dfilt.df1tsos
Discrete-time, second-order section, direct-form I transposed filter
Syntax
Hd = dfilt.df1tsos(s)
Hd = dfilt.df1tsos(b1,a1,b2,a2,...)
Hd = dfilt.df1tsos(...,g)
Hd = dfilt.df1tsos
Description
Hd = dfilt.df1tsos(s)
returns a
discrete-time, second-order section, direct-form I, transposed filter,
Hd
, with coefficients given in the s
matrix.
The filter states for this object are stored in a filtstates
object.
Hd = dfilt.df1tsos(b1,a1,b2,a2,...)
returns a discrete-time, second-order section, direct-form I, transposed filter,
Hd
, with coefficients for the first section given in the
b1
and a1
vectors, for the second section
given in the b2
and a2
vectors, etc.
Hd = dfilt.df1tsos(...,g)
includes a
gain vector g
. The elements of g
are the gains for
each section. The maximum length of g
is the number of sections plus
one. If g
is not specified, all gains default to one.
Hd = dfilt.df1tsos
returns a
default, discrete-time, second-order section, direct-form I, transposed filter,
Hd
. This filter passes the input through to the output
unchanged.
Note
The leading coefficient of the denominator a(1)
cannot be 0.
To display the filter states, use this code to access the
filtstates
object.
Hs = Hd.states % Where Hd is the dfilt.df1 object and double (Hs) % Hs is the filtstates object
The matrix is
Examples
Specify a second-order sections, direct-form I, transposed discrete-time filter with coefficients from a sixth order, lowpass, elliptical filter using the following code:
[z,p,k] = ellip(6,1,60,.4); % Obtain filter coefficients [s,g] = zp2sos(z,p,k); % Convert to SOS Hd = dfilt.df1tsos(s,g)
Version History
Introduced before R2006a