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Diffstat (limited to 'help/en_US/fir2.xml')
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1 files changed, 1 insertions, 49 deletions
diff --git a/help/en_US/fir2.xml b/help/en_US/fir2.xml index 932c474..14a4ecf 100644 --- a/help/en_US/fir2.xml +++ b/help/en_US/fir2.xml @@ -17,55 +17,7 @@ <refnamediv> <refname>fir2</refname> - <refpurpose>Produce an order N FIR filter with arbitrary frequency response M over frequency bands F, returning the N+1 filter coefficients in B.</refpurpose> + <refpurpose></refpurpose> </refnamediv> - -<refsynopsisdiv> - <title>Calling Sequence</title> - <synopsis> - B = fir2(N, F, M) - B = fir2(N, F, M, GRID_N) - B = fir1(N, F, M, GRID_N, RAMP_N) - B = fir1(N, F, M, GRID_N, RAMP_N, WINDOW) - </synopsis> -</refsynopsisdiv> - -<refsection> - <title>Parameters</title> - <variablelist> - <varlistentry><term>N:</term> - <listitem><para> Integer</para></listitem></varlistentry> - <varlistentry><term>F, M:</term> - <listitem><para> Vector</para></listitem></varlistentry> - </variablelist> -</refsection> - -<refsection> - <title>Description</title> - <para> -Produce an order N FIR filter with arbitrary frequency response M over frequency bands F, returning the N+1 filter coefficients in B. The vector F specifies the frequency band edges of the filter response and M specifies the magnitude response at each frequency. - </para> - <para> -The vector F must be nondecreasing over the range [0,1], and the first and last elements must be 0 and 1, respectively. A discontinuous jump in the frequency response can be specified by duplicating a band edge in F with different values in M. - </para> - <para> -The resolution over which the frequency response is evaluated can be controlled with the GRID_N argument. The default is 512 or the next larger power of 2 greater than the filter length. - </para> - <para> -The band transition width for discontinuities can be controlled with the RAMP_N argument. The default is GRID_N/25. Larger values will result in wider band transitions but better stopband rejection. - </para> - <para> -An optional shaping WINDOW can be given as a vector with length N+1. If not specified, a Hamming window of length N+1 is used. -</para> -</refsection> - -<refsection> - <title>Examples</title> - <programlisting role="example"><![CDATA[ -fir2 (10, [0, 0.5, 1], [1, 2, 3]) -ans = --0.00130 0.00000 -0.01792 0.00000 -0.36968 2.00000 -0.36968 0.00000 -0.01792 0.00000 -0.00130 - ]]></programlisting> -</refsection> </refentry> |