Doppler sound processing method and device

A sound processing and Doppler technology, which is applied in the direction of sound wave diagnosis, infrasonic wave diagnosis, ultrasonic/sonic wave/infrasonic wave diagnosis, etc., can solve the problems of low sampling rate, low playback frequency, metallic sound of sound signal, etc., and achieve the elimination of sound aliasing Phenomenon, the effect of simple realization method

Inactive Publication Date: 2014-03-26
SHENZHEN LANDWIND IND
View PDF4 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the measured blood flow velocity is greater than V scale When , according to the Nyquist sampling theorem, the spectrogram will generate aliasing, and the positive and negative spectrograms may alias to opposite directions respectively. Similarly, the sound of positive and negative blo

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Doppler sound processing method and device
  • Doppler sound processing method and device
  • Doppler sound processing method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0027] The present invention will be described in further detail below according to accompanying drawing and embodiment:

[0028] The present invention is based on Chinese patent application CN101856242, and provides a Doppler sound processing method and device.

[0029] Such as figure 1 As shown, when the ultrasonic imaging system performs Doppler imaging, the Doppler signal is denoised and filtered to obtain an orthogonal Doppler signal: with a fixed pulse repetition frequency or a fixed sampling rate (both denoted as PRF max ) to perform Doppler imaging and obtain quadrature Doppler signals, and the fixed pulse repetition frequency or fixed sampling rate is greater than the current user-set flow velocity level V scale Calculated theoretical pulse repetition frequency or theoretical sampling rate (collectively referred to as PRF). Then, perform sound processing on the quadrature Doppler signal obtained above and play: PRF max The orthogonal Doppler signal obtained by tran...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a Doppler sound processing method and device. The method comprises the steps of conducting Doppler imaging with a fixed pulse repetition frequency or a fixed sampling rate and acquiring orthogonal Doppler signals when a user sets a speed stage Vscale for Doppler imaging, wherein the fixed pulse repetition frequency or the fixed sampling rate is larger than a theoretical pulse repetition frequency or a theoretical sampling rate calculated according to the speed stage Vscale; conducting sound processing on the acquired orthogonal Doppler signals and playing the processed signals. Due to the fact that the pulse repetition frequency or the sampling rate is larger than the pulse repetition frequency corresponding to a flow rate gear selected by the user, sound aliasing caused by an over-low PRF is avoided during Doppler sound processing; meanwhile, when the PRF is low, due to the fact that the sound playing sampling rate is PRFmax instead of the PRF, metal sound can not occur from played signals. The Doppler sound processing method and device are easy to realize.

Description

technical field [0001] The invention relates to a Doppler sound processing technology, in particular to a method that can avoid the aliasing of the left and right channel sounds caused by spectrum aliasing, and can also eliminate the low-pitched metal that appears in the sound playback at a lower pulse repetition frequency. Acoustic Doppler sound processing method and device. Background technique [0002] As an important technology in ultrasonic diagnostic system, Doppler technology is often used in the quantitative detection of blood flow or moving tissue in the human body. When performing Doppler detection, the ultrasonic probe performs quadrature demodulation and low-pass filtering on the received human body echo signals to obtain orthogonal I and Q signals, and then performs two-way processing on the IQ signals at the same time. Spectrum calculation is performed to generate a spectrogram for display; the other channel performs noise reduction and direction separation on...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): A61B8/00
Inventor 张羽张官喜齐敏超
Owner SHENZHEN LANDWIND IND
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap