|LEVEL 0| |HOMEPAGE| |
OF CARDIOVASCULAR DATA |
|
|LEVEL 0| |HOMEPAGE| |
OF CARDIOVASCULAR DATA |
System that separates specific components of a time series.
Filters are classified according to their passband (i.e., the
frequency range over which the spectral power of the input signal is passed
to the filter output with approximately unity gain) and stopband
(i.e., the frequency range where the power of the input signal is
attenuated to a level which can be considered virtually absent in the output
signal). In the transition band between these two bands, there is
a frequency at which the power of the output signal is half the power of
the input signal: this frequency is called cut-off frequency.
There are four basic types of filters. The low-pass filters
pass low-frequency components to the output while attenuating high frequency
components, and the opposite is true for high-pass filters. The
bandpass
filters reject high- and low- frequency components while passing an intermediate
range, and the bandstop filters reject an intermediate band only.
