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_DOWNSAMPLER(3) rtfilter library RTF_CREATE_DOWNSAMPLER(3)NAME
rtf_create_downsampler - Creates downsampling filter
SYNOPSIS
#include <rtfilter.h>
hfilter rtf_create_downsampler(unsigned int nch, int type,
unsigned int r);
DESCRIPTION
rtf_create_downsampler() creates a filter that downsamples signals coming from nch channels of type type (see rtf_create_filter(3)) by a
decimation factor of r (i.e. the sampling frequency of the input will be r times the sampling frequency of the output). This is achieved
internally by applying a lowpass 4-order Chebychev filter to the input data using a normalized cutoff frequency of 0.8/(2*r) and decimating
the result every r samples.
RETURN VALUE
Returns the handle to the created filter in case of success, NULL otherwise.
NOTES
On the contrary of most other filters, the number of samples returned by rtf_filter(3) is different than the input (as expected) but also
may vary at each call if the number of sample supplied in input is not a multiple of r.
SEE ALSO rtf_filter(3), rtf_create_filter(3), rtf_destroy_filter(3)EPFL 2010 RTF_CREATE_DOWNSAMPLER(3)
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