CN102438192A - 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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- CN102438192A CN102438192A CN201110420128XA CN201110420128A CN102438192A CN 102438192 A CN102438192 A CN 102438192A CN 201110420128X A CN201110420128X A CN 201110420128XA CN 201110420128 A CN201110420128 A CN 201110420128A CN 102438192 A CN102438192 A CN 102438192A
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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 through digital form.
[background technology]
Fast development along with acoustic technique; High-quality speaker system has been widely used in every field and occasion; And the parametric acoustic array loud speaker that has directive property with the mode of its high directivity, transonic widely people welcome; It is that the ultrathin loudspeaker structure of long-distance communications, no audio amplifier and magnet coil has been opened up a new application, and its application scenario has: occasions such as conference hall, exhibition center, museum and secure communication.People not only require it that directed transaudient function is arranged, and require this parametric acoustic array loud speaker to have the characteristics of a plurality of direction acoustics more, can satisfy the client can both receive sound in a plurality of directions demand.
The parametric acoustic array loud speaker generally is divided into two kinds of analogue system and digital systems, and its analogue system is to carry out carrier modulation through analogue device, uses AB class power amplifier device to carry out power amplification, penetrates ultrasonic by one group of ultrasonic transducer paroxysm again; Its digital system is to carry out carrier modulation through digital form, and (Pulse Width Modulation, PWM) signal carry out power amplification through D class digital power amplifying device, penetrate ultrasonic by one group of ultrasonic transducer paroxysm again in the output pulse width modulation.Yet the high efficiency of the height integration of digital system and D class digital power amplifying device is more superior than conventional analogue system.
Because after the parametric acoustic array loud speaker digital system of correlation technique is passed through carrier modulation with signal; The output pulse width modulation signal; And pulse width modulating signal does not have the function that follow-up signal is handled, and is difficult for realizing the controlled function of direction, can only be ultrasonic to the positive surface launching of emission battle array singlely.And a lot of businessmans realize the controllability of audio direction through mechanical device, not only increased the volume and the complexity of system, and operation and maintenance are all inconvenient.Simultaneously, adopt mechanical device to realize that the controllability of direction needs certain start-up time and dwell time, and directional precision is limited, the direction of propagation of sound can not change continuously, and the directive property direction of this loud speaker has only one usually.Do not meet very much the demand of client to loud speaker that multi-direction sound conduction function is arranged.
Therefore, being necessary to propose a kind of new parametric acoustic array audio playback systems overcomes the problems referred to above in fact.
[summary of the invention]
The technical problem that the present invention need solve provides a kind of parametric acoustic array speaker system and method thereof that can realize the playback simultaneously of a plurality of directions and can adjust its playback direction arbitrarily.
The present invention realizes through such technical scheme:
A kind of parametric acoustic array speaker system; It comprises: carrier modulation treatment device, the power amplifier device that links to each other with the carrier modulation treatment device and the ultrasound transducer array that links to each other with power amplifier device, and it is characterized in that: said carrier modulation treatment device comprises:
The carrier amplitude modulating unit is used to receive digital audio and video signals s, digital audio and video signals and carrier signal c is multiplied each other, with the carrier signal c after obtaining modulating
A
The pulse density modulated unit is used for the output signal c of reception carrier amplitude modulation unit
A, and it is carried out pulse density modulated PDM by following formula, and obtain by n single-bit carrier signal b
nThe single-bit stream carrier signal c that forms
AP,
c
AP＝[b
1?b
2?b
3?...b
n]＝PDM{c
A}；
Divide into groups and the direction adjustment unit, be used 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, again will be through the STEER adjustment to G
kThe travel direction adjustment, and then obtain the adjusted signal W of direction
k,
Wherein, m is the columns of 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
kBe K group G
kThe directioin parameter of signal;
Multi-direction pulse signal superpositing unit, the adjusted signal W of receive direction
k, and it is carried out the pulse signal W that preset direction is all directions of P by following formula
kOverlap-add procedure, obtain the composite carrier signal signal T after the stack of P direction
K,
As a kind of improvement of the present invention, also be provided with between said power amplifier device and the ultrasound transducer array and connect the two and in order to the low pass filter of filter away high frequency noise.
As a kind of improvement of the present invention, the high-frequency noise frequency of low pass filter filters out is greater than f
c+ 20KHz, wherein, f
cBe carrier frequency.
As a kind of improvement of the present invention, said low pass filter comprises 8 rank analog circuits.
As a kind of improvement of the present invention, said power amplifier module adopts D class digital power amplifier.
A kind of modulator approach of 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 that is provided with carrier wave c device is provided,, carrier wave c and digital audio and video signals s are multiplied each other, obtain the carrier wave c behind the amplitude modulation(PAM) through carrier amplitude modulation
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 behind the amplitude modulation(PAM)
ACarry out pulse density modulated, obtain by n single-bit carrier signal b
nThe single-bit stream carrier wave c that forms
AP, then:
c
AP＝[b
1?b
2?b
3...b
n]＝PDM{c
A}；
Step S003: signal packets, with the single-bit stream carrier wave c of pulse density modulated signal
APBe decomposed into K road signal G by following formula
k:
Wherein, m is this matrix column number;
Step S004: preset D
kBe directioin parameter, with K road signal G
kRespectively independently with directioin parameter D
kConvolution is to obtain the K road carrier wave W of direction adjustment
k
Step S005: preset exist P direction to carry out playback, with the W of each direction correspondence
kMatrix superposes, and finally obtains the carrier wave T of K road after comprehensive
K
Step S006: with K road carrier wave T
KLaunch through delivering to ultrasound transducer array after the power amplifier device amplification, finally the demodulation and the audio signal s that reduces on an adjusted P direction.
As a kind of improvement of the present invention, in the step 006, carrier wave T
KAfter power amplifier device is handled, handle through low pass filter again in order to filter away high frequency noise, then pass to ultrasound transducer array.
As a kind of improvement of the present invention, the high-frequency noise frequency of low pass filter filters out is greater than f
c+ 20KHz, wherein, f
cBe carrier frequency.
As a kind of improvement of the present invention, said low pass filter comprises 8 rank analog circuits.
As a kind of improvement of the present invention, said power amplifier is a D class digital power amplifier.
Compare 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 the signal after pulse density modulation possesses the advantage that can decompose multichannel and can realize direction adjustment and multi-direction stack, thereby makes the voice signal of this system's output possess direction adjustment arbitrarily in real time, the function of a plurality of highly directive directions playback simultaneously.
[description of drawings]
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 accompanying drawing and execution mode the present invention is described further.
As shown in Figure 1; A kind of parametric acoustic array speaker system 10; Wherein, parametric acoustic array speaker system 10 comprises and is used to receive digital audio and video signals and this digital audio and video signals is handled successively and the carrier modulation treatment device 11 of the different multiplex pulse signal of outbound course, received through the adjusted multiplex pulse signal of direction of carrier modulation treatment module output and each road pulse signal is carried out power amplification and make its power amplifier device that changes into each road ultrasonic signal 12 and be received from each road ultrasonic signal of power amplifier module output and each road ultrasonic signal is converted into ultrasonic wave and exports extraneous ultrasound transducer array 13 to.Wherein, The 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; Include a plurality of digital power amplifiers 120 in the power amplifier device 12; In the present embodiment, adopt the higher D class digital power amplifier of conversion efficiency.
(Pulse Density Modulation PDM) is the single-bit stream that general digital signal is converted into two-forty through over-sampling and high-order noise shaping algorithm to pulse density modulated.Among the present invention; Through digital carrier signal is carried out pulse density modulated; Just can obtain possessing the signal that can decompose with multi-direction adjustment function; Amplify again successively through grouping and direction adjustment unit 112 and 113 processing of multi-direction pulse signal superpositing unit, and through D class digital power amplifying device, send ultrasonic by many groups ultrasonic transducer battle array to a plurality of any directions at last; Just can obtain that direction can be adjusted immediately, the voice signal of a plurality of 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, converts voice signal to be modulated into digital audio and video signals s through 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 behind the 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, with the carrier wave c behind the 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 that forms
AP, then:
c
AP＝[b
1?b
2?b
3...b
n]＝PDM{c
A}；
Step S004: with the single-bit stream carrier wave c of pulse density modulated signal
APPass to and divide into groups and direction adjusting module 112, carry out signal packets earlier, promptly according to following framework matrix FRAME to signal c
APCarry out the K road and divide into groups, 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 through STEER
kThe travel direction adjustment, preset D
kBe directioin parameter, with K road signal G
kRespectively independently with directioin parameter D
kConvolution is to obtain the K road carrier wave W of direction adjustment
k
Step S006: the adjusted signal of direction is passed to multi-direction pulse signal superpositing unit 113, preset exist P direction to carry out playback, with the W of each direction correspondence
kMatrix superposes, and finally obtains the carrier wave T of K road after comprehensive
K
Wherein, W
1 1To W
k 1Matrix be the K road carrier signal W of first direction
k, W
1 PTo W
k PBe the K road carrier signal W of P direction
k
Step S007: with 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 for use, with carrier frequency f
cThe noise filtering that+20KHz is above is launched the array that filtered signal is passed to ultrasound transducer array 13 again, finally on an adjusted P direction, carries out the ultrasound non-linear demodulation, thereby reduces audio signal s.
Above-described only is execution mode of the present invention, should be pointed out that for the person of ordinary skill of the art at this, under the prerequisite that does not break away from the invention design, can also make improvement, but these all belongs to protection scope of the present invention.
Claims (10)
1. parametric acoustic array speaker system; It comprises: carrier modulation treatment device, the power amplifier device that links to each other with the carrier modulation treatment device and the ultrasound transducer array that links to each other with power amplifier device, and it is characterized in that: said carrier modulation treatment device comprises:
The carrier amplitude modulating unit is used to receive digital audio and video signals s, digital audio and video signals and carrier signal c is multiplied each other, with the carrier signal c after obtaining modulating
A
The pulse density modulated unit is used for the output signal c of reception carrier amplitude modulation unit
A, and it is carried out pulse density modulated PDM by following formula, and obtain by n single-bit carrier signal b
nThe single-bit stream carrier signal c that forms
AP,
c
AP＝[b
1?b
2?b
3...b
n]＝PDM{c
A}；
Divide into groups and the direction adjustment unit, be used 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, again will be through the STEER adjustment to G
kThe travel direction adjustment, and then obtain the adjusted signal W of direction
k,
Wherein, m is the columns of 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
kBe K group G
kThe directioin parameter of signal;
Multi-direction pulse signal superpositing unit, the adjusted signal W of receive direction
k, and it is carried out the pulse signal W that preset direction is all directions of P by following formula
kOverlap-add procedure, obtain the composite carrier signal signal T after the stack of P direction
K,
2. parametric acoustic array speaker system according to claim 1 is characterized in that: also be provided with between said power amplifier device and the ultrasound transducer array 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 filters out is greater than f
c+ 20KHz, wherein, f
cBe carrier frequency.
4. parametric acoustic array speaker system according to claim 3 is characterized in that: said low pass filter comprises 8 rank analog circuits.
5. according to any described parametric acoustic array speaker system of claim 1 to 4, it is characterized in that: said power amplifier module adopts D class digital power amplifier.
6. modulator approach based on the described parametric acoustic array speaker system of claim 1, it is characterized in that: this modulator approach comprises the steps:
Step S001: digital audio and video signals s is provided, the carrier modulation treatment that is provided with carrier wave c device is provided,, carrier wave c and digital audio and video signals s are multiplied each other, obtain the carrier wave c behind the amplitude modulation(PAM) through carrier amplitude modulation
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 behind the amplitude modulation(PAM)
ACarry out pulse density modulated, obtain by n single-bit carrier signal b
nThe single-bit stream carrier wave c that forms
AP, then:
c
AP＝[b
1?b
2?b
3...b
n]＝PDM{c
A}；
Step S003: signal packets, with the single-bit stream carrier wave c of pulse density modulated signal
APBe decomposed into K road signal G by following formula
k:
Wherein, m is this matrix column number;
Step S004: preset D
kBe directioin parameter, with K road signal G
kRespectively independently with directioin parameter D
kConvolution is to obtain the K road carrier wave W of direction adjustment
k
Step S005: preset exist P direction to carry out playback, with the W of each direction correspondence
kMatrix superposes, and finally obtains the carrier wave T of K road after comprehensive
K
Step S006: with K road carrier wave T
KLaunch through delivering to ultrasound transducer array after the power amplifier device amplification, finally the demodulation and the audio signal s that reduces on an adjusted P direction.
7. the modulator approach of parametric acoustic array speaker system according to claim 6 is characterized in that: in the said step 006, and carrier wave T
KAfter power amplifier device is handled, handle through low pass filter again 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 filters out is greater than f
c+ 20KHz, wherein, f
cBe carrier frequency.
9. the modulator approach of parametric acoustic array speaker system according to claim 8 is characterized in that: said low pass filter comprises 8 rank analog circuits.
10. according to the modulator approach of any described parametric acoustic array speaker system of claim 6 to 9, it is characterized in that: said power amplifier module is a D class digital power amplifier.
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|---|---|---|---|
| CN201110420128.XA CN102438192B (en) | 2011-12-15 | 2011-12-15 | Audio parametric array speaker system and modulation method thereof |
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|---|---|---|---|
| CN201110420128.XA CN102438192B (en) | 2011-12-15 | 2011-12-15 | Audio parametric array speaker system and modulation method thereof |
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| CN102438192B CN102438192B (en) | 2014-04-16 |
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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 |
| CN102780965A (en) * | 2012-08-09 | 2012-11-14 | 广州励丰文化科技股份有限公司 | Method for correcting stage and video professional sound system |
| CN102780964A (en) * | 2012-08-09 | 2012-11-14 | 广州励丰文化科技股份有限公司 | Method for adjusting professional loudspeaker system |
| CN102811412A (en) * | 2012-08-09 | 2012-12-05 | 广州励丰文化科技股份有限公司 | Specialized speaker system regulation method |
| 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 |
| CN107453821A (en) * | 2017-07-05 | 2017-12-08 | 厦门声戎科技有限公司 | A kind of sound concealed 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 |
| CN111818422A (en) * | 2020-07-03 | 2020-10-23 | 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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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| CN102780964A (en) * | 2012-08-09 | 2012-11-14 | 广州励丰文化科技股份有限公司 | Method for adjusting professional loudspeaker system |
| CN102811412A (en) * | 2012-08-09 | 2012-12-05 | 广州励丰文化科技股份有限公司 | Specialized speaker system regulation method |
| 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 |
| CN102780965A (en) * | 2012-08-09 | 2012-11-14 | 广州励丰文化科技股份有限公司 | Method for correcting stage and video professional sound system |
| 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 |
| CN107453821A (en) * | 2017-07-05 | 2017-12-08 | 厦门声戎科技有限公司 | A kind of sound concealed 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 |
| CN111818422A (en) * | 2020-07-03 | 2020-10-23 | 电子科技大学 | Fixed-point sound wave transmitting device based on parametric array principle |
| 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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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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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140416 Termination date: 20211215 |