A kind of noise cancelling headphone
The utility model relates to a kind of noise cancelling headphone.
When people used earphone to listen to the music or receive calls, the noise of external environment had a strong impact on the quality of sound.In the today of pursuing high-quality life, environmental noise more and more becomes the worry of hiding in people's life, so, a kind of noise cancelling headphone that is different from common headphones has appearred on the market.Existing noise cancelling headphone is divided into two kinds: active noise reduction formula and passive noise-reduction type.Active noise reduction formula earphone is exactly to produce the anti-phase sound wave that equates with ambient noise by noise reduction system, with the noise neutralization, thus the effect of realization noise reduction; Passive noise-reduction type earphone mainly forms enclosure space by surrounding ear, perhaps adopts the acoustic material such as silica gel earplugs to stop outside noise.Existing passive noise cancelling headphone can only adopt physically-isolated mode centering high frequency noise to decay, and helpless to low-frequency noise ubiquitous in the life; Existing active noise reduction earphone adopts integrated chip DSP algorithm or full resolution element combined method more, and all there is complex structure in the active noise reduction formula earphone of two kinds of structures, debugging inconvenience and production, the shortcoming that development cost is high.
The utility model content
The technical problems to be solved in the utility model provides a kind of simple in structure, debugging is convenient, with low cost, the ability that abates the noise is strong noise cancelling headphone.
For solving the problems of the technologies described above, noise cancelling headphone of the present utility model comprises auricular concha and is installed in the interior loud speaker of auricular concha, its design feature is that pickup Mike is installed in the described auricular concha, and pickup Mike's audio output is electrically connected to and audio signal can be carried out exporting on the denoising device of described loud speaker after anti-phase again.
Described denoising device comprises be used to the power module that electric power is provided and is connected to noise reduction chip between pickup Mike and the loud speaker.
Described noise reduction chip comprises prime operational amplifier on the signal output part that is connected to pickup Mike, be connected to the filtering phase shift block on the signal output part of prime operational amplifier and be connected to speaker amplifier on the signal output part of filtering phase shift block; The signal output part of speaker amplifier is connected electrically on the signal input part of described loud speaker.
Described noise reduction chip also comprises the upper electric control module that is connected with power module.
Described auricular concha arranges two altogether, is connected with headband between two auricular conchas.
Shape and the big or small annular sound-proof ear cover that adapts with people's ear are installed on the described auricular concha.
The beneficial effects of the utility model are: use pickup Mike to collect the interior noise of auricular concha, utilize denoising device with the anti-phase loud speaker of exporting to of noise signal, original noise and anti-phase after noise neutralization, reach the purpose of noise reduction, whole noise cancelling headphone is simple and practical, and noise reduction capability is strong; Denoising device uses the structure of noise reduction chip external power supply module, and power module can use common batteries to power, the noise reduction chip focus on noise signal and anti-phase after export to loud speaker, debugging is convenient, and is with low cost; The circuit structure of level amplification, phase-shift filtering before and after the noise reduction chip internal adopts, peripheral cell is few, and parameter arranges conveniently; Upper electric control module energy reasonable distribution electric power, effectively isolation is disturbed, and eliminates the noise of loud speaker self generation when powering on; Auricular concha adopts the headset form of two auricular concha intermediate connector bands, and annular sound-proof ear cover is set on the auricular concha, wears comfortable and isolating exterior noise further.The utility model is simple in structure, debugging is convenient, with low cost, noise reduction capability is strong.
Description of drawings
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail:
Fig. 1 is the structural representation of a kind of execution mode of the present utility model;
Fig. 2 is the structural representation of the second execution mode of the present utility model;
Fig. 3 is the structural representation of the third execution mode of the utility model;
Fig. 4 is the schematic diagram that the utility model adopts headset style structure;
Fig. 5 is the schematic diagram that the utility model adopts In-Ear structure.
With reference to accompanying drawing, a kind of execution mode of noise cancelling headphone of the present utility model is to comprise auricular concha 1 and the loud speaker 2 that is installed in the auricular concha 1, pickup Mike 3 also is installed in the auricular concha 1, and pickup Mike 3 audio output is electrically connected to a denoising device that audio signal can be carried out exporting to again after anti-phase described loud speaker 2.Be connected with audio jack 6 on the loud speaker 2, during use, audio jack 6 is plugged on the audio frequency apparatus 7.Pickup Mike 3 is used for collecting the noise near people's ear, the noise signal that denoising device is collected to pickup Mike 3 is carried out anti-phase processing and is exported afterwards inversion signal with former noise signal single spin-echo, noise signal and inversion signal neutralization, namely reached the purpose of noise reduction, people's ear can only be heard music that audio frequency apparatus 7 transmits or voice signal and can't hear noise.
Wherein, denoising device comprise be used to the power module 5 that electric power is provided and be connected to pickup Mike 3 and loud speaker 2 between noise reduction chip 4.Power module 5 can use common batteries, also can use wire to connect other power supply.Noise reduction chip 4 comprises prime operational amplifier 41 on the signal output part that is connected to pickup Mike 3, be connected to the filtering phase shift block 42 on the signal output part of prime operational amplifier 41 and be connected to speaker amplifier 43 on the signal output part of filtering phase shift block 42.The signal output part of speaker amplifier 43 is connected electrically on the signal input part of loud speaker 2.Noise reduction chip 4 also comprises the upper electric control module 44 that is connected with power module 5.Upper electric control module 44 is used for distributing electric power and isolation to disturb, can avoid loud speaker 2 " bang bang " sound of sending when electric.
Denoising device can be located at the outside of auricular concha, also can be located at the inside of auricular concha.Shown in Fig. 1 is the situation that denoising device is located at the auricular concha outside, this kind situation in the specific implementation, denoising device can be installed in the box body, uses common 3A battery to be power supply, and battery case is set on the box body.For headset style noise cancelling headphone, denoising device can also be selected to be installed on the headband.Shown in Fig. 2 is the situation that denoising device is located at auricular concha 1 inside, this kind situation relatively is suitable for headset style noise cancelling headphone, because the auricular concha 1 of headset style noise cancelling headphone is relatively large, can hold battery case and each components and parts relevant with noise reduction chip 4 in it.To sum up, for installation site and the mounting means of denoising device, can carry out flexible configuration according to actual conditions, for example power module 5 can be separated installation with noise reduction chip 4, power module 5 is installed in the auricular concha 1, and noise reduction chip 4 is installed in the situations such as auricular concha 1 is outer and all can be suitable for.
Fig. 3 shows another execution mode of the present utility model, in this embodiment, denoising device is installed in the control box 12, noise reduction switch 8 and power supply indicator 9 have been increased, noise reduction switch 8 is used for the start and stop of control decrease of noise functions, and whether power supply indicator 9 is used for demonstration decrease of noise functions directly perceived in running order.Control box 12 is also passed through in audio frequency importation at audio frequency apparatus 7, on the control box 12 on the audio frequency incoming line corresponding listening key 10 and the volume knob 11 of increasing, volume knob 11 is used for regulating the volume of earphone, listening key 10 can be used for cutting off the input of audio signal, conveniently receives calls or talks with the people.
With reference to Fig. 4 and Fig. 5, preferred, auricular concha 1 arranges two altogether, and is corresponding with people's two ears respectively, and two auricular conchas 1 are interior all to be equipped with loud speaker 2 and pickup Mike 3.Auricular concha 1 front end also is equipped with shape and the big or small annular sound-proof ear cover 14 that adapts with people's ear.As shown in Figure 4, be connected with headband 13 between two auricular conchas 1.Headband 13 adopts the outer structure that coats corium of internal layer stainless steel.In order to wear with easy to carry, headband 13 can adopt telescopic or folding structure.Annular sound-proof ear cover 14 uses flexible material to make, and size is advisable with the size that is slightly larger than people's ear.Above-mentioned execution mode is headset style noise cancelling headphone, the utility model can also use the ear noise-reducing headphone without headband, as shown in Figure 5, this kind ear noise-reducing headphone front end can arrange annular acoustic insulating ear plug 15, its size is advisable just to fill in people Er Nei, and pickup Mike 3 is installed in the rear portion of loud speaker 2, people's ear dorsad, and auricular concha 1 offers the pickup hole 30 corresponding with pickup Mike in its back-end.
In sum, the utility model is not limited to above-mentioned embodiment.Those skilled in the art under the prerequisite that does not break away from spirit and scope of the present utility model, can do some changes and modification.Protection range of the present utility model should be as the criterion with claim of the present utility model.