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System object: dsp.BiquadFilter
Package: dsp

Filter input with biquad filter object


Y = step(biquad,X)
Y = step(biquad,X,NUM,DEN)
Y = step(biquad,X,NUM,DEN,G)



Starting in R2016b, instead of using the step method to perform the operation defined by the System object™, you can call the object with arguments, as if it were a function. For example, y = step(obj,x) and y = obj(x) perform equivalent operations.

Y = step(biquad,X) filters the real or complex input signal X , and outputs the filtered values, Y. The biquad filter object filters each channel of the input signal over successive calls to the step method.

Y = step(biquad,X,NUM,DEN) filters the input using NUM as the numerator coefficients, and DEN as the denominator coefficients of the biquad filter. NUM must be a 3-by-N numeric matrix and DEN must be a 2-by-N numeric matrix, where N is the number of biquad filter sections. The object assumes that the first denominator coefficient of each section is 1. This configuration applies when the SOSMatrixSource property is Input port and the ScaleValuesInputPort property is false.

Y = step(biquad,X,NUM,DEN,G) specifies the scale values, G, of the biquad filter. G must be a 1-by-(N +1) numeric vector, where N is the number of biquad filter sections. This configuration applies when the SOSMatrixSource property is Input Port and the ScaleValuesInputPort property is true.


obj specifies the System object on which to run this step method.

The object performs an initialization the first time the step method is executed. This initialization locks nontunable properties (MATLAB) and input specifications, such as dimensions, complexity, and data type of the input data. If you change a nontunable property or an input specification, the System object issues an error. To change nontunable properties or inputs, you must first call the release method to unlock the object.

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