KR20010073855A - An amplifier circuit for the electronic stethoscope - Google Patents
An amplifier circuit for the electronic stethoscope Download PDFInfo
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- KR20010073855A KR20010073855A KR1020000003003A KR20000003003A KR20010073855A KR 20010073855 A KR20010073855 A KR 20010073855A KR 1020000003003 A KR1020000003003 A KR 1020000003003A KR 20000003003 A KR20000003003 A KR 20000003003A KR 20010073855 A KR20010073855 A KR 20010073855A
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- amplifier
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- 230000005236 sound signal Effects 0.000 claims abstract description 21
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 230000003321 amplification Effects 0.000 abstract description 2
- 238000003199 nucleic acid amplification method Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 208000037656 Respiratory Sounds Diseases 0.000 description 3
- 230000003187 abdominal effect Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 238000003745 diagnosis Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000002555 auscultation Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S30/00—Structural details of PV modules other than those related to light conversion
- H02S30/20—Collapsible or foldable PV modules
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
- H01L31/042—PV modules or arrays of single PV cells
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S20/00—Supporting structures for PV modules
- H02S20/30—Supporting structures being movable or adjustable, e.g. for angle adjustment
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Abstract
Description
본 발명은 기존의 일반 청진기를 대체할 수 있는 전자청진기용 증폭기 회로에 관한 것으로서, 청진음을 검출하여 증폭한 후 청취 및 녹음이 가능하고, 디지털로 변환하면 컴퓨터에서 분석 및 저장도 가능한 전자청진기용 증폭기 회로(An amplifier circuit for the electronic stethoscope)에 관한 것이다.The present invention relates to an amplifier circuit for an electronic stethoscope, which can replace a conventional stethoscope, which can detect and amplify a stethoscope sound, listen to and record it, and convert it to a digital device for an electronic stethoscope that can be analyzed and stored. An amplifier circuit for the electronic stethoscope.
종래의 청진기는 저장 및 기록이 불가능하므로 진료에서 임상의사가 순간적으로 들은 후 진단하고, 다음 진료 때에는 의사가 환자의 이전 상태를 기억하지 못하므로 객관적이고 정확한 진단을 내리지 못하는 경우도 있다.Conventional stethoscopes can not be stored and recorded, so the clinician listens to the diagnosis in a few minutes and diagnoses them. At the next treatment, the doctor can not make an objective and accurate diagnosis because the patient does not remember the previous state.
또한 청진음 소리도 전자 청진기에 비해 작게 들리므로 호흡소리와 같은 작은 소리는 듣지 못하여 진료에 어려움이 있다.In addition, since the sound of the stethoscope sounds smaller than the electronic stethoscope, it is difficult to hear the small sounds such as breathing sounds.
그러나 청진기를 현대의 전자회로를 이용하여 구현하면 소리도 크게 들리고 녹음이 가능하고 또한 나중에 디지털로 변환하여 PC에 저장하고 분석할 수도 있을 것이다. 따라서 임상의사의 경험적 지식에만 의존하던 기존 청진기보다 본 발명에서 제시하는 전자 청진기가 널리 활용되면 다양한 기능을 추가하여 청진법의 개선을 기대할 수 있을 것이다.However, if the stethoscope is implemented using modern electronic circuits, the sound can be heard loudly, recorded, and later converted to digital for storage and analysis on a PC. Therefore, if the electronic stethoscope presented in the present invention is widely used than the conventional stethoscope, which was only dependent on the clinician's empirical knowledge, it would be expected to improve the stethoscope method by adding various functions.
본 발명은 상기와 같은 목적을 이루고자 하기 위한 것으로, 가장 기본적인 의료도구인 청진기를 대체할 수 있고 휴대가 간편하게 건전지를 사용하여 저전압 단일 전원으로 구동되는 전자청진기용 증폭기 회로를 제공하는데 그 목적이 있다.An object of the present invention is to provide an amplifier circuit for an electronic stethoscope that can be replaced by a stethoscope, which is the most basic medical tool, and is easily driven by a low voltage single power source using a battery.
본 발명의 목적을 달성하기 위한 기술사상으로서, 음향신호를 검출하여 전기적인 신호로 바꿔주는 마이크로폰 회로부와, 상기 마이크로폰 회로부로부터 나오는 작은 음향신호를 증폭하고 전원잡음을 제거하기 위한 전단증폭부와, 상기 전단증폭부에 의해 증폭된 음향신호에 포함된 피부접촉으로 인한 마찰 잡음과 고주파 잡음을 제거하기 위한 능동 저역통과 필터부와, 상기 능동 저역통과 필터부를 통과하여 잡음이 제거된 신호의 음향레벨을 조절하는 볼륨조절부와, 상기 볼륨조절부를 거친 신호의 파워를 증폭하기 위한 전력증폭부와, 이어폰으로 듣거나 녹음 및 디지털 변환을 위해 상기 증폭기 회로와 잭으로 연결된 출력부로 구성되는 발명이 제시된다.As a technical idea for achieving the object of the present invention, a microphone circuit unit for detecting an acoustic signal and converting it into an electrical signal, a shear amplifier for amplifying a small sound signal from the microphone circuit unit and removing power noise; An active low pass filter for removing friction noise and high frequency noise due to skin contact included in the acoustic signal amplified by the shear amplifier, and adjusting the sound level of the signal from which the noise is removed through the active low pass filter. The invention includes a volume control unit, a power amplifier for amplifying the power of the signal passed through the volume control unit, and an output unit connected to the amplifier circuit and jack for listening to the earphone or recording and digital conversion.
도 1은 본 발명에 의한 청진음 신호처리 구성 블록도.1 is a block diagram of a stethoscope signal processing configuration according to the present invention.
도 2는 본 발명에 의한 전자청진기용 증폭기 회로도.2 is an amplifier circuit diagram for an electronic stethoscope according to the present invention.
< 도면의 주요 부분에 대한 부호의 설명 ><Description of Symbols for Main Parts of Drawings>
10 : 마이크로폰 회로부 11 : 전단증폭부10: microphone circuit portion 11: shear amplifier
12 : 능동 저역통과 필터부 13 : 볼륨조절부12: active low pass filter unit 13: volume control unit
14 : 전력증폭부 15 : 출력부14: power amplifier 15: output unit
16 : 전원공급부16: power supply
이하에서는 상기의 목적을 달성하기 위한 일 실시예의 구성 및 작용에 대해서 첨부된 도면을 참조하여 설명하고자 한다.Hereinafter, with reference to the accompanying drawings, the configuration and operation of an embodiment for achieving the above object will be described.
도 1은 본 발명에 의한 청진음 신호처리 구성 블록도이다.1 is a block diagram of a stethoscope signal processing configuration according to the present invention.
도 1을 참조하여 설명하면, 본 발명은 청진음 신호를 검출하여 전기적 신호로 바꿔주는 마이크로폰 회로부(10)와, 상기 마이크로폰 회로부(10)로부터 입력된 음향신호를 가변이득으로 증폭하는 전단증폭부(11)와, 상기 전단증폭부(11)에 의해 증폭된 음향신호의 고주파 잡음을 제거하기 위한 능동 저역통과 필터부(12)와, 상기 능동 저역통과 필터부(12)를 통과하여 잡음이 제거된 음향신호의 음향 레벨을 조절하는 볼륨조절부(13)와, 상기 볼륨조절부(13)에 의해 조절된 음향신호를 출력부(15)로 내보내는 전력증폭부(14)로 구성된다.Referring to FIG. 1, the present invention provides a microphone circuit unit 10 for detecting a stethoscope sound signal and converting it into an electrical signal, and a shear amplifier unit for amplifying a sound signal input from the microphone circuit unit 10 with variable gain ( 11) and an active low pass filter 12 for removing high frequency noise of the acoustic signal amplified by the shear amplifier 11 and the active low pass filter 12 to remove noise. Volume control unit 13 for adjusting the sound level of the sound signal, and the power amplifier 14 for outputting the sound signal adjusted by the volume control unit 13 to the output unit 15.
도 2는 본 발명에 의한 전자청진기용 증폭기 회로도이다.2 is an amplifier circuit diagram for an electronic stethoscope according to the present invention.
도 2를 참조하여 설명하면, 본 발명은 음향신호를 검출하여 전기적 신호로 바꿔주는 마이크로폰 회로부(10)와, 상기 마이크로폰 회로부(10)로부터 입력된 음향신호를 가변이득으로 증폭하는 전단증폭부(11)와, 상기 전단증폭부(11)에 의해 증폭된 음향신호의 고주파 잡음을 제거하기 위한 능동 저역통과 필터부(12)와, 상기 능동 저역통과 필터부(12)를 통과하여 잡음이 제거된 음향신호의 음향 레벨을 조절하는 볼륨조절부(13)와, 상기 볼륨조절부(13)에 의해 조절된 음향신호를 출력부(15)로 내보내는 전력증폭부(14)와, 회로에 단일 직류 (+)전원을 공급하는 전원공급부(16)로 구성된다.Referring to FIG. 2, the present invention provides a microphone circuit unit 10 for detecting a sound signal and converting the sound signal into an electrical signal, and a shear amplifier 11 for amplifying the sound signal input from the microphone circuit unit 10 with variable gain. ), And an active low pass filter unit 12 for removing high frequency noise of the acoustic signal amplified by the shear amplifier 11, and a sound removed through the active low pass filter unit 12. A volume control unit 13 for adjusting the sound level of the signal, a power amplifier 14 for outputting the sound signal controlled by the volume control unit 13 to the output unit 15, and a single direct current (+ It is composed of a power supply unit 16 for supplying power.
또한, 상기 능동 저역통과 필터부(12)는 3.21kHz의 차단주파수를 갖는 4차 능동 저역통과 필터로 구성된다.In addition, the active low pass filter unit 12 is composed of a fourth-order active low pass filter having a cutoff frequency of 3.21 kHz.
또한, 마이크로폰 회로부(10)의 발광다이오드는 마이크로폰회로에 일정한 전압을 공급하며, 전원공급부(16)의 전원 스위치가 온 되면 발광다이오드가 온 되어 전원공급 상태를 나타내게 된다.In addition, the light emitting diode of the microphone circuit unit 10 supplies a constant voltage to the microphone circuit. When the power switch of the power supply unit 16 is turned on, the light emitting diode is turned on to indicate a power supply state.
위와 같이 구성된 본 발명의 작동을 상세히 설명하면 다음과 같다.Referring to the operation of the present invention configured as described above in detail.
도 2에 도시된 전자청진기용 증폭기 회로를 중심으로 본 발명을 설명하면 다음과 같다.The present invention will be described with reference to the amplifier circuit for the electronic stethoscope shown in FIG.
우선, 사용자가 전원공급부(16)의 전원 스위치를 온 시키면 전자청진기용 증폭기 회로에 건전지 전원이 공급되어 마이크로폰 회로부(10)가 작동되는데 여기서 상기 마이크로폰 회로부(10)의 마이크로폰은 일렉트릿(electret) 콘덴서 마이크로폰을 사용하여 1.3V∼1.5V의 전원이 공급되어야 작동하므로 3V의 건전지 전원을 공급받아 발광다이오드와 저항으로 구성된 회로에 의해 전압 분배하여 마이크로폰에 약 1.5V의 일정한 전압을 공급하게 된다.First, when the user turns on the power switch of the power supply unit 16, the battery power is supplied to the amplifier circuit for the electronic stethoscope so that the microphone circuit unit 10 is operated, where the microphone of the microphone circuit unit 10 is an electret capacitor. Since it operates only when 1.3V ~ 1.5V power is supplied by using the microphone, it is supplied with 3V battery power to divide the voltage by the circuit composed of LED and resistor to supply constant voltage of about 1.5V to the microphone.
이 때, 소정의 음향신호, 예컨데 환자의 심박음이나 기타 호흡소리, 복부음 등의 체내 음향신호가 상기 마이크로폰 회로부(10)에 입력되면 마이크로폰 회로부 (10)를 통해 전기적인 신호로 바뀌어 가변이득의 전단증폭부(11)로 입력되어 증폭된다.At this time, if a predetermined sound signal, for example, a body sound signal such as a patient's heartbeat or other respiratory sound, an abdominal sound, is input to the microphone circuit unit 10, it is converted into an electrical signal through the microphone circuit unit 10 to provide a variable gain. It is input to the shear amplifier 11 and amplified.
이 때, 상기 전단증폭부(11)의 계측증폭기는 가변이득 저전력 단일전원 공급계측증폭기인 Analog Device 사의 AD627이 사용되며 1kHz에서 입력 전압 잡음은이고, 출력 전압 잡음은로 SNR(Signal-to-Noise Ratio)이 좋고 이득은 약 28dB이다. 또한 상기 전단증폭부(11)가 단일 전원으로 구동되므로 기준 전압(reference voltage)이 필요하다. 이는 저항을 이용한 전압분배회로를 이용하여 공급전압 3V에서 전압 분배하여 AD627의 REF(5번) 핀에 약 1.5V의 기준 전압을 인가해 주게 된다.In this case, the measuring amplifier of the shear amplifier 11 is an analog output AD627 manufactured by a variable gain low power single power supply measuring amplifier. And the output voltage noise is The signal-to-noise ratio (SNR) is good and the gain is about 28dB. In addition, since the shear amplifier 11 is driven by a single power supply, a reference voltage is required. The voltage is divided by the supply voltage 3V using a voltage divider circuit using a resistor to apply a reference voltage of about 1.5V to the REF (No. 5) pin of the AD627.
상기 전단증폭부(11)에서 증폭된 음향신호는 능동 저역통과 필터부(12)에 인가되어 고주파 잡음이 제거된다.The acoustic signal amplified by the shear amplifier 11 is applied to the active low pass filter 12 to remove high frequency noise.
이 때, 상기 능동 저역통과 필터부(12)는 3.21kHz 2차 최대평탄형 필터가 2단으로 구성된 4차 능동 저역통과 필터이고, 상기 능동 저역통과 필터부(12)에 사용된 OP 앰프는 단일전원으로 구동되고, National Semiconductor 사의 LMV358이 사용되며, rail-to-rail 출력 기술이 적용되어 저전압으로 구동되며, CMRR (Common-mode Rejection Ratio)은 60dB이며, 상기 전단증폭부(11)를 지난 신호의 직류전압이 1.5V보다 높아지므로 상기 능동 저역통과 필터부(12)의 입력에서 저항을 이용한 전압분배 회로로 입력 직류전압을 1.5V로 맞추게 된다.In this case, the active low pass filter unit 12 is a fourth-order active low pass filter composed of two stages of the 3.21 kHz second-order maximum flat filter, and the OP amplifier used in the active low pass filter unit 12 is a single unit. It is powered by a power source, National Semiconductor's LMV358 is used, and rail-to-rail output technology is applied to drive the low voltage, the common-mode rejection ratio (CMRR) is 60dB, and the signal past the shear amplifier 11 Since the DC voltage of is higher than 1.5V, the input DC voltage is adjusted to 1.5V by a voltage distribution circuit using a resistor at the input of the active low pass filter unit 12.
음향신호가 상기 능동 저역통과 필터부(12)를 통해 필터링된 후 볼륨조절부 (13)에 의해 음향 레벨이 조절된다.After the sound signal is filtered through the active low pass filter unit 12, the sound level is adjusted by the volume control unit 13.
상기 볼륨조절부(13)에 의해 조절된 음향신호는 전력증폭부(14)에 입력되어 증폭된다.The sound signal adjusted by the volume control unit 13 is input to the power amplifier 14 and amplified.
이 때, 상기 전력증폭부(14)의 오디오 전력증폭기는 삼성전자의 KA2209가 사용되며 2 채널로 이루어져 스테레오 구성이 가능하며, 폐루프 전압이득이 40dB이고, 1kHz에서 THD(Total Harmonic Distortion)이 0.5%이다.At this time, the audio power amplifier of the power amplifier 14 is Samsung KA2209 is used as a two-channel stereo configuration, the closed loop voltage gain is 40dB, THD (Total Harmonic Distortion) is 0.5 at 1kHz %to be.
이 때, 상기 전력증폭부(14)의 출력에서는 기준 전압을 인가함으로써 발생된 오프셋(offset)이 커패시터와 저항이 직렬로 연결된 회로에 의해 제거된다.At this time, at the output of the power amplifier 14, an offset generated by applying a reference voltage is removed by a circuit in which a capacitor and a resistor are connected in series.
상기 전력증폭부(14)에 이어폰 잭 및 라인아웃 잭을 포함하는 출력부(15)가 연결되어 상기 전력증폭부(14)에서 증폭된 음향신호가 출력된다.An output unit 15 including an earphone jack and a line-out jack is connected to the power amplifier 14 to output an amplified sound signal from the power amplifier 14.
이 때, 상기 출력부(15)는 이어폰을 꽂아 음향신호를 청취할 수 있고, 라인아웃 잭에는 녹음기를 연결하여 녹음할 수도 있고 PC와 인터페이스하여 전자청진기용 증폭기 회로로부터 출력된 음향신호를 하드디스크에 저장할 수도 있고 별도의 소프트웨어로 분석할 수도 있다.At this time, the output unit 15 can be connected to the earphone to listen to the sound signal, the line-out jack can be connected to the recorder to record or interface with a PC to output the sound signal output from the amplifier circuit for the electronic stethoscope hard disk You can save it to your computer or analyze it in separate software.
한편, 상기 전원공급부(16)는 1.5V의 AAA 건전지가 직렬로 2개가 연결되어 3V의 전압이 인가되며, 전원 스위치를 통해 전자청진기용 증폭기 회로의 전원공급을 제어한다.On the other hand, the power supply unit 16 is connected to two 1.5V AAA batteries in series, a voltage of 3V is applied, and controls the power supply of the amplifier circuit for the electronic stethoscope through a power switch.
전압이 인가되면 상기 마이크로폰 회로부가 온 되어 청진음 신호가 입력되어 전기적 신호로 바뀐 뒤 상기 전단증폭기로 보내져 증폭된 후 상기 능동 저역통과 필터부를 통해 고주파 잡음이 제거되어 상기 볼륨조절부를 통해 일정 음향레벨로 조절되어 상기 전력증폭부로 보내져 최종적으로 증폭된 뒤 출력부를 통해 이어폰 및 라인 아웃잭으로 연결된다. 이로서 미세한 심박음 및 기타 호흡소리, 복부음 등의 청진음 신호를 검출하여 전자청진기용 증폭기 회로를 통해 증폭하여 기존 청진기보다 더 잘 들리게 청취 및 녹음이 가능하게 되며, 또한 나중에 디지털로 변환하여 PC에 저장하고 분석할 수도 있을 것이다. 따라서 임상의사의 경험적 지식에만 의존하던 기존 청진기보다 본 발명에서 제시하는 전자 청진기가 널리 활용되면 다양한 기능을 추가하여 청진법의 개선을 기대할 수 있을 것이다.When the voltage is applied, the microphone circuit is turned on, a stethoscope signal is inputted, converted into an electrical signal, sent to the shear amplifier, amplified, and the high frequency noise is removed through the active low pass filter to obtain a predetermined sound level. It is regulated and sent to the power amplifier for final amplification and then connected to the earphone and line out jack through the output. This detects the heartbeat and other auscultation signals such as breathing sounds, abdominal sounds, and amplifies them through an amplifier circuit for an electronic stethoscope, so that they can be heard and recorded more easily than conventional stethoscopes. You can also save and analyze it. Therefore, if the electronic stethoscope presented in the present invention is widely used than the conventional stethoscope, which was only dependent on the clinician's empirical knowledge, it would be expected to improve the stethoscope method by adding various functions.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020000003003A KR20010073855A (en) | 2000-01-21 | 2000-01-21 | An amplifier circuit for the electronic stethoscope |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020000003003A KR20010073855A (en) | 2000-01-21 | 2000-01-21 | An amplifier circuit for the electronic stethoscope |
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| KR20010073855A true KR20010073855A (en) | 2001-08-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| KR1020000003003A KR20010073855A (en) | 2000-01-21 | 2000-01-21 | An amplifier circuit for the electronic stethoscope |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030018703A (en) * | 2001-08-31 | 2003-03-06 | 김동준 | Amplifier of the electronic stethoscope for the computer interface |
| WO2003063708A1 (en) * | 2002-01-31 | 2003-08-07 | Gs Technology Co., Ltd. | System for outputting acoustic signal from a stethoscope |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4170717A (en) * | 1977-02-18 | 1979-10-09 | Walshe James C | Electronic stethoscope |
| JPH0551311U (en) * | 1991-12-13 | 1993-07-09 | 誠人 小林 | Stethoscope |
| KR950703891A (en) * | 1992-12-07 | 1995-11-17 | 안드레드 빌러스 | Electronic Stethoscope |
| KR970000080A (en) * | 1995-06-19 | 1997-01-21 | Seasoning seasoning solution and manufacturing method | |
| US5841846A (en) * | 1996-09-16 | 1998-11-24 | American Telecare, Inc. | Digital telephonic system for stethoscope signal processing |
| KR19990085828A (en) * | 1998-05-22 | 1999-12-15 | 이상훈 | Electronic stethoscope |
-
2000
- 2000-01-21 KR KR1020000003003A patent/KR20010073855A/en not_active Application Discontinuation
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4170717A (en) * | 1977-02-18 | 1979-10-09 | Walshe James C | Electronic stethoscope |
| JPH0551311U (en) * | 1991-12-13 | 1993-07-09 | 誠人 小林 | Stethoscope |
| KR950703891A (en) * | 1992-12-07 | 1995-11-17 | 안드레드 빌러스 | Electronic Stethoscope |
| KR970000080A (en) * | 1995-06-19 | 1997-01-21 | Seasoning seasoning solution and manufacturing method | |
| US5841846A (en) * | 1996-09-16 | 1998-11-24 | American Telecare, Inc. | Digital telephonic system for stethoscope signal processing |
| KR19990085828A (en) * | 1998-05-22 | 1999-12-15 | 이상훈 | Electronic stethoscope |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030018703A (en) * | 2001-08-31 | 2003-03-06 | 김동준 | Amplifier of the electronic stethoscope for the computer interface |
| WO2003063708A1 (en) * | 2002-01-31 | 2003-08-07 | Gs Technology Co., Ltd. | System for outputting acoustic signal from a stethoscope |
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