CN103856861A - Active noise reduction system, noise reduction earphone and mobile terminal - Google Patents
Active noise reduction system, noise reduction earphone and mobile terminal Download PDFInfo
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Abstract
The invention discloses an active noise reduction system, a noise reduction earphone and a mobile terminal. The active noise reduction system comprises the noise reduction earphone and a noise reduction terminal. The noise reduction earphone comprises earplugs and earphone cables, loudspeakers are arranged in the earplugs, and the noise reduction earphone is connected with the noise reduction terminal through the earphone cables. The noise reduction earphone further comprises a first microphone used for collecting noise signals and transmitting the noise signals to the noise reduction terminal. The loudspeakers are used for outputting de-noising signals which are generated according to the noise signals and sent by the noise reduction terminal, and therefore the effect of eliminating environmental noise is achieved. As the noise reduction earphone is not provided with a noise reduction module, an extra power module is not required, and it is only necessary that the noise reduction terminal supplies power to the noise reduction earphone to drive the microphone. In this way, the power module and the noise reduction module are omitted, wherein the power module and the noise reduction module are large in size and heavy in weight, so that the design of the noise reduction earphone is simplified, and the portability of the noise reduction earphone is improved.
Description
Technical field
The present invention relates to communication technical field, especially relate to a kind of active noise reduction system, noise cancelling headphone and mobile terminal.
Background technology
Noise cancelling headphone of the prior art comprises active mode denoise earphone and passive type noise cancelling headphone, and wherein active mode denoise earphone utilizes " Active Noise Control " principle to carry out noise reduction, and its noise reduction is better than the noise reduction of passive noise cancelling headphone.Described " Active Noise Control " principle refers to: all sound is all made up of certain frequency spectrum, if can find a kind of sound, its frequency spectrum is just the same with the noise that will eliminate, and just phase place is just contrary, just this noise can be balanced out completely.Therefore, existing active mode denoise earphone, comprises microphone and Dolby circuit, gather the noise signal of external environment condition by microphone, Dolby circuit, according to the noise cancellation signal that noise signal produces and this noise signal equivalent is reverse, is cancelled out each other with noise, thereby realizes the effect of noise reduction.
Because active mode denoise earphone of the prior art is with Dolby circuit, and Dolby circuit needs power supply, and power supply adopts dry cell conventionally.Therefore, cause the complicated structure of active mode denoise earphone, volume and weight is larger, unlike common headphones, is easy to carry.
Summary of the invention
Main purpose of the present invention is to provide a kind of active noise reduction system, noise cancelling headphone and mobile terminal, is intended to simplify the design of noise cancelling headphone, improves the portability of noise cancelling headphone.
To achieve these objectives, the present invention proposes a kind of active noise reduction system, comprise noise cancelling headphone and noise reduction terminal, described noise cancelling headphone comprises earplug and earphone cord, in described earplug, be provided with loudspeaker, described noise cancelling headphone is connected with described noise reduction terminal by described earphone cord, described noise cancelling headphone also comprises one first microphone, described the first microphone is used for gathering noise signal and sends described noise reduction terminal to, the noise cancellation signal generating according to described noise signal that described loudspeaker send for exporting described noise reduction terminal.
Preferably, described noise cancelling headphone also comprises a second microphone and time division multiplexing module, and described second microphone is used for gathering voice signal, and described time division multiplexing module is for sending described voice signal and noise signal timesharing to described noise reduction terminal.
Preferably, described the first microphone gathers the noise signal within the scope of predeterminated frequency under the control of described noise reduction terminal.
Preferably, described the first microphone is located in described earplug.
The present invention's a kind of noise cancelling headphone of simultaneously deducting a percentage, comprise earplug and earphone cord, in described earplug, be provided with loudspeaker, described noise cancelling headphone is connected with noise reduction terminal by described earphone cord, described noise cancelling headphone also comprises one first microphone, described the first microphone is used for gathering noise signal and sends described noise reduction terminal to, the de-noising signal that described loudspeaker send for exporting described noise reduction terminal.
Preferably, described noise cancelling headphone also comprises a second microphone and time division multiplexing module, and described second microphone is used for gathering voice signal, and described time division multiplexing module is for sending described voice signal and noise signal timesharing to described noise reduction terminal.
Preferably, described the first microphone gathers the noise signal within the scope of predeterminated frequency under the control of described noise reduction terminal.
Preferably, described the first microphone is located in described earplug.
The present invention also proposes a kind of mobile terminal, comprise a receiver module, noise reduction module and sending module, the noise signal that described receiver module sends for receiving external equipment, described noise reduction module is for generating noise cancellation signal according to described noise signal, and described sending module is for returning to described noise cancellation signal to described external equipment.
Preferably, described noise reduction module also for: control described external equipment and gather the noise signal within the scope of predeterminated frequency.
A kind of active noise reduction system provided by the present invention, because noise cancelling headphone and terminal equipment support the use conventionally, therefore noise cancelling headphone and terminal equipment are done as a whole, cleverly the noise reduction module of noise cancelling headphone in prior art is transplanted in terminal equipment, and change the syllogic pin of noise cancelling headphone into four-part form pin and be connected with terminal equipment, finally form the active noise reduction system being formed by noise cancelling headphone and noise reduction terminal of the present invention.This active noise reduction system gathers noise signal by the microphone of noise cancelling headphone, and is exported according to returning to noise cancelling headphone after noise signal generation noise cancellation signal by the noise reduction module of noise reduction terminal inner, has realized the effect of eliminating environmental noise.
Because noise cancelling headphone of the present invention does not have noise reduction module, and its four-part form pin comprises a microphone pin, therefore do not need additionally to arrange power module, only need noise reduction terminal to power to drive microphone to it, thereby the power module and the noise reduction module that occupy larger volume and weight are saved, simplify the design of noise cancelling headphone, improved the portability of noise cancelling headphone.
In sum, active noise reduction system of the present invention, by conceiving cleverly and designing, has obtained beyond thought technique effect, makes noise cancelling headphone have the decrease of noise functions of existing noise cancelling headphone and the portability of common headphones concurrently, has promoted greatly user's experience.
Brief description of the drawings
Fig. 1 is the structured flowchart of active noise reduction system one embodiment of the present invention;
Fig. 2 is the structural representation of the active noise reduction system in Fig. 1;
Fig. 3 is the structured flowchart of mobile terminal one embodiment of the present invention.
Realization, functional characteristics and the advantage of the object of the invention, in connection with embodiment, are described further with reference to accompanying drawing.
Embodiment
Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Referring to Fig. 1-Fig. 3, active noise reduction system one embodiment of the present invention is proposed, described active noise reduction system comprises noise cancelling headphone 100 and noise reduction terminal 200.
Wherein, noise cancelling headphone 100 is four-part form earphone, comprise earplug 110, earphone cord 120, loudspeaker (scheming not shown) and the first microphone 130, loudspeaker are located in earplug 110, the first microphone 130 can be located on earphone cord 120, but be preferably located in earplug 110, earphone cord 120 one end are connected with earplug 110, and the other end is connected with noise reduction terminal 200 by a four-part form pin 121.This four-part form pin 121 comprises tetra-sections of L, R, G, M, after being connected with the four-part form audio interface 201 of noise reduction terminal 200, noise reduction terminal 200 drives respectively left and right loudspeaker and the microphone of noise cancelling headphone 100 by L channel L pin, R channel R pin and microphone M pin, therefore noise cancelling headphone 100 itself does not need to configure power supply.Wherein G represents GND grounding pin.
The first microphone 130 is for gathering the noise signal of surrounding environment, and sends noise signal to noise reduction terminal 200; Loudspeaker are for exporting the audio signal that noise reduction terminal 200 sends, comprising music signal, voice signal and noise cancellation signal, noise cancellation signal is and just contrary acoustic signals of the phase place of noise signal, can cancels out each other with noise signal, thereby reach the object abating the noise.Be located at earplug 110 when interior when the first microphone 130, just can collect the identical noise signal of hearing with people's ear, finally obtain better noise reduction.
Further, the first microphone 130 can also gather the noise signal within the scope of predeterminated frequency under the control of noise reduction terminal 200, to realize, the environmental noise of different frequency range is optionally eliminated and is shielded.
Further, noise cancelling headphone 100 also comprises a second microphone 140 and time division multiplexing module 150, and the two is located on earphone cord 120.Second microphone 140 is for gathering or record user's voice signal; Time division multiplexing module 150 comprises a time multiplexing circuit, utilize time-division multiplex technology, the signal that the first microphone 130 and second microphone 140 are obtained was interweaved within the different time periods, and the M pin timesharing that is four-part form pin 121 by same channel is imported in noise reduction terminal 200 and processed.Thereby, make noise cancelling headphone 100 can also be applied to the communicating terminals such as mobile phone, in user's communication process, initiatively carry out noise reduction, thereby even in very noisy environment, also can clearly hear the other side's voice, not affected by ambient noise.
The present embodiment has been described in detail with ear noise-reducing headphone, and noise cancelling headphone in fact of the present invention can be also head-mounted noise reduction earphone, and the earmuff of head-mounted noise reduction earphone is just equal to the earplug 110 of ear noise-reducing headphone.
Receiver module 210: the various signals that send for receiving operational order and external equipment, described signal comprises the noise signal that noise cancelling headphone 100 sends.If communicating terminals such as mobile terminal are mobile phone, receiver module 210 also receives the communication signal that base station sends; In the time that noise cancelling headphone 100 has two microphones, receiver module 210 receives after the signal that microphone M pin sends into, and is isolated out noise signal and voice signal according to time slot, sends respectively noise reduction module 220 and speech processing module 240 to.
Noise reduction module 220: for according to noise signal, computing generates an equivalent and reverse noise cancellation signal in signa.Noise reduction module 220 comprises a Dolby circuit, and this Dolby circuit is processed noise signal by active noise reduction algorithm, generates a noise cancellation signal.Phase inversion by noise signal is come, just contrary with the phase place of original signal, differs 180 °, and sends sending module 230 to.230 loudspeaker that noise cancellation signal is returned to noise cancelling headphone 100 by L channel L and R channel R pin of sending module are exported, thereby reach the effect of offsetting or suppressing external environment condition noise.
Further, the frequency range that noise reduction module 220 can also gather noise signal to the first microphone 130 of noise cancelling headphone 100 is controlled, control 130 noise signals that gather within the scope of predeterminated frequency of the first microphone, to realize, the environmental noise of different frequency range is optionally eliminated or shielded.For example, control the first microphone 130 and will not gather particular low frequency rate noise, listen to surrounding enviroment sound so that clear, as alarm signal, loudspeaker buzzing, friend's talk, airport or station broadcast etc., particularly retain alarm signal, can improve user and use the fail safe of noise cancelling headphone; Or for user provides several scenes pattern, as public transport/train, aircraft, office, different scene modes has instruction targetedly on noise reduction stresses.
Speech processing module 240: for the treatment of voice signal, and exported via the loudspeaker that L channel L and R channel R pin return to noise cancelling headphone 100, described voice signal comprises the audio signal such as music, recording.If communicating terminals such as mobile terminal are mobile phone, speech processing module 240 is also processed the voice signal that the second microphone 140 of noise cancelling headphone 100 gathers, and this voice signal is carried out after speech coding, mails to base station by sending module 230 via air interface; The voice signal simultaneously base station being sent carries out after speech coding, sends to the loudspeaker of noise cancelling headphone 100 to be exported, thereby realize voice call by sending module 230.When user utilizes noise cancelling headphone 100 and the other side to converse, even in very noisy environment, also can clearly hear the other side's voice, not affected by ambient noise.
Accordingly, active noise reduction system of the present invention, because noise cancelling headphone and terminal equipment support the use conventionally, therefore noise cancelling headphone and terminal equipment are done as a whole, cleverly the noise reduction module of noise cancelling headphone in prior art is transplanted in terminal equipment, and change the syllogic pin of noise cancelling headphone into four-part form pin and be connected with terminal equipment, finally form the active noise reduction system being formed by noise cancelling headphone and noise reduction terminal of the present invention.This active noise reduction system gathers noise signal by the microphone of noise cancelling headphone, and is exported according to returning to noise cancelling headphone after noise signal generation noise cancellation signal by the noise reduction module of noise reduction terminal inner, has realized the effect of eliminating environmental noise.
Because noise cancelling headphone of the present invention does not have noise reduction module, and its four-part form pin comprises a microphone pin, therefore do not need additionally to arrange power module, only need noise reduction terminal to power to drive microphone to it, thereby the power module and the noise reduction module that occupy larger volume and weight are saved, simplify the design of noise cancelling headphone, improved the portability of noise cancelling headphone.
In sum, active noise reduction system of the present invention, by conceiving cleverly and designing, has obtained beyond thought technique effect, makes noise cancelling headphone have the decrease of noise functions of existing noise cancelling headphone and the portability of common headphones concurrently, has promoted greatly user's experience.
Should be understood that; these are only the preferred embodiments of the present invention; can not therefore limit the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes specification of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (10)
1. an active noise reduction system, comprise noise cancelling headphone and noise reduction terminal, described noise cancelling headphone comprises earplug and earphone cord, in described earplug, be provided with loudspeaker, described noise cancelling headphone is connected with described noise reduction terminal by described earphone cord, it is characterized in that, described noise cancelling headphone also comprises one first microphone, described the first microphone is used for gathering noise signal and sends described noise reduction terminal to, the noise cancellation signal generating according to described noise signal that described loudspeaker send for exporting described noise reduction terminal.
2. active noise reduction system according to claim 1, it is characterized in that, described noise cancelling headphone also comprises a second microphone and time division multiplexing module, described second microphone is used for gathering voice signal, and described time division multiplexing module is for sending described voice signal and noise signal timesharing to described noise reduction terminal.
3. active noise reduction system according to claim 1, is characterized in that, described the first microphone gathers the noise signal within the scope of predeterminated frequency under the control of described noise reduction terminal.
4. according to the active noise reduction system described in claim 1-3 any one, it is characterized in that, described the first microphone is located in described earplug.
5. a noise cancelling headphone, comprise earplug and earphone cord, in described earplug, be provided with loudspeaker, described noise cancelling headphone is connected with noise reduction terminal by described earphone cord, it is characterized in that, described noise cancelling headphone also comprises one first microphone, and described the first microphone is used for gathering noise signal and sends described noise reduction terminal to, the de-noising signal that described loudspeaker send for exporting described noise reduction terminal.
6. noise cancelling headphone according to claim 5, it is characterized in that, described noise cancelling headphone also comprises a second microphone and time division multiplexing module, described second microphone is used for gathering voice signal, and described time division multiplexing module is for sending described voice signal and noise signal timesharing to described noise reduction terminal.
7. noise cancelling headphone according to claim 5, is characterized in that, described the first microphone gathers the noise signal within the scope of predeterminated frequency under the control of described noise reduction terminal.
8. according to the noise cancelling headphone described in claim 5-7 any one, it is characterized in that, described the first microphone is located in described earplug.
9. a mobile terminal, it is characterized in that, comprise a receiver module, noise reduction module and sending module, the noise signal that described receiver module sends for receiving external equipment, described noise reduction module is for generating noise cancellation signal according to described noise signal, and described sending module is for returning to described noise cancellation signal to described external equipment.
10. mobile terminal according to claim 9, is characterized in that, described noise reduction module also for: control described external equipment and gather the noise signal within the scope of predeterminated frequency.
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