CN205430549U - Bone conduction headphones - Google Patents

Abstract

The utility model discloses a bone conduction headphones and based on bone conduction headphones's audio playback device, bone conduction headphones includes human bone and organizes model modeling module and digital precorrector, time delay estimation unit, digital analog converter, analog to digital converter, a low pass filter, the 2nd low pass filter, audio amplifier, audio frequency driving amplifier, at least one osteoacusis microphone, at least one bone conduction oscillator, the different users' of real -time detection the human bone and the damping effect information of tissue, based on damping effect information produces a compensation transfer function, through compensation transfer function conducts in skeleton and tissue after carrying out digital precorrection to input audio signal. The problem of different user's tissue thickness different, the bone conduction headphones who leads to experiences differently is solved.

Description

A kind of bone conduction earphone

Technical field

This utility model relates to Intelligent worn device technical field, particularly relates to a kind of audio-frequency processing method and bone conduction earphone.

Background technology

Bone conduction is a kind of sound conduction mode, and generally, most of sound that we hear is that sound wave passes through aerial conduction.The sound wave of aerial conduction by outer middle ear arrive cochlea internal ear and by the perception of auditory nerve institute.In addition, sound wave can also be converted into the mechanical vibration of different frequency, transmits sound wave by the skull of people, temporal bone, bony labyrinth, the transmission of internal ear lymph fluid, cochlea, auditory nerve, auditory center, here it is bone conduction technology.Aerial conduction sound wave refers to be transmitted to internal ear by external ear, middle ear；Bone conduction is then vibration skull or temporal bone, is not transmitted directly in the middle of internal ear by external ear and middle ear.Relative to traditional aerial conduction mode being produced sound wave by Loudspeaker diaphragm, bone conduction eliminates the step of many sound wave transmission, can realize sound-reducing clearly in a noisy environment, and sound wave also will not have influence on other people because of spreading in atmosphere.The electro-acoustic element of bone conduction technology is divided into bone conduction vibrator and bone-conduction microphone.Bone conduction vibrator for called, called i.e. listens to sound.Aerial conduction speaker of the prior art is the signal of telecommunication to be converted into sound wave reach auditory nerve.When using traditional aerial conduction earphone, environment noise would generally hinder user called and send words, because environment noise and voice are mutually obscured during aerial conduction, all can be conducted to auditory nerve.When user carries out complex environment activity, such as, running body-building, drive vehicle, need pleasant due to aerial conduction earphone or when covering whole user's auditory meatus, user is hardly perceivable surrounding sound, such as: near the automobile that crosses, other people call etc..This usually can make troubles to user or potential safety hazard.Additionally, life-time service pleasant aerial conduction earphone can damage the audition of user, serious can causing becomes deaf.

Bone conduction vibrator is then that the vibration signal that the signal of telecommunication converts directly reaches auditory nerve by bone.Both differences are that the Transfer Medium of sound wave (vibration signal) is different.Bone-conduction microphone technology is used for sending words, send words i.e. to collect sound.Conductance send words to be that sound wave reaches mike by air, and bone-conduction microphone words the most directly transmit vibration signal by bone.So, the bone conduction earphone developed from Hearing aid technology is gradually replacing conventional air conduction earphone, by contrast, bone conduction technology has the advantage that (1) makes the ambient sound around the free perception of ear, therefore ears can be opened, improve user's perception environment capacity and the safety of use, (2) bone conduction device is unpleasant to the ear, do not injure tympanum, avoid impaired hearing, and comfort and safety can be extended, (3) there is no electric wave, the electromagnetic wave potential negative effect to brain can be eliminated, (4) bone-conduction microphone collects user speech by vibration, the noise reduction of voice communication can be realized, mask environment noise completely.

But, bone conduction technology also has following several shortcoming: the quality of (1) bond-conduction sound is correlated with the position contacting skeleton, also relevant with the feature of tissue.Such as: the age of user, sex, the difference such as fat or thin all can cause different user when using same bone conduction earphone, have different experience, and often this different experience is all penalty.(2) utilizing bone conduction technology called or send words, bone conduction device must be close to bone, and sound wave directly reaches auditory nerve by bone.Wearing mode determines that the compressing of bone conduction device height must be conducted on skeleton by bone conduction device, and once absent-mindedness will affect the quality of audio frequency transmission.But, the wearing mode of this height compressing skeleton makes user's comfort in use, skin health influenced to different extents.(3) skeleton and tissue produce amplitude fading and the time delay with frequency selectivity to vibration signal.The audio signal in high-fidelity or broadband is difficult to by bone conduction to auditory nerve.So user's most users based on prior art can complain that bone conduction earphone " tonequality " and " timbre " are poor.(4) problem of bone conduction leakage sound.Because the characteristic of solid conduction vibration, the problem that most existing bone conduction technologies all cannot really solve bone conduction leakage sound.This is because prior art, compensated skeleton and the reality of tissue attenuation vibration signal of frequency dependence by big volume, big vibration signal.But this method is equivalent to drink poison to quench thirst, and robs Peter to pay Paul.User can complain that leakage sound is serious, or since it is desired that bigger power, bone conduction vibrator volume weight is greatly increased, and causes equipment entirety the heaviest.(5) bone conduction earphone is worn affects eyeglasses-wearing.Prior art, in order to select preferable bone conduction contact position, does not accounts for the use experience of wearing spectacles user.As such, it is desirable to the user worn glasses generally complains that bone conduction earphone wears difficulty.(6) bone conduction earphone is the system of open ears.But this is a double-edged sword.Prior art majority publicizes its benefit, and ignore its this shortcoming, namely as user to noisy environment, such as downtown area, time in the middle of the environment that subway moderate environment noise is bigger, because the opening of bone conduction earphone can cause user to can't hear the sound transmitted in earphone at all.

Shortcoming based on above-mentioned bone conduction earphone, it can be seen that still suffer from the biggest improvement and development space.

Utility model content

Therefore, this utility model makes its performance significantly be improved for the defect multiple corrective measures of proposition of above-mentioned bone conduction technology.

Concrete, this utility model by the following technical solutions:

This utility model provides a kind of method of Audio Processing, and described method is used for bone conduction earphone, it is provided that an observation feedback channel, detects skeleton and the attenuation effect information of tissue of different user in real time, it is provided that attenuation effect information；Based on described attenuation effect information, produce the characteristic that a compensation transmission function, the described compensation transmission function described skeleton of sign and tissue attenuation effect are contrary；Obtain the audio signal of input, conducted in skeleton and tissue by described compensation after transmission function carries out digital pre-calibration to described audio signal.

Preferably, based on described attenuation effect information, produce to compensate and transmit the attenuation effect information that function specially provides according to described observation feedback channel, human skeleton and tissue construction are transmitted function, then this transmission function is asked the most described compensation of its inverse function transmit function；Described audio signal is conducted specially described audio signal in skeleton and tissue after described compensation transmission function and is transferred function by artificial distortion through described compensation, audio signal through artificial distortion transfers the audio signal of simulation to by digital-to-analogue conversion, by reaching directly to drive the power level of bone conduction vibrator after low-pass filtering and audio driven processing and amplifying, driving signal is converted to vibration signal by described bone conduction vibrator, conduct to auditory nerve by skeleton and tissue form bone conduction signal, thus be perceived by the user.

Preferably, described observation feedback channel detects the bone conduction signal being attenuated by bone-conduction microphone, carries out real-time attenuation effect information updating.

Preferably, the attenuation effect information of skeleton and tissue is frequency decay effect.

Preferably, described digital pre-calibration is based on plural number look-up table LUT method or based on Volterra model；For plural number look-up table LUT, be suitable to the situation that described bone conduction earphone system is the function of digital audio input signal amplitude, ignore the phase information of input audio signal, according to the data in described observation feedback channel continual renewal form thus carry out adaptive digital precorrection；For Volterra model, by Volterra memory polynomial, bone conduction earphone is modeled, and carry out adaptive digital pre-calibration by updating crucial Volterra coefficient continuously, it is directly realized by by multiplier or is indirectly realized by a Coefficient Look-up Table, and described Coefficient Look-up Table comprises the key coefficient of Volterra model.

The technique scheme that this utility model provides solves different human body feature, wears the impact that bone conduction earphone is experienced by degree of tightness.

This utility model additionally provides a kind of bone conduction earphone, described bone conduction earphone includes headset body, skeleton and tissue model modeling module and numeral presetter it is provided with in described headset body, described skeleton and tissue model modeling module detect the skeleton of different user and the attenuation effect information of tissue in real time, there is provided described attenuation effect information parameter to described digital pre-calibration device, described digital pre-calibration device obtains the audio signal of input, based on described attenuation effect information, described audio signal is carried out digital pre-calibration process.

nullPreferably，Described bone conduction earphone also includes Delay computation unit，Digital to analog converter，Analog-digital converter，First low pass filter，Second low pass filter，Audio frequency amplifier，Audio drive amplifiers，At least one bone-conduction microphone，At least one bone conduction vibrator，Wherein，Wherein，Described Delay computation unit、Described digital to analog converter、Described analog-digital converter、Described first low pass filter、Described second low pass filter、Described audio frequency amplifier、Described audio drive amplifiers is arranged in described headset body，At least one bone-conduction microphone described，Described audio frequency amplifier，Described first low pass filter，Described analog-digital converter，Described skeleton and tissue model modeling module，Described digital pre-calibration device，Described digital to analog converter，Described second low pass filter，Described audio drive amplifiers，At least one bone conduction vibrator described is sequentially connected with，Described Delay computation unit is connected with described digital pre-calibration device and described skeleton and tissue model modeling module respectively；nullAudio input signal carries out digital pre-calibration operation by described digital pre-calibration device，Described operation is according to the characteristic contrary with attenuation effect，The audio signal of input is artificially distorted，Audio signal through artificial distortion is converted into the audio signal of simulation by described digital to analog converter，Reach directly to drive the power level of bone conduction vibrator after process by described second low pass filter and described audio drive amplifiers，Audio signal after drive amplification is converted to the audio signal of vibration mode by described bone conduction vibrator，By skeleton and tissue conduct to auditory nerve，And be perceived by the user，Described bone-conduction microphone detects the signal of described vibration mode，Through described audio frequency amplifier，Audio feedback signal is formed after described first low pass filter and described analog-digital converter，Described Delay computation unit directly generates time delay coefficient based on the pre-correction signal exported from described digital pre-calibration device or generates time delay coefficient based on the pre-correction signal exported from described digital pre-calibration device and described audio feedback signal and input to described skeleton and tissue model modeling module，Described skeleton and tissue model modeling module are according to attenuation effect information described in described time delay coefficient real-time update.

Preferably, described digital pre-calibration device is based on plural number look-up table LUT or based on Volterra model；For plural number look-up table LUT, be suitable to the situation that described bone conduction earphone system is the function of digital audio input signal amplitude, ignore the phase information of input audio signal, according to the data in described observation feedback channel continual renewal form thus carry out adaptive digital precorrection；For Volterra model, by Volterra memory polynomial, bone conduction earphone is modeled, and carry out adaptive digital pre-calibration by updating crucial Volterra coefficient continuously, it is directly realized by by multiplier or is indirectly realized by a Coefficient Look-up Table, and described Coefficient Look-up Table comprises the key coefficient of Volterra model.

This utility model gives the structure of a kind of bone conduction vibrator, the vibration signal of noncontact skin side on its vibration axis direction is only shaken by described bone conduction vibrator, described bone conduction vibrator includes metal conductive layers, internal composite bed and the compound layer that only shakes, described bone conduction vibrator also includes cabinet, described cabinet is internally provided with internal oscillator element, the side of described internal oscillator element is provided with described metal conductive layers, the opposite side of described internal oscillator element is provided with described internal composite bed, described internal composite bed includes internal semimetal layer and internal semi-solid layer；The outside of described internal semi-solid layer is provided with the compound layer that only shakes, and the side of the described compound layer that only shakes is provided with acoustical cotton layer；The described compound layer that only shakes is close to described internal semi-solid layer, and described acoustical cotton layer is close to the compound layer that only shakes.

Preferably, the described compound layer that only shakes includes the first outside semimetal layer, the first outside semi-solid layer, the second outside semimetal layer and the second outside semi-solid layer.

Preferably, described acoustical cotton layer is rubber and plastic material, uses the design of bubble closed pore；The material of described semi-solid layer is butyl rubber, natural rubber, butadiene-styrene rubber, butadiene rubber, neoprene, isoprene rubber, nitrile rubber, EP rubbers or hydrogenation nitrile rubber；Described semimetal layer is aluminium foil or Copper Foil.

Preferably, described bone conduction vibrator is the circular bone conduction vibrator of a diameter of 13mm, thus solves noisy environments interference bone conduction earphone problem.

Preferably, the position of described bone conduction vibrator is carried out self-adaptative adjustment so that it is vibrate at temporal bone before ear, or auricle vibration outside.

Being designed by the structure of this bone conduction vibrator, this utility model also solves bone conduction earphone leakage mail topic

Preferably, the framework of described bone conduction earphone is 3D gull wing type framework such that it is able to solve bone conduction earphone and wearing spectacles collision problem.

Preferably, described bone conduction earphone has skin sensor and microprocessor at contact skin area, when user by bone conduction earphone from the beginning on take off time, described skin sensor senses the change of contact skin situation thus suspends the broadcasting of current audio signals, and makes whole bone conduction earphone enter low-power consumption duty by described microprocessor；When described earphone is put on by user again, described skin sensor senses the change of contact skin situation thus continues the broadcasting of current audio signals, by described microprocessor recovery global function pattern, thus expense electricity problem when solving solution bone conduction channel interrupt.

Preferably, described bone conduction earphone also includes radio communication and audio coding decoding unit, and described radio communication uses bluetooth, WLAN WLAN, purple honeybee Zigbee standard, one or more in LoPAN；Described radio communication and audio coding decoding unit include at least one wireless antenna, audio codec, baseband digital signal processor DSP, microprocessor unit MCU and memory cell.

This utility model also provides for a kind of audio playing apparatus based on bone conduction earphone, described audio playing apparatus is the wired connection mode omitting battery, including bone conduction earphone body, acoustical cotton layer, sponges cover, leakage sound buffer, at least 1 gas conduction microphone, at least 1 bone-conduction microphone, bone conduction drive-by-wire device mainboard, USB power supply interface, audio interface；Inside wherein said headset body, described bone conduction vibrator is fixed at two ends, and said two bone conduction vibrator is connected to described bone conduction drive-by-wire device mainboard by left and right acoustic channels tone frequency channel wire；It is provided with bone conduction driving amplifier, volume control button and at least 1 gas conduction microphone on described bone conduction drive-by-wire device mainboard；The audio input port of described bone conduction drive-by-wire device mainboard connects a tone frequency channel wire, described tone frequency channel wire end is Universal audio interface, the described USB supply port of described bone conduction drive-by-wire device mainboard connects a USB line, and the end of described USB line is a Universal USB adapter.

Preferably, described audio interface is 3.5mm audio connector male, and described USB supply port is general USBTypeA type male, and described USBTypeA type Male head connector is connected by USBOTG transducer.

The mode of this wired connection that this utility model provides, significantly simplifies circuit complexity, decreases manufacturing operation, reduce manufacturing cost；User there is no concern that bluetooth bone conduction earphone use for a long time after electricity deficiency cause using.

It is different that technique scheme provided by the utility model solves different user tissue thickness, and the bone conduction earphone caused experiences different problems, the problem that loudness that especially auditory nerve is experienced is different.Solve user wear bone conduction earphone excessively lax cause sound the problem that volume is too small.This utility model proposes the method for the anti-leak-stopping sound of a kind of novelty according to the vibration performance of oscillator.Solve bone conduction earphone and conflict and the problem of interference are worn for wearing spectacles user, solve the called interference problem of bone conduction earphone in noisy environments.This utility model can be adjusted flexibly, and is a kind of loose shielding, it is allowed to a small amount of ambient sound enters auditory meatus, but bone conduction vibrator vibration signal accounts for main status.The bone conduction gabarit and the interior wealthy size that propose a fixed dimension can meet outside ear, disclosure satisfy that again the effect sealing auricle, designed by Headphone structure, make earphone entirety can be adjusted according to the profile of skull and not affect fixing effect.It is achieved in that both simple, two kinds of wearing regime can be effectively provided again.When solving the interruption of bone conduction transmission channels, the problem of a large amount of energy losses.This utility model detects skeleton or tissue contact automatically, once detects and is not in contact with skeleton or tissue, is then hung up by bone conduction earphone, and terminal music is suspended；Call hold mode.Bone conduction earphone, by novel human body sensor, is controlled, it is achieved that being substantially reduced of its power consumption by this utility model.

Accompanying drawing explanation

In Fig. 1 this utility model, primary electron device connects and signal flow diagram；

The digital pre-calibration adaptive approach related in Fig. 2 this utility model embodiment one offsets attenuation effect and observation feedback channel schematic diagram；

The plural look-up table digital pre-calibration related in Fig. 3 (a) this utility model embodiment one compensates schematic diagram by searching instantaneous amplitude corresponding in bone conduction system and phase information；

Fig. 3 (b) this utility model embodiment one carries out digital pre-calibration operation chart by the complex gain factor pair input signal power of complex amplitude look-up table；

Fig. 4 this utility model embodiment one is based on digital pre-calibration device model and the transmission channel schematic diagram thereof simplifying Volterra memory polynomial；

Fig. 5 this utility model embodiment one digital pre-calibration based on indirect learning mode device schematic diagram；

Fig. 6 this utility model embodiment one digital pre-calibration based on direct learning style device schematic diagram；

Fig. 7 this utility model embodiment two has the bone conduction vibrator schematic diagram of composite bed；

3D gull wing type bone conduction earphone block schematic illustration in Fig. 8 this utility model embodiment three；

In Fig. 9 this utility model embodiment three user wear bone conduction earphone of the present utility model avoid and spectacle frame conflict schematic diagram；

Figure 10 this utility model embodiment four is avoided and eyeglasses-wearing conflict, provides external auditory meatus to close measure schematic diagram in noisy environments；

Bone conduction earphone structure and skin sensor position of the switch schematic diagram in Figure 11 this utility model embodiment five；

Figure 12 this utility model embodiment five detects contact skin state and operational flowchart automatically；

Radio communication and audio coding decoding unit block diagram in Figure 13 this utility model embodiment five；

The schematic diagram that in Figure 14 this utility model embodiment six, wired connection realizes.

Detailed description of the invention

Further illustrate the technical solution of the utility model below in conjunction with the accompanying drawings and by detailed description of the invention.

Embodiment one:

Using during bone conduction earphone, different user tissue thickness is different, and the bone conduction earphone caused experiences different problems, the problem that loudness that especially auditory nerve is experienced is different.In addition, it is desirable to it should be noted that skeleton and tissue can produce amplitude fading and the time delay with frequency selectivity to vibration signal.Therefore, the audio signal in high-fidelity or broadband is difficult to arrive auditory nerve by bone conduction.In the prior art, situation to narrowband audio signal, the problem of this frequency selective attenuation can provide more audio signal surplus (greater power or bigger volume) by source of sound, or selects optimal propagation path or skin contact location to solve.But, this method poor effect, and secondary problem can be caused, such as, bigger power can increase bigger energy content of battery loss affects stand-by time, simultaneously need to bone conduction vibrator power grade is higher, device size is heavier.But, the more important thing is that these technology cannot ensure that the signal being transmitted to auditory nerve is through equilibrium (the most all frequency components are consistent with the frequency component in source of sound), this may result in audio signal serious distortion, has a strong impact on tonequality and the timbre performance of bone conduction earphone.For audio frequency of broad band signal or high definition voice, this situation can become more acute, and the serious distortion that this decay causes can become readily apparent from.

In order to compensate the attenuation effect of frequency dependence, this utility model embodiment provides and carries out precorrection by digital audio and video signals and realize.Its principle is one audio signal contrary with skeleton and tissue attenuation characteristic of compensation on transmission channel.Signal above this transmission channel is properly termed as digital pre-calibration signal, and the functional module producing this signal is referred to as digital pre-calibration device.The dampening information that digital pre-calibration device actually provides according to observation feedback channel, to human skeleton and its transmission function of tissue construction, then seeks its inverse function to this transmission function.This inverse function can characterize the feature contrary with human skeleton and tissue attenuation effect, by digital pre-calibration device, this feature is added in the middle of the digital audio and video signals of input, amplified by digital-to-analogue conversion, audio frequency, bone conduction vibrator is converted to vibration signal, skeleton and tissue conduct, so, in audio frequency, pre-correction signal will be attenuated effect and thoroughly offsets, and the vibration signal arriving auditory nerve represents the audio frequency characteristics consistent with source of sound.This point, is this utility model principal character of being different from prior art, as shown in Figure 1.

Behavior of the present utility model is offset in transmission channel by the inversion model of bone conduction transmission channel behavior implemented because with the skeleton of frequency dependence and tissue attenuation effect for the decay of bone conduction vibrator behavior and distortion.This concept is based between described digital audio input signal and described bone conduction vibrator one nonlinear transmission function of insertion, and this transmission function is precisely skeleton and the inverse function of tissue attenuation vibration signal transmission function.So to offset the distortion caused when vibration signal arrives auditory nerve because of the frequency selective attenuation in path.So, this utility model can produce highly linear transmission Function feature between digital audio and video signals input and auditory nerve, realizes HD Audio transmission, and for wideband audio signal, effect becomes apparent from.This utility model needs according to the skeleton of user and organizes different decay characteristics, different and skimble-scamble wearing mode, and this bone conduction system carries out adaptive dynamic adjustment, and this dynamic adjustment is by closed loop system control realization.This utility model has an observation feedback channel, for the differential declines effect function of real-time detection different user, the impacts that cause different with wearing mode, as shown in Figure 2.Such as: user's is fat or thin, the degree of tightness of wearing mode, when wearing, bone conduction vibrator is apart from changing factors such as the positions of auditory nerve.

As in figure 2 it is shown, do not have the digital audio input signal of any distortion to first pass through digital pre-calibration device carry out digital filtering operation.The audio signal of input artificially can be distorted by this operation according to the characteristic contrary with attenuation effect.Digital audio and video signals through artificial distortion can be converted into the audio signal of simulation by digital to analog converter, reaches directly to drive the power level of bone conduction vibrator after the process by low pass filter and audio drive amplifiers.Driving signal is converted to vibration signal by bone conduction vibrator, by conducting to auditory nerve in skeleton and tissue, and is perceived by the user.In this process, the vibration signal of bone conduction vibrator needs through skin, fat, muscular tissue, the frequency selective attenuation of skeleton etc..But, exactly because have been added in the artificial distortion of opposite characteristic at digital pre-calibration device, this decay can thoroughly be balanced out, so the vibration signal that obtains of auditory nerve is consistent with system digits audio input signal in theory.Which achieves the high-fidelity performance of system.

In order to realize the bone conduction system of this highly linear, digital pre-calibration device has possessed rational process signal, and can carry out the ability of self adaptation computing.In Fig. 2, skeleton and organization modeling and computing module can create an accurate frequency selective attenuation effect model.Nonlinear bone conduction transmission channel (being input to auditory nerve from digital audio and video signals) can accurately be simulated by this model.Meanwhile, this utility model is additionally used an observation feedback circuit passage and is detected the bone conduction signal being attenuated by bone-conduction microphone, updates for carrying out adaptive polo placement and real-time model parameter.This observation feedback channel self possesses High Linear characteristic.So, embodiment of the present utility model has following 4 steps.

First, need the model (passage from digital audio input signal to auditory nerve) of a bone conduction earphone transmission channel.So ensure that attenuation effect can be embodied in this passage thoroughly.In addition, other distortion any, such as: non-linear being required for non-linear, bone conduction vibrator non-linear, audio frequency amplifier of analog-digital converter (DAC) is characterized by this model.But, the important requirement of this model another one is exactly that the feature needing algorithm to possess low-complexity is come convenient to carry out.Volterra model, Wiener model, Hammerstein model, Saleh model can be applied in this utility model as digital pre-calibration device structure.Wherein, because Volterra model can provide the most powerful modeling ability and may be used in the middle of the dynamic system of self adaptation, we preferentially use this model to make digital pre-calibration device.But, for bone conduction earphone is applied, the complexity of Volterra model is the hugest, and computing capability requires too high, is unfavorable for technology implementation.Therefore, the utility model proposes two kinds simplify complexity method to realize digital pre-calibration device: the Volterra model simplified and the method for look-up table (LUT).First, the method simple, intuitive of look-up table, it is described transmission function by pointwise, is obtained the output valve of corresponding input value by the corresponding relation in look-up table.

Second, after modeling to digital pre-calibration device, in addition it is also necessary to design a digital correcting filter and compensate the attenuation effect of various distortion and frequency dependence.

3rd, the parameter of bone conduction earphone model can carry out adaptive identification and calculating.By an adaptive recognition algorithm, it is possible to obtain update the new parameter of digital pre-calibration device, adjust the parameter that headphone compensation is decayed in real time.Essentially, this adaptive recognition algorithm is a kind of general on-line optimization algorithm, but, this utility model is not limited to certain specific optimized algorithm.

4th, the system integration needs to carry out authentication function by experiment, and calibration obtains the most initial model parameter.By above 4 steps, the non-ideal factor in transmission channel can be detected by this utility model in theory by observation feedback channel, and in real time, automatically compensates.These non-ideal factors include: difference, the degree of tightness etc. of wearing mode naturally of loudness, the audio distortion of frequency dependence, electronic device distortion, skeleton and tissue.

The present embodiment proposes two kinds of methods and realizes the digital pre-calibration function of transmission channel.Both approaches is to look for table LUT and Volterra model respectively.The former realizes simply, and function is limited, it is adaptable to the design that hardware computing resource is limited；The latter is powerful, relative complex, it is adaptable to functional requirement is high, the design that hardware computing resource is sufficient.First, look-up table LUT is method based on plural number look-up table.It comprises the inverse transfer function of attenuation effect.This method realizes adaptive calibration result by the data in observation feedback channel continual renewal form.LUT Method is applicable to the situation that bone conduction system is the function of digital audio input signal amplitude, and it ignores the phase information of input audio signal.Another method is Volterra model, and bone conduction earphone is modeled by it by Volterra memory polynomial, and realizes adaptively correcting by updating the Volterra coefficient of some most criticals continuously.This correction both can be directly realized by by multiplier, it is also possible to is indirectly realized by a Coefficient Look-up Table.This Coefficient Look-up Table is different with the look-up table mentioned before, because its content is the key coefficient of Volterra model.This utility model can realize an inverse transfer function simplified by a Volterra memory polynomial simplified.While it is true, the method that this utility model is not limited to above two modeling, other is any all can be able to be suitable for for this utility model the method for nonlinear system modeling.

First the technology implementation of first look-up table model is introduced, as shown in Fig. 3 (a) (b).This plural number look-up table configuration depends on complex number audio input signal to realize the function of digital pre-calibration.In this utility model, because the characteristic of bone conduction earphone is it is believed that the function of only digital audio input signal amplitude, so the non-linear phenomena (device distortion, bone attenuation etc.) occurred in bone conduction earphone is corrected, can be realized by one-dimensional look-up table.This one-dimensional look-up table can approximate the nonlinear inverse function of bone conduction earphone by the table entries of limited quantity.As shown in Fig. 3 (a) (b), because in vibration signal, the interference of phase place is the most inconspicuous, so this utility model does not carry out record by two look-up tables to amplitude and the phase place of vibration signal respectively, but by a plural charting amplitude information.This plural number form can realize the digital pre-calibration to signal by the operation more less than existing look-up table.It utilizes the power R=of digital audio and video signals input signal | I_in+j·Q_in|²Refer to complex gain G of unique corresponding digital pre-calibration device in this utility model look-up table_LUT(R).Complex gain G of this digital pre-calibration device_LUT(R) can be by look-up table corresponding to input signal V_in=I_in+j·Q_inAddress be determined.Therefore, digital pre-calibration device be output as a plural number amass: V_out=V_in·G_LUT(R).The information provided by observation feedback channel carries out model prediction, this G_LUT(R) characteristic constantly can adjust along with the non-linear factor worn in real time, the most just ensure that the realization of adaptivity.Therefore, this method can be greatly reduced the complexity in engineering construction and adaptometer evaluation time.By upper figure it can be seen that digital pre-calibration device based on complex gain look-up table is actually a digital multiplier.It carries out adaptive during, it is for the observation phase place of feedback channel signal inconspicuous.So, observation feedback channel is not required to phase-adjusting circuit to ensure system stability, thus, this method can ensure that the robustness (Robust) of whole bone conduction earphone digital pre-calibration system.It addition, size and the adaptive speed of look-up table are linear in the method.If improving adaptive response speed, it is necessary to reduce the quantity of entry in look-up table as far as possible.Can inverse function nonlinear to bone conduction earphone the most perfectly follow the tracks of it is to say, the number of entries of complex gain look-up table decides digital pre-calibration device.The number of entries of complex gain look-up table decides maximum signal to noise ratio (SNR) ability that can obtain of bone conduction earphone in this utility model.

The second method that the present embodiment proposes is to be modeled the nonlinear characteristic of bone conduction earphone by Wiener or Volterra model.Wherein Wiener model can be regarded as a kind of the simplified mode of Volterra model.Wiener model includes linear finite impulse response (FIR) (FiniteImpulseResponse, a FIR) wave filter and a memoryless nonlinear lookup table.Model parameter estimation is excessively complicated for Wiener model, so this utility model is recommended to use memory polynomial based on the Volterra model simplified to realize, as shown in Figure 4.This simplify by diagonal term in Volterra sequence is carried out zero setting process obtain.This method can reasonably be compromised software and hardware resource, beneficially engineering construction, and the digital pre-calibration device using this memory polynomial technology is as follows:

$z\left(n\right)=\underset{k=1}{\overset{K}{\Σ}}\·\underset{q=0}{\overset{Q-1}{\Σ}}{c}_{kq}\·x(n-q)\·|x(n-q){|}^{k-1}---\left(1\right)$

Here K represents the non-linear exponent number of bone conduction earphone；Q represents the memory depth of memory polynomial.By formula (1), the non-linear function that can be modeled as digital audio input signal amplitude | x | of bone conduction earphone, characterized by a complex polynomial.This complex polynomial is attempted going to mate the non-linear of bone conduction earphone by FIR filter structure.This is a pure recursive models, because this model does not explicitly try to be modeled the non-linear of certain concrete bone conduction earphone.

In order to reduce the technology implementation complexity of digital pre-calibration device, ensureing that performance is up to standard, the non-linear odd item only retained in memory polynomial can reduce whole digital pre-calibration device 40% circuit complexity simultaneously.If by plural number look-up table and compared based on the technology implementation simplifying Volterra memory polynomial, its difference is as shown in table 1.

Table 1 contrasts plural number look-up table and simplifies the digital pre-calibration device that the memory polynomial of Volterra model realizes

In observation feedback channel, most important function is alignment transmitting and feedback signal, carries out parameter estimation.Completing the two the most accurately to process, guarantee digital pre-calibration device coefficient self adaptation realizes real-time parameter adjustment.Wherein the target of parameter estimation is to select adaptation coefficient, and such bone conduction earphone is transmitted to the signal of auditory nerve and just can try one's best close to digital audio input signal.But, because skeleton and tissue attenuation are main problems, parameter estimation need to carry out coefficient is selected to ensure bone conduction system can the transmission vibration signal of high-fidelity to auditory nerve.In order to distinguish the attenuation effect of skeleton and tissue and bone conduction earphone circuit respectively to nonlinear contribution, parameter estimation needs observation feedback signal based on alignment to carry out.The process of aligned signal needs the parameters such as the amplitude of matched signal, time delay, phase fluctuation.Therefore, the nonlinear effect that digital pre-calibration device can correct is targetedly.

For digital pre-calibration device coefficient update algorithm, this utility model is not limited to certain concrete algorithm, selects to be changed according to concrete application scenarios.Such as: least-squares estimation (LSE), lowest mean square (LMS), normalized LMS (NLMS), recursive least-squares (RLS) and QR based on RLS decompose (QRD RLS) etc..Under normal circumstances, LSE method requires logarithm value matrix inversion, needs Large Copacity internal memory and powerful disposal ability.But, LMS is it can be avoided that such matrix inversion operation.The advantage of RLS method be its convergence rate than LMS and NLMS faster to realize the Automatic adjusument of real-time coefficient.On the other hand, the shortcoming of above-mentioned algorithm is that process numerical stability problem carries out calculating the demand causing calculating resource in a large number with the correlation matrix entering data.Wherein, QRD RLS is more healthy and stronger than above-mentioned algorithm and stable, and is suitable for hardware and realizes.

In the technology implementation of observation feedback channel, there are two kinds of methods that parameter is estimated.The first is the framework of indirect learning, as shown in Figure 5.It realizes parameter estimation by two identical Volterra model memory polynomial of simplifying.The two memory polynomial one is positioned on transmission channel, and another one is positioned on observation feedback channel.As it is shown in figure 5, the target of digital pre-calibration device is the recognition subsystem finding the conversion of signal z ' (n) to realize producing high-fidelity output y (n) at auditory nerve.By stochastic gradient adaptation mechanism, this method can follow the tracks of and identify the time dependent feature of bone conduction earphone vibration signal.This adaptive process includes two links: first link is in initialization procedure, and system output signal carries out perception by bone-conduction microphone, and the adaptation procedure of the coefficient of memory polynomial is realized by the parameter estimation algorithmic approach of off-line.This process is the initialization procedure that indirect learning mode is necessary.Once sef-adapting filter is initialised in optimal stationary point, and this utility model can follow the tracks of the nonlinear characteristic of the time-varying of bone conduction earphone by a random adaptation mechanism.In this utility model, the scheme of indirect learning needs two copies of digital pre-calibration to create the inverse function of earphone model.Its correction factor, only after algorithmic statement, just can be updated by transmission channel digital corrector.

Two digital pre-correction signal z ' (n) and z (n) are compared to produce an error signal e (n).This polynomial coefficient, by making e (n)=0 calculate acquisition, so can realize y (n)=x (n).This coefficient produces at observation feedback channel, and in the digital pre-calibration device of transmission channel, until training module carries out coefficient update next time.

The initialization of digital pre-calibration function realizes by optimizing filter function.Detailed process is that the calculating carrying out an off-line in digital pre-calibration device obtains.Adaptive filter coefficient estimation can be considered as a linear optimization task.Any general parameter estimation algorithm, such as LSE, LMS, NLMS, RLS, QRD RLS and other can apply in this utility model.Although it should be noted that above-mentioned method is all to try to solve an optimized problem, namely linear dimensions estimation, but the point of safes that obtains of these algorithms may all and differ.This is because the error criterion for algorithms of different is skimble-scamble.Although outstanding nonlinear compensation effect can be by the method acquisition of indirect learning, the effectiveness that the numeral being positioned in observation feedback channel trains this " translation " method of corrector to obtain renewal coefficient is normally based on thinks that nonlinear system cascade is the hypotheses that can exchange.And this mode, it is frequently not and all systems are all suitable for.Therefore, this utility model also proposes the mode of a kind of direct study for obtaining the coefficient update of digital pre-calibration device, as shown in Figure 6.The identification of this method permission digital pre-calibration device and adaptive process depend only on the model of bone conduction, such as, simplify Volterra memory polynomial model.The inverse function of this non-linear bone conduction system can realize adaptive tracking by stochastic gradient method and obtain, but this utility model is not limited to this stochastic gradient method carries out technology realization.

As shown in Figure 6, the input of bone conduction system and output can be compared by digital pre-calibration technology based on directly study, to produce the coefficient updated.After parameter estimation algorithm is restrained, under the effect of digital pre-calibration device, the output of bone conduction earphone the most no longer contains distortion and loudness loss.Directly study obtains the advantage of adaptive updates coefficient is to have only to a digital corrector rather than as two in indirect learning mode.But identical point is the renewal that the figure adjustment coefficient of transmitting path only just carries out coefficient after algorithmic statement.It should be noted that use direct learning style bone conduction system need to output and input compare.Such as, one group of data [z (n), y (n)] can be stored in the middle of a look-up table (LUT).Numeral training school device can use multinomial to estimate the curve-fitting data in LUT, and coefficient is to obtain the inverse function of bone conduction system model.It produces the coefficient of memory polynomial by solving least square problem.After meeting condition y (n)=x (n), multinomial coefficient becomes stable after algorithmic statement.The digital pre-calibration device that the coefficient produced in observation feedback network can be used in transmitting path, until being updated by the acquisition next one of parameter estimation module.Wherein, estimation difference represents the degree of the close true bone conduction earphone behavior of set up bone conduction earphone model.

Embodiment two:

In all bone conduction technologies, audio frequency is dependent on what vibration signal realized in skeleton (solid) transmission.As long as the solid that is touched on direction of vibration, sound can be transmitted.So, in bone conduction earphone design process, because the structure of fixing bone conduction vibrator uses solid to constitute, so it also can transmit vibration, even drive the air of surrounding to produce secondary vibration, ultimately cause Lou sound phenomenon.So, a lot of prior aries think that leakage sound is the very difficult that avoid of bone conduction and the difficult problem solved.Prior art is devoted to optimize the generation of bone conduction vibration, the research controlling and eliminating always., the vibration of all of solid all can produce sound, would not have the conduction of sound without vibration, and bone conduction technology cannot realize.Therefore, this utility model is innovated for the inherent character of bone conduction vibrator, it is proposed that a kind of will vibration to the method being minimized, this only technology of shaking can eliminate completely bone conduction earphone leakage sound problem.Generally the vibration of bone conduction vibrator is axial.That is the vibration signal on the direction in axle center occupies leading, with axle center orthogonal direction on vibrate more weak.So this utility model is concentrated on axis direction, the vibration signal of noncontact skin side only shakes, and realizes the problem eliminating leakage sound of only shaking.Because the vibration on non axial is less for the contribution of leakage sound, so ignoring its impact.

It is to be combined by metal level and semisolid to eliminate interference vibration (causing the vibration of bone conduction earphone leakage sound) that this utility model stops the core of technology of shaking.Because some specific semisolid has good performance of only shaking, the conduct vibrations metal medium being well combined by it, carry out the isolation of bone conduction vibrator is only shaken.In this utility model, the compound layer that only shakes is highdensity damping rubber layer, and surface attachment aluminium foil is constituted, and can be overlapped with composite bed, and superposition quantity determines possess obstruct, the effect of absorption of noise according to the effect of its suppression bone conduction leakage sound.Can also have the acoustical cotton layer of one layer of rubber and plastic material outside composite bed, bubble closed pore designs, and is mainly used in absorbing leakage sound.Superposition order is, composite bed is close to bone conduction vibrator, and acoustical cotton layer is close to composite bed.Only shake as it is shown in fig. 7, leakage sound vibration is damped by this utility model by composite bed and acoustical cotton.During namely solid vibration, the energy making solid vibrate is dissipated in the method in damping layer as much as possible.Damping refers to hinder the relative motion of object and kinergety is converted into heat energy or other can be with a kind of effect of dissipation energy.Damping can reduce the resonance amplitude of frame for movement, reduces because of acoustic radiation produced by mechanical vibration, reduces bone conduction earphone leakage sound.During bone conduction earphone work, for leakage tone signal, the vibration of certain frequency can be produced when metallic conductance bed device being carried out collision along bone conduction vibrator gravity axis direction, because metal is good conduct vibrations medium, axial vibration signal can be evenly dispersed on its area as far as possible, so the vibration signal in unit are is equivalent to be averaged and reduce, but do not absorbed.Meanwhile, metal level and semi-solid layer fit tightly, vibration signal in metal level one side can be transmitted on semi-solid layer equably, if metal and the semi-solid composite bed constituted do not have External Force Acting, the vibration that bone conduction vibrator excites will progressively decay, the speed of decay depends on the amount of decrease of semisolid material, will obtain formula below according to Newton's law:

Quality+resistance+elastic force=0；(1)

If ignoring amount of decrease to disregard, the natural frequency that can obtain semi-solid layer is as follows:

$f_0=\frac{1}{2\·\mathrm{\π}}\·\sqrt{\frac{C}{M}}---\left(2\right)$

Wherein, f₀Represent the natural frequency of semi-solid layer；C represents the spring rate of semi-solid layer；M represents semi-solid layer quality.When the impact force of vibration can produce twisting vibration away from center of gravity, semi-solid layer in three axles, and respective angular frequency is:

${\mathrm{\ω}}_D=\frac{C_V}{J}---\left(3\right)$

Wherein, ω_DRepresent angular frequency；C_VRepresent torsional rigidity；J represents inertia.

Semi-solid layer in this utility model has the characteristic that the resonance gradually strengthened is reduced to certain level under normal circumstances, and the isolation of semi-solid layer only shakes efficiency equal to excited frequency/natural frequency i.e.:WhenTime, exciting force is by minimizing and is far not equal to natural frequency, and semi-solid layer will play the effect of isolation vibration, and when η=3, the effect of only shaking of semi-solid layer is up to 80%, say, that only the exciting vibration of 20% is being conducted.Therefore, the semi-solid layer in this utility model can substitute for metal spring of the prior art and plays weakening, absorbing effect.Its main performance requirement is in Static stiffness, dynamic stiffness, endurance quality.Semi-solid layer in this utility model is thick substances between a solid and a liquid, and it possesses following characteristics:

(1) being combined by multiple material, same shape is adjusted by material can have different performances.

(2) friction between semi-solid layer interior molecules makes it have certain damping capacity, the hysteresis quality (in loading process, the deformation hysteresis of semi-solid layer is in the stress of semi-solid layer) i.e. moved.

(3) semi-solid layer all can produce different coefficient of elasticity in compression, shearing, drawing process.

In this utility model, the material of semi-solid layer is configured to rubber.Because damping and amortization is required big by bone conduction earphone leakproof sound, so, butyl rubber (IIR) material possessing preferable damping capacity is optimum semisolid material.It can alleviate the power that leakage sound vibration dispersion gets off, and will not produce bigger cohesiveness.But this utility model is not limited to butyl rubber (IIR) material, other available rubber is natural rubber (polyisoprene, NR); butadiene-styrene rubber (SBR), butadiene rubber (BR), neoprene (CR); isoprene rubber (IR); nitrile rubber (NBR), EP rubbers (EPDM), hydrogenation nitrile rubber (HNBR) etc..

And except semi-solid layer in this utility model, also introduce the concept of metal level, it combines with semi-solid layer and can realize a composite bed, and this composite bed, as the basic leakproof sound unit that only shakes, can realize the elimination of leakproof sound by the way of multiple composite bed superpositions.Metal level is aluminium foil or Copper Foil, but be not limited to that both metals.And, this composite bed both can design and be placed on inside bone conduction vibrator, it is also possible to be arranged on outside bone conduction.So, at least 1 composite bed of this utility model interiorly or exteriorly carries out the operation axially only shaken in bone conduction vibrator.Generally speaking, this composite bed prevent bone conduction leakage sound principle as follows:

(1) homogenization vibration: by this good conduct vibrations medium of metal level, original axial high strength vibration signal can be evenly distributed on a bigger area, so what the vibration signal of unit are actually reduced.

(2) absorb vibration: composite bed of the present utility model may be used for bone conduction vibrator internal vibration element and the connection of shell, can be described as internal composite bed.Under this state, internal vibration element is vibration source, the effect of internal composite bed be absorb its fit in the axial direction shell time the vibration that produces, avoid being delivered to leakage sound the outside of bone conduction vibrator, also can slightly reduce the vibration of internal vibration element self, the external diameter of internal composite bed is less than the external diameter of bone conduction vibrator simultaneously.

(3) abatement vibration: composite bed of the present utility model can be used for the connection between bone conduction vibrator and headphone frame, it is properly termed as outside composite bed, under this state, whole bone conduction vibrator is vibration source, the effect of outside composite bed is the vibration that bone conduction vibrator and headphone frame produce to be cut down rapidly by high-damping effect, prevents from vibrating being produced by headphone frame vibration air and leaks sound.The external diameter of outside composite bed is more than or equal to the external diameter of bone conduction vibrator.

Embodiment three:

In the prior art, all of rear mounted bone conduction earphone framework be required for tightly be attached to skeleton and tissue above, and form certain oppressive force, ensure that bone conduction vibrator can be effectively by vibration transmission audio signal.But, this structure has a defect clearly, that is, the headphone frame fitted tightly can form serious conflict with the spectacle frame of the user of wearing spectacles.Bone conduction earphone has already taken up the space that the space at spectacle frame place, especially leg of spectacles need.Typically result in the user of wearing spectacles to want to wear prior art bone conduction earphone and cause serious inconvenience.Or bone conduction earphone wear unreasonable cause headset user experience poor, or eyeglasses-wearing is unreasonable, the two may be used to bring the risk come off, especially wearing spectacles and earphone to carry out situation about moving to user simultaneously, both can not fixedly secure, safe risk may be brought.

This utility model achieves comfortable wearing mode by 3D gull wing type (GullWing) bone conduction earphone framework, user especially for wearing spectacles, earphone of the present utility model can be dodged region by specific leg of spectacles and be avoided the conflict of headphone frame and leg of spectacles, as shown in Figure 8.The bone conduction earphone framework of conventional, prior art is all close to user's skull, and forms certain oppressive force, and such guarantee bone conduction vibrator skeleton that is attached to tightly effectively transmits audio frequency with tissue.Because front portion proposes one based on digital pre-calibration device to loudness, distortion in this utility model, wear the method that degree of tightness compensates, so bone conduction earphone structure of the present utility model significantly can make a distinction with prior art.This utility model need not headphone frame tightly be posted on skeleton and tissue, and be available to spectacle frame one and dodge region, so headphone frame of the present utility model uses open, loose design, its shape as the wing of sea-gull to both sides expansion.So, one that user can be made to wear is more comfortable, does not has framework to oppress head, and two are that of avoiding the conflict of leg of spectacles and headphone frame, wear safer, firmly, as shown in Figure 9.

Embodiment four:

Because this utility model headphone frame based on 3D gull wing type structure and bone conduction earphone frame can be liberated by digital pre-calibration device, it is achieved that loose wearing mode.So, the 3D gull wing type structure in this utility model have another one advantage just can be by 3d space displacement realize bone conduction earphone close external auditory meatus, it is to avoid the function of ambient noise interference, as shown in Figure 10.This cannot realize in the prior art, because they do not possess 3D gull wing type framework and numeral presetter the two premise.Additionally, realize closing external auditory meatus, the size of bone conduction vibrator needs strict selection, external auditory meatus can be closed, simple fixation can be carried out again according to the structure of auricle, through research organization of human body, the circular bone conduction vibrator that the utility model proposes 13mm closes external auditory meatus optimum in this utility model.So 13mm, can circular bone conduction vibrator, be also to realize the jamproof important parameter of noisy environments in this utility model.How this utility model is converted to ear canal and wears from normally wearing, wearing mode such as Figure 10.

Embodiment five:

When this utility model solves the interruption of bone conduction transmission channels, the problem of a large amount of energy losses.This utility model detects skeleton or tissue contact automatically, once detect and be not in contact with skeleton or tissue, then bone conduction earphone is hung up, prevent the vibration of the power that bone conduction earphone is bigger when being not exposed to user, cause the waste of power, the terminal music of communication is suspended, hold mode of conversing.Bone conduction earphone, by novel human body sensor, is controlled, it is achieved that being substantially reduced of its power consumption by this utility model.

This utility model has skin sensor, bone conduction earphone structure and skin sensor position of the switch schematic diagram as shown in figure 11 at contact skin area.When user bone conduction earphone from the beginning on take off when, skin sensor sense the change of contact skin situation it will automatic pause music, and by the microprocessor on mainboard make whole bone conduction earphone enter low-power consumption duty.When user puts on and may proceed to play again, and recover global function pattern.Thus, when the user discover that people with he speak or worry pack up bone conduction earphone when, as long as earphone is taken off the most permissible, save operational motion, also do not worry that concert continues to play, it is most important that the bone conduction earphone originally comparing power consumption can be made to enter power saving park mode.Skin sensor and bone conduction vibrator are in parallel, and on a contact plane, this skin sensor ensures that bone conduction vibrator leaves skin, and it also leaves skin.Bone conduction vibrator contact skin, it also contacts skin.Whether skin sensor actually detection bone conduction vibrator fits the switching signal sensor of skin.In this utility model, the technology that realizes of skin sensor is not limited to one, it is possible to use technology have, distribution capacity sensor, skin pricktest effect sensor etc..In this utility model, skin sensor can combine with pressure transducer and whether user is taken off bone conduction earphone detect.The flow process of detection is as shown in figure 12.

As shown in figure 13, Digital Signal Processing and transmitter unit include the transceiver (TRX) of wireless connections, such as bluetooth, WLAN (WLAN), purple honeybee (Zigbee) standard, LoPAN or other communication；At least one wireless antenna, Audio Processing includes encoder (codec), audio drive amplifiers, to drive described bone conduction vibrator, baseband digital signal processes (DSP), for the performance strengthened, such as noise eliminates, characteristics of signals and quality control etc., microprocessor unit (MCU) is used for calculating and control its peripheral module as master control, memory cell includes read only memory (ROM) and random access memory (RAM), and rechargeable battery is connected to above-mentioned circuit main board.

Embodiment six:

This utility model is not limited to communication and realizes the function of bone conduction earphone, and in addition, wired mode is applied equally to this utility model.This utility model cable technology embodiment need not battery, wireless communication unit, antenna, as shown in figure 14.Such benefit is that (1) simplifies circuit complexity significantly, decreases manufacturing operation, reduces manufacturing cost；(2) user there is no concern that bluetooth bone conduction earphone use for a long time after electricity deficiency cause using.Cable technology enforcement itself need not battery and powers.The external equipment that its power supply supply connects from it, such as PC (PC), mobile device.

The active wired bone conduction earphone that the utility model proposes is made up of following components: 3D gull wing type headset body, digital pre-calibration device mainboard, left and right acoustic channels tone frequency channel wire, bone conduction vibrator, sponges cover, leakage sound buffer, at least 1 bone-conduction microphone, bone conduction drive-by-wire device mainboard, USBOTG power supply interface, 3.5mm audio interface, USBOTG transducer forms.Inside headset body, bone conduction vibrator is fixed at two ends.Unlike implementing from wireless technology, cable technology does not has circuit main board and battery in implementing thus has saved cost.Two bone conduction vibrator are connected to bone conduction drive-by-wire device mainboard by left and right acoustic channels tone frequency channel wire.This drive-by-wire device mainboard is actually the circuit main board of a compact version, only retains the pick up that a bone conduction driving amplifier, volume control button and at least 1 gas conduction microphone are constituted.The audio input port of drive-by-wire device mainboard connects a tone frequency channel wire, and end is general 3.5mm audio connector male (AVJack).The supply port of drive-by-wire device mainboard connects a USB line, and end is a general USBType A type Male head connector.Type A type interface conversion can be that other arbitrarily can be to support style connector form, such as MicroUSB adapter, i Phone data connector etc. by USBOTG transducer by USBType A type Male head connector.In the case of electrical connection sexual satisfaction condition, USBOTG converter is not limited to certain specific interface shape.

In use, connection equipment is needed to provide a 3.5mm audio connector female and one can support OTG, it is provided that the data interface connector female that 3.3V or 5V powers.This utility model cable technology is implemented, connected by 3.5mm audio frequency, USBOTG adapter is connected with equipment with transducer, respectively audio frequency and power supply are transmitted, the audio signal that equipment is exported and the input powered as bone conduction drive-by-wire device mainboard, after audio signal is amplified by drive-by-wire device, reach bone conduction vibrator acceptable signal power level, directly by left and right acoustic channels tone frequency channel wire, drive bone conduction vibrator conduction audio frequency to arrive auditory nerve respectively.

Preferred implementation of the present utility model is described in detail above in association with accompanying drawing; but; this utility model is not limited to the detail in above-mentioned embodiment; in technology concept of the present utility model; the technical solution of the utility model can be carried out multiple simple variant, these simple variant belong to protection domain of the present utility model.

It is further to note that each the concrete technical characteristic described in above-mentioned detailed description of the invention, in the case of reconcilable, can be combined by any suitable means.In order to avoid unnecessary repetition, various possible compound modes are illustrated by this utility model the most separately.

Additionally, can also carry out combination in any between various different embodiment of the present utility model, as long as it is without prejudice to thought of the present utility model, it should be considered as content disclosed in the utility model equally.

Claims (11)

1. a bone conduction earphone, it is characterized in that: described bone conduction earphone includes headset body, skeleton and tissue model modeling module and numeral presetter it is provided with in described headset body, described skeleton and tissue model modeling module detect the skeleton of different user and the attenuation effect information of tissue in real time, there is provided described attenuation effect information parameter to described digital pre-calibration device, described digital pre-calibration device obtains the audio signal of input, based on described attenuation effect information, described audio signal is carried out digital pre-calibration process.

nullBone conduction earphone the most according to claim 1，It is characterized in that: described bone conduction earphone also includes Delay computation unit、Digital to analog converter、Analog-digital converter、First low pass filter、Second low pass filter、Audio frequency amplifier、Audio drive amplifiers、At least one bone-conduction microphone and at least one bone conduction vibrator，Wherein，Described Delay computation unit、Described digital to analog converter、Described analog-digital converter、Described first low pass filter、Described second low pass filter、Described audio frequency amplifier、Described audio drive amplifiers is arranged in described headset body，At least one bone-conduction microphone described，Described audio frequency amplifier，Described first low pass filter，Described analog-digital converter，Described skeleton and tissue model modeling module，Described digital pre-calibration device，Described digital to analog converter，Described second low pass filter，Described audio drive amplifiers，At least one bone conduction vibrator described is sequentially connected with，Described Delay computation unit is connected with described digital pre-calibration device and described skeleton and tissue model modeling module respectively；nullAudio input signal carries out digital pre-calibration operation by described digital pre-calibration device，Described operation is according to the characteristic contrary with attenuation effect，The audio signal of input is corrected，Corrected audio signal is converted into the audio signal of simulation by described digital to analog converter，Reach directly to drive the power level of bone conduction vibrator after process by described second low pass filter and described audio drive amplifiers，Audio signal after drive amplification is converted to the audio signal of vibration mode by described bone conduction vibrator，By skeleton and tissue conduct to auditory nerve，And be perceived by the user，Described bone-conduction microphone detects the signal of described vibration mode，Through described audio frequency amplifier，Audio feedback signal is formed after described first low pass filter and described analog-digital converter，Described Delay computation unit directly generates time delay coefficient based on the pre-correction signal exported from described digital pre-calibration device or generates time delay coefficient based on the pre-correction signal exported from described digital pre-calibration device and described audio feedback signal and input to described skeleton and tissue model modeling module，Described skeleton and tissue model modeling module are according to attenuation effect information described in described time delay coefficient real-time update.

Bone conduction earphone the most according to claim 2, it is characterised in that: described digital pre-calibration device is based on plural number look-up table LUT or based on Volterra model；For plural number look-up table LUT, be suitable to the situation that the transmission system of described bone conduction earphone is the function of digital audio input signal amplitude, ignore the phase information of input audio signal, according to observation feedback channel continual renewal form in data thus carry out adaptive digital precorrection；For Volterra model, by Volterra memory polynomial, bone conduction earphone is modeled, and carry out adaptive digital pre-calibration by updating crucial Volterra coefficient continuously, it is directly realized by by multiplier or is indirectly realized by a Coefficient Look-up Table, and described Coefficient Look-up Table comprises the key coefficient of Volterra model.

Bone conduction earphone the most according to claim 1 and 2, it is characterized in that: described bone conduction vibrator is the circular device of a diameter of 13mm, the vibration signal of noncontact skin side on its vibration axis direction is only shaken, described bone conduction vibrator includes cabinet, metal conductive layers, internal composite bed and the compound layer that only shakes；Described cabinet is internally provided with internal oscillator element, the side of described internal oscillator element is provided with described metal conductive layers, the opposite side of described internal oscillator element is provided with described internal composite bed, and described internal composite bed includes internal semimetal layer and internal semi-solid layer；The outside of described internal semi-solid layer is provided with the compound layer that only shakes, and the side of the described compound layer that only shakes is provided with acoustical cotton layer；The described compound layer that only shakes is close to described internal semi-solid layer, and described acoustical cotton layer is close to the described compound layer that only shakes.

Bone conduction earphone the most according to claim 4, it is characterised in that the described compound layer that only shakes includes the first outside semimetal layer, the first outside semi-solid layer, the second outside semimetal layer, the second outside semi-solid layer and acoustical cotton layer；Described acoustical cotton layer is rubber and plastic material, uses the design of bubble closed pore；The material of described semi-solid layer is butyl rubber, natural rubber, butadiene-styrene rubber, butadiene rubber, neoprene, isoprene rubber, nitrile rubber, EP rubbers or hydrogenation nitrile rubber；Described semimetal layer is aluminium foil or Copper Foil.

Bone conduction earphone the most according to claim 4, it is characterised in that: bone conduction earphone carries out self-adaptative adjustment to the position of described bone conduction vibrator so that it is vibrate at temporal bone before ear, or auricle vibration outside.

Bone conduction earphone the most according to claim 1, it is characterised in that: the framework of described bone conduction earphone is 3D gull wing type framework.

Bone conduction earphone the most according to claim 1, it is characterized in that: described bone conduction earphone has skin sensor and microprocessor at contact skin area, when user by bone conduction earphone from the beginning on take off time, described skin sensor senses the change of contact skin situation thus suspends the broadcasting of current audio signals, and makes whole bone conduction earphone enter low-power consumption duty by described microprocessor；When described earphone is put on by user again, described skin sensor senses the change of contact skin situation thus continues the broadcasting of current audio signals, by described microprocessor recovery global function pattern.

Bone conduction earphone the most according to claim 1, it is characterized in that: described bone conduction earphone also includes radio communication and audio coding decoding unit, described radio communication uses bluetooth, WLAN WLAN, purple honeybee Zigbee standard, one or more in LoPAN；Described radio communication and audio coding decoding unit include at least one wireless antenna, audio codec, baseband digital signal processor DSP, microprocessor unit MCU and memory cell.

10. one kind based on the audio playing apparatus of bone conduction earphone described in any one of claim 1-9, it is characterized in that: described audio playing apparatus is the wired connection mode omitting battery, including bone conduction earphone body, acoustical cotton layer, sponges cover, leakage sound buffer, at least 1 gas conduction microphone, at least 1 bone-conduction microphone, bone conduction drive-by-wire device mainboard, USB power supply interface, audio interface；Inside wherein said headset body, described bone conduction vibrator is fixed at two ends, and two described bone conduction vibrator are connected to described bone conduction drive-by-wire device mainboard by left and right acoustic channels tone frequency channel wire；It is provided with bone conduction driving amplifier, volume control button and at least 1 gas conduction microphone on described bone conduction drive-by-wire device mainboard；The audio input port of described bone conduction drive-by-wire device mainboard connects a tone frequency channel wire, described tone frequency channel wire end is Universal audio interface, the described USB supply port of described bone conduction drive-by-wire device mainboard connects a USB line, and the end of described USB line is a Universal USB adapter.

11. audio playing apparatus according to claim 10, it is characterized in that: described audio interface is 3.5mm audio connector male, described USB supply port is general USBTypeA type male, and described USBTypeA type Male head connector is connected by USBOTG transducer.