[lo,mo] = euclidfactors(hm) returns integer factors lo and mo such that (lo*L)-(mo*M) = -1. L and M are relatively prime and represent the interpolation and decimation factors of the multirate filter hm.

euclidfactors works with multirate filters that have both decimation and interpolation factors, such as mfilt.firfracdecim, mfilt.firfracinterp, or mfilt.firsrc. You cannot return lo and mo for decimators or interpolators.

Examples

Use an FIR fractional decimator, with L = 5 and M = 7, to show what euclidfactors does.

hm=mfilt.firfracdecim(5,7)
 
hm =
 
 FilterStructure: 'Direct-Form FIR Polyphase Fractional Decimator'
       Numerator: [1x168 double]
RateChangeFactors: [5 7]
 PersistentMemory: false
           States: [62x1 double]

[lo,mo]=euclidfactors(hm)

lo =

     4

mo =

     3

Indeed, (lo*L)-(mo*M) = (4*5)-(3*7) = -1.

euclidfactors - Euclid factors for multirate filter

Syntax

Description

Examples

See Also