CN101217828B - A noise suppression device and method - Google Patents
A noise suppression device and method Download PDFInfo
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- CN101217828B CN101217828B CN2007100002115A CN200710000211A CN101217828B CN 101217828 B CN101217828 B CN 101217828B CN 2007100002115 A CN2007100002115 A CN 2007100002115A CN 200710000211 A CN200710000211 A CN 200710000211A CN 101217828 B CN101217828 B CN 101217828B
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Abstract
The present invention provides a noise suppressing device and a method thereof. The device is mainly composed of a cavity, a plurality of ducts, an electroacoustic sensor, a loudspeaker and a noise suppressing circuit; wherein, the sectional area of the cavity is greater than the sectional area of the ducts; one duct is connected with the cavity so as to provide an external acoustic signal to enter the cavity; another duct is connected with the cavity so as to send the processed acoustic signal an ear canal; the electroacoustic sensor is used for receiving the acoustic wave signal which enters the cavity and converting thereof into an electronic signal and then sending thereof the noise suppressing circuit; the loudspeaker is used for receiving the electronic signal which is generated by the noise suppressing circuit and generating an opposite phase acoustic signal; the noise signal with high frequency can be suppressed by a low pass acoustic wave filter which is formed by the ducts and the cavity; the opposite phase acoustic wave signal has better noise suppressing effect to the noise with low frequency in the cavity; the invention achieves the object of noise resistance with full frequency by the effect synthesis of two noise suppressions.
Description
Technical field
What the present invention relates to is a kind of noise-suppressing device and method, especially the device that refers to a kind of cavity body structure that designs in conjunction with noise reducing circuit system and appropriate size, produce anti-phase sound wave by described noise reducing circuit and suppress low frequency noise, form the low pass acoustic wave filter to suppress high frequency noise by described cavity, so reach full rate anti-noise purpose.
Background technology
Long term exposure causes the ear impaired hearing easily in noise, and excessive noise can make the people do not feel like oneself.Popular because of carry-on audio-visual devices in recent years; make to use the number of earphone listoning music increase, because the user is when being exposed in the environment of noise, regular meeting is because can not hear clearly outside sound; and heighten the volume of earphone, therefore long-time the use down damages eardrum.
With the earphone product, the earphone of tool noise suppression effect can generally be divided into two kinds of earmuff formula and ear types in the at present general earphone, the tradition circumaural earphone has the huge earmuff of a volume usually, described earmuff adopts foam as acoustic material mostly, the user is located at the ear outside with earmuff, ear can be coated in the described earmuff, so blocks external noise and enters, right in bulky, be unfavorable for carrying; As for PlayGear Stealth, it is earphone can be filled in the ear, by the tight fit that forms between earphone and the ear, both earphone can be fixed in the ear, and can block ambient noise, though described class PlayGear Stealth has the advantage that is easy to carry about with one, it is following that right and circumaural earphone is compared, though the soundproof effect of PlayGear Stealth is better, because of airtight fully, can cause the air pressure imbalance, and hear noise in the so-called body, also, when the user uses, can hear and speak, swallow, even body muscle, cause the sound that is sent in all bodies during joint motion, and the discomfort that smothers is arranged.
Because existing ear cover structure soundproof effect is not good, therefore have in conjunction with the design of circuit design initiatively in order to filter out noise, No. 4455675, U.S.'s patent of invention " Head phoning " for example, described case at first proposes a kind of voice control system, it is to produce sound wave by a voice sensing device, eliminate unwanted sound wave to interfere, described class technology is extensive use of by relevant dealer at present, only, the preferable suitable frequency range that described class suppresses the noise method is to be the low frequency noise below the number kHz frequency range, high frequency noise then because phase place because of can't the people having the same aspiration and interest, causes the anti-noise poor effect, still must be eliminated by earmuff; As for the later stage is to reach in the various countries' patent that suppresses noise and proposed successively, as No. 4985925, U.S.'s patent of invention " Active noise reduction system ", the electronic building brick that it is arranged in pairs or groups or its circuit arrangement mode or difference is arranged, therefore the right escape of all failing can't eliminate high frequency noise with the design of the active inhibition noise of circuit.
See also No. 6683965, the U.S. shown in Figure 1 patent of invention " In-the-ear noise reduction head phones ", described case proposes a kind of earphone that inserts duct-type, described earphone has a shell body 14, described shell body 14 includes extension 16 can put into the duct (not shown), described shell body 14 has an internal cavity 28, described internal cavity 28 communicates with passage 29 in the described extension 16, its loudspeaker 32 are to be configured in the described channel 29,34 of microphones are configured in the space of described loudspeaker 32 and passage 29 belows, by of the configuration of described loudspeaker 32 with microphone 34, and the coupling or the transmission that produce sound field between described channel 29 and the duct, reach the purpose that reduces noise, only, described cavity 28 there is no filter effect with passage 29, can't the filtering high frequency noise.
See also the novel patent application case in Taiwan shown in Figure 2 number No. 91213715 " reaction type is the noise control earphone initiatively ", it mainly is to be provided with loudspeaker 110 in earmuff 140, receive the noise eliminating signal and produce anti-phase anti-sound signal by described loudspeaker 110, again by the environmental noise of the described loudspeaker 110 of microphone sensor 120 sensings, and be converted to a noise sensing signal, because described microphone sensor 120 is arranged on described loudspeaker 110 the place aheads, and be positioned at the energy eddy current 150 that described loudspeaker 110 the place aheads produce at described earmuff 140 because of near-field effect, therefore can suppress low frequency noise and receive, and can cancel out each other with the anti-phase sound wave that loudspeaker 110 produce; Only, described case is still at the low frequency noise elimination, and its microphone sensor 120 is provided with limited location in described loudspeaker 110 the place aheads, and simultaneously must collocation earmuff 140 and active noise control circuit 130.
Summary of the invention
Because the defective of prior art, main purpose of the present invention is to propose a kind of noise-suppressing device, cavity body structure in conjunction with noise reducing circuit and appropriate size design, suppress low frequency noise by described noise reducing circuit, form low pass sound field filter to suppress high frequency noise by described cavity, so reach full rate anti-noise purpose.
Secondary objective of the present invention is to propose a kind of noise-suppressing device, in the time of can improving traditional PlayGear Stealth with air-tight manner inhibition ambient noise, because ear is pressed the uneven discomfort that is caused.
For achieving the above object, the present invention proposes a kind of noise-suppressing device, and it comprises:
One cavity;
A plurality of conduits are to pass in and out described cavity in order to link described cavity, to provide the sound signal that comprises the noise signal, with the member that forms acoustic wave filter; One noise reducing circuit is the sound signal that includes the noise signal in order to reception, and can produces electric signal;
One electroacoustic transducer is in order to receiving the sound signal in the described cavity, and delivers to described noise reducing circuit after transferring it to electric signal; And
One loud speaker is in order to receiving the electric signal that described noise reducing circuit produces and to produce the sound signal of an anti-phase sound signal superposition in described cavity, and produces the interference negative function with noise signal in the described cavity in described cavity;
The sectional area of described cavity is the sectional area greater than described conduit.
Preferably, the length of described cavity can be not equal to the length of described conduit.
Preferably, described a plurality of conduit is to comprise:
One outer catheter provides the pipeline that described sound signal enters described cavity;
One inner catheter is in order to will send the pipeline of described cavity through the sound signal that high frequency noise is offset.
Preferably, the sectional area of described outer catheter and length can be different with the sectional area and the length of described inner catheter.
Preferably, described electroacoustic transducer is to connect a feedback circuit, and is by described feedback circuit that sound signal is anti-phase to described loud speaker.
Preferably, it also comprises a housing, is in order to ccontaining described cavity, conduit, electroacoustic transducer and loud speaker.
Preferably, described cavity, conduit are one-body molded with described housing.
Preferably, the end that described housing is sent sound wave at described conduit is provided with an earplug structure, in order to filling in human antrum auris, and avoids noise to leak into duct from here.
Preferably, described housing has a circuit and connects the hole, is in order to described electroacoustic transducer wired connection external circuit to be provided.
Preferably, described housing has a circuit and connects the hole, is in order to described loud speaker wired connection external circuit to be provided.
Preferably, the mode that described electroacoustic transducer and loud speaker can be wired or wireless is connected with external circuit.
Preferably, wherein said electroacoustic transducer is arranged between loud speaker and the external auditory meatus.
Preferably, be provided with a perforate between described electroacoustic transducer and the described cavity, in order to provide described electroacoustic transducer to receive sound signal in the described cavity by described perforate, described electroacoustic transducer is vertical to the direction of transfer of cavity with conduit input sound wave by the direction of described perforate reception sound signal.
Preferably, described inside cavity and described conduit junction are provided with chamfering.
Preferably, described cavity madial wall is provided with sound-absorbing material.
Preferably, the relative inner wall of described cavity is not parallel each other.
Preferably, described cavity can be rule or irregularly shaped arbitrarily.
Preferably, described conduit can be rule or irregularly shaped arbitrarily.
For achieving the above object, the present invention more proposes a kind of noise suppression method, and it comprises:
Provide an outer catheter to make sound signal enter a cavity, the sectional area of described cavity is the sectional area greater than inside and outside conduit, and when described sound signal entered described cavity, the high-frequency signals of described sound signal was suppressed;
Receive noise signal in the described cavity by an electroacoustic transducer, and transfer it to electric signal;
Receive the electric signal that described electroacoustic transducer produces by a noise reducing circuit, produce an anti-phase sound signal via loud speaker; Anti-phase sound signal that described loud speaker produces and the noise signal in the described cavity produce in described cavity interferes negative function;
To send described cavity through the sound signal of noise cancellation by an inner catheter.
Preferably, described noise reducing circuit is to comprise a feedback circuit, by described feedback circuit electric signal is delivered to described loud speaker, makes it produce anti-phase sound signal
By the acoustic filter structure that conduit and cavity form, can suppress can't be by the high frequency noise of noise control payment, can reach the noise elimination function of full rate by both combination.
Description of drawings
Fig. 1 is the structural representation of existing No. 6683965 United States Patent (USP);
Fig. 2 is the structural representation of existing application case number No. 91213715 Taiwan patent;
Fig. 3 is a structural representation of the present invention;
Fig. 4 is the schematic diagram of the invention process at the human body ear;
Fig. 5 is an active noise reducing circuit Organization Chart of the present invention;
Fig. 6 is that the present invention simulates when outer catheter, cavity and inner catheter uiform section are long-pending to be designed, and noise is through the unbated spectrogram of cavity energy;
Fig. 7 is that the present invention simulates when outer catheter, cavity and inner catheter unequal section are long-pending to be designed, and noise is through the spectrogram of cavity energy decay;
Fig. 8 is the characteristic quantity mapping that the present invention suppresses high frequency noise.
Description of reference numerals: 10-noise-suppressing device;
The 1-outer catheter; The 11-input; The 12-output; The 2-cavity; The 3-inner catheter; The 31-input; The 32-output; The 4-loud speaker; The 41-opening; The 42-circuit connects the hole; 43-amplifier (Power Amp); The 5-electroacoustic transducer; The 51-opening; The 52-circuit connects the hole; The 53-pre-amplifier; The 6-housing; 61-earplug structure; 7-people's ear; The 71-external auditory meatus; The 72-auricle; The 73-eardrum; 20-noise suppressed control flow; The 21-loop of gaining; 22-noise signal; 23-sound wave interface; The length of L1-outer catheter; The length of L2-cavity; The length of L3-inner catheter; The sectional area of S1-outer catheter; The sectional area of S2-cavity; The sectional area of S3-inner catheter.
Embodiment
For reaching employed technological means of purpose and effect, and graphic cited embodiment only is an aid illustration, in order to your juror understands with reference to the graphic the present invention of description, and the technological means of this case is not limited to cited graphic.
At first explanation, main framework of the present invention can be divided into two parts, one is the design of acoustics filter structure, one for suppressing circuit design, sees also Fig. 3 and shown in Figure 4, described noise-suppressing device 10 about described acoustics filter structure design, it is to comprise a housing 6, be provided with a cavity 2 in described housing 6, the sectional area of supposing described cavity 2 is S2, and length is L2; Be respectively equipped with an outer catheter 1 and an inner catheter 3 at the two ends of described cavity 2, described outer catheter 1 has an input 11 and an output 12, described input 11 is to run through described housing 6 to be communicated with external environment condition, 12 of described inputs are connections and connect described cavity 2, the sectional area of supposing described outer catheter 1 is S1, and length is L1; Moreover, described inner catheter 3 has an input 31 and an output 32, described input 31 is connections and connects described cavity 2,32 of described outputs run through described housing 6, can be communicated with people's ear external auditory meatus 71, the sectional area of supposing described inner catheter 3 is S3, and length is L3; Run through described cavity 2 by described outer catheter 1 with described inner catheter 3, described cavity 2 is communicated with the external environment condition of described housing 6,6 corresponding output 32 places at described inner catheter 3 are provided with an earplug structure 61 at described housing, described earplug structure 61 generally is to adopt soft rubber, plastics or foam, be can be in order to the external auditory meatus 71 of filling in people's ear 7, avoid noise to be leaked in the external auditory meatus 71 by non-device part, described earplug structure 61 outer described housings 6 then can be set up in the auricle 72 of people's ear 7; The size of described earplug structure 61, external form or material are also unrestricted, are to be the best with external auditory meatus 71 driving fits and comfortable person.According to the size of the described housing 6 of actual design or the external form or the material difference of the described earplug structure 61 that adopts, described earplug structure 61 can be done other variation with the collocation kenel of described housing 6; Because described cavity 2 has outer catheter 1, inner catheter 3 links external environment and external auditory meatus 71 respectively, thus its have under static pressure, but the function of external ear pressure in the balance, and the effect of tool high frequency noise inhibition under the dynamic pressure.
Moreover, in described housing 6, be provided with an electroacoustic transducer 5, usually, described electroacoustic transducer 5 can adopt mini microphone, between described cavity 2 and described electroacoustic transducer 5, be provided with opening 51, make described electroacoustic transducer 5 can measure the sound signal of described cavity 2 inside via described opening 51, the size of described opening 51 is to decide according to the kind of the described electroacoustic transducer 5 of actual employing; Be provided with a circuit at described electroacoustic transducer 5 places and connect hole 52 in that described housing 6 is corresponding, it is in order to described electroacoustic transducer 5 wired connection external circuits to be provided that described circuit connects hole 52; Must be noted that the direction A of described electroacoustic transducer 5 by described opening 51 reception sound signals, is vertical to the direction of transfer B of described cavity 2 with described outer catheter 1 input sound signal.
Secondly, in described housing 6, be provided with a loud speaker 4, usually, described loud speaker 4 can adopt loudspeaker, between described cavity 2 and described loud speaker 4, be provided with opening 41, make described loud speaker 4 sound signal is fed through described cavity 2 inside via described opening 41, the size of described opening 41 is to decide according to the kind of the described loud speaker 4 of actual employing; Be provided with a circuit at described loud speaker 4 places and connect hole 42 in that described housing 6 is corresponding, it is in order to described loud speaker 4 wired connection external circuits to be provided that described circuit connects hole 42; Mandatory declaration be that under the situation that design conditions such as structure space and size allow, described electroacoustic transducer 5 also can be connected with external circuit by wireless mode with described loud speaker 4.
The material of described housing 6 is indefinite, normally adopts plastic material, and described outer catheter 1, cavity 2 and described inner catheter 3 then can be one-body molded in described housing 6; Characteristics of the present invention are described outer catheter 1, cavity 2 and described inner catheter 3 be the size of collocation mutually, the sectional area S2 of described cavity 2 must be respectively greater than the sectional area S1 of described outer catheter 1 with described inner catheter 3, S3, described outer catheter 1 can be any regular or irregularly shaped with the section of described inner catheter 3 and described cavity 2, but with circle is good, described outer catheter 1, the length L 1 of cavity 2 and described inner catheter 3, L2, L3 can be different mutually, and described outer catheter 1 can be any regular or crooked irregular kenel with described inner catheter 3; In addition, for avoiding sound signal in described cavity 2, to form reflection, described cavity 2 inner and described outer catheters 1 can be provided with chamfering with described inner catheter 3 junction, or the relative inner wall of described cavity 2 is made as not parallel each other, or sound-absorbing material (as foam) is set in described cavity 2.
The variation of cavity volume and conduit caliber by described outer catheter 1, cavity 2 and described inner catheter 3, make described cavity 2 form the low pass filter that a low-frequency sound wave can pass through, can increase the conduit number according to actual demand, to promote the sound wave filter effect of described cavity 2, herein only with an outer catheter 1, the described cavity 2 of an inner catheter 3 collocation example as an illustration; The noise sound signal that is produced when described housing 6 external environment conditions enters and arrives described cavity 2 via the input 11 of described outer catheter 1, when exporting by described inner catheter 3 again, the high frequency noise signal of described noise sound signal can be because the structure of described cavity 2 formed acoustic wave filters be suppressed (described high frequency noise signal scope definition is the limit about 20KHz of 1KHz to people's ear hearing), the low frequency noise signal of noise sound signal (described low frequency noise signal scope definition is that frequency 1kHz is to the following sound signal of number KHz) then utilizes described electroacoustic transducer 5 to receive the noise signal, transfer described noise signal to electric signal by the feedback circuit (not shown), produce anti-phase sound signal by noise reducing circuit, and be sent to described loud speaker 4, produce an anti-phase sound signal opposite with phase place by described loud speaker 4 again with described noise signal amplitude, described anti-phase sound signal is sent to described cavity 2, the sound signal of described anti-phase sound signal superposition in described cavity 2, and can in described cavity 2, produce the interference negative function with the noise signal in the described cavity 2, so eliminate the low frequency noise signal that described cavity 2 can't suppress, in other words, by combining of described passive type acoustic wave filter and described noise reducing circuit, can suppress high frequency noise signal and low frequency noise signal, reach the noise suppression effect of full rate.When being applied in earphone,,, can't influence the sound signal of desire reception so anti-phase noise suppression sound signal only can cause interference to the noise suppression signal because anti-phase noise suppression sound signal is a superposition on the sound signal that desire receives; And the sound signal that sends by described loud speaker 4, because by by described outer catheter 1, cavity 2 and inner catheter 3 formed acoustic wave filter paths can't be suppressed so its high frequency sound wave signal shows.
Described electroacoustic transducer 5 is in order to receive the noise signal, whether and to be used in that the control sound wave interferes be the convergence phenomenon, prevent anti-noise system generation resonance and be transformed into noise generator, therefore, described electroacoustic transducer 5 is arranged on the place ahead of described loud speaker 4, also promptly is situated between between loud speaker and human antrum auris 71.So, can guarantee that the noise signal can fully be measured by described electroacoustic transducer 5, and the anti-phase sound signal that described loud speaker 4 is produced can be offset in cavity 2 fully with described noise signal, with the safety of protection eardrum 73, the method claims loop circuit control (closed loop feedback control); Review the loudspeaker and the microphone of parts of traditional noise suppression system, it is with the rear at described loud speaker 4 of described electroacoustic transducer 5, extraneous noise can by circuit signal control loudspeaker 4, produce anti-phase signal then earlier by described electroacoustic transducer 5.Whether the interference sound wave that so can't guarantee to enter ear is that convergence is interfered, and the non-addivitity sound wave if feedback circuit is dealt with improperly at that time, will cause unforeseen injury to human body eardrum 73.
About noise reducing circuit of the present invention, because described noise reducing circuit belongs to prior art, therefore no longer describe its circuit arrangement (Layout) mode in detail, only described noise reducing circuit is in order to suppress the low frequency noise signal of described noise-suppressing device 10, therefore see also shown in Figure 5, the design concept of summary description control circuit of the present invention and noise suppressed control flow 20, it can divide into following several groups of parameters:
Loud speaker 4 and amplifier (Power Amplifier) 43, setting this parameter is tool sound wave enlarging function A;
The feedback control parameters C in gain loop 21;
The sound wave interference I of noise signal 22 is meant sound signal and the anti-phase sound signal of described loud speaker 4 generations in the described cavity 2 phenomenon of cancelling each other;
The FEEDBACK CONTROL signal is handled H, is in order to sound signal synthetic and that relatively handle via pre-amplifier (Pre Amp lifier) 5 and gain loop 21, and is adjusted into suitable size;
Suppose that noise signal (Noise) is P (n), the loud speaker output signal be P (v) because sound wave transmitting signals speed is slow more than electric signal, therefore with the noise signal with time-sequencing (P (n), P (n+1), P (n+2) ...), its logic control is as follows:
P(v)＝-ABC□P(n)
P(i)＝P(v)+P(n+1)＝P(n+1)-ABC□P(n)
P(v+l)＝AC(-ABC□P(n))-B□P(i))
＝AC(-BC□P(n)+AB2C□P(n)-B□P(n+1))
When AB=1,
P (v+1)=-ABC P (n+1) ... ... (formula one)
Can learn by formula one, noise feedback control circuit of the present invention has convergence, can be and cause wild effect because of sound wave signal and electric signal time difference, this logic control part mainly is to solve described electroacoustic transducer 5 and the problem of described loud speaker 4 relative positions apart from the formed time difference, because described noise signal 22 is made up of sound waves of different frequencies, with the unifrequency acoustic wave analysis, suppose that the sound wave signal is P1, anti-phase sound wave signal is P2, the time difference that two sound wave signals are caused is dt=dL/v, dL is that described electroacoustic transducer 5 is poor with described loud speaker 4 relative distances, v is an acoustic velocity, and the signal that the sound wave interference is produced is dP, and its relativeness is as follows:
P1＝Sin(w□t+dt)
P2＝Sin(w□t+π)
dt＝dL/v
DP=P1+P2......... (formula two)
By formula two as can be known, described electroacoustic transducer 5 has influenced the amplitude of vibration size after the interference with the time difference that described loud speaker 4 relative distance differences are caused, frequency w is then to interfering not influence, change speech, antinoise logic system of the present invention is not subjected to the frequency difference and influences, and can ignore described frequency parameter.
Via as can be known above-mentioned, the acoustics filter structure design that the present invention constitutes by described outer catheter 1, cavity 2, inner catheter 3, electroacoustic transducer 5 and described loud speaker 4, can eliminate the high frequency noise signal that general traditional noise reducing circuit can't be eliminated, as for the low frequency noise signal, then can adopt the inhibition circuit design to eliminate; Please consult shown in Figure 3ly again, verify through actual design:
The sectional area S1 of described outer catheter 1 is less than 100mm2, and length L 1 is less than 30mm;
The sectional area S2 of described cavity 2 is less than 500mm2, and length L 2 is less than 20mm;
The sectional area S1 of described inner catheter 3 is less than 100mm2, and length L 1 is less than 30mm;
When sectional area S1=S2=S3, the frequency spectrum that sound signal is produced by cavity 2 shows that the sound wave penetrating capacity do not decay as shown in Figure 6; As sectional area S1=S3=3.142mm2, during S2=314.2mm2, then the frequency spectrum that produced by cavity 2 of sound signal as shown in Figure 7, the sound penetrating capacity that shows high-frequency region can decay, in other words, the sectional area S2 of described cavity 2 must be greater than sectional area S1, the S3 of described outer catheter 1 with described inner catheter 3.
Fig. 8 the present invention suppresses shown in the characteristic quantity mapping of high frequency noise (please consulting Fig. 3 simultaneously) for another example, wherein, described curve A is the environmental noise sound signal that is measured by described electroacoustic transducer 5 (being presented at Fig. 3), and the sound signal that described curve B representative is measured in noise-suppressing device 10 provided by the present invention shows that high frequency noise signal (the frequency height is at 2KHz) really can be by the interference counteracting.
In sum, can conclude noise suppression method of the present invention, it comprises the following step:
Provide an outer catheter to make sound signal enter a cavity;
Receive noise signal in the described cavity by an electroacoustic transducer, and transfer it to electric signal;
Receive the electric signal that described electroacoustic transducer produces by a noise reducing circuit, produce an anti-phase sound signal via loud speaker; Anti-phase sound signal that described loud speaker produces and the noise signal in the described cavity produce in described cavity interferes negative function;
To send described cavity through the sound signal of noise cancellation by an inner catheter.
Noise-suppressing device provided by the invention and method, it is in conjunction with the cavity body structure of active noise reducing circuit and appropriate size design, suppress low frequency noise by described active noise reducing circuit, form low pass sound field filter to block high frequency noise by described cavity, so can reach the purpose of full rate anti-noise.
The above only is preferred embodiment of the present invention, only is illustrative for the purpose of the present invention, and nonrestrictive.Those skilled in the art is understood, and can carry out many changes to it in the spirit and scope that claim of the present invention limited, revise, even equivalence, but all will fall within the scope of protection of the present invention.
Claims (33)
1. noise-suppressing device, it is characterized in that: it comprises:
One cavity;
A plurality of conduits link described cavity, pass in and out described cavity in order to sound signal to be provided;
One noise reducing circuit includes the sound signal of noise signal in order to reception, and produces electric signal;
One electroacoustic transducer in order to receiving the sound signal in the described cavity, and is delivered to described noise reducing circuit after transferring it to electric signal; And
One loud speaker, in order to receive the electric signal that described noise reducing circuit produces and to produce an anti-phase sound signal, the sound signal of described anti-phase sound signal superposition in described cavity, and in described cavity, produce and interfere negative function with noise signal in the described cavity;
The sectional area of described cavity is the sectional area greater than described conduit.
2. noise-suppressing device as claimed in claim 1 is characterized in that: being uneven in length in the length of described conduit of described cavity.
3. noise-suppressing device as claimed in claim 1 is characterized in that: a plurality of conduits comprise:
One outer catheter provides described sound signal to enter the pipeline of described cavity;
One inner catheter will be in order to will send the pipeline of described cavity through the sound signal of noise cancellation.
4. noise-suppressing device as claimed in claim 3 is characterized in that: the sectional area of described outer catheter is different with the sectional area and the length of described inner catheter with length.
5. noise-suppressing device as claimed in claim 1 is characterized in that: described electroacoustic transducer connects a feedback circuit, delivers to described loud speaker by described feedback circuit with sound signal is anti-phase.
6. noise-suppressing device as claimed in claim 1 is characterized in that: also comprise a housing, in order to ccontaining described cavity, conduit, electroacoustic transducer and loud speaker.
7. noise-suppressing device as claimed in claim 6 is characterized in that: described cavity, conduit are one-body molded with described housing.
8. noise-suppressing device as claimed in claim 6 is characterized in that: described housing is sent sound wave into an end of duct at conduit, and its outer earplug structure that is provided with partly leaks into human antrum auris in order to avoid noise by non-device.
9. noise-suppressing device as claimed in claim 6 is characterized in that: described housing has a circuit and connects the hole, in order to described electroacoustic transducer wired connection external circuit to be provided.
10. noise-suppressing device as claimed in claim 6 is characterized in that: described housing has a circuit and connects the hole, in order to described loud speaker wired connection external circuit to be provided.
11. noise-suppressing device as claimed in claim 1 is characterized in that: described electroacoustic transducer and loud speaker are that wired or wireless mode is connected with external circuit.
12. noise-suppressing device as claimed in claim 1 is characterized in that: described electroacoustic transducer is arranged between loud speaker and the external auditory meatus.
13. noise-suppressing device as claimed in claim 1, it is characterized in that: be provided with a perforate between described electroacoustic transducer and the described cavity, in order to provide described electroacoustic transducer to receive sound signal in the described cavity by described perforate, described electroacoustic transducer is vertical to the direction of transfer of cavity with conduit input sound wave by the direction of described perforate reception sound signal.
14. noise-suppressing device as claimed in claim 1 is characterized in that: described inside cavity and described conduit junction are provided with chamfering.
15. noise-suppressing device as claimed in claim 1 is characterized in that: described cavity madial wall is provided with sound-absorbing material.
16. noise-suppressing device as claimed in claim 1 is characterized in that: the relative inner wall of described cavity is not parallel each other.
17. noise-suppressing device as claimed in claim 1 is characterized in that: described cavity is rule or irregularly shaped arbitrarily.
18. noise-suppressing device as claimed in claim 1 is characterized in that: described conduit is rule or irregularly shaped arbitrarily.
19. a noise suppression method is characterized in that: its step that comprises is:
Provide an outer catheter to make sound signal enter a cavity, the sectional area of described cavity is the sectional area greater than inside and outside conduit, and when described sound signal entered described cavity, the high-frequency signals of described sound signal was suppressed;
Receive noise signal in the described cavity by an electroacoustic transducer, and transfer it to electric signal;
Receive the electric signal that described electroacoustic transducer produces by a noise reducing circuit, produce an anti-phase sound signal via loud speaker; Anti-phase sound signal that described loud speaker produces and the noise signal in the described cavity produce in described cavity interferes negative function;
To send described cavity through the sound signal of noise cancellation by an inner catheter.
20. noise suppression method as claimed in claim 19 is characterized in that: the sectional area of described outer catheter is different with the sectional area and the length of described inner catheter with length.
21. noise suppression method as claimed in claim 19 is characterized in that: described noise reducing circuit is to comprise a feedback circuit, by described feedback circuit electric signal is delivered to described loud speaker, makes it produce anti-phase sound signal.
22. a noise-suppressing device, it is characterized in that: it comprises:
One cavity, the sectional area of described cavity is greater than the sectional area of described conduit;
A plurality of conduits link described cavity, pass in and out described cavity in order to the sound signal that includes the noise signal to be provided;
Low pass acoustic wave filter by described conduit and cavity form suppresses the high frequency noise signal in the described sound signal.
23. noise-suppressing device as claimed in claim 22 is characterized in that: being uneven in length of described cavity in the length of described conduit.
24. noise-suppressing device as claimed in claim 22 is characterized in that: a plurality of conduits comprise:
One outer catheter provides described sound signal to enter the pipeline of described cavity;
One inner catheter will be in order to will send the pipeline of described cavity through the sound signal of noise cancellation.
25. noise-suppressing device as claimed in claim 24 is characterized in that: the sectional area of described outer catheter is different with the sectional area and the length of described inner catheter with length.
26. noise-suppressing device as claimed in claim 22 is characterized in that: also comprise a housing, in order to ccontaining described cavity and conduit.
27. noise-suppressing device as claimed in claim 26 is characterized in that: described cavity, conduit are one-body molded with described housing.
28. noise-suppressing device as claimed in claim 26 is characterized in that: described housing is sent sound wave into an end of duct at conduit, and its outer earplug structure that is provided with partly leaks into human antrum auris in order to avoid noise by non-device.
29. noise-suppressing device as claimed in claim 22 is characterized in that: described inside cavity and described conduit junction are provided with chamfering.
30. noise-suppressing device as claimed in claim 22 is characterized in that: described cavity madial wall is provided with sound-absorbing material.
31. noise-suppressing device as claimed in claim 22 is characterized in that: the relative inner wall of described cavity is not parallel each other.
32. noise-suppressing device as claimed in claim 22 is characterized in that: described cavity is rule or irregularly shaped arbitrarily.
33. noise-suppressing device as claimed in claim 22 is characterized in that: described conduit is rule or irregularly shaped arbitrarily.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2007100002115A CN101217828B (en) | 2007-01-04 | 2007-01-04 | A noise suppression device and method |
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| CN2007100002115A CN101217828B (en) | 2007-01-04 | 2007-01-04 | A noise suppression device and method |
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| CN101217828A CN101217828A (en) | 2008-07-09 |
| CN101217828B true CN101217828B (en) | 2011-10-12 |
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| CN2007100002115A Expired - Fee Related CN101217828B (en) | 2007-01-04 | 2007-01-04 | A noise suppression device and method |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101848256A (en) * | 2010-04-23 | 2010-09-29 | 周树俊 | Cell phone internally provided with earplug type speaker |
| CN103310796B (en) * | 2013-06-28 | 2016-06-08 | 姜鸿彦 | Voice signal extraction method |
| JP6574529B2 (en) | 2016-02-04 | 2019-09-11 | ゾン シンシァォＺＥＮＧ Ｘｉｎｘｉａｏ | Voice communication system and method |
| TWI597987B (en) * | 2016-02-19 | 2017-09-01 | 中強光電股份有限公司 | Method and system for reducing fan noise and electric device using same |
| CN105910772B (en) * | 2016-05-18 | 2018-09-28 | 广东溢达纺织有限公司 | Ultrasonic leak detection device and ultrasonic leak detection method |
| CN106388700B (en) * | 2016-06-06 | 2020-07-28 | 北京小米移动软件有限公司 | Active noise reduction device for automatic cleaning equipment and automatic cleaning equipment |
| US10170095B2 (en) | 2017-04-20 | 2019-01-01 | Bose Corporation | Pressure adaptive active noise cancelling headphone system and method |
| WO2019053993A1 (en) * | 2017-09-13 | 2019-03-21 | ソニー株式会社 | Acoustic processing device and acoustic processing method |
| TWI702855B (en) * | 2018-11-20 | 2020-08-21 | 財團法人金屬工業研究發展中心 | Active noise reduction device with sound filter and earphone |
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| US6735316B1 (en) * | 2000-07-25 | 2004-05-11 | Michael Jon Wurtz | Cup-in-a-cup structure and assembly method for active-noise-reduction headsets |
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| US5832094A (en) * | 1990-02-01 | 1998-11-03 | Le Her; Francois | Device for transmission of sound with selective filtering for insertion in the outer auditory canal |
| CN1193236A (en) * | 1998-03-10 | 1998-09-16 | 陈皞 | Integrated duct-type telephone transmitter and receiver with vibration acoustical pick-up device |
| US6735316B1 (en) * | 2000-07-25 | 2004-05-11 | Michael Jon Wurtz | Cup-in-a-cup structure and assembly method for active-noise-reduction headsets |
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