CN104182708B - Hybrid weighting type surface acoustic wave single-scale wavelet transform processor - Google Patents
Hybrid weighting type surface acoustic wave single-scale wavelet transform processor Download PDFInfo
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- CN104182708B CN104182708B CN201410391797.2A CN201410391797A CN104182708B CN 104182708 B CN104182708 B CN 104182708B CN 201410391797 A CN201410391797 A CN 201410391797A CN 104182708 B CN104182708 B CN 104182708B
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Abstract
The invention discloses a hybrid weighting type surface acoustic wave single-scale wavelet transform processor, which is characterized by comprising a piezoelectric substrate, wherein one end of the piezoelectric substrate is provided with an input energy converter; the other end of the piezoelectric substrate is provided with an output energy converter; and after an electric signal is added to the input energy converter to carry out wavelet transform, the input energy converter outputs a surface acoustic wave wavelet transform signal to the output energy converter and finally outputs an electric signal wavelet transform signal, wherein the input energy converter adopts two weighting modes: wavelet function envelope amplitude weighting and envelope weighting. The hybrid weighting type surface acoustic wave single-scale wavelet transform processor has a diffraction restriction function, is simple in design and is suitable for fields, such as radars, communication, military ships, sensors and the like.
Description
Technical field
The present invention relates to a kind of mixed weighting type surface acoustic wave type single scale wavelet transform processor, belongs to surface acoustic wave type
Wavelet transform processor technical field.
Background technology
Wavelet analysis technology has pushed a new epoch to information industry.The algorithm of wavelet analysises is complicated, its algorithm fortune
It is mostly at present what is completed in a computer to calculate, thus programing work amount is big；Also some research and utilization hardware realize
At wavelet transformation, such as super large-scale integration (Very Large Scale Integration, abbreviation VLSI), digital signal
Reason (Digital Signal Processing, abbreviation DSP), SAW device etc..Wavelet transformation is realized with VLSI and DSP
Method open the beginning that wavelet transformation is realized with hardware.Recent years realizes wavelet transform processor with VLSI and DSP
Jing has certain progress.VLSI formulas wavelet transform processor also occurs in that some special chips (such as ADV202, ADV611).
DSP formula wavelet transform processors are widely used.VLSI and DSP serve enthusiasm in terms of wavelet transformation is realized
Effect, also solves many practical problems, but VLSI and DSP are all based on digital method, and its algorithm complex and difficulty are all very
Height, and price is relatively expensive.Therefore, scientist and engineers and technicians are striving to find a kind of simplicity, price
Cheap new method carries out wavelet transformation, it is intended to avoid algorithm, the loaded down with trivial details programming of complexity, and wishes wavelet transformation to be fabricated to
Device.Under in light of this situation, it is proposed that realize the method (belonging to simulation realizing method) of wavelet transformation with SAW device,
So as to produce surface acoustic wave type wavelet transform processor.
At present the input transducer of the surface acoustic wave type wavelet transform processor in existing document is mostly shown in Fig. 1
Interdigital transducer, its finger envelope weights (the i.e. finger length of interdigital transducer according to Morlet dyadic wavelets function envelope
It is directly proportional to Morlet dyadic wavelet function envelope amplitudes), commonly referred to envelope card weighting.When sound aperture is smaller, the envelope
There are Diffraction Problems in weighting.
When sound aperture R is big (R >=λ or R/ λ >=1, λ is surface acoustic wave wavelength, such as Tu1Zhong A areas), Diffraction Problems can be neglected
Slightly, its finger envelope is designed according to the weighting of Morlet dyadic wavelets function envelope.Sound aperture R hours (i.e. R ＜ λ or R/ λ ＜ 1, such as
B1 and B2 areas in Fig. 1), there are serious Diffraction Problems.
In order to solve Diffraction Problems, the input transducer of surface acoustic wave type wavelet transform processor is also adopted by existing document
The interdigital transducer of finger Area-weighted, but the interdigital transducer design of finger Area-weighted is complicated.
The content of the invention
The technical problem to be solved in the present invention is：There is provided a kind of with the function of suppressing diffraction and design simply mixing
Weighting type surface acoustic wave type single scale wavelet transform processor, solves traditional surface acoustic wave type wavelet transform processor presence and spreads out
The problem penetrated, and input transducer is using the complicated problem of the interdigital transducer design of finger Area-weighted.
In order to solve above-mentioned technical problem, the technical scheme is that there is provided a kind of mixed weighting type surface acoustic wave type
Single scale wavelet transform processor, it is characterised in that including piezoelectric substrate, one end of piezoelectric substrate is provided with input transducer, pressure
The other end of electric substrate is provided with output transducer, and the signal of telecommunication is added in input transducer and carries out after wavelet transformation, is input into transducer
Output surface acoustic wave formula wavelet transform signal enters output transducer, finally exports signal of telecommunication formula wavelet transform signal, described
Input transducer adopts two kinds of weighting schemes：Wavelet function envelope range value weighted sum envelope card weighting.
Preferably, described input transducer is divided into the negligible region of diffraction and diffraction critical regions, diffraction
Phenomenon critical regions include right side diffraction critical regions and left side diffraction critical regions.
Preferably, the finger envelope in the negligible region of described diffraction is added using Morlet dyadic wavelet function envelopes
Power, i.e., finger length is directly proportional to the envelope range value of Morlet dyadic wavelet functions.
Preferably, the finger width of described diffraction critical regions adopts the envelope width of Morlet dyadic wavelet functions
Value weighting, i.e., finger width is directly proportional to the envelope range value of Morlet dyadic wavelet functions.Preferably, described output transducer
For the equal overlap of finger, the interdigital transducer of uniform period.
The sound aperture of present invention input transducer is in the negligible region of diffraction with wavelet function envelope variation；Diffraction shows
As critical regions sound aperture it is constant, and sound aperture enough big (take here sound aperture more than or equal to surface acoustic wave wavelength).
To reduce the diffraction of diffraction critical regions, the finger width in the region and the envelope range value of Morlet dyadic wavelet functions into
Direct ratio.Thus the present invention has the function and the simple characteristic of design for suppressing diffraction, it is adaptable to radar, communication, ships used for military purposes, biography
The fields such as sensor.
Description of the drawings
Fig. 1 is the interdigital transducer that finger envelope presses wavelet function envelope card weighting；
Fig. 2 is a kind of structural representation of mixed weighting type surface acoustic wave type single scale wavelet transform processor；
Fig. 3 (a) is the schematic diagram of wavelet function and wavelet function envelope；
Fig. 3 (b) is the schematic diagram of the envelope range value of the envelope and wavelet function of wavelet function；
Fig. 3 (c) is the schematic diagram of the finger that mixed weighting type is input into transducer；
Fig. 3 (d) is the schematic diagram that mixed weighting type is input into transducer.
Wherein：1- finger envelopes；2- is input into transducer；3- output transducers；4- piezoelectric substrates；The 5- signals of telecommunication；6- telecommunications
Number formula wavelet transform signal；7- surface acoustic wave type wavelet transform signals；8-Morlet dyadic wavelet functions；9-Morlet bis- enters little
The envelope of wave function；The negligible region of A- diffractions；B1- right sides diffraction critical regions；B2- left sides diffraction is serious
Region.
Specific embodiment
With reference to specific embodiment, the present invention is expanded on further.It should be understood that these embodiments are merely to illustrate this
It is bright, rather than limit the scope of the present invention.In addition, it is to be understood that after the content for having read instruction of the present invention, this area skill
Art personnel can make various changes or modifications to the present invention, and these equivalent form of values equally fall within the application appended claims institute
The scope of restriction.
The present invention is a kind of mixed weighting type surface acoustic wave type single scale wavelet transform processor, as shown in Fig. 2 it includes
Piezoelectric substrate 4, makes input transducer 2 and output transducer 3 on piezoelectric substrate 4.That is there is input transducing one end of piezoelectric substrate 4
Device 2, the other end of piezoelectric substrate 4 has output transducer 3.The signal of telecommunication 5 is added in input transducer 2 and carries out after wavelet transformation, defeated
Enter transducer 2 and export a surface acoustic wave type wavelet transform signal 7 propagated on the surface of piezoelectric substrate 4, the surface acoustic wave
Formula wavelet transform signal 7 to output transducer 3 is propagated.When output transducer 3 receives surface acoustic wave type wavelet transform signal 7
When, it is converted into signal of telecommunication formula wavelet transform signal 6 the surface acoustic wave type wavelet transform signal 7, it is achieved thereby that small echo becomes
Change, can so produce mixed weighting type surface acoustic wave type single scale wavelet transform processor.
As illustrated in figs. 3 a-3d, transducer 2 is input into according to yardstick 2-1Morlet dyadic wavelet functions envelope design.This
Invention is simultaneously applied to two kinds of different weighting schemes be input in transducer 2, i.e. the design of input transducer 2 is divided into two
Point：A part be diffraction do not produce or can ignore the finger envelope in region (such as A areas in Fig. 3 c and Fig. 3 d) according to
Morlet dyadic wavelets function envelope weighting design (i.e. finger envelope 1 is identical with Morlet dyadic wavelets function envelope 9), that is, lead to
Often claim envelope card weighting；The finger width of another part diffraction critical regions (such as B1 in Fig. 3 c and Fig. 3 d, B2 areas) according to
The envelope range value weighting design of Morlet dyadic wavelet functions.Output transducer 3 be the equal overlap of finger, uniform period it is interdigital
Transducer.
The design principle of input transducer 2 is divided into the negligible region A of diffraction and diffraction critical regions are retouched
State.Diffraction critical regions include right side diffraction critical regions B1 and left side diffraction critical regions B2.
Wherein, L-(p+n), L-(p+n-1), L-(p+n-2)..., L-(p+2), L-(p+1), L-p, Lp, Lp+1, Lp+2..., Lp+n-2,
Lp+n-1, Lp+n, it is the envelope range value of Morlet dyadic wavelet functions；W-(p+n), W-(p+n-1), W-(p+n-2)..., W-(p+2), W-(p+1),
W-p, Wp, Wp+1, Wp+2..., Wp+n-2, Wp+n-1, Wp+n, it is the finger width for being input into transducer 2；R is sound aperture.
The negligible region of diffraction (such as A areas in Fig. 3 c and Fig. 3 d) design principle of input transducer 2：
In the A areas of Fig. 3 c and Fig. 3 d, the finger envelope for being input into transducer 2 is weighted according to Morlet dyadic wavelets function envelope
Design, i.e., finger envelope changes with the change of Morlet dyadic wavelet function envelopes, i.e. envelope card weighting, such as Fig. 3 c and Fig. 3 d
A areas, wherein-(p-1) ..., -3, -2,1,2,3 ..., p-1 is all fingers in A areas.
Diffraction critical regions (the i.e. right side diffraction critical regions B1 and left side diffraction of input transducer 2
B1, B2 area in critical regions B2, such as Fig. 3 c and Fig. 3 d) design principle：
In B1, B2 area of Fig. 3 c and Fig. 3 d, the finger width of transducer 2 is input into according to Morlet dyadic wavelet functions
Envelope range value weighting design, that is, the finger width for being input into transducer 2 is directly proportional to the envelope range value of Morlet dyadic wavelet functions,
Wherein p, p+1, p+2 ..., p+n-2, p+n-1, p+n are all fingers in B1 areas；- p ,-(p+1) ,-(p+2) ... ,-(p+n-
2) ,-(p+n-1) ,-(p+r) are all fingers in B2 areas.
So as to obtain W-(p+n)∝L-(p+n), W-(p+n-t)∝L-(p+n-1), W-(p+n-2)∝L-(p+n-2)..., W-(p+2)∝L-(p+2),
W-(p+1)∝L-(p+1), W-p∝L-p, Wp∝Lp, Wp+1∝Lp+1, Wp+2∝Lp+2..., Wp+n-2∝Lp+n-2, Wp+n-1∝Lp+n-1, Wp+n∝
Lp+n。
The diffraction of input transducer 2 of the present invention does not produce or can ignore region (such as A areas in Fig. 3 c and Fig. 3 d)
When finger envelope is designed according to the weighting of Morlet dyadic wavelets function envelope, the input sound aperture of transducer 2 enters little with Morlet bis-
The envelope variation of wave function and change, often finger width is constant；When the finger in serious B1, B2 region of the input diffraction of transducer 2
When bar width is designed according to the envelope range value weighting of Morlet dyadic wavelet functions, the sound aperture R for being input into transducer keeps constant,
And R enough big (taking R >=λ here), so as to overcome input transducer B1, the Diffraction Problems in B2 areas.Thus the mixing adds
Power type surface acoustic wave type single scale wavelet transform processor has the function of suppressing diffraction very well.
The mixed weighting type surface acoustic wave type single scale wavelet transform processor of multiple present invention is connected in parallel and can be obtained
To multiple dimensioned surface acoustic wave type wavelet transform processor.
Claims (2)
1. a kind of mixed weighting type surface acoustic wave type single scale wavelet transform processor, it is characterised in that including piezoelectric substrate
(4), one end of piezoelectric substrate (4) is provided with input transducer (2), and the other end of piezoelectric substrate (4) is provided with output transducer (3),
The signal of telecommunication (5) is added in input transducer (2) and carries out after wavelet transformation, and input transducer (2) output surface acoustic wave formula small echo becomes
Signal (7) is changed into output transducer (3), signal of telecommunication formula wavelet transform signal (6), described input transducer is finally exported
(2) using two kinds of weighting schemes：Wavelet function envelope range value weighted sum envelope card weighting, described input transducer (2) is divided into and spreading out
The negligible region of phenomenon (A) and diffraction critical regions are penetrated, diffraction critical regions include the serious area of right side diffraction
Domain (B1) and left side diffraction critical regions (B2), the finger envelope in the negligible region of described diffraction (A) is adopted
Morlet dyadic wavelets function envelope is weighted, i.e., finger length is directly proportional to the envelope range value of Morlet dyadic wavelet functions, institute
The finger width of the diffraction critical regions stated is weighted using the envelope range value of Morlet dyadic wavelet functions, i.e. finger width
It is directly proportional to the envelope range value of Morlet dyadic wavelet functions.
2. a kind of mixed weighting type surface acoustic wave type single scale wavelet transform processor as claimed in claim 1, its feature exists
In described output transducer (3) is the equal overlap of finger, the interdigital transducer of uniform period.
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| CN105117668A (en) * | 2015-07-28 | 2015-12-02 | 东华大学 | Envelope amplitude weighting type wavelet transformation processor with diffraction inhibition function |
| CN105117667A (en) * | 2015-07-28 | 2015-12-02 | 东华大学 | Surface acoustic wave type arbitrary-scale wavelet transformation processor |
| CN114611533B (en) * | 2022-01-28 | 2022-12-06 | 金陵科技学院 | Interdigital unilateral inclined weighted surface acoustic wave type Morlet wavelet processor |
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| DE10316925B4 (en) * | 2002-04-09 | 2007-10-31 | Leibniz-Institut für Festkörper- und Werkstoffforschung e.V. | Acoustic surface wave component |
| CN101699463A (en) * | 2009-11-03 | 2010-04-28 | 东华大学 | Multi-scale surface acoustic wave type wavelet transform and inverse wavelet transform processor |
| CN101834578A (en) * | 2010-05-18 | 2010-09-15 | 北京晶芯网信科技有限公司 | Block-weighted surface acoustic wave split-finger transducer |
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