D.A. Balakin

The soft ware and hard ware of the special complex for registering and analyzing of natural acoustic noises is described in this article. The developed complex is directed to application in the medical field, where there exist an actual task - to set diagnosis of noises in breathing and to test the capability of breathe function. The hard ware consists of two parts. The first part is a preliminary amplifier. And the second part is a matching device. The preliminary amplifier is used to amplify input signals and to get output differential signals. The preliminary amplifier has a resistive and phase-inverting device. The input signal goes from a microphone. The matching device provides needed amplification and filters the signal. The device consists on an instrumental amplify, which suppress common-mode signal, and on a number of active filters, which pass needed frequency band of noisy signals researched. In the matching device there is a special separate respirator channel for registration and further analysis of breath function. Then output signals go to a personal computer (PC), where they are under processing, registering, recording and analyzing. In while designing it was necessary to develop a cheap and simple complex that is why the sound board.