CN1286959A - Non-destructive data compressing method and device for Holter system - Google Patents
Non-destructive data compressing method and device for Holter system Download PDFInfo
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- CN1286959A CN1286959A CN 00113782 CN00113782A CN1286959A CN 1286959 A CN1286959 A CN 1286959A CN 00113782 CN00113782 CN 00113782 CN 00113782 A CN00113782 A CN 00113782A CN 1286959 A CN1286959 A CN 1286959A
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Abstract
The present invention decomposes electrocardiac signal in different size by means of reconfiguring and shaping filter combination and multi-resolution analysis technology and proposes one variable-length optimized encoding scheme from the view point of statistics. The pulsation signal is sampled after one pulsation pulse detector circuit starts, the pulsation signal and electrocardiac signal decomposed based on the scheme are encoded and stored, and recorded code data are transferred to a computer.
Description
The invention belongs to the Medical Instruments technical field, further relate to the method and the relevant apparatus of lossless compress storage electrocardiosignal waveform in the Holter system.
The recorder that was used to write down body surface ecg in 24 hours in the digital continuous record formula Holter system is carried by patient, because the recorder volume is as far as possible little, the disposal ability of institute's employing processor (CPU) and the capacity of memorizer all are subjected to strict restriction.Owing to be subjected to the restriction of memory span, at present most of digital Holter system all adopts the different data compression methods that diminishes, since the performance of general processor (CPU) a little less than, be the real-time that guarantees data compression, compression algorithm is generally the direct compression method of the time domain that can realize fast.The direct compression method of time domain is to be based upon on the superfluous abundant basis of direct analysis initial data, and data point is divided into retention point and superfluous abundant point, by rejecting the purpose that superfluous abundant point reaches data compression.Generally use broken line reconstruct when data reconstruction, the waveform that obtains is stiff, has had a strong impact on its clinical value; Be difficult to guarantee high data compression rate and high information fidelity degree simultaneously do not have the such high frequency of the reservation ventricular late potential ability of information by a narrow margin in addition, and very responsive to High-frequency Interference.
The objective of the invention is to overcome the shortcoming of above-mentioned prior art, reconstruct is whole fully to propose a kind of employing--whole bank of filters electrocardiosignal is realized the efficient lossless data compression and with statistical analysis technique to electrocardiosignal and the pacing signal method of code storage simultaneously, and have more high performance Holter product with the exploitation of this method.
Fig. 1 is a structured flowchart of the present invention.
Fig. 2 is pacing signal amplifying circuit circuit theory diagrams of the present invention.
Fig. 3 is a pacemaker impulse testing circuit schematic diagram of the present invention.
Fig. 4 is two passages of the present invention reconfigurable filter group structural representations fully.
Below in conjunction with accompanying drawing principle of the present invention is elaborated.
Referring to Fig. 1, the inventive system comprises an electrocardiosignal amplifying circuit (1), a pacing signal amplifying circuit (2), a pacemaker impulse testing circuit (3), an A/D change-over circuit (4), a CPU (5) and a memory circuit (6).The body surface signal that is measured by body surface is input ecg signal amplifying circuit (1) and pacing signal amplifying circuit (2) simultaneously, A/D change-over circuit (4) is sent in the output of electrocardiosignal amplifying circuit (1) and pacing signal amplifying circuit (2) respectively, the output of pacing signal amplifying circuit (2) is simultaneously sent into pacemaker impulse testing circuit (3) as its input, the interrupt signal of CPU (5) as CPU (5) sent in the output of pacemaker impulse testing circuit (3), the output of A/D change-over circuit (4) links to each other with the bus of CPU (5), and the bus of CPU (5) also links to each other with memory circuit (6) simultaneously.
Referring to Fig. 2, pacing signal amplifying circuit of the present invention (2) comprises the second order high-pass filtering amplifier of being made up of A1, R1, R2, R3, R4, C1, C2, the body surface signal is imported this second order high-pass filtering amplifier, the second-order low-pass filter amplifier of being made up of A2, R5, R6, R7, R8, C3, C4 is sent in its output, and A/D change-over circuit (4) is sent in the output of this second-order low-pass filter amplifier.
Referring to Fig. 3, pacemaker impulse testing circuit of the present invention (3) comprises the band filter of being made up of A3, R9, R10, R11, C5, C6, its output is received the anode of diode D2 respectively and the input of the phase inverter be made up of A4, R15, R16, the anode of diode D1 is received in the output of this phase inverter, the negative electrode of D1 links to each other with the negative electrode of D2 and receives the IN+ end of IC1 comparator, IC1, R12, R13, R14 form the pacemaker impulse detection comparator, the IC1 comparator the OUT end interrupt importing with one of CPU (5) and link to each other.
Referring to Fig. 4, two passages of the present invention fully in the reconfigurable filter group structural representation H0 and H1 be called analysis filter, F
0And H
1Be called synthesis filter.Input signal is through H
0And H
1Carry out the lossless compress storage after the decomposition, restructing algorithm F
0And H
1Data to the lossless compress storage are carried out complete reconstruct.
The present invention be used to realize lossless data compression and to electrocardiosignal and pacing signal simultaneously the method for code storage be: by body surface detection to the body surface signal comprise electrocardiosignal and pacing signal, the frequency band of electrocardiosignal amplifying circuit (1) is 0.03--200Hz, and the frequency band of pacing signal amplifying circuit (2) is 300--10000Hz.The body surface signal obtains electrocardiosignal after by electrocardiosignal amplifying circuit (1), the body surface signal obtains pacing signal after by pacing signal amplifying circuit (2), pacemaker impulse testing circuit (3) detects pacing signal and sends interrupt signal in real time to CPU (5), thereby starts the sampling to pacing signal.
H in Fig. 4
0, H
1, F
0, F
1Should satisfy formula (A)
F
0(z)=H
1(-z) and F
1(z)=-H
0(-z).(A)
What formula (B) was corresponding puts in order--and whole mapping formula is (C).
A wherein
2m+1Be input signal, a
2mAnd b
2mBe respectively to decompose low frequency and the high frequency output signal that obtains, b '
2mBe the intermediate variable in the computational process,
Representative is no more than the maximum integer of x.Can be by this mapping original input signal a
2m+1Be decomposed into the high-frequency signal b that length is respectively half
2mWith low frequency signal a
2m
The ecg signal data that sampling obtains is with corresponding the putting in order of formula (C)--whole wavelet transformation decomposes.Adopt the multiresolution analysis technology, to the low frequency signal a after decomposing
2mWith same process at different yardstick 2
M+1Decompose (M≤m≤-1, M is the maximum progression that desire is decomposed), can be decomposed into one group of frequency component on different frequency bands to primary signal.
One group of frequency component and pace-making data on different frequency bands that above-mentioned decomposition obtains are carried out code storage with the encoding scheme shown in the table 1, thereby realize the lossless compress of data.
Table 1 encoding scheme
Identical with above-mentioned catabolic process, can fully reconstruct original waveform with formula (D).
| Explanation | The transform data amplitude | Code length | |
| Identity code | Numeric data code | ||
| Amplitude coding | |x|＜4 | |x| | |
| 4＜＝|x|＜12 | 1111 | |x|-4 | |
| 12＜＝|x|＜76 | 11111 | |x|-12 | |
| 76＜＝|x|＜2124 | 111110 | |x|-76 | |
| The pacemaker impulse sign | 111111 | ||
Embodiments of the invention are: the Holter system of exploitation 500Hz electrocardiosignal sample rate and 50kHz pacing signal sample rate.By body surface detection to the body surface signal obtain electrocardiosignal after by electrocardiosignal amplifying circuit (1), with this electrocardiosignal of 500Hz sample rate body real-time sampling: the body surface signal obtains pacing signal after by pacing signal amplifying circuit (2), pacemaker impulse testing circuit (3) detects pacing signal and sends interrupt signal in real time to CPU (5), is to start CPU to sample rate real-time sampling this pacing signal 1ms of pacing signal with 50kHz when detecting pacemaker impulse.The electrocardiosignal that sampling obtains is carried out segmentation by every section 2048 sampled points, with above-mentioned lossless compress and coded method electrocardiosignal and pacing signal are carried out while Real Time Compression code storage to every section then, thereby finish electrocardiosignal and pacing signal non-loss recording in the time of 24 hours.After record is finished the transfer of data that records is arrived computer, thereby realize 24 hours arrhythmia analysis, ST piecewise analysis, QT analysis, heart rate variability analysis, pace-making ecg analysis and ventricular late potential dynamic analysis.
The destructive data compressing method of the Holter system that the present invention proposes can not lost the initial data that any sampling obtains, and coded method is code storage electrocardiogram (ECG) data and pace-making data simultaneously.This method is owing to adopt whole--and the whole technology of hinting obliquely at has been avoided the floating-point operation problem, only needs to add, subtracts and shift operation, can realize fast, is particularly suitable for developing high performance Holter system.The thought that proposes with the present invention adopts other, and reconstruct is whole fully--whole bank of filters and revise that lossless compress that corresponding coding scheme extending to other biomedicine signals is stored even the lossless data compression of other subjects.
Claims (4)
1.Holter the destructive data compressing method of system, by body surface detection to the body surface signal comprise electrocardiosignal and pacing signal, the body surface signal obtains electrocardiosignal after by electrocardiosignal amplifying circuit (1), the body surface signal obtains pacing signal after by pacing signal amplifying circuit (2), pacemaker impulse testing circuit (3) detects pacing signal and sends interrupt signal in real time to CPU (5), thereby start sampling to pacing signal, then the ecg signal data that sampling is obtained is with corresponding the putting in order of formula (C)--whole wavelet transformation decomposes, one group of frequency component and pace-making data on different frequency bands that above-mentioned decomposition is obtained are carried out code storage then, thereby realize the lossless compress of data.
2. implement the device of the described method of claim 1, comprise an electrocardiosignal amplifying circuit (1), a pacing signal amplifying circuit (2), a pacemaker impulse testing circuit (3), an A/D change-over circuit (4), a CPU (5), with a memory circuit (6), it is characterized in that, the body surface signal that is measured by body surface is input ecg signal amplifying circuit (1) and pacing signal amplifying circuit (2) simultaneously, A/D change-over circuit (4) is sent in the output of electrocardiosignal amplifying circuit (1) and pacing signal amplifying circuit (2) respectively, the output of pacing signal amplifying circuit (2) is simultaneously sent into pacemaker impulse testing circuit (3) as its input, the interrupt signal of CPU (5) as CPU (5) sent in the output of pacemaker impulse testing circuit (3), the output of A/D change-over circuit (4) links to each other with the bus of CPU (5), and the bus of CPU (5) also links to each other with memory circuit (6) simultaneously.
3. device according to claim 2, it is characterized in that, said pacing signal amplifying circuit (2) comprises the second order high-pass filtering amplifier of being made up of A1, R1, R2, R3, R4, C1, C2, the body surface signal is imported this second order high-pass filtering amplifier, the second-order low-pass filter amplifier of being made up of A2, R5, R6, R7, R8, C3, C4 is sent in its output, and A/D change-over circuit (4) is sent in the output of this second-order low-pass filter amplifier.
4. device according to claim 2, it is characterized in that, said pacemaker impulse testing circuit (3) comprises the band filter of being made up of A3, R9, R10, R11, C5, C6, its output is received the anode of diode D2 respectively and the input of the phase inverter be made up of A4, R15, R16, the anode of diode D1 is received in the output of this phase inverter, the negative electrode of D1 links to each other with the negative electrode of D2 and receives the IN+ end of IC1 comparator, IC1, R12, R13, R14 form QRS complex wave detection comparator, the IC1 comparator the OUT end interrupt importing with one of CPU (5) and link to each other.
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| CNB001137824A CN1138501C (en) | 2000-04-11 | 2000-04-11 | Non-destructive data compressing method and device for Holter system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001137824A CN1138501C (en) | 2000-04-11 | 2000-04-11 | Non-destructive data compressing method and device for Holter system |
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| Publication Number | Publication Date |
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| CN1286959A true CN1286959A (en) | 2001-03-14 |
| CN1138501C CN1138501C (en) | 2004-02-18 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100349160C (en) * | 2005-09-08 | 2007-11-14 | 无敌科技(西安)有限公司 | Data compression method by finite exhaustive optimization |
| CN101290679B (en) * | 2002-01-16 | 2012-11-07 | 沃单提系统有限公司 | Optimizing data-transmission system and method |
-
2000
- 2000-04-11 CN CNB001137824A patent/CN1138501C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101290679B (en) * | 2002-01-16 | 2012-11-07 | 沃单提系统有限公司 | Optimizing data-transmission system and method |
| CN100349160C (en) * | 2005-09-08 | 2007-11-14 | 无敌科技(西安)有限公司 | Data compression method by finite exhaustive optimization |
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| Publication number | Publication date |
|---|---|
| CN1138501C (en) | 2004-02-18 |
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