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SmileBASIC4 Replica Reference
BQPARAM
Calculate filter coefficients of biquadratic filter

BQPARAM FilterCoefficientArray,FilterType,SamplingFrequency,CutoffFrequency,QValueOrBandwidth[, AmplificationFactor]

Arguments

FilterCoefficientArray

Array to store filter coefficient (length must be 13 or more)

・ [5..12] of the specified array is not changed even if this command is executed.

FilterType

0 #BQAPF All-Pass Filter Only the phase near the cutoff frequency changes
1 #BQLPF Low-Pass Filter Passes below the cutoff frequency
2 #BQHPF High-Pass Filter Passes frequencies above the cutoff frequency
3 #BQBPF Bandpass Filter Passes a specified frequency band centered on the cutoff frequency
4 #BQBSF Bandstop Filter Blocks the specified frequency band centered on the cutoff frequency
5 #BQLSF Low-Shelf Filter Amplifies the frequency below the cutoff frequency with the specified amplification factor
6 #BQHSF High-Shelf Filter Amplifies the frequency above the cutoff frequency with the specified amplification factor
7 #BQPEQ Peaking Equalizer Amplifies a specified frequency band centered on the cutoff frequency with a specified amplification factor

SamplingFrequency

Sampling frequency of input signal

・0 is an error.

CutoffFrequency

Filter cutoff frequency

QValueOrBandwidth

Handle filter types, BPF/BSF/PEQ as bandwidth (unit: octave), and otherwise, QValue as smoothness of filter characteristics.

・0 is an error.

AmplificationFactor

Amplification factor of filter (unit: db). The descriptions must be needed when the filter types, #BQLSF, #BQHSF and #BQPEQ, are used.

Example

DIM OD[1000],ID[1000],FP[13]
BQPARAM FP,#BQLSF,48000,8000,1/SQR(2),3.0
BIQUAD OD,ID,FP
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June 3, 2020
by mim
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