function WUPDYDLO, x,qmf
;+
; NAME:
; 	WUPDYDLO
;
; PURPOSE:
;	This function performs a Lo-Pass Upsampling operation; periodized.
;
; CATEGORY:
;	Wavelets
;
; CALLING SEQUENCE:
;    u = WUPDYDLO(d,f)
;
; INPUTS:
;    x:    A 1-d signal at finer scale.
;    qmf:   quadrature mirror filter
;
; OUTPUTS:
;    y:    A 1-d signal at coarser scale
; EXAMPLE:
;
; SEE  ALSO:
;	wdndydhi, wdndydlo, wupdydhi, wiwtpo, waconv
;
; MODIFICATION HISTORY:
; 	Written by:	Amara Graps		November, 1994
;Translated from MatLab Wavelab routine: updyadlo.m
;-

y =  WICONV(qmf, WUPSMPLE(x) )

;
; Algorithm Source:  WaveLab Version 0.600
; WaveLab WWW site: http://playfair.stanford.edu/ 
; WaveLab Questions? e-mail wavelab@playfair.stanford.edu
;   
    

Return, y 
End 
;***************************************************