 is of a hemispherical convex-surface tubular structure, the lower end of the lever 032 is pressed on the iron disc 033, the lantern ring 036 is arranged between the support rod 035 and the inner wall of the lever 032, the cylinder 031 is of a cylindrical structure with a closed upper end, the inner surface of the cylinder 031 is provided with a semicircular convex surface, the upper end of the lever 032 extends into the cylindrical structure in the cylinder 031, the spring 034 is arranged on the upper end of the support rod 035, the spring 034 is arranged on the lower surface of the closed end of the cylinder 031 and on the convex surface of the lever 032, and the electric wires arranged in the upper end 035 and connected with the air pump 003 in the upper noise reduction body 01;
be equipped with through-hole 021 on middle part articulamentum 02, the electric wire is connected with air pump 003 through the through-hole, and middle articulamentum 02 is the board of cuboid shape, and inside is empty groove 022, and empty groove 022 places the annular medium 002 of removing noise of coiling.
Preferably, the mechanical noise reduction device is adapted to reduce the noise of the machine itself.
The n1 isolation assemblies divide the denoising container into n2 mutually independent small spaces, so that the arrangement and layout of denoising media are more diversified, and the denoising effect is optimal by filling the denoising media made of different materials aiming at different positions; of course, if the same component denoising medium is arranged in each independent space and the corresponding components are arranged according to the space size, a better denoising effect can be achieved.
The noise removing medium includes a sound absorbing medium for absorbing sound energy and a sound insulating medium for blocking sound propagation. The sound-absorbing medium comprises but is not limited to perlite medium, vermiculite medium and the like, and the length of the sound-absorbing medium is generally 2mm-4 mm; the sound-insulating medium includes, but is not limited to, a rubber medium, a silicone medium, etc., and the length of the sound-insulating medium is generally 2mm to 6 mm.
The technical scheme has the beneficial effects that: the denoising medium and the denoising container can absorb sound generated by vibration of the upper denoising body, so that the noise generated by the upper denoising body is effectively reduced, and noise pollution is reduced;
the denoising container made of flexible materials can better absorb the vibration generated ground sound and better obstruct the propagation of the sound, and the corresponding denoising medium is put into the upper denoising body, the middle connecting layer and the bottom denoising plate, so that the integral noise of the machine can be effectively reduced.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (7)
1. An ambient noise removal system, comprising:
the capturing module is used for capturing a first sound frame of the voice playing signal and a second sound frame of a previous frame of the first sound frame;
the detection module is used for detecting a high-frequency area, a low-frequency area and an overlapping area of a first sound frame, determining a corresponding frame type in the first sound frame and different frame addresses corresponding to different frame types, wherein the frame types comprise: speech frames, noise frames, sub-speech frames, sub-noise frames;
the filtering module is used for filtering the first sound frame to obtain a filtering coefficient;
the determining module is used for determining whether a sound signal exists in the first sound frame, calculating a noise estimation value of the second sound frame when the sound signal exists, and taking the noise estimation value of the second sound frame as a noise estimation reference value of the first sound frame;
the processing module is used for calculating attenuation noise according to the frame type, the filter coefficient and the noise estimation reference value, processing the first sound frame through a filter algorithm and obtaining a denoised signal;
mechanical noise reduction equipment: including the body (01) of making an uproar, middle part articulamentum (02) and bottom fall the board (03) of making an uproar on upper portion, wherein, the body (01) of making an uproar includes on upper portion: the noise removal device comprises a noise removal container (001), a noise removal medium (002), an air pump (003), a reserved space is arranged in the noise removal container (001), the noise removal medium (002) is placed in the reserved space and comprises absorbing particles, absorbing powder or absorbing fluid or a plurality of absorbing particles, the air pump (003) is connected with an air pipe (004), the noise removal container (001) wraps the air pipe (004), noise generated by the air pump (003) is transmitted out through the air pipe (004) and the noise removal medium (002), vibration is generated when the upper noise removal body (001) obtains external sound, the noise removal container (001) and the noise removal medium (002) are absorbed simultaneously at the moment, and the vibration generated by the upper noise removal body (001) is blocked, the noise removal container (001) is made of flexible materials, and the flexible materials comprise rubber materials, nylon materials and cotton wool fabric materials;
n1 isolating components (005) are arranged in the denoising container (001), the denoising container (001) is divided into n2 mutually independent small spaces by the isolating components (005), the isolating components (005) are flaky and are arranged in the denoising container (001) in a transverse and longitudinal crossed arrangement sequence, denoising media (002) are placed in each mutually independent small space, gaps are reserved in the small spaces in which the denoising media (002) are placed, the denoising media (002) are uniformly placed in the small spaces, n3 layers are arranged in the small spaces along the sound transmission direction, and the upper denoising body (01) is arranged above the bottom denoising plate (03);
wherein, the bottom noise reduction plate (03) is provided with a cylinder (031), a lever (032), an iron disc (033), a spring (034), a support rod (035), a lantern ring (036), the iron disc (033) is fixed on the ground surface, the outside of the iron disc (033) is wrapped by a polypropylene material, the lower end of the lever (032) is installed on the iron disc (033) through the lantern ring (036), the upper part of the lever (032) is of a hemispherical convex-surface tubular structure, the lower end of the lever (032) is pressed on the iron disc (033), the lantern ring (036) is arranged between the inner wall of the support rod (035) and the inner wall of the lever (032), the cylinder (031) is of a cylindrical structure with a closed upper end, the inner surface of the cylinder (031) is provided with a semicircular convex surface, the upper end of the lever (032) extends into the cylindrical structure in the cylinder (031), the spring (034) is arranged on the upper part of the support rod (035), the spring (034) is positioned on the lower surface of the closed end of the cylinder (031) and the convex surface of the closed end of the lever (032), the support rod (035) is provided with an electric wire which is connected with an air pump (003) in the upper noise elimination body (01);
be equipped with through-hole (021) on middle part articulamentum (02), the electric wire is connected with air pump (003) through the through-hole, and middle articulamentum (02) are the board of cuboid shape, and inside is dead slot (022), and the annular medium (002) of making an uproar of convoluteing is placed to dead slot (022).
2. An ambient noise removal system as recited in claim 1,
the capture module includes:
the acquisition unit is used for acquiring energy corresponding to each frequency sampling point in the first sound frame;
a detection module comprising:
the first judging unit is used for judging the frame type corresponding to the first voice frame, judging the current first voice frame as a voice frame when the energy of the frequency sampling point is in a first threshold value, and calibrating a first position corresponding to the voice frame; when the energy of the frequency sampling point is in a second threshold value, judging that the current first sound frame is a noise frame, and calibrating a second position corresponding to the noise frame; when the energy of the frequency sampling point is in a third threshold value, judging that the current first voice frame is a sub-voice frame, and calibrating a third position corresponding to the sub-voice frame; and when the energy of the frequency sampling point is in a fourth threshold value, judging that the current first sound frame is a secondary noise frame, and calibrating a fourth position corresponding to the secondary noise frame.
3. The ambient noise removal system of claim 1, wherein the detection module comprises:
the storage unit is used for storing a high-frequency area and a low-frequency area corresponding to the frequency sampling points in the first sound frame, carrying out sampling numbering according to the sequence of the captured voice playing signals, and storing the lengths corresponding to the sampling points and the sampling numbers corresponding to the sampling points, wherein the lengths are storage spaces occupied by the sampling points;
the second judgment unit is used for judging whether the sampling point is in a preset frequency range or not, acquiring the length corresponding to the sampling point and the sampling number corresponding to the sampling point when the frequency corresponding to the sampling point exceeds the preset frequency range, and calculating to obtain an interference phase through the processing module;
comparing and obtaining a maximum value corresponding to the high-frequency area and a minimum value corresponding to the low-frequency area according to the second judgment unit;
and the processing unit is also used for calculating to obtain the amplitude of the interference signal according to the maximum value and the minimum value point.
4. An ambient noise removal system according to any of claims 1-3, wherein the frame type of the first speech frame is any one or combination of speech frames, noise frames, sub-speech frames, and sub-noise frames.
5. The ambient noise removal system of claim 1, further comprising:
at least two acoustic sensors, including at least one first acoustic sensor and at least one second acoustic sensor, for receiving audio signals from outside the acoustic sensors;
the processing module is further configured to process a first audio signal acquired by the first acoustic sensor, and subtract a second audio signal acquired by the second acoustic sensor to obtain a third audio signal;
the third judging unit is used for judging whether the sound waves of the first audio signal and the second audio signal have time delay or not, when the sound waves of the first audio signal and the second audio signal have time delay, the first audio signal and the second audio signal are subjected to signal synchronization comparison, and a common signal obtained after time delay is a third audio signal; the time delay is a time difference formed by distance difference in the sound transmission process in the main control direction and the non-main control direction;
the first audio signal is a sound signal with noise emitted from a main control direction, the second audio signal is a noise signal emitted from a non-main control direction, and the third audio signal is a sound signal obtained by denoising the first audio signal.
6. An ambient noise removal system as defined in claim 5, the acoustic sensor further for detecting a discharge of a device in the circuit, the acoustic sensor comprising: the device comprises an ultrasonic sensor, a sound pressure sensor and a surface acoustic wave sensor, wherein the discharge condition is obtained by a detection device in a detection module;
the detection device comprises: the ultrasonic sensor comprises a copper plate (101) which is semi-wrapped on a detection device, and an ultrasonic sensor (103) which is fixed on the inner side of the copper plate (101) through an adjustable screw (102); the ultrasonic sensor comprises an antenna (1021) and a passive coax (1022); the top end of the screw (102) is fixed on an insulation area of the antenna (1021), and the bottom end of the screw is connected with the copper plate (101); the copper plate (101) is connected with the detection device; the electrifying body (1023) of the antenna (1021) is respectively connected with the adjacent screws (102);
the conducting body of the antenna (1021) is connected with the screw (102) adjacent to the conducting body through a signal line (1026), one end of the signal line (1026) is connected to the tail end of one antenna conducting body (1023), and the other end of the signal line is connected to the adjacent screw (102); the antenna (1021) does not intersect with the inner surface of the detection device; the antenna (1021) is fixedly connected with the copper plate (101) through a screw (102), and the length of the screw (102) is determined according to the position depth of the ultrasonic sensor (103) in the detection device; a passive coaxial device (1022) in the ultrasonic sensor (103) is attached to the lower surface of an antenna (1021), a first through hole (1027) is formed in the upper surface of the antenna (1021), and a signal line (1026) penetrates through the first through hole (1027);
one end of the passive coaxial device (1022) is provided with a protrusion (1028), the length of the protrusion (1028) is slightly higher than the thickness of the antenna (1021), the size of the protrusion (1028) is matched with the first through hole (1027) and is arranged in the first through hole (1027), and the conductive part of the protrusion (1028) exposed on the front face of the antenna (1021) is welded with an antenna conductive body (1023) on the front face of the antenna (1021); a passive coax (1022) attached to the back of the antenna (1021); a conductive strip (1030) connected with the antenna conductive body (1023) is covered on the inner wall of the first through hole (1027), and the conductive strip (1030) is in contact with the conductive part of the bump (1028);
the ultrasonic sensor (103) further comprises a connector, one end of the connector is arranged on a corresponding interface of the passive coaxial device (1022), and the connector is embedded in the copper plate (101);
the passive coaxial device (1022) is fixedly connected with the lower surface of the antenna (1021); an annular groove (1011) is formed in the copper plate (101), and an annular pad is arranged in the annular groove (1011); be equipped with second through-hole (1031) on the insulating region of antenna (1021), the top of screw (102) is through second through-hole (1031) and antenna (1021) fixed connection, the bottom mounting of screw (102) is equipped with on copper (101) in the mounting hole corresponding with second through-hole (1031) position, screw (102) are fixed detection device through the mounting hole, wherein the mounting hole is circular structure, the internal surface roughness Ra of circular structure is less than 1.0, and the ring pad that the connector corresponds arranges the inboard of copper (101).
7. An ambient noise removal system as defined in claim 1, wherein the mechanical noise reduction device is adapted to reduce the noise of the machine itself.
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| CN201811142872.6A CN109616133B (en) | 2018-09-28 | 2018-09-28 | Environmental noise removing system |
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| CN201811142872.6A CN109616133B (en) | 2018-09-28 | 2018-09-28 | Environmental noise removing system |
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| US5485522A (en) * | 1993-09-29 | 1996-01-16 | Ericsson Ge Mobile Communications, Inc. | System for adaptively reducing noise in speech signals |
| CN102938254A (en) * | 2012-10-24 | 2013-02-20 | 中国科学技术大学 | Voice signal enhancement system and method |
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