hello and welcome to the translatorscafe.comchannel! in this video i will show you how to record the sound of your heart using astethoscope and a microphone connected to it. ok, first, the obligatory disclaimer. of course i am not a doctor and cannot give any medicaladvice. the device shown here cannot be used for any diagnostic purposes. of course, onlymedical professionals can listen to the heart sounds and make diagnoses. ordinary mortalslike me cannot do such things. and of course if something goes completely wrong, for example,the mains voltage appears on the stethoscope head or microphone and your body appears groundedat this time, this device can kill you. in short, if you are going to repeat these experiments,you have to know what you are doing.
recording heart sounds is relatively easy.you will need a good microphone capable of recording low frequencies, an inexpensivestethoscope, a recording device and headphones. it is also possible use a piezoelectric buzzeror transducer as a contact microphone. i took it from an old smoke detector. thestethoscope is not necessary if you will use the contact microphone. i tried both and discovered that the condenser microphonecombined with the stethoscope worked better than the contact microphone.we will attach the microphone to the chest piece of the stethoscope using a short pieceof tube. the bell part of the stethoscope will be used for recording. the diaphragmcan be also used. in ordinary acoustic stethoscope the diaphragm is used to filter low frequencysounds and to emphasize high frequency sounds
at the expense of their amplitude. however,in our case we can use software to amplify various frequencies and to remove some unwantedhigh frequencies. now, some theory. heart sounds are generatedby beating heart, mostly by shutting heart valves, and the flow of blood through theheart. the process of hearing these sounds for diagnostic purposes is called auscultation.in healthy adults there are two main heart sounds that are called first and second heartsound s1 and s2. the first sound is produced when atrioventricular valves (mitral or bicuspid)and tricuspid valve are closed and the second sound is produced when semilunar (aortic andpulmonary) valves are closed. other sounds may be present if a person is not healthy.
to hear heart sounds a stethoscope is pressedto the chest at locations labelled with m (mitral), t (tricuspid), a (aortic), p (pulmonic)and e (erb's point, the best for s2 auscultation). now we will connect the stethoscope head withthe microphone to the recording device. our electronic stethoscope is now ready forrecording my heartbeats. later i will view the waveform of the recorded sound of my heart.it is also possible to view its spectrogram that is a visual representation of the spectrumof frequencies in a sound vs. time. the horizontal axis represents time, the vertical axis representsfrequency and a third dimension indicating the amplitude is represented by the colorof the image. for recording and playing back i will usethinklabs phonocardiography powered by audacity
software that is free and can be downloadedfrom thinklabs.com. we tried to show that it's pretty simpleand inexpensive to record your heart beat sound, to listen and even to view it. thankyou for watching. if you liked this video, please don't forget to subscribe to thetranslatorscafe.com youtube channel! all translatorscafe.com videos are made inenglish and russian. all videos are provided with subtitles in these languages, which allowusing them to study technical english as well as technical russian.