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Related Concept Videos

Wave Parameters01:10

Wave Parameters

The simplest mechanical waves are associated with simple harmonic motion and repeat themselves for several cycles. These simple harmonic waves can be modeled using a combination of sine and cosine functions. Consider a simplified surface water wave that moves across the water's surface. Unlike complex ocean waves, in surface water waves, water moves vertically, oscillating up and down, whereas the disturbance of the wave moves horizontally through the medium. If a seagull is floating on the...
Propagation of Waves01:07

Propagation of Waves

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Effective Value of a Periodic Waveform01:07

Effective Value of a Periodic Waveform

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Fabrication of Surface Acoustic Wave Devices on Lithium Niobate
07:55

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Published on: June 18, 2020

Implementing wavelet inverse-transform processor with surface acoustic wave device.

Wenke Lu1, Changchun Zhu, Qinghong Liu

  • 1School of Information Science and Technology, Donghua University, Shanghai 201620, China. luwenkelu@163.com

Ultrasonics
|October 6, 2012
PubMed
Summary

This study details fabricating a compact wavelet inverse-transform processor using surface acoustic wave (SAW) devices. Researchers solved challenges with load and internal resistance, enabling practical SAW-based wavelet signal processing.

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Area of Science:

  • Signal Processing
  • Materials Science
  • Electrical Engineering

Background:

  • Wavelet transforms are crucial for signal analysis, but their hardware implementation can be complex.
  • Surface Acoustic Wave (SAW) devices offer a potential platform for compact and efficient signal processing.
  • Previous implementations faced challenges with electrode design and impedance matching.

Purpose of the Study:

  • To investigate implementation schemes for a wavelet inverse-transform processor using SAW devices.
  • To define electrode length functions based on wavelet envelopes for processor fabrication.
  • To address and solve issues related to load and internal resistance in SAW-based processors.

Main Methods:

  • Designed a linear input and output interdigital transducer (IDT) configuration where identical IDTs enable the product of their frequency responses.
  • Utilized X-112(0)Y LiTaO(3) as the substrate material for fabricating the SAW device.
  • Defined electrode length functions derived from wavelet function envelopes for precise electrode dimension calculation and IDT design.

Main Results:

  • Successfully demonstrated a fabrication scheme for a wavelet inverse-transform processor using SAW devices.
  • Achieved a compact and low-cost processor due to the linear IDT implementation.
  • Developed solutions for load and internal resistance issues by incorporating amplifiers at the input and output stages.

Conclusions:

  • The proposed implementation scheme enables the fabrication of efficient wavelet inverse-transform processors using SAW devices.
  • The use of identical input and output IDTs simplifies the realization of the required frequency response product.
  • The integration of amplifiers effectively mitigates the impact of resistance mismatches, enhancing processor performance.