Decimating filtering method and decimating filter

A technology for extracting filtering and extracting factors, which is used in blood flow measurement devices, acoustic wave diagnosis, infrasound wave diagnosis and other directions, which can solve the problems of large depth gear span, inability to meet the fine adjustment and unevenness of ultrasonic image selection ratio.

Active Publication Date: 2010-12-22
SHENZHEN MINDRAY BIO MEDICAL ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the depth adjustment is shown on the ultrasound image, the depth gear span is large ...

Method used

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  • Decimating filtering method and decimating filter

Examples

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Effect test

Embodiment 1

[0098] It may be assumed that the sampling rate of the input signal x(n) is 40MHz, and now it is necessary to reduce the sampling rate to 160 / 9MHz, and the number of accumulators is L=2, then the decimation ratio of the decimation filter is M=9 / 4, that is, interpolation I=4, extract D=9, according to the formula derived from the above correlation:

[0099] 1) For the first multiply-accumulate item, g m for The integer part of , the last input signal sequence corresponding to the mth output sequence y(m) is x(g m );

[0100] g 0 = 0, so the 0th output y(0) corresponds to the last input sequence as x(0)

[0101] g 1 =2, so the first output y(1) corresponds to the last input sequence as x(2)

[0102] g 2 =4, so the second output y(2) corresponds to the last input sequence as x(4)

[0103] g 3 =6, so the third output y(3) corresponds to the last input sequence as x(6)

[0104] g 4 =9, so the fourth output y(4) corresponds to the last input sequence as x(9)

[0105] g ...

Embodiment 2

[0195] It may be assumed that the sampling rate of the input signal x(n) is 40MHz, and now it is necessary to reduce the sampling rate to 160 / 10MHz, and the number of accumulators is L=2, then the decimation ratio of the decimation filter M=10 / 4, that is, interpolation I=4, extracting D=10, M=10 / 4 is about 5 / 2 after dividing, so T=5, the structure of this decimation filter is the same as Image 6 The structure of the first embodiment shown is similar, and only the filter coefficients are different. The calculation method of the filter coefficients refers to Embodiment 1, each group of filter coefficients includes 5 coefficients, and the first group of filter coefficients is h(0), h(6), h(2), h(8), h( 4), the second group of filter coefficients includes h(10), h(16), h(12), h(18), h(14). Each group of filter coefficients is stored in the coefficient memory 1 and the coefficient memory 2 respectively, and is cyclically output to the multiplication accumulator 1 and the multipli...

Embodiment 3

[0198] Assuming that the sampling rate of the input signal x(n) is 40MHz, it is now necessary to reduce the sampling rate to 160 / 11MHz, and the number of accumulators L=2, then the decimation ratio of the decimation filter M=11 / 4, that is, the interpolation I =4, extracting D=11, M=11 / 4 is still 11 / 4, therefore, T=11.

[0199] Similarly, the structure of the decimation filter is also the same as Image 6 Similar, but the filter coefficients are different. For the calculation method of the coefficients, refer to Embodiment 1. The first group of filter coefficients are in order h(0), h(7), h(3), h(10), h(6), h(2), h(9), h(5), h(1), h(8), h(4) cycle, the second set of filter coefficients are in the order of h(11), h(18), h (14), h(21), h(17), h(13), h(20), h(16), h(12), h(19), h(15) cycle.

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Abstract

The invention discloses a decimating filtering method and a decimating filter for ultrasonic imaging. The decimating filtering method comprises the following steps of: storing a filter coefficient; carrying out L-grade latching on an input signal, wherein L is multiplication accumulator number used during the filtering; as for each grade of latched input signals, reading the stored filter coefficient with the serial number of K from a coefficient memory for carrying out multiplication accumulating calculation with the grade latched input signals, wherein the serial number K of the read filter coefficient is formed by calculating the serial number num of the current latching-grade input signals, the serial number m of the current calculated output signal, an extracting factor D and an interpolation factor I; and accumulating L-grade latched multiplication accumulating calculation results to obtain a filtered output signal. The decimating filtering method and the decimating filter of the invention remove an interpolation inserted zero value and items of carrying out multiplication accumulating on the filter coefficient, directly carry out multiplication accumulation on the original input signal and the corresponding filter coefficient, thereby not only realizing the decimating filter of any fraction proportion but also reducing calculated amount.

Description

technical field [0001] The invention relates to a filtering method and a device in ultrasonic imaging, in particular to a method and a device for decimation filtering to realize arbitrary fraction ratio extraction. Background technique [0002] In the digital ultrasonic diagnostic system, the radiofrequency (radiofrequency) echo signal obtained after beamforming needs to be orthogonally resolved to the radiofrequency signal before color blood flow imaging, pulse spectrum Doppler imaging and two-dimensional cross-sectional imaging. Modulation processing, the radio frequency echo signal is firstly multiplied by cosine and sine respectively, and then through low-pass filtering to obtain the demodulated I (inphase), Q (quadrature) two-way signal, and finally color the I and Q two-way signal Blood flow imaging, pulsed Doppler imaging and 2D section imaging processing. [0003] Since the final video sampling rate used to display images is much smaller than the front-end digital r...

Claims

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Application Information

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IPC IPC(8): A61B8/00A61B8/06
Inventor 靳珊李勇
Owner SHENZHEN MINDRAY BIO MEDICAL ELECTRONICS CO LTD
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