hjorth

  HJORTH calculates ACTIVITY, MOBILITY, COMPLEXITY
           
  [ACTIVITY, MOBILITY, COMPLEXITY] = hjorth(...)
  
  [...] = hjorth(S,0)
       calculates stationary Hjorth parameter 
  [...] = hjorth(S,UC) with 0<UC<1,
       calculates time-varying Hjorth parameter using 
       exponential window 
  [...] = hjorth(S,N) with N>1,
       calculates time-varying Hjorth parameter using 
       rectangulare window of length N
  [...] = hjorth(S,B,A) with B>=1 oder length(B)>1,
       calulates time-varying Hjorth parameters using 
       transfer function B(z)/A(z) for windowing 

       S       data (each channel is a column)
       UC      update coefficient 
       B,A     filter coefficients (window function) 
              
 see also: TDP, BARLOW, WACKERMANN

 REFERENCE(S):
 [1] B. Hjorth,
   EEG analysis based on time domain properties
   Electroencephalography and Clinical Neurophysiology, vol. 29, no. 3, pp. 306–310, September 1970.
 [2] B. Hjorth,
   Time Domain Descriptors and their Relation to particulare Model for Generation of EEG activity.
   in G. Dolce, H. Kunkel: CEAN Computerized EEG Analysis, Gustav Fischer 1975, S.3-8.