CN104703086B - It is a kind of that sound system is oriented from silence based on active demodulation - Google Patents
It is a kind of that sound system is oriented from silence based on active demodulation Download PDFInfo
- Publication number
- CN104703086B CN104703086B CN201510077768.3A CN201510077768A CN104703086B CN 104703086 B CN104703086 B CN 104703086B CN 201510077768 A CN201510077768 A CN 201510077768A CN 104703086 B CN104703086 B CN 104703086B
- Authority
- CN
- China
- Prior art keywords
- sound
- silence
- signal
- active
- demodulation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Abstract
It is described to be constituted from silence orientation sound system by parametric acoustic array, from silence control system, opposite-flushing type sounding panel and active demodulating equipment the invention discloses a kind of based on actively demodulating from silence orientation sound system.The present invention can send the characteristic of direct sound according to parametric loudspeaker, and the sound described in this patent is used in combination from silence and active demodulation techniques, so that it may parametric source is effectively sent the beam of sound of orientation, spacing.
Description
Technical field
It is a kind of that sound system is oriented from silence based on active demodulation, it is related to parametric loudspeaker field, is related specifically to ginseng
Measure sound source and realize orientation, the treating method and apparatus of spacing sounding.
Background technology
Conventional audible loudspeaker has been obtained for being widely applied very much, such as, conventional sound equipment, mobile phone speaker, TV sound
Sound, earphone, meeting-place sound equipment etc. belong to sound-producing device conventional at present, and they are all based on greatly the sounding dress of moving-coil type principle
Put.Such loudspeaker often does equilibrium, filtering, amplification, reverberation, many sound according to the demand of concrete application occasion in internal system
The processing such as road, compression and amplitude limit, is so achieved with the acoustics needed.But based on the acoustic apparatus that conventional acoustic is theoretical
There is a general character, that is, the sound sent is uncontrollable, the sound that it sends is propagated to surrounding space omnidirectional.Much should
Sound can be heard by only wanting to the specific region in a space with occasion, and other regions are kept quite, it is clear that now
Conventional loudspeakers technology and current acoustic apparatus all can't effectively meet this needs.
The direction of propagation of sound is controlled, conventional method there are three kinds at present, the first is in traditional audible device periphery
Plus a poly- sound cover, the realization of this technology is to be based on physical reflection principle, and effect is poor；Second is increase conventional loudspeakers
Size because sound can the size of direction propagation and sound source have direct relation, when wavelength and the sound source size of acoustical signal
When relatively, sound wave can show preferable directionality, audio frequency between 20Hz ~ 20kHz, its wavelength 17mm ~
Between 17m, it is clear that by designing a huge loudspeaker come the method for realizing direction propagation sound be unpractical；The
Three kinds of methods are exactly parametric array technology, and voice signal is modulated on ultrasonic signal, then sent by supersonic changer element, this
The method of sample can realize the direction propagation of sound, refer to the paper delivered by H. O. Berktay and D. J. Leahy
《Farfield performance of parametric transmitters》, but this method may only direction propagation,
The parameter beam of sound propagation distance that acoustic energy compares concentration is distant, therefore it can not fully achieve the space spacing of sound
Propagate.
It is a kind of disclosed in this patent that sound system is oriented from silence based on active demodulation, it can not only realize the strong of sound
Direction propagation, can also effectively control the propagation distance of sound, this technology secret acoustical signal be protected from sound pollution,
Being advantageously applied in terms of sound special efficacy.Apply the technology well in one embodiment of this patent.This is specially
Being set based on active demodulation from silence orientation sound system including Digital Signal Processing, transducer array Column Layout described in profit
Count and actively demodulate module design.
The content of the invention
It is an object of the invention to provide orientation acoustic apparatus and the side that sound is propagated in a kind of use from silent technology setting distance
Method, it makes audience only can just hear sound in the near field of orientation acoustic equipment, this technology can solve directional loudspeaker because
Sound is sudden and violent
Dew and the audio frequency sensitive information leakage that produces and the problems such as noise pollution, can also allow audience to obtain a kind of marvellous
Audio experience.
Another object of the present invention is that there is provided one the problem of audio distortions near field range for orientation acoustic equipment
Planting can promote it, from the active demodulating equipment demodulated, to realize that parametric source can send high identification audible sound near field near field
Purpose.
To realize technology described in invention, sound system is oriented by the following technical programs from silence based on active demodulation
Realize, system is arranged including parametric acoustic array, from silence control module, opposite-flushing type sounding panel, active demodulating equipment.
Parametric acoustic array module be audio signal pass sequentially through pretreatment, PWM, load matched, power amplification, until warp
Later the parametric arrays panel of level sends the audible sound with directive property.
From silence processing system, before digital audio and video signals are modulated, the digital audio and video signals that single channel is inputted turn
The channel signal of identical two is changed to, first passage signal is by carrying out PWM, two-stage Martin Hilb after two-stage Hilbert transform
Spy's conversion can complete 180 ° of phase shift of signal；The signal of second channel is by an adjustable gain module, adjustable gain module
The amplitude difference of two reciprocal channel signals of phase can be controlled, Magnitude Difference is the principal element for determining sound transmission distance；For
Keep with first passage signal synchronously be modulated, here to the audio-frequency information of second channel progress delay process；Prime signal
The sound signal of two passages is modulated on ultrasonic carrier after the completion of processing.
The two paths of signals through ovennodulation as described in patent will carry out load matched with rear class respectively, because load is in appearance
Property, so in order to obtain optimal power output, it is necessary to offset load capacitive reactance with perceptual device.Two-way after load matched
Signal carries out power amplification by D classes power amplification unit.
The characteristic for the energy transducer being laid out on opposite-flushing type sounding panel, panel is completely the same, according on sounding panel
The Electric connection characteristic of the energy transducer of layout is different and it is divided into two classes；First kind energy transducer is connected on by connecting line
On first passage signal output part, Equations of The Second Kind energy transducer is to be connected on by connecting line on second channel signal output part；Two classes
Energy transducer uniform layout on substrate, the beam of sound for the opposite in phase that two class energy transducers of uniform layout are sent is being propagated
During can effectively be offset, the degree that beam of sound is offset can be by sound from the gain control module in silence module
It is controlled.
Active Acoustic demodulation module, is a complicated sound reflecting cavity in fact.The modulated ultrasonic wave that sounding panel is sent
Beam demodulates audible sound during propagation through non-linear interaction, sounding panel near field range from demodulating process not
Fully, so audible sound distortion is more serious.In order that audience can hear clearly voice signal, patent in sounding panel near field
There is provided a kind of Active Acoustic demodulation module, it is modulated ultrasound is propagated foot in a sound reflecting cavity by sound reflecting principle
Enough distance so as to promote sound from demodulating, in fact this be the propagation distance for having exchanged beam of sound for space reflection process.
Present invention firstly provides the directional loudspeaker that achievable spacing is propagated, and disclose a kind of master for parametric source
Dynamic sound demodulation method, this addresses the problem the problem of the far field sound exposure and near field sounds distortion of tradition orientation acoustic equipment.
As two key issues that parametric source is solved from silence sound system based on active demodulation described in this patent, this makes it
Can more have
What is imitated applies in terms of anti-sound interference, sensitive information protection, sound special efficacy, indoor active noise reduction.
Brief description of the drawings
Fig. 1 is the scantling plan that sound system is oriented from silence based on active demodulation.
Fig. 2 is from silence control module workflow diagram.
Fig. 3 is the schematic diagram that opposite-flushing type sounding panel transducer array is laid out one embodiment.
Fig. 4 is the schematic diagram that opposite-flushing type sounding panel transducer array is laid out second embodiment.
Fig. 5 is the schematic diagram that opposite-flushing type sounding panel transducer array is laid out the 3rd embodiment.
Fig. 6 is the structure chart of Active Acoustic demodulation module.
Fig. 7 is the exploded view of Active Acoustic demodulation module.
Fig. 8 is Active Acoustic demodulation module section operating diagram.
Embodiment
It is contemplated that design one has the orientation acoustic equipment of spacing propagation characteristic, and embodiment is entered with reference to accompanying drawing
Detailed description, the embodiment gone simply to illustrate that thus the technical scheme, patent is not restricted including scope.
Fig. 1 shows the scantling plan that sound system is oriented from silence demodulated based on Active Acoustic.It is that sound source 1 enters first
Parametric array sound system 2, sound source 1 provides audio input for whole system and first passes around simulation low-pass filter 3, and human ear is audible
Acoustic frequency scope is that the low-pass cut-off frequencies in 20Hz ~ 20kHz, embodiment designed by LPF are 20kHz.Analog-to-digital conversion list
Member 4 completes the digitlization of sound signal, and the sound signal after digitlization, which enters in digital signal processing platform 5, embodiment, to be selected
FPGA equally can realize such function as core processor using DSP, ARM platform.Signal pre-processing module 6 is to audio
Signal carries out digital filtering and equilibrium treatment, is respectively completed highly-precise filtering and signal compensation function, and then sound signal is changed
Drowned oneself silent control function module for identical two channel signal and entering.As shown in Fig. 2 the signal of first passage passes through two-stage Xi Er
Bert conversion module 8 completes 180 ° of phase shift processing, and the signal of second channel passes sequentially through gain control and delays time to control module
7.The computing of two-stage Hilbert is adjusted than relatively time-consuming in order to ensure two paths of signals can synchronize amplitude to identical sound signal
System, delays time to control has been carried out to second road signal.Gain control is that, in order to which the intensity of sound for adjusting two paths of signals is poor, this is control
The principal element of sound transmission distance.Modulation module 9 completes the PWM of two multichannel audio signals, and PWM includes single here
Carrier modulation and dual carrier modulation, wherein dual carrier modulation refer to the superposition of the ultrasonic signal of two kinds of different frequencies as load
Ripple signal.
Fig. 3 shows one embodiment of opposite-flushing type sounding panel transducer array layout.Opposite-flushing type sounding panel
General principle is the sound signal that two-way opposite in phase is sent by two class energy transducers on panel, and the signal of opposite in phase exists
It can be offset in communication process, thus can be by controlling two multichannel audio signal amplitude differences to reach that control sound signal is propagated
The purpose of distance.One key factor of transducer array Column Layout makes sure that two class energy transducers are uniform on substrate
Property.Device 14 is first kind energy transducer in Fig. 3, and device 15 is can to send second reverse with first kind energy transducer sound
Class energy transducer, two class energy transducer characteristics are completely the same, are to be divided into two classes according to their electrical connection difference here,
This two classes device is uniform in the way of intersecting to be laid out on the substrate 12；It is similar with the device layout shown in Fig. 3, in Fig. 4
One class device 14 and Equations of The Second Kind device 15 be by unit crossed geometry of a line on the surface of substrate 12；Two class devices in Fig. 5
Layout be using 3 energy transducers as a unit, wherein 3 first kind devices composition first kind device cells 14, same 3 the
Two class devices composition Equations of The Second Kind device cell 15, two class device cells are laid out on the substrate 12 in the way of uniform crossover.
Fig. 6 shows the structure chart of Active Acoustic demodulation module.It is by sounding panel 12, reflecting plate 16, reflecting plate 17, outer
Continuant orifice 18 is evenly distributed with the cavity that shell protecgulum 19 and surrounding shell are constituted, reflecting plate, the direction of X-axis shows sound
The propagation axis direction of wave beam.Reflecting plate 16 and reflecting plate 17 have two functions, and one is that beam of sound is reflected, and two be sound wave
Beam can reflected plate continuant orifice outflow.Position of the continuant orifice of two reflecting plates on reflecting plate is different, such design
It ensure that sound can need to just be spread out of by multiple reflection from the continuant orifice of rear class, multiple reflections of the beam of sound in reflection chamber
It is that modulated ultrasound fully completes sound from the key demodulated in a less cavity.Fig. 7 is the knot of Active Acoustic demodulation module
Structure exploded view.The distance between opposite-flushing type sounding panel 12 and reflecting plate 16, reflecting plate 16 and reflecting plate 17 are at 2 millimeters to 30 lis
Between rice.Fig. 8 shows the operating diagram in Active Acoustic demodulation module section, and its cavity is included before 2 reflectings surface and cavity
Lid.One phonation unit of opposite-flushing type sounding panel 12 sends sound wave 20, and sound wave arrives first at the first of Active Acoustic demodulation module
Individual reflecting plate a, part for beam of sound has passed through the sound hole of reflecting plate, and the reflected plate of another part wave beam is reflexed to up to sounding
Secondary reflection again after panel, sound wave incident angle is identical with angle of reflection.Beam of sound in Active Acoustic demodulation module is by multiple interaction
Reflection is eventually sent out of cavity, and the sound letter after fully demodulation thus can be just heard in the near field of Active Acoustic demodulation module
Number.
It should be appreciated that embodiment described in patent is simply to illustrate that the principle application of the technology, various equivalent modifications exist
A variety of equal modifications and replacement can equally be made by understanding after the technical principle and principle, the content of claims be exactly in order to
Cover all such modifications and replacement.
Claims (4)
1. a kind of orient sound system based on active demodulation from silence, system includes：
Parameter array 1 system, for the beam of sound that the directionless audio signal of input is changed into having highly directive；
Be used to control amplitude, the phase information of institute's audio signal modulation from silence control system, with realize beam of sound is propagated away from
From software control；
Opposite-flushing type sounding panel, system sends sound wave by opposite-flushing type energy transducer array designed on sounding panel, with reference to
From the adjustment effect of silence control system, two class energy transducers on sounding panel can be sent with the opposite sound wave of phase information
Beam；
Active Acoustic demodulating equipment, for promoting modulated ultrasound to be realized in a less physics cavity by repeatedly coming and going reflection
Fully demodulation, so as to effectively weaken parametric source near field sounds problem of dtmf distortion DTMF.
2. according to claim 1 orient sound system based on active demodulation from silence, it is characterised in that：It is described from
Silence control system needs single pass sound signal to be converted to the sound signal of two passages；Pass through the signal to first passage
Phase shift computing is carried out, realizes that two channel signal phases have 180 ° of difference；Increase gain by the signal to a passage to control
Module, can be achieved the controllable purpose of two channel amplitudes difference；180 ° of signal phase shift is realized by two-stage Hilbert transform；The
Time loss caused by the Hilbert computing of one passage, two can be realized by the timing_delay estimation module designed by second channel
Channel signal is synchronous；Two channel signals are respectively adopted with the supersonic frequency of identical or different frequency as carrier wave, reference carrier frequency
In 20kHz ~ 300kHz.
3. according to claim 1 orient sound system based on active demodulation from silence, it is characterised in that：Described pair
The energy transducer characteristic rushed on formula sounding panel is completely the same, and the difference according to energy transducer electrical connection is institute on sounding panel
The energy transducer of layout is divided into two classes, and two class energy transducers are connected to the power amplifier electricity of two sound passages of prime by electrode
Road output end；Design two class energy transducers to be uniformly distributed on sounding panel, this is to realize that two class energy transducers are sent
The reciprocal beam of sound of phase can effectively be liquidated in communication process.
4. according to claim 1 orient sound system based on active demodulation from silence, it is characterised in that：Described master
Dynamic sound demodulating equipment is that layout has multiple reflecting plates or reflector, reflecting plate and reflector in a physical reflection cavity, cavity
On have the continuant orifice of uniform design；It is in order that beam of sound is demodulated in sound that Active Acoustic demodulating equipment is installed outside opposite-flushing type sounding panel
Reflect and spread out of through repeatedly coming and going in the physics cavity of device, repeatedly round reflection process adds beam of sound in physics cavity
Residence time, the beam of sound so spread out of from Active Acoustic demodulating equipment completed one and sufficiently non-linear interacted relatively
Journey, the problem of this can effectively reduce orientation sound source near field sounds distortion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510077768.3A CN104703086B (en) | 2015-02-13 | 2015-02-13 | It is a kind of that sound system is oriented from silence based on active demodulation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510077768.3A CN104703086B (en) | 2015-02-13 | 2015-02-13 | It is a kind of that sound system is oriented from silence based on active demodulation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104703086A CN104703086A (en) | 2015-06-10 |
| CN104703086B true CN104703086B (en) | 2017-09-05 |
Family
ID=53349784
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510077768.3A Expired - Fee Related CN104703086B (en) | 2015-02-13 | 2015-02-13 | It is a kind of that sound system is oriented from silence based on active demodulation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104703086B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005039437A (en) * | 2003-07-17 | 2005-02-10 | Seiko Epson Corp | Ultrasonic speaker, and signal sound reproducing methodforf ultrasonic speaker |
| CN102197660A (en) * | 2008-11-04 | 2011-09-21 | 奥林巴斯医疗株式会社 | Acoustic oscillator and image generation device |
| CN102918421A (en) * | 2010-06-03 | 2013-02-06 | 雪佛龙美国公司 | Device and method for generating a beam of acoustic energy from a borehole, and applications thereof |
-
2015
- 2015-02-13 CN CN201510077768.3A patent/CN104703086B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005039437A (en) * | 2003-07-17 | 2005-02-10 | Seiko Epson Corp | Ultrasonic speaker, and signal sound reproducing methodforf ultrasonic speaker |
| CN102197660A (en) * | 2008-11-04 | 2011-09-21 | 奥林巴斯医疗株式会社 | Acoustic oscillator and image generation device |
| CN102918421A (en) * | 2010-06-03 | 2013-02-06 | 雪佛龙美国公司 | Device and method for generating a beam of acoustic energy from a borehole, and applications thereof |
Non-Patent Citations (2)
| Title |
|---|
| 《A Self-Silence Sound Beam》;C.M.Hedberg et al.;《Acoustical Physics》;20101231;第56卷(第5期);第637-639页 * |
| 《Feasibility of a length-limited parametric source for active noise control applications》;Bhan Lam et al.;《The 21st International Congress on Sound and Vibration》;20140717;第1-8页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104703086A (en) | 2015-06-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR100919642B1 (en) | Directive Speaker and mobile station thereof | |
| CN101895801B (en) | Equipment and method for sound focusing | |
| Kleiner | Electroacoustics | |
| US6343134B1 (en) | Loudspeaker and horn with an additional transducer | |
| US20170264998A1 (en) | Acoustic diffusion generator | |
| KR101186398B1 (en) | Apparatus for Processing an Audio Signal | |
| JP2006067386A (en) | Portable terminal | |
| JP2008535297A5 (en) | ||
| EP3198721B1 (en) | Mobile cluster-based audio adjusting method and apparatus | |
| Havelock et al. | Directional loudspeakers using sound beams | |
| CN109361991A (en) | A kind of more scene directional sound systems and its operation method based on DSP platform | |
| GB1572093A (en) | Omniphonic transducer system | |
| CN103338421A (en) | Method and device for carrying out area sound transmission by adopting acoustic frequency array | |
| CN110784799B (en) | Sound directional transmission method and system | |
| CN104703086B (en) | It is a kind of that sound system is oriented from silence based on active demodulation | |
| Mabande et al. | Towards superdirective beamforming with loudspeaker arrays | |
| US20170006379A1 (en) | A Sound Diffusion System for Directional Sound Enhancement | |
| Nakagawa et al. | Beam steering of portable parametric array loudspeaker | |
| US11558691B2 (en) | Loudspeaker array cabinet | |
| US11337002B2 (en) | Loudspeaker system with active directivity control | |
| Nakashima et al. | Prototype of mobile super directional loudspeaker | |
| JP2688051B2 (en) | Broadcast space limiting device | |
| KR20140011784A (en) | System and method for personal position directed speaker and computer-readable recording medium with program therefor | |
| US9843856B2 (en) | Acoustic set comprising a speaker with controlled and variable directivity | |
| Hill | Analysis, modeling and wide-area spatiotemporal control of low-frequency sound reproduction |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170905 Termination date: 20180213 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |