CN101984555B - Parametric array audio play system - Google Patents
Parametric array audio play system Download PDFInfo
- Publication number
- CN101984555B CN101984555B CN201010538214A CN201010538214A CN101984555B CN 101984555 B CN101984555 B CN 101984555B CN 201010538214 A CN201010538214 A CN 201010538214A CN 201010538214 A CN201010538214 A CN 201010538214A CN 101984555 B CN101984555 B CN 101984555B
- Authority
- CN
- China
- Prior art keywords
- frequency
- pulse signal
- combination
- broadcast system
- parametric array
- 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
Images
Landscapes
- Circuit For Audible Band Transducer (AREA)
Abstract
The invention provides a parametric array audio play system which is used for playing preset audible tones composed of a plurality of frequencies. The parametric array audio play system comprises a receiver, a high frequency pulse signal generator, a multiway digital power amplifier and an ultrasonic transducer array, wherein the receiver is used for receiving the control signal of the amplitude of each frequency in the frequency combination; the high frequency pulse signal generator is used for generating a high frequency pulse signal at carrier frequency and a modulated high frequency pulse signal of the amplitude corresponding to each frequency in the frequency combination; the multiway digital power amplifier is used for independently amplifying high frequency pulse signals at different frequencies, which are generated by the high frequency pulse signal generator, and outputting the corresponding ultrasonic signals; and the ultrasonic transducer array is used for receiving the ultrasonic signals and generating audible tones at the frequency combination. The parametric array audio play system has the advantages of simple structure, low performance requirements for ultrasonic transducer, and the like.
Description
Technical field
The present invention relates to a kind of parametric array audio frequency broadcast system, relate in particular to a kind of parametric array audio frequency broadcast system that is used to play predefined a plurality of combination of frequencies.
Background technology
Common parametric array audio frequency broadcast system is for broadband signal designs, and can be used to play the abundant audio signal of frequency.But this type systematic needs special modulator and high-frequency wideband signal power amplifier, makes that system configuration is complicated, performance requirement is high.And, if in modulated process, use double-sideband amplitude modulation, can introduce harmonic distortion; And if the modulation of use single-sideband amplitude then needs extra signal processing.Also require the frequency response of ultrasonic transducer smooth as far as possible simultaneously.
Not needing broadband signal in some application scenarios, is the combination of a plurality of frequencies, the loud speaker that for example is used to warn or point out usefulness, perhaps toy of analog instruments etc.In this case, use common parametric array audio frequency broadcast system and seem that more system configuration is complicated and cost is higher.
Summary of the invention
Have complicated, high to the ultrasonic transducer performance requirement problem of system configuration to existing parametric array audio frequency broadcast system, the present invention provides a kind of system configuration simple, low to the performance requirement of ultrasonic transducer parametric array audio frequency broadcast system.
A kind of parametric array audio frequency broadcast system is used to play the audible sound that predefined a plurality of combination of frequency forms.This parametric array audio frequency broadcast system comprises: receiving system, high-frequency pulse signal generator, multi-path digital power amplifier and ultrasound transducer array; Wherein, The control signal of the amplitude size of each frequency in this receiving system receive frequency combination; High-frequency pulse signal after the corresponding single-sideband amplitude of each frequency is modulated in this high-frequency pulse signal generator generates carrier frequency according to this control signal high-frequency pulse signal and the combination of frequency; This multi-path digital power amplifier amplifies the high-frequency pulse signal and the corresponding ultrasonic signal of output of the different frequency of this high-frequency pulse signal generator generation independently; This ultrasound transducer array receives this ultrasonic signal, and the audible sound of generated frequency combination.
As the further improvement of above-mentioned parametric array audio frequency broadcast system, this control signal is an one-channel signal, and it comprises the amplitude size information of each frequency in this combination of frequency.
As the further improvement of above-mentioned parametric array audio frequency broadcast system, this control signal is multiple signals, and it comprises the amplitude size information of one or more frequencies respectively.
Further improvement as above-mentioned parametric array audio frequency broadcast system; This high-frequency pulse signal generator sends the high-frequency pulse signal after the corresponding single-sideband amplitude modulation of each frequency in high-frequency pulse signal and the combination of frequency of carrier frequency simultaneously, and the pulse duration of the high-frequency pulse signal in the combination of frequency behind the corresponding amplitude modulation(PAM) of each frequency is by this control signal control.
As the further improvement of above-mentioned parametric array audio frequency broadcast system, the output signal of this single-sideband amplitude modulation includes only a sideband, and the corresponding sideband of each frequency independently is upper sideband or lower sideband in the combination of frequency.
As the further improvement of above-mentioned parametric array audio frequency broadcast system, each road of this multi-path digital power amplifier receive respectively and the high-frequency pulse signal that amplifies carrier frequency respectively and this predefined a plurality of combination of frequencies in the amplitude modulation(PAM) of each frequency correspondence after high-frequency pulse signal.
Further improvement as above-mentioned parametric array audio frequency broadcast system; This ultrasound transducer array comprises the ultrasonic transducer of a plurality of different center frequency, and the centre frequency of these a plurality of ultrasonic transducers corresponds respectively to the frequency from the ultrasonic signal of this multi-path digital power amplifier output.
As the further improvement of above-mentioned parametric array audio frequency broadcast system, the same centre frequency of adjacent ultrasonic transducer is different in this ultrasound transducer array.
Parametric array audio frequency broadcast system of the present invention does not need the high-frequency pulse signal after modulator just can be exported modulation; Therefore its structure obtains simplifying; And every way word power amplifier only amplifies the some frequencies in the high-frequency pulse signal behind the amplitude modulation(PAM) of each frequency in carrier frequency and the combination of frequency, so also greatly simplification of the design of multi-path digital power amplifier.In addition, the performance requirement to ultrasonic transducer also reduces.
Description of drawings
Fig. 1 is the main schematic flow sheet of parametric array audio frequency broadcast system one preferred embodiments of the present invention.
Embodiment
Below in conjunction with accompanying drawing the present invention is elaborated.
Parametric array audio frequency broadcast system of the present invention mainly is used for playing the audible sound that predefined a plurality of combination of frequency forms, and this combination of frequency comprises one or more predefined different frequencies.This parametric array audio frequency broadcast system comprises receiving system, high-frequency pulse signal generator, multi-path digital power amplifier and ultrasound transducer array.Wherein, this receiving system is used for the control signal of the amplitude size of each frequency in the receive frequency combination.This high-frequency pulse signal generator is used to generate the high-frequency pulse signal behind the corresponding amplitude modulation(PAM) of each frequency in high-frequency pulse signal and the combination of frequency of carrier frequency.This multi-path digital power amplifier is used for amplifying independently the high-frequency pulse signal of different frequency, and it possibly comprise two-way, three tunnel or multi-path digital power amplifier more.This ultrasound transducer array is made up of the ultrasonic transducer of multiple different center frequency.Wherein, the ultrasonic transducer of same centre frequency can adjacently be arranged, and also can non-conterminously arrange, but under the situation of non-conterminous arrangement, the effect that it reached is preferable.That is to say that under the preferable situation of effect, the same centre frequency of adjacent ultrasonic transducer is different in this ultrasound transducer array.
Seeing also Fig. 1, is the groundwork schematic flow sheet of parametric array audio frequency broadcast system one preferred embodiments of the present invention.The workflow of this parametric array audio frequency broadcast system mainly comprises:
(1) definite in advance concrete combination of frequency f that expects
1, f
2..., f
N, be N frequency, wherein N＞0 altogether.Confirm the carrier frequency f of ultrasonic signal
cCalculate combination of frequency through behind the amplitude modulation(PAM), be respectively f
C1, f
C2..., f
CN, and have: f
Cn=f
c± f
n, n=1 wherein, 2 ..., N, addition or subtraction are selected in " ± " expression arbitrarily, corresponding respectively upper sideband amplitude modulation(PAM) and lower sideband amplitude modulation(PAM);
(2) combination of frequency f is set
1, f
2..., f
NIn each frequency f
nAmplitude size A
nControl signal, control signal can change at any one time; Wherein, this control signal can be independent signal, and it comprises combination of frequency f
1, f
2..., f
NIn each frequency f
nAmplitude size A
nInformation, this control signal also can be multiple signals, and it comprises the amplitude size A of one or more frequencies respectively
nInformation; That is to say, control signal needn't with combination of frequency f
1, f
2..., f
NCorresponding one by one, when control signal is one-channel signal, also can realize control;
(3) to produce 1 tunnel frequency be carrier frequency f to high-frequency pulse signal generator
c, duty ratio is 50% the first high-frequency pulse signal U
c, and according to each frequency f
nAmplitude size A
n, producing N road frequency is each frequency f in the combination of frequency
nCombination of frequency f behind the corresponding amplitude modulation(PAM)
Cn, duty ratio is d
nThe second high-frequency pulse signal U
nThat is to say that high-frequency pulse signal generator sends carrier frequency f simultaneously
cThe first high-frequency pulse signal U
cWith each frequency f in the combination of frequency
nThe second high-frequency pulse signal U behind the corresponding amplitude modulation(PAM)
n, its pulse duration is controlled by control signal;
(4) first high-frequency pulse signal U
cWith the second high-frequency pulse signal U
nPass through the multi-path digital power amplifier respectively, each the way word power amplifier in the multi-path digital power amplifier receives respectively and amplifies carrier frequency f respectively
cThe first high-frequency pulse signal U
cWith each frequency f in this combination of frequency
nThe second high-frequency pulse signal U behind the corresponding amplitude modulation(PAM)
n, export the first ultrasonic signal S then
cWith the second ultrasonic signal S
n
(5) ultrasound transducer array is respectively f by centre frequency
cOr f
CnMultiple ultrasonic transducer constitute.The first ultrasonic signal S
cWith the second ultrasonic signal S
nDeliver to the ultrasonic transducer that coincide with centre frequency respectively.Ultrasonic transducer emission ultrasonic wave is propagated in air and from demodulation, generated frequency makes up f
1, f
2..., f
NAudible sound.That is to say that the ultrasonic transducer of this multiple different center frequency corresponds respectively to carrier frequency f
cWith each frequency f in the combination of frequency
nCombination of frequency f behind the corresponding amplitude modulation(PAM)
Cn
Understand the present invention for ease, the degree of amplitude modulation size with single-frequency is that 1kHz and 5kHz are example explanation the present invention below, and wherein carrier frequency is chosen as 25kHz.
The 1kHz single-frequency is behind amplitude modulation(PAM) in theory, and the double-sideband signal of generation is 24kHz and 26kHz.Here only retain sideband, confirm that promptly the output signal is the result of 24kHz as the lower sideband amplitude modulation(PAM).
The 5kHz single-frequency is behind amplitude modulation(PAM) in theory, and the double-sideband signal of generation is 20kHz and 30kHz.Here only keep upper sideband, confirm that promptly the output signal is the result of 30kHz as the upper sideband amplitude modulation(PAM).
Designing high-frequency pulse signal generator thus, export three road signals simultaneously, is respectively 24kHz, 25kHz and 30kHz.Design three way word power amplifiers, the effective frequency of amplification is respectively 24kHz, 25kHz and 30kHz.
Corresponding, select three kinds of ultrasonic transducers, its centre frequency is respectively 24kHz, 25kHz and 30kHz.12 every type, have 36 ultrasonic transducers altogether, constitute the square array of 6x 6.Wherein, the centre frequency of adjacent ultrasonic transducer is different.
Input unit is two knobs, the relative size when controlling 1kHz and 5kHz broadcast respectively.The level of two corresponding two variations of knob is connected to signal generator, the pulse duration of control 24kHz and 30kHz.The pulse duration of 25kHz is always 50% duty ratio.
This parametric array audio frequency broadcast system does not need the high-frequency pulse signal after modulator just can be exported modulation, so its structure obtains simplifying.Secondly, owing to every way word power amplifier only amplifies single-frequency, so the design of this multi-path digital power amplifier is also greatly simplified.Wherein, single-frequency is carrier frequency f
cWith combination of frequency f
1, f
2..., f
NInterior each frequency f
nAmplitude modulation(PAM) after combination of frequency f
CnIn some frequencies.In addition, the frequency after the centre frequency that only needs ultrasonic transducer and the modulation is consistent, does not need flat frequency to respond, so the performance requirement of ultrasonic transducer is also reduced.
In sum, parametric array audio frequency broadcast system of the present invention have simple in structure, to advantage such as the performance requirement of ultrasonic transducer is low.
More than be merely preferred case study on implementation of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. parametric array audio frequency broadcast system; Be used to play the audible sound that predefined a plurality of combination of frequency forms; It is characterized in that; This parametric array audio frequency broadcast system comprises: receiving system, high-frequency pulse signal generator, multi-path digital power amplifier and ultrasound transducer array, wherein, the control signal of the amplitude size of each frequency in this receiving system receive frequency combination; High-frequency pulse signal after the corresponding single-sideband amplitude of each frequency is modulated in this high-frequency pulse signal generator generates carrier frequency according to this control signal high-frequency pulse signal and the combination of frequency; This multi-path digital power amplifier amplifies the high-frequency pulse signal and the corresponding ultrasonic signal of output of the different frequency that this high-frequency pulse signal generator generates independently, and this ultrasound transducer array receives this ultrasonic signal, and the audible sound of generated frequency combination.
2. parametric array audio frequency broadcast system according to claim 1 is characterized in that this control signal is an one-channel signal, and it comprises the amplitude size information of each frequency in this combination of frequency.
3. parametric array audio frequency broadcast system according to claim 1 is characterized in that this control signal is multiple signals, and it comprises the amplitude size information of one or more frequencies respectively.
4. parametric array audio frequency broadcast system according to claim 1; It is characterized in that; This high-frequency pulse signal generator sends the high-frequency pulse signal after the corresponding single-sideband amplitude modulation of each frequency in high-frequency pulse signal and the combination of frequency of carrier frequency simultaneously, and the pulse duration of the high-frequency pulse signal in the combination of frequency behind the corresponding amplitude modulation(PAM) of each frequency is by this control signal control.
5. parametric array audio frequency broadcast system according to claim 4 is characterized in that, the output signal of this single-sideband amplitude modulation includes only a sideband, and the corresponding sideband of each frequency independently is upper sideband or lower sideband in the combination of frequency.
6. parametric array audio frequency broadcast system according to claim 1; It is characterized in that, each road of this multi-path digital power amplifier receive respectively and the high-frequency pulse signal that amplifies carrier frequency respectively and this predefined a plurality of combination of frequencies in the amplitude modulation(PAM) of each frequency correspondence after high-frequency pulse signal.
7. parametric array audio frequency broadcast system according to claim 6; It is characterized in that; This ultrasound transducer array comprises the ultrasonic transducer of a plurality of different center frequency, and the centre frequency of these a plurality of ultrasonic transducers corresponds respectively to the frequency from the ultrasonic signal of this multi-path digital power amplifier output.
8. parametric array audio frequency broadcast system according to claim 7 is characterized in that the same centre frequency of adjacent ultrasonic transducer is different in this ultrasound transducer array.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010538214A CN101984555B (en) | 2010-11-10 | 2010-11-10 | Parametric array audio play system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010538214A CN101984555B (en) | 2010-11-10 | 2010-11-10 | Parametric array audio play system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101984555A CN101984555A (en) | 2011-03-09 |
| CN101984555B true CN101984555B (en) | 2012-09-12 |
Family
ID=43641726
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010538214A Expired - Fee Related CN101984555B (en) | 2010-11-10 | 2010-11-10 | Parametric array audio play system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101984555B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104688192B (en) * | 2015-03-31 | 2017-06-06 | 西安交通大学 | Audio sound source based on difference frequency ultrasound is produced and air flue characteristic test method and system |
| CN112198515B (en) | 2020-10-13 | 2021-06-29 | 湖南国天电子科技有限公司 | Parametric array shallow-section difference frequency conversion performance optimization method |
-
2010
- 2010-11-10 CN CN201010538214A patent/CN101984555B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN101984555A (en) | 2011-03-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Pompei | The use of airborne ultrasonics for generating audible sound beams | |
| US9002032B2 (en) | Parametric signal processing systems and methods | |
| JP6274497B2 (en) | Parametric speaker | |
| CN101790118A (en) | Audio-frequency directional loudspeaker system and signal processing method thereof | |
| US10129657B2 (en) | Unidirectional loudspeaker enclosure | |
| JP2007235930A5 (en) | ||
| GB2511441A (en) | Electronically orbited speaker system | |
| CN204031425U (en) | Active directional loudspeaker | |
| JP3252803B2 (en) | Super directional speaker device | |
| JP2007267368A (en) | Speaker device, sound reproducing method, and speaker control device | |
| CN101453679A (en) | Parametric array loudspeaker, signal processing method thereof | |
| JP6333480B1 (en) | Super directional acoustic device | |
| CN102172043A (en) | Acoustic reproduction device | |
| CN101984555B (en) | Parametric array audio play system | |
| CN103338421A (en) | Method and device for carrying out area sound transmission by adopting acoustic frequency array | |
| JP2002315088A (en) | Parametric loudspeaker system based on ultrasound | |
| JP2002354575A (en) | Parametric multiway speaker system based on ultrasonic wave | |
| US20030039370A1 (en) | Method and apparatus for eliminating audio feedback | |
| JP2007228402A (en) | Super-directional sound device | |
| JP2008113194A (en) | Ultrasonic element and ultra-directional speaker | |
| CN203368720U (en) | Directive sound source system | |
| US6466674B1 (en) | Method and apparatus for eliminating audio feedback | |
| CN217063990U (en) | Audio frequency amplitude modulation circuit and ultrasonic directional sound box | |
| Olszewski et al. | Highly directional multi-beam audio loudspeaker | |
| JP7336803B2 (en) | PARAMETRIC SPEAKER AND SOUND SIGNAL OUTPUT METHOD |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170421 Address after: Singapore Ang Mo Kio 65 Street No. 10 techpoint Building 1 floor, No. 8 Co-patentee after: AAC Acoustic Technologies (Changzhou) Co.,Ltd. Patentee after: AAC TECHNOLOGIES Pte. Ltd. Address before: 518057 Nanshan District province high tech Industrial Park, Shenzhen, North West New Road, No. 18 Co-patentee before: AAC Acoustic Technologies (Changzhou) Co.,Ltd. Patentee before: AAC ACOUSTIC TECHNOLOGIES (SHENZHEN) Co.,Ltd. |
|
| TR01 | Transfer of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120912 Termination date: 20211110 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |