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biquad − Biquad IIR filter |
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loadrt biquad [count=N] |
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Biquad IIR filter. Implements the following transfer function: H(z) = (n0 + n1z-1 + n2z-2) / (1+ d1z-1 + d2z-2) |
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biquad.N (uses floating-point) |
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biquad.N.in float in |
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Filter input. |
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biquad.N.out float out |
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Filter output. |
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biquad.N.enable bit in (default: 0) |
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Filter enable. When false, the in is passed to out without any filtering. A transition from false to true causes filter coefficients to be calculated according to parameters |
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biquad.N.valid bit out (default: 0) |
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When false, indicates an error occured when caclulating filter coefficients. |
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biquad.N.type u32 rw (default: 0) |
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Filter type determines the type of filter coefficients calculated. When 0, coefficients must be loaded directly. When 1, a low pass filter is created. When 2, a notch filter is created. |
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biquad.N.f0 float rw (default: 250.0) |
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The corner frequency of the filter. |
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biquad.N.Q float rw (default: 0.7071) |
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The Q of the filter. |
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biquad.N.d1 float rw (default: 0.0) |
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1st-delayed denominator coef |
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biquad.N.d2 float rw (default: 0.0) |
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2nd-delayed denominator coef |
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biquad.N.n0 float rw (default: 1.0) |
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non-delayed numerator coef |
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biquad.N.n1 float rw (default: 0.0) |
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1st-delayed numerator coef |
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biquad.N.n2 float rw (default: 0.0) |
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2nd-delayed numerator coef |
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biquad.N.s1 float rw (default: 0.0) |
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biquad.N.s2 float rw (default: 0.0) |
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GPL |