CN101583064A - Micro audio directional loudspeaker with three dimension soundeffect - Google Patents
Micro audio directional loudspeaker with three dimension soundeffect Download PDFInfo
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- CN101583064A CN101583064A CNA200910059776XA CN200910059776A CN101583064A CN 101583064 A CN101583064 A CN 101583064A CN A200910059776X A CNA200910059776X A CN A200910059776XA CN 200910059776 A CN200910059776 A CN 200910059776A CN 101583064 A CN101583064 A CN 101583064A
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Abstract
The invention relates to a micro audio directional loudspeaker with three dimension soundeffect, belonging to the technical field of electronic, in particular to the technical field of loudspeaker. The micro audio directional loudspeaker with three dimension soundeffect comprises a digital signal processing part, a power amplification part and a micro ultrasonic transducer part; wherein, in the signal processing unit, the input audio signal is firstly convolved with head related transfer function (HRTF), loaded into ultrasound through amplitude modulation, and amplified by the power amplifier; the processed ultrasound is output by MEMS transducer. Due to air nonlinear interaction, the output ultrasound signal generates audible sound with high directivity and lifelike and virtual three dimension soundeffect by self-modulating. The loudspeakers can be widely used in various portable multimedia mobile equipments, which can bring listeners an immersed sense and has no interference to peripheral environment due to directivity thereof.
Description
Technical field
Have the micro audio directional loud speaker of 3-D audio, belong to electronic technology field, particularly the loud speaker field.
Background technology
Existing audio directional loudspeaker, it is a kind of directly pretreated hyperacoustic sound radiating devices of radiation process in air, its cardinal principle is to utilize the characteristics of hyperacoustic high directivity, audio signal is modulated on the ultrasonic wave of fixed frequency, launches in air by ultrasonic transducer through amplifying the back.According to Berktay Far field solution theory, the ultrasonic signal after the modulation is because air non-linear from the demodulation effect demodulates the audible sound of high directivity, and the second time derivative of the audible sound amplitude that demodulates and modulation signal envelope square is directly proportional.The audible sound that is produced by this technology has very strong directive property, have application promise in clinical practice, but owing to from the audible sound sound level fuzzy that demodulates, lack third dimension, can not bring desirable pleasure of the senses to the hearer, thereby its scope of application there is certain limitation.
Another technology, the existing three-dimensional sense of hearing based on conventional loudspeakers realizes technology, can produce 3-D audio true to nature, brings brand-new hearing enjoying to the hearer.The three-dimensional sense of hearing realizes mainly being based on acoustics, auditory physiology is learned, the technology that auditory psychology is learned.Its cardinal principle is: at first, because external sound arrives the intensity difference of left and right sides ear drum membrane and the time difference that sound wave arrives left and right sides ear drum membrane, can bring the judgement of hearer to sound source position, distance.Secondly, the special shape of human outer auricle has been also to having produced natural filtering, mixer action to intelligent's ear drum membrane acoustic signals before, can make the hearer produce judgement to acoustic environments.According to above-mentioned principle, the three-dimensional sense of hearing based on conventional loudspeakers realizes that Technology Need accurately writes down the frequency response of the sound of each orientation, varying strength, different frequency in the generation of people's ear drum membrane place, make up complete database, be commonly called and a correlation function.The committed step that this technology realizes is to make itself and a correlation function carry out convolution algorithm before sound signal outputs to loud speaker, make the information that comprises sound source position, distance and acoustic environments in the sound signal, thereby make the hearer experience the effect of the three-dimensional sense of hearing on the spot in person.
The present invention, the micro audio directional loud speaker that promptly has 3-D audio then is a kind of brand-new loud speaker, the total characteristics of audio frequency directional propagation have been merged with the three-dimensional sound effect, can be when producing the high directivity audible sound, bring three-dimensional auditory effect true to nature to the hearer, have application prospects.
Summary of the invention
Micro audio directional loud speaker with 3-D audio is a kind ofly can realize voice directional spreading, can produce the New-type loudspeaker of virtual three-dimensional audio again.It satisfy the hearer to audio oriented propagation needs in, also satisfied the demand of hearer to more high-quality audio.In addition, make the miniature ultrasonic transducer owing to adopt MEMS (micro electro mechanical system) (MEMS) technology, make the present invention have small volume, low in power consumption, can be widely used in all kinds of portable mobile multimedia equipment, for example mobile phone, handheld device, palmtop PC etc.
Micro audio directional loud speaker with 3-D audio mainly is made up of following components: low pass filter group unit, AD conversion unit, signal processing unit, number is touched converting unit, band-pass filter unit, power amplification unit, and the ultrasound transducer array unit that adopts micro electro mechanical system (MEMS) technology to make.Wherein signal processing unit is the core, and it comprises a 3-D audio Preprocessing Algorithm module and a ultrasonic amplitude modulation(PAM) module.Below respectively each component units is elaborated:
Low pass filter group unit: can be built by hardware circuit, the audio signal of input is carried out Filtering Processing, filter away high frequency noise only keeps 20Hz～20kHz with interior audio signal
AD conversion unit: adopt high accuracy, high-speed a/d chip, the simulated audio signal of input is carried out analog-to-digital conversion (if direct input digit audio frequency, can with this unit bypass)
Signal processing unit: this unit comprises two main modular.First module will be carried out convolution with a corresponding left and right sides ear and a correlation function (HRTF) respectively through the left and right acoustic channels digital audio and video signals after the AD conversion, make signal after the convolution when carrying the ordinary audio signal message, comprise the relevant information of position, distance and the auditory space of sound source, finish the 3-D audio preliminary treatment; Second module will be finished the pretreated audio signal of 3-D audio and be modulated on the ultrasonic wave that frequency is 30kHz～70kHz.
D/A conversion unit: the output digital signal of signal processing unit is carried out the D/A conversion.Owing to carry out a large amount of real time signal processings at signal processing unit,, adopt high accuracy, high-speed d/a chip in order to guarantee the low distortion of back level output audio signal.If the back level adopts digital power amplifier, then this unit can carry out the bypass processing.
Band pass filter group unit: the available hardware circuit realizes, as centre frequency, keeps the frequency content in the 20kHz bandwidth, all kinds of clutter noises of filtering with the ultrasonic signal that adopted in the signal processing unit
Power amplification unit: to carrying out processing and amplifying, to drive the miniature ultrasonic transducer unit of back level through the filtered output signal of band pass filter group.The power amplifier type can be analog power amplifier, as category-A, category-B, AB class etc., also can be the numeric class power amplifier, as D class, E class, T class etc.
The miniature ultrasonic transducer unit: the miniature transducer array that adopts MEMS (micro electro mechanical system) (MEMS) technology to make, the shape of each unit can be circular, square, strip, ring-like, polygon etc., number can not waited to hundreds of is individual by several.The form of miniature ultrasonic transducer array can be circular, square, strip, ring-like, polygon etc.
The present invention adopts way of hardware and software combination, provides a cover total solution for realizing the audio directional loudspeaker with 3-D audio.The present invention can not only realize the high directivity propagation of audible sound, and can produce three-dimensional audio true to nature.Behind the miniature transducer that has adopted micro electro mechanical system (MEMS) technology to make, can be widely used in all kinds of portable multimedia apparatus, for the hearer provides brand-new auditory perception.
Description of drawings
Fig. 1 has the function signal of the micro audio directional loud speaker of 3-D audio
Fig. 2 has the general structure of the micro audio directional loud speaker of 3-D audio
The realization block diagram of Fig. 3 3-D audio and audio frequency directional function
A kind of miniature transducer array structure of Fig. 4 example
A kind of signal processing example of Fig. 5
Embodiment
Fig. 1 shows the function of the audio directional loudspeaker with 3-D audio.Audio directional loudspeaker 1 with 3-D audio directionally sends through pretreated ultrasonic wave 3 to user 2 left and right sides ear respectively, along with ultrasonic wave takes place in air from the demodulation effect, what finally arrive user's 2 ears is the audible sound with three-dimensional audio, not only realized voice directional spreading, and solved general audio directional loudspeaker tonequality thin, do not have a relief problem.
Fig. 2 is the overall construction drawing with micro audio directional loud speaker of 3-D audio.Micro audio directional loud speaker with 3-D audio is by low pass filter 4, A/D converter 5, and signal processing unit 6, D/A converter 9, band pass filter 10, power amplifier 11, miniature transducer 12 constitutes.Wherein signal processing unit 6 has comprised 3-D audio processing unit 7,8 two parts of ultrasonic modulator.The simulated audio signal of external world's input keeps frequency content in people's ear audible sound scope by low pass filter 4, filters out 20Hz～20KHz noise signal in addition.Signal is converted into digital audio and video signals by A/D converter 5 after the filtering.But the signal processing unit of being made up of 3-D audio processing unit 7 and ultrasonic modulator 86 can be digital signal processor (DSP) on hardware also can be scene editorial logic gate array (FPGA).What digital audio and video signals of in 3-D audio processing unit 7 A/D converter 5 being exported and foundation in advance were good carries out convolution algorithm with a correlation function (HRTF).With a correlation function be through a large amount of experiment tests obtain by each orientation, distance, the frequency response database that the sound source of frequency produces at people's ear drum membrane place.The left and right acoustic channels digital audio and video signals of A/D converter 5 output respectively with the carrying out output signal after the convolution with a correlation function and will carry spatial informations such as orientation about sound source, distance of the left and right sides ear of prior foundation.Finish the modulation to ultrasonic signal in ultrasonic modulator unit 8, subsequently at D/A converter 9, band pass filter 10 is finished digital-to-analogue conversion and filtering noise work respectively.Power amplifier 11 can be selected category-A, category-B, AB class, D class, E class, H class etc. on hardware, reach the purpose that drives Microspeaker.Miniature transducer 12 adopts the manufacturing of MEMS (micro electro mechanical system) (MEMS) technology, has extra small volume and can export required ultrasonic acoustic pressure, enables to embed all kinds of portable mobile multimedia equipment.
Fig. 3 shows 3-D audio and the audio frequency directional function realizes principle, comprises 3-D audio processing unit 7 and ultrasonic modulator 8.Wherein mainly comprised the left and right sides ear that makes up in advance in the 3-D audio processing unit 7 with a correlation function (HRTF) and two multipliers 14.The digital audio and video signals of input on frequency domain respectively with the multiplying each other of left and right sides ear with a correlation function, obtain carrying the digital audio and video signals of the audible sound frequency range of spatial information.Ultrasonic modulator 8 is finished the amplitude modulation(PAM) of pretreated audible sound audio frequency signal to ultrasonic signal.
Fig. 4 shows a kind of array structure example of miniature transducer.Miniature transducer array 12 is made up of 25 transducer units 15, arranges to be the form of the five-element's five row.Strip structure 16 is electrodes of miniature transducer array.
Fig. 5 shows a kind of signal processing example.Show the processing procedure of the digital audio of 6 pairs of A/D converters of signal processing unit, 5 inputs.Wherein before an input digital audio signal and a correlation function (HRTF) are carried out convolution, need the orientation of sound source be rejudged, whether upgrade and a correlation function with decision.When carrying out convolution algorithm in 3-D audio processing unit 7, because the HRTF database comprises a large amount of sound source spatial informations, the convolution algorithm amount is big, needs to use high order FIR filter to be achieved, and needs high performance processor to support on hardware simultaneously.The entire process program is carried out for circulation, just stops calculation process until exiting command.
Claims (10)
1, has the micro audio directional loud speaker of 3-D audio, comprising: low pass filter group unit, AD conversion unit, signal processing unit, number is touched converting unit, band pass filter group unit, power amplification unit, and the ultrasonic transducer unit that adopts micro electro mechanical system (MEMS) technology to make.
2, according to the described micro audio directional loud speaker of claim 1, it is characterized in that signal processing unit comprises the module of two function opposite independent: 3-D audio processing module and ultrasonic modulation module with 3-D audio.
3, according to the described micro audio directional loud speaker of claim 1, it is characterized in that, at first the input audio frequency is carried out the 3-D audio preliminary treatment, finish the convolution algorithm of an input audio signal and a correlation function (HRTF) at signal processing unit with 3-D audio; Finish amplitude modulation(PAM) again to ultrasonic signal.Wherein ultrasonic signal frequencies is 20kHz～100kHz.
4, according to the described micro audio directional loud speaker with 3-D audio of claim 1, it is characterized in that launching hyperacoustic miniature transducer device, quantity is 2-10, and operating frequency is 10kHz～200kHz.
5, according to the described micro audio directional loud speaker of claim 1 with 3-D audio, it is characterized in that transducer is an array architecture, cell configuration can be circular, square, strip, ring-like, arbitrary polygon etc., number of unit is 2-500.
6, according to claim 1 and the described micro audio directional loud speaker of claim 5, it is characterized in that the miniature ultrasonic transducer unit can be arranged in the same plane, also can be arranged in the same curved surface with 3-D audio.
7,, it is characterized in that it can be square planar that the miniature ultrasonic transducer unit is arranged the plane, circular flat, elliptic plane or regular polygon plane according to claim 1 and the described micro audio directional loud speaker of claim 6 with 3-D audio; Arranging curved surface can be sphere curved surface, oval sphere curved surface or other irregular curved surfaces.
8, according to the described micro audio directional loud speaker of claim 1 with 3-D audio, it is characterized in that realizing 360 degree 3-D audio, be ± 15 to spend to the orientation angle of sound source.
9, according to the described micro audio directional loud speaker of claim 1 with 3-D audio, it is characterized in that signal processing unit hardware can be digital signal processor (DSP) but, scene editorial logic gate array (FPGA), single-chip microcomputer (MCU) and CPLD (CPLD) etc.
10, according to the described micro audio directional loud speaker of claim 1 with 3-D audio, it is characterized in that its power amplifier type can be category-A, category-B, AB class, D class, E class, G class, T class and H class etc., operating frequency is 0～2MHz.
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| CNA200910059776XA CN101583064A (en) | 2009-06-26 | 2009-06-26 | Micro audio directional loudspeaker with three dimension soundeffect |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104918175A (en) * | 2015-05-13 | 2015-09-16 | 南京百音高科技有限公司 | Directional sound boxes in multi-unit arc arrangement |
| CN106491081A (en) * | 2016-09-28 | 2017-03-15 | 北京大学 | A kind of Alzheimer disease patient's screening system based on auditory space matching process |
| CN106535060A (en) * | 2015-09-14 | 2017-03-22 | 中国移动通信集团公司 | Pickup control method, audio frequency playing method, and pickup control device |
| CN107420848A (en) * | 2017-08-28 | 2017-12-01 | 深圳传音通讯有限公司 | The method that music lighting lamp and music lighting lamp orientation play music |
| CN107708041A (en) * | 2017-09-02 | 2018-02-16 | 上海朗宴智能科技有限公司 | A kind of audio beam loudspeaker |
| CN108737940A (en) * | 2018-04-24 | 2018-11-02 | 深圳市编际智能科技有限公司 | A kind of high directivity special type loud speaker sound reinforcement system |
| CN109640229A (en) * | 2019-02-22 | 2019-04-16 | 星阅科技(深圳)有限公司 | A kind of method reducing directional loudspeaker noise and the directional loudspeaker for reducing noise |
| CN110138458A (en) * | 2019-06-04 | 2019-08-16 | 南京华格信息技术有限公司 | A kind of sound wave remotely orients pack transmitting implementation method |
| CN110460863A (en) * | 2019-07-15 | 2019-11-15 | 北京字节跳动网络技术有限公司 | Audio/video processing method, device, medium and electronic equipment based on display position |
| CN111654806A (en) * | 2020-05-29 | 2020-09-11 | Oppo广东移动通信有限公司 | Audio playing method and device, storage medium and electronic equipment |
| CN112261563A (en) * | 2020-10-22 | 2021-01-22 | 常州元晶电子科技有限公司 | Mems digital loudspeaker system and working method thereof |
| CN113852892A (en) * | 2021-09-07 | 2021-12-28 | 歌尔科技有限公司 | Audio system and control method and device thereof |
-
2009
- 2009-06-26 CN CNA200910059776XA patent/CN101583064A/en active Pending
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104918175A (en) * | 2015-05-13 | 2015-09-16 | 南京百音高科技有限公司 | Directional sound boxes in multi-unit arc arrangement |
| CN106535060A (en) * | 2015-09-14 | 2017-03-22 | 中国移动通信集团公司 | Pickup control method, audio frequency playing method, and pickup control device |
| CN106535060B (en) * | 2015-09-14 | 2018-08-10 | 中国移动通信集团公司 | A kind of pick-up control method, audio frequency playing method and device |
| CN106491081B (en) * | 2016-09-28 | 2019-12-03 | 北京大学 | It is a kind of based on the sense of hearing-spatial match method Alzheimer's disease patient's screening system |
| CN106491081A (en) * | 2016-09-28 | 2017-03-15 | 北京大学 | A kind of Alzheimer disease patient's screening system based on auditory space matching process |
| CN107420848A (en) * | 2017-08-28 | 2017-12-01 | 深圳传音通讯有限公司 | The method that music lighting lamp and music lighting lamp orientation play music |
| CN107708041A (en) * | 2017-09-02 | 2018-02-16 | 上海朗宴智能科技有限公司 | A kind of audio beam loudspeaker |
| CN108737940A (en) * | 2018-04-24 | 2018-11-02 | 深圳市编际智能科技有限公司 | A kind of high directivity special type loud speaker sound reinforcement system |
| CN108737940B (en) * | 2018-04-24 | 2020-03-27 | 深圳市编际智能科技有限公司 | High-directivity special loudspeaker sound amplification system |
| CN109640229A (en) * | 2019-02-22 | 2019-04-16 | 星阅科技(深圳)有限公司 | A kind of method reducing directional loudspeaker noise and the directional loudspeaker for reducing noise |
| CN110138458A (en) * | 2019-06-04 | 2019-08-16 | 南京华格信息技术有限公司 | A kind of sound wave remotely orients pack transmitting implementation method |
| CN110460863A (en) * | 2019-07-15 | 2019-11-15 | 北京字节跳动网络技术有限公司 | Audio/video processing method, device, medium and electronic equipment based on display position |
| CN111654806A (en) * | 2020-05-29 | 2020-09-11 | Oppo广东移动通信有限公司 | Audio playing method and device, storage medium and electronic equipment |
| CN111654806B (en) * | 2020-05-29 | 2022-01-07 | Oppo广东移动通信有限公司 | Audio playing method and device, storage medium and electronic equipment |
| CN112261563A (en) * | 2020-10-22 | 2021-01-22 | 常州元晶电子科技有限公司 | Mems digital loudspeaker system and working method thereof |
| CN113852892A (en) * | 2021-09-07 | 2021-12-28 | 歌尔科技有限公司 | Audio system and control method and device thereof |
| CN113852892B (en) * | 2021-09-07 | 2023-02-28 | 歌尔科技有限公司 | Audio system and control method and device thereof |
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Application publication date: 20091118 |