KR20060102758A - Usb digital stethoscope - Google Patents

Abstract

 The present invention relates to a digital stethoscope, and more particularly, to a USB stethoscope that can amplify and filter the collected chest sounds, and store and listen to the waveform of the chest sounds by a biosignal analysis algorithm through the USB port.

According to a first aspect of the present invention, there is provided a USB digital stethoscope according to an aspect of the present invention, which comprises: an input unit including a collector for collecting and converting a biological signal generated from a human body into an electrical signal; A first amplifier for amplifying the electroacoustic signal, an ultra low pass filter for passing a signal of a predetermined frequency band among the amplified electroacoustic signals, a second amplifier for amplifying a biosignal output through the ultra low pass filter, and the like A control unit including an audio unit unit for removing the noise by passing only the signal of a predetermined frequency band through the amplified biosignal through a predetermined filter; An output unit comprising an earphone or a speaker for outputting a signal output through the π filter & inverse L-type filter as an acoustic signal; Characterized in that, because the clinical data and prescription based on the thorax sound database and diagnostic software at the time of diagnosis provides a reliable diagnosis possible effect.

Stethoscope, Digital Stethoscope, Chest, Biosignal, USB

Description

USB Digital Stethoscope {USB DIGITAL STETHOSCOPE}

1 is a system block diagram of a USB digital stethoscope according to a first embodiment of the present invention;

2 is a system block diagram of a USB digital stethoscope according to a second embodiment of the present invention;

3 is a system block diagram of a USB digital stethoscope according to a third embodiment of the present invention;

4 is a block diagram showing the progress of a biosignal analysis program according to the present invention;

5 is a circuit diagram showing a π filter and an inverse L-type filter in a system block diagram of a USB digital stethoscope according to the present invention;

6 is a signal display diagram illustrating samples and holders in a system block diagram of a USB digital stethoscope according to the present invention;

7 is a screen capturing a biosignal analysis and diagnostic program according to the present invention,

7A to 7D are screens capturing clinical diagnostic graphs detected using a biopsy program.

The present invention relates to a digital stethoscope, and more particularly, to a non-US digital stethoscope that amplifies and filters the collected chest sounds, and stores or outputs the waveforms of the chest sounds by a biosignal analysis algorithm through a USB port. It is about.

The traditional analog stethoscope, invented by Raenek in 1819, is a stethoscope that includes a thoracic detector and an earpiece and a tub connecting the thoracic detector and the earpiece.

 The mechanical stethoscope is widely used in the medical field to date, and recently, the electronic stethoscope (analog amplification method) has been converted.

When the stethoscope is configured as described above for a long time, the hearing loss and pain of the doctors reach a serious level. As a result, a large number of problems occurred in treating patients due to pain in the ears of the doctors, leading to the cause of the misdiagnosis.

On the other hand, the conventional analog stethoscope and the recent electronic stethoscope detect the chest sound only by the doctor alone, and the error rate is relatively high due to the subjective judgment of the individual doctor. There was a problem that one-sided medical treatment was performed without hearing.

In addition, the conventional analog stethoscope was impossible to store the medical data in the database due to the analog method, and thus there was a problem that remote transmission is impossible.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a USB digital stethoscope that can store and reproduce the collected biological signals through the USB.

Still another object of the present invention is to provide a USB digital stethoscope capable of remote transmission by converting medical data into a digital signal and making a database.

Still another object of the present invention is to provide an USB digital stethoscope for objective and reliable diagnosis by a chest sound database and diagnostic software during medical examination.

Another object of the present invention is to provide a USB digital stethoscope to overcome the hearing impairment and pain of doctors due to the use of a conventional stethoscope.

In accordance with a first aspect of the present invention, a USB digital stethoscope according to the first aspect of the present invention comprises: an input unit including a collector for collecting and converting a biological signal generated from a human body into an electrical signal;

A first amplifier for amplifying the electroacoustic signal; An ultra low pass filter for passing a signal of a predetermined frequency band among the amplified electroacoustic signals; A second amplifier for amplifying the biosignal output through the ultra low pass filter; An audio unit for removing noise by passing only the signal of a predetermined frequency band through the amplified biosignal as described above; Control unit consisting of;

An output unit including an earphone or a speaker for outputting a signal output through the audio unit as a sound signal; Characterized in that consisting of.

Specifically, the frequency of the ultra low pass filter is set to 1.0KHz, and the frequency of the sampling circuit is set to 2.0KHz or more.

The audio unit may include a signal detection circuit for detecting a chest sound from an amplifier; And a π filter & an inverted L-type filter for removing noise by passing only a signal of a predetermined frequency band through the signal output from the signal detection circuit.

In accordance with a second aspect of the present invention, a USB digital stethoscope according to the second aspect of the present invention comprises: an input unit including a collector for collecting and converting a biological signal generated from a human body into an electrical signal;

A first amplifier for amplifying the electroacoustic signal; An ultra low pass filter for passing a signal of a predetermined frequency band among the amplified electroacoustic signals; A signal input interface for transmitting the biosignal output through the ultra low pass filter to an automatic gain controller; An automatic gain adjuster for maintaining or controlling a biosignal transmitted through the signal input interface in a state close to an original signal; A sample & holder circuit for sampling or holding a signal output from the auto gain controller; An A / D converter converting the sampled or honed analog signal into a digital signal; A digital signal processor for encoding / decoding, volume control, voice detection, noise control, and signal compression and recovery; A D / A converter converting an output of the digital signal processor into an analog signal and outputting the analog signal; A signal adjusting volume group for controlling an amplitude of the output of the D / A converter; Control unit consisting of;

An audio output unit configured to output an output of the signal adjusting volume unit as an audio signal; Characterized in that consisting of.

Specifically, the voice output unit is characterized in that the earphone or speaker.

In accordance with a third aspect of the present invention, a USB digital stethoscope includes: an input unit configured to collect a biosignal generated from a human body and convert the biosignal into an electrical signal;

A first amplifier for amplifying the electroacoustic signal; An ultra low pass filter for passing a signal of a predetermined frequency band among the amplified electroacoustic signals; A signal input interface for transmitting the biosignal output through the ultra low pass filter to an automatic gain controller; An automatic gain adjuster for maintaining or controlling a biosignal transmitted through the signal input interface in a state close to an original signal; A sample & holder circuit for sampling or holding a signal output from the auto gain controller; An A / D converter converting the sampled or honed analog signal into a digital signal; A digital signal processor for encoding / decoding, volume control, voice detection, noise control, and signal compression and recovery; Control unit consisting of;

A USB port for inputting a signal output from the controller to a personal computer in a predetermined form; A personal computer for diagnosing and analyzing a signal input through the USB port by a predetermined algorithm; Output portion consisting of; Characterized in that consisting of.

Specifically, the audio unit unit signal detection circuit for detecting chest sounds from the amplifier; And a π filter & an inverted L-type filter for removing noise by passing only a signal of a predetermined frequency band through the signal output from the signal detection circuit.

In addition, it is characterized in that the signal transmission form for inputting and outputting the signal through any one of DOWN STREEM, UP STREEM, 16 BIT MONO STREEM, 24 BIT STREO STREEM through the USB port.

In addition, the personal computer connected to the U-S Viport is characterized in that the collection of the chest sound signal and collective management by receiving any one or more of the blood pressure, body temperature, hoeup or oxygen saturation (SpO ₂ ) that is a biological signal through the sound collector It is done.

In addition, a hanning window unit for generating necessary data by using a chest sound signal to the personal computer; And a fast Fourier transform unit and an algebraic energy crossing rate calculator for diagnosing or analyzing the biosignal.

In addition, the fast Fourier transform unit and the logarithmic energy cross-section calculation unit includes a biosignal diagnostic algorithm (LCR algorithm), characterized in that for analyzing the logarithmic energy cross-rate for each chest sound to display on the monitor of the personal computer.

In addition, the monitor of the personal computer is characterized in that the touch screen.

In accordance with a fourth aspect of the present invention, a USB digital stethoscope includes: a sound collecting unit having a function capable of collecting a biological signal generated in a human body and transmitting the collected biological signal to a controller;

A controller having a function of amplifying, filtering, converting, and controlling a signal received from the sound collecting unit and transmitting the filtered signal to a output unit;

And an output unit displaying a signal output from the controller or having a function capable of diagnosis and analysis by a predetermined algorithm.

Preferred embodiments of the present invention having such features will be described in detail with reference to the accompanying drawings.

1 is a system block diagram of a USB digital stethoscope according to a first embodiment of the present invention. As shown, the sound collector 110, an amplifier 210, an ultra low pass filter 220, LPF, amplifier 230, the audio unit 240, earphones or speakers 310 are composed of.

The input unit 100 is preferably a sound collector 110 that collects a biological signal generated by the human body and converts the signal into an electrical signal. Furthermore, preferably, the sound or thoracic signal generated from the chest of the human body is collected and transmitted to the amplifier 210.

The control unit 200 is an ultra-low pass filter 220 for passing a signal of a predetermined frequency band of the first amplifier 210 and the amplified electroacoustic signal transmitted from the sound collector 110 and the A second amplifier for amplifying the biosignal output from the ultra-low pass filter 220, the audio unit 240 to remove the noise by passing the signal of a predetermined frequency band through a predetermined filter through the biosignal amplified and output as described above Preferably, the ultra-low pass filter 220 is set to 1.0KHz to block frequencies below 1.0KHz. The audio unit 240 includes a signal detection circuit 242 and a π filter & inverse L-type filter 241. The π filter & inverse L-type filter 241 has an ultra-low pass filter of a bio signal. It removes a part of the high frequency signal leaking out of the signal output through the 220, and protects the high frequency signal from being transformed into the original signal of the biological signal.

The output unit 300 is preferably an earphone or a speaker 310 capable of outputting a signal output from the audio unit 240 as a sound signal as described above.

The π-type filter removes a part of the high frequency signal leaked from the output signal through the ultra low pass filter 220, the high-frequency signal deforms the original signal of the chest sound (π-type filter) In this case, after removing the high frequency component, in the inverse L-type filter, the high frequency component is removed twice to reproduce the original signal. ) And C (capacitor) is preferably a circuit.

2 is a system block diagram of a USB digital stethoscope according to a second embodiment of the present invention. As shown, the sound collector 110, the amplifier 410, the ultra low pass filter 420, the signal input interface 430, the automatic gain regulator 440, the sample & holder circuit 450, A / D converter ( 460, the digital signal processor 470, the D / A converter 480, the signal control volume 490, and the audio output means (510).

The input unit 100 is preferably a collector 110 that collects a biological signal generated from the human body and converts it into an electrical signal. More preferably, the sound is generated from the chest of the human body, or collects a biological signal (thoracic signal) and transmits to the amplifier 410.

The control unit 400 is an ultra low pass filter 420 and the ultra low pass to pass a signal of a predetermined frequency band of the first amplifier 410 and the amplified electroacoustic signal transmitted from the sound collector 110 The signal input interface 430 for transmitting the biosignal output through the pass filter 420 to the automatic gain controller 440 and the biosignal transmitted through the signal input interface are kept close to the original signal. Or a sample & holder circuit 450 for sampling or holding a signal output from the auto gain controller 440 and the auto gain controller 440 for controlling and the sampled or holdered analog. An A / D converter 460 for converting a signal into a digital signal, a digital signal processor 470 for encoding / decoding, volume control, voice detection, noise control, and signal compression and restoration The D / A converter 480 converts the output of the digital signal processing unit into an analog signal and outputs the analog signal, and a signal adjusting volume unit 490 for controlling the amplitude of the output of the D / A converter 480.

In addition, the A / D converter 460 and the D / A converter 480 preferably have a performance of THD (Total Harmonic Distortion) of 0.01 (%) and SNR (Signal Noise Ratio) of 96 (dB) or more. (Total Harmonic Distortion) shows the accurate reproduction rate of the original signal of the chest sound less than 0.01 (%), and the SNR (Signal Noise Ratio) is set to 96 (dB) or more, the separation of the chest signal and noise It is a figure that shows the best degree of separation by precisely adjusting the ratio to about 100,000 to 1.

The signal adjusting volume 490 sets the bias at the pre-stage to hear the thorax that is not distorted by the speaker or earphone with the analog signal output from the D / A converter 480 (DAC). As a module, the amplified analog signal is controlled by a variable resistor to adjust only the amplitude of the chest sound, maintain the frequency and adjust the amplified signal.

The automatic gain controller 440 is a circuit that amplifies a signal having a weak amplification greatly and amplifies a signal having a strong signal small so that it is always input as a constant signal. In addition, the sample & holder circuit 450 generates 2.0 data in a non-continuous time when changing the bit to convert the chest sound analog signal into a digital signal as shown in FIG. 6. Sampling is performed through a sampling circuit having a frequency above KHz, and the digital signal is held to hold the digital signal.

The output unit 500 is preferably an earphone or a speaker which is a voice output means 510 capable of outputting a signal output from the signal adjusting volume 490 as an acoustic signal.

3 is a system block diagram of a USB digital stethoscope according to a third embodiment of the present invention. As shown, sound collector 110, amplifier 610, ultra low pass filter 620, signal input interface 630, automatic gain controller 640, sample & holder 650, A / D converter 660 ), A digital signal processing unit 670, a USB port 710, PC (720).

The input unit 100 is preferably a collector 110 that collects a biological signal generated from the human body and converts it into an electrical signal. More preferably, it collects sound generated from the chest of the human body or a thoracic signal and transmits the sound to the amplifier 610.

The control unit 600 includes an amplifier 610 for amplifying the electroacoustic signal transmitted from the sound collector 110 and an ultra low pass filter 620 for passing a signal of a predetermined frequency band among the amplified electroacoustic signals, and the ultra low pass filter. Maintain or control the signal input interface 630 for transmitting the bio signal output through the 620 to the automatic gain controller 640 and the bio signal transmitted through the signal input interface in a state close to the original signal. A sample & holder circuit 650 for sampling or holding the signal output from the auto gain controller 640 and the auto gain controller 640 and the sampled or honed analog signal. A / D converter 660 for converting into a digital signal and a digital signal processing unit 670 for encoding / decoding, signal compression and recovery function.

The output unit 700 transmits the signal output through the digital signal processor 670 to the PC 720 in a predetermined form and inputs a signal input through the USB port 710 and the USB port 710. It consists of the PC 720 which diagnoses and analyzes by a predetermined algorithm.

In addition, the signal transmitted to the digital signal processing unit 670 is buffered (BUFFERING) to the ROM and RAM, which is a separate auxiliary storage device built into the PC 720 by the US B port 710, or the signal The biosignal diagnosis and analysis program stored in 720 is input to the liquid crystal display.

In addition, it is preferable to receive or transmit the chest sound digital signal through the USB port 710 in the form of DOWN & UP STREEM, 16BIT MONO STREEM, 24BIT STREEM to the PC 720, and change the sampling rate (6.4 ~ 48KHz). It is possible to use, if the use of the USB port 710, it is possible to use a separate rechargeable battery, the rechargeable battery is preferably made while using the USB port 710.

Since the device power of the present invention uses the power supplied from the USB port, it does not need a separate power supply, and normally charges the built-in rechargeable battery (3.6V Ni-cd), but it is used with the USB digital stethoscope and the existing analog cleaner. If you want to use a separate built-in rechargeable battery (3.6V Ni-cd) can be used in the form of an analog stethoscope.

4 is a block diagram showing the progress of the biosignal diagnosis and analysis program according to the present invention. First of all, the biosignal analysis proceeds to the PC 720 through the US Bepot 710 through the U.S. behaviour 710, such as chest hearing sound, blood pressure, body temperature, respiratory sound, and oxygen saturation received from the sound collector 110.

The PC 720 is equipped with a bio-diagnostic algorithm, which enables processing and display of chest sound data collected from the sound collector 110 (shown in FIGS. 1, 2, and 3), and is received through the USB PORT 710. The biosignal is analyzed on a logarithmic energy crossover rate for each biosignal by a predetermined biosignal analysis algorithm included in the fast Fourier transform unit (FFT) and the logarithmic energy crossover rate (LCR) calculation unit 713 and displayed on the monitor 714. do.

All numerical values represented by the monitor 714 and the operation state of the program are displayed on the monitor 730. Since the monitor 714 is a touch screen and can be easily operated, the time for medical examination is shortened. There is an advantage to this.

In order to extract the characteristics of the thoracic signal, acoustic parameters are required through signal analysis. The thoracic signal is analog thoracic information continuously input over time. It is necessary to digitize the analog chest information, and to overcome the limitations of hardware resources, a compression process is required in a range where the chest information is not lost. Compression of chest information is to remove and store the redundancy information of the signal. When the chest signal is input to the recognizer without any control to recognize the chest information, it processes data consisting of a lot of redundancy. Waste of identifier resources is generated. Therefore, in order to reduce the waste of recognizer resources, an analysis section of a defined width is defined for the input voice (Hanning window is optimal at the time of section definition), and the characteristics of the voice in this section are analyzed or used or utilized. Done.

The algebraic energy crossover rate is calculated using the following Equation 1 in the algebraic energy crossover rate calculator 720 built in the PC 700.

The TH is a threshold value and may be determined by the characteristics of the input value and various experimental results. Since the threshold value and the computational difficulty are large, in the present invention, it is assumed that the TH value is not always constant. It observes the change according to the characteristics of the signal and decides by using the characteristics of the input signal on average. That is, the threshold value is determined by the input variable. Therefore, the threshold that is used empirically for signal detection is fixed, and the threshold that changes according to the situation is determined.FFT voice data is used to determine the biometric value by using the sum of energy from 20Hz to 4KHz, LCR and continuous increase of energy. Signal section is detected.

 On the other hand, the progress of the biosignal diagnosis is a biosignal such as chest hearing sound, blood pressure, body temperature, breathing sound, oxygen saturation received from the sound collector 110 is transmitted to the PC 720 through the USB PORT.

The PC 720 is equipped with a bio-diagnostic algorithm, the processing and display of the chest sound data collected from the sound collector 110, and can display the biological signal received through the USB port 710 Hanning window 711; Through the Hanning Window, it generates the data necessary for diagnosis and analysis.

The biosignal transmitted to the PC 720 is a logarithmic energy crossover ratio for each biosignal by a predetermined biosignal analysis algorithm included in the fast Fourier transform unit (FFT) and the logarithmic energy crossover ratio (LCR) calculation unit 713. It analyzes and displays on the monitor 714.

All numerical values and operating states of the program displayed on the monitor 714 are displayed on the monitor 714. Since the monitor 714 is a touch screen and can be easily operated, the time for medical examination is shortened. There is an advantage to this.

In addition, the PC 720 receives a biological signal such as chest hearing sound, blood pressure, body temperature, respiratory sound, and oxygen saturation transmitted through the US Beport 710, and displays numerical values such as predetermined blood pressure, body temperature, respiratory sound, and the like. The biosignal may be analyzed through 715 to display respective numerical values on the monitor 714 capable of a touch screen.

As such, it is preferable to transmit the diagnosed or analyzed digital data signal to the PC 720 or a separate personal computer to store the clinical data, and to view the chest signal visually and to record and use the doctor's findings.

As a result, it is possible to prevent the patient's disease or symptoms from being judged only by the loss of data and the subjective findings of the individual doctor, which are the major disadvantages of the conventional analog stethoscope.

7 is a screen capturing a biosignal analysis and diagnostic program according to the present invention. Referring to FIG. 7, the functions of each part will be described. ① is a button for recording chest sounds, ② is a button for reproducing chest sounds, and ③ Is the stop button for recording or playing the thorax, ④ is the open button for loading the thorax database, ⑤ is the save button for storing the contents of the thorax, and ⑥ is for saving the thorax database under a different name. ⑦ is a window for displaying the patient's body temperature, ⑧ is a window for displaying the maximum and minimum of the patient's blood pressure, ⑨ is a window for displaying the pulse rate of the patient, and a window for displaying the LCR value, which is a diagnostic algorithm. Values distinguish bronchitis, pneumonia, and asthma), a window showing recording levels when recording chest sounds, and spectrograms displayed when calling or diagnosing chest sounds from data (frequency is 0 to 1.0). KHz 1.0 ~ 2.0KHz), ⑬ is the original sound wave displayed by expanding the designated section of the original sound in ⑭, ⑭ is displayed when calling or diagnosing chest sound in database Length of overall thorax being recorded (recorded).

7A to 7D are screens capturing waveforms and spectrograms according to a biosignal as clinical diagnostic graphs detected using the biodiagnostic program (algorithm) in FIGS. 7A to 7D.

Figure 7a shows a waveform of a clean form with a normal breathing sound of a normal person, Figure 7b shows a waveform of an asthma patient with abnormal breathing sound of a normal person, Figure 7c shows a mild asthma (initial asthma) state Figure 7d shows that the moderate asthma (usually asthma) state can be confirmed.

Is a section of the overall waveform, and when the doctor sees the waveform in the database and says that it is a problem, the section can be analyzed in detail.

The present invention, in addition to the various embodiments as described above, if the doctor and the patient or the trainee wants to hear the chest sound of the patient at the same time, or at the same time to display the chest sound at the same time the D / A converter in the USB port (710, Figure 3) Through the signal control volume 490 (shown in FIG. 2) whose signal size is adjustable through the DAC (shown in FIG. 2), the audio output means 510 may be output to a speaker or earphone.

Therefore, the USB digital stethoscope according to the present invention collects a biological signal (thoracic signal), in particular a liquid crystal display (LCD) and sound that shows the sound of the sound collector by the sound collector by the biosignal diagnostic program through the USB It can be heard by (Earphone / Speaker), and also it can store chest sound as digital data by biosignal diagnosis algorithm, and it also includes the function to save the patient's personal information and the doctor's clinical record.

In addition, the digital data can provide an optimal diagnosis name in connection with a database, a biosignal analysis algorithm, and a separate diagnosis database, and can be diagnosed by objective medical treatment and data statistical processing of doctors using the database. Digital stethoscope system can be implemented by using USB.

What has been described above is only one embodiment for the USB digital stethoscope according to the present invention, the present invention is not limited to the above-described embodiment, as the claims of the following claims deviate from the gist of the present invention Without departing from the scope of the present invention, those skilled in the art will have the technical spirit of the present invention to the extent that various modifications can be made.

As described above, the present invention provides an effect that can overcome the physical pain caused to the user when using a conventional analog stethoscope.

In addition, since the chest sound can be seen and heard between the patient and the guardian at the time of examination, an objective treatment is provided.

In addition, the clinical data and prescriptions based on the thorax database and diagnostic software are issued at the time of diagnosis, thereby providing a reliable diagnosis.

In addition, the chest sound database can be shared among doctors, thus improving the quality of medical care.

In addition, it provides an effect that can be provided as a variety of information on the post-care and treatment of the patient.

Claims (12)

In the digital stethoscope, An input unit configured to collect a bio signal generated in a human body and convert the bio signal into an electrical signal; A first amplifier for amplifying the electroacoustic signal; An ultra low pass filter for passing a signal of a predetermined frequency band among the amplified electroacoustic signals; A second amplifier for amplifying the biosignal output through the ultra low pass filter; An audio unit unit for removing noise by passing only the signal of a predetermined frequency band through the amplified biosignal as described above; Control unit consisting of; And an output unit comprising an earphone or a speaker for outputting the signal output through the audio unit as a sound signal. In the digital stethoscope, An input unit configured to collect a bio signal generated in a human body and convert the bio signal into an electrical signal; A first amplifier for amplifying the electroacoustic signal; An ultra low pass filter for passing a signal of a predetermined frequency band among the amplified electroacoustic signals; A signal input interface for transmitting the biosignal output through the ultra low pass filter to an automatic gain controller; An automatic gain adjuster for maintaining or controlling a biosignal transmitted through the signal input interface in a state close to an original signal; A sample & holder circuit for sampling or holding a signal output from the auto gain controller; An A / D converter converting the sampled or honed analog signal into a digital signal; A digital signal processor for encoding / decoding, signal compression and decompression functions; A D / A converter converting an output of the digital signal processor into an analog signal and outputting the analog signal; A signal adjusting volume group for controlling an amplitude of the output of the D / A converter; Control unit consisting of; An audio output unit configured to output an output of the signal adjusting volume unit as an audio signal; USBI digital stethoscope, characterized in that consisting of.  In the digital stethoscope,  An input unit configured to collect a bio signal generated in a human body and convert the bio signal into an electrical signal;  A first amplifier for amplifying the electroacoustic signal; An ultra low pass filter for passing a signal of a predetermined frequency band among the amplified electroacoustic signals; A signal input interface for transmitting the biosignal output through the ultra low pass filter to an automatic gain controller; An automatic gain adjuster for maintaining or controlling a biosignal transmitted through the signal input interface in a state close to an original signal; A sample & holder circuit for sampling or holding the signal output from the auto gain regulator; An A / D converter converting the sampled or honed analog signal into a digital signal; A digital signal processor for encoding / decoding, signal compression and decompression functions; Control unit consisting of; A USB port for inputting a signal output from the controller to a personal computer in a predetermined form; A personal computer for diagnosing and analyzing a signal input through the USB port by a predetermined algorithm; Output portion consisting of; USBI digital stethoscope, characterized in that consisting of. In the digital stethoscope, A sound collecting unit having a function of collecting a biological signal generated from a human body and transmitting the collected biological signal to a controller; A controller having a function of amplifying, filtering, converting, and controlling a signal received from the sound collecting unit and transmitting the filtered signal to a output unit; And an output unit having a function capable of displaying a signal output from the control unit or diagnosing and analyzing the signal by a predetermined algorithm. The method according to claim 1, The ultra-low pass filter is set to 1.0KHz, and the frequency of the sampling circuit is set to 2.0KHz or more. The method according to claim 1, The audio unit unit detects a chest sound from an amplifier; And a π filter & inverse L-type filter for removing noise by passing only a signal having a predetermined frequency band from the signal output from the signal detection circuit. The method according to claim 2, The voice output unit is a digital stethoscope using a USB, characterized in that the earphone or speaker. The method according to claim 3, And a signal transmission type for inputting and outputting a signal through any one of DOWN STREEM, UP STREEM, 16BIT MONO STREEM, and 24BIT STREO STREEM. The method according to claim 3, The personal computer connected to the USB port is capable of collecting and collectively managing a chest sound signal by receiving any one or more of blood pressure, body temperature, estuary or oxygen saturation (SpO ₂ ), which are biological signals, through the sound collector. USB Digital Stethoscope. The method according to claim 3, A hanning window unit for generating necessary data by using a chest sound signal on the personal computer; And a fast Fourier transform unit and an algebraic energy crossing rate calculation unit for diagnosing or analyzing a biosignal. The method of claim 10, And a biosignal diagnosis algorithm (LCR algorithm) included in the rapid Fourier transform unit and the logarithmic energy crossover calculation unit. The method according to claim 3 or 11, The monitor of the personal computer is a digital stethoscope using a USB screen, characterized in that the touch screen.

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