Nonlinear-Phase Maximally-Flat Lowpass 
	               FIR Filter Design

             Ivan W. Selesnick and C. Sidney Burrus

    Department of Electrical and Computer Engineering - MS 366 
   Rice University, 6100 Main St., Houston, TX 77005-1892, USA 
           selesi@ece.rice.edu, csb@ece.rice.edu 

        
This paper reports a new analytic technique for the design of 
nonlinear-phase maximally-flat lowpass FIR filters.  By subjecting 
the response magnitude and the group delay (individually) to 
differing numbers of flatness constraints, a new family of filters 
is obtained.  With these filters, the delay can be reduced while
maintaining relatively constant group delay in the passband, 
without significantly altering the response magnitude.