n = nstates(hd) returns the number of states n in the discrete-time filter hd. The number of states depends on the filter structure and the coefficients.

Multirate Filters

n = nstates(hm) returns the number of states n in the multirate filter hm. The number of states depends on the filter structure and the coefficients.

Examples

Check the number of states for two different filters, one a direct form FIR filter, the other a multirate filter.

h=firls(30,[0 .1 .2 .5]*2,[1 1 0 0])

hd=dfilt.dffir(h)
 
hd =
 
         FilterStructure: 'Direct-Form FIR'
              Arithmetic: 'double'
               Numerator: [1x31 double]
    PersistentMemory: 'on'
                  States: [30x1 double]

n=nstates(hd)

n =

    30


hm=mfilt.firfracdecim(2,3)
 
hm =
 
         FilterStructure: [1x46 char]
               Numerator: [1x72 double]
       RateChangeFactors: [2 3]
        PersistentMemory: false
                  States: [35x1 double]

n=nstates(hm)

n =

    35

nstates - Number of filter states

Syntax

Description

Discrete-Time Filters

Multirate Filters

Examples

See Also