CN1423997A - Real time data collecting lossless compressing method for 12 lead ECG - Google Patents
Real time data collecting lossless compressing method for 12 lead ECG Download PDFInfo
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- CN1423997A CN1423997A CN02144672A CN02144672A CN1423997A CN 1423997 A CN1423997 A CN 1423997A CN 02144672 A CN02144672 A CN 02144672A CN 02144672 A CN02144672 A CN 02144672A CN 1423997 A CN1423997 A CN 1423997A
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- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000007906 compression Methods 0.000 claims abstract description 36
- 230000006835 compression Effects 0.000 claims abstract description 36
- 230000001360 synchronised effect Effects 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 238000002565 electrocardiography Methods 0.000 abstract 1
- 238000003860 storage Methods 0.000 description 4
- 230000000747 cardiac effect Effects 0.000 description 2
- 230000005039 memory span Effects 0.000 description 2
- 238000010626 work up procedure Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000003759 clinical diagnosis Methods 0.000 description 1
- 238000013144 data compression Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 230000005055 memory storage Effects 0.000 description 1
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Abstract
A lossless compression method for high-precision real-time acquisition of 12-lead electrocardiogram is disclosed, which is suitable for the 12-lead HOLTER system or portable hand-held electrocardiography with low-power low-speed less-RAM single-chip microprocessor.
Description
Affiliated technical field
The invention belongs to the Medical Instruments technical field, particularly the method for real non-destructive compression storage electrocardiosignal waveform in the real-time synchronous acquisition of 12 lead electrocardiogram.
Background technology
12 lead electrocardiogram synchronous recording technology are at present in the medical Instrument field extensive use.For the cardiac work up diagnostic device based on computer system, the spatial capacity of the operating rate of computer CPU and hard-disc storage does not constitute problem, and a large amount of electrocardiogram (ECG) data that the short time gathers can be stored fully, need not any compression and handles.But development along with the Medical Instruments level, at present a lot of cardiac work up diagnostic devices are to the miniaturization development of portable and hand-held, need to gather for a long time or momentarily the ecg information of human body, and acquisition precision is more and more higher, acquisition time is more and more longer, and the Electrocardiographic data volume that collects is increasing.Simultaneously, the requirement to the small size of instrument, low-power consumption etc. adds the restriction of single-chip microcomputer performance and memory span, and the method for storage is arisen at the historic moment.But compression method in the past reach can be practical compression speed and compression ratio after, losing of distortion and many minutias appears in the electrocardiographic wave that restores out, the distortion factor is very big, influences clinical diagnosis; Also have some compression methods can accomplish lossless compress substantially, but very complicated in actual use, and to the requirement height of single-chip microcomputer.
Summary of the invention
In order to overcome existing compression method in electrocardiogram (ECG) data compression back reduction distortion and the shortcoming high to resource requirements such as CPU, RAM, the invention provides a kind of in processing speed low and the internal RAM resource is few and the single-chip microcomputer of low-power consumption on the lossless compression method of realization 12 lead electrocardiogram high-precise synchronization when gathering in real time.
The technical solution adopted in the present invention is: use low-power consumption, processing speed is low and the few single-chip microcomputer of internal RAM resource when carrying out the synchronous high precision collecting of 12 lead electrocardiogram, carry out real-time lossless compress for each electrocardiogram (ECG) data that leads that collects, after the data accumulation after the compression arrives certain amount, the write memory storage.The lossless compression method that is adopted is very suitable for the compression of electrocardiosignal waveform and similar Wave data.
Lossless compression algorithm is described:
If k is i the current memory word joint number of leading, m
i(k) be the numerical value that i leads and stores in k the byte
X
i(n) be i n input value of leading, Y
i(n) be that i leads through n value of system's output
For 12 each channel data transmission systems through representing earlier all of leading in the electrocardiosignal synchronized sampling by accompanying drawing
In the accompanying drawing:
The 12 signal X that lead
1, X
2..., X
11, X
12Be the input of system, Y
1, Y
2..., Y
11, Y
12Output for system.
H (z) is the transfer function of system, and its z conversion expression formula is as follows:
To i the X that leads
iOutput Y
i, work as Y
iValue when satisfying some in following three conditions, adopt corresponding method to compress:
1) as output Y
i(n)=0 o'clock, adopt lossless compression method 1.
2) as output-8≤Y
i(n)≤7 o'clock, adopt lossless compression method 2.
3) as output Y
iWhen (n) being worth for other, m
i(k+1)=X
i(n).
Lossless compression method 1: judge Y
i(n-1) value:
1) works as Y
i(n-1)=0 o'clock, m
i(k)
New=m
i(k)
Old+ 1
2) Y
iWhen (n-1) being worth for other, m
i(k+1)=2
Lossless compression method 2: judge Y
i(n-1) value:
(1) 0 〉=Y
i(n-1) or Y
i(n-1)＞7 o'clock, m
i(k+1)=Y
i(n)
(2) Y
iWhen (n-1) being worth for other, m
i(k)
New=m
i(k)
Old* 128+Y
i(n)
The inventive method is applicable to the heart real time data collecting system of being made up of single-chip microcomputer and 8 bit A/D converters, can the data that collect be carried out depositing in the memorizer after the lossless compress with the simple and high-efficient method, the inventive method also can be applicable to 12 lead or the ecg signal acquiring of multi-lead HOLTER record in, be applied in the electrocardiogram signal acquisition device of other portable and hand-held.
Description of drawings
Accompanying drawing is the inventive method transmission system sketch map.
The specific embodiment
Use low-power consumption, processing speed is low and the few single-chip microcomputer of internal RAM resource carries out lossless compress (multi-lead HOLTER system or hand-held multi-lead ECG collection device) when carrying out the synchronous high precision collecting of 12 lead electrocardiogram in real time, record in the memorizer again.
Lossless compression method 1 among the present invention can be realized very high compression ratio for Electrocardiographic baseline, and lossless compression method 2 is fit to compression T ripples, P and involves the baseline that has low-frequency disturbance etc. and change signal more slowly, and is not very remarkable for the compression of jump signals such as QRS wave group and strong jamming.These two kinds of lossless compression methods combine and can make Compression of Electrocardiogram Signals obtain more satisfactory lossless compression ratio.Use these two kinds of compression method results to show: single-chip microcomputer is with the AD data of 8 passages of sample frequency processing of 512 point/seconds under the 4MHz system clock, and its compression ratio is 3-3.5 times.Development along with present memory span, do not need to carry out the lossy compression method of big compression ratio, computing and implement other complicated lossless compression methods and also require high to the arithmetic speed of single-chip microcomputer, RAM resource etc., use this simple and easy to do electrocardiogram (ECG) data lossless compression method, the data in real time lossless compress of electrocardio sampling is arrived about 1/3rd original storages again, satisfy the actual demand of using fully.
Claims (1)
1, the method for lossless compress during a kind of 12 lead electrocardiogram are gathered in real time, it is characterized in that, in processing speed low and the internal RAM resource few and the single-chip microcomputer of low-power consumption on realization 12 lead or the lossless compress of the electrocardiogram (ECG) data of multi-lead electrocardiogram high-precise synchronization when gathering in real time, for 12 lead each channel data in the electrocardiosignal synchronized sampling all pass through earlier by
The system of the transmission characteristic that formula is represented, then at output result's difference, adopt diverse ways to compress:
1) when output Y (n)=0, adopt lossless compression method 1,
2) when output-8≤Y (n)≤7, adopt lossless compression method 2,
3) when output Y (n) is worth for other, do not compress;
Its lossless compression method 1 and 2:
If i is current memory word joint number, m (i) is the numerical value of storing in the 1st byte
Lossless compression method 1: the value of judging Y (n-1) in y (n) sequence:
1) when Y (n-1)=0, m (i)
New=m (i)
Old+ 1
2) when Y (n-1) is worth for other, m (i+1)=2
Lossless compression method 2: the value of judging y (n-1) in Y (n) sequence:
(1) 0 〉=Yi (n-1) or Yi (n-1)＞7 o'clock, m (i+1)=Y (n)
When (2) Y (n-1) is worth for other, m (i)
New=m (i)
Old* 128+Y (n).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021446725A CN1206961C (en) | 2002-12-03 | 2002-12-03 | Real time data collecting lossless compressing method for 12 lead ECG |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021446725A CN1206961C (en) | 2002-12-03 | 2002-12-03 | Real time data collecting lossless compressing method for 12 lead ECG |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1423997A true CN1423997A (en) | 2003-06-18 |
| CN1206961C CN1206961C (en) | 2005-06-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021446725A Expired - Fee Related CN1206961C (en) | 2002-12-03 | 2002-12-03 | Real time data collecting lossless compressing method for 12 lead ECG |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101669819B (en) * | 2009-09-25 | 2011-06-01 | 西安电子科技大学 | Electrocardiogram signal lossless compression method based on PT conversion and linear prediction combination |
| CN102697492A (en) * | 2012-05-25 | 2012-10-03 | 长春华讯信息科技有限公司 | Real-time electrocardio information analysis system and analysis method thereof |
| CN103815895A (en) * | 2014-01-05 | 2014-05-28 | 深圳市中瑞奇电子科技有限公司 | ECG (electrocardiogram) data compression and decoding method |
| CN104114086A (en) * | 2012-02-08 | 2014-10-22 | 国立大学法人九州工业大学 | Biological information processing device, biological information processing system, biological information compression method, and biological information compression processing program |
| CN113040781A (en) * | 2021-03-11 | 2021-06-29 | 广州市康源图像智能研究院 | I-lead electrocardiogram data identification method and system |
-
2002
- 2002-12-03 CN CNB021446725A patent/CN1206961C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101669819B (en) * | 2009-09-25 | 2011-06-01 | 西安电子科技大学 | Electrocardiogram signal lossless compression method based on PT conversion and linear prediction combination |
| CN104114086A (en) * | 2012-02-08 | 2014-10-22 | 国立大学法人九州工业大学 | Biological information processing device, biological information processing system, biological information compression method, and biological information compression processing program |
| CN104114086B (en) * | 2012-02-08 | 2015-11-25 | 国立大学法人九州工业大学 | The compression method of biological information processing unit, Biont information processing system and Biont information |
| CN102697492A (en) * | 2012-05-25 | 2012-10-03 | 长春华讯信息科技有限公司 | Real-time electrocardio information analysis system and analysis method thereof |
| CN102697492B (en) * | 2012-05-25 | 2014-08-06 | 长春华讯信息科技有限公司 | Real-time electrocardio information analysis method |
| CN103815895A (en) * | 2014-01-05 | 2014-05-28 | 深圳市中瑞奇电子科技有限公司 | ECG (electrocardiogram) data compression and decoding method |
| CN113040781A (en) * | 2021-03-11 | 2021-06-29 | 广州市康源图像智能研究院 | I-lead electrocardiogram data identification method and system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1206961C (en) | 2005-06-22 |
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Address after: 110179 Liaoning city of Shenyang province Shenyang Hunnan hi tech Industrial Development Zone, East Software Park. Patentee after: Dongruan Medical Systems Co., Ltd., Shenyang Address before: 110179 Liaoning city of Shenyang province Shenyang Hunnan hi tech Industrial Development Zone, East Software Park. Patentee before: Shenyang Dongruan Digital Medical System Co., Ltd. |
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