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Digital signal processing method for ultrasonic signals

A technology of ultrasonic signal and digital processing, applied in the direction of analog-to-digital converters, complex mathematical operations, etc., can solve the problems of unautomated design, inconvenient configuration, and insufficient identification of defect features, etc., and achieve high flexibility , extract the effect of easy

Inactive Publication Date: 2008-08-13
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0004] In order to solve the problem that the anti-aliasing filter design in the above background technology cannot be changed after it is implemented, and it cannot adapt to different types of ultrasonic applications; the programmable logic device cannot be modified in real time, the configuration is inconvenient, the design cannot be automated, and the identification of defect characteristics is insufficient, etc. Problem, the present invention will propose a kind of integrated digital signal processing (DSP) method to ultrasonic signal

Method used

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  • Digital signal processing method for ultrasonic signals
  • Digital signal processing method for ultrasonic signals
  • Digital signal processing method for ultrasonic signals

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Embodiment

[0020] Example: such as image 3 Figure 4 Shown include time gain compensation circuit, A / D converter, digital signal processing circuit, computer.

[0021] The time gain compensation circuit includes: a programmable logic device, a DA converter, and a programmable gain amplifier. The programmable logic device adopts CPLD programmable logic device; the DA converter adopts MAX5110 high-speed DA converter; the programmable gain amplifier adopts AD604 programmable gain amplifier. The time gain compensation circuit is realized by CPLD controlling the programmable gain amplifier through the high-speed DA converter.

[0022] A / D converter: 40Mhz / 60Mhz A / D converter can be used, such as: MAX1183.

[0023] Digital signal processing circuit: adopt TI's DSP development board: TMS320C6701EVM, the structure is shown in Figure 5.

[0024] The computer analysis software adopts Labwindows / CVI virtual instrument development system of National Instruments.

[0025] In the present inventi...

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Abstract

The invention relates to a method for using digital signal to process hypersonic signal. It synthesizes the hypersonic image and dose association time-frequency analysis and character extraction by changing the filter wave, the Hilbert changing and the quadrature modulation processing of the digital hypersonic signal. The integer digital signal processing frame can real time analyze the radiofrequency signal, the analytic signal and the quadrature modulation signal. It is as the software platform of the virtual instrument, the Labwindows / CVI is used to construct the upper layer measuring and controlling component based on the computer.

Description

Technical field: [0001] The invention belongs to the ultrasonic signal processing technology, and relates to a method for utilizing digital signal processing (DSP) ultrasonic signals. Background technique: [0002] figure 1 Traditional model for ultrasonic signal processing. Because the sampling speed of the AD converter is low, an anti-aliasing filter must be added in front of the AD converter. Usually the design of this anti-aliasing filter is very cumbersome, its circuit occupies a considerable area on the printed circuit board, and the design cannot be changed after implementation to adapt to different types of ultrasound applications. Fourier transform is used for feature extraction and noise attenuation. [0003] figure 2 It is an improved model currently used by people. Although the sampling speed of the AD converter is high, in order to improve the signal-to-noise ratio and reduce the complexity of the anti-aliasing filter design, an oversampling rate of 4 time...

Claims

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Application Information

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IPC IPC(8): G06F17/14H03M1/12
Inventor 肖影吕增明郑立男
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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