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Frequency Transformations

Transform filters to other forms, use features in a filter to develop another filter

DSP System Toolbox™ offers several functions that transform existing FIR and IIR filters into other forms to achieve different frequency responses. The general idea of frequency transformation is to use an existing prototype filter to produce another filter that retains some characteristics of the prototype filter in the frequency domain. For more information, see Digital Frequency Transformations.


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firlp2hpTransform FIR lowpass filter to Type I FIR highpass filter
firlp2lpTransform FIR Type I lowpass to FIR Type 1 lowpass with inverse bandwidth
iirbpc2bpcTransform IIR complex bandpass filter to IIR complex bandpass filter with different characteristics
iirftransfIIR frequency transformation of digital filter
iirlp2bpTransform IIR lowpass filter to IIR bandpass filter
iirlp2bpcTransform IIR lowpass filter to complex bandpass filter
iirlp2bsTransform IIR lowpass filter to IIR bandstop filter
iirlp2bscTransform IIR lowpass filter to complex bandstop filter
iirlp2hpTransform lowpass IIR filter to highpass filter
iirlp2lpTransform lowpass IIR filter to different lowpass filter
iirlp2mbTransform IIR lowpass filter to IIR multiband filter
iirlp2mbcTransform IIR lowpass filter to IIR complex multiband filter
iirlp2xcTransform IIR lowpass filter to IIR complex N-point filter
iirlp2xnTransform IIR lowpass filter to IIR real N-point filter
iirpowcompPower complementary IIR filter