Difference between revisions of "Contributions:DiffFilter"

From BCI2000 Wiki
Jump to: navigation, search
 
(DivideByDeltaTime)
Line 22: Line 22:
 
===DivideByDeltaTime===
 
===DivideByDeltaTime===
  
Select whether to return raw sample-to-sample numerical deltas in seconds,  or to divide these by the time delta to approximate a true derivative.
+
Select whether to return raw sample-to-sample numerical deltas,  or to divide these by the time delta in seconds to approximate a true derivative.
 
 
  
 
==States==
 
==States==

Revision as of 01:13, 27 March 2012

Synopsis

Take the derivative of a continuous time-series input wrt. time

Location

http://www.bci2000.org/svn/trunk/src/contrib/SignalProcessing/HilbertSignalProcessing/DiffFilter.cpp

Versioning

Authors

Jeremy Hill

Parameters

DiffOrder

0 = disable; 1 = first derivative; 2 = second derivative; etc

UnwrapDiff

Base at which to unwrap numerical deltas. 2*pi ( = 6.283185307179586232) is a useful base to take in order to unwrap phase differences (when unwrapped at 2*pi, the first derivative of HilbertFilter output when OutputSignal=2 yields instantaneous frequency * 2 * pi).

DivideByDeltaTime

Select whether to return raw sample-to-sample numerical deltas, or to divide these by the time delta in seconds to approximate a true derivative.

States

None.

See also

User Reference:Filters, Contributions:SignalProcessing, Contributions:HilbertSignalProcessing