CN204559838U - Low-power consumption is without internal battery noise cancelling headphone - Google Patents
Low-power consumption is without internal battery noise cancelling headphone Download PDFInfo
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- CN204559838U CN204559838U CN201520176728.XU CN201520176728U CN204559838U CN 204559838 U CN204559838 U CN 204559838U CN 201520176728 U CN201520176728 U CN 201520176728U CN 204559838 U CN204559838 U CN 204559838U
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Abstract
The utility model relates to a kind of low-power consumption without internal battery noise cancelling headphone, and this earphone comprises input plug, loud speaker and is connected to active noise reduction unit therebetween; Described input plug is USB interface, and the data pin of USB interface is connected to the signalling channel of active noise reduction unit through data processing unit, and the supply pin of USB interface is connected with the feeder ear of active noise reduction unit and data processing unit; Described active noise reduction unit comprises noise channel, signalling channel and is connected to the mixer circuit of output of described two passages, the by-pass switch that described mixer circuit is made up of two separate low pressure drop diodes, the positive pole correspondence of described two diodes connects the output of described two passages, and negative pole correspondence connects two terminals of loud speaker.This noise cancelling headphone has the features such as control section volume is little, and complete machine is lightweight, and power consumption is little, and sustainable service time is long.
Description
Technical field
The utility model relates to noise cancelling headphone, more particularly, relates to a kind of low-power consumption without internal battery noise cancelling headphone.
Background technology
Existing earphone, regardless of wear-type or In-Ear, as long as possess active noise reduction function, all must carry supplying cell, namely need in earphone to arrange battery, will increase volume and the complete machine weight of earphone control section like this.
On the other hand, for Portable mobile electronic equipment, due to volume and weight, power supply is all very little.The battery of active noise reduction earphone is no more than 20mA, and therefore power consumption is a large problem.Existing this kind of earphone lowest power consumption average out to 12mA, lasting service time is no more than 2 hours, is therefore necessary very much to improve.
Utility model content
The purpose of this utility model is to provide a kind of low-power consumption without internal battery noise cancelling headphone, large to solve existing active noise reduction earphone volume and weight, and the technical problem that power consumption large, sustainable service time is short.
Concrete technical scheme of the present utility model is as follows:
A kind of low-power consumption, without internal battery noise cancelling headphone, comprises input plug, loud speaker and is connected to active noise reduction unit therebetween; Described input plug is USB interface, and the data pin of USB interface is connected to the signalling channel of active noise reduction unit through data processing unit, and the supply pin of USB interface is connected with the feeder ear of active noise reduction unit and data processing unit; Described active noise reduction unit comprises noise channel, signalling channel and is connected to the mixer circuit of output of described two passages, the by-pass switch that described mixer circuit is made up of two separate low pressure drop diodes, the positive pole correspondence of described two diodes connects the output of described two passages, and negative pole correspondence connects two terminals of loud speaker.
During use, the USB interface of earphone is connected with audiogenic device.On the one hand, audiogenic device passes through the supply pin of USB interface to the circuit supply in earphone, realizes audiogenic device and powers to earphone.On the other hand, usb audio data to be transferred to the data processing unit in earphone by audiogenic device by the data pin of USB interface, restore audio signal, then export an input of by-pass switch (i.e. mixer circuit) through the signalling channel of active noise reduction unit to; Simultaneously, noise channel gathers ambient noise, generate another input that the inverse noise signal corresponding to ambient noise exports by-pass switch to after treatment, by-pass switch exports same loud speaker to after being mixed by two-way input signal, the sound wave containing inverse noise is produced in ear chamber, inverse noise wherein offsets with the ambient noise imported in ear chamber from environment, thus realizes noise reduction.
In above-mentioned low-power consumption without in internal battery noise cancelling headphone, in order to reduce the impact of audio signal further and realize better noise reduction, preferably, the tube voltage drop of described two diodes is all less than 0.1V.
In above-mentioned low-power consumption without in internal battery noise cancelling headphone, postpone to reduce and reduce power consumption further, preferably, described noise channel comprises Noise Acquisition device and the analog filter that connects in turn from this Noise Acquisition device and adaptive digital filter.
In above-mentioned low-power consumption without in internal battery noise cancelling headphone, preferably, described analog filter is a kind of low pass filter with amplification and inversed module.
In above-mentioned low-power consumption without in internal battery noise cancelling headphone, preferably, described adaptive digital filter comprises trap module.
In above-mentioned low-power consumption without in internal battery noise cancelling headphone, in order to obtain better noise reduction, preferably, the acoustic feature of described loud speaker and the feature of described noise processed passage match.
Above-mentioned low-power consumption can be In-Ear Headphones without internal battery noise cancelling headphone, also can be headphone.
The utility model noise cancelling headphone has following beneficial effect:
It provides electric energy by audiogenic device, without the need to arranging battery in earphone, not only effectively reduce volume and the complete machine weight of earphone control section, and to continue service time longer due to the power supply of audiogenic device, therefore also efficiently solve short technical problem existing active noise reduction earphone sustainable service time.
Owing to adopting above-mentioned by-pass switch to carry out audio mixing, considerably reduce noise reduction power consumption, power consumption number is only 1/10th of traditional noise reduction mode (adopting power amplifier to carry out audio mixing).And the application of the noise channel that analog filter combines with adaptive digital filter, not only decrease time delay, and reduce further power consumption.
Accompanying drawing explanation
Fig. 1 is the circuit block diagrams of some embodiment low-power consumption without internal battery noise cancelling headphone;
Fig. 2 is the circuit diagram of its mixer circuit;
Fig. 3 is the circuit block diagram of its noise channel;
Fig. 4 is the acoustic feature figure of its loud speaker.
Embodiment
Below in conjunction with drawings and Examples, the utility model is further illustrated.These more detailed descriptions are intended to help and understand the utility model, and should not be used to limit the utility model.Content disclosed in the utility model, it will be understood by those skilled in the art that and some or all these specific detail can not be needed to implement the utility model.And in other cases, in order to avoid utility model is created desalination, do not describe well-known circuit, method, operating process etc. in detail.
The utility model is connected with audiogenic device by adopting USB interface to realize earphone on the one hand, to make between audiogenic device and earphone while transmission of audio data, also electric energy being transferred to earphone from audiogenic device is that earphone is powered, thus makes active noise reduction earphone without the need to internal battery; On the other hand by improving active noise reduction unit, especially to the improvement of mixer circuit, make the performances such as the power consumption of earphone more excellent.
See figures.1.and.2, some embodiment low-power consumption comprise without internal battery noise cancelling headphone: input plug 10, loud speaker 40 and the active noise reduction unit 30 be connected to therebetween.
Input plug 10 is USB interface, the data pin (D+ and D-) of USB interface is connected to the signalling channel 32 of active noise reduction unit 30 through data processing unit 20, the supply pin (Vbus with GND) of USB interface is connected with the feeder ear of active noise reduction unit 30 and data processing unit 20.The function of data processing unit 20 comprises the usb audio data convert audio signal from audiogenic device 50 according to usb protocol or USB OTG agreement.
Active noise reduction unit 30 comprises noise channel 31, signalling channel 32 and is connected to the mixer circuit 33 of noise channel 31 and signalling channel 32 output.The by-pass switch that mixer circuit 33 is made up of two separate low pressure drop diodes 331,332, the positive pole correspondence of two diodes 331,332 connects the output of noise channel 31 and signalling channel 32, and negative pole correspondence connects two terminals of loud speaker 40.
During use, the USB interface (input plug 10) of earphone is connected with audiogenic device 50.On the one hand, audiogenic device 50 passes through the supply pin of USB interface to the circuit supply in earphone, realizes audiogenic device 50 pairs of earphones and powers, therefore without the need to arranging battery in earphone.On the other hand, usb audio data to be transferred to the data processing unit 20 in earphone by audiogenic device 50 by the data pin of USB interface, restore audio signal, then export an input of by-pass switch (i.e. mixer circuit 33) through the signalling channel 32 of active noise reduction unit 30 to; Simultaneously, noise channel 31 gathers ambient noise, generate another input that the inverse noise signal corresponding to ambient noise exports by-pass switch (i.e. mixer circuit 33) to after treatment, by-pass switch exports same loud speaker 40 to by after two-way input mixing, the sound wave containing inverse noise is produced in ear chamber, inverse noise wherein offsets with the ambient noise imported in ear chamber from environment, thus realizes noise reduction.
Audiogenic device 50 can be PC (computer), also can be the mobile playback equipment of various band USB OTG (On-The-Go) agreement, as mobile phone, and PAD etc.In other words, above-mentioned low-power consumption can be applicable to PC (computer) without internal battery noise cancelling headphone, also can be applied to the mobile playback equipment of various band USB OTG (On-The-Go) agreement, as mobile phone, and PAD etc.
Existing noise cancelling headphone adopts power amplifier to carry out audio mixing usually, and power consumption is larger.And adopt the by-pass switch of said structure to carry out audio mixing to significantly reduce power consumption, power consumption number is 1/10th of traditional noise reduction mode power consumption.It is worthy of note, the diode forming above-mentioned by-pass switch must be low pressure drop diode, otherwise can affect the quality of audio signal and the effect of noise reduction.The tube voltage drop of diode is preferably less than 0.1V.Further, if do not arrange above-mentioned by-pass switch, inverse noise signal and audio signal are directly mixed at loud speaker 40 place, then the impedance of loud speaker 40 self can make mixing inoperative, namely cannot realize noise reduction.
With reference to Fig. 3, in order to reduce time delay and reduce power consumption further, noise channel 31 comprises Noise Acquisition device 311 and the analog filter 312 that connects in turn from this Noise Acquisition device 311 and adaptive digital filter 313.Namely the process of noise signal adopts the mode that combines with digital filter of analog filter.The feature of analog filter is that speed is fast, but effect is thick, and the feature of digital filter accurately to control, but speed is slow, has time delay.Here analog filter 312 is first adopted to carry out quick extensive process, effective waveform after process carries out Digital Discrete, enters adaptive digital filter 313 and carries out accurate shaping, and add notch technology, the accurately inverted waveform of analogue noise, in the hope of offsetting noise to greatest extent.Noise Acquisition device 311 preferably adopts silicon microphone.
Analog filter 312 preferably adopts the low pass filter with amplification and inversed module.Carry out amplifying with the quick tiny signal that Noise Acquisition device 311 is collected, low-pass filtering and anti-phase.The multiplication factor of analog filter 312, phase place and cut-off frequency choose the reduction degree determined noise, affect the effect of making an uproar the effect of noise reduction and the end further.The multiplication factor of analog filter 312 is preferably set to 3-5 doubly, and phase place change is preferably turns over turnback, and cut-off frequency is preferably set to 4KHz.
Adaptive digital filter 313 preferably includes trap module.Also arrange by the centre frequency to notch algorithm, width and the degree of depth further, with the inverted waveform of analog input noise signal more quickly and accurately.The centre frequency of notch algorithm is preferably set to 3.3KHz, and width is preferably set to 300Hz, and the degree of depth is preferably set to more than 15dB.Digital filter 313 receives the noise signal that analog filter 312 exports, be further processed, comprise and discretization is carried out to noise signal, accurately revise noise waveform, automatic adjustment adaptive rate, comprises the frequency of input noise signal, phase place, frequency change rate and amplitude etc.Analog filter basis processes noise signal in conjunction with digital filter, solves the problem that direct NEURAL DISCHARGE BY DIGITAL FILTER speed is slow, operand is large, the power consumption of chip can be reduced by Fast Convergent.
In order to obtain better noise reduction, the loud speaker that loud speaker 40 adopts the feature of acoustic feature and noise channel 31 to match, has illustrated the acoustic feature of the loud speaker 40 adopted in some embodiments in Fig. 4.
In certain embodiments, noise channel 31 can be selected to open or close.After noise channel 31 is closed, use as common headphones.
From the above, this noise cancelling headphone realizes the connection of earphone and audiogenic device by USB interface, while carrying out voice data transmission by USB interface, can also be powered to earphone by audiogenic device, earphone itself is made not need internal battery, thus the volume of earphone control section can be reduced, and alleviate earphone complete machine weight.And, by the improvement to active noise reduction unit, especially to the improvement of its mixer circuit, considerably reduce noise reduction power consumption.Through experiment, the power consumption of some embodiment noise cancelling headphones is only 1/10th of existing noise cancelling headphone.
Claims (7)
1. low-power consumption is without an internal battery noise cancelling headphone, and the active noise reduction unit (30) comprising input plug (10), loud speaker (40) and be connected to therebetween, is characterized in that:
Described input plug (10) is USB interface, the data pin of USB interface is connected to the signalling channel (32) of active noise reduction unit (30) through data processing unit (20), the supply pin of USB interface is connected with the feeder ear of active noise reduction unit (30) and data processing unit (20);
Described active noise reduction unit comprises noise channel (31), signalling channel (32) and is connected to the mixer circuit (33) of output of described two passages, the by-pass switch that described mixer circuit is made up of two separate low pressure drop diodes (331,332), the positive pole correspondence of described two diodes connects the output of described two passages (31,32), and negative pole correspondence connects two terminals of loud speaker (40).
2. low-power consumption according to claim 1 is without internal battery noise cancelling headphone, it is characterized in that: the tube voltage drop of described two diodes is all less than 0.1V.
3. low-power consumption according to claim 1 is without internal battery noise cancelling headphone, it is characterized in that: described noise channel (31) comprises Noise Acquisition device (311) and the analog filter (312) that connects in turn from this Noise Acquisition device and adaptive digital filter (313).
4. low-power consumption according to claim 3 is without internal battery noise cancelling headphone, it is characterized in that: described analog filter is a kind of low pass filter with amplification and inversed module.
5. low-power consumption according to claim 3 is without internal battery noise cancelling headphone, it is characterized in that: described adaptive digital filter comprises trap module.
6. low-power consumption according to claim 1 is without internal battery noise cancelling headphone, it is characterized in that: the acoustic feature of described loud speaker and the feature of described noise channel match.
7. low-power consumption according to claim 1 is without internal battery noise cancelling headphone, it is characterized in that: described earphone is In-Ear Headphones or headphone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520176728.XU CN204559838U (en) | 2015-03-26 | 2015-03-26 | Low-power consumption is without internal battery noise cancelling headphone |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520176728.XU CN204559838U (en) | 2015-03-26 | 2015-03-26 | Low-power consumption is without internal battery noise cancelling headphone |
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| Publication Number | Publication Date |
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| CN204559838U true CN204559838U (en) | 2015-08-12 |
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| CN201520176728.XU Active CN204559838U (en) | 2015-03-26 | 2015-03-26 | Low-power consumption is without internal battery noise cancelling headphone |
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Effective date of registration: 20171219 Address after: 518000 Guangdong city of Shenzhen province Nanshan District Nantou street, No. 11018 Shennan Avenue, grand view building 12-H Patentee after: SHENZHEN JIUXIAO HUANPEI TECHNOLOGY Co.,Ltd. Address before: 512600 Weng Cheng Industrial Park, Wengyuan Guandu economic development test area, Shaoguan, Guangdong Patentee before: GOLDEN SHINE ELECTRONICS (WENGYUAN) CO.,LTD. |
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Effective date of registration: 20220928 Address after: Room 101, No. 16, Lianhua Road, Villa District, Golf Club, Xinsha Community, Shatou Street, Futian District, Shenzhen, Guangdong 518000 Patentee after: Shenzhen Liananda Technology Co.,Ltd. Address before: 12-h, xinhaofang building, 11018 Shennan Avenue, Nantou street, Nanshan District, Shenzhen, Guangdong 518000 Patentee before: SHENZHEN JIUXIAO HUANPEI TECHNOLOGY Co.,Ltd. |
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Effective date of registration: 20240123 Address after: 518000 Shennan Garden 302H, No. 11 Kexing Road, Science and Technology Park Community, Yuehai Street, Nanshan District, Shenzhen, Guangdong Province Patentee after: Shenzhen Jingyu Hongtu Technology Co.,Ltd. Country or region after: China Address before: Room 101, No. 16, Lianhua Road, Villa District, Golf Club, Xinsha Community, Shatou Street, Futian District, Shenzhen, Guangdong 518000 Patentee before: Shenzhen Liananda Technology Co.,Ltd. Country or region before: China |