b12a49542a
Add interface to query coefficients from chain
2014-07-07 14:56:25 +00:00
a08f846437
Split filtering/coefficient handling files
...
Splits the code for handling coefficient objects and handling filter objects
into separate files. This is just to aid documentation and comprehension.
2014-07-07 11:50:09 +00:00
1cf13be442
Update copyright dates
2014-07-07 11:10:28 +00:00
2ceb582a30
Move doxygen docs into subsection for partioning
2014-07-07 11:07:05 +00:00
8a763c4bf3
Bump C library minor soversion
2014-07-07 11:03:30 +00:00
197446db5f
Add iir_coeff_copy()
2014-07-07 09:56:28 +00:00
a57e239d10
Mark array parameters to iir_coeff_new() as const
2014-07-07 09:46:23 +00:00
Laurence Withers
628e1d55a2
Add coefficient query functions
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Add some functions that allow the opaque struct iir_coeff_t to be queried
in order to retrieve the number and value of the filter coefficients.
2014-07-05 11:12:42 +00:00
Laurence Withers
77a526388d
Add C++ include guards
2014-07-05 11:05:34 +00:00
7dc73bee8a
Bump version
2012-03-16 10:56:19 +00:00
26456a3080
Butterworth: use 2nd order components
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When building a high-order Butterworth filter, split into 2nd-order
components, not 4th-order. Instability due to quantization effects has been
observed on real data even with double-precision floating point.
2012-03-16 10:55:21 +00:00
00b6427cca
Build system update: ignore script file
2012-03-16 10:55:18 +00:00
Laurence Withers
6207c12f14
Bump version
2011-04-15 19:12:32 +00:00
Laurence Withers
e9f55c89ee
Bump version
2011-04-15 19:12:32 +00:00
Laurence Withers
80f79655ca
Copyright/editor line updates
2011-04-15 19:12:04 +00:00
Laurence Withers
ca4b3beb5a
Test program usability fixes
2011-04-15 19:10:21 +00:00
Laurence Withers
e0046bfb84
Add ability to compute filter response
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Adds functionality to compute the response of the filter's transfer function at
a given frequency. This uses the Z domain transform. A new test program
zplot_filter (which is compatible with the existing plot_filter) is provided.
2011-04-15 18:56:19 +00:00
Laurence Withers
4c0680fb02
iir_parse_n(): fix silly bug
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Fixed a silly bug that caused iir_parse_n() to fail for n>1.
2011-04-15 18:05:37 +00:00
Laurence Withers
bc383a92da
iir_filter_copy(): don't copy uninitialised state
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If iir_filter_copy() was called on a filter which had no state, it would copy
the uninitialised memory from that filter. Check for this.
2011-04-15 17:56:48 +00:00
Laurence Withers
9a87889dd3
Improve initial conditions
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Compute the DC gain of the filter (assuming 0 if unstable) and use that to
set the initial conditions of a filter as follows:
x(t<0)=x(0)
y(t<0)=x(0) × dc_gain
2011-04-15 17:53:44 +00:00
2031d084cc
Bump version
2010-11-08 15:18:39 +00:00
ce36ca9ef5
Import initial work
2010-11-08 15:18:07 +00:00
Laurence Withers
Laurence Withers