CN201222804Y - Earphone for bone conduction apparatus - Google Patents
Earphone for bone conduction apparatus Download PDFInfo
- Publication number
- CN201222804Y CN201222804Y CNU2008201280512U CN200820128051U CN201222804Y CN 201222804 Y CN201222804 Y CN 201222804Y CN U2008201280512 U CNU2008201280512 U CN U2008201280512U CN 200820128051 U CN200820128051 U CN 200820128051U CN 201222804 Y CN201222804 Y CN 201222804Y
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- conduction device
- amplifier
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Abstract
The utility model relates to an improved earphone for a bone conduction device, which comprises a shell and power supply which is connected with the shell, wherein the inner portion of the shell is equipped with a microphone, an amplifier and an oscillator, and further equipped with a frequency-shift phase shifter, an echo canceller and a matcher. The inner portion of the matcher is equipped with an acoustical-electrical transducer, the inner portion of the frequency-shift phase shifter is equipped with a frequency synthesizer, and the frequency synthesizer substantially comprises a phase accumulation module and a waveform storage module. The volume of the microphone is 5 mm3, the response frequency is 5Hz-40000Hz, and the microphone is connected with the frequency-shift phase shifter, the echo canceller, the amplifier and the matcher. The improved earphone for the bone conduction device has simple and reasonable design structure, sound is conducted through bone medium, thereby preventing people from producing feeling of fatigue, also preventing the hearing of a user, being capable of eliminating the function of external noise interference, being capable of receiving the speech information of surrounding environment, and providing a novel speech receiving mode for hearing loss.
Description
Technical field
The utility model relates to a kind of earphone, especially a kind of improvement type earphone that is used for bone-conduction device.
Background technology
At present, the time that common headphones is on the market worn has been grown and can make the people produce sense of fatigue, severe patient also can cause hearing to descend, the harm user's is healthy, and in noisy environment, use, because The noise, the signal that communication counterpart transmits all can be subjected to interference of noise with the signal of passing to communication counterpart, thereby is difficult to reach audiovisual result of use preferably.
In addition, the earphone of osteoacusis mode is existing at present to be used though adopt, and as hearing aids, earphone, mobile portable phone etc., just changing audio signal into a kind of vibration frequency is delivered to ear bones for it, reaches the purpose of obtaining sound, thereby function ratio is more single.In addition, because existing osteoacusis formula earphone project organization complexity, intraware is more, also is unfavorable for daily maintenance and cleaning.
The utility model content
The purpose of this utility model provides a kind of project organization advantages of simple, can effectively eliminate ambient noise disturbs, the infringement of avoiding the air transmitted mode to bring to ear-drum, and can receive a kind of a kind of improvement type earphone that is used for bone-conduction device of bone-conduction device of the voice messaging of surrounding enviroment.
For achieving the above object, the utility model provides a kind of improvement type earphone that is used for bone-conduction device, comprise housing and the power supply that is connected with described housing, described enclosure interior is provided with microphone, amplifier and oscillator, and described enclosure interior also is provided with shift frequency phase shifter, Echo Canceller and adaptation.
The inside of described shift frequency phase shifter is provided with frequency synthesizer.
Described frequency synthesizer comprises and is used for the FREQUENCY CONTROL character is carried out phase-accumulated module, phase place addition module, waveform memory module, digital multiplication module, D/A converter module and the low-pass filtering module that linearity adds up.
Described adaptation inside also is provided with the acoustical-electrical transducer that is used for low voltage signal is converted to voice signal.
The volume of described microphone is 5 cubic millimeters, and response frequency is 5Hz-40000Hz, and is connected with described shift frequency phase shifter, described Echo Canceller, described amplifier, described oscillator and described adaptation.
Described oscillator is made of crystal oscillator and voltage controlled oscillator.
Described amplifier comprises pre-amplifying module, power amplifier module, prime amplifier, frequency shifter and phase detection unit.
Described phase-accumulated module also is connected with the signal referrer module respectively with described D/A converter module.
Also be provided with power splitter between described crystal oscillator and the described voltage controlled oscillator.
Compared with prior art, the utlity model has following advantage:
The improvement type earphone that is used for bone-conduction device of the present utility model comprises housing and connected power supply, and enclosure interior not only is provided with microphone, amplifier and oscillator, also is provided with shift frequency phase shifter, Echo Canceller and adaptation.This adaptation inside is provided with acoustical-electrical transducer; The inside of shift frequency phase shifter is provided with frequency synthesizer, and frequency synthesizer mainly is made of phase-accumulated module and waveform memory module.The volume of microphone is 5 cubic millimeters, and response frequency is 5Hz-40000Hz, and is connected with shift frequency phase shifter, Echo Canceller, amplifier, oscillator and adaptation.The utility model project organization advantages of simple, wear conveniently, safe in utilization; conduct sound by the bone medium; avoid making the people to produce sense of fatigue; also protect user's hearing; and can effectively eliminate the ambient noise interference function; solved the drawback that when using air transmitted receiving system user can't receive the surrounding enviroment voice messaging simultaneously, can also receive the voice messaging of surrounding enviroment, for the Deaf and Hard of Hearing Talents provides a kind of brand-new voice receive mode.
Description of drawings
Fig. 1 is the utility model overall structure block diagram;
Fig. 2 is that the utility model frequency synthesizer is connected block diagram with the signal referrer module;
Fig. 3 is the utility model frequency measured drawing;
Fig. 4 is the utility model vibrating device and amplifier syndeton block diagram.
Embodiment
Fig. 1 is the utility model overall structure block diagram, the utility model provides electric energy by connected power supply for the parts of its inside, its intraware comprises microphone, shift frequency phase shifter, Echo Canceller, amplifier, oscillator and adaptation, and oscillator is connected with microphone with amplifier, shift frequency phase shifter, adaptation, Echo Canceller successively.This oscillator is made of crystal oscillator and voltage controlled oscillator, also is provided with power splitter between crystal oscillator and the voltage controlled oscillator; Amplifier comprises pre-amplifying module, power amplifier module, frequency shifter and phase detection module; The phase shift range of shift frequency phase shifter is 0-2 π, the phase shift step value less than and equal 0.1 °, the frequency inverted time less than and equal 1 μ s, spuious value greater than and equal 75dB.Shift frequency phase shifter inside also is provided with frequency synthesizer, and frequency synthesizer comprises and is used for the FREQUENCY CONTROL character is carried out phase-accumulated module, phase place addition module, waveform memory module, digital multiplication module, D/A converter module and the low-pass filtering module that linearity adds up.The inside of adaptation is provided with acoustical-electrical transducer, the high voltage signal that adaptation is used for is converted to low voltage signal, low voltage signal is imported in its inner acoustical-electrical transducer then, and this acoustical-electrical transducer is used for low voltage signal is converted to voice signal, will transfer to echo removal device inside then.Acoustic echo canceller is that the correlation to loudspeaker signal and the multipath echo that is produced by its is the basis, set up the speech model of remote signaling, utilize it that echo is estimated, and constantly revise the coefficient of filter, make estimated value approach real echo more.Then, the echo estimated value is deducted from the input signal of microphone, thereby reach the purpose of eliminating echo.Acoustic echo canceller is also compared the input of microphone with the value in loud speaker past, prolong the repeatedly acoustic echo of reflection that postpones thereby eliminate.What of the loud speaker output valve in the past that root a tree name memory is deposited, acoustic echo canceller can be eliminated the echo of various delays; This microphone utilizes the silicon manufacturing process at first to etch an extremely small poroid space under silicon face, and covering a layer thickness then thereon only is the film of 500 nanometers.When sound wave reaches in the hole, this layer film on its surface will vibrate and produce electronic signal.This signal just can reach the recording of microphone and the effect that amplifies after further handling via processes such as other electronic devices.The profile of this microphone is traditional shaped like chips, and response frequency is 5Hz-40000Hz, and its volume only is about 5 cubic millimeters, is about 1/10th of present common mini microphone.
Fig. 2 is that the utility model frequency synthesizer is connected block diagram with the signal referrer module.Frequency synthesizer comprises and is used for the FREQUENCY CONTROL character is carried out phase-accumulated module, phase place addition module, waveform memory module, digital multiplication module, D/A converter module and the low-pass filtering module that linearity adds up that phase-accumulated module also is connected with the signal referrer module respectively with described D/A converter module.Wherein, reference signal unit is a high stability crystal oscillator, and its output signal is used to provide the synchronous working of the various parts of DDS frequency synthesizer; Phase accumulator is the core of DDS frequency synthesizer, and it is made up of binary adder and the N bit register by clock fc sampling of a N position word length, and effect is frequency control word K to be carried out linearity add up; What stored in the wave memorizer is a function waveform question blank, the corresponding different different amplitude codings of phase place address output.When phase control words is 0, the amplitude control word is 1 o'clock, and the phase sequence of phase accumulator output obtains the amplitude coding of series of discrete to the wave memorizer addressing.This amplitude coding obtains corresponding staircase waveform after D/A conversion, after low pass filter can obtain required analog waveform after level and smooth.If the phase accumulator word length is N, then DDS frequency synthesizer output frequency fo and frequency resolution Δ fmin are:
By changing the phase parameter that phase control words P can control output signal, the word length that makes the phase place adder is M, when phase control words jumps to P (P ≠ 0) by 0, the output that is input as phase accumulator of wave memorizer and phase control words P sum, thereby the amplitude coding phase place of its output can increase by 2 π p/2M, makes the analogue signal generating phase shift of last output.The phase shift minimum step depends primarily on the word length of phase place adder, and phase shift resolution then depends on the word length N of phase accumulator, shown in following two formula:
The amplitude of DDS frequency synthesizer output signal can realize that amplitude control word A plays the effect that the output amplitude of wave memorizer is encoded and is weighted by insert a digital multiplier after wave memorizer.
By above analysis as can be known, after the phase accumulator word length of DDS frequency synthesizer and phase place adder word length are fixing, by changing frequency, phase place and the amplitude that K, P, A can control DDS frequency synthesizer output analog signal effectively.
Fig. 3 is the utility model frequency measured drawing.As shown in Figure 3, the DDS frequency synthesizer is the open cycle system of a digital structure, no feedback element, so its speed is exceedingly fast, generally all in the nanosecond magnitude.
Because digital structure, the critical defect that causes the DDS frequency synthesizer is that clutter is widely distributed, in falling into output band, and then can't filtering.Spuious mainly is due to the factors such as the amplitude quantizing error brought of the non-ideal characteristic owing to digital device, Phase Truncation Error.
Its main clutter component is followed the Nyquist sampling theorem, and clutter component appears at combination place of reference frequency and output frequency, that is:
Nfc ± fo (n=0, ± 1, ± 2 ...) locate.
Signal at the fo place is the strongest, is fc-fo apart from the nearest clutter component of output frequency.
It on the DDS frequency synthesizer principle frequency divider, therefore the phase noise of DDS output signal is better than clock signal in theory, but because restriction and some other unpredictable factor of the noise floor of digital device own, thereby all too late clock signal of making an uproar mutually of DDS frequency synthesizer output signal.
Fig. 4 the utility model vibrating device and amplifier syndeton block diagram, this oscillator is made of crystal oscillator and two voltage-controlled vibrators, also is provided with power splitter between crystal oscillator and two voltage controlled oscillators.This amplifier is made of two pre-amplifying modules and power amplifier module respectively, and two power amplifier modules are connected with the phase detection module respectively by circuit, and this phase detection module is connected with two frequency shifters and one of them voltage controlled oscillator respectively.
The inner double integrator electronic circuit that adopts of this amplifier is different from traditional principle of lowpass filter.So-called integrating circuit is to be serially connected in the electronic circuit that a capacitor in the feedback control loop and an operational amplifier etc. constitute by one, be used for hindering this integrator to the operational amplifier direct current electroacoustic imbalance of crossing low-frequency integration and causing and cause overload with the capacitor parallel resistor, this channel frequency is responded the slope rising with the reduction of frequency, and octave frequency response of the every reduction of frequency is then risen with the slope of 6dB.
More than disclosed only be several specific embodiment of the present utility model, still, the utility model is not limited thereto, any those skilled in the art can think variation all should fall into protection range of the present utility model.
Claims (9)
1, a kind of improvement type earphone that is used for bone-conduction device, comprise housing and the power supply that is connected with described housing, described enclosure interior is provided with microphone, amplifier and oscillator, it is characterized in that, described enclosure interior also is provided with shift frequency phase shifter, Echo Canceller and adaptation.
2, the improvement type earphone that is used for bone-conduction device as claimed in claim 1 is characterized in that the inside of described shift frequency phase shifter is provided with frequency synthesizer.
3, the improvement type earphone that is used for bone-conduction device as claimed in claim 2, it is characterized in that described frequency synthesizer comprises and is used for the FREQUENCY CONTROL character is carried out phase-accumulated module, phase place addition module, waveform memory module, digital multiplication module, D/A converter module and the low-pass filtering module that linearity adds up.
4, the improvement type earphone that is used for bone-conduction device as claimed in claim 1 is characterized in that, described adaptation inside also is provided with the acoustical-electrical transducer that is used for low voltage signal is converted to voice signal.
5, the improvement type earphone that is used for bone-conduction device as claimed in claim 1, it is characterized in that, the volume of described microphone is 5 cubic millimeters, response frequency is 5Hz-40000Hz, and is connected with described shift frequency phase shifter, described Echo Canceller, described amplifier, described oscillator and described adaptation.
6, the improvement type earphone that is used for bone-conduction device as claimed in claim 1 is characterized in that described oscillator is made of crystal oscillator and voltage controlled oscillator.
7, the improvement type earphone that is used for bone-conduction device as claimed in claim 1 is characterized in that, described amplifier comprises pre-amplifying module, power amplifier module, prime amplifier, frequency shifter and phase detection unit.
8, the improvement type earphone that is used for bone-conduction device as claimed in claim 3 is characterized in that, described phase-accumulated module also is connected with the signal referrer module respectively with described D/A converter module.
9, the improvement type earphone that is used for bone-conduction device as claimed in claim 6 is characterized in that, also is provided with power splitter between described crystal oscillator and the described voltage controlled oscillator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201280512U CN201222804Y (en) | 2008-07-15 | 2008-07-15 | Earphone for bone conduction apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201280512U CN201222804Y (en) | 2008-07-15 | 2008-07-15 | Earphone for bone conduction apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201222804Y true CN201222804Y (en) | 2009-04-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201280512U Expired - Fee Related CN201222804Y (en) | 2008-07-15 | 2008-07-15 | Earphone for bone conduction apparatus |
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| CN (1) | CN201222804Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104396275A (en) * | 2012-03-29 | 2015-03-04 | 海宝拉株式会社 | Wired and wireless earset using ear-insertion-type microphone |
| CN106851485A (en) * | 2017-03-30 | 2017-06-13 | 上海与德科技有限公司 | Component collocation method, device, head circuit and terminal device |
| CN113411724A (en) * | 2021-05-07 | 2021-09-17 | 佳禾智能科技股份有限公司 | Bone conduction earphone communication-based echo cancellation method, computer program medium and bone conduction earphone |
-
2008
- 2008-07-15 CN CNU2008201280512U patent/CN201222804Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104396275A (en) * | 2012-03-29 | 2015-03-04 | 海宝拉株式会社 | Wired and wireless earset using ear-insertion-type microphone |
| CN104396275B (en) * | 2012-03-29 | 2017-09-29 | 海宝拉株式会社 | Use the wire and wireless earphone of insert type microphone in ear |
| CN106851485A (en) * | 2017-03-30 | 2017-06-13 | 上海与德科技有限公司 | Component collocation method, device, head circuit and terminal device |
| CN113411724A (en) * | 2021-05-07 | 2021-09-17 | 佳禾智能科技股份有限公司 | Bone conduction earphone communication-based echo cancellation method, computer program medium and bone conduction earphone |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090415 Termination date: 20150715 |
|
| EXPY | Termination of patent right or utility model |