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Defines the type of the filter for Parks-McClellan algorithm.
OptimalFIR.cs
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Description |
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rmtBandPass |
Supports all lowpass, highpass, bandpass, bandstop and multiband filters. |
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rmtDifferentiator |
Designs a filter with a +20dB/decade slope and +90 degree phase shift. |
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rmtHilbert |
Designs an allpass filter with a -90 degree phase shift. |
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rmtIntegrator |
Designs a filter with a -20dB/decade slope and a -90 degree phase shift. |
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rmtDoubleDifferentiator |
Designs a filter with a +40dB/decade slope and a +90 degree phase shift. |
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rmtDoubleIntegrator |
Designs a filter with a -40dB/decade slope and a -90 degree phase shift. |
Defines the type of the filter the Parks-McClellan algorithm can create. Althought it is possible to design Double integrators and Double differentiators, these filter types do not have phase shifted as required (Double differentiator requires a 180 degree phase shift), but their amplitude response is correct. A -90 degree phase shift is a delay and a +90 degree shift is possible, because the total filter delay is (n-1)/2, where n is the length of the impulse response. The phase shift is evaluated relatively to the total filter delay. A filter with -90 degrees phase shift can be converted to a filter with a +90 degree phase shift, by scaling all the taps with -1. Inverse Hilbert transformer can be obtained by scaling the Hilbert transformer with -1.
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