double
Cast fixed-point filter to use double-precision arithmetic
Syntax
hd = double(h)
Description
hd = double(h)
returns
a new filter hd
that has the same structure and
coefficients as h
, but whose arithmetic property
is set to double
to use double-precision arithmetic
for filtering. double(h)
is not the same as the reffilter(h)
function:
hd
, the filter returned bydouble
has the quantized coefficients ofh
represented in double-precision floating-point formatThe reference filter returned by
reffilter
has double-precision, floating-point coefficients that have not been quantized.
You might find double(h)
useful to isolate
the effects of quantizing the coefficients of a filter by using double
to
create a filter hd
that operates in double-precision
but uses the quantized filter coefficients.
Examples
Version History
Introduced in R2011a