Filter design, complex specification

2015 10 11
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Hi,
I am trying to design a filter using firls (b = firls(n,f,a)), but in my case the 'a' vector is complex. In other words I am specifying both the amplitude and phase of the ideal filter. I am getting a complex filter. However, if I use fir2 instead, I get a real filter.
Is is 'legitimate' to use complex input for firls?
Thanks, Silviu.

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