CN102438192B - Audio parametric array speaker system and modulation method thereof - Google Patents
Audio parametric array speaker system and modulation method thereof Download PDFInfo
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- CN102438192B CN102438192B CN201110420128.XA CN201110420128A CN102438192B CN 102438192 B CN102438192 B CN 102438192B CN 201110420128 A CN201110420128 A CN 201110420128A CN 102438192 B CN102438192 B CN 102438192B
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Abstract
The invention provides an audio parametric array speaker system and a modulation method thereof. A pulse density modulation module is added in the system, and a signal having a follow-up processing function can be obtained. The method comprises the following steps of: performing carrier wave modulation, pulse density modulation, demultiplexing, direction adjustment and multi-direction signal superposition on digital audio signals, and transmitting ultrasound through an energy amplification and ultrasonic transduction array. Therefore, an outputted audio signal has functions of timely adjusting a direction and simultaneously playing sound in a plurality of strong directional directions. In addition, a digital signal system has the advantages of anti-interference, high integration and chip design.
Description
[technical field]
The present invention relates to a kind of speaker system, relate in particular to a kind of parametric acoustic array speaker system and modulator approach thereof of carrying out carrier modulation by digital form.
[background technology]
Along with the fast development of acoustic technique, the speaker system of high-quality has been widely used in every field and occasion, and with the parametric acoustic array loud speaker of directive property in the mode of its high directivity, transonic widely people welcome, it is long-distance communications, without the ultra-thin loudspeaker structure of audio amplifier and magnet coil, has opened up a new application, and its application scenario has: the occasions such as conference hall, exhibition center, museum and secure communication.People not only require it to have directed transaudient function, more require this parametric acoustic array loud speaker to have the feature of multiple directions acoustic, can meet client and can receive in multiple directions the demand of sound.
Parametric acoustic array loud speaker is generally divided into two kinds of analogue system and digital systems, and its analogue system is to carry out carrier modulation by analogue device, uses AB class power amplifier device to carry out power amplification, then penetrates ultrasonic by one group of ultrasonic transducer paroxysm; Its digital system is to carry out carrier modulation by digital form, output pulse width modulation (Pulse Width Modulation, PWM) signal, carries out power amplification through D class digital power amplifying device, then penetrates ultrasonic by one group of ultrasonic transducer paroxysm.But the high efficiency of the height integration of digital system and D class digital power amplifying device is more superior than traditional analogue system.
Due to the parametric acoustic array loud speaker digital system of correlation technique by signal after carrier modulation, output pulse width modulation signal, and pulse width modulating signal does not have the function of follow-up signal processing, be difficult for realizing the controlled function of direction, can only be solely ultrasonic to the positive surface launching of transmitting battle array.And a lot of businessmans realize the controllability of audio direction by mechanical device, not only increased volume and the complexity of system, and operation and maintenance is all inconvenient.Meanwhile, the controllability that adopts mechanical device to realize direction needs certain start-up time and dwell time, and directional precision is limited, and the direction of propagation of sound can not change continuously, and the directive property direction of this loud speaker only has one conventionally.Do not meet very much client to there being the demand of loud speaker of multi-direction sound conduction function.
Therefore, being necessary to propose a kind of new audio-frequency playback system of parametric acoustic array overcomes the problems referred to above in fact.
[summary of the invention]
The technical problem that the present invention need solve is to provide a kind of parametric acoustic array speaker system and method thereof that can realize multiple directions playback simultaneously and can adjust arbitrarily its playback direction.
The present invention realizes by such technical scheme:
A kind of parametric acoustic array speaker system, it comprises: carrier modulation treatment device, the power amplifier device being connected with carrier modulation treatment device and the ultrasound transducer array being connected with power amplifier device, is characterized in that: described carrier modulation treatment device comprises:
Carrier amplitude modulating unit, for receiving digital audio and video signals s, multiplies each other digital audio and video signals and carrier signal c, with the carrier signal c after being modulated
a;
Pulse density modulated unit, for the output signal c of reception carrier amplitude modulation unit
a, and by following formula, it is carried out to pulse density modulated PDM, and obtain by n single-bit carrier signal b
nthe single-bit stream carrier signal c of composition
aP,
c
AP＝[b
1?b
2?b
3?...b
n]＝PDM{c
A}；
Grouping and direction adjustment unit, for the single-bit stream carrier signal c of received pulse density modulation unit output
aP, and press framework matrix FRAME to signal c
aPcarry out K grouping, obtain K packet signal G
k, then will adjust G by STEER
ktravel direction is adjusted, and then obtains the signal W after direction is adjusted
k,
Wherein, the columns that m is framework matrix, b
kbe the expression formula of first single-bit carrier signal of K road signal, b
mkbe the expression formula of m single-bit carrier signal of K group signal, D
1to D
kfor K group G
kthe directioin parameter of signal;
Multi-direction pulse signal superpositing unit, the signal W after receive direction is adjusted
k, and by following formula, it is carried out to the pulse signal W that preset direction is all directions of P
koverlap-add procedure, obtain the composite carrier signal signal T after the stack of P direction
k,
As a modification of the present invention, between described power amplifier device and ultrasound transducer array, be also provided with and connect the two and in order to the low pass filter of filter away high frequency noise.
As a modification of the present invention, the high-frequency noise frequency of low pass filter filtering is greater than f
c+ 20KHz, wherein, f
cfor carrier frequency.
As a modification of the present invention, described low pass filter comprises 8 rank analog circuits.
As a modification of the present invention, described power amplifier module adopts D class digital power amplifier.
A modulator approach for parametric acoustic array speaker system, its modulator approach comprises the steps:
Step S001: digital audio and video signals s is provided, the carrier modulation treatment device that is provided with carrier wave c is provided, modulate by carrier amplitude, carrier wave c and digital audio and video signals s are multiplied each other, obtain the carrier wave c after amplitude modulation(PAM)
a, that is:
c
A＝c·s＝[c
1s
1?c
2s
2?c
3s
3...c
ns
n]
Wherein, n is the sampling period length of digital audio and video signals S;
Step S002: to the carrier wave c after amplitude modulation(PAM)
acarry out pulse density modulated, obtain by n single-bit carrier signal b
nthe single-bit stream carrier wave c of composition
aP:
c
AP＝[b
1?b
2?b
3...b
n]＝PDM{c
A}；
Step S003: signal grouping, by the single-bit stream carrier wave c of pulse density modulated signal
aPby following formula, be decomposed into K road signal G
k:
Wherein, m is this matrix column number;
Step S004: default D
kfor directioin parameter, by K road signal G
krespectively independently with directioin parameter D
kconvolution, the K road carrier wave W adjusting to obtain direction
k;
Step S005: preset and exist P direction to carry out playback, by W corresponding each direction
kmatrix superposes, and finally obtains the carrier wave T of K road after comprehensive
k;
Step S006: by K road carrier wave T
kafter amplifying by power amplifier device, deliver to ultrasound transducer array and launch, demodulation the audio signal s that reduces in final P direction after adjustment.
As a modification of the present invention, in step 006, carrier wave T
kafter power amplifier device is processed, then pass through the low pass filter processing in order to filter away high frequency noise, then pass to ultrasound transducer array.
As a modification of the present invention, the high-frequency noise frequency of low pass filter filtering is greater than f
c+ 20KHz, wherein, f
cfor carrier frequency.
As a modification of the present invention, described low pass filter comprises 8 rank analog circuits.
As a modification of the present invention, described power amplifier is D class digital power amplifier.
Compared with correlation technique, parametric acoustic array speaker system of the present invention is utilized the two-forty of pulse density modulated signal, the characteristic of single-bit, digital carrier signal is modulated, and signal after pulse density modulated possesses the advantage that can decompose multichannel and can realize direction adjustment and multi-direction stack, thereby the voice signal that makes this system output possesses direction to be adjusted arbitrarily in real time, the function of multiple highly directive directions playback simultaneously.
[accompanying drawing explanation]
Fig. 1 is the groundwork schematic flow sheet of parametric acoustic array speaker system one embodiment of the present invention.
[embodiment]
Below in conjunction with drawings and embodiments, the invention will be further described.
As shown in Figure 1, a kind of parametric acoustic array speaker system 10, wherein, parametric acoustic array speaker system 10 comprises for receiving digital audio and video signals and this digital audio and video signals being processed and the carrier modulation treatment device 11 of the different multiplex pulse signal of outbound course successively, the multiplex pulse signal Bing Duige road pulse signal of reception after the direction adjustment of carrier modulation treatment module output carries out power amplification makes it change into the power amplifier device 12 of each road ultrasonic signal, and be received from power amplifier module output ultrasonic signal Bing Jiangge road, Ge road ultrasonic signal and be converted into ultrasonic wave and export extraneous ultrasound transducer array 13 to.Wherein, carrier modulation treatment device comprises carrier amplitude modulating unit 110, pulse density modulated unit 111, grouping and direction adjustment unit 112, multi-direction pulse signal superpositing unit 113, in power amplifier device 12, include multiple digital power amplifiers 120, in the present embodiment, adopt the higher D class digital power amplifier of conversion efficiency.
Pulse density modulated (Pulse Density Modulation, PDM) is the single-bit stream that by over-sampling and high-order noise shaping algorithm, general digital signal is converted into two-forty.In the present invention, by digital carrier signal is carried out to pulse density modulated, just can obtain possessing the signal that can decompose with multi-direction adjustment function, process grouping and direction adjustment unit 112 and multi-direction pulse signal superpositing unit 113 are processed successively again, and amplify through D class digital power amplifying device, finally by organizing ultrasonic transducer battle array, to multiple any directions, send ultrasonic more, just can obtain that direction can be adjusted immediately, the voice signal of multiple highly directive direction playback simultaneously, thereby reached user's demand.
The modulator approach of parametric acoustic array speaker system 10 comprises the steps:
Step S001: digital audio and video signals is provided, voice signal to be modulated is converted to digital audio and video signals s by analog to digital converter;
Step S002: the carrier modulation treatment device 11 that is provided with carrier wave c is provided, carrier wave c and digital audio and video signals s are multiplied each other, obtain the carrier wave c after amplitude modulation(PAM)
a, that is:
c
A＝c·s＝[c
1s
1?c
2s
2?c
3s
3...c
ns
n]
Wherein, n is the sampling period length of digital audio and video signals S;
Step S003: pulse density modulated, by the carrier wave c after amplitude modulation(PAM)
apass to pulse density modulated device 111, carry out pulse density modulated, obtain by n single-bit carrier signal b
nthe single-bit stream carrier wave c of composition
aP:
c
AP＝[b
1?b
2?b
3...b
n]＝PDM{c
A}；
Step S004: by the single-bit stream carrier wave c of pulse density modulated signal
aPpass to grouping and direction adjusting module 112, first carry out signal grouping, according to following framework matrix FRAME to signal c
aPcarry out the grouping of K road, obtain K packet signal G
k:
Wherein, m is this matrix column number, b
kbe expressed as first single-bit carrier wave of K road signal, b
mkit is the expression formula of n single-bit carrier signal of K group signal;
Step S005: adjust G by STEER
ktravel direction is adjusted, default D
kfor directioin parameter, by K road signal G
krespectively independently with directioin parameter D
kconvolution, the K road carrier wave W adjusting to obtain direction
k;
Step S006: the signal after direction adjustment is passed to multi-direction pulse signal superpositing unit 113, preset and exist P direction to carry out playback, by W corresponding each direction
kmatrix superposes, and finally obtains the carrier wave T of K road after comprehensive
k;
Wherein, W
1 1to W
k 1the matrix K road carrier signal W that is first direction
k, W
1 pto W
k pbe the K road carrier signal W of P direction
k.
Step S007: by K road carrier wave T
kpass to digital power amplifying device 12 and amplify, after deliver to ultrasound transducer array 13 and launch.In the present embodiment, in order to remove the more noise of high band, can a low-pass filter 14 be set between digital power amplification module 12 and ultrasound transducer array 13, this low-pass filter 14 can be selected 8 rank analog circuits, by carrier frequency f
cnoise filtering more than+20KHz, then the array that filtered signal is passed to ultrasound transducer array 13 is launched, in final P direction after adjustment, carry out ultrasound non-linear demodulation, thereby reduce audio signal s.
Above-described is only embodiments of the present invention, at this, it should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise of the invention, can also make improvement, but these all belongs to protection scope of the present invention.
Claims (10)
1. a parametric acoustic array speaker system, it comprises: carrier modulation treatment device, the power amplifier device being connected with carrier modulation treatment device and the ultrasound transducer array being connected with power amplifier device, is characterized in that: described carrier modulation treatment device comprises:
Carrier amplitude modulating unit, for receiving digital audio and video signals s, multiplies each other digital audio and video signals and carrier signal c, with the carrier signal c after being modulated
a;
Pulse density modulated unit, for the output signal c of reception carrier amplitude modulation unit
a, and by following formula, it is carried out to pulse density modulated PDM, and obtain by n single-bit carrier signal b
nthe single-bit stream carrier signal c of composition
aP,
c
AP＝[b
1?b
2?b
3?...b
n]＝PDM{c
A}；
Grouping and direction adjustment unit, for the single-bit stream carrier signal c of received pulse density modulation unit output
aP, and press framework matrix FRAME to signal c
aPbe divided into K grouping, obtain K packet signal G
k, then will adjust G by STEER
ktravel direction is adjusted, and then obtains the signal W after direction is adjusted
k,
Wherein, the columns that m is framework matrix, b
kbe the expression formula of first single-bit carrier signal of K road signal, b
mkbe the expression formula of m single-bit carrier signal of K group signal, D
1to D
kfor K group G
kthe directioin parameter of signal;
Multi-direction pulse signal superpositing unit, the signal W after receive direction is adjusted
k, and by following formula, it is carried out to the pulse signal W that preset direction is all directions of P
koverlap-add procedure, obtain the composite carrier signal signal T after the stack of P direction
k,
Wherein, W
1 1to W
k 1the matrix K road carrier signal W that is first direction
k, W
1 pto W
k pbe the K road carrier signal W of P direction
k.
2. parametric acoustic array speaker system according to claim 1, is characterized in that: between described power amplifier device and ultrasound transducer array, be also provided with and connect the two and in order to the low pass filter of filter away high frequency noise.
3. parametric acoustic array speaker system according to claim 2, is characterized in that: the high-frequency noise frequency of low pass filter filtering is greater than f
c+ 20KHz, wherein, f
cfor carrier frequency.
4. parametric acoustic array speaker system according to claim 3, is characterized in that: described low pass filter comprises 8 rank analog circuits.
5. according to the parametric acoustic array speaker system described in claim 1 to 4 any one, it is characterized in that: described power amplifier device adopts D class digital power amplifier.
6. the modulator approach based on parametric acoustic array speaker system claimed in claim 1, is characterized in that: this modulator approach comprises the steps:
Step S001: digital audio and video signals s is provided, the carrier modulation treatment device that is provided with carrier wave c is provided, modulate by carrier amplitude, carrier wave c and digital audio and video signals s are multiplied each other, obtain the carrier wave c after amplitude modulation(PAM)
a, that is:
c
A＝c·s＝[c
1s
1?c
2s
2?c
3s
3?...c
ns
n]
Wherein, n is the sampling period length of digital audio and video signals S;
Step S002: to the carrier wave c after amplitude modulation(PAM)
acarry out pulse density modulated, obtain by n single-bit carrier signal b
nthe single-bit stream carrier wave c of composition
aP:
c
AP＝[b
1?b
2?b
3?...b
n]＝PDM{c
A}；
Step S003: signal grouping, by the single-bit stream carrier wave c of pulse density modulated signal
aPby following formula, be decomposed into K road signal G
k:
Wherein, m is this matrix column number;
Step S004: default D
kfor directioin parameter, by K road signal G
krespectively independently with directioin parameter D
kconvolution, the K road carrier wave W adjusting to obtain direction
k;
Step S005: preset and exist P direction to carry out playback, by W corresponding each direction
kmatrix superposes, and finally obtains the carrier wave T of K road after comprehensive
k;
Wherein, W
1 1to W
k 1the matrix K road carrier signal W that is first direction
k, W
1 pto W
k pbe the K road carrier signal W of P direction
k;
Step S006: by K road carrier wave T
kafter amplifying by power amplifier device, deliver to ultrasound transducer array and launch, demodulation the audio signal s that reduces in final P direction after adjustment.
7. the modulator approach of parametric acoustic array speaker system according to claim 6, is characterized in that: in described step S006, and carrier wave T
kafter power amplifier device is processed, then pass through the low pass filter processing in order to filter away high frequency noise, then pass to ultrasound transducer array.
8. the modulator approach of parametric acoustic array speaker system according to claim 7, is characterized in that: the high-frequency noise frequency of low pass filter filtering is greater than f
c+ 20KHz, wherein, f
cfor carrier frequency.
9. the modulator approach of parametric acoustic array speaker system according to claim 8, is characterized in that: described low pass filter comprises 8 rank analog circuits.
10. according to the modulator approach of the parametric acoustic array speaker system described in claim 6 to 9 any one, it is characterized in that: described power amplifier device is D class digital power amplifier.
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| CN102438192B true CN102438192B (en) | 2014-04-16 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102636786A (en) * | 2012-05-17 | 2012-08-15 | 绵阳市浦发电子科技有限公司 | Detecting sonar for underwater buried objects based on parametric array |
| CN102780964B (en) * | 2012-08-09 | 2016-08-10 | 广州励丰文化科技股份有限公司 | Professional loudspeaker system method of adjustment |
| CN102780965B (en) * | 2012-08-09 | 2016-08-10 | 广州励丰文化科技股份有限公司 | Stage, video professional sound system bearing calibration |
| CN102811412B (en) * | 2012-08-09 | 2016-09-28 | 广州励丰文化科技股份有限公司 | A kind of professional loudspeaker system method of adjustment |
| CN104808212A (en) * | 2015-05-05 | 2015-07-29 | 深圳星宇远程定向测控技术有限公司 | Parametric-array remote fish finding system |
| CN107453821B (en) * | 2017-07-05 | 2021-03-23 | 厦门声戎科技有限公司 | Acoustic covert communication method based on array orientation |
| CN111816155A (en) * | 2020-07-03 | 2020-10-23 | 电子科技大学 | Expandable and wave beam controllable directional sound wave transmitting device |
| CN111818422B (en) * | 2020-07-03 | 2021-10-26 | 电子科技大学 | Fixed-point sound wave transmitting device based on parametric array principle |
| CN112601155A (en) * | 2020-12-10 | 2021-04-02 | 南京汉得利智能科技有限公司 | Method and system for digital parametric array loudspeaker |
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| JP2005039437A (en) * | 2003-07-17 | 2005-02-10 | Seiko Epson Corp | Ultrasonic speaker, and signal sound reproducing methodforf ultrasonic speaker |
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| US20070183605A1 (en) * | 2006-02-03 | 2007-08-09 | Seiko Epson Corporation | Method of controlling output of ultrasonic speaker, ultrasonic speaker system, and display device |
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Address after: 518057 Nanshan District province high tech Industrial Park, Shenzhen, North West New Road, No. 18 Co-patentee after: AAC TECHNOLOGIES (NANJING) Co.,Ltd. Patentee after: AAC ACOUSTIC TECHNOLOGIES (SHENZHEN) Co.,Ltd. Co-patentee after: AAC Acoustic Technologies (Changzhou) Co.,Ltd. Address before: 518057 Nanshan District province high tech Industrial Park, Shenzhen, North West New Road, No. 18 Co-patentee before: AAC Acoustic Technology Research Development (Nanjing) Co.,Ltd. Patentee before: AAC ACOUSTIC TECHNOLOGIES (SHENZHEN) Co.,Ltd. Co-patentee before: AAC Acoustic Technologies (Changzhou) Co.,Ltd. |
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Effective date of registration: 20170527 Address after: Singapore Ang Mo Kio 65 Street No. 10 techpoint Building 1 floor, No. 8 Co-patentee after: AAC TECHNOLOGIES (NANJING) Co.,Ltd. Patentee after: AAC TECHNOLOGIES Pte. Ltd. Co-patentee after: AAC Acoustic Technologies (Changzhou) Co.,Ltd. Address before: 518057 Nanshan District province high tech Industrial Park, Shenzhen, North West New Road, No. 18 Co-patentee before: AAC TECHNOLOGIES (NANJING) Co.,Ltd. Patentee before: AAC ACOUSTIC TECHNOLOGIES (SHENZHEN) Co.,Ltd. Co-patentee before: AAC Acoustic Technologies (Changzhou) Co.,Ltd. |
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Granted publication date: 20140416 Termination date: 20211215 |