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Apply biquadratic filter

BIQUAD OutputArray(OUT),InputArray(IN),FilterCoefficientArray(FP)

・The following calculation is performed on all elements of the specified array. (0 <= t < len(IN))
OUT[t]=FP[0]*IN[t]+FP[1]*IN[t-1]+FP[2]*IN[t-2]-FP[3]*OUT[t-1]-FP[4]*OUT[t-2]
・If a 1D array is specified, it will be handled as monaural and if a 2D array is specified, it will be handled as stereo.
・If the array index is negative, use monaural or the value of FP[5..8] for the left channel and FP[9..12] for the right channel.
FP[5..12] value is updated at each execution.
・The filter coefficient array of the main characteristics such as a low-pass filter can be obtained with the BQPARAM command.

Arguments

OutputArray

Array that stores the results of applying the filter

InputArray

Array containing the signals to which the filter is applied

FilterCoefficientArray

Array containing filter coefficient

・The number of elements in the array must be 13 or more.

Example

DIM OD[2,1000],ID[2,1000],FP[13]
BQPARAM FP,#BQLPF,48000,8000,1/SQR(2)
BIQUAD OD,ID,FP