Filters for phono-cardiography
| Autor: | E. Van Vollenhoven, H. Reuver, T. Dorenbos, J. E. W. Beneken |
|---|---|
| Rok vydání: | 1967 |
| Předmět: |
Engineering
business.industry Attenuation Acoustics Phonocardiography General Engineering Biomedical Engineering Filter (signal processing) Computer Science Applications Band-pass filter Electronic engineering Humans Prototype filter Transient response Transient (oscillation) business High-pass filter m-derived filter |
| Zdroj: | Medical & Biological Engineering. 5:127-138 |
| ISSN: | 1741-0444 0025-696X |
| DOI: | 10.1007/bf02474500 |
| Popis: | Investigations and theoretical considerations show that it is impossible to design a filter type that is at the same time ideal for observing short-lasting acoustic phenomena like heart sounds as well as long-lasting acoustic phenomena like murmurs. It is shown that this impossibility is related to the selective properties and transient response of the filters. The use of high-pass filters having a low cut-off frequency, with gradual slopes of attenuation, and high cut-off frequency filters with a steep slope of attenuation, is advocated for phono-cardiography. Recently, cardiologists have expressed interest in the implications of using the various types of filters. In this paper, gain-frequency and transient responses of a number of typical filters are compared. The analytical procedure for obtaining the responses is briefly introduced. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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