C# Class NAudio.Dsp.BiQuadFilter

BiQuad filter

Public Methods

Method	Description
AllPassFilter ( float sampleRate, float centreFrequency, float q ) : BiQuadFilter	H(s) = (s^2 - s/Q + 1) / (s^2 + s/Q + 1)
BandPassFilterConstantPeakGain ( float sampleRate, float centreFrequency, float q ) : BiQuadFilter	H(s) = (s/Q) / (s^2 + s/Q + 1) (constant 0 dB peak gain)
BandPassFilterConstantSkirtGain ( float sampleRate, float centreFrequency, float q ) : BiQuadFilter	H(s) = s / (s^2 + s/Q + 1) (constant skirt gain, peak gain = Q)
HighPassFilter ( float sampleRate, float cutoffFrequency, float q ) : BiQuadFilter	H(s) = s^2 / (s^2 + s/Q + 1)
HighShelf ( float sampleRate, float cutoffFrequency, float shelfSlope, float dbGain ) : BiQuadFilter	H(s) = A * (As^2 + (sqrt(A)/Q)s + 1)/(s^2 + (sqrt(A)/Q)*s + A)
LowPassFilter ( float sampleRate, float cutoffFrequency, float q ) : BiQuadFilter	H(s) = 1 / (s^2 + s/Q + 1)
LowShelf ( float sampleRate, float cutoffFrequency, float shelfSlope, float dbGain ) : BiQuadFilter	H(s) = A * (s^2 + (sqrt(A)/Q)s + A)/(As^2 + (sqrt(A)/Q)*s + 1)
NotchFilter ( float sampleRate, float centreFrequency, float q ) : BiQuadFilter	H(s) = (s^2 + 1) / (s^2 + s/Q + 1)
PeakingEQ ( float sampleRate, float centreFrequency, float q, float dbGain ) : BiQuadFilter	H(s) = (s^2 + s(A/Q) + 1) / (s^2 + s/(AQ) + 1)
Transform ( float inSample ) : float	Passes a single sample through the filter

Method	Description
BiQuadFilter ( double a0, double a1, double a2, double b0, double b1, double b2 ) : System

H(s) = (s^2 - s/Q + 1) / (s^2 + s/Q + 1)

public static AllPassFilter ( float sampleRate, float centreFrequency, float q ) : BiQuadFilter
sampleRate	float
centreFrequency	float
q	float
return	BiQuadFilter

H(s) = (s/Q) / (s^2 + s/Q + 1) (constant 0 dB peak gain)

public static BandPassFilterConstantPeakGain ( float sampleRate, float centreFrequency, float q ) : BiQuadFilter
sampleRate	float
centreFrequency	float
q	float
return	BiQuadFilter

H(s) = s / (s^2 + s/Q + 1) (constant skirt gain, peak gain = Q)

public static BandPassFilterConstantSkirtGain ( float sampleRate, float centreFrequency, float q ) : BiQuadFilter
sampleRate	float
centreFrequency	float
q	float
return	BiQuadFilter

H(s) = s^2 / (s^2 + s/Q + 1)

public static HighPassFilter ( float sampleRate, float cutoffFrequency, float q ) : BiQuadFilter
sampleRate	float
cutoffFrequency	float
q	float
return	BiQuadFilter

H(s) = A * (A*s^2 + (sqrt(A)/Q)*s + 1)/(s^2 + (sqrt(A)/Q)*s + A)

public static HighShelf ( float sampleRate, float cutoffFrequency, float shelfSlope, float dbGain ) : BiQuadFilter
sampleRate	float
cutoffFrequency	float
shelfSlope	float
dbGain	float
return	BiQuadFilter

H(s) = 1 / (s^2 + s/Q + 1)

public static LowPassFilter ( float sampleRate, float cutoffFrequency, float q ) : BiQuadFilter
sampleRate	float
cutoffFrequency	float
q	float
return	BiQuadFilter

H(s) = A * (s^2 + (sqrt(A)/Q)*s + A)/(A*s^2 + (sqrt(A)/Q)*s + 1)

public static LowShelf ( float sampleRate, float cutoffFrequency, float shelfSlope, float dbGain ) : BiQuadFilter
sampleRate	float
cutoffFrequency	float
shelfSlope	float	a "shelf slope" parameter (for shelving EQ only). /// When S = 1, the shelf slope is as steep as it can be and remain monotonically /// increasing or decreasing gain with frequency. The shelf slope, in dB/octave, /// remains proportional to S for all other values for a fixed f0/Fs and dBgain.
dbGain	float	Gain in decibels
return	BiQuadFilter

H(s) = (s^2 + 1) / (s^2 + s/Q + 1)

public static NotchFilter ( float sampleRate, float centreFrequency, float q ) : BiQuadFilter
sampleRate	float
centreFrequency	float
q	float
return	BiQuadFilter

H(s) = (s^2 + s*(A/Q) + 1) / (s^2 + s/(A*Q) + 1)

public static PeakingEQ ( float sampleRate, float centreFrequency, float q, float dbGain ) : BiQuadFilter
sampleRate	float
centreFrequency	float
q	float
dbGain	float
return	BiQuadFilter

Passes a single sample through the filter

public Transform ( float inSample ) : float
inSample	float	Input sample
return	float