RTF_GET_TYPE(3) rtfilter library RTF_GET_TYPE(3)NAME
rtf_get_type - Gets the input or output data type of a filter
SYNOPSIS
#include <rtfilter.h>
int rtf_get_type(hfilter filt, int in);
DESCRIPTION
This function returns the data type of the input or output of the filter filt depending on in. If in is zero, then the returned type is the
output data type. If in is non-zero, the function returns the input data type of the filter.
In case of the success, the returned type will be one of the constants (RTF_FLOAT, RTF_DOUBLE, RTF_CFLOAT or RTF_CDOUBLE) defined in the
man page of rtf_create_filter(3).
RETURN VALUE
Returns the requested data type in case of success, -1 otherwise.
SEE ALSO rtf_create_filter(3)EPFL 2010 RTF_GET_TYPE(3)
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RTF_CREATE_FILTER(3) rtfilter library RTF_CREATE_FILTER(3)NAME
rtf_create_filter - Creates a custom filter
SYNOPSIS
#include <rtfilter.h>
hfilter rtf_create_filter(unsigned int nchann, int proctype,
unsigned int num_len, const void *num,
unsigned int denum_len, const void *denum,
int type);
DESCRIPTION
This function creates and initializes a digital linear filter whose the Z-transform is rational and processing nchann channels of a data
type specified by proctype.
The numerator and denominator of the rational expression are specified by respectively two arrays num and denum containing the coefficients
in the ascending order of the 2 polynoms. The number of elements in each arrays is controlled by num_len and enum_len. denum_len is
allowed to be equal to zero as well as denum is allowed to be NULL. In such case, the denominator will be set to 1. The data type of the
values in num and denum are specified by type.
The proctype and type must be one the following constants:
RTF_FLOAT specifies real single precision (float)
RTF_DOUBLE specifies real double precision (double)
RTF_CFLOAT specifies complex single precision (complex float)
RTF_CDOUBLE specifies complex double precision (complex double)
The expected data type of the output of the filter has the same precision as the one specified by proctype and is complex proctype or type
specifies a complex type. Said otherwise:
* If proctype is RTF_FLOAT or RTF_CFLOAT then the output data type will have single precision. Otherwise it will have double precision.
* If proctype or type specifies a complex type, then the output will be complex as well. Otherwise, it will be real.
rtf_create_filter() can be used to use a filter that has been designed somewhere else. In particular, this function can be used directly
with the output of filter design function of MATLAB. In such case, the usual B and A arrays returned by the filter design functions corre-
sponds exactly to respectively num and denum.
RETURN VALUE
Returns the handle to the created filter in case of success, NULL otherwise.
PERFORMANCE CONSIDERATION
See note of rtf_filter(3)SEE ALSO rtf_destroy_filter(3), rtf_init_filter(3), rtf_filter(3)EPFL 2010 RTF_CREATE_FILTER(3)
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