# iirbpc2bpc

Transform IIR complex bandpass filter to IIR complex bandpass filter with different characteristics

## Description

`[`

transform IIR complex bandpass filter to IIR complex bandpass filter with different
characteristics.`Num`

,`Den`

,`AllpassNum`

,`AllpassDen`

] =
iirbpc2bpc(`B`

,`A`

,`Wo`

,`Wt`

)

The `iirbpc2bpc`

function returns the numerator and denominator
vectors, `Num`

and `Den`

, respectively of the
target filter transformed from the complex bandpass prototype by applying a
first-order complex bandpass to complex bandpass frequency transformation. For more
details, see IIR Complex
Bandpass Frequency Transformation.

The function also returns the numerator, `AllpassNum`

, and the
denominator, `AllpassDen`

, of the allpass mapping filter. The
prototype lowpass filter is specified with the numerator `B`

and a
denominator `A`

.

Frequencies must be normalized to be between -1 and 1, with 1 corresponding to half the sample rate.

## Examples

## Input Arguments

## Output Arguments

## More About

## Version History

**Introduced in R2011a**