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Abstract(s)
As doenças do coração são ainda hoje em dia uma grande causa de morte. A maioria destas doenças podem ser detetadas através da auscultação do som do coração. A auscultação do coração tradicional remonta ao século 19, atualmente na era digital começam a ser desenvolvidos os estetoscópios digitais. Este projeto foi realizado com o objetivo de implementar um estetoscópio digital. Para isso foi realizado o estudo do mercado e das tecnologias utilizadas em projetos semelhantes. Estudou-se também os vários tipos de sensores utilizados para adquirir os sons do coração. O protótipo funcional realizado contempla 2 filtros analógicos. Um que permite limitar as frequências para adquirir o som do coração e pulmões e outro que limita apenas aos sons do coração. Para a digitalização foi utilizado um micro-controlador que posteriormente estimula uma coluna e envia o sinal amostrado para o Matlab. O protótipo permite a seleção do filtro analógico a aplicar e permite a amplificação do som aplicado `a coluna com recurso de um amplificador de áudio. A implementação em software faz uso de um sistema em tempo real permitindo a execução das tarefas no tempo necessário e permitindo de futuro um escalonamento superior.
Heart diseases are still, nowadays, a major cause of death. Most of these diseases can be detected through the auscultation of the heart sound. The auscultation of the heart goes back to the 19th century, digital stethoscopes are now being developed in the digital era. This project was carried out with the objective of implementing a digital stethoscope. In this way, a study of the market and of the technologies used in similar projects was undergone. The various types of sensors used to acquire the sounds of the heart were also studied. The functional prototype implemented includes 2 analogue filters. One that allows you to limit the frequencies to get the sound of the heart and lungs and another that limits only it to the sound of the heart. A micro-controller was used for the digital acquisition, which then stimulates a speaker and sends the sampled signal to Matlab. The prototype allows selection of the analogue filter to be applied and allows amplification of the sound applied to the speaker with the use of an audio amplifier. The software implementation makes use of a real-time system allowing the performance of the tasks in the necessary time and allowing a future higher scheduling.
Heart diseases are still, nowadays, a major cause of death. Most of these diseases can be detected through the auscultation of the heart sound. The auscultation of the heart goes back to the 19th century, digital stethoscopes are now being developed in the digital era. This project was carried out with the objective of implementing a digital stethoscope. In this way, a study of the market and of the technologies used in similar projects was undergone. The various types of sensors used to acquire the sounds of the heart were also studied. The functional prototype implemented includes 2 analogue filters. One that allows you to limit the frequencies to get the sound of the heart and lungs and another that limits only it to the sound of the heart. A micro-controller was used for the digital acquisition, which then stimulates a speaker and sends the sampled signal to Matlab. The prototype allows selection of the analogue filter to be applied and allows amplification of the sound applied to the speaker with the use of an audio amplifier. The software implementation makes use of a real-time system allowing the performance of the tasks in the necessary time and allowing a future higher scheduling.
Description
Keywords
Som do coração Estetoscópio Digital Filtros analógicos Micro-controlador Sistema em tempo real Heart sound Digital stethoscope Analog filters Micro-controller Real time system