CN2653828Y - Head carried noise killing earphone - Google Patents
Head carried noise killing earphone Download PDFInfo
- Publication number
- CN2653828Y CN2653828Y CN 200320102380 CN200320102380U CN2653828Y CN 2653828 Y CN2653828 Y CN 2653828Y CN 200320102380 CN200320102380 CN 200320102380 CN 200320102380 U CN200320102380 U CN 200320102380U CN 2653828 Y CN2653828 Y CN 2653828Y
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- earphone
- power supply
- amplifying circuit
- noise
- circuit
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Abstract
The utility model relates to a headphone which weakens the environment noise disturbing and improves the earphone tone. The inside of the ear pad of the earphone is provided with a noise eliminating device comprising a circuit board, a microphone, an amplifying circuit, a phase inverting circuit, a power amplifying circuit, a loudhailer and a power supply; the input end of the amplifying circuit is connected with the output end of the microphone; the input end of the phase inverting circuit is connected with the output end of the amplifying circuit; the input end of the phase power amplifying circuit is connected with the output end of the phase converting circuit; the loudhailer is connected with the output end of the power amplifying circuit. The utility model utilizes electric circuit to eliminating the leaked noise to reach the aim of eliminating noise; the total eliminating volume can reach 18 to 21 decibel.
Description
(1) technical field
The utility model relates to a kind of headphone that is used for stereo communication equipment, especially a kind of ambient noise interference that weakens, the headphone of raising earphone tonequality.
(2) background technology
Headphone is widely used in the dual-use communication broadcast equipment, but often is operated under the adverse circumstances, is subjected to the interference of ambient noise, has a strong impact on result of use.Existing noise cancelling headphone often adopts physical method to do some from the contour structures of earphone and improves, and for example strengthens the chucking power of earphone etc.The CN87216419U patent application discloses a kind of de-noising earphone, and it adds a vacuum de-noising body in common headphones, because sound can not be propagated in a vacuum, therefore, the more present common headphones of ability that improved earphone is eliminated outside noise improves.The CN1050962C patent provides a kind of anti-noise earphone, it can be in earphone man made noise, and offset in earphone with anti-noise and the noise that amplitude equates, phase place is opposite, to improve the definition of speech sound signal, be provided with interior microphone in the earphone, earphone is provided with microphone outward, if inside and outside microphone can receive the noise signal, after the processing through a variation controller, simulate the anti-noise that noise amplitude equates, phase place is opposite, noise and anti-noise are offset in earphone, thereby reach good noise reduction audio fruit.
(3) summary of the invention
The purpose of this utility model is to provide a kind of improved wear-type noise killing earphone.
The utility model is improved on the common headset basis, it is provided with in the ear pad inboard of earphone and cuts the device of making an uproar, cut the device of making an uproar and comprise circuit board, microphone, amplifying circuit, phase inverter, power amplifier, loud speaker and power supply, the output of the input termination microphone of amplifying circuit, the output of the input termination amplifying circuit of phase inverter, the output of the input termination phase inverter of power amplifier, loud speaker connects the output of power amplifier, and circuit board can be located on the earmuff of earphone.Power supply can adopt external power supply, and for example car is worn, machine is worn, ship is worn or power supply such as waist-mounted type, perhaps internal power supply, for example battery etc.
The utility model mainly is to utilize Analogical Electronics to cut down leaking the noise of coming in except moulding, structure and the material of utilizing earphone reduces ambient noise, and total reduction can reach the 18-21 decibel.Its operation principle is that a microphone MIC is housed in the earphone inboard, and the noise that monitoring and sampling are leaked amplifies through the oversampling circuit paraphase, produces one and differs 180 ° sound wave with noise phase, and superposeing at the operatic tunes disappears mutually, cuts the purpose of making an uproar thereby reach.Because the response bandwidth of electro-acoustic element, gain, the distortion factor etc. are limited, the de-noising scope can only be in specific one section zone.The utility model is primarily aimed at the wider low-frequency range design of application, if the change component parameter can move on to other frequency range or a certain single-frequency.
In application facet, according to different environment different requirements is proposed for the structure of earphone, power supply etc., the different power supply series of design, other requirements can be adjusted on its basis.
(4) description of drawings
Fig. 1 is the theory diagram of the utility model embodiment.
Fig. 2 cuts the noise cancellation circuit schematic diagram for the utility model embodiment's.
(5) embodiment
Following examples are that 50～600Hz is an example with the de-noising frequency range, in conjunction with the accompanying drawings the utility model are further described.
As shown in Figure 1, present embodiment adopts Analogical Electronics, the circuit board of cutting the device of making an uproar is arranged on earmuff 1 inboard of earphone, the input of the output termination amplifying circuit 2 of microphone MIC, the output of the input termination amplifying circuit 2 of phase inverter 3, the output of the input termination phase inverter 3 of power amplifier 4, loud speaker SP connects the output of power amplifier 4, and circuit board can be located on the earmuff 1 of earphone.Power supply can adopt external power supply, and for example car is worn, machine is worn, ship is worn or power supply such as waist-mounted type, perhaps internal power supply, for example battery etc.
Fig. 2 provides the schematic diagram that left ear is cut noise cancellation circuit, resistance R 1～R3 and capacitor C 1～C3 provide a stable operating potential for microphone MIC, the detected signal of microphone amplifies through amplifying circuit (being made up of operational amplifier U1 and auxiliary element), resistance R 7～R11, capacitor C 4 are formed RC phase-shift circuit (180 ° of paraphase) with C5 and operational amplifier U2 etc., operational amplifier U3 and auxiliary element are formed power amplifier, and the output of power amplifier is connected to loud speaker SP.
In like manner, can provide auris dextra and cut noise cancellation circuit.
Power supply adopts alkaline battery, and designs in earphone, can reduce external connection, is particularly suitable for using in engine room.
Below provide the reference model and the parameter of each main components and parts among Fig. 2.
Operational amplifier U1, U2:1/2 μ PC4072, U3:1/2 NE5532;
Resistance R 1:6.8K, R2:2.2K, R3, R11:1K, R4, R5:47K, R6:470K, R7:100K, R9:51K, R10, R12:10K, R13, R15:33K, R14:8.2K, R16:24K;
Capacitor C 1, C8:100 μ, C2, C7:10 μ, C3, C4:1 μ, C5:0.1 μ, C6:470 μ, C9:54P, C10:220 μ;
Potentiometer W1:5.1K, W2:10K.
Claims (6)
1, wear-type noise killing earphone, it is characterized in that being provided with and cut the device of making an uproar in the ear pad inboard of earphone, cut the device of making an uproar and comprise circuit board, microphone, amplifying circuit, phase inverter, power amplifier, loud speaker and power supply, the output of the input termination microphone of amplifying circuit, the output of the input termination amplifying circuit of phase inverter, the output of the input termination phase inverter of power amplifier, loud speaker connects the output of power amplifier.
2, wear-type noise killing earphone as claimed in claim 1 is characterized in that circuit board is located on the earmuff of earphone.
3, wear-type noise killing earphone as claimed in claim 1 is characterized in that power supply adopts external power supply.
4, wear-type noise killing earphone as claimed in claim 3 is characterized in that said external power supply is that car is worn, and machine is worn, and ship is worn or the waist-mounted type power supply.
5, wear-type noise killing earphone as claimed in claim 1 is characterized in that power supply adopts internal power supply.
6, wear-type noise killing earphone as claimed in claim 5 is characterized in that power supply adopts battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320102380 CN2653828Y (en) | 2003-10-22 | 2003-10-22 | Head carried noise killing earphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320102380 CN2653828Y (en) | 2003-10-22 | 2003-10-22 | Head carried noise killing earphone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2653828Y true CN2653828Y (en) | 2004-11-03 |
Family
ID=34340070
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200320102380 Expired - Fee Related CN2653828Y (en) | 2003-10-22 | 2003-10-22 | Head carried noise killing earphone |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2653828Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100531450C (en) * | 2005-03-22 | 2009-08-19 | 东莞理工学院 | Feed back type active noise eliminating earpiece |
| CN101163351B (en) * | 2006-10-13 | 2012-08-22 | 欧力天工股份有限公司 | Earphone |
| CN101740023B (en) * | 2008-11-20 | 2013-03-27 | 哈曼国际工业有限公司 | Active noise control system with audio signal compensation |
-
2003
- 2003-10-22 CN CN 200320102380 patent/CN2653828Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100531450C (en) * | 2005-03-22 | 2009-08-19 | 东莞理工学院 | Feed back type active noise eliminating earpiece |
| CN101163351B (en) * | 2006-10-13 | 2012-08-22 | 欧力天工股份有限公司 | Earphone |
| CN101740023B (en) * | 2008-11-20 | 2013-03-27 | 哈曼国际工业有限公司 | Active noise control system with audio signal compensation |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |