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DESCRIPTION JP2005052521

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DESCRIPTION JP2005052521
PROBLEM TO BE SOLVED: To realize a low-cost electronic stethoscope that can sort only heart
sounds and breathing sounds. SOLUTION: A sound from a body is converted into an electric
signal by a microphone 1. Of the electrical signals from the microphone 1, the equalizer 2
selectively enhances the signal in the frequency range corresponding to the heart sound and the
signal in the frequency range corresponding to the respiratory sound, and selectively attenuates
the signals in other frequency ranges. Let The amplifier 3 amplifies the output signal of the
equalizer 2. The headphone 4 converts the output signal of the amplifier 3 into sound. The
respiratory sound mainly consists of frequency components in the range of 200 Hz to 2 kHz
centered on about 1 kHz, and the heart sound mainly consists of frequency components in the
range of 20 Hz to 200 Hz centered on about 100 Hz, these two The frequency characteristic of
the equalizer 2 is set so as to selectively enhance the component and attenuate the other
components. [Selected figure] Figure 1
Electronic stethoscope
[0001]
The present invention relates to an electronic stethoscope, and more particularly to an electronic
stethoscope suitable for auscultation of heart sounds and breathing sounds.
[0002]
A stethoscope is a medical device used by a doctor to listen to sounds from the heart, lungs, etc.
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Since the heart and lungs emit sounds in the frequency range of about 16 Hz to 8 kHz, acoustic
stethoscopes that can efficiently listen to sounds in this range are used. Conventional sound
stethoscopes are structured so that only sounds in narrow areas of the body can be auscultated,
and the doctor actively trains the usage of the stethoscope, so the target sound can be extracted
from the surrounding noise. The ability to distinguish between is said to be about 15 dB higher.
However, the noise in the hospital is increasing, making it difficult for the conventional acoustic
stethoscope to accurately hear heart sounds and the like. Therefore, it has been proposed to
listen to heart sounds and the like with an electronic stethoscope instead of a conventional
acoustic stethoscope, and various types of electronic stethoscopes are known. The following
briefly describes some examples of electronic stethoscopes.
[0003]
The stethoscope disclosed in Patent Document 1 is a medical stethoscope for listening to sounds
in a selected audio frequency band. As shown in FIG. 3 (a), the sound in the audio range
generated by the sound source to be analyzed is transmitted to a mechanical adjustment device
having a resonance box. The resonance frequency is changed by the adjustment knob. When the
resonant box is tuned to a particular spectral portion, input acoustic energy that is within that
spectral portion is selectively transmitted through the regulator. It is transmitted to the
headphones and voltmeter through the microphone and amplifier. The user can listen to the
sound only in the frequency part that is within the sorted spectrum part.
[0004]
The electronic stethoscope disclosed in Patent Document 2 is an electronic stethoscope that
includes a microphone, an amplifier, and headphones and performs digital signal processing. As
shown in FIG. 3 (b), a digital filter that simulates the transfer function of a conventional acoustic
stethoscope is provided. The signal heard from the headphones corresponds to the sound learned
with a regular acoustic stethoscope and is suitable for the doctor's normal use. Since noise is
removed and amplified, it can compensate for the doctor's hearing.
[0005]
The stethoscope disclosed in Patent Document 3 is a device for listening to sounds from a human
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2
heart, a respiratory organ, and a circulator. As shown in FIG. 3 (c), it includes a microphone for
direct contact with the body surface, an adjustable electronic band pass filter, a sound frequency
amplifier, and a speaker for reproducing sound. The electronic band pass filter is freely
adjustable with respect to the center frequency and bandwidth of the passband, at least within
the frequency range 20 Hz to 20 kHz. Japanese Patent Publication No. 44-20952 Japanese
Patent Publication No. 10-504748 Japanese Patent No. 3142876
[0006]
However, conventional electronic stethoscopes have a problem that it is not possible to easily
sort only heart sounds and breathing sounds. Electronic stethoscopes that can be sorted out are
complicated and bulky and expensive, and they can not be handled as easily as acoustic
stethoscopes. An object of the present invention is to solve the above-mentioned conventional
problems and to realize a low-cost electronic stethoscope that can sort only heart sounds and
breathing sounds.
[0007]
In order to solve the above-mentioned problems, in the present invention, an electronic
stethoscope, a microphone for converting sound from the body into an electrical signal, and a
signal of a frequency range corresponding to heart sound among respiratory signals from the
microphone and respiratory sound To selectively boost signals in other frequency ranges and to
selectively attenuate signals in other frequency ranges, an amplifier to amplify the output signal
of the equalizer, and a headphone to convert the output signal of the amplifier to sound Or it was
set as the structure equipped with a speaker.
[0008]
In the present invention, by having the above-mentioned configuration, it is possible to realize an
electronic stethoscope that can sort only heart sounds and breathing sounds at low cost.
[0009]
Hereinafter, the best mode for carrying out the present invention will be described in detail with
reference to FIGS. 1 and 2.
[0010]
The embodiment of the present invention converts sound from the body into an electric signal
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with a microphone, and among electric signals from the microphone, a signal of a frequency
range corresponding to heart sound and a signal of a frequency range corresponding to
respiratory sound are equalizers In this electronic stethoscope, the output signal of the equalizer
is amplified by an amplifier, and the output signal of the amplifier is converted to sound by a
headphone or a speaker.
[0011]
FIG. 1A is a conceptual view of an electronic stethoscope according to an embodiment of the
present invention.
FIG. 1 (b) is an external view of the electronic stethoscope.
In FIGS. 1 (a) and 1 (b), the microphone 1 is means for converting sound from the body into an
electrical signal.
The microphone 1 may be small in size and wide in frequency characteristics and flat.
Condenser microphones and electret microphones are suitable, but others may be used. The
equalizer 2 selectively enhances, among the electrical signals from the microphone 1, a signal in
a frequency range corresponding to heart sounds and a signal in a frequency range
corresponding to respiratory sounds, and selectively attenuates signals in other frequency
ranges. It is a means to The amplifier 3 is a means for amplifying the output signal of the
equalizer 2. The headphones 4 are means for converting the output signal of the amplifier 3 into
sound. The headphones 4 are preferably light and noise-free and have high fidelity.
[0012]
The housing 5 is a case for housing the equalizer 2, the amplifier 3, a battery, and the like. As
shown in FIG. 1 (b), the microphone cord plug and the headphone plug are inserted into the
upper surface of the housing 5. A volume control knob is also provided on the top surface of the
housing 5. It is considered to be convenient when used in a chest pocket such as a shirt.
Structurally, it is possible to miniaturize with a very simple structure. Therefore, it is possible to
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make a portable stethoscope easy to carry. FIG. 1 (c) is a graph showing the frequency
characteristics of the equalizer of the electronic stethoscope in the embodiment of the present
invention.
[0013]
FIG. 2 (a) is a conceptual view of another example of the electronic stethoscope in the
embodiment of the present invention. FIG. 2 (b) is an external view of another example of the
electronic stethoscope. In FIGS. 2A and 2B, the speaker 6 is a means for converting the output
signal of the amplifier 3 into a loud sound so that many people can hear it. The other basic
configuration is the same as the electronic stethoscope of FIG.
[0014]
The operation of the electronic stethoscope in the embodiment of the present invention
configured as described above will be described. As shown in FIGS. 1 (a) and 1 (b), the
microphone 1 converts sound from the body into an electrical signal. Of the electrical signals
from the microphone 1, the equalizer 2 selectively enhances the signal in the frequency range
corresponding to the heart sound and the signal in the frequency range corresponding to the
respiratory sound, and selectively attenuates the signals in other frequency ranges. Let The
amplifier 3 amplifies the output signal of the equalizer 2. The headphone 4 converts the output
signal of the amplifier 3 into sound.
[0015]
As shown in FIG. 1C, the frequency characteristic of the equalizer 2 of the electronic stethoscope
selectively enhances the signal in the frequency range corresponding to the heart sound and the
signal in the frequency range corresponding to the respiratory sound, and other frequencies The
range signal is selectively attenuated. The respiratory sound is mainly composed of frequency
components in the range of 200 Hz to 2 kHz centered on about 1 kHz. Heart sounds are mainly
frequency components in the range of 20 Hz to 200 Hz centered on about 100 Hz. The
frequency characteristics of the equalizer 2 are set to selectively enhance these two components
and attenuate the other components.
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[0016]
Specifically, the frequency characteristic of the equalizer 2 is set such that there is a first peak
between 100 Hz and 200 Hz and a second peak between 800 Hz and 1 kHz. Also, the frequency
characteristic of the equalizer 2 is set so that there is a valley between 200 Hz and 300 Hz.
Depending on the frequency characteristics of the microphone 1, the amplifier 3 and the
headphones 4, it is also possible to compensate with the equalizer 2 so that the overall frequency
characteristics become the target characteristics.
[0017]
Another example of the electronic stethoscope shown in FIG. 2 uses a speaker 6 instead of the
headphones 4. The configuration is suitable for use as a stationary stethoscope, and people other
than the doctor who is to be examined can hear the sound of the stethoscope. In addition, the
output signal of the stethoscope can be easily recorded or transmitted. The power supply in this
case can be used as a battery or an AC power supply.
[0018]
As described above, in the embodiment of the present invention, the electronic stethoscope
converts the sound from the body into an electrical signal with the microphone, and among the
electrical signals from the microphone, it converts the signal in the frequency range
corresponding to the heart sound and the respiratory sound. The signal of the corresponding
frequency range is selectively amplified by the equalizer, the signal of the other frequency range
is selectively attenuated, the output signal of the equalizer is amplified by the amplifier, and the
output signal of the amplifier is sounded by the headphone or the speaker The electronic
stethoscope that can sort only heart sounds and breathing sounds can be realized at low cost.
[0019]
The electronic stethoscope of the present invention is useful as an electronic stethoscope
particularly suitable for auscultation of heart sounds and breathing sounds.
[0020]
A conceptual diagram (a) and an external view (b) of an electronic stethoscope in an embodiment
of the present invention, a graph (c) showing a frequency characteristic of an equalizer, and a
concept of another example of the electronic stethoscope in an embodiment of the present
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invention It is a conceptual diagram of the conventional electronic stethoscope with a figure (a)
and an external view (b).
Explanation of sign
[0021]
1 microphone 2 equalizer 3 amplifier 4 headphone 5 case 6 speaker
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