CN203136166U

CN203136166U - Air voice sound field system

Info

Publication number: CN203136166U
Application number: CN 201320145941
Authority: CN
Inventors: 王勇; 杨璐馨
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-03-28
Filing date: 2013-03-28
Publication date: 2013-08-14
Anticipated expiration: 2023-03-28

Abstract

The utility model relates to an air voice sound field system. A sound signal source is decoded and played through a sound field controller, then a sound signal is subjected to filtering and pretreatment by a processor and thus a shape of the air voice sound field is set to generate multipath audio signals, and finally sounds emitted by various loudspeakers are driven to generate a phase after a sound player carries out digital analog conversion, filtering and power amplification. As a result, the phase relative to a listener on a carrier forms a sound field of a spatial shape, the listener is enabled to experience spatial jump or slip of sounds, a wonderful sound phenomenon that sounds are elusive up and down, striking east and west and harmonic right and left is formed, the sound field is enabled to float around the listener, and the listener can experience sounds of nature.

Description

A kind of unreal sound sound field system

Technical field

The utility model relates to sound system, is specifically related to a kind of control method of unreal sound sound field and realizes the system of this method.

Background technology

Music since the human history, all be based on certain tempo variation, comprise the variation of sound intensity, with the variation of sound frequency, the tempo variation rule here can be called when being sound to be restrained, and the variation of sound frequency to say into be audio frequency rule, it is the loudness of a sound rule that the variation of sound intensity just becomes, and the spatial position change of sound is introduced in the music, just formed the empty rule of sound, i.e. the temperament that moves in the space of sound.The empty rule of sound has multiple implementation, and it all meets people's auditory perception such as the stereo music of stereo speaker broadcast, the homophonic music that multi-channel loudspeaker is play etc.But can not realize that the sound that loud speaker is sent forms the tangible sound field in a kind of space, allow the space of experiencer's perceived sounds jump or slippage, form up and down fluid, east and strike that the west is hit, the left and right sides is harmonious, the marvellous sound scene of front and back aniseikania, and the multiple sound unreal sound sound field of mixing according to ad hoc fashion.

The utility model content

The utility model provides a kind of and can form accurate sound field spatial impression in order to overcome the deficiency of above technology, produces sound and wave, jump in necessarily going to see, makes the hearer as going into the unreal sound sound field system of environment.

The technical scheme that its technical problem that overcomes the utility model adopts is:

This realizes the system of above-mentioned unreal sound sound field control method, comprise carrier, be installed on the sound field controller that the power supply in the carrier is connected, described sound field controller is connected in for the sound signal source of store digital music and processor, distributing in the spatial dimension around the described carrier is equipped with some loud speakers, and described each loud speaker is connected in processor by Audio Players.

Operation for convenience, make the comfortable and unreal sound definition of hearer height, above-mentioned carrier is chaise longue shape, it comprises support, be fixed in chair body on the support, be connected in the handrail of chair body and support, the touch LCD screen is installed on the described handrail, described touch LCD screen is connected in sound field controller, the ring support that is positioned at directly over the chair body is installed on the described support, the annular loudspeaker array that some loud speakers are formed is installed on the ring support ringwise, the chair body loudspeaker array that some loud speakers are formed be installed on the chair body around.

For fear of the influence of electric power outputting current to unreal sound quality, above-mentioned power supply is D.C. regulated power supply or rechargeable battery, and described sound field controller is dsp processor, and USB interface is connected in dsp processor.

The power amplifier that the tut player comprises digital to analog converter, is connected in the filter of digital to analog converter and is connected in filter, described digital to analog converter is connected in processor, described loud speaker is connected in power amplifier, the output signal distortion factor of described power amplifier less than its passage consistency error of one thousandth less than 0.1dB.。

In order to make its characteristic unanimity of all loud speakers, above-mentioned all loud speakers are the same batch products of same producer, its loud speaker magnetic material adopts the Ru-Fe-Mn permanent magnetic material, be provided with packing ring between described loud speaker and the carrier, described loud speaker rear end is equipped with bonnet, form back cavity between loud speaker and the bonnet, described bonnet be plastic material its form by the mold injection manufacturing.

The beneficial effects of the utility model are: by the sound field controller decoding signal source that plays sound, thereby processor is done filtering and preliminary treatment to voice signal and is set the shape of unreal sound sound field and generate multipath audio signal afterwards, finally carry out digital-to-analogue conversion through Audio Players, filtering, the sound generating phase place that each loud speaker of power amplification rear drive sends, make the hearer who is positioned at relatively on the carrier form the sound field that there is type in a kind of space, jump or slippage in the space that makes the hearer experience sound, form fluid up and down, east is struck the west and is hit, the marvellous sound scene that the left and right sides is harmonious, make sound field center on the hearer and wave, make the hearer experience heaven's harmony.

Description of drawings

Fig. 1 is the utility model control system theory diagram;

Fig. 2 is the utility model control system structural representation block diagram;

Fig. 3 is the structural representation of the unreal sound sound field of chaise longue structure of the present utility model system;

Fig. 4 be among Fig. 3 A to structural representation;

Fig. 5 be among Fig. 3 B to structural representation;

Among the figure, 1. sound signal source 2. sound field controllers 3. processors 4. Audio Players 5. loudspeaker arrays 6. loud speakers 7. power amplifiers 8. filters 9. digital to analog converter 10.DSP processors 11. touch LCDs shield 12. D.C. regulated power supply 13.USB interfaces, 14. chair bodies, 15. handrails, 16. ring supports, 17. supports, 18. annular loudspeaker array 19. chair body loudspeaker arrays.

Embodiment

Be described further below in conjunction with accompanying drawing 1, accompanying drawing 2, accompanying drawing 3, accompanying

drawing

4,5 pairs of the utility model of accompanying drawing.

As shown in Figure 1, unreal system for electrical teaching can be designed to various forms, it is designed to a kind of chaise longue structure in the present embodiment, as shown in Figure 3, comprise carrier, be installed on the sound field controller 2 that the power supply in the carrier is connected, described sound field controller 2 is connected in for the sound signal source 1 of store digital music and processor 3, and distributing in the spatial dimension around the described carrier is equipped with some loud speakers 6, and described each loud speaker 6 is connected in processor 3 by Audio Players 4.By the sound field controller 2 decoding signal source 1 that plays sound, thereby 3 pairs of voice signals of processor are done filtering and preliminary treatment and are set the shape of unreal sound sound field and generate multipath audio signal afterwards, finally through Audio Players 4 carry out digital-to-analogue conversion, filtering, each loud speaker of power amplification rear drive the 6 sound generating phase places of sending, make to be combined into the sound field that there is type in a kind of space, thereby realize producing unreal sound.

Loud speaker 6 in the loudspeaker array 5 described above is power 1w-5w, the miniature loudspeaker of frequency range 100Hz-15kHz, and the representative value of number of loudspeakers is 32, can increase and decrease.The sound that loudspeaker array 5 sends can form the wave beam of sound in finite interval, namely form acoustic image, and the center of this sound wave beam can be used as the center of acoustic image by the hearer.The phase error of each loud speaker 6 on the described loudspeaker array 5 is less than 2 degree (1kHz), and range error is less than 1dB(1kHz).Described loudspeaker array 5 links together with described Audio Players 4, to be a control change into power signal with the voltage waveform of voice signal to described Audio Players 4 is transported on the loud speaker in order to play out the parts of sound true to nature, has fidelity performance preferably, distortion when being the voice signal amplification is little, noise is low, bandwidth, dynamic range is big.

As shown in Figure 2, sound field controller 2 is a control play list and volume, sets the unit of the shape of unreal sound sound field, and described sound field controller 2 comprises described dsp processor 10.Described sound field controller 2 is connected to described sound signal source 1, also can import play list from the outside or extract the song that will play from internal memory.Dsp processor can be used for unreal sound sound field global function control being comprised the sound broadcast, screen display, response operating key etc. with the TMS320VC5509 mini system plate of TI company.Can utilize USB2.0 mouth extrapolation USB flash disk, read the original tune signal of music from USB flash disk, perhaps link with computer, in computer, obtain music file, or the music data handled of the machine as calculated of obtaining.Internal memory is deposited certain music data, also can utilize storage cards such as SD card to read music data.

Sound field controller 2 is connected with processor 3, processor 3 is signal processing units, processor 3 forms a kind of algorithm according to the requirement of sound field control, multi-channel sound signal is delayed time and filter preprocessing according to time reversal principle, and the sound that makes all loud speakers play out reconstructs the sound field of a setting in the space.In the such scheme, the sound field control technology mainly is to utilize loudspeaker array 5 to realize the Overlay of sound, the preliminary treatment of delaying time the time of advent of the sound that each loud speaker 6 that calculates according to default acoustic image positions sends, the sound that all loud speakers 6 send forms tangible acoustic image after combination.Preliminary treatment to sound comprises time-delay and filtering, and time-delay and filtering can utilize processor 3 to realize by unreal audio fruit process software.Unreal audio fruit process software constructs the pattern of a series of sound field changes according to the empty rule of sound principle, and each schema construction is gone out algorithm, comes preliminary treatment is carried out in the signal output of each passage, thereby realizes the phase control of the signal of multichannel loud speaker 6.The mode of handling will design according to the empty rule of sound achievement in research, comprise that people's ear is to the reaction speed of acoustic space sense, the response of the variation of spatial dimension size, the restriction of saltation velocity hop range, drift velocity and mode, volume change, note or phrase, the corresponding relation of the empty rule of music type and sound etc.Pretreated mode realizes according to the aerial propagation law of sound.On the one hand along with propagation distance prolongs the diffusive attenuation that produces, being directed at sound dies down, be absorbed in the air of sound on the other hand, the attenuation that absorption causes is directly proportional with distance, but the sound absorption coefficient difference of different frequency, absorption misses to subtract and causes sound to become " look ", therefore will consider diffusive attenuation and attenuation by absorption.Sound field control also will be considered the geometry of loudspeaker array, and the combination acoustic image effect of the loud speaker battle array of different structure has bigger difference, mainly is the effect difference that suppresses the virtual image.Need to realize through optimal design the array of minimum virtual image effect.The key of phase control technology is the phase place of each loud speaker path signal of control, reaches the target of regulating the sound field form.Phase control has dual mode, and a kind of is directly signal to be handled time-delay output, and another kind is amplitude and the phase place of considering signal simultaneously, namely adopts transfer function method to realize preliminary treatment.A kind of mode in back can be taken into account the decay correction of sound transmission, so more accurate.Directly the time expander method preliminary treatment is simple, needs only the amount of delay that calculates sound transmission according to the distance of certain loud speaker and target sound source position, and the signal to this loud speaker carries out pre-anti-delay again, just can obtain certain space audio-visual effects.The foundation of transfer function method is, the sound that i loud speaker sent

, propagate into the variation of the impact point that will control

, represent with a function

The function is here represented with frequency domain form.

So the signal of loud speaker will be modified as

, be transformed into the mode of reversing with the time again behind the time-domain Wave data and play.

Thereby change into power signal and drive each loud speaker 6 sounding and produce unreal sound thereby its each road voice signal of multipath audio signal that processor 3 generates carries out after digital-to-analogue conversion, filtering, the power amplification voltage waveform with voice signal successively by the digital to analog converter that comprises 9 in the Audio Players, filter 8, power amplifier 7.

The control of each road signal is the voltage by the voice signal of controlling each moment point on the loudspeaker array 5, namely according to pretreated signal, controls the amplitude that each loud speaker is sounded in each moment point.This control mode can be synchronous, also can be asynchronous.Synchronous control mode is exactly that each allows the signal source of passage of each loud speaker correspondence upgrade output synchronously constantly, make like this and calculating the error that has no time when sound field is controlled, but control circuit is more complex, an output control signal synchronously need be arranged, asynchronous control mode is the order according to scanning, and constantly to passage update signal one by one, this mode is poor if having time for each, when calculating each channel sound signal, preliminary treatment to consider that control circuit is simple.

Unreal sound sound field control method of the present utility model play sound can acoustic image be determined in certain position according to user's requirement, perhaps change according to certain rules, be a kind of in virtual sound field control system.Play the frequency band range of music at 100Hz-16kHz, sound pressure level is listened attentively at suitable people's ear of 24dB-74dB.Its unreal audio really is the sound field that there is type in a kind of space, jumps or slippage in the space that makes the hearer experience sound, and the marvellous sound scene that the west is hit, the left and right sides is harmonious is struck in fluid about forming, east, makes sound field center on the hearer and waves, and makes the hearer experience heaven's harmony.

The utility model has also designed the unreal sound sound field system that implements above-mentioned unreal sound sound field control method.

Above-mentioned carrier is chaise longue shape, it comprises support 17, be fixed in chair body 14 on the support 17, be connected in the handrail 15 of chair body 14 and support 17, touch LCD screen 11 is installed on the described handrail 15, described touch LCD screen 11 is connected in sound field controller 2, the ring support 16 that is positioned at directly over the chair body 14 is installed on the described support 17, the annular loudspeaker array 18 that some loud speakers 6 are formed is installed on the ring support 16 ringwise, the chair body loudspeaker array 19 that some loud speakers 6 are formed be installed on chair body 14 around.Touch LCD screen 11 is installed on the handrail 15, can make things convenient for the hearer when lying in chair body 14 and listen to unreal sound music by 11 pairs of sound field preset state of touch LCD screen, unreal sound control molding formula is adjusted, and can also check that the melody tabulation shows sound field control procedure etc. by it.Chair body loudspeaker array 19 above the chair body around the annular loudspeaker array 18 of installation and the chair body has formed loudspeaker array 5 jointly, can obtain to have relief unreal sound result of broadcast.Can obtain equally distributed sound field by the annular loudspeaker array 18 among this embodiment, the beam side lobe of its synthetic video is low, acoustic image definition height.

Above-mentioned power supply is D.C. regulated power supply 12 or rechargeable battery, and described sound field controller 2 is dsp processor 10, and usb 13 is connected in dsp processor 10, and dsp processor 10 can utilize USB interface extrapolation USB flash disk, reads the original tune signal of music from USB flash disk.In order to ensure the stationarity of output current, should adopt the minimum linear stabilized power supply of chargeable battery or ripple coefficient, can not use Switching Power Supply.

The power amplifier 7 that tut player 4 comprises digital to analog converter 9, is connected in the filter 8 of digital to analog converter 9 and is connected in filter, described digital to analog converter 9 is connected in processor 3, described loud speaker 6 is connected in power amplifier 7, the output signal distortion factor of described power amplifier 17 less than its passage consistency error of one thousandth less than 0.1dB.The linearity of its median filter 8 is good, is limited to 20kHz on the frequency range, and anti-electromagnetic interference capability is strong, and power amplifier is 10w.Filter circuit requires noise little, undistorted, and the output signal distortion factor is less than 1 ‰.The passage consistency error is less than 0.1dB.Require the isolation of each passage to reach 68dB-84dB simultaneously.So the ground wire of the analog circuit of passage is not altogether, walking independently, power line is independent ambulation also, and simulation part independent power source filter capacitor will be with the high-quality alminium electrolytic condenser of 1400 μ F/25v.Each passage amplifies independently, and the ground wire of analog circuit is walked not altogether independently, and power line is independent ambulation also, up to the contact point of loud speaker, just all ground wires is connected on the point.Require the components and parts of analog circuit just the same, the wiring form is just the same.Filter 8 circuit adopt the active filter circuit that contains amplifier, use the Bezier mode filter, particularly require the phase effect of 8 pairs of signals of filter little.Loud speaker 6 is last sounding components, requires to select function admirable, bandwidth, high-fidelity, the loud speaker 6 of same batch of production of same producer, magnetic material rubidium iron B permanent magnetic material, and loud speaker 6 can not be near thermal source.Particularly to sending out the burin-in process of paper disc, will prevent that in use high overload from impacting, the installation of loud speaker is wanted firmly the part non-loosening to be installed, and seamless, back cavity does not have leakage sound, and nothing is crosstalked, and prevent that holding wire from touching the paper disc of loud speaker 6, otherwise can produce abnormal sound.The installation requirement of loud speaker 6 adopts the packing ring of same material, and the bonnet shape is just the same, but wants independent mutually, namely can not communicate between the back cavity that each loud speaker 6 is installed.Bonnet can adopt mould to be pressed into unified shape, uses plastic production.The external form of stem is also just the same, and lead-in wire can not touch with back cavity shell and loud speaker paper disc.

Sound fidelity Technology Need is realized from the technology of three aspects: use the good loud speaker 6 of the broadband linearity and have good consistency, sound adopts transfer function method preliminary treatment and the intersegmental connection of voice signal well not to produce jump, unreal sound control algorithm processed is good, can simulate good Space.The lower frequency limit 100Hz of loud speaker, upper limiting frequency 16kHz, impedance 8 Ω, sensitivity 80dB, the phase equalization error is less than 1 degree (1kHz), the amplitude conformity error is less than 1dB(1kHz), power 15w.The sample rate 48kHz of Digital Signal Processing, 24bit quantizes, the noise 5 μ v of analog line.The signal segment of Digital Signal Processing connects good, and no breakpoint can be assigned to different loud speaker sounding to multiple sound-source signal.Unreal sound control system can realize the pattern of multiple different audios, and the fastest jump speed can not exceed the reflection speed of people's ear, i.e. the fastest about 24 frames/s.

Claims

1. unreal sound sound field system, it is characterized in that: comprise carrier, be installed on the sound field controller (2) that the power supply in the carrier is connected, described sound field controller (2) is connected in for the sound signal source (1) of store digital music and processor (3), distributing in the spatial dimension around the described carrier is equipped with some loud speakers (6), and described each loud speaker (6) is connected in processor (3) by Audio Players (4).

2. unreal sound sound field according to claim 1 system, it is characterized in that: described carrier is chaise longue shape, it comprises support (17), be fixed in the chair body (14) on the support (17), be connected in the handrail (15) of chair body (14) and support (17), touch LCD screen (11) is installed on the described handrail (15), described touch LCD screen (11) is connected in sound field controller (2), the ring support (16) that is positioned at directly over the chair body (14) is installed on the described support (17), the annular loudspeaker array (18) that some loud speakers (6) are formed is installed on the ring support (16) ringwise, the chair body loudspeaker array (19) that some loud speakers (6) are formed be installed on chair body (14) around.

3. unreal sound sound field according to claim 1 system, it is characterized in that: described power supply is D.C. regulated power supply (12) or rechargeable battery, described sound field controller (2) is dsp processor (10), and USB interface (13) is connected in dsp processor (10).

4. according to claim 1 or 2 or 3 described unreal sound sound field systems, it is characterized in that: the power amplifier (7) that described Audio Players (4) comprises digital to analog converter (9), is connected in the filter (8) of digital to analog converter (9) and is connected in filter, described digital to analog converter (9) is connected in processor (3), described loud speaker (6) is connected in power amplifier (7), the output signal distortion factor of described power amplifier (17) less than its passage consistency error of one thousandth less than 0.1dB.

5. unreal sound sound field according to claim 4 system, it is characterized in that: described all loud speakers (6) are the same batch products of same producer, its loud speaker magnetic material adopts the Ru-Fe-Mn permanent magnetic material, be provided with packing ring between described loud speaker (6) and the carrier, described loud speaker (6) rear end is equipped with bonnet, form back cavity between loud speaker (6) and the bonnet, described bonnet be plastic material its form by the mold injection manufacturing.