Phonocardiogram

A phonocardiogram (PCG) is an electrocardiogram, but recorded using a microphone that records the sounds of the human heart. It can also be called a digital cardiogram and cardiophonogram. The phenomenon of ECG and PCG belongs to the most important objects of complex physical research of heart rhythm and its changes in various pathological conditions. Many years of efforts by doctors, physicists, and engineers have made it possible to develop a number of models of digital phonocardiographs. The most widespread are the simplest, cheapest and high-frequency models of sound oscillating devices; the simplest models are 63–83 dB, better and higher quality - more than the other 20 dB. The advantage of the latter is the following: they have the largest operating frequency range, provide sound in an exceptional band, which allows you to amplify the sound of your voice to the highest level. A significant reserve of maximum power, simplicity of design and input-output are undeniable arguments when choosing an 80–110 dB device based on a sinusoidal oscillation generator with a frequency grid, variable frequency response and an operating frequency band of 25 + 3 kHz. The model of the FK-40-F4s device with a digital analyzer provides all the necessary parameters characterizing noise intervals and data on the relationship between noise states of sound