SU460053A1 - Device for express analysis of phonocardiosignals - Google Patents

Description

one

This invention relates to the field of medical technology, in particular to apparatus for the automatic analysis of phonocardial signals.

A known device for automatic express analysis of phonocardial signals, comprising a microphone, a preamplifier, a sync pulse shaping circuit, a classification unit, a circuit for generating diagnostic parameters, including a unit for determining the power of phonocardiograms at intervals of and over and between the intervals of the system and diastole.

However, the known apparatus does not provide for the express analysis of phonocardial signals and the shortening of the examination time.

In order to improve the accuracy of express analysis of phonocardial signals and reduce the time of examination, the proposed device has low frequency and high frequency frequency selective amplifiers, a first and second tone pulse shaping unit, an identifier of these tops, phonocardial signal power determining units at observation intervals, lower intervals of the di diastol system, and determining the average frequency of intersection by the signal of the bullet level at intervals of tones and at intervals of observation, of smaller intervals of systole and diastole, in the low frequency and high frequency frequency selective amplifiers are connected to the output

preamplifier, low-frequency amplifier output through the first and second toims imiuls generation unit, the identifier of these tops and Olok of forming systolic and diasulistic intervals of impulses are connected to one of the inputs of the diagnostic parameters generating circuit, the second input of which is connected to the output of the high-frequency amplifier, and Oloki of determining power qyunocapedio-pa on the intervals of the population, less than the intervals of systole and diastole, and determine the average frequency of intersections by the signal of the bullet level on the inte On the tolivals of the population on the intervals of the population, the smaller intervals of the systole and the diastole, they are connected in parallel with the lights to determine the power of the phonocardpingale at the intervals of the tones, the systole and the diastole.

In the drawing of the isoperazhe, the chop scheme of the proposed express-analysis apparatus for phonocard psppnals.

The device contains electrically interconnected microphone 1, preamplifier g, and a synchronization circuit 3. impulses, Oloc 1 classification, cAciuy about njjjmirovaniya diagnostic parameters, yp ../1Huchayuschuyu block b to determine the power of phonocardios on the intervals of tones and on the intervals of systole and diastole. Aiparat has frequency selective amplifiers 7,

low and high frequency amplifiers 8 and 9, first and second tone pulse shaping unit 10, identifier 11 of these tones, phonocardial signal power determining blocks 12 at observation intervals, shorter systole and diastole intervals, and averaged zero-level signal intersection frequency at intervals of tops and steps intervals of observation, smaller intervals of systole and diastole, unit 13 of the formation of pulses of systolic and diastolic intervals.

The device works as follows.

Microphone 1 is placed on the surface of the patient’s chest. A phonocardio signal, captured by a microphone, is converted into an electrical signal that goes to preamplifier 2, which goes to frequency-selective amplifiers 8 and 9. From the output of amplifier 8, which has a horizontal amplitude-frequency characteristic, a phonocardiosignal containing clearly expressed low-frequency components of the first and second tones, is fed to the input of the unit 10 of the circuit 3 forming the clock pulses. Block 10 generates the low-frequency components of the pulses of the first and second tones along the envelope. These pulses are applied to identifier 11, which generates identification pulses. The intervals between the banks of the adjacent identification pulses are compared with each other. Shorter intervals are identified as systolic, and pulses located at the beginning of shorter intervals are identified as pulses corresponding to the beginning of the first tone. The remaining intervals are identified as diastolic, and the pulses as corresponding to the beginning of the second tone. Tone pulses are then fed to the input of block 13, which generates systole and diastole pulses, as well as observation interval pulses equal to 1/3 of the systolic interval and pulses of observation intervals equal to 1/3 of the diastolic interval. The synchronizing pulses are supplied to circuit 5. The circuit 5 also receives the fococardio signal from the output of amplifier 9, which has amplitude-frequency characteristic with a decrease in the low-frequency direction of 18 dB or octave from the frequency of 500 Hz, which makes it possible to detect high-frequency components of phonocardial signals.

Blocks 14-19 of the circuit 5 form the signs representing the ratio of the energy of phonocardioSignals at observation intervals to the duration of these intervals.

Blocks 20-25 of the circuit 5 form the signs representing the ratio of the number of intersections by the signal of the zero level at the observation intervals to the duration of these intervals.

These signs in the form of direct current voltages are supplied to a network of 26 m-level threshold elements, from the output of which the values of each level as one of the two values of the voltage, corresponding to the nj, HX values of 0 or 1, are fed to the input of the block 27 logic functions, which forms a logical, functional, acceptance, O or 1 value depending on which of the two classes "norm or" norm refers to the phonocardiogram to be removed.

Subject invention

A phonocardial signal express analysis device containing a microphone, an electrically connected microphone, a preamplifier, a sync pulse shaping circuit, a classification unit and a diagnostic parameter generating circuit including

The unit for determining the power of phonocardiosignals at intervals of tones, systole and diastole, characterized in that, in order to increase the accuracy of the express analysis of phonocardios and reduce the time

examination, it has low-frequency and high-frequency frequency-selective amplifiers, a first and second tone pulse shaping unit, an identifier for these tones, blocks for determining the power of a phonocardi signal at observation intervals, shorter systole and diastole intervals, and determining the zero level signal intersection frequency at tones and at intervals of observation, of smaller intervals of systole and diastole, the inputs of low and high frequency frequency selective amplifiers are connected to the output of the preamplifier, the output d the low-frequency amplifier through the unit of the impulses of the first and second pulses

tones, the identification of these tones and the pulse shaping unit of the systolic and diastolic intervals are connected to one of the inputs of the diagnostic parameters generating circuit, the second input of which is connected to the output of the high frequency, and the units determining the power of the phonocardi signal at the observation intervals smaller than the systole and diastole intervals, and determining averaged zero-level intersection frequency at tone intervals and at observation intervals, shorter systole and diastole intervals, includes a pair It is compatible with the unit for determining the power of phonocardial signals at intervals of tones, systole and diastole.

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