CN105120402A - Directional audio frequency exciting system - Google Patents
Directional audio frequency exciting system Download PDFInfo
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- CN105120402A CN105120402A CN201510520344.XA CN201510520344A CN105120402A CN 105120402 A CN105120402 A CN 105120402A CN 201510520344 A CN201510520344 A CN 201510520344A CN 105120402 A CN105120402 A CN 105120402A
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Abstract
The invention discloses a directional audio frequency exciting system, comprising a signal pre-treatment device used for generating corresponding audio signals according to the vibration frequency, vibration magnitude, vibration time and vibration type set by a user; a low pass filter connected to the output terminal of the signal pre-treatment device, and used for filtering audio signals outputted by the signal pre-treatment device to filter audio signal components out of a vibration frequency scope; an AD converter connected to the output terminal of the low pass filter, and used for converting simulation audio signals outputted by the low pass filter into digital signals; a signal post-treatment device connected to the output terminal of the AD converter, and used for performing ultrasonic modulation on the digital signals outputted by the AD converter; and a DA converter, a power amplifier, a signal reconstruction filter and an energy transducer set. The directional audio frequency exciting system can realize non-contact excitation in a 0Hz-20kHz frequency range, and has a wider range of application.
Description
Technical field
The invention belongs to vibrating device technical field, be specifically related to a kind of excitation system of directed audio frequency, be applied to the vibration tests such as automotive electronics, Aero-Space, weaponry, MEMS (micro electro mechanical system).
Background technology
At present, the structure of excitational equipment mainly vibration machine and vibration generator is vibrated.Usually, vibration generator is mounted in direct excited vibration on testee, thus produces a perturbed force and act on tested works; And vibration machine is that testee is contained on shaking platform, vibration machine produces the vibration displacement of a change, thus on testee, produces a carrier inertial force corresponding with the vibration displacement of vibration machine and exciting.From principle point, excitational equipment can be divided into the various ways such as mechanical type, electromagnetic type, fluid pressure type and piezoelectric type.Due to the restriction in principle, traditional excitational equipment generally can only realize the exciting in about 0Hz-4kHz frequency band range, and excited frequency scope is very limited, and realizes the excitation to test specimen under the condition that must contact with test specimen at excitational equipment.
Summary of the invention
The object of the invention is to: the excitation system providing a kind of directed audio frequency, can realize the non-contact exciting in 0Hz-20kHz frequency range, range of application is wider.
To achieve these goals, the technical solution used in the present invention is:
An excitation system for directed audio frequency, comprising:
Signal pretreating device, produces corresponding audio signal for vibration frequency, vibration level, time of vibration and the oscillatory type set according to user;
Low pass filter, is connected with the output of signal pretreating device, carries out filtering process, the audio signal component outside filtering vibration frequency range for the audio signal exported by signal pretreating device;
AD converter, is connected with low pass filter output, is converted to digital signal for the simulated audio signal exported by low pass filter;
Signal post-processing device, is connected with the output of AD converter, carries out ultrasonic modulation for digital signal AD converter exported;
DA converter, is connected with the output of signal post-processing device, is converted to analog signal for ultrasonic digital signal signal post-processing device modulates gone out;
Power amplifier, is connected with D/A converter output, amplifies for analog signal D/A converter exported;
Signal reconstruction filter, is connected with power amplifier, causes the rough high frequency signal components of signal for filtering from the analog signal that power amplifier exports;
Transducer group, is connected with signal reconstruction filter, is converted to acoustical signal for the signal of telecommunication exported by signal reconstruction filter, and exports the high directivity ultrasonic signal containing audio signal modulation.
Preferably, described signal pretreating device is formed primarily of single-chip microcomputer, signal processing chip DSP or Programmadle logic gate array FPGA.
Preferably, described signal post-processing device is formed primarily of signal processing chip DSP or Programmadle logic gate array FPGA.
Preferably, described power amplifier is category-A, category-B or AB analoglike power-like amplifier, or D class, E class or T class numeric class power amplifier.
Preferably, described transducer group comprises low-frequency transducer group, mid frequency transducer group and high-frequency transducer group three class, every class transducer group adopts the transducer of several frequency bands to combine, and the transducer of identical frequency band has at least a transducer to carry out signal output.
Preferably, the frequency band range of described low-frequency transducer group is at 0Hz-500Hz, and the frequency band range of mid frequency transducer group is at 500Hz-4kHz, and the frequency band range of high-frequency transducer group is at 4kHz-20kHz.
Owing to have employed technique scheme, the invention has the beneficial effects as follows:
The excitation system of a kind of directed audio frequency of the present invention, utilize ultrasonic wave high directivity feature and its nonlinear propagation in atmosphere, certainly demodulate the principle of high directivity audible sound, sound wave can cause object vibration in addition, thus realize can excited frequency up to the contactless excitation system of 20kHz
Accompanying drawing explanation
Fig. 1 is excitation system theory diagram of the present invention
Fig. 2 is transducer group arrangement sketch of the present invention.
Fig. 3 is excitation system operation principle flow chart of the present invention.
Mark in figure: 1-signal pretreating device, 2-low pass filter, 3-AD transducer, 4-signal post-processing device, 5-DA transducer, 6-power amplifier, 7-signal reconstruction filter, 8-transducer group, 81-low-frequency transducer group, 82-mid frequency transducer group, 83-high-frequency transducer group.
Embodiment
With reference to Fig. 1, Fig. 2, the excitation system of a kind of directed audio frequency of the present invention, can be applicable to multiple exciting environment, as the exciting to MEMS, the high-frequency excitation etc. to air environment.Comprise:
Signal pretreating device 1, produces corresponding audio signal for vibration frequency, vibration level, time of vibration and the oscillatory type set according to user.Signal pretreating device 1 as with external first device alternately, its task is that vibration frequency, vibration level, time of vibration and the oscillatory type according to user's setting produces corresponding audio signal.Signal pretreating device 1 can by single-chip microcomputer, and signal processing chip DSP or Programmadle logic gate array FPGA are formed.
Low pass filter 2, is connected with the output of signal pretreating device 1, carries out filtering process, the audio signal component outside filtering vibration frequency range for the audio signal exported by signal pretreating device 1;
AD converter 3, is connected with low pass filter 2 output, is converted to digital signal for the simulated audio signal exported by low pass filter 2;
Signal post-processing device 4, is connected with the output of AD converter 3, carries out ultrasonic modulation for digital signal AD converter 3 exported; Signal post-processing system 4 can be made up of signal processing chip DSP and Programmadle logic gate array FPGA.
DA converter, is connected with the output of signal post-processing device 4, is converted to analog signal for the ultrasonic digital signal modulated by signal post-processing device 4;
Power amplifier 6, is connected with D/A converter 5 output, amplifies for analog signal D/A converter 5 exported; Power amplifier 66 can be simulation power-like amplifier, and comprise category-A, category-B, AB class etc., also can be numeric class power amplifiers, comprise D class, E class and T class etc.
Signal reconstruction filter 7, is connected with power amplifier 6, causes the rough high frequency signal components of signal for filtering from the analog signal that power amplifier 6 exports;
Transducer group 8, is connected with signal reconstruction filter 7, is converted to acoustical signal for the signal of telecommunication exported by signal reconstruction filter 7, and exports the high directivity ultrasonic signal containing audio signal modulation.Transducer group 8 comprises low-frequency transducer group 8, mid frequency transducer group 82 and high-frequency transducer group 83 3 class, and every class transducer group 8 adopts the transducer of several frequency bands to combine, and the transducer of identical frequency band has at least a transducer to carry out signal output.Wherein, the frequency band range of low-frequency transducer group 8 is at 0Hz-500Hz, and the frequency band range of mid frequency transducer group 82 is at 500Hz-4kHz, and the frequency band range of high-frequency transducer group 83 is at 4kHz-20kHz.Transducer group 8 can be arranged in one plane, also can adopt spatial arrangement mode.
With reference to Fig. 3, a typical workflow of the present invention, according to the test demand of user, comprising: vibration frequency, vibration level, time of vibration and oscillatory type, produce corresponding audio signal by signal pretreating device 1.Then respectively filtering and AD conversion are carried out to it by low pass filter 2 and AD converter 3.Be not divide at equal intervals when carrying out frequency band division and compensating, but thinner when dividing closeer, high frequency when low frequency.Typically be divided into 0Hz-500Hz as one, 500Hz-4kHz, 4kHz-20kHz, the former adopts lowpass digital filter to leach, and the latter two adopt bandpass digital filter to leach.Frequency compensation will be carried out respectively to these ready-portioned frequency bands after having divided frequency band.Its implementation adopts Parks-McClellan optimization equiripple FIR filters method for designing to design one respectively for each frequency band to have the corresponding FIR filter of-12dB/ octave frequency, then allow these band signals by these filters respectively, thus realize the frequency domain compensation of each band signal.Signal after the corresponding compensation of frequency, through signal post-processing device 4, i.e. ultrasonic modulator, carries out ultrasonic modulation process respectively and is converted in ultrasonic range from audiorange.Then, through D/A converter 5, power amplifier 6, signal reconstruction filter 7, after conversion process, sound signal is exported by transducer group 8.Last time of vibration parameter set by user, judges whether vibration completes, if complete, terminates whole workflow, if do not terminate, is back to and produces respective audio signal link.
Claims (6)
1. an excitation system for directed audio frequency, is characterized in that, comprising:
Signal pretreating device (1), produces corresponding audio signal for vibration frequency, vibration level, time of vibration and the oscillatory type set according to user;
Low pass filter (2), is connected with the output of signal pretreating device (1), carries out filtering process, the audio signal component outside filtering vibration frequency range for the audio signal exported by signal pretreating device (1);
AD converter (3), is connected with low pass filter (2) output, is converted to digital signal for the simulated audio signal exported by low pass filter (2);
Signal post-processing device (4), is connected with the output of AD converter (3), carries out ultrasonic modulation for digital signal AD converter (3) exported;
DA converter, is connected with the output of signal post-processing device (4), is converted to analog signal for the ultrasonic digital signal modulated by signal post-processing device (4);
Power amplifier (6), is connected with D/A converter (5) output, amplifies for analog signal D/A converter (5) exported;
Signal reconstruction filter (7), is connected with power amplifier (6), causes the rough high frequency signal components of signal for filtering from the analog signal that power amplifier (6) exports;
Transducer group (8), is connected with signal reconstruction filter (7), is converted to acoustical signal for the signal of telecommunication exported by signal reconstruction filter (7), and exports the high directivity ultrasonic signal containing audio signal modulation.
2. the excitation system of directed audio frequency according to claim 1, is characterized in that, described signal pretreating device (1) is formed primarily of single-chip microcomputer, signal processing chip DSP or Programmadle logic gate array FPGA.
3. the excitation system of directed audio frequency according to claim 1, is characterized in that, described signal post-processing device (4) is formed primarily of signal processing chip DSP or Programmadle logic gate array FPGA.
4. the excitation system of directed audio frequency according to claim 1, is characterized in that, described power amplifier (6) is category-A, category-B or AB analoglike power-like amplifier, or D class, E class or T class numeric class power amplifier.
5. the excitation system of directed audio frequency according to claim 1, it is characterized in that, described transducer group (8) comprises low-frequency transducer group (81), mid frequency transducer group (82) and high-frequency transducer group (83) three class, every class transducer group (8) adopts the transducer of several frequency bands to combine, and the transducer of identical frequency band has at least a transducer to carry out signal output.
6. the excitation system of directed audio frequency according to claim 5, it is characterized in that, the frequency band range of described low-frequency transducer group (81) is at 0Hz-500Hz, the frequency band range of mid frequency transducer group (82) is at 500Hz-4kHz, and the frequency band range of high-frequency transducer group (83) is at 4kHz-20kHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510520344.XA CN105120402A (en) | 2015-08-21 | 2015-08-21 | Directional audio frequency exciting system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510520344.XA CN105120402A (en) | 2015-08-21 | 2015-08-21 | Directional audio frequency exciting system |
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| CN105120402A true CN105120402A (en) | 2015-12-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106898343A (en) * | 2017-01-23 | 2017-06-27 | 南京大学 | The device that can realize low frequency directivity manipulation for propagating 0 rank plane sound wave |
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| US6167759B1 (en) * | 1997-11-14 | 2001-01-02 | Colorado Seminary | Ultrasonic system for grading meat |
| CN101014209A (en) * | 2007-01-19 | 2007-08-08 | 电子科技大学 | Full band natural sound effect audio directional loudspeaker |
| CN101111096A (en) * | 2007-07-12 | 2008-01-23 | 电子科技大学 | Combined sound frequency orienting ultrasound wave loud-speaker system |
| CN201522365U (en) * | 2009-11-16 | 2010-07-07 | 重庆理工大学 | Non-contact sound-pressure excitation device |
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2015
- 2015-08-21 CN CN201510520344.XA patent/CN105120402A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6167759B1 (en) * | 1997-11-14 | 2001-01-02 | Colorado Seminary | Ultrasonic system for grading meat |
| CN101014209A (en) * | 2007-01-19 | 2007-08-08 | 电子科技大学 | Full band natural sound effect audio directional loudspeaker |
| CN101111096A (en) * | 2007-07-12 | 2008-01-23 | 电子科技大学 | Combined sound frequency orienting ultrasound wave loud-speaker system |
| CN201522365U (en) * | 2009-11-16 | 2010-07-07 | 重庆理工大学 | Non-contact sound-pressure excitation device |
Non-Patent Citations (1)
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| 周月琴: "超声波远距离振动信号检测系统的设计", 《机械科学与技术》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106898343A (en) * | 2017-01-23 | 2017-06-27 | 南京大学 | The device that can realize low frequency directivity manipulation for propagating 0 rank plane sound wave |
| CN106898343B (en) * | 2017-01-23 | 2020-12-15 | 南京大学 | Device capable of realizing low-frequency directional control for transmitting 0-order plane sound wave |
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Application publication date: 20151202 |